CN100588449C - Multiple placing in turn interleaving flushing pressure variable adsorption technique - Google Patents
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Abstract
The invention discloses a kind of pressure swing adsorption technique of multiple placing in turn interleaving flushing, two or many sequencing valves are set on four control valves that are interspersed, each adsorption tower top exit pipeline at least do being provided with on each adsorption tower top exit pipeline along discharge port valves and flushing inlet valve, to along putting and flushing process is regulated, realized that the order more than three times or three times along letting slip journey, reaches the inverted sequence turn interleaving flushing process of corresponding number of times.The present invention has increased the recovery time, has improved the desorption efficiency of impurity composition, has reduced the purge gas consumption, has improved product gas yield; Reduced absorption and divided cycle time, can reduce the investment of device and dwindle floor space.Avoided the suitable performance difference of putting the appearance of flushing process employing different adjustment valve of different adsorption towers simultaneously, make the in full accord of each adsorption tower of device along putting flushing process, avoided reducing the regeneration effect of whole device, thereby avoided reducing the integrated operation performance of device because of the performance difference of control valve.
Description
Technical field
The present invention relates to a kind of pressure swing absorption process, relate in particular to a kind of pressure swing adsorption technique of repeatedly putting turn interleaving flushing.
Background technology
Transformation absorption (Pressure Swing Adsorption is called for short PSA) method is meant and utilizes the porosu solid adsorbent under certain pressure that different component in the mist is had the characteristic of selective absorption, realizes the method that mist separates.Because this method has that technology is simple, scale is flexible, easy to operate, the automaticity height, therefore characteristics such as small investment, energy consumption are low, have obtained development fast since pressure swing adsorption is successfully developed, constantly trend towards ripe and perfect.Large scale development along with pressure-swing absorption apparatus, from early stage hundreds of mark sides/time product to tens thousand of mark sides/time product volume, particularly in recent years product tolerance reach hundreds thousand of mark sides/time the development of super-huge PSA device, guaranteeing under the product quality premise condition, the user is to product yield, investment and take up an area of more and more harshness of requirement, it is higher to the distribution of air-flow in bed and the requirement of flowing to add that the adsorption tower volume strengthens the back, and traditional pressure swing adsorption technique can't adapt to the requirement of pressure-swing absorption apparatus large scale development.In order to satisfy the requirement of pressure-swing absorption apparatus large scale development, the main at present research that launches pressure swing adsorption technique around following both direction: the one, improve service efficiency, and then improve the yield of product gas along venting; The 2nd, improve the utilization rate of adsorbent, divide cycle time thereby shorten absorption, reach the demand that reduces one-time investment and dwindle floor space.
The beginning of the nineties the domestic 10-3-4/P technology of having released, i.e. 10 adsorption towers, the charging simultaneously of 3 towers, 4 equal compression technologies, each step setting-up time is 45 seconds.This technology flushing part mainly puts the flushing sequencing valve by two alignments and two control valves are formed, and different towers carries out along putting the control valve of flushing when controlling identical.This technology is mainly used in the middle change gas purifying hydrogen of hydrogen technology under 2.5MPa (pressure described in the literary composition all the is gauge pressure) pressure except that indicating especially, time-scale sees Table 1.From time-scale as can be known, every adsorption tower experience absorption (A) successively in a cycle period, for the first time isostasy fall (E1D), for the second time isostasy fall (E2D), for the third time isostasy fall (E3D), the 4th isostasy fall (E4D), the first step along put (PP1), second step along put (PP2), contrary put (D), the second step flushing (P2), first step flushing (P1), the 4th isostasy liter (E4R), for the third time isostasy liter (E3R), for the second time isostasy liter (E2R), for the first time isostasy liter (E1R), (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.
Table 1:10-3-4/P technology time-scale
The method that this process using pressure is divided equally is to carrying out secondary splitting along venting, two sections that obtain different impurities content along venting, the regeneration adsorption tower is carried out the inverted sequence flushing, realized secondary placing in turn interleaving flushing process, being the second high step of impurity content is used for just finishing contrary flushing (P2) of putting the more relatively adsorption tower of (D) step, impurity content along venting (PP2), and the first step that impurity content is low is used for finishing the few relatively adsorption tower flushing (P1) of second step flushing (P2) impurity content along putting (PP1).This two step of process using placing in turn interleaving flushing makes that the adsorbent reactivation effect is relatively good, helps improving the product hydrogen yield, utilizes the middle change gas under 40 ℃ of this PROCESS FOR TREATMENT, the 2.5MPa pressure, and the yield of product hydrogen reaches 89%.But twice of this technology needed more than 90 seconds along the time that puts flushing regeneration, for guaranteeing along the time that puts flushing, absorption (A) total time minimum needs 270 seconds.This consumption that just means adsorption tower volume and adsorbent increases, and investment and floor space increase.Simultaneously because the configuration of this flow process has determined this flow process to be difficult to realize more frequently along putting rinsing step.
Because this employing pressure is divided equally the method for cutting apart along venting, be difficult to the impurity content of control along venting, the gained impurity concentration gradients along venting at different levels are not equal difference (according to the difference of handling gas, sometimes one, two, three along the venting component very approaching, three, level Four along the venting component differ greatly; Sometimes one-level and secondary differ bigger along the component of venting, and two, three and level Four along the venting component very approaching), so if the method that adopts pressure to divide equally is carried out the inverted sequence flushing to the back of cutting apart of carrying out along venting more than three times or three times to the regeneration adsorption tower, the regeneration effect of adsorbent is unsatisfactory, is difficult to reach than the better effect of secondary splitting.And need bigger adsorption tower volume and adsorbent consumption cutting apart and turn interleaving flushing more than three times or three times, investment and the also corresponding increase of floor space.
Application number is that the Chinese patent of 200510020305.x discloses the secondary placing in turn interleaving flushing technology of a kind of 10-3-4/P with two downflow releasing tanks, i.e. 10 adsorption towers, the charging simultaneously of 3 towers, 4 equal compression technologies, cushion by two downflow releasing tanks along letting slip journey, each step time has been dropped to 30 seconds.This technology flushing part is mainly put flushing sequencing valve and four control valves and two by two alignments and is formed along putting surge tank, and different towers carries out the different control valve of use when putting flushing control, and this technology time-scale sees Table 2.
Table 2: with the 10-3-4/P technology time-scale of two downflow releasing tanks
The method that this process using pressure is divided equally is to carrying out cutting apart for twice along venting, two sections that obtain different impurities content along venting, gained is stored in downflow releasing tank along venting, the suitable venting that utilizes downflow releasing tank to store is again carried out the inverted sequence flushing to the regeneration adsorption tower, realized secondary placing in turn interleaving flushing process, be the second high step of impurity content to be used for just finishing contrary (D) step of putting along venting (PP2), the flushing of the adsorption tower that impurity content is more relatively (P2), the first step that impurity content is low is used for finishing the few relatively adsorption tower flushing (P1) of second step flushing (P2) impurity content along putting (PP1).This technology utilization downflow releasing tank is realized making adsorbent reactivation relatively good along the turn interleaving flushing of venting, helps improving the product hydrogen yield, handles 40 ℃, the middle change gas under the 2.5MPa pressure, and the yield of product hydrogen reaches 90%.Because this process using downflow releasing tank stores along venting, can under the prerequisite that guarantees the same recovery time, can shorten along putting the time, thereby can shorten adsorption time, reduce the total amount of the volume and the adsorbent of adsorption tower.Increased the equipment investment and the corresponding floor space of sequencing valve and downflow releasing tank but then again, different towers carries out using different control valves along putting when flushing is controlled, and makes that the regeneration effect of each tower of device is slightly variant.And the method that this technology still adopts pressure to divide equally is cut apart along venting, guarantee the flushing recovery time more than 90 seconds, the suitable time of putting has dropped to 30 seconds, simultaneously must be divided into secondary again finishes, each step time can't reduce again, thereby be difficult to realize three times or, just can't reach better regeneration effect with the placing in turn interleaving flushing process of last time.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of product gas yield height, equipment investment is few, floor space is little multiple placing in turn interleaving flushing pressure variable adsorption technique are provided.
In order to solve the problems of the technologies described above, pressure swing adsorption system of the present invention is that system is transfered from one department to another in multi-tower continuous reforwarding, each adsorption tower experiences absorption (A), all pressure drops (ED), suitable (PP), reverse pressure (D), flushing (P), equal voltage rise (ER), (FR) process of finally boosting of putting of putting successively in a cycle period, it is characterized in that, described being divided into more than three times or three times along the suitable bleed air exhaust process in strideing suddenly finished, and each time is equal difference along the impurity composition concentration of exitting and increases progressively distribution; The flushing process of described rinsing step is divided into and finishes along letting slip the corresponding number of times of journey, utilize successively along the at different levels of the rapid discharging of strideing and the regeneration adsorption tower is carried out normal pressure inverted sequence turn interleaving flushing along venting, it is the highest flushing that is used for just finishing the contrary adsorption tower rapid, that impurity content is the highest of strideing along exitting of impurity content, what impurity content was lower is used for finishing the flushing of the relatively low adsorption tower of front flushing process, impurity content along venting, and what impurity content was minimum is used for finishing the flushing of the minimum adsorption tower of front flushing process, impurity content along venting.
Describedly preferably be divided into 3～5 times along suitable the bleed air exhaust process in rapid of strideing and finish, the suitable impurity composition concentration of exitting of each time is equal difference and increases progressively distribution; The flushing process of described rinsing step is divided into and finishes along letting slip the corresponding number of times of journey, utilizes successively along the at different levels of the rapid discharging of strideing and along venting the regeneration adsorption tower is carried out normal pressure inverted sequence turn interleaving flushing.
Described dividing method along the bleed air exhaust process can for: according to adsorptive pressure and the corresponding relation of forming along venting, determine that suitable venting impurity composition concentration at different levels are equal difference and increase progressively the branch timing along putting force value corresponding in the tower, to make the suitable impurity composition concentration of exitting of each time be equal difference and increase progressively along being divided into more than three times or three times and finishing in rapid of strideing according to determined pressure along letting slip journey.
For the whole regeneration effect that improves device, the yield of raising product gas, the operating characteristics of assurance device, the investment of reduction device, each adsorption tower top exit pipeline of pressure-swing absorption apparatus of the present invention is provided with two or two formula sequencing valves of many ON/OFF and does to regulate along discharge port valves and flushing inlet valve and four control valves that are interspersed, realize more than three times or three times along letting slip journey, realize the inverted sequence turn interleaving flushing process of corresponding number of times simultaneously.
Be described in further detail technical process of the present invention below:
Multiple placing in turn interleaving flushing pressure variable adsorption technique, this pressure swing adsorption system are the continuous movement system that the adsorption tower more than 8 or 8 is formed, and each adsorption tower experiences following processing step successively in a cycle period:
(1) absorption (A): 0.8～5.0MPa unstripped gas enters adsorption tower from the unstripped gas pipeline and the sequencing valve of adsorption tower bottom, strong adsorptivity impurity composition in the raw material is adsorbed the adsorbents adsorb in the tower, the product component of weak adsorptivity passes adsorbent and discharge and send the battery limit (BL) behind the pipeline on adsorption tower top and sequencing valve, when impurity reaches normal concentration in Purge gas, close raw material and product sequencing valve, stop the charging of unstripped gas, stop absorption;
(2) all pressure drops (ED): after absorption (A) step, open the equalizing valve door, with the adsorption tower transmission of the product component in the dead space in the tower to equal voltage rise, all the adsorption tower of voltage rise is with after the pressure of this equal pressure drop adsorption tower equates, close the equalizing valve door, according to the disposal ability of adsorptive pressure, adsorbent, the situation of bed number, all pressure drop can be finished one or more times, can abbreviate as successively E1D, E2D, E3D, E4D,
(3) along putting (PP): after repeatedly all pressure drop is finished, the product component of some weak adsorptivity in the adsorption tower, the sequencing valve of opening four control valves respectively and being associated, make along removing to wash the adsorption tower that needs regeneration behind the venting process control valve pressure reducing flow stable, can be divided into three times or three finishing along letting slip journey with last time, each time is equal difference along the impurity composition concentration of exitting and increases progressively distribution, abbreviates PP1, PP2, PP3 successively as
(4) the reverse pressure (D) of putting: after multiple placing (PPi) process finished, gas still residual in the adsorption tower was drained by the feed end of bed, reversely put that to press final pressure be 0.02～0.05MPa;
(5) flushing (P): adsorbent reactivation gets more thorough in the bed in order to make, adopt the normal pressure process of washing, utilize along the gas of putting the discharge of (PP) step adsorption tower this tower is washed, reduce the reverse dividing potential drop of impurity in the bed of putting after pressure (D) step further, remaining impurity is drained from the feed end of bed, flushing process makes bed layer pressure reduce to 0.02～0.01MPa, flushing process is divided into and finishes along letting slip the corresponding number of times of journey, utilize successively along the at different levels of the rapid discharging of strideing and the regeneration adsorption tower is carried out normal pressure inverted sequence turn interleaving flushing, abbreviate as successively along venting ... P3, P2 and P1;
(6) all voltage rises (ER): this step is with all pressure drop (ED) step is corresponding, the gas that promptly utilizes equal pressure drop (ED) step adsorption tower to discharge enters the adsorption tower that finishes the P step, its pressure is raise gradually, all voltage rise can be finished one or more times, abbreviates as successively ..., E4R, E3R, E2R, E1R;
(7) (FR) finally boosts: because the E1R step can't make adsorption column pressure reach adsorption operations pressure, therefore need the part of the product gas exported with the adsorption tower that is in the A step this adsorption tower to be boosted from the product end, also useful raw materials gas boosts to this adsorption tower or product gas and unstripped gas finally boost to adsorption tower simultaneously from the bed feed end, until reaching adsorptive pressure.
The present invention is according to adsorptive pressure and the corresponding relation of forming along venting, determine that suitable venting impurity composition concentration at different levels are equal difference and increase progressively the branch timing along putting force value corresponding in the tower, will be according to determined force value along being divided into more than three times or three times and finishing in rapid of strideing along letting slip journey, obtain the suitable purge gas of putting of different qualities, the more suitable purge gas of putting of different qualities is carried out normal pressure inverted sequence turn interleaving flushing to the regeneration adsorption tower.Placing in turn interleaving flushing pressure variable adsorption technique of the present invention realized for three times of suitable venting or with last time rational and effective cut apart, improved along the service efficiency of putting purge gas, promptly reduced regeneration along putting the purge gas consumption, reach the purpose that improves product gas yield.Each adsorption tower top exit pipeline of pressure-swing absorption apparatus of the present invention is provided with two or two suitable discharge port valves of formula sequencing valves work of many ON/OFF and flushing inlet valve, and at least four control valves that are interspersed, realized three times or with the order of last time along letting slip journey, realized the inverted sequence turn interleaving flushing process of corresponding number of times simultaneously, avoided the suitable performance difference of putting the appearance of flushing process employing different adjustment valve of different adsorption towers, make the in full accord of each adsorption tower of device along putting flushing process, avoided reducing the regeneration effect of whole device, thereby avoided reducing the integrated operation performance of device because of the performance difference of control valve.
Compared with prior art, the invention has the beneficial effects as follows: multiple placing in turn interleaving flushing pressure variable adsorption technique of the present invention, owing to increased the time of regeneration, improved the low pressure desorption efficiency of impurity composition, reduce the consumption of purge gas, improved the yield of product gas.Identical in treating capacity, product quality is identical, when reaching same desorption effect, can obtain higher product gas yield; Compare along putting developing technique with traditional secondary, identical in treating capacity, when product quality was identical, absorption divided to reduce by 30% cycle time, and plant investment reduces by 20%; Compare along slowing down with secondary towards turn interleaving flushing technology, identical in treating capacity, when product quality is identical, when reaching same desorption effect, can reduces the investment of device and dwindle floor space.Reduced two along putting surge tank, reduced the investment of device, simultaneously the supporting also corresponding minimizing of pipeline, so both reduced the investment of device, also reduced the floor space of installing.Bring to the combined system of few two formula sequencing valves of two ON/OFF in the pressure-swing absorption apparatus of the present invention on four control valves and each adsorption tower, avoided the suitable performance difference of putting the appearance of flushing process employing different adjustment valve of different adsorption towers, make the in full accord of each adsorption tower of device along putting flushing process, avoided reducing the regeneration effect of whole device, thereby avoided reducing the integrated operation performance of device because of the performance difference of control valve.When part sequencing valve or control valve were out of order in the device, device can also be adjusted into twice placing in turn interleaving flushing technology operation, was guaranteeing still to obtain high product gas yield under the qualified prerequisite of product quality.And adopt the placing in turn interleaving flushing technology more than three times or three times, can avoid the secondary pollution of adsorbent fully.
The beneficial effect of patent of the present invention and traditional pressure swing adsorption technique is described with 10 tower process below:
The present invention's 10 tower process absorption total time puts developing technique and shortens 60 seconds at least than former secondary is suitable, the suitable time that puts and wash each step also can further shorten to 20 seconds, divide to drop to 40 seconds cycle time, employed adsorbent of patent of the present invention like this and adsorption tower reduced 33% than former secondary along putting developing technique at least.Compare with the secondary placing in turn interleaving flushing of routine and with the secondary turn interleaving flushing of two downflow releasing tanks, have following advantage:
Realize three times with routine or compare, can reduce by two row's sequencing valve and Liang Tai, save 50～700,000 yuan of investments, account for 1.0～1.5% of gross investment with the pressure swing adsorption technique of last time;
Compare with the turn interleaving flushing pressure variable adsorption technique of routine,, can reduce investment outlay about 15～20% because absorption divides be reduced to 60 seconds cycle time;
With compare with the pressure swing adsorption technique of two downflow releasing tanks, can reduce two and save 60～1,000,000 yuan of investments along putting surge tanks, account for 1.5～2.0% of gross investment;
With compare with the pressure swing adsorption technique of two downflow releasing tanks, because along put, the contrary time that puts and wash increases more, improve greatly by step-down and long Brownian movement impurity desorption efficiency, can reduce by about 0.5% purge gas consumption, promptly improve 0.5% hydrogen yield;
Absorption divides the best performanceization of the cycle time of device in the time of 60 seconds, and the operating time can be designed arbitrarily between 40～60 seconds, to reduce the investment of device; When device divided that cycle time, design reached 40 seconds, the investment of device can save 20% again;
Adopt three times or with the placing in turn interleaving flushing of last time, the product hydrogen yield can improve 1.0～4.0%, with 50000Nm
3It is example that the PSA of/h carries hydrogen production device, can increase production hydrogen 400～1,600 ten thousand Nm in 1 year
3/ h amounts to RMB and gives 240～9,600,000 yuan (net profit of hydrogen is conservatively by 0.6 yuan/Nm
3Consider);
On each adsorption tower with the systems of two formula sequencing valves of two ON/OFF and the combination of four control valves, avoided the suitable performance difference of putting the appearance of flushing process employing different adjustment valve of different adsorption towers, make the in full accord of each adsorption tower of device along putting flushing process, avoided reducing the regeneration effect of whole device, thereby avoided reducing the integrated operation performance of device because of the performance difference of control valve.
When the part control valve was out of order in the device, device can also be adjusted into twice placing in turn interleaving flushing technology operation, was guaranteeing still to obtain high product gas yield under the qualified prerequisite of product quality.
Adopt three times or, can avoid the secondary pollution of adsorbent fully with the placing in turn interleaving flushing of last time.
Description of drawings
Fig. 1 is three placing in turn interleaving flushing pressure variable adsorption technique schematic flow sheets of the present invention's 10 towers, and four times the placing in turn interleaving flushing pressure variable adsorption technique schematic flow sheet is similar to three flow charts, and the number of adsorption tower can increase and decrease according to actual needs.
Fig. 2 is five placing in turn interleaving flushing pressure variable adsorption technique schematic flow sheets of the present invention's 12 towers.
The specific embodiment
The present invention is described in further detail below in conjunction with specific embodiment.This embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and do not break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of the claim scope of the present invention.
Embodiment 110-2-4/P technology
Present embodiment is 10 tower pressure swing absorption process of separating and reclaiming hydrogen from conversion gas, and operating pressure is 2.4MPa, and temperature is 40 ℃, and the content of hydrogen is 70% in the processed unstripped gas, and product hydrogen requires H
2〉=99.9%.
As shown in Figure 1, the pressure-swing absorption apparatus of present embodiment is divided into two series, and wherein T0101, T0103, T0105, T0107, T0109 adsorption tower are formed single series, and T0102, T0104, T0106, T0108, T0110 form bi serie; Set up a control valve PV101 and PV102 respectively at single bi serie, put between the flushing sequencing valve in two alignments two control valve PV103 and PV104 are set; Two alignments of single bi serie are provided with the hand stop valve door before and after putting the flushing control valve; Each adsorption tower top exit pipeline is provided with two formula sequencing valves of two ON/OFF and does along discharge port valve and flushing inlet valve.
Three placing in turn interleaving flushing technology of table 3:10-2-4/P time-scale
Every adsorption tower experience absorption (A) successively in a cycle period, (E1D) falls in isostasy for the first time, (E2D) falls in isostasy for the second time, (E3D) falls in isostasy for the third time, the 4th time (E4D) falls in isostasy, the first step is along putting (PP1), second step is along putting (PP2), the 3rd step is along putting (PP3), contrary put (D), the 3rd step flushing (P3), the second step flushing (P2), first step flushing (P1), the 4th isostasy liter (E4R), isostasy liter (E3R) for the third time, isostasy liter (E2R) for the second time, isostasy liter (E1R) for the first time, (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.According to forming and along the relation of blow off pressure as can be known, the pressure corresponding points when cutting along venting impurity composition concentration three inferior difference are as follows: PP1:0.52MPa (starting point pressure) → 0.42MPa (end pressure) of this technology along venting; PP2:0.42MPa (starting point pressure) → 0.31MPa (end pressure); PP3:0.31MPa (starting point pressure) → 0.18MPa (end pressure).Fig. 1 is seen in the technological process of present embodiment, and the technology time-scale is as shown in table 3.
Be that example describes two alignments and puts the operation principle that whole regenerative process is finished in flushing sequencing valve and the combination of four control valves with adsorption tower T0101 below:
What contain the trace impurity component for the first time carries out last flushing for the third time along entering the adsorption tower T0108 that finishes flushing for the second time after the adjusting of venting (PP1) process control valve PV101 constant current constant voltage, finishes the final regenerative process of T0108.What contain the small amount of impurities component for the second time carries out the flushing second time along entering the adsorption tower T0109 that finishes flushing for the first time after the adjusting of venting (PP2) process control valve PV103 constant current constant voltage.What contain more impurity composition for the third time carries out the flushing first time along entering just to finish against the adsorption tower T0110 that lets slip journey after the adjusting of venting (PP3) process control valve PV102 constant current constant voltage.
Along put finish after, T0101 enters the contrary journey of letting slip immediately, high-pressure section was put sequencing valve and was contraryly put main valve and enter the stripping gas surge tank through contrary early stage, the later stage low-pressure section directly enters the stripping gas blending tank by contrary after putting the control valve constant current constant voltage.Against letting slip journey along with the tower internal pressure constantly reduces, most of impurity composition is along with contrary venting desorbs, also remain the small part impurity composition and be not able to do in time to diffuse out, have only by washing just of other tower and can finish reproduction operation along venting by step-down and Blang's operation.
Contrary letting slip just enters the flushing regenerative process after journey finishes, T0101 wash for the third time by T0102 include more impurity composition for the third time along venting, by washing behind the control valve PV102 constant current constant voltage, finish the flushing first time of T0101.Carry out the flushing second time along venting by removing adsorption tower T0101 behind the control valve PV104 constant current constant voltage second time that contains the small amount of impurities component of adsorption tower T0103.The first time that contains the trace impurity component of T0104 is along exitting by going adsorption tower T0101 to wash for the third time behind the control valve PV101 constant current constant voltage, after the inverted sequence flushing of three orders along venting of the impurity composition of tower T0101 by other adsorption tower at this moment, all impurity compositions develop fully in the tower, reach the purpose of regeneration.
By three suitable successively (PP) processes of putting of adsorption tower, suitable venting is divided into the suitable venting (PP1) that contains the trace impurity component, contain suitable three kinds of purge gas along exit (PP3) of exitting (PP2) and containing more impurity composition of small amount of impurities component.Flushing is adopted and is carried out the inverted sequence turn interleaving flushing along what let slip the journey reversed in order, has both reduced the consumption of the available gas hydrogen that consumes in the regeneration flushing process, thereby has improved the yield of hydrogen, the factor of having avoided adsorption tower to be secondary polluted again.Guaranteeing that absorption has only 120 seconds (A) total time, compares with the traditional PSA device against putting and wash under the prerequisite of regeneration effect, investment reduces greatly, the regeneration washing time reaches 90 seconds, and hydrogen yield increases by 1.5% than the suitable developing technique of putting of traditional secondary, and hydrogen yield can reach more than 90.5%.
By four control valves that are interspersed are set in pressure swing adsorption system, two formula sequencing valves of two ON/OFF are set on each adsorption tower top exit pipeline to be done to have realized placing in turn interleaving flushing three times along discharge port valve and the flushing system that inlet valve combined, order is along putting and the corresponding one by one control of inverted sequence flushing process, control mode is simply effective, avoided the suitable performance difference of putting the appearance of flushing process employing different adjustment valve of different adsorption towers simultaneously, make the in full accord of each adsorption tower of device along putting flushing process, avoided reducing the regeneration effect of whole device, thereby avoided reducing the integrated operation performance of device because of the performance difference of control valve.And when wherein any control valve broke down, all available corresponding another control valve was realized the function of two control valves.Promptly when between PV101 and the PV102 any one when being out of order, all available another finished the function of two control valves; Equally finish the function of two control valves when any all available another when being out of order between PV103 and the PV104.A certain control element on list or bi serie adsorption tower (containing magnetic valve, sequencing valve and control valve) breaks down, and can excise out of order a series ofly, and another series continues operation, really realizes the fault element on-line maintenance.
Embodiment 2 12-3-5/P technologies
Present embodiment is for therefrom becoming 12 tower pressure swing absorption process of separating and reclaiming hydrogen in the gas, and operating pressure is 2.7MPa, and temperature is 40 ℃, and the content of hydrogen is 70% in the processed unstripped gas, and product hydrogen requires H
2〉=99.9%.
The pressure-swing absorption apparatus of present embodiment is divided into two series, and wherein T0101, T0103, T0105, T0107, T0109, T0111 adsorption tower are formed single series, and T0102, T0104, T0106, T0108, T0110, T0112 adsorption tower are formed bi serie; Set up a control valve PV101 and PV102 respectively at single bi serie, put between the flushing sequencing valve in two alignments two control valve PV103 and PV104 are set; Each adsorption tower top exit pipeline is provided with two formula sequencing valves of two ON/OFF and does along discharge port valve and flushing inlet valve.Every adsorption tower experience absorption (A) successively in a cycle period, (E1D) falls in isostasy for the first time, (E2D) falls in isostasy for the second time, (E3D) falls in isostasy for the third time, the 4th time (E4D) falls in isostasy, the 5th time (E5D) falls in isostasy, the first step is along putting (PP1), second step is along putting (PP2), the 3rd step is along putting (PP3), the 4th step is along putting (PP4), contrary put (D), the 4th step flushing (P4), the 3rd step flushing (P3), the second step flushing (P2), first step flushing (P1), the 5th isostasy liter (E5R), the 4th isostasy liter (E4R), isostasy liter (E3R) for the third time, isostasy liter (E2R) for the second time, isostasy liter (E1R) for the first time, (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.Pressure corresponding points when cutting along venting impurity composition concentration three inferior difference are: PP1:0.50MPa (starting point pressure) → 0.40MPa (end pressure); PP2:0.40MPa (starting point pressure) → 0.30MPa (end pressure); PP3:0.30MPa (starting point pressure) → 0.18MPa (end pressure).The technology time-scale of present embodiment is as shown in table 4.
This technology can realize placing in turn interleaving flushing three times, guaranteeing against putting and wash under the prerequisite of regeneration effect, absorption also has only 180 seconds (A) total time, compare with the traditional PSA device, investment reduces greatly, the regeneration washing time reaches 90 seconds, and hydrogen yield increases by 2.5% than the suitable developing technique of putting of traditional secondary, can reach 91.5%.
Table 4:12-3-5/P technology time-scale
Embodiment 3 12-2-5/P technologies
Present embodiment is for therefrom becoming 12 tower pressure swing absorption process of separating and reclaiming hydrogen in the gas, and operating pressure is 2.7MPa, and temperature is 40 ℃, and the content of hydrogen is 70% in the processed unstripped gas, and product hydrogen requires H
2〉=99.9%.
The pressure-swing absorption apparatus of present embodiment is divided into two series, and wherein T0101, T0103, T0105, T0107, T0109, T0111 adsorption tower are formed single series, and T0102, T0104, T0106, T0108, T0110, T0112 adsorption tower are formed bi serie; Set up a control valve PV101 and PV102 respectively at single bi serie, put between the flushing sequencing valve in two alignments two control valve PV103 and PV104 are set; Each adsorption tower top exit pipeline is provided with two formula sequencing valves of two ON/OFF and does along discharge port valve and flushing inlet valve.Every adsorption tower experience absorption (A) successively in a cycle period, (E1D) falls in isostasy for the first time, (E2D) falls in isostasy for the second time, (E3D) falls in isostasy for the third time, the 4th time (E4D) falls in isostasy, the 5th time (E5D) falls in isostasy, the first step is along putting (PP1), second step is along putting (PP2), the 3rd step is along putting (PP3), the 4th step is along putting (PP4), contrary put (D), the 4th step flushing (P4), the 3rd step flushing (P3), the second step flushing (P2), first step flushing (P1), the 5th isostasy liter (E5R), the 4th isostasy liter (E4R), isostasy liter (E3R) for the third time, isostasy liter (E2R) for the second time, isostasy liter (E1R) for the first time, (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.Pressure corresponding points when cutting along venting impurity composition concentration four inferior difference are as follows: PP1:0.50MPa (starting point pressure) → 0.44MPa (end pressure); PP2:0.44MPa (starting point pressure) → 0.36MPa (end pressure); PP3:0.36MPa (starting point pressure) → 0.27MPa (end pressure); PP4:0.27MPa (starting point pressure) → 0.16MPa (end pressure).The technology time-scale of present embodiment is as shown in table 5.
Table 5:12-2-5/P technology time-scale
This technology can realize placing in turn interleaving flushing four times, guaranteeing against putting and wash under the prerequisite of regeneration effect, absorption also has only 100 seconds (A) total time, compare with the traditional PSA device, investment reduces greatly, the regeneration washing time reaches 100 seconds, and hydrogen yield increases by 3.5% than the suitable developing technique of putting of traditional secondary, can reach 92.5%.
Embodiment 4 12-2-4/P technologies
Present embodiment is for therefrom becoming 12 tower pressure swing absorption process of separating and reclaiming hydrogen in the gas, and operating pressure is 2.7MPa, and temperature is 40 ℃, and the content of hydrogen is 70% in the processed unstripped gas, and product hydrogen requires H
2〉=99.9%.
As shown in Figure 2, the pressure-swing absorption apparatus of present embodiment is divided into two series, wherein T0101, T0103, T0105, T0107, T0109, T0111 adsorption tower are formed single series, and T0102, T0104, T0106, T0108, T0110, T0112 adsorption tower are formed bi serie; Set up two control valve PV101 and PV102 respectively at single bi serie, put between the flushing sequencing valve in two alignments two control valve PV103/4 and PV105/6 are set.Each adsorption tower top exit pipeline is provided with two formula sequencing valves of four ON/OFF and does along discharge port valve and flushing inlet valve.Every adsorption tower experience absorption (A) successively in a cycle period, (E1D) falls in isostasy for the first time, (E2D) falls in isostasy for the second time, (E3D) falls in isostasy for the third time, the 4th time (E4D) falls in isostasy, the first step is along putting (PP1), second step is along putting (PP2), the 3rd step is along putting (PP3), the 4th step is along putting (PP4), the 5th step is along putting (PP5), contrary put (D), the 5th step flushing (P5), the 4th step flushing (P4), the 3rd step flushing (P3), the second step flushing (P2), first step flushing (P1), the 4th isostasy liter (E4R), isostasy liter (E3R) for the third time, isostasy liter (E2R) for the second time, isostasy liter (E1R) for the first time, (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.Pressure corresponding points when cutting along venting impurity composition concentration five inferior difference are as follows: PP1:0.54MPa (starting point pressure) → 0.48MPa (end pressure); PP2:0.48MPa (starting point pressure) → 0.41MPa (end pressure); PP3:0.41MPa (starting point pressure) → 0.36MPa (end pressure); PP4:0.36MPa (starting point pressure) → 0.28MPa (end pressure); PP5:0.28MPa (starting point pressure) → 0.18MPa (end pressure).
The process flow diagram of present embodiment as shown in Figure 2, the technology time-scale is as shown in table 5.
Table 6:12-2-4/P technology time-scale
This technology can realize placing in turn interleaving flushing four times, guaranteeing against putting and wash under the prerequisite of regeneration effect, absorption also has only 80 seconds (A) total time, compare with the traditional PSA device, investment reduces greatly, the flushing recovery time reaches 100 seconds, and hydrogen yield increases by 4.0% than the suitable developing technique of putting of traditional secondary, can reach 93.0%.
Embodiment 5 8-1-3/P technologies
Present embodiment is for therefrom becoming 8 tower pressure swing absorption process of separating and reclaiming hydrogen in the gas, and operating pressure is 2.0MPa, and temperature is 40 ℃, and the content of hydrogen is 69% in the processed unstripped gas, and product hydrogen requires H
2〉=99.9%.
The pressure-swing absorption apparatus of present embodiment is divided into two series, and wherein T0101, T0103, T0105, T0107 adsorption tower are formed single series, and T0102, T0104, T0106, T0108 adsorption tower are formed bi serie; Set up a control valve PV101 and PV102 respectively at single bi serie, put between the flushing sequencing valve in two alignments two control valve PV103 and PV104 are set.Each adsorption tower top exit pipeline is provided with two or two suitable discharge port valves of formula sequencing valves work of many ON/OFF and flushing inlet valve.Every adsorption tower experience absorption (A) successively in a cycle period, (E1D) falls in isostasy for the first time, (E2D) falls in isostasy for the second time, (E3D) falls in isostasy for the third time, the first step is along putting (PP1), second step is along putting (PP2), the 3rd step is along putting (PP3), contrary put (D), the 3rd step flushing (P3), the second step flushing (P2), first step flushing (P1), isostasy liter (E3R) for the third time, isostasy liter (E2R) for the second time, isostasy liter (E1R) for the first time, (FR) finally boosts.All the other adsorption towers also experience same process, just stagger mutually on the time.Pressure corresponding points when cutting along venting impurity composition concentration three inferior difference are as follows: PP1:0.50MPa (starting point pressure) → 0.40MPa (end pressure); PP2:0.40MPa (starting point pressure) → 0.30MPa (end pressure); PP3:0.30MPa (starting point pressure) → 0.20MPa (end pressure).The technology time-scale of present embodiment is as shown in table 7.
Table 7:8-1-3/P technology time-scale
This technology also can realize placing in turn interleaving flushing three times, guaranteeing against putting and wash under the prerequisite of regeneration effect, absorption has only 60 seconds (A) total time, compare with the traditional PSA device, investment reduces greatly, the regeneration washing time reaches 90 seconds, and hydrogen yield increases by 1.0% than the suitable developing technique of putting of traditional secondary, and hydrogen yield reaches 87%.
Claims (5)
1, a kind of pressure swing adsorption technique of multiple placing in turn interleaving flushing, its pressure swing adsorption system is that system is transfered from one department to another in multi-tower continuous reforwarding, each adsorption tower experiences absorption (A), all pressure drops (ED), suitable (PP), reverse pressure (D), flushing (P), equal voltage rise (ER), (FR) process of finally boosting of putting of putting successively in a cycle period, it is characterized in that: described being divided into more than three times or three times along the suitable bleed air exhaust process in strideing suddenly finished, and each time is equal difference along the impurity composition concentration of exitting and increases progressively distribution; The flushing process of described rinsing step is divided into and finishes along letting slip the corresponding number of times of journey, utilize successively along the at different levels of the rapid discharging of strideing and the regeneration adsorption tower is carried out normal pressure inverted sequence turn interleaving flushing along venting, be that the highest contrary adsorption tower rapid, that impurity content is the highest of strideing that is used for just finishing along exitting of impurity content washes, the suitable venting that impurity content is lower is used for finishing the front flushing process, the relatively low adsorption tower of impurity content washes, and the suitable venting that impurity content is minimum is used for finishing the front flushing process, the minimum adsorption tower of impurity content washes.
2, the pressure swing adsorption technique of multiple placing in turn interleaving flushing according to claim 1 is characterized in that describedly being divided into 3～5 times along suitable the bleed air exhaust process in rapid of strideing and finishing, and the suitable impurity composition concentration of exitting of each time is equal difference and increases progressively distribution; The flushing process of described rinsing step is divided into and finishes along letting slip the corresponding number of times of journey, utilizes successively along the at different levels of the rapid discharging of strideing and along venting the regeneration adsorption tower is carried out normal pressure inverted sequence turn interleaving flushing.
3, the pressure swing adsorption technique of multiple placing in turn interleaving flushing according to claim 1 and 2, it is characterized in that described dividing method along the bleed air exhaust process is to increase progressively distribution along venting impurity composition concentration by equal difference: according to adsorptive pressure and along the corresponding relation of exitting and forming, determine at different levelsly to be equal difference along venting impurity composition concentration and to increase progressively the branch timing along putting force value corresponding in the tower, will let slip journey along suitable in rapid of strideing according to determined pressure and be divided into more than three times or three times and finish.
4, the pressure swing adsorption technique of multiple placing in turn interleaving flushing according to claim 1 and 2, it is characterized in that described pressure swing adsorption system is the continuous movement system that the adsorption tower more than 8 or 8 is formed, at least four control valves that are interspersed, each adsorption tower top exit pipeline are set in the pressure swing adsorption system are provided with two or two suitable discharge port valves of formula sequencing valves work of many ON/OFF and flushing inlet valve, to along putting and flushing process is regulated, realize the suitable journey of letting slip of order more than three times or three times, reach the inverted sequence turn interleaving flushing process of corresponding number of times.
5, the pressure swing adsorption technique of multiple placing in turn interleaving flushing according to claim 3, it is characterized in that described pressure swing adsorption system is the continuous movement system that the adsorption tower more than 8 or 8 is formed, at least four control valves that are interspersed, each adsorption tower top exit pipeline are set in the pressure swing adsorption system are provided with two or two suitable discharge port valves of formula sequencing valves work of many ON/OFF and flushing inlet valve, to along putting and flushing process is regulated, realize the suitable journey of letting slip of order more than three times or three times, reach the inverted sequence turn interleaving flushing process of corresponding number of times.
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| FR3011481B1 (en) * | 2013-10-04 | 2017-01-20 | Air Liquide | PRESSURE MODULATION ADSORPTION METHOD WITH REGULATION |
| CN104474842A (en) * | 2014-11-26 | 2015-04-01 | 四川天一科技股份有限公司 | Temperature swing adsorption method for purifying tail gas of calcium carbide furnace |
| CN107349746B (en) * | 2017-08-29 | 2019-12-17 | 四川天采科技有限责任公司 | Pressure swing adsorption method for linkage control of pressure change in cyclic operation |
| CN107511026A (en) * | 2017-10-19 | 2017-12-26 | 成都巨涛油气工程有限公司 | A kind of multi-tower variable pressure adsorption classification flusher and method |
| CN113477031A (en) * | 2021-06-18 | 2021-10-08 | 四川亚联高科技股份有限公司 | Pressure swing adsorption device and control method thereof |
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