CN1243597C - Process for removing CO2 from conversion gas by three-stage pressure swing adsorption device - Google Patents

Process for removing CO2 from conversion gas by three-stage pressure swing adsorption device Download PDF

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CN1243597C
CN1243597C CNB2004100216977A CN200410021697A CN1243597C CN 1243597 C CN1243597 C CN 1243597C CN B2004100216977 A CNB2004100216977 A CN B2004100216977A CN 200410021697 A CN200410021697 A CN 200410021697A CN 1243597 C CN1243597 C CN 1243597C
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gas
pressure swing
tower
swing adsorption
carbon dioxide
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CN1557528A (en
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宋宇文
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Chengdu Tianli Chemical Engineering Technology Co Ltd
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Chengdu Tianli Chemical Engineering Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/151Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The present invention relates to a method for removing carbon dioxide from conversion gas by three stages of pressure-swing adsorption devices, which belongs to the field of gas separation of pressure-swing adsorption. The present invention has the technical scheme that conversion gas is eliminated at the first stage and is concentrated into product carbon dioxide; impurities in mixed gas are absorbed by the second stage; part of the carbon dioxide in the mixed gas is then eliminated by the third stage; gas of an outlet of the third stage fully return to the first stage and is used for increasing pressure of an adsorption tower of the first stage; in one cycle period, the adsorption tower of the first stage sequentially has the processing steps of adsorption A, both-end pressure-equalizing pressure decrease 2ED', product carbon dioxide pressure decrease D, three-section gas pressure rise 3ER, both-end pressure-equalizing pressure rise 2ER' and final pressure rise FR; an adsorption tower of the second stage sequentially has the processing steps of adsorption A, pressure-equalizing pressure decrease ED, backward discharging BD, vacuum pumping VC, pressure-equalizing pressure rise ER and final pressure rise FR; an adsorption tower of the third stage sequentially has the processing steps of adsorption A, vacuum pumping VC and pressure rise R. The present invention has the advantages of low power consumption, and high recovery rate of effective gas.

Description

Adopt three stage pressure swing adsorption apparatus from conversion gas, to remove the method for carbon dioxide
One, technical field
The present invention relates to a kind of employing three stage pressure swing adsorption apparatus remove carbon dioxide from conversion gas method, belong to transformation adsorbed gas separation field.
Two, background technology
We know, in the synthetic ammonia urea production process, carbon dioxide in the conversion gas need be purified to more than 98.5% (V), also need the hydrogen in the conversion gas, nitrogen separation are come out simultaneously, carbon dioxide in hydrogen, the nitrogen generally requires less than 0.2% (V), therefore, in fact decarbonizing urea is exactly purifying carbon dioxide and separation of hydrogen, nitrogen from conversion gas.
At present, adopt three stage pressure swing adsorptions to remove the method for carbon dioxide from conversion gas, domestic also do not have disclosed patent documentation and a document announcement.All adopted one section or two-stage pressure swing adsorption apparatus to remove carbon dioxide in the conversion gas in the past, as Chinese patent publication number CN1069708A, CN1146369A, employings such as CN1171285A one stage pressure swing adsorption apparatus removes the carbon dioxide in the conversion gas, this method can not be purified the carbon dioxide in the conversion gas and is used for urea production, mainly be used in liquefied ammonia, join during pure and mild single alcohol etc. produces, and Chinese patent publication number CN1235862A, CN1248482A, employing two-stage pressure swing adsorption apparatus such as CN1357404A remove the carbon dioxide in the conversion gas, this method can be purified the carbon dioxide in the conversion gas and is used for urea production, the rate of recovery of hydrogen is generally 95-98% (rising with adsorptive pressure improves), the rate of recovery of carbon monoxide is generally 80-87% (rising with adsorptive pressure improves), the rate of recovery of nitrogen is generally 85-89% (rising with adsorptive pressure improves), the rate of recovery of carbon dioxide is generally 65-70%, synthetic ammonia power consumption 80-138 degree per ton (rising with adsorptive pressure reduces), this shows, above-mentioned prior art hydrogen, nitrogen, the loss of available gas such as carbon monoxide and carbon dioxide is very big, synthetic ammonia power consumption per ton is very high, has increased the cost of synthetic ammonia greatly.
Adopt three stage pressure swing adsorptions from conversion gas, to remove the method for carbon dioxide, disclosed patent documentation report was once arranged abroad.As United States Patent (USP): U.S.Pat.Nos.5,133, in 785, adopted three sections transformation adsorbed gas isolation technics, first section pressure swing adsorption gas separation device of this patent disclosure is used for purifying carbon dioxide, and product carbon dioxide replacement pressure is adsorptive pressure, because when first section adsorption tower absorption finishes, adsorbents adsorb carbon dioxide in the adsorption tower is unsaturation far away, so product carbon dioxide replacement tolerance is very big, thereby power consumption is risen significantly.Second section pressure swing adsorption gas separation device is used for hydrogen purification to 99.999% (V) that first section pressure swing adsorption gas separation device adsorption tower worked off one's feeling vent one's spleen, remove synthetic ammonia then with after high purity nitrogen mixes, to send into the 3rd section pressure swing adsorption gas separation device after other mist compression except that high-purity hydrogen (99.999% (V)) in second section pressure swing adsorption gas separation device, with the hydrogen upgrading in the gaseous mixture, remove the impurity that adsorbs in second section pressure swing adsorption gas separation device adsorption tower of cleaning and regeneration with carrying dense hydrogen, thereby improve the rate of recovery of hydrogen, vacuumize end back adsorption tower with first section pressure swing adsorption gas separation device after second section pressure swing adsorption gas separation device adsorption tower absorption finishes and carry out drop pressure, first section pressure swing adsorption gas separation device adsorption tower adsorbs with second section corresponding series connection of pressure swing adsorption gas separation device adsorption tower, the adsorption time of the adsorption time of first section pressure swing adsorption gas separation device adsorption tower and sorption cycle time and second section pressure swing adsorption gas separation device adsorption tower and sorption cycle time must be identical, the quantity of first section pressure swing adsorption gas separation device adsorption tower must be the twice of second section pressure swing adsorption gas separation device adsorption tower, this has just limited the optimization of first section and second section pressure swing adsorption gas separation device adsorption tower step widely, and in the industrial design of reality, it is very difficult first section adsorption tower with second section pressure swing adsorption gas separation device will to be designed to identical adsorption time, even the adsorption time of design is identical, when operating condition changed, its adsorption time was also different.The rate of recovery of this patent disclosure hydrogen is generally 92-95% (rising with adsorptive pressure improves), the rate of recovery of carbon dioxide is generally 88-95% (rising with adsorptive pressure improves), synthetic ammonia power consumption 130-240 degree per ton (rising with adsorptive pressure reduces), this shows, the loss of available gas such as this patent disclosure hydrogen and carbon dioxide is very big, synthetic ammonia power consumption per ton is very high, has increased the cost of synthetic ammonia greatly.(adsorptive pressure is less than 1.0Mpa) its overall economic efficiency is not as good as Chinese patent open CN1235862A, CN1248482A and CN1357404A when operating pressure is low pressure.
Three, summary of the invention
It is reasonable to the purpose of this invention is to provide a kind of investment economy, and three sections pressure swing adsorption decarbonization methods that operating cost is very low adopt the combination of different equipment and adsorbent to solve the above-mentioned problems in the prior art.Make it to have the advantage of compared with prior art saving operating cost significantly, reduce the available gas loss of device to greatest extent.
Technical solution of the present invention is as follows:
Adopt the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, remove product carbon dioxide and the (gaseous mixture promptly of working off one's feeling vent one's spleen that enters second section pressure swing adsorption gas separation device in first section pressure swing adsorption gas separation device, down with) all gas in outer all gas and the second section pressure swing adsorption gas separation device except that entering next workshop section's product gas enters the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, the contrary BD of putting, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
After first section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A, increase drop pressure ED and/or first section pressure swing adsorption gas separation device adsorption tower process cycles step two ends drop pressure 2ED ' increases gaseous mixture step-down D1 step afterwards.
After first section pressure swing adsorption gas separation device adsorption tower process cycles step product carbon dioxide step-down D, increase and purge the CP step or vacuumize the VC step.
After second section pressure swing adsorption gas separation device adsorption tower process cycles step drop pressure ED, increase and reclaim the RG step, increase by two sections gas lifts simultaneously and press the 2ER step after first section pressure swing adsorption gas separation device adsorption tower process cycles step 3 section gas lift pressed the 3ER step, above-mentioned second section pressure swing adsorption gas separation device adsorption tower reclaims between RG step and two sections gas lifts pressures of the first section pressure swing adsorption gas separation device adsorption tower 2ER step and is connected by surge tank V1.
After the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, increase drop pressure ED step, after vacuumizing the VC step, increase boost pressure ER step simultaneously.
Increase displacement P step after the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, the adsorption tower of displacement P step is worked off one's feeling vent one's spleen another adsorption tower is boosted, simultaneously with the displacement gas PR step replacement R step of boosting of boosting.
In first section pressure swing adsorption gas separation device adsorption tower process cycles step, when product carbon dioxide step-down D step is carried out, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, put into product carbon dioxide buffer jar V3 again, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment.
In first section pressure swing adsorption gas separation device adsorption tower process cycles step, when product carbon dioxide step-down D step is carried out, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, put into product carbon dioxide buffer jar V3 again, put into gas holder V at last, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment.
The adsorbent of filling is activated alumina and Kiselgel A from down to up in the first stage pressure swing adsorption apparatus adsorption tower, the adsorbent of filling is Kiselgel A or molecular sieve in the second stage pressure swing adsorption apparatus adsorption tower, and the adsorbent of filling is Kiselgel A or activated alumina and Kiselgel A in the 3rd stage pressure swing adsorption apparatus adsorption tower.
First stage pressure swing adsorption apparatus is worked off one's feeling vent one's spleen, and the mean concentration of carbon dioxide is 7~15% (V) in (gaseous mixture promptly, down with), and the mean concentration of carbon dioxide was 30~60% (V) during the 3rd stage pressure swing adsorption apparatus was worked off one's feeling vent one's spleen.
The exit gas of the 3rd stage pressure swing adsorption apparatus adsorption tower when gas concentration lwevel is 0~6% (V), returns first section and second section pressure swing adsorption gas separation device adsorption tower is boosted.
The adsorptive pressure of the 3rd stage pressure swing adsorption apparatus adsorption tower is 0.005~0.01Mpa (gauge pressure).
Adopt the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the working off one's feeling vent one's spleen of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', vacuumize VC, three sections gas lifts are pressed 3ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, the contrary BD of putting, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
Increase gaseous mixture step-down D1 step afterwards at first section pressure swing adsorption gas separation device adsorption tower process cycles step two ends drop pressure 2ED '.
Increase displacement P step after the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, the adsorption tower of displacement P step is worked off one's feeling vent one's spleen another adsorption tower is boosted, simultaneously with the displacement gas PR step replacement R step of boosting of boosting.
Adopt the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the working off one's feeling vent one's spleen of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two sections gas lifts are pressed 2ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, reclaim RG, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
Adopt the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the working off one's feeling vent one's spleen of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', vacuumize VC, three sections gas lifts are pressed 3ER, two sections gas lifts are pressed 2ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, reclaim RG, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
The present invention can bring up to 99.9% to the rate of recovery of hydrogen, carbon dioxide and nitrogen, the rate of recovery of carbon monoxide brings up to 99.8%, synthetic ammonia power consumption per ton is reduced to 30-70 degree (rising with adsorptive pressure reduces), can say so, the present invention is to the revolutionary change of methods such as existing wet method decarburization (adding alkali, improvement MDEA, low-temp methanol washing, NHD and improvement carbon third gradegrade C method as improveing heat) and pressure swing adsorption decarbonization, has thoroughly solved loss of decarbonization device available gas and the high problem of power consumption.
Four, description of drawings:
Description of drawings is as follows:
Fig. 1 is the processing step working procedure table of the embodiment of the invention 1 first stage pressure swing adsorption apparatus adsorption tower.
Fig. 2 is the processing step working procedure table of the embodiment of the invention 1 second stage pressure swing adsorption apparatus adsorption tower.
Fig. 3 is the processing step working procedure table of the embodiment of the invention 1 the 3rd stage pressure swing adsorption apparatus adsorption tower.
Fig. 4 is the process chart of the embodiment of the invention 1.
Fig. 5 is the processing step working procedure table of the embodiment of the invention 2 first stage pressure swing adsorption apparatus adsorption towers.
Fig. 6 is the processing step working procedure table of the embodiment of the invention 2 second stage pressure swing adsorption apparatus adsorption towers.
Fig. 7 is the processing step working procedure table of the embodiment of the invention 2 the 3rd stage pressure swing adsorption apparatus adsorption tower.
Fig. 8 is the process chart of the embodiment of the invention 2.
Fig. 9 is the processing step working procedure table of the embodiment of the invention 3 first stage pressure swing adsorption apparatus adsorption towers.
Figure 10 is the processing step working procedure table of the embodiment of the invention 3 second stage pressure swing adsorption apparatus adsorption towers.
Figure 11 is the processing step working procedure table of the embodiment of the invention 3 the 3rd stage pressure swing adsorption apparatus adsorption tower.
Figure 12 is the process chart of the embodiment of the invention 3.
Figure 13 is the processing step working procedure table of the embodiment of the invention 4 first stage pressure swing adsorption apparatus adsorption towers.
Figure 14 is the processing step working procedure table of the embodiment of the invention 4 second stage pressure swing adsorption apparatus adsorption towers.
Figure 15 is the processing step working procedure table of the embodiment of the invention 4 the 3rd stage pressure swing adsorption apparatus adsorption tower.
Figure 16 is the process chart of the embodiment of the invention 4.
Five, the specific embodiment:
Unstripped gas of the present invention is a synthetic-ammonia transformation gas, comprises that with coal, natural gas, oil and other be the synthetic-ammonia transformation gas of raw material, its typical table composed as follows:
Component H 2 N 2 CO 2 CO CH 4 O 2+Ar Total sulfur H 2O (vapour)
Concentration (%) (V) 46~62 0~20 17~38 0.3~8 1~2 ≤0.8 ≤300mg/Nm 3 Saturated
The present invention adopts the operation of three stage pressure swing adsorption apparatus, synthetic-ammonia transformation gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide with enter all gas the working off one's feeling vent one's spleen of second section pressure swing adsorption gas separation device, and all gas except that the gaseous mixture of the product gas that enters next workshop section and first section pressure swing adsorption gas separation device enters the 3rd section pressure swing adsorption gas separation device in second section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted.The mean concentration of carbon dioxide was 7~15% (V) (determining concrete practical operation concentration according to the carbon dioxide content in the synthetic-ammonia transformation gas) during the first stage pressure swing adsorption apparatus adsorption tower was worked off one's feeling vent one's spleen, the adsorbent that loads from down to up in the adsorption tower is activated alumina and Kiselgel A, the carbon dioxide (mean concentration is 7~15% (V)) that second stage pressure swing adsorption apparatus is used for that first stage pressure swing adsorption apparatus is worked off one's feeling vent one's spleen is removed to the level of next workshop section's needs, or with hydrogen purification to 99.999%, the adsorbent of filling is a Kiselgel A in the adsorption tower, making pure hydrogen is molecular sieve, the carbon dioxide mean concentration was generally 30~50% (V) during the 3rd stage pressure swing adsorption apparatus adsorption tower was worked off one's feeling vent one's spleen, the adsorbent of filling is a Kiselgel A in the adsorption tower, if unstripped gas contains vaporous water, then activated alumina also need be loaded in the adsorption tower bottom.Gaseous mixture impurity was carbon dioxide when decarburization in the middle of the present invention was said, was carbon dioxide, methane, carbon monoxide, nitrogen and oxygen when the pure hydrogen of system.
Each adsorption tower of three stage pressure swing adsorption apparatus experiences following steps successively in a circulation.
First stage pressure swing adsorption apparatus:
(1) absorption A
The conversion pneumatic transmission is gone into to be in the adsorption tower charging aperture of adsorption step, adsorbent in the adsorption tower optionally adsorbs the water in the conversion gas successively, component such as organic sulfur and inorganic sulfur and carbon dioxide, Xi Fu partial CO 2 and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out from the port of export and enter the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, As time goes on, adsorbent water, the total amount of component such as organic sulfur and inorganic sulfur and carbon dioxide constantly increases, when the adsorbents adsorb said components is saturated, stop air inlet, this moment, absorption finished.Gas concentration lwevel preferably is controlled at 7~15% (V) in working off one's feeling vent one's spleen, and can certainly be controlled at gas concentration lwevel in other scopes.
(2) two ends drop pressure 2ED '
After absorption A finishes, hydrogen in the dead space gas in the adsorption tower, nitrogen gas concn is higher and gas concentration lwevel is lower, and this part hydrogen, nitrogen need be recycled on the one hand, and gas concentration lwevel needs to improve in the adsorption tower on the other hand, for this reason, must emit the gas in the adsorption tower and carry out depressurization desorption.The gradation of dead space gas is discharged from the adsorption tower two ends and is entered this section and finished the corresponding adsorption tower of evacuation step and boost, gas of every row is just all pressed once, along with the increase of all pressing number of times, the gas concentration lwevel in exit, adsorption tower two ends constantly increases, and hydrogen, nitrogen obtain recycling simultaneously.All press number of times to finish the gas concentration lwevel decision in exit, adsorption tower two ends, back by adsorptive pressure and absorption, generally all press number of times preferably can satisfy and all press the gas concentration lwevel that finishes adsorption tower exit, back greater than 75% (V), when carrying out above-mentioned drop pressure, preferably carry out simultaneously at two ends, also can be earlier drop pressure forward, later stage before drop pressure balance is forward carried out reverse drop pressure to same adsorption tower simultaneously, purpose is to improve gas concentration lwevel and recovery hydrogen in the adsorption tower, nitrogen, also can carry out forward drop pressure earlier, before the two pressure tower balances, stop forward drop pressure, and then carry out reverse drop pressure, the previous case can improve the adsorbent utilization rate.When carrying out drop pressure, the gas of emitting from the bottom should be less than the gas of emitting from the top.Adsorption tower drop pressure 2ED ' step of the present invention and common adsorption tower drop pressure ED step are different, common adsorption tower drop pressure ED step gas is to emit from the port of export of adsorption tower, be the said forward drop pressure of the present invention, emit and adsorption tower drop pressure 2ED ' gas of the present invention is import and export two ends from adsorption tower.
After absorption A finishes, adsorption tower is when drop pressure, and preceding all the pressure several times adopted forward drop pressure ED, then all presses several times or all presses for the last time and adopt two ends drop pressure 2ED ', after drop pressure finished, the product gas concentration lwevel still can satisfy the urea production requirement.
(3) gaseous mixture step-down D1
After drop pressure 2ED ' finishes, in order further to improve gas concentration lwevel in the adsorption tower, forward the mist in the adsorption tower is emitted simultaneously with reverse step-down, the tolerance of putting into is decided by the concentration that the adsorption tower carbon dioxide will reach, also can be earlier forward forward step-down after reverse step-down or the reverse step-down earlier after the step-down, but forward can improve the adsorbent utilization rate simultaneously with reverse step-down.After drop pressure 2ED ' end, gas concentration lwevel meets the demands in the adsorption tower, can not carry out this step of gaseous mixture step-down D1.
(4) product carbon dioxide step-down D
After gaseous mixture step-down D1 or the end of two ends drop pressure 2ED ' step, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, after the balance, put into product carbon dioxide buffer jar V3 again, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment.When adsorptive pressure is low, can directly put into gas holder V.When product carbon dioxide buffer jar V3 operating pressure is higher (such as greater than 0.02MPa), then the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, after the balance, put into product carbon dioxide buffer jar V3 again, put into gas holder V at last.Before if product carbon dioxide step-down D step is implemented, the pressure in the adsorption tower is lower, then shouldn't product carbon dioxide step-down D step, and directly extract adsorbent carbon dioxide out with vavuum pump.
(5) vacuumize VC or purging CP
After product carbon dioxide step-down D finished, adsorbent carbon dioxide being released with vavuum pump from the adsorption tower bottom entered product carbon dioxide buffer jar V3, when adsorptive pressure is low, can enter gas holder V.After product carbon dioxide step-down D finishes, do not vacuumize the VC step, can adopt to purge the CP step, purge in product carbon dioxide that the gas that adopts be drying or the system other dry gas if do not adopt.When needs reduce the adsorbent consumption, adopt this step.
(6) three sections gas lifts are pressed 3ER
After vacuumizing VC or purging the CP end, utilize the gas of the 3rd stage pressure swing adsorption apparatus adsorption tower adsorption step to boost to finishing the adsorption tower that vacuumizes step from the first stage pressure swing adsorption apparatus adsorption tower port of export through surge tank.
(7) two sections gas lifts are pressed 2ER
After three sections gas lifts pressed 3ER to finish, the gas that enters the gaseous mixture surge tank after utilizing the equal pressure drop ED of the second stage pressure swing adsorption apparatus adsorption tower to finish boosted to finishing the adsorption tower that vacuumizes step from the first stage pressure swing adsorption apparatus adsorption tower port of export.Increase the available gas rate of recovery that this step can improve device.
(8) two ends boost pressure 2ER '
After three sections gas lifts press 3ER or two sections gas lifts to press 2ER to finish, the gas that utilizes this section two ends drop pressure 2ED ' step to discharge, enter adsorption tower from entrance end, make the adsorption tower pressure that progressively raises, two ends boost pressure 2ER ' equates with the number of times of two ends drop pressure 2ED '.The gas of each two ends boost pressure 2ER ' is from the two ends drop pressure 2ED ' gas of different adsorption towers.This section adsorption tower two ends boost pressure 2ER ' step and common boost pressure ER step are different, common adsorption tower boost pressure ER step gas is that the port of export from adsorption tower enters, and enters and this section adsorption tower two ends boost pressure 2ER ' step gas is import and export two ends from adsorption tower.
(9) FR that finally boosts
After two ends boost pressure 2ER ' step finishes, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and adsorption tower is boosted,, also can utilize unstripped gas that the adsorption tower of finishing equal voltage rise ER step is boosted until being raised to adsorptive pressure from the top.
Second stage pressure swing adsorption apparatus
(1) absorption A
The adsorption tower that first stage pressure swing adsorption apparatus is in adsorption step is worked off one's feeling vent one's spleen and is sent into the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower is absorbing carbon dioxide optionally, and components such as the carbon monoxide of difficult absorption, methane, nitrogen, hydrogen are discharged the compression section that enters synthetic ammonia from the port of export.As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, stop air inlet, this moment, absorption finished, gas concentration lwevel is controlled according to producing needs in working off one's feeling vent one's spleen, minimum can arrive that tens ppm work off one's feeling vent one's spleen also can be with hydrogen purification to 99.999% (V).
(2) drop pressure ED
After absorption finished, hydrogen in the dead space gas in the adsorption tower, nitrogen gas concn were higher, and this part hydrogen, nitrogen need be recycled.The gradation of dead space gas is discharged from adsorption tower outlet and is entered this section and finished the corresponding adsorption tower of evacuation step and boost, and gas of every row is just all pressed once, and along with the increase of all pressing number of times, the gas concentration lwevel in adsorption tower exit constantly increases.All press number of times to finish the gas concentration lwevel decision in adsorption tower exit, back by adsorptive pressure and absorption.
(3) reclaim RG
After drop pressure ED finished, gas in the adsorption tower forward, or reverse, or the back is contrary put into surge tank along putting earlier, after this surge tank and first stage pressure swing adsorption apparatus had been finished to vacuumize the boost adsorption tower of PR step of VC or displacement gas and be communicated with again.
(4) the contrary BD of putting
After reclaiming the RG end,, must gas be reduced to normal pressure against the absorption direction if gas pressure is higher in the adsorption tower; If after reclaiming the RG end, gas pressure is very low in the adsorption tower, can cancel the contrary BD step of putting.
(5) vacuumize VC
Reclaim RG or contrary put BD and finish after, from the adsorption tower bottom with vavuum pump with the emptying of releasing of adsorbent carbon dioxide and other component, make adsorbent obtain regeneration.
(6) three sections gas lifts are pressed 2 (3ER2)
After vacuumizing the VC end, utilize the gas of the 3rd stage pressure swing adsorption apparatus adsorption tower adsorption step to boost to finishing the adsorption tower that vacuumizes step from the second stage pressure swing adsorption apparatus adsorption tower port of export through surge tank.
(7) boost pressure ER
After vacuumizing end, the gas that utilizes the drop pressure step to discharge enters from the port of export and to finish the adsorption tower that vacuumizes step, makes the adsorption tower pressure that progressively raises, and boost pressure equates with the number of times of drop pressure.The gas of each boost pressure is from the drop pressure gas of different adsorption towers
(8) FR that finally boosts
After boost pressure finishes, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and adsorption tower is boosted, until being raised to adsorptive pressure from the top.
The 3rd stage pressure swing adsorption apparatus:
(1) absorption A
With in first section pressure swing adsorption gas separation device except that the product carbon dioxide with enter all gas the working off one's feeling vent one's spleen of second section pressure swing adsorption gas separation device, and all gas except that the gaseous mixture of the product gas that enters next workshop section and first section pressure swing adsorption gas separation device enters the 3rd section pressure swing adsorption gas separation device in second section pressure swing adsorption gas separation device.Adsorbent in the adsorption tower is absorbing carbon dioxide optionally, and the components such as carbon monoxide, methane, nitrogen, hydrogen that are difficult for absorption are discharged from the port of export and entered first stage pressure swing adsorption apparatus and finished the adsorption tower that vacuumizes the VC step and carry out three sections gas lifts and press 3ER.As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, stop air inlet, this moment, absorption finished, gas concentration lwevel is controlled as required in working off one's feeling vent one's spleen, and generally is controlled in 30~60% (V) scope, gas concentration lwevel in working off one's feeling vent one's spleen can certainly be controlled in other scope.Adsorptive pressure is generally in 0.005~0.2MPa scope, should not be too high, can with in first section pressure swing adsorption gas separation device except that the product carbon dioxide with enter all gas the working off one's feeling vent one's spleen of second section pressure swing adsorption gas separation device, and send into the adsorption tower that the 3rd stage pressure swing adsorption apparatus is in adsorption step after the pressurization of all gas except that the gaseous mixture of the product gas that enters next workshop section and first section pressure swing adsorption gas separation device in second section pressure swing adsorption gas separation device, can not pressurize yet.
(2) drop pressure ED
After absorption A finishes, hydrogen in the dead space gas in the adsorption tower, nitrogen gas concn is higher and gas concentration lwevel is lower, this part hydrogen, nitrogen need be recycled on the one hand, gas concentration lwevel needs to improve in the adsorption tower on the other hand, for this reason, must be the gas in the adsorption tower along adsorbing direction from the step-down of adsorption tower exit.When adsorptive pressure is low (such as less than 0.02MPa), can not carry out the drop pressure step, directly replace the P step or vacuumize the VC step.
When the adsorption tower bottom is filled with aluminium oxide, adopt two ends drop pressure 2ED ', fully reclaim available gas such as interior hydrogen and nitrogen gas of adsorption tower and carbon monoxide.
(3) product carbon dioxide replacement P
After drop pressure ED finishes, part product carbon dioxide is after power-equipment C pressurization, enter adsorption tower from the adsorption tower bottom inlet, replace other component along the absorption direction by adsorption tower, displace implication and enter the 3rd stage pressure swing adsorption apparatus and finished the adsorption tower of boost pressure ER step and boost, displacement pressure is a little more than normal pressure.When the replacement product gas concentration lwevel can not reach requirement yet, product carbon dioxide replacement P step can not wanted.If adsorptive pressure is higher, this part displacement can be from the product carbon dioxide buffer jar V3 of first stage pressure swing adsorption apparatus with the product carbon dioxide.When requiring, the rate of recovery of product carbon dioxide and other gas such as 99.9% (V), can not cancel product carbon dioxide replacement P step when very high.
(4) vacuumize VC
After drop pressure ED step finishes, or after the end of product carbon dioxide replacement P step, with vavuum pump adsorbent carbon dioxide is released as the use of product carbon dioxide, make adsorbent obtain regeneration simultaneously from the adsorption tower bottom.
(5) boost pressure ER
After vacuumizing end, utilize the gas of drop pressure step discharge, enter from the port of export and finish the adsorption tower that vacuumizes step, adsorption tower is boosted.When adsorptive pressure is low (such as less than 0.02MPa), can not carry out the boost pressure step.When the adsorption tower bottom is filled with aluminium oxide, then need adopt two ends boost pressure 2ER ', fully reclaim available gas such as interior hydrogen and nitrogen gas of adsorption tower and carbon monoxide.
(6) the displacement gas PR that boosts
After boost pressure ER finishes, utilize the exit gas of other adsorption tower displacement of this stage pressure swing adsorption apparatus P step that adsorption tower is boosted.
(7) R that boosts
Vacuumize VC or boost pressure ER or displacement gas and boost after PR finishes, adsorption column pressure is near adsorptive pressure, can be further with inlet gas or work off one's feeling vent one's spleen adsorption tower is boosted near adsorptive pressure.
Embodiments of the invention 1:
Unstripped gas of the present invention is a synthetic-ammonia transformation gas, comprises that with coal, natural gas, oil and other be the synthetic-ammonia transformation gas of raw material.
The synthetic-ammonia transformation gas of present embodiment is composed as follows:
Component H2 N2 CO2 CO CH4 O2+Ar total sulfur water (vapour)
Concentration V% 52~53 17~18 25~28≤1~6 1~2≤0.8 150mg/Nm3 is saturated
Temperature :≤40 ℃
Pressure: 0.7MPa (G), the discharge pressure of product carbon dioxide are 0.005MPa
As shown in Figure 4, adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, and the adsorbent that loads from down to up in the adsorption tower is followed successively by activated alumina and Kiselgel A, moves single tower absorption and all presses program nine times; Adsorption tower a~g is totally 7 composition second stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, moves single tower absorption and all presses program four times, utilizes vacuum pipeline G27 that adsorption tower is vacuumized by vavuum pump P2; Adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, and when containing vaporous water in the inlet gas, the adsorbent of filling is activated alumina and Kiselgel A in the adsorption tower.V is the first stage pressure swing adsorption apparatus product carbon dioxide gas holder, and P1, P2 and P3 are respectively first section, second section and the 3rd stage pressure swing adsorption apparatus vavuum pump.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~g upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
Conversion gas enters the adsorption tower that first stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower optionally adsorbs the components such as water, organic sulfur, inorganic sulfur and carbon dioxide in the conversion gas successively, components such as the carbon monoxide of Xi Fu partial CO 2 and difficult absorption, methane, nitrogen, hydrogen are not discharged from the port of export and are entered the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower is absorbing carbon dioxide optionally, and components such as the carbon monoxide of difficult absorption, methane, nitrogen, hydrogen are discharged from the port of export and entered compression section.The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, vacuumize VC, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, the contrary BD of putting, vacuumize VC, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, vacuumize VC, the R pressure swing adsorption technique step of boosting.Be example with the A tower now, contrast Fig. 1 and Fig. 4 illustrate the processing step of the present embodiment first stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the A tower has been finished the FR step of finally boosting, open sequencing valve 1A, 2A, conversion gas enters adsorption tower A through pipeline G11, in adsorption tower A, adsorbent optionally adsorbs the water in the conversion gas successively, organic sulfur, component such as inorganic sulfur and carbon dioxide, Xi Fu partial CO 2 and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out through sequencing valve 2A from the port of export and enter the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, As time goes on, adsorbent water, the total amount of component such as organic sulfur and inorganic sulfur and carbon dioxide constantly increases, when the adsorbents adsorb said components is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1A, 2A, gas concentration lwevel is controlled at 10~15% (V) in working off one's feeling vent one's spleen.
(2) the equal voltage drop step in the two ends first time is called for short two ends one and all falls 2E1D '
After absorption finishes, open sequencing valve 3A, 3C, 10A and 10C, the gas in the A tower enters the C tower through pipeline G13 and G110 the C tower is carried out boost pressure in two ends (being called for short 2E1R '), after A and C pressure tower are in a basic balance, closes sequencing valve 3A, 10C.
(3) the equal voltage drop step in the two ends second time is called for short two ends two and all falls 2E2D '
After 2E1D ' end all falls in two ends one, open sequencing valve 4A, 4D and 10D, gas in the A tower enters the D tower through pipeline G14 and G110 the D tower is carried out two ends secondary boost pressure (being called for short 2E2R '), after A and D pressure tower are in a basic balance, closes sequencing valve 4D, 10A and 10D.
(4) the equal voltage drop step in two ends for the third time is called for short two ends three and all falls 2E3D '
After 2E2D ' end all falls in two ends two, open sequencing valve 4E, 11A and 11E, gas in the A tower enters the E tower through pipeline G14 and G111 the E tower is carried out three boost pressures in two ends (being called for short 2E3R '), after A and E pressure tower are in a basic balance, closes sequencing valve 4A, 4E and 11E.
(5) the 4th equal voltage drop step in two ends are called for short two ends four and all fall 2E4D '
After 2E3D ' end all falls in two ends three, open sequencing valve 5A, 5F and 11F, gas in the A tower enters the F tower through pipeline G15 and G111 the F tower is carried out four boost pressures in two ends (being called for short 2E4R '), after A and F pressure tower are in a basic balance, closes sequencing valve 5F, 11A and 11F.
(6) the 5th equal voltage drop step in two ends are called for short two ends five and all fall 2E5D '
After 2E4D ' end all falls in two ends four, open sequencing valve 5G, 12A and 12G, gas in the A tower enters the G tower through pipeline G15 and G112 the G tower is carried out five boost pressures in two ends (being called for short 2E5R '), after A and G pressure tower are in a basic balance, closes sequencing valve 5A, 5G and 12G.
(7) the 6th equal voltage drop step in two ends are called for short two ends six and all fall 2E6D '
After 2E5D ' end all falls in two ends five, open sequencing valve 6A, 6H and 12H, gas in the A tower enters the H tower through pipeline G16 and G112 the H tower is carried out six boost pressures in two ends (being called for short 2E6R '), after A and H pressure tower are in a basic balance, closes sequencing valve 6H, 12A and 12H.
(8) the 7th equal voltage drop step in two ends are called for short two ends seven and all fall 2E7D '
After 2E6D ' end all falls in two ends six, open sequencing valve 6I, 13A and 13I, gas in the A tower enters the I tower through pipeline G16 and G113 the I tower is carried out seven boost pressures in two ends (being called for short 2E7R '), after A and I pressure tower are in a basic balance, closes sequencing valve 6A, 6I and 13I.
(9) the 8th equal voltage drop step in two ends are called for short two ends eight and all fall 2E8D '
After 2E7D ' end all falls in two ends seven, open sequencing valve 7A, 7J and 13J, gas in the A tower enters the J tower through pipeline G17 and G113 the J tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and J pressure tower are in a basic balance, closes sequencing valve 7J, 13A and 13J.
(10) the 9th equal voltage drop step in two ends are called for short two ends nine and all fall 2E9D '
After 2E8D ' end all falls in two ends eight, open sequencing valve 7K, 14A and 14K, gas in the A tower enters the K tower through pipeline G17 and G114 the K tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and K pressure tower are in a basic balance, closes sequencing valve 7A, 7K, 14A and 14K.
(11) vacuumize VC
Sequencing valve 9A is opened after all falling 2E9D ' end in two ends nine, and the carbon dioxide in the tower being released from the A tower bottom through pipeline G19, vavuum pump P1 enters product carbon dioxide gas holder V, vacuumize end after, close sequencing valve 9A.
(12) three sections gas lifts are pressed 3ER
After vacuumizing the VC end, open sequencing valve 8A, KV-18, the gas in the surge tank V7 enters the A tower A tower is boosted, and after the pressure of surge tank V7 and adsorption tower A is in a basic balance, boosts after the end, closes sequencing valve 8A and KV-18.
(13) the 9th equal voltage rise steps in two ends are called for short two ends nine and all rise 2E9R '
After three sections gas lifts press 3ER to finish, open sequencing valve 7A, 7C, 14A and 14C, gas in the C tower enters the A tower through pipeline G17 and G114 the A tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and C pressure tower are in a basic balance, closes sequencing valve 7C, 14A and 14C.
(14) the 8th equal voltage rise steps in two ends are called for short two ends eight and all rise 2E8R '
After two ends nine all rise 2E9R ' end, open sequencing valve 7D, 13A and 13D, gas in the D tower enters the A tower through pipeline G17 and G113 the A tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and D pressure tower are in a basic balance, close sequencing valve 7A,, 7D and 13D.
(15) the 7th equal voltage rise steps in two ends are called for short two ends seven and all rise 2E7R '
After two ends eight all rise 2E8R ' end, open sequencing valve 6A, 6E and 13E, gas in the E tower enters the A tower through pipeline G16 and G113 the A tower is carried out seven boost pressures in two ends (being called for short 2E7R '), after A and E pressure tower are in a basic balance, closes sequencing valve 6E, 13A and 13E.
(16) the 6th equal voltage rise steps in two ends are called for short two ends six and all rise 2E6R '
After two ends seven all rise 2E7R ' end, open sequencing valve 6F, 12A and 12F, gas in the D tower enters the A tower through pipeline G16 and G112 the A tower is carried out six boost pressures in two ends (being called for short 2E6R '), after A and F pressure tower are in a basic balance, closes sequencing valve 6A, 6F and 12F.
(17) the 5th equal voltage rise steps in two ends are called for short two ends five and all rise 2E5R '
After two ends six all rise 2E6R ' end, open sequencing valve 5A, 5G and 12G, gas in the G tower enters the A tower through pipeline G15 and G112 the A tower is carried out five boost pressures in two ends (being called for short 2E5R '), after A and G pressure tower are in a basic balance, closes sequencing valve 5G, 12A and 12G.
(18) the 4th equal voltage rise steps in two ends are called for short two ends four and all rise 2E4R '
After two ends five all rise 2E5R ' end, open sequencing valve 5H, 11A and 11H, gas in the H tower enters the A tower through pipeline G15 and G111 the A tower is carried out four boost pressures in two ends (being called for short 2E4R '), after A and H pressure tower are in a basic balance, closes sequencing valve 5A, 5H and 11H.
(19) the equal voltage rise step in two ends for the third time is called for short two ends three and all rises 2E3R '
After two ends four all rise 2E4R ' end, open sequencing valve 4A, 4I and 11I, gas in the I tower enters the A tower through pipeline G14 and G111 the A tower is carried out three boost pressures in two ends (being called for short 2E3R '), after A and T pressure tower are in a basic balance, closes sequencing valve 4I, 11A and 11I.
(20) the equal voltage rise step in the two ends second time is called for short two ends two and all rises 2E2R '
After two ends three all rise 2E3R ' end, open sequencing valve 4J, 10A and 10J, gas in the J tower enters the A tower through pipeline G14 and G110 the A tower is carried out two ends secondary boost pressure (being called for short 2E2R '), after A and J pressure tower are in a basic balance, closes sequencing valve 4A, 4J and 10J.
(21) the equal voltage rise step in the two ends first time is called for short two ends one and all rises 2E1R '
After two ends two all rise 2E2R ' end, open sequencing valve 3A, 3K and 10K, gas in the K tower enters the A tower through pipeline G13 and G110 the A tower is carried out boost pressure in two ends (being called for short 2E1R '), after A and K pressure tower are in a basic balance, closes sequencing valve 3K, 10A and 10K.
(22) FR that finally boosts
Sequencing valve KV-12 is opened after all rising 2E1R ' end in two ends one, utilizes the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boosts from the top to the A tower, when the A pressure tower rises near adsorptive pressure, closes sequencing valve KV-12,3A.Also can be with unstripped gas to the A tower FR that finally boosts.
So far, the A tower has been finished a circulation, can enter next circulation again.B~L adsorption tower is the same with the circulation step of A tower, just staggers mutually on the time, sees Fig. 1 and Fig. 4.
Be example with a tower now, contrast Fig. 2 and Fig. 4 illustrate the processing step of the present embodiment second stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the a tower has been finished the FR step of finally boosting, open sequencing valve 1a, 2a, middle gaseous mixture enters adsorption tower a through pipeline G21, in a adsorption tower, adsorbent optionally adsorbs the components such as carbon dioxide of first stage pressure swing adsorption apparatus in working off one's feeling vent one's spleen, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out the compression section that enters synthetic ammonia from the port of export through sequencing valve 2a, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, the gas concentration lwevel of working off one's feeling vent one's spleen is controlled at below 0.2% (V), closes sequencing valve 1a, 2a stops air inlet, this moment, absorption finished, and closed sequencing valve 1a, 2a.
(2) for the first time equal voltage drop step is called for short one and all falls E1D
After absorption A finishes, open sequencing valve 3a, 3c, the gas in a tower enters the c tower through pipeline G23 to carry out one to the c tower and all rises, and after a and c pressure tower are in a basic balance, closes sequencing valve 3a.
(3) for the second time equal voltage drop step is called for short two and all falls E2D
One all falls after E1D finishes, and opens sequencing valve 4a, 4d, and the gas in a tower enters the d tower through pipeline G24 to carry out two to the d tower and all rise, and after a and d pressure tower are in a basic balance, closes sequencing valve 4d.
(4) equal for the third time voltage drop step is called for short three and all falls E3D
Two all fall after E2D finishes, and open sequencing valve 4e, and the gas in a tower enters the e tower through pipeline G24 to carry out three to the e tower and all rise, and after a and e pressure tower are in a basic balance, close sequencing valve 4a.
(5) the 4th equal voltage drop step are called for short four and all fall E4D
Three all fall after E3D finishes, and open sequencing valve 5a, 5f, and the gas in a tower enters the f tower through pipeline G25 to carry out four to the f tower and all rise, and after a and f pressure tower are in a basic balance, close sequencing valve 5f.
(6) the contrary BD of putting
Four all fall after E4D finishes, and open sequencing valve 7a, with the reverse emptying of the gas in a tower, when the gas in a tower drops near normal pressure, close sequencing valve 7a.
(7) vacuumize VC
Contrary put BD and finish after, open sequencing valve 8a, through pipeline G27, vavuum pump P2 from a tower bottom the emptying of releasing of the gas in the tower, vacuumize end after, close sequencing valve 8a.
(8) the 4th equal voltage rise steps are called for short four and all rise E4R
Vacuumize after VC finishes, open sequencing valve 5a, 5c, the gas in the c tower enters a tower through pipeline G25 to carry out four to a tower and all rises, and after c and a pressure tower are in a basic balance, closes sequencing valve 5a, 5c.
(9) equal for the third time voltage rise step is called for short three and all rises E3R
Four all rise E4R finish after, open sequencing valve 4a, 4d, the gas in the d tower enters a tower through pipeline G24 to carry out three to a tower and all rises, and after d and a pressure tower are in a basic balance, closes sequencing valve 4d.
(10) for the second time equal voltage rise step is called for short two and all rises E2R
Three all rise E3R finish after, open sequencing valve 4e, the gas in the e tower enters a tower through pipeline G24 to carry out two to a tower and all rises, and after e and a pressure tower are in a basic balance, closes sequencing valve 4e, 4a.
(11) for the first time equal voltage rise step is called for short one and all rises E1R
Two all rise E2R finish after, open sequencing valve 3a, 3f, the gas in the f tower enters a tower through pipeline G23 to carry out one to a tower and all rises, and after f and a pressure tower are in a basic balance, closes sequencing valve 3f.
(12) FR that finally boosts
One all rises E1R finish after, open sequencing valve KV-16, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost from the top to a tower, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-16,3a.
So far, a tower has been finished a circulation, can enter next circulation again.B~g adsorption tower is the same with the circulation step of A tower, just staggers mutually on the time, sees Fig. 2 and Fig. 4.
Be example with a ' tower now, contrast Fig. 3 and Fig. 4 illustrate the processing step of present embodiment the 3rd stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, a ' tower has been finished the R step of boosting, open sequencing valve 1a ', 2a ', the second stage pressure swing adsorption apparatus adsorption tower is in the contrary mist of putting the BD step and vacuumizing the VC step and enters adsorption tower a ' through G31, in a ' adsorption tower, adsorbent optionally is absorbed into the components such as carbon dioxide in the implication, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen enter surge tank V7 from the port of export through sequencing valve 2a ' outflow, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1a ', 2a ', gas concentration lwevel is controlled at below 45% (V) in working off one's feeling vent one's spleen.Adsorptive pressure is in the 0.02MPa scope, also mist can be pressurized to more and send into the adsorption tower that the 3rd stage pressure swing adsorption apparatus is in adsorption step after the high pressure.
(2) vacuumize VC
After absorption A finishes, open sequencing valve 4a ', the carbon dioxide in the tower being released from a ' tower bottom through pipeline G34, vavuum pump P3 enters product carbon dioxide gas holder V, vacuumize end after, close sequencing valve 4a '.
(3) R that boosts
After vacuumizing the VC end, open sequencing valve 3a ' and KV-17, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-17 and 3a ' from the top to a tower.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 50~60 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 0.7MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 2:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 1 are in full accord, the adsorptive pressure of present embodiment is 0.9MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
As shown in Figure 8, adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, and the adsorbent that loads from down to up in the adsorption tower is followed successively by activated alumina and Kiselgel A, moves single tower absorption and all presses program nine times; Adsorption tower a~g is totally 7 composition second stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, moves single tower absorption and all presses program four times, utilizes vacuum pipeline G27 that adsorption tower is vacuumized by vavuum pump P2; Adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, and when containing vaporous water in the inlet gas, the adsorbent of filling is activated alumina and Kiselgel A in the adsorption tower.V is the first stage pressure swing adsorption apparatus product carbon dioxide gas holder, and P1, P2 and P3 are respectively first section, second section and the 3rd stage pressure swing adsorption apparatus vavuum pump.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~g upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
Conversion gas enters the adsorption tower that first stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower optionally adsorbs the components such as water, organic sulfur, inorganic sulfur and carbon dioxide in the conversion gas successively, components such as the carbon monoxide of Xi Fu partial CO 2 and difficult absorption, methane, nitrogen, hydrogen are not discharged from the port of export and are entered the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower is absorbing carbon dioxide optionally, and components such as the carbon monoxide of difficult absorption, methane, nitrogen, hydrogen are discharged from the port of export and entered compression section.The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, vacuumize VC, three sections gas lifts are pressed 3ER, two sections gas lifts are pressed 2ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, reclaim RG, vacuumize VC, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, vacuumize VC, the R pressure swing adsorption technique step of boosting.Be example with the A tower now, contrast Fig. 1 and Fig. 4 illustrate the processing step of the present embodiment first stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the A tower has been finished the FR step of finally boosting, open sequencing valve 1A, 2A, conversion gas enters adsorption tower A through pipeline G11, in adsorption tower A, adsorbent optionally adsorbs the water in the conversion gas successively, organic sulfur, component such as inorganic sulfur and carbon dioxide, Xi Fu partial CO 2 and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out through sequencing valve 2A from the port of export and enter the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, As time goes on, adsorbent water, the total amount of component such as organic sulfur and inorganic sulfur and carbon dioxide constantly increases, when the adsorbents adsorb said components is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1A, 2A, gas concentration lwevel is controlled at 10~15% (V) in working off one's feeling vent one's spleen.
(2) the equal voltage drop step in the two ends first time is called for short two ends one and all falls 2E1D '
After absorption finishes, open sequencing valve 3A, 3C, 10A and 10C, the gas in the A tower enters the C tower through pipeline G13 and G110 the C tower is carried out boost pressure in two ends (being called for short 2E1R '), after A and C pressure tower are in a basic balance, closes sequencing valve 3A, 10C.
(3) the equal voltage drop step in the two ends second time is called for short two ends two and all falls 2E2D '
After 2E1D ' end all falls in two ends one, open sequencing valve 4A, 4D and 10D, gas in the A tower enters the D tower through pipeline G14 and G110 the D tower is carried out two ends secondary boost pressure (being called for short 2E2R '), after A and D pressure tower are in a basic balance, closes sequencing valve 4D, 10A and 10D.
(4) the equal voltage drop step in two ends for the third time is called for short two ends three and all falls 2E3D '
After 2E2D ' end all falls in two ends two, open sequencing valve 4E, 11A and 11E, gas in the A tower enters the E tower through pipeline G14 and G111 the E tower is carried out three boost pressures in two ends (being called for short 2E3R '), after A and E pressure tower are in a basic balance, closes sequencing valve 4A, 4E and 11E.
(5) the 4th equal voltage drop step in two ends are called for short two ends four and all fall 2E4D '
After 2E3D ' end all falls in two ends three, open sequencing valve 5A, 5F and 11F, gas in the A tower enters the F tower through pipeline G15 and G111 the F tower is carried out four boost pressures in two ends (being called for short 2E4R '), after A and F pressure tower are in a basic balance, closes sequencing valve 5F, 11A and 11F.
(6) the 5th equal voltage drop step in two ends are called for short two ends five and all fall 2E5D '
After 2E4D ' end all falls in two ends four, open sequencing valve 5G, 12A and 12G, gas in the A tower enters the G tower through pipeline G15 and G112 the G tower is carried out five boost pressures in two ends (being called for short 2E5R '), after A and G pressure tower are in a basic balance, closes sequencing valve 5A, 5G and 12G.
(7) the 6th equal voltage drop step in two ends are called for short two ends six and all fall 2E6D '
After 2E5D ' end all falls in two ends five, open sequencing valve 6A, 6H and 12H, gas in the A tower enters the H tower through pipeline G16 and G112 the H tower is carried out six boost pressures in two ends (being called for short 2E6R '), after A and H pressure tower are in a basic balance, closes sequencing valve 6H, 12A and 12H.
(8) the 7th equal voltage drop step in two ends are called for short two ends seven and all fall 2E7D '
After 2E6D ' end all falls in two ends six, open sequencing valve 6I, 13A and 13I, gas in the A tower enters the I tower through pipeline G16 and G113 the I tower is carried out seven boost pressures in two ends (being called for short 2E7R '), after A and I pressure tower are in a basic balance, closes sequencing valve 6A, 6I and 13I.
(9) the 8th equal voltage drop step in two ends are called for short two ends eight and all fall 2E8D '
After 2E7D ' end all falls in two ends seven, open sequencing valve 7A, 7J and 13J, gas in the A tower enters the J tower through pipeline G17 and G113 the J tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and J pressure tower are in a basic balance, closes sequencing valve 7J, 13A and 13J.
(10) the 9th equal voltage drop step in two ends are called for short two ends nine and all fall 2E9D '
After 2E8D ' end all falls in two ends eight, open sequencing valve 7K, 14A and 14K, gas in the A tower enters the K tower through pipeline G17 and G114 the K tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and K pressure tower are in a basic balance, closes sequencing valve 7A, 7K, 14A and 14K.
(11) vacuumize VC
Sequencing valve 9A is opened after all falling 2E9D ' end in two ends nine, and the carbon dioxide in the tower being released from the A tower bottom through pipeline G19, vavuum pump P1 enters product carbon dioxide gas holder V, vacuumize end after, close sequencing valve 9A.
(12) three sections gas lifts are pressed 3ER
After vacuumizing the VC end, open sequencing valve 8A, KV-18, the gas in the surge tank V7 enters the A tower A tower is boosted, and after the pressure of surge tank V7 and adsorption tower A is in a basic balance, boosts after the end, closes sequencing valve 8A and KV-18.
(13) two sections gas lifts are pressed 2ER
After three sections gas lifts press 3ER to finish, open sequencing valve 8A, KV-15, the gas in the surge tank V1 enters the A tower A tower is boosted, and after the pressure of surge tank V1 and adsorption tower A is in a basic balance, boosts after the end, closes sequencing valve 8A and KV-15.
(14) the 9th equal voltage rise steps in two ends are called for short two ends nine and all rise 2E9R '
After two sections gas lifts press 2ER to finish, open sequencing valve 7A, 7C, 14A and 14C, gas in the C tower enters the A tower through pipeline G17 and G114 the A tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and C pressure tower are in a basic balance, closes sequencing valve 7C, 14A and 14C.
(15) the 8th equal voltage rise steps in two ends are called for short two ends eight and all rise 2E8R '
After two ends nine all rise 2E9R ' end, open sequencing valve 7D, 13A and 13D, gas in the D tower enters the A tower through pipeline G17 and G113 the A tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and D pressure tower are in a basic balance, close sequencing valve 7A,, 7D and 13D.
(16) the 7th equal voltage rise steps in two ends are called for short two ends seven and all rise 2E7R '
After two ends eight all rise 2E8R ' end, open sequencing valve 6A, 6E and 13E, gas in the E tower enters the A tower through pipeline G16 and G113 the A tower is carried out seven boost pressures in two ends (being called for short 2E7R '), after A and E pressure tower are in a basic balance, closes sequencing valve 6E, 13A and 13E.
(17) the 6th equal voltage rise steps in two ends are called for short two ends six and all rise 2E6R '
After two ends seven all rise 2E7R ' end, open sequencing valve 6F, 12A and 12F, gas in the D tower enters the A tower through pipeline G16 and G112 the A tower is carried out six boost pressures in two ends (being called for short 2E6R '), after A and F pressure tower are in a basic balance, closes sequencing valve 6A, 6F and 12F.
(18) the 5th equal voltage rise steps in two ends are called for short two ends five and all rise 2E5R '
After two ends six all rise 2E6R ' end, open sequencing valve 5A, 5G and 12G, gas in the G tower enters the A tower through pipeline G15 and G112 the A tower is carried out five boost pressures in two ends (being called for short 2E5R '), after A and G pressure tower are in a basic balance, closes sequencing valve 5G, 12A and 12G.
(19) the 4th equal voltage rise steps in two ends are called for short two ends four and all rise 2E4R '
After two ends five all rise 2E5R ' end, open sequencing valve 5H, 11A and 11H, gas in the H tower enters the A tower through pipeline G15 and G111 the A tower is carried out four boost pressures in two ends (being called for short 2E4R '), after A and H pressure tower are in a basic balance, closes sequencing valve 5A, 5H and 11H.
(20) the equal voltage rise step in two ends for the third time is called for short two ends three and all rises 2E3R '
After two ends four all rise 2E4R ' end, open sequencing valve 4A, 4I and 11I, gas in the I tower enters the A tower through pipeline G14 and G111 the A tower is carried out three boost pressures in two ends (being called for short 2E3R '), after A and I pressure tower are in a basic balance, closes sequencing valve 4I, 11A and 11I.
(21) the equal voltage rise step in the two ends second time is called for short two ends two and all rises 2E2R '
After two ends three all rise 2E3R ' end, open sequencing valve 4J, 10A and 10J, gas in the J tower enters the A tower through pipeline G14 and G110 the A tower is carried out two ends secondary boost pressure (being called for short 2E2R '), after A and J pressure tower are in a basic balance, closes sequencing valve 4A, 4J and 10J.
(22) the equal voltage rise step in the two ends first time is called for short two ends one and all rises 2E1R '
After two ends two all rise 2E2R ' end, open sequencing valve 3A, 3K and 10K, gas in the K tower enters the A tower through pipeline G13 and G110 the A tower is carried out boost pressure in two ends (being called for short 2E1R '), after A and K pressure tower are in a basic balance, closes sequencing valve 3K, 10A and 10K.
(23) FR that finally boosts
Sequencing valve KV-12 is opened after all rising 2E1R ' end in two ends one, utilizes the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boosts from the top to the A tower, when the A pressure tower rises near adsorptive pressure, closes sequencing valve KV-12,3A.Also can be with unstripped gas to the A tower FR that finally boosts.
So far, the A tower has been finished a circulation, can enter next circulation again.B~L adsorption tower is the same with the circulation step of A tower, just staggers mutually on the time, sees Fig. 5 and Fig. 8.
Be example with a tower now, contrast Fig. 6 and Fig. 8 illustrate the processing step of the present embodiment second stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the a tower has been finished the FR step of finally boosting, open sequencing valve 1a, 2a, middle gaseous mixture enters adsorption tower a through pipeline G21, in a adsorption tower, adsorbent optionally adsorbs the components such as carbon dioxide of first stage pressure swing adsorption apparatus in working off one's feeling vent one's spleen, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out the compression section that enters synthetic ammonia from the port of export through sequencing valve 2a, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, the gas concentration lwevel of working off one's feeling vent one's spleen is controlled at below 0.2% (V), closes sequencing valve 1a, 2a stops air inlet, this moment, absorption finished, and closed sequencing valve 1a, 2a.
(2) for the first time equal voltage drop step is called for short one and all falls E1D
After absorption A finishes, open sequencing valve 3a, 3c, the gas in a tower enters the c tower through pipeline G23 to carry out one to the c tower and all rises, and after a and c pressure tower are in a basic balance, closes sequencing valve 3a.
(3) for the second time equal voltage drop step is called for short two and all falls E2D
One all falls after E1D finishes, and opens sequencing valve 4a, 4d, and the gas in a tower enters the d tower through pipeline G24 to carry out two to the d tower and all rise, and after a and d pressure tower are in a basic balance, closes sequencing valve 4d.
(4) equal for the third time voltage drop step is called for short three and all falls E3D
Two all fall after E2D finishes, and open sequencing valve 4e, and the gas in a tower enters the e tower through pipeline G24 to carry out three to the e tower and all rise, and after a and e pressure tower are in a basic balance, close sequencing valve 4a.
(5) the 4th equal voltage drop step are called for short four and all fall E4D
Three all fall after E3D finishes, and open sequencing valve 5a, 5f, and the gas in a tower enters the f tower through pipeline G25 to carry out four to the f tower and all rise, and after a and f pressure tower are in a basic balance, close sequencing valve 5f.
(6) reclaim RG
Four all fall after E4D finishes, and open sequencing valve 6a, KV-15, with the reverse surge tank V1 that puts into of the gas in a tower, make the gas pressure in a tower drop to the pressure near surge tank V1, after finishing, close sequencing valve 6a and KV-15.
(7) vacuumize VC
After reclaiming RG and finishing, open sequencing valve 8a, through pipeline G27, vavuum pump P2 from a tower bottom the emptying of releasing of the gas in the tower, vacuumize end after, close sequencing valve 8a.
(8) the 4th equal voltage rise steps are called for short four and all rise E4R
Vacuumize after VC finishes, open sequencing valve 5a, 5c, the gas in the c tower enters a tower through pipeline G25 to carry out four to a tower and all rises, and after c and a pressure tower are in a basic balance, closes sequencing valve 5a, 5c.
(9) equal for the third time voltage rise step is called for short three and all rises E3R
Four all rise E4R finish after, open sequencing valve 4a, 4d, the gas in the d tower enters a tower through pipeline G24 to carry out three to a tower and all rises, and after d and a pressure tower are in a basic balance, closes sequencing valve 4d.
(10) for the second time equal voltage rise step is called for short two and all rises E2R
Three all rise E3R finish after, open sequencing valve 4e, the gas in the e tower enters a tower through pipeline G24 to carry out two to a tower and all rises, and after e and a pressure tower are in a basic balance, closes sequencing valve 4e, 4a.
(11) for the first time equal voltage rise step is called for short one and all rises E1R
Two all rise E2R finish after, open sequencing valve 3a, 3f, the gas in the f tower enters a tower through pipeline G23 to carry out one to a tower and all rises, and after f and a pressure tower are in a basic balance, closes sequencing valve 3f.
(12) FR that finally boosts
One all rises E1R finish after, open sequencing valve KV-16, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost from the top to a tower, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-16,3a.
So far, a tower has been finished a circulation, can enter next circulation again.B~g adsorption tower is the same with the circulation step of A tower, just staggers mutually on the time, sees Fig. 6 and Fig. 8.
Be example with a ' tower now, contrast Fig. 7 and Fig. 8 illustrate the processing step of present embodiment the 3rd stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, a ' tower has been finished the R step of boosting, open sequencing valve 1a ', 2a ', the second stage pressure swing adsorption apparatus adsorption tower is in the contrary mist of putting the BD step and vacuumizing the VC step and enters adsorption tower a ' through G31, in a ' adsorption tower, adsorbent optionally is absorbed into the components such as carbon dioxide in the implication, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen enter surge tank V7 from the port of export through sequencing valve 2a ' outflow, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1a ', 2a ', gas concentration lwevel is controlled at below 45% (V) in working off one's feeling vent one's spleen.Adsorptive pressure is in the 0.02MPa scope, also mist can be pressurized to more and send into the adsorption tower that the 3rd stage pressure swing adsorption apparatus is in adsorption step after the high pressure.
(2) vacuumize VC
After absorption A finishes, open sequencing valve 4a ', the carbon dioxide in the tower being released from a ' tower bottom through pipeline G34, vavuum pump P3 enters product carbon dioxide gas holder V, vacuumize end after, close sequencing valve 4a '.
(3) R that boosts
After vacuumizing the VC end, open sequencing valve 3a ' and KV-17, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-17 and 3a ' from the top to a tower.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 45~58 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 0.9MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 3:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 1 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
As shown in figure 12, adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, and the adsorbent that loads from down to up in the adsorption tower is followed successively by activated alumina and Kiselgel A, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, moves single tower absorption and all presses program seven times, utilizes vacuum pipeline G27 that adsorption tower is vacuumized by vavuum pump P2; Adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, and when containing vaporous water in the inlet gas, the adsorbent of filling is activated alumina and Kiselgel A in the adsorption tower.V is the first stage pressure swing adsorption apparatus product carbon dioxide gas holder, and P2 and P3 are respectively second section and the 3rd stage pressure swing adsorption apparatus vavuum pump.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
Conversion gas enters the adsorption tower that first stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower optionally adsorbs the components such as water, organic sulfur, inorganic sulfur and carbon dioxide in the conversion gas successively, components such as the carbon monoxide of Xi Fu partial CO 2 and difficult absorption, methane, nitrogen, hydrogen are not discharged from the port of export and are entered the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower is absorbing carbon dioxide optionally, and components such as the carbon monoxide of difficult absorption, methane, nitrogen, hydrogen are discharged from the port of export and entered compression section.The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, vacuumize VC, the R pressure swing adsorption technique step of boosting.Be example with the A tower now, contrast Fig. 9 and Figure 12 illustrate the processing step of the present embodiment first stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the A tower has been finished the FR step of finally boosting, open sequencing valve 1A, 2A, conversion gas enters adsorption tower A through pipeline G11, in adsorption tower A, adsorbent optionally adsorbs the water in the conversion gas successively, organic sulfur, component such as inorganic sulfur and carbon dioxide, Xi Fu partial CO 2 and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out through sequencing valve 2A from the port of export and enter the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, As time goes on, adsorbent water, the total amount of component such as organic sulfur and inorganic sulfur and carbon dioxide constantly increases, when the adsorbents adsorb said components is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1A, 2A, gas concentration lwevel is controlled at 10~15% (V) in working off one's feeling vent one's spleen.
(2) the equal voltage drop step in the two ends first time is called for short two ends one and all falls 2E1D '
After absorption finishes, open sequencing valve 3A, 3C, 7A and 7C, the gas in the A tower enters the C tower through pipeline G13 and G17 the C tower is carried out boost pressure in two ends (being called for short 2E1R '), after A and C pressure tower are in a basic balance, closes sequencing valve 3A, 7C.
(3) the equal voltage drop step in the two ends second time is called for short two ends two and all falls 2E2D '
After 2E1D ' end all falls in two ends one, open sequencing valve 4A, 4D and 7D, gas in the A tower enters the D tower through pipeline G14 and G17 the D tower is carried out two ends secondary boost pressure (being called for short 2E2R '), after A and D pressure tower are in a basic balance, closes sequencing valve 4D, 7A and 7D.
(4) the equal voltage drop step in two ends for the third time is called for short two ends three and all falls 2E3D '
After 2E2D ' end all falls in two ends two, open sequencing valve 4E, 8A and 8E, gas in the A tower enters the E tower through pipeline G14 and G18 the E tower is carried out three boost pressures in two ends (being called for short 2E3R '), after A and E pressure tower are in a basic balance, closes sequencing valve 4A, 4E and 8E.
(5) the 4th equal voltage drop step in two ends are called for short two ends four and all fall 2E4D '
After 2E3D ' end all falls in two ends three, open sequencing valve 5A, 5F and 8F, gas in the A tower enters the F tower through pipeline G15 and G18 the F tower is carried out four boost pressures in two ends (being called for short 2E4R '), after A and F pressure tower are in a basic balance, closes sequencing valve 5F, 8A and 8F.
(6) the 5th equal voltage drop step in two ends are called for short two ends five and all fall 2E5D '
After 2E4D ' end all falls in two ends four, open sequencing valve 5G, 11A and 11G, gas in the A tower enters the G tower through pipeline G15 and G111 the G tower is carried out five boost pressures in two ends (being called for short 2E5R '), after A and G pressure tower are in a basic balance, closes sequencing valve 5A, 5G and 11G.
(7) the 6th equal voltage drop step in two ends are called for short two ends six and all fall 2E6D '
After 2E5D ' end all falls in two ends five, open sequencing valve 6A, 6H and 11H, gas in the A tower enters the H tower through pipeline G16 and G111 the H tower is carried out six boost pressures in two ends (being called for short 2E6R '), after A and H pressure tower are in a basic balance, closes sequencing valve 6H, 11A and 11H.
(8) the 7th equal voltage drop step in two ends are called for short two ends seven and all fall 2E7D '
After 2E6D ' end all falls in two ends six, open sequencing valve 6I, 13A and 13I, gas in the A tower enters the I tower through pipeline G16 and G113 the I tower is carried out seven boost pressures in two ends (being called for short 2E7R '), after A and I pressure tower are in a basic balance, closes sequencing valve 6A, 6I and 13I.
(9) the 8th equal voltage drop step in two ends are called for short two ends eight and all fall 2E8D '
After 2E7D ' end all falls in two ends seven, open sequencing valve 12A, 12J and 13J, gas in the A tower enters the J tower through pipeline G112 and G113 the J tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and J pressure tower are in a basic balance, closes sequencing valve 12J, 13A and 13J.
(10) the 9th equal voltage drop step in two ends are called for short two ends nine and all fall 2E9D '
After 2E8D ' end all falls in two ends eight, open sequencing valve 12K, 9A and 9K, gas in the A tower enters the K tower through pipeline G112 and G19 the K tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and K pressure tower are in a basic balance, closes sequencing valve 12A, 12K and 9K.
(11) product carbon dioxide step-down D
After 2E9D ' end all falls in two ends nine, open sequencing valve KV-14a earlier, product carbon dioxide intermediate buffering jar V2 is put in product carbon dioxide step-down in the A tower, when the pressure of A tower during near V2 pressure, close sequencing valve KV14a, open sequencing valve KV14 again, product carbon dioxide buffer jar V3 is put in the product carbon dioxide step-down in the A tower, when the pressure of A tower during, close sequencing valve KV-14 near V3 pressure.
(12) three sections gas lifts are pressed 3ER
Product carbon dioxide step-down D opens sequencing valve 10A, KV-18 after finishing, and the gas in the surge tank V7 enters the A tower A tower is boosted, and after the pressure of surge tank V7 and adsorption tower A is in a basic balance, boosts after the end, closes sequencing valve 10A and KV-18.
(13) the 9th equal voltage rise steps in two ends are called for short two ends nine and all rise 2E9R '
After three sections gas lifts press 3ER to finish, open sequencing valve 12A, 12B, 9A and 9B, gas in the B tower enters the A tower through pipeline G112 and G19 the A tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and R pressure tower are in a basic balance, closes sequencing valve 12B, 9A and 9B.
(14) the 8th equal voltage rise steps in two ends are called for short two ends eight and all rise 2E8R '
After two ends nine all rise 2E9R ' end, open sequencing valve 12C, 13A and 13C, gas in the C tower enters the A tower through pipeline G112 and G113 the A tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and C pressure tower are in a basic balance, closes sequencing valve 12A, 12C and 13C.
(15) the 7th equal voltage rise steps in two ends are called for short two ends seven and all rise 2E7R '
After two ends eight all rise 2E8R ' end, open sequencing valve 6A, 6D and 13D, gas in the D tower enters the A tower through pipeline G16 and G113 the A tower is carried out seven boost pressures in two ends (being called for short 2E7R '), after A and D pressure tower are in a basic balance, closes sequencing valve 6D, 13A and 13D.
(16) the 6th equal voltage rise steps in two ends are called for short two ends six and all rise 2E6R '
After two ends seven all rise 2E7R ' end, open sequencing valve 6E, 11A and 11E, gas in the E tower enters the A tower through pipeline G16 and G111 the A tower is carried out six boost pressures in two ends (being called for short 2E6R '), after A and E pressure tower are in a basic balance, closes sequencing valve 6A, 6E and 11E.
(17) the 5th equal voltage rise steps in two ends are called for short two ends five and all rise 2E5R '
After two ends six all rise 2E6R ' end, open sequencing valve 5A, 5F and 11F, gas in the F tower enters the A tower through pipeline G15 and G111 the A tower is carried out five boost pressures in two ends (being called for short 2E5R '), after A and F pressure tower are in a basic balance, closes sequencing valve 5F, 11A and 11F.
(18) the 4th equal voltage rise steps in two ends are called for short two ends four and all rise 2E4R '
After two ends five all rise 2E5R ' end, open sequencing valve 5G, 7A and 7G, gas in the G tower enters the A tower through pipeline G15 and G17 the A tower is carried out four boost pressures in two ends (being called for short 2E4R '), after A and G pressure tower are in a basic balance, closes sequencing valve 5A, 5G and 7G.
(19) the equal voltage rise step in two ends for the third time is called for short two ends three and all rises 2E3R '
After two ends four all rise 2E4R ' end, open sequencing valve 4A, 4H and 7H, gas in the I tower enters the A tower through pipeline G14 and G17 the A tower is carried out three boost pressures in two ends (being called for short 2E3R '), after A and H pressure tower are in a basic balance, closes sequencing valve 4H, 7A and 7H.
(20) the equal voltage rise step in the two ends second time is called for short two ends two and all rises 2E2R '
After two ends three all rise 2E3R ' end, open sequencing valve 4I, 8A and 8I, gas in the I tower enters the A tower through pipeline G14 and G18 the A tower is carried out two ends secondary boost pressure (being called for short 2E2R '), after A and I pressure tower are in a basic balance, closes sequencing valve 4A, 4I and 8I.
(21) the equal voltage rise step in the two ends first time is called for short two ends one and all rises 2E1R '
After two ends two all rise 2E2R ' end, open sequencing valve 3A, 3K and 8K, gas in the K tower enters the A tower through pipeline G13 and G18 the A tower is carried out boost pressure in two ends (being called for short 2E1R '), after A and K pressure tower are in a basic balance, closes sequencing valve 3K, 8A and 8K.
(22) FR that finally boosts
Sequencing valve KV-12 is opened after all rising 2E1R ' end in two ends one, utilizes the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boosts from the top to the A tower, when the A pressure tower rises near adsorptive pressure, closes sequencing valve KV-12,3A.Also can be with unstripped gas to the A tower FR that finally boosts.
So far, the A tower has been finished a circulation, can enter next circulation again.B~L adsorption tower is the same with the circulation step of A tower, just staggers mutually on the time, sees Fig. 9 and Figure 12.
Be example with a tower now, contrast Figure 10 illustrates the processing step of the present embodiment second stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the a tower has been finished the FR step of finally boosting, open sequencing valve 1a, 2a, middle gaseous mixture enters adsorption tower a through pipeline G21, in a adsorption tower, adsorbent optionally adsorbs the components such as carbon dioxide of first stage pressure swing adsorption apparatus in working off one's feeling vent one's spleen, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out the compression section that enters synthetic ammonia from the port of export through sequencing valve 2a, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, the gas concentration lwevel of working off one's feeling vent one's spleen is controlled at below 0.2% (V), closes sequencing valve 1a, 2a stops air inlet, this moment, absorption finished, and closed sequencing valve 1a, 2a.
(2) for the first time equal voltage drop step is called for short one and all falls E1D
After absorption A finishes, open sequencing valve 3a, 3c, the gas in a tower enters the c tower through pipeline G23 to carry out one to the c tower and all rises, and after a and c pressure tower are in a basic balance, closes sequencing valve 3a.
(3) for the second time equal voltage drop step is called for short two and all falls E2D
One all falls after E1D finishes, and opens sequencing valve 4a, 4d, and the gas in a tower enters the d tower through pipeline G24 to carry out two to the d tower and all rise, and after a and d pressure tower are in a basic balance, closes sequencing valve 4d.
(4) equal for the third time voltage drop step is called for short three and all falls E3D
Two all fall after E2D finishes, and open sequencing valve 4e, and the gas in a tower enters the e tower through pipeline G24 to carry out three to the e tower and all rise, and after a and e pressure tower are in a basic balance, close sequencing valve 4a.
(5) the 4th equal voltage drop step are called for short four and all fall E4D
Three all fall after E3D finishes, and open sequencing valve 5a, 5f, and the gas in a tower enters the f tower through pipeline G25 to carry out four to the f tower and all rise, and after a and f pressure tower are in a basic balance, close sequencing valve 5f.
(6) the 5th equal voltage drop step are called for short five and all fall E5D
Four all fall after E4D finishes, and open sequencing valve 5g, and the gas in a tower enters the g tower through pipeline G26 to carry out five to the g tower and all rise, and after a and g pressure tower are in a basic balance, close sequencing valve 5a and 5g.
(7) the 6th equal voltage drop step are called for short six and all fall E4D
Five all fall after E5D finishes, and open sequencing valve 6a, 6h, and the gas in a tower enters the h tower through pipeline G26 to carry out six to the h tower and all rise, and after a and h pressure tower are in a basic balance, close sequencing valve 6h.
(8) the 7th equal voltage drop step are called for short seven and all fall E7D
Six all fall after E6D finishes, and open sequencing valve 6i, and the gas in a tower enters the i tower through pipeline G26 to carry out seven to the i tower and all rise, and after a and i pressure tower are in a basic balance, close sequencing valve 6a and 6i.
(9) the contrary BD of putting
Seven all fall after E7D finishes, open sequencing valve 7a, put into the adsorption tower inlet that the 3rd stage pressure swing adsorption apparatus is in adsorption step with the gas in a tower is reverse, when the gas in a tower drops to the 3rd stage pressure swing adsorption apparatus adsorption tower adsorptive pressure, close sequencing valve 7a.
(10) vacuumize VC
Contrary put BD and finish after, open sequencing valve 8a, the gas in the tower is released from a tower bottom through pipeline G27, vavuum pump P2 and puts into the adsorption tower inlet that the 3rd stage pressure swing adsorption apparatus is in adsorption step, vacuumize end after, close sequencing valve 8a.
(11) the 7th equal voltage rise steps are called for short seven and all rise E7R
Vacuumize after VC finishes, open sequencing valve 6a, 6c, the gas in the c tower enters a tower through pipeline G26 to carry out seven to a tower and all rises, and after c and a pressure tower are in a basic balance, closes sequencing valve 6c.
(11) the 6th equal voltage rise steps are called for short six and all rise E6R
Seven all rise E7R finish after, open sequencing valve 6d, the gas in the d tower enters a tower through pipeline G26 to carry out six to a tower and all rises, and after d and a pressure tower are in a basic balance, closes sequencing valve 6a, 6d.
(12) the 5th equal voltage rise steps are called for short five and all rise E5R
Five all rise E5R finish after, open sequencing valve 5a, 5e, the gas in the e tower enters a tower through pipeline G25 to carry out five to a tower and all rises, and after e and a pressure tower are in a basic balance, closes sequencing valve 5e.
(13) the 4th equal voltage rise steps are called for short four and all rise E4R
Five all rise E5R finish after, open sequencing valve 5f, the gas in the f tower enters a tower through pipeline G25 to carry out four to a tower and all rises, and after f and a pressure tower are in a basic balance, closes sequencing valve 5a, 5f.
(14) equal for the third time voltage rise step is called for short three and all rises E3R
Four all rise E4R finish after, open sequencing valve 4a, 4g, the gas in the g tower enters a tower through pipeline G24 to carry out three to a tower and all rises, and after g and a pressure tower are in a basic balance, closes sequencing valve 4g.
(15) for the second time equal voltage rise step is called for short two and all rises E2R
Three all rise E3R finish after, open sequencing valve 4h, the gas in the h tower enters a tower through pipeline G24 to carry out two to a tower and all rises, and after h and a pressure tower are in a basic balance, closes sequencing valve 4h, 4a.
(16) for the first time equal voltage rise step is called for short one and all rises E1R
Two all rise E2R finish after, open sequencing valve 3a, 3i, the gas in the i tower enters a tower through pipeline G23 to carry out one to a tower and all rises, and after i and a pressure tower are in a basic balance, closes sequencing valve 3i.
(17) FR that finally boosts
One all rises E1R finish after, open sequencing valve KV-16, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost from the top to a tower, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-16,3a.
So far, a tower has been finished a circulation, can enter next circulation again.B~j adsorption tower is the same with the circulation step of a tower, just staggers mutually on the time, sees Figure 10 and Figure 12.
Be example with a ' tower now, contrast Figure 11 and Figure 12 illustrate the processing step of present embodiment the 3rd stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, a ' tower has been finished the R step of boosting, open sequencing valve 1a ', 2a ', the second stage pressure swing adsorption apparatus adsorption tower is in the contrary mist of putting the BD step and vacuumizing the VC step and enters adsorption tower a ' through G31, in a ' adsorption tower, adsorbent optionally is absorbed into the components such as carbon dioxide in the implication, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen enter surge tank V7 from the port of export through sequencing valve 2a ' outflow, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1a ', 2a ', gas concentration lwevel is controlled at below 45% (V) in working off one's feeling vent one's spleen.Adsorptive pressure is in the 0.02MPa scope, also mist can be pressurized to more and send into the adsorption tower that the 3rd stage pressure swing adsorption apparatus is in adsorption step after the high pressure.
(2) vacuumize VC
After absorption A finishes, open sequencing valve 4a ', the carbon dioxide in the tower being released from a ' tower bottom through pipeline G34, vavuum pump P3 enters product carbon dioxide gas holder V, vacuumize end after, close sequencing valve 4a '.
(3) R that boosts
After vacuumizing the VC end, open sequencing valve 3a ' and KV-17, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-17 and 3a ' from the top to a tower.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery be greater than 99.9% (V), in product hydrogen, the nitrogen gas concentration lwevel less than 0.2% (V), ton ammonia power consumption 15~20.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 4:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 1 are in full accord, the adsorptive pressure of present embodiment is 3.0MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
As shown in figure 16, adsorption tower A~K is totally 11 composition first stage pressure swing adsorption apparatus, and the adsorbent that loads from down to up in the adsorption tower is followed successively by activated alumina and Kiselgel A, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, moves single tower absorption and all presses program seven times, utilizes vacuum pipeline G27 that adsorption tower is vacuumized by vavuum pump P2; Adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus, and the adsorbent of filling is a Kiselgel A in the adsorption tower, and when containing vaporous water in the inlet gas, the adsorbent of filling is activated alumina and Kiselgel A in the adsorption tower.V is the first stage pressure swing adsorption apparatus product carbon dioxide gas holder, and P2 and P3 are respectively second section and the 3rd stage pressure swing adsorption apparatus vavuum pump.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
Conversion gas enters the adsorption tower that first stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower optionally adsorbs the components such as water, organic sulfur, inorganic sulfur and carbon dioxide in the conversion gas successively, components such as the carbon monoxide of Xi Fu partial CO 2 and difficult absorption, methane, nitrogen, hydrogen are not discharged from the port of export and are entered the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, adsorbent in the adsorption tower is absorbing carbon dioxide optionally, and components such as the carbon monoxide of difficult absorption, methane, nitrogen, hydrogen are discharged from the port of export and entered compression section.The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that product carbon dioxide step-down D step obtains, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product wherein also contains a spot of carbon monoxide and methane.The adsorption tower of the 3rd stage pressure swing adsorption apparatus in a cycle period successively experience absorption A, vacuumize VC, the R pressure swing adsorption technique step of boosting.Be example with the A tower now, contrast Figure 13 and Figure 16 illustrate the processing step of the present embodiment first stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the A tower has been finished the FR step of finally boosting, open sequencing valve 1A, 2A, conversion gas enters adsorption tower A through pipeline G11, in adsorption tower A, adsorbent optionally adsorbs the water in the conversion gas successively, organic sulfur, component such as inorganic sulfur and carbon dioxide, Xi Fu partial CO 2 and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out through sequencing valve 2A from the port of export and enter the adsorption tower that second stage pressure swing adsorption apparatus is in adsorption step, As time goes on, adsorbent water, the total amount of component such as organic sulfur and inorganic sulfur and carbon dioxide constantly increases, when the adsorbents adsorb said components is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1A, 2A, gas concentration lwevel is controlled at 10~13% (V) in working off one's feeling vent one's spleen.
(2) for the first time equal voltage drop step is called for short one and all falls E1D
After absorption finishes, open sequencing valve 3A and 3C, the gas in the A tower enters the C tower through pipeline G13 the C tower is carried out a boost pressure (being called for short E1R), after A and C pressure tower are in a basic balance, closes sequencing valve 3A.
(3) for the second time equal voltage drop step is called for short two and all falls E2D
One all falls after E1D finishes, and opens sequencing valve 4A and 4D, and the gas in the A tower enters the D tower through pipeline G14 the D tower is carried out secondary boost pressure (being called for short E2R), after A and D pressure tower are in a basic balance, closes sequencing valve 4D.
(4) equal for the third time voltage drop step is called for short three and all falls E3D
Two all fall after E2D finishes, and open sequencing valve 4E, and the gas in the A tower enters the E tower through pipeline G14 the E tower is carried out three boost pressures (being called for short E3R), after A and E pressure tower are in a basic balance, close sequencing valve 4A and 4E.
(5) the 4th equal voltage drop step are called for short four and all fall E4D
Three all fall after E3D finishes, and open sequencing valve 5A and 5F, and the gas in the A tower enters the F tower through pipeline G15 the F tower is carried out four boost pressures (being called for short E4R), after A and F pressure tower are in a basic balance, close sequencing valve 5F.
(6) the 5th equal voltage drop step are called for short five and all fall E5D
Four all fall after E4D finishes, and open sequencing valve 5G, and the gas in the A tower enters the G tower through pipeline G15 the G tower is carried out five boost pressures (being called for short E5R), after A and G pressure tower are in a basic balance, close sequencing valve 5A and 5G.
(7) the 6th equal voltage drop step are called for short six and all fall E6D
Five all fall after E5D finishes, and open sequencing valve 6A and 6H, and the gas in the A tower enters the H tower through pipeline G16 the H tower is carried out six boost pressures (being called for short E6R), after A and H pressure tower are in a basic balance, close sequencing valve 6H.
(8) the 7th equal voltage drop step are called for short seven and all fall E7D
Six all fall after E6D finishes, and open sequencing valve 6I, and the gas in the A tower enters the I tower through pipeline G16 the I tower is carried out seven boost pressures (being called for short E7R), after A and I pressure tower are in a basic balance, close sequencing valve 6A and 6I.
(9) the 8th equal voltage drop step in two ends are called for short two ends eight and all fall 2E8D '
Seven all fall after E7D finishes, and open sequencing valve 7A, 7J, 8A and 8J, and the gas in the A tower enters the J tower through pipeline G17 and G18 the J tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and J pressure tower are in a basic balance, close sequencing valve 7J and 8J.
(10) the 9th equal voltage drop step in two ends are called for short two ends nine and all fall 2E9D '
After 2E8D ' end all falls in two ends eight, open sequencing valve 7K and 8K, gas in the A tower enters the K tower through pipeline G17 and G18 the K tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and K pressure tower are in a basic balance, closes sequencing valve 7A, 7K, 8A and 8K.
(11) product carbon dioxide step-down D
After 2E9D ' end all falls in two ends nine, open sequencing valve 9A and KV-14a earlier, product carbon dioxide intermediate buffering jar V2 is put in product carbon dioxide step-down in the A tower, when the pressure of A tower during near V2 pressure, close sequencing valve KV14a, open sequencing valve KV14 again, product carbon dioxide buffer jar V3 is put in the product carbon dioxide step-down in the A tower, when the pressure of A tower during, close sequencing valve KV-14 and 9A near V3 pressure.
(12) three sections gas lifts are pressed 3ER
Product carbon dioxide step-down D opens sequencing valve 10A, KV-18 after finishing, and the gas in the surge tank V7 enters the A tower A tower is boosted, and after the pressure of surge tank V7 and adsorption tower A is in a basic balance, boosts after the end, closes sequencing valve 10A and KV-18.
(13) the 9th equal voltage rise steps in two ends are called for short two ends nine and all rise 2E9R '
After product carbon dioxide step-down D finishes, open sequencing valve 7A, 7B, 8A and 8B, gas in the B tower enters the A tower through pipeline G18 and G17 the A tower is carried out nine boost pressures in two ends (being called for short 2E9R '), after A and B pressure tower are in a basic balance, closes sequencing valve 7B and 8B.
(14) the 8th equal voltage rise steps in two ends are called for short two ends eight and all rise 2E8R '
After two ends nine all rise 2E9R ' end, open sequencing valve 7C and 8C, gas in the C tower enters the A tower through pipeline G17 and G18 the A tower is carried out eight boost pressures in two ends (being called for short 2E8R '), after A and C pressure tower are in a basic balance, close sequencing valve 7A,, 7C, 8A and 8C.
(15) the 7th equal voltage rise steps are called for short seven and all rise E7R
Sequencing valve 6A and 6D are opened after all rising 2E8R ' end in two ends eight, and the gas in the D tower enters the A tower through pipeline G16 the A tower is carried out seven boost pressures (being called for short E7R), after A and D pressure tower sill balance, closes sequencing valve 6D.
(16) the 6th equal voltage rise steps are called for short six and all rise E6R
Seven all rise E7R finish after, open sequencing valve 6E, the gas in the E tower enters the A tower through pipeline G16 the A tower is carried out six boost pressures (being called for short E6R), after A and E pressure tower are in a basic balance, closes sequencing valve 6A and 6E.
(17) the 5th equal voltage rise steps are called for short five and all rise E5R
Six all rise E6R finish after, open sequencing valve 5A and 5F, the gas in the F tower enters the A tower through pipeline G15 the A tower is carried out five boost pressures (being called for short E5R), after A and F pressure tower are in a basic balance, closes sequencing valve 5F.
(18) the 4th equal voltage rise steps are called for short four and all rise E4R
Five all rise E5R finish after, open sequencing valve 5G, the gas in the G tower enters the A tower through pipeline G15 the A tower is carried out four boost pressures (being called for short E4R), after A and G pressure tower are in a basic balance, closes sequencing valve 5A and 5G.
(19) equal for the third time voltage rise step is called for short three and all rises E3R
Four all rise E4R finish after, open sequencing valve 4A and 4H, the gas in the H tower enters the A tower through pipeline G14 the A tower is carried out three boost pressures (being called for short E3R), after A and H pressure tower are in a basic balance, closes sequencing valve 4H.
(20) for the second time equal voltage rise step is called for short two and all rises E2R
Three all rise E3R finish after, open sequencing valve 4I, the gas in the I tower enters the A tower through pipeline G14 the A tower is carried out secondary boost pressure (being called for short E2R), after A and I pressure tower are in a basic balance, closes sequencing valve 4A and 4I.
(21) for the first time equal voltage rise step is called for short one and all rises E1R
Two all rise E2R finish after, open sequencing valve 3A and 3J, the gas in the J tower enters the A tower through pipeline G13 the A tower is carried out boost pressure in two ends (being called for short E1R), after A and J pressure tower are in a basic balance, closes sequencing valve 3J.
(22) FR that finally boosts
One all rises E1R finish after, open sequencing valve KV-12, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost from the top to the A tower, when the A pressure tower rises near adsorptive pressure, close sequencing valve KV-12,3A.Also can be with unstripped gas to the A tower FR that finally boosts.So far, the A tower has been finished a circulation, can enter next circulation again.B~K adsorption tower is the same with the circulation step of A tower, just staggers mutually on the time, sees Figure 13 and Figure 16.
Be example with a tower now, contrast Figure 14 and Figure 16 illustrate the processing step of the present embodiment second stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, the a tower has been finished the FR step of finally boosting, open sequencing valve 1a, 2a, middle gaseous mixture enters adsorption tower a through pipeline G21, in a adsorption tower, adsorbent optionally adsorbs the components such as carbon dioxide of first stage pressure swing adsorption apparatus in working off one's feeling vent one's spleen, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen flow out the compression section that enters synthetic ammonia from the port of export through sequencing valve 2a, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, the gas concentration lwevel of working off one's feeling vent one's spleen is controlled at below 0.2% (V), closes sequencing valve 1a, 2a stops air inlet, this moment, absorption finished, and closed sequencing valve 1a, 2a.
(2) for the first time equal voltage drop step is called for short one and all falls E1D
After absorption A finishes, open sequencing valve 3a, 3c, the gas in a tower enters the c tower through pipeline G23 to carry out one to the c tower and all rises, and after a and c pressure tower are in a basic balance, closes sequencing valve 3a.
(3) for the second time equal voltage drop step is called for short two and all falls E2D
One all falls after E1D finishes, and opens sequencing valve 4a, 4d, and the gas in a tower enters the d tower through pipeline G24 to carry out two to the d tower and all rise, and after a and d pressure tower are in a basic balance, closes sequencing valve 4d.
(4) equal for the third time voltage drop step is called for short three and all falls E3D
Two all fall after E2D finishes, and open sequencing valve 4e, and the gas in a tower enters the e tower through pipeline G24 to carry out three to the e tower and all rise, and after a and e pressure tower are in a basic balance, close sequencing valve 4a.
(5) the 4th equal voltage drop step are called for short four and all fall E4D
Three all fall after E3D finishes, and open sequencing valve 5a, 5f, and the gas in a tower enters the f tower through pipeline G25 to carry out four to the f tower and all rise, and after a and f pressure tower are in a basic balance, close sequencing valve 5f.
(6) the 5th equal voltage drop step are called for short five and all fall E5D
Four all fall after E4D finishes, and open sequencing valve 5g, and the gas in a tower enters the g tower through pipeline G26 to carry out five to the g tower and all rise, and after a and g pressure tower are in a basic balance, close sequencing valve 5a and 5g.
(7) the 6th equal voltage drop step are called for short six and all fall E4D
Five all fall after E5D finishes, and open sequencing valve 6a, 6h, and the gas in a tower enters the h tower through pipeline G26 to carry out six to the h tower and all rise, and after a and h pressure tower are in a basic balance, close sequencing valve 6h.
(8) the 7th equal voltage drop step are called for short seven and all fall E7D
Six all fall after E6D finishes, and open sequencing valve 6i, and the gas in a tower enters the i tower through pipeline G26 to carry out seven to the i tower and all rise, and after a and i pressure tower are in a basic balance, close sequencing valve 6a and 6i.
(9) the contrary BD of putting
Seven all fall after E7D finishes, open sequencing valve 7a, put into the adsorption tower inlet that the 3rd stage pressure swing adsorption apparatus is in adsorption step with the gas in a tower is reverse, when the gas in a tower drops to the 3rd stage pressure swing adsorption apparatus adsorption tower adsorptive pressure, close sequencing valve 7a.
(10) vacuumize VC
Contrary put BD and finish after, open sequencing valve 8a, the gas in the tower is released from a tower bottom through pipeline G27, vavuum pump P2 and puts into the adsorption tower inlet that the 3rd stage pressure swing adsorption apparatus is in adsorption step, vacuumize end after, close sequencing valve 8a.
(11) the 7th equal voltage rise steps are called for short seven and all rise E7R
Vacuumize after VC finishes, open sequencing valve 6a, 6c, the gas in the c tower enters a tower through pipeline G26 to carry out seven to a tower and all rises, and after c and a pressure tower are in a basic balance, closes sequencing valve 6c.
(11) the 6th equal voltage rise steps are called for short six and all rise E6R
Seven all rise E7R finish after, open sequencing valve 6d, the gas in the d tower enters a tower through pipeline G26 to carry out six to a tower and all rises, and after d and a pressure tower are in a basic balance, closes sequencing valve 6a, 6d.
(12) the 5th equal voltage rise steps are called for short five and all rise E5R
Five all rise E5R finish after, open sequencing valve 5a, 5e, the gas in the e tower enters a tower through pipeline G25 to carry out five to a tower and all rises, and after e and a pressure tower are in a basic balance, closes sequencing valve 5e.
(13) the 4th equal voltage rise steps are called for short four and all rise E4R
Five all rise E5R finish after, open sequencing valve 5f, the gas in the f tower enters a tower through pipeline G25 to carry out four to a tower and all rises, and after f and a pressure tower are in a basic balance, closes sequencing valve 5a, 5f.
(14) equal for the third time voltage rise step is called for short three and all rises E3R
Four all rise E4R finish after, open sequencing valve 4a, 4g, the gas in the g tower enters a tower through pipeline G24 to carry out three to a tower and all rises, and after g and a pressure tower are in a basic balance, closes sequencing valve 4g.
(15) for the second time equal voltage rise step is called for short two and all rises E2R
Three all rise E3R finish after, open sequencing valve 4h, the gas in the h tower enters a tower through pipeline G24 to carry out two to a tower and all rises, and after h and a pressure tower are in a basic balance, closes sequencing valve 4h, 4a.
(16) for the first time equal voltage rise step is called for short one and all rises E1R
Two all rise E2R finish after, open sequencing valve 3a, 3i, the gas in the i tower enters a tower through pipeline G23 to carry out one to a tower and all rises, and after i and a pressure tower are in a basic balance, closes sequencing valve 3i.
(17) FR that finally boosts
One all rises E1R finish after, open sequencing valve KV-16, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost from the top to a tower, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-16,3a.
So far, a tower has been finished a circulation, can enter next circulation again.B~j adsorption tower is the same with the circulation step of a tower, just staggers mutually on the time, sees Figure 13 and Figure 16.
Be example with a ' tower now, contrast Figure 14 and Figure 16 illustrate the processing step of present embodiment the 3rd stage pressure swing adsorption apparatus adsorption tower in a cyclic process:
(1) absorption A
At this moment, a ' tower has been finished the R step of boosting, open sequencing valve 1a ', 2a ', the second stage pressure swing adsorption apparatus adsorption tower is in the contrary mist of putting the BD step and vacuumizing the VC step and enters adsorption tower a ' through G31, in a ' adsorption tower, adsorbent optionally is absorbed into the components such as carbon dioxide in the implication, Xi Fu amounts of carbon dioxide and be difficult for the carbon monoxide of absorption not, methane, nitrogen, components such as hydrogen enter surge tank V7 from the port of export through sequencing valve 2a ' outflow, As time goes on, adsorbent total carbon dioxide capacity constantly increases, when the adsorbents adsorb carbon dioxide is saturated, stop air inlet, this moment, absorption finished, and closed sequencing valve 1a ', 2a ', gas concentration lwevel is controlled at below 45% (V) in working off one's feeling vent one's spleen.Adsorptive pressure is in the 0.02MPa scope, also mist can be pressurized to more and send into the adsorption tower that the 3rd stage pressure swing adsorption apparatus is in adsorption step after the high pressure.
(2) vacuumize VC
After absorption A finishes, open sequencing valve 4a ', the carbon dioxide in the tower being released from a ' tower bottom through pipeline G34, vavuum pump P3 enters product carbon dioxide gas holder V, vacuumize end after, close sequencing valve 4a '.
(3) R that boosts
After vacuumizing the VC end, open sequencing valve 3a ' and KV-17, utilize the adsorption tower that is in adsorption step to work off one's feeling vent one's spleen and boost, when a pressure tower rises to adsorptive pressure, close sequencing valve KV-17 and 3a ' from the top to a tower.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 10~15 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 3.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 5:
Condition such as the conversion gas composition of present embodiment, temperature, adsorbent kind, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 1 are in full accord, the adsorptive pressure of present embodiment is 0.7MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program 9 times; Adsorption tower a~g is totally 7 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program four times.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~g upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, vacuumize VC, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that product carbon dioxide step-down D step obtains, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, the contrary BD of putting, vacuumize VC, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product wherein also contains a spot of carbon monoxide and methane.The adsorption tower of the 3rd stage pressure swing adsorption apparatus in a cycle period successively experience absorption A, vacuumize VC, the R pressure swing adsorption technique step of boosting.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 50~60 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 0.7MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 3% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 6:
Condition such as the conversion gas composition of present embodiment, temperature, adsorbent kind, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 1 and 5 are in full accord, the adsorptive pressure of present embodiment is 0.7MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
Adsorption tower A~J is totally 10 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program 7 times; Adsorption tower a~g is totally 7 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program four times.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~g upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, gaseous mixture step-down D1, vacuumize VC, three sections gas lifts are pressed 3ER, two ends seven all rise 2E7R ', two ends six all rise 2E6R ', five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that product carbon dioxide step-down D step obtains, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, the contrary BD of putting, vacuumize VC, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product wherein also contains a spot of carbon monoxide and methane.The adsorption tower of the 3rd stage pressure swing adsorption apparatus in a cycle period successively experience absorption A, vacuumize VC, the R pressure swing adsorption technique step of boosting.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 50~60 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 0.7MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 7:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 3 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, and move single tower absorption and all press program nine times: adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program seven times.Adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, purge CP, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, purge gas is from the contrary gaseous mixture of putting BD of second stage pressure swing adsorption apparatus, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, vacuumize VC, the R pressure swing adsorption technique step of boosting.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 15~20 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 8:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 3 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program seven times, and adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, vacuumize VC, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls EID, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, purge gas is from the contrary gaseous mixture of putting BD of second stage pressure swing adsorption apparatus, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, vacuumize VC, the R pressure swing adsorption technique step of boosting.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 25~35 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 3% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 9:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 3 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program seven times, and adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, purge gas is from the contrary gaseous mixture of putting BD of second stage pressure swing adsorption apparatus, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, equal pressure drop ED, vacuumize VC, equal voltage rise ER, the R pressure swing adsorption technique step of boosting.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 15~20 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 10:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 3 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.005MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program seven times, and adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, purge gas is from the contrary gaseous mixture of putting BD of second stage pressure swing adsorption apparatus, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, displacement P, vacuumize VC, the displacement gas PR pressure swing adsorption technique step of boosting.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption 15~20 is spent.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 11:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 3 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.04MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program seven times, and adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, 2E1D ' all falls in two ends one, 2E2D ' all falls in two ends two, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two ends two all rise 2E2R ', two ends one all rise 2E1R ', the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, purge gas is from the contrary gaseous mixture of putting BD of second stage pressure swing adsorption apparatus, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly nitrogen, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, displacement P, vacuumize VC, the displacement gas PR pressure swing adsorption technique step of boosting.
First section pressure swing adsorption gas separation device is when product carbon dioxide step-down D step is carried out, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, put into product carbon dioxide buffer jar V3 again, put into gas holder V at last, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment, and the product carbon dioxide among the gas holder V is sent into product carbon dioxide buffer jar V3 by power-equipment.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption is saved 10~15 degree.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.
Embodiments of the invention 12:
Condition such as the conversion gas composition of present embodiment and temperature, adsorbent kind and ratio, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span and embodiment 11 are in full accord, the adsorptive pressure of present embodiment is 2.0MPa (G), and the discharge pressure of product carbon dioxide is 0.01MPa.
Adsorption tower A~L is totally 12 composition first stage pressure swing adsorption apparatus, moves single tower absorption and all presses program nine times; Adsorption tower a~j is totally 10 composition second stage pressure swing adsorption apparatus, moves single tower absorption and all presses program seven times, and adsorption tower a '~c ' is totally 3 composition the 3rd stage pressure swing adsorption apparatus.Present embodiment first stage pressure swing adsorption apparatus is purified to carbon dioxide more than 98.5% (V), be used for urea synthesis, the second stage pressure swing adsorption apparatus effect is that working off one's feeling vent one's spleen of first stage pressure swing adsorption apparatus further purified, make in the hydrogen, nitrogen of the second stage pressure swing adsorption apparatus adsorption tower a~j upper end outlet gas concentration lwevel less than 0.2% (V), to satisfy the needs of next step operation of synthetic ammonia.
The adsorption tower of first stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, 2E3D ' all falls in two ends three, 2E4D ' all falls in two ends four, 2E5D ' all falls in two ends five, 2E6D ' all falls in two ends six, 2E7D ' all falls in two ends seven, 2E8D ' all falls in two ends eight, 2E9D ' all falls in two ends nine, product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends nine all rise 2E9R ', two ends eight all rise 2E8R ', two ends seven all rise 2E7R ', two ends six all rise 2E6R ', two ends five all rise 2E5R ', two ends four all rise 2E4R ', two ends three all rise 2E3R ', two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, first stage pressure swing adsorption apparatus is the product carbon dioxide at the gas that vacuumizes the acquisition of VC step, the adsorption tower of second stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, one all falls E1D, two all fall E2D, three all fall E3D, four all fall E4D, five all fall E5D, six all fall E6D, seven all fall E7D, the contrary BD of putting, vacuumize VC, seven all rise E7R, six all rise E6R, five all rise E5R, four all rise E4R, three all rise E3R, two all rise E2R, one all rises E1R, the FR pressure swing adsorption technique step of finally boosting, purge gas is from the contrary gaseous mixture of putting BD of second stage pressure swing adsorption apparatus, the gaseous mixture that second stage pressure swing adsorption apparatus is in the adsorption tower outlet discharge of adsorption step is mainly ammonia, hydrogen product, wherein also contain a spot of carbon monoxide and methane, the adsorption tower of the 3rd stage pressure swing adsorption apparatus experiences absorption A successively in a cycle period, displacement P, vacuumize VC, the displacement gas PR pressure swing adsorption technique step of boosting.
First section pressure swing adsorption gas separation device is when product carbon dioxide step-down D step is carried out, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, put into product carbon dioxide buffer jar V3 again, put into gas holder V at last, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment, and the product carbon dioxide among the gas holder V is sent into product carbon dioxide buffer jar V3 by power-equipment.
The present embodiment result is 98.5% (V) for the product carbon dioxide purity, and carbon dioxide, hydrogen, nitrogen and the carbon monoxide rate of recovery are greater than 99.9% (V), and gas concentration lwevel is less than 0.2% (V) in product hydrogen, the nitrogen, and ton ammonia power consumption is saved 12~17 degree.
For present embodiment, adopt particular adsorbent combination of the present invention, under the identical situation of other condition (adsorptive pressure is 2.0MPa (G), conversion gas composition and temperature, sorption cycle time, power-equipment performance, instrument and meter and control function, special-purpose sequencing valve and hydraulic system structure and life-span), synthetic ammonia decarburization power consumption per ton on average descends 15%, the investment of decarburization original equipment can save 2.5%, and the overall recovery of hydrogen, nitrogen and carbon monoxide improves about 2% (V).According to the Ammonia Production arts demand, also can be with more than the hydrogen purification to 99.999% (V) in present embodiment second stage pressure swing adsorption apparatus.

Claims (18)

1, a kind of employing three stage pressure swing adsorption apparatus remove the method for carbon dioxide from conversion gas, it is characterized in that the method adopts the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the middle gaseous mixture of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends boost pressure 2ER ', the FR processing step finally boosts, second section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, drop pressure ED, the contrary BD of putting, vacuumize VC, boost pressure ER, the FR processing step that finally boosts, the 3rd section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, vacuumize VC, the R processing step boosts.
2, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 remove the method for carbon dioxide from conversion gas, it is characterized in that first section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A increases drop pressure ED afterwards and/or first section pressure swing adsorption gas separation device adsorption tower process cycles step two ends drop pressure 2ED ' increases gaseous mixture step-down D1 step afterwards.
3, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing purging CP step or vacuumizing the VC step after first section pressure swing adsorption gas separation device adsorption tower process cycles step product carbon dioxide step-down D.
4, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing recovery RG step after second section pressure swing adsorption gas separation device adsorption tower process cycles step drop pressure ED, increase by two sections gas lifts simultaneously and press the 2ER step after first section pressure swing adsorption gas separation device adsorption tower process cycles step 3 section gas lift pressed the 3ER step, above-mentioned second section pressure swing adsorption gas separation device adsorption tower reclaims between RG step and two sections gas lifts pressures of the first section pressure swing adsorption gas separation device adsorption tower 2ER step and is connected by surge tank V1.
5, a kind of employing three stage pressure swing adsorption apparatus according to claim 3 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing recovery RG step after second section pressure swing adsorption gas separation device adsorption tower process cycles step drop pressure ED, increase by two sections gas lifts simultaneously and press the 2ER step after first section pressure swing adsorption gas separation device adsorption tower process cycles step 3 section gas lift pressed the 3ER step, above-mentioned second section pressure swing adsorption gas separation device adsorption tower reclaims between RG step and two sections gas lifts pressures of the first section pressure swing adsorption gas separation device adsorption tower 2ER step and is connected by surge tank V1.
6, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing drop pressure ED step after the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, after vacuumizing the VC step, increase boost pressure ER step simultaneously.
7, a kind of employing three stage pressure swing adsorption apparatus according to claim 3 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing drop pressure ED step after the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, after vacuumizing the VC step, increase boost pressure ER step simultaneously.
8, a kind of employing three stage pressure swing adsorption apparatus according to claim 4 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing drop pressure ED step after the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, after vacuumizing the VC step, increase boost pressure ER step simultaneously.
9, a kind of employing three stage pressure swing adsorption apparatus according to claim 5 remove the method for carbon dioxide from conversion gas, it is characterized in that increasing drop pressure ED step after the 3rd section pressure swing adsorption gas separation device adsorption tower process cycles step absorption A step, after vacuumizing the VC step, increase boost pressure ER step simultaneously.
10, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, it is characterized in that in first section pressure swing adsorption gas separation device adsorption tower process cycles step, when product carbon dioxide step-down D step is carried out, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, put into product carbon dioxide buffer jar V3 again, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment.
11, a kind of employing three stage pressure swing adsorption apparatus according to claim 3 remove the method for carbon dioxide from conversion gas, it is characterized in that in first section pressure swing adsorption gas separation device adsorption tower process cycles step, when product carbon dioxide step-down D step is carried out, the product carbon dioxide is at first put into product carbon dioxide intermediate buffering jar V2, put into product carbon dioxide buffer jar V3 again, put into gas holder V at last, the gas of product carbon dioxide intermediate buffering jar V2 is put into product carbon dioxide buffer jar V3 by pressure or Flow-rate adjustment.
12, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, it is characterized in that the adsorbent that loads from down to up in the first stage pressure swing adsorption apparatus adsorption tower is activated alumina and Kiselgel A, the adsorbent of filling is Kiselgel A or molecular sieve in the second stage pressure swing adsorption apparatus adsorption tower, and the adsorbent of filling is Kiselgel A or activated alumina and Kiselgel A in the 3rd stage pressure swing adsorption apparatus adsorption tower.
13, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, the mean concentration that it is characterized in that carbon dioxide in the middle gaseous mixture of first stage pressure swing adsorption apparatus is 7~15V%, and the mean concentration of carbon dioxide was 30~60V% during the 3rd stage pressure swing adsorption apparatus was worked off one's feeling vent one's spleen; The adsorptive pressure of the 3rd stage pressure swing adsorption apparatus adsorption tower is gauge pressure 0.005~0.01Mpa.
14, a kind of employing three stage pressure swing adsorption apparatus according to claim 1 and 2 remove the method for carbon dioxide from conversion gas, the exit gas that it is characterized in that the 3rd stage pressure swing adsorption apparatus adsorption tower, when gas concentration lwevel be≤during 6V%, return first section and second section pressure swing adsorption gas separation device adsorption tower boosted.
15, a kind of employing three stage pressure swing adsorption apparatus remove the method for carbon dioxide from conversion gas, it is characterized in that the method adopts the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the middle gaseous mixture of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', vacuumize VC, three sections gas lifts are pressed 3ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, the contrary BD of putting, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
16, a kind of employing three stage pressure swing adsorption apparatus remove the method for carbon dioxide from conversion gas, it is characterized in that the method adopts the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the middle gaseous mixture of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the middle mist of the 3rd stage pressure swing adsorption apparatus adsorption tower all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two sections gas lifts are pressed 2ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, reclaim RG, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
17, a kind of employing three stage pressure swing adsorption apparatus remove the method for carbon dioxide from conversion gas, it is characterized in that the method adopts the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the middle gaseous mixture of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', vacuumize VC, three sections gas lifts are pressed 3ER, two sections gas lifts are pressed 2ER, two ends boost pressure 2ER ', the FR processing step that finally boosts, second section pressure swing adsorption gas separation device adsorption tower experience absorption A successively in a cycle period, drop pressure ED, reclaim RG, vacuumize VC, boost pressure ER, the FR processing step finally boosts., the 3rd section pressure swing adsorption gas separation device adsorption tower in a cycle period successively experience absorption A, vacuumize VC, the R processing step boosts.
18, a kind of employing three stage pressure swing adsorption apparatus remove the method for carbon dioxide from conversion gas, it is characterized in that the method adopts the operation of three stage pressure swing adsorption apparatus, conversion gas at first enters first section pressure swing adsorption gas separation device, carbon dioxide in the conversion gas partly is removed and carries the dense product carbon dioxide that is, the middle gaseous mixture that obtains from first section pressure swing adsorption gas separation device adsorption tower outlet enters second section pressure swing adsorption gas separation device, impurity absorption in the middle gaseous mixture is got off, the gas that is not adsorbed enters next workshop section as product gas, in first section pressure swing adsorption gas separation device except that the product carbon dioxide and enter all gas the middle gaseous mixture of second section pressure swing adsorption gas separation device and second section pressure swing adsorption gas separation device in all gas except that entering next workshop section's product gas enter the 3rd section pressure swing adsorption gas separation device, remove partial CO 2 wherein, the 3rd stage pressure swing adsorption apparatus adsorption tower exit gas all returns first section pressure swing adsorption gas separation device adsorption tower is boosted, first section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, two ends drop pressure 2ED ', product carbon dioxide step-down D, three sections gas lifts are pressed 3ER, two ends boost pressure 2ER ', the FR processing step finally boosts, second section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, drop pressure ED, the contrary BD of putting, vacuumize VC, boost pressure ER, the FR processing step finally boosts, the 3rd section pressure swing adsorption gas separation device adsorption tower experiences absorption A successively in a cycle period, displacement P, vacuumize VC, the displacement gas PR processing step that boosts, the adsorption tower of displacement P step is worked off one's feeling vent one's spleen another adsorption tower is boosted.
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