CN101664631B - Energy-saving separation device for mixed gas molecular sieve - Google Patents
Energy-saving separation device for mixed gas molecular sieve Download PDFInfo
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- CN101664631B CN101664631B CN2009100240625A CN200910024062A CN101664631B CN 101664631 B CN101664631 B CN 101664631B CN 2009100240625 A CN2009100240625 A CN 2009100240625A CN 200910024062 A CN200910024062 A CN 200910024062A CN 101664631 B CN101664631 B CN 101664631B
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Abstract
The invention relates to an energy-saving separation device for a mixed gas molecular sieve, comprising at least two or more drying/absorption towers, an air cooler, a gas-water separator and an electric heater and characterized in that an air pipe of the device is provided with a micro filter which can lower liquid drops entering the absorption towers from a value smaller than 10 microns to a value smaller than 1 micron so as to greatly lighten the load of an absorption process and decrease the operation cost and the energy consumption. The energy-saving separation device is also characterized in that a first-level gas-gas heat exchanger 8 is added in the heat regeneration flow of the device so as to recycle lower heat and water condensation heat which are discharged from the drying towers, reduce the emission of heat energy of the air cooler to air and also reduce the electricity consumption of the electric heater. The invention further improves the filtration performance of the micro filter and the heat exchange efficiency of the heat exchanger to be optimal. Practical operation shows that the device improves the heat energy utilization from about 50 percent to 80 percent and achieves optimal efficiency.
Description
Technical field
The present invention relates to a kind of molecular sieve separator of molecular sieve separator, particularly a kind of energy-saving mist of mist.It is applicable to remove in the natural gas ammonia in the Methanol Recovery in the blow-out gas in water, the methanol synthetizing technology, the chemical process gas remove and recovery and chemical process gas in the removing and recovery etc. of sulfide.
Background technology
The molecular sieve separator that uses double-column process commonly used is gone up in industry at present.During work, a tower absorption, another tower regeneration, after absorption was saturated, this tower transferred regeneration immediately to, and another tower transfers absorption to immediately by regeneration, and separation process is carried out continuously.Removing water with natural gas below is its course of work of example explanation and the problem that exists.Referring to Fig. 4, its absorption process is: gas material is during through absorption tower 200A, and the moisture in the gas is by the molecular sieve adsorption in the tower, and the natural gas that goes out tower can satisfy liquefied natural gas (being called for short LNG) and the requirement of compressed natural gas (abbreviation CNG) to dew point; Regenerative process is: the natural gas that using system has dewatered (be moisture trap 400 come out gas) through electric heater 600 be warmed up to～220 ℃, get into the tower from the tower still of drying tower 200B, the water evaporates of molecular sieve adsorption in the tower is taken out of; Simultaneously self temperature drop to～120 ℃, cat head goes out the saturated gas of tower through behind the air cooler 300, cools to～40 ℃; Moisture content in the gas is condensed into droplet, passes through the gas-water separation of moisture trap 400 again, with condensed from and discharge; Natural gas via force (forcing) pump 500 pressurizations of not coagulating; After the heating to of electric heater 600～220 ℃, get into drying tower 200B again again, form circulation.What this regenerative process was used is a kind of method of heat regeneration, and it can make molecular sieve recover adsorption capacity the desorb through evaporation of the moisture in the molecular sieve that is filled water.The advantage of above-mentioned technology is: the gas dew point after the processing low (below 100 ℃) can realize full-automatic operation, and shortcoming is: in the regenerative process of heating, condensation, energy consumption is high, and more obvious during reduction process tolerance, the utilization rate of heat energy has only about 50%.
Summary of the invention
The objective of the invention is provides a kind of energy-saving mist molecular sieve separator to the deficiency in the prior art, reaches the purpose of energy-saving and emission-reduction.
For realizing above-mentioned purpose, technical scheme of the present invention is following:
It is made up of two or more dryings/absorption tower, air cooler, moisture trap, electric heater at least; The cat head fairlead of said each drying/adsorption tower is divided into two-way; The valve of leading up to is incorporated the gaseous mixture air inlet pipe into, and another road is also incorporated a total fairlead into through a valve, and the air inlet pipe of described total fairlead and air cooler is joined; The escape pipe of said air cooler and the air inlet pipe of moisture trap are joined; The escape pipe of said moisture trap and the air inlet pipe of electric heater are joined, and the tower still fairlead of said each drying/adsorption tower also is divided into two-way, lead up to a valve and gaseous mixture escape pipe to join; Another road also joins through the escape pipe of a valve and electric heater, and its improvements are: on described air inlet pipe, be provided with a microstrainer; Between total fairlead of each drying/adsorption tower cat head and air cooler, set up a gas/gas heat exchanger, this heat exchanger is used for each drying/adsorption tower cat head and always draws the heat exchange that hot gas and moisture trap are drawn cold air.
The further improved technical scheme of the present invention is following:
Described gas/gas heat exchanger is a corrugated tube heat exchanger.
Filter core is processed by stainless steel 316L silk felt material is folding in the said microstrainer.
Can find out through technique scheme; The present invention has been replaced as a microstrainer with fore filter; This microstrainer can make the drop that gets in the adsorption tower gas dropped to＜1 μ m by＜10 μ m, thereby has alleviated the load of absorption process greatly, has reduced operating cost and energy consumption; Simultaneously, the present invention has added one-level gas/gas heat exchanger again in heat regeneration flow process, and low level heat and water condensation heat that drying tower is come out have all obtained recovery, have reduced air cooler and have discharged to heat energy in air, have also practiced thrift the energy consumption of electric heater simultaneously.Only pass through above-mentioned 2 improvement, the present invention has just obtained the considerable energy saving emission reduction effect.It is to improve the strainability of microstrainer and the heat exchange efficiency of heat exchanger that the present invention further improves, and makes their performance and heat exchange efficiency reach best, finally reaches better effects of energy saving and emission reduction.Actual motion shows that heat energy utilization rate of the present invention is brought up to about 80% by about 50%, has obtained comparatively desirable effect.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of bellows heat exchanger.
Fig. 3 is the structural representation of microstrainer.
Fig. 4 is the structural representation of existing molecular sieve separator.
The specific embodiment
The double-column process that still removes water with natural gas below is the structure and the operation principle of this device of example explanation.
Referring to Fig. 1; This device comprises two dryings/ absorption tower 2A, 2B, air cooler 3, moisture trap 4, force (forcing) pump 5, electric heater 6; The cat head fairlead of tower 2A and tower 2B is divided into two-way; One the tunnel incorporates natural gas air inlet pipe 9 into through a valve 1A and 1B respectively, and another road is incorporated a total fairlead 10 into through a valve 2A and 2B respectively, and this total fairlead 10 joins with the hot gas air inlet pipe of heat exchanger 8; The hot gas escape pipe of heat exchanger 8 and the air inlet pipe of air cooler 3 are joined; The air inlet pipe of the escape pipe of air cooler 3 and moisture trap 4 is joined, and the escape pipe of moisture trap 4 joins through force (forcing) pump 5 and 8 cold air air inlet pipe of heat exchanger, and the cold air escape pipe of heat exchanger 8 and electric heater 6 air inlets join; The tower still fairlead of tower 2A and 2B also is divided into two-way, the one tunnel respectively the fairlead 11 through a valve 3A and 3B and natural gas join, another road joins through the escape pipe of a valve 4A and 4B and electric heater 6 respectively.
The workflow of this device is: suppose device is in the state of tower 2A absorption, tower 2B regeneration, then opens cat head valve 1A, 2B, closes cat head valve 1B, 2A; Open tower still valve 3A, 4B, close tower still valve 4A, 3B; In the absorption process, the natural gas air inlet gets into tower 2A through microstrainer 1 with valve 1A, and gas passes the molecular sieve in the tower, and moisture is wherein come out from the tower still by molecular sieve adsorption then, goes out device through valve 3A and filter 7, accomplishes the absorption process; The natural gas that goes out tower can satisfy LNG and the CNG requirement to dew point.In regenerative process, be heated to 220 ℃ of dry gas from what electric heater 6 came out, get into tower 2B through valve 4B, after the natural gas of heat drying passes the molecular sieve in the tower; With water evaporation in the molecular sieve, come out from cat head, this steam-laden gas is about 120 ℃; It gets into heat exchanger 8 through valve 2B, and with the not cold air heat exchange with fixed attention that moisture trap comes out, temperature is reduced to entering air cooler 3 in back about 60 ℃; After the air cooling, gas cools to about 40 ℃, and moisture content wherein is condensed into droplet; Pass through the gas-water separation of moisture trap 4 again, its condensed water is separated and discharge, and fixed gas gets into heat exchanger 8 through the pressurization of force (forcing) pump 5; With 120 ℃ of hot gas heat exchange that the 2B column overhead is come out, temperature is upgraded to more than 100 ℃, gets into electric pressurizer 6 again; Through after heating to about 220 ℃, get into tower 2B through valve 4B again, form circulation.In this circulation, the natural gas of heat drying is with water evaporation in the molecular sieve, and vaporized gas makes moisture content wherein form droplet again through condensation, fog is separated again, and back and forth carries out, and makes the water of molecular sieve adsorption obtain desorb.When the water in the molecular sieve is separated the value that is drawn onto technological requirement, through the switching of valve, make tower 2B transfer absorption to, tower 2A transfers regeneration to, and so circulation is carried out dehydration process continuously.
If the treating capacity of natural gas is bigger, can extend to multi-tower structure with reference to Double-Tower Structure.In above-mentioned technological process, the absorption time is long, and the recovery time is short, so in the multitower flow process, be made as regeneration to tower of major general, and all the other all are made as absorption, and regenerative process is carried out between multitower successively by turns, can realize the function of above-mentioned continuous dehydration equally.
Device of the present invention is not limited to remove in the above-mentioned natural gas application of water, can also be used for removing of ammonia in the Methanol Recovery, chemical process gas in the methanol synthetizing technology blow-out gas and removing and recovery etc. of recovery and chemical process gas cure thing.When being used for above-mentioned technology, only need technological parameter (like the pressure and other parameters of tower) is carried out respective change, do not need the modifier structure.
Referring to Fig. 2, described heat exchanger adopts corrugated tube heat exchanger, and it comprises cylindrical shell 801; Barrel bottom at this cylindrical shell 801 is provided with cold air air inlet pipe 809, is provided with cold air escape pipe 810 on the top of this cylindrical shell, is provided with upper cover 802 at the top of this cylindrical shell 801; This is provided with hot gas inlet tube 808 above upper cover 802, the bottom of this cylindrical shell 801 is provided with low head 805, and low head is provided with hot gas outlet 807; These cylindrical shell 801 upper ends are provided with upper perforated plate 804, and its lower end is provided with lower perforated plate 803, between upper perforated plate 804 and the lower perforated plate 803 many bellowss 806 are housed; The inside and outside surface of this bellows all is corrugated, and adopts the thin-wall metal material.
During work; Hot gas gets into tube sides from inlet tube 808, and cold air gets into shell sides from the inlet tube 809 of corrugated tube heat exchanger simultaneously, and cold and hot gas is in this heat exchanger after the heat exchange; The hot gas of cooling is discharged from heat outlet pipe 807, and the cold air of intensification is discharged from cold air outlet pipe 10.Hot and cold gas produces sufficient ripple through time inside and outside the bellows and flows, and strong flow disturbance occurs, can increase substantially heat exchanger tube internal heat transfer coefficient; Thermal resistance is little; It is fast to conduct heat, and its heat transfer efficiency is 2 times of traditional stainless heat exchanger, simultaneously; Price is about 50% of traditional stainless heat exchanger, and its cost performance is high.
Referring to Fig. 3, described microstrainer comprises cylindrical shell 101, is provided with upper cover 102 at the top of this cylindrical shell; The top of this end socket 102 is provided with gas outlet tube 106; Be provided with low head 103 in the bottom of this cylindrical shell 101, be provided with drain pipe 107 in the bottom of low head 103, these cylindrical shell 101 upper ends are provided with upper perforated plate 104; On this upper perforated plate 104, micro-filtration element 105 is housed, the side of this cylindrical shell 101 is provided with inlet tube 108.During work, gaseous mixture gets into tube side from inlet tube 108, and through the filtration of micro-filtration element 105, pure qi (oxygen) is discharged from gas outlet tube 106, and the droplet that filters is discharged from scavenge port 107.The filter core 105 of this microstrainer is processed by stainless steel 316L silk felt material is folding, and folding 3～5 times of its filter area right and wrong have improved strainability, but the drop of filtering diameter＜1 μ m.
Claims (3)
1. the molecular sieve separator of a mist; It is made up of two or more drying/adsorption towers, air cooler (3), moisture trap (4), electric heater (6) at least; Each column overhead fairlead of said two or more drying/adsorption towers is divided into two-way; First valve of leading up to is incorporated gaseous mixture air inlet pipe (9) into, and another road is incorporated a total fairlead (10) into through second valve, and described total fairlead (10) joins with the air inlet pipe of air cooler (3); The air inlet pipe of the escape pipe of said air cooler and moisture trap (4) is joined; The air inlet pipe of the escape pipe of said moisture trap (4) and electric heater (6) is joined, and each Tata still fairlead of said two or more drying/adsorption towers also is divided into two-way, leads up to the 3rd valve and gaseous mixture escape pipe (11) to join; Another road joins through the escape pipe of the 4th valve and electric heater (6), it is characterized in that:
A, on described air inlet pipe (9), be provided with a microstrainer (1);
B, between total fairlead (10) of each drying/adsorption tower cat head and air cooler (3), set up a gas/gas heat exchanger (8), this heat exchanger is used for each drying/adsorption tower cat head and always draws the heat exchange that hot gas and moisture trap (4) are drawn cold air.
2. the molecular sieve separator of mist according to claim 1, it is characterized in that: described gas/gas heat exchanger (8) is a corrugated tube heat exchanger.
3. the molecular sieve separator of mist according to claim 1 and 2 is characterized in that: filter core (105) is processed by stainless steel 316L silk felt material is folding in the said microstrainer (1).
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| CN101664631B true CN101664631B (en) | 2012-01-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104368221B (en) * | 2014-11-14 | 2016-05-11 | 杰瑞石油天然气工程有限公司 | The device of the de-hydrocarbon of a kind of high methane gas dehydration |
| CN105713688A (en) * | 2014-12-19 | 2016-06-29 | 重庆恬愉石油技术有限公司 | Shale gas based double-tower cyclic dehydration system |
| CN105713689A (en) * | 2014-12-19 | 2016-06-29 | 重庆恬愉石油技术有限公司 | Double-tower circulation dewatering system |
| CN104984825B (en) * | 2015-07-20 | 2017-08-25 | 中国矿业大学 | Microfine moist material friction electrical selection method and device |
| CN106753641A (en) * | 2016-12-21 | 2017-05-31 | 深圳市燃气集团股份有限公司 | A kind of system of natural gas drying unit reclaiming gas heat |
| CN111399561B (en) * | 2020-03-13 | 2021-03-16 | 西安交通大学 | Temperature control system and method for triethylene glycol dehydration process |
| CN114939326B (en) * | 2022-06-07 | 2023-07-28 | 中冶华天工程技术有限公司 | Novel molecular sieve adsorber of one-tower double-purpose |
Citations (4)
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| US4738692A (en) * | 1986-02-14 | 1988-04-19 | Fresch Vincent P | Gas drying apparatus |
| CN2040407U (en) * | 1988-08-25 | 1989-07-05 | 严福临 | High-efficient energy-saving dryer and purger |
| EP1366794A1 (en) * | 2002-05-31 | 2003-12-03 | Air Products And Chemicals, Inc. | Process for purifying gas streams using composite adsorbent |
| CN201543359U (en) * | 2009-09-27 | 2010-08-11 | 西安超滤化工有限责任公司 | Energy-saving type mixed gas molecular sieve separating device |
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2009
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4738692A (en) * | 1986-02-14 | 1988-04-19 | Fresch Vincent P | Gas drying apparatus |
| CN2040407U (en) * | 1988-08-25 | 1989-07-05 | 严福临 | High-efficient energy-saving dryer and purger |
| EP1366794A1 (en) * | 2002-05-31 | 2003-12-03 | Air Products And Chemicals, Inc. | Process for purifying gas streams using composite adsorbent |
| CN201543359U (en) * | 2009-09-27 | 2010-08-11 | 西安超滤化工有限责任公司 | Energy-saving type mixed gas molecular sieve separating device |
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Address after: 710075 No. three, No. 8, hi tech Road, Shaanxi, Xi'an Patentee after: XI'AN ULTRA-FILTRATION ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Address before: 610 room 8, No. three, 710075 hi tech Road, Shaanxi, Xi'an, China Patentee before: Xi'an Hyperfiltration Chemical Co., Ltd. |
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Denomination of invention: Energy-saving separation device for mixed gas molecular sieve Effective date of registration: 20180330 Granted publication date: 20120111 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN ULTRA-FILTRATION ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Registration number: 2018610000041 |
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Date of cancellation: 20190604 Granted publication date: 20120111 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN ULTRA-FILTRATION ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD. Registration number: 2018610000041 |
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