CN105749701A - Reinforced desorption method of acidic gas - Google Patents
Reinforced desorption method of acidic gas Download PDFInfo
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- CN105749701A CN105749701A CN201410799166.4A CN201410799166A CN105749701A CN 105749701 A CN105749701 A CN 105749701A CN 201410799166 A CN201410799166 A CN 201410799166A CN 105749701 A CN105749701 A CN 105749701A
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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Abstract
The invention provides a reinforced desorption method of an acidic gas. The method is characterized in that inner groove-shaped micro-channels are introduced to a micro-channel reactor, and desorption process reinforcement of a carbon dioxide absorption liquid is carried out under 0.1-1MPa at 90-160DEG C for 0.01-100s. The micro-reactor comprises a plate heat exchange unit and a plate desorption unit, and the plate desorption unit is formed by the parallel inner groove-shaped micro-channels. The method can realize carbon dioxide desorption in an extremely short time, prevent absorbent overheating and reduce the volume of evaporated water, and has a small size in order to greatly reduce the energy and material consumption in the desorption process of the carbon dioxide absorption liquid and the occupied area. The energy consumption, the material consumption and the occupied area of the reinforced desorption method are respectively 20% or above lower than those of traditional tower desorption systems.
Description
Technical field
The present invention relates to the strengthening desorption method of a kind of sour gas, specifically a kind of micro passage reaction technology strengthened acid GAS ABSORPTION liquid desorption process and reduce its desorption process energy consumption.This method can be used for the regeneration of flue gas, the synthesis absorption solution of acid gases such as ammonia, gas chemical industry.
Background technology
Industrial elimination CO2It is an important process Deng sour gas.Containing substantial amounts of CO in the industrial gases such as such as flue gas, synthesis ammonia (with natural gas for raw material) and gas chemical industry2、H2The sour gas such as S, the sour gas in elimination industrial gases is the necessary links purifying raw material, preventing equipment corrosion, blocking and protection environment.
At present, the removing process major part of industrial sour gas is to absorb the sour gas (CO in industrial gases first with physically or chemically absorbent2、H2S, HCl etc.), then pass through the sour gas heated in absorption liquid and desorb, it is achieved absorb recycling of liquid, and the desorbing energy consumption of whole technique is to weigh the key index of this technique competitiveness and large-scale application prospect.Current industrial acid gas removal technique is mainly based on activative MDEA for absorbing the chemical absorption method of liquid, wherein packed tower is as absorption tower and desorber, but packed tower is bulky, liquid flooding, entrainment, tower corrosion phenomenon easily occur, and desorbing energy consumption is significantly high.
The major measure of industrial reduction desorbing energy consumption is to be thermally integrated desorption process to reach energy-conservation purpose.Patent CN200310109090 adopts rich solution parallel shunt mode heat exchange, reclaiming tower heat.CN102895860A does not separate CO by the rich solution obtained is divided into two stocks in the regenerator of two different pressures2, using the waste heat of rich solution high pressure desorption process as the thermal source of low pressure desorption process, thus reducing energy consumption.Although patent CN200310109090 and CN102895860A takes conservation measures to reduce energy consumption, but its consumption reduction degree is limited.US20100024645 uses ionic liquid as and absorbs the method that liquid separates gas in microchannel, and absorption reaction heat is used for desorption process by raising thermal efficiency mode, reduces additional-energy.Patent US20100024645 mainly emphasizes Energy harvesting, can not strengthen the desorption process absorbing liquid.
Summary of the invention:
It is an object of the invention to reduce the desorbing energy consumption of absorption solution of acid gases in microchannel, it is provided that the strengthening desorption method of a kind of sour gas is with separating acid gas regenerable absorbent liquid.
For achieving the above object, the technical solution used in the present invention is:
The present invention proposes the strengthening desorption method of a kind of sour gas, the method adopts indent grooved micro passage reaction strengthening desorption process, micro passage reaction includes tabular heat exchange unit and tabular desorption unit, tabular desorption unit is made up of parallel microchannel, it is characterized in that: in the upper surface of tabular desorption unit, it is perpendicular to the one or both sides, microchannel absorbing liquid flow direction and is respectively equipped with the groove of more than 1, groove is connected with microchannel, constitute indent grooved microchannel, the indent grooved microchannel of more than 2 is parallel, upper surface in tabular desorption unit constitutes parallel indent grooved microchannel.
In a kind of sour gas strengthening desorption method provided by the invention, groove cross section is shaped as rectangle, square, semicircle, U-shaped, trapezoidal or triangle, or both combination in any above, and described cross section refers to the cross section being parallel to flat board upper surface.
In a kind of sour gas strengthening desorption method provided by the invention, described indent grooved micro passage reaction is by upper cover plate, lower cover, and between upper cover plate, lower cover one or more than two desorption unit, one or more than two heat exchange unit layer stackup are combined into, desorption unit and heat exchange unit are slab construction, and desorption unit alternately superposes between upper cover plate and lower cover successively with heat exchange unit；The upper surface of each tabular desorption unit is equipped with the parallel indent grooved microchannel of more than 2 and constitutes, and passage end is provided with absorption liquid entrance, the other end is provided with stripping liquid and the biphase material outlet of carbon dioxide mix；Described tabular heat exchange unit is the micro-heat exchanger plates of multichannel or electric boiling plate；Upper surface in tabular heat exchange unit is equipped with the parallel heat exchange microchannel of more than 2, and one end, heat exchange microchannel is provided with heating medium inlet, the other end is provided with Crude product input, is referred to as the micro-heat exchanger plates of multichannel；On the side wall surface of tabular heat exchange unit, offer the electrical heating jack arranged in parallel of more than 2, be placed with electrical heating elements in electrical heating jack, be referred to as electric boiling plate.
In a kind of sour gas strengthening desorption method provided by the invention, described groove structure is: the interface width being connected with microchannel being parallel to flat board upper surface is 50～1000 microns, the seam that is connected with microchannel and be 50～1000 microns away from the degree of depth between interface bottom surface, the height being perpendicular to flat board upper surface is 100～3000 microns；In same indent grooved microchannel, the spacing of adjacent two inner groovy geometric centers is 100～3000 microns.
In a kind of sour gas strengthening desorption method provided by the invention, described microchannel is straight line, curve or meander line structure；Microchannel equivalent diameter is 50～3000 microns.
In a kind of sour gas strengthening desorption method provided by the invention, the quantity of each indent grooved microchannel further groove is 2 or more than 3, is evenly distributed on one or both sides, microchannel.
In a kind of sour gas strengthening desorption method provided by the invention, the electrical heating jack of electric boiling plate is evenly distributed on the one or both sides of electric boiling plate, and every side electrical heating jack is single file or plurality of rows, and the electrical heating jack degree of depth is more than the 1/2 of hot plate width.
In a kind of sour gas strengthening desorption method provided by the invention, in described indent grooved micro passage reaction, adopt the micro-heat exchanger plates of multichannel as heat exchange unit, it is provided with 4 through holes being perpendicular to planar surface, respectively as desorbing material and the access way adding thermal medium on indent grooved microchannel plate and the micro-heat exchanger plates of multichannel；Adopt electric boiling plate as heat exchange unit, on indent grooved microchannel plate and electric boiling plate, be provided with 2 through holes being perpendicular to planar surface, respectively as the access way of desorbing material；When heat exchange unit and indent grooved microchannel plate superposition, the lead to the hole site of respective fluid access way is mutually corresponding.
In a kind of sour gas strengthening desorption method provided by the invention, the liquid time of staying in inner groovy micro passage reaction that absorbs of described absorption sour gas is 0.01～100 second, desorption unit system pressure is 0.1～1MPa, desorption temperature is steady temperature, or be the thermograde positive along channel flow direction, 90～160 DEG C.
In a kind of sour gas strengthening desorption method provided by the invention, described absorption liquid is that absorption has CO2、H2S、SOx、NOx, a kind of in COS, HCl absorbent；Described absorbent is a kind of in organic amine MEA, DEA, MDEA, AMP or the organic amine of its compounding ingredients or interpolation activator, or described absorbent is a kind of in Physical Absorption liquid Allyl carbonate, methanol, NHD or its compounding ingredients, or described absorbent is a kind of in ionic liquid absorption liquid or its compounding ingredients, or described absorbent is a kind of in the alkaline absorption solutions such as ammonia spirit or its compounding ingredients.The absorption liquid of sour gas is technology known in those skilled in the art, and be in continually develop improve among, the present invention seeks to as providing a kind of sour gas strengthening desorption method, the desorption process at known all kinds of absorption absorption solution of acid gases all can adopt this method to strengthen further.
The positive effect of the present invention is:
(1) compared with the tower desorption system of tradition, desorption rate can improve 1～2 order of magnitude, and evaporated water reduces by 40%～95%, and desorption process energy consumption reduces by 20%～50%.
(2) sour gas adopting pressurized operation solution sucking-off can reduce compression energy consumption in follow-up compression transportation, and compression energy consumption reduces by 7%～10%.
(3) present invention introduces indent trench structure at microchannel desorption device, gas core can be provided to strengthen desorbing for the nucleation of bubble in absorption liquid desorption process, it is prevented that absorbent crosses thermal decomposition, it is achieved to absorb the efficient removal of sour gas in liquid.
(4) system bulk shortens 1～2 order of magnitude, and technique is simple, and operating flexibility is big, it is easy to controlling, the instantaneous volume of holding of reaction mass in response system is little, and process safety is high.
Desorption method in indent grooved micro passage reaction provided by the present invention is absent from liquid flooding, slug, has low energy consumption, volume is little, maintenance cost is low, be prone to the advantages such as amplification, can quickly realize the commercial Application of desorption process.Relative to tower desorption system, energy consumption can be reduced at least 20% by the desorption method in the present invention.
Accompanying drawing explanation
Fig. 1 is the process chart of the absorption liquid desorption method of acid gas-containing；
Fig. 2 is indent grooved micro passage reaction structure chart；
Fig. 3 is indent grooved structure chart in indent grooved micro passage reaction；
Fig. 4 is MCA figure in indent grooved micro passage reaction；
Fig. 5 is the micro-heat exchanger plates structure chart of multichannel of heat exchange unit；
Fig. 6 is the electric boiling plate structure chart of heat exchange unit.
Description of symbols:
In Fig. 1,1 is indent grooved micro passage reaction；2 is indent grooved micro passage reaction upper cover plate；3 is indent grooved micro passage reaction desorption unit；4 is indent grooved micro passage reaction heating unit；5 is indent grooved micro passage reaction lower cover；6 is pump；7 is the absorption liquid entrance of acid gas-containing；8 is stripping liquid and the biphase material outlet of carbon dioxide mix.
In Fig. 3,1 is rectangle, and 2 is square, and 3 is circular, and 4 is U-shaped, and 5 is trapezoidal；W and d respectively concave shaped structural openings width, the degree of depth in figure, l is adjacent two indent grooved structure pitch.
In Fig. 4,1 is rectangle and rectangle, and 2 is trapezoidal and rectangle, and 3 is trapezoidal, and 4 is rectangle, and 5 is broken line passage.
It should be noted that the identical or equivalent part of the finger present invention of accompanying drawing labelling, any amendment or replacement all can be considered in scope of the presently claimed invention；The specific design feature of selected accompanying drawing, such as size, angle, microchannel number, uses temperature and pressure etc., depends on concrete condition.
Detailed description of the invention:
Hereinafter with reference to accompanying drawing, the present invention is described in detail.Should be appreciated that the example of enforcement is only for illustrating the present invention, rather than in order to limit the scope of the invention.
The method of sour gas provided by the invention strengthening desorbing is as shown in Figure 1, described indent grooved micro passage reaction 1, its main body is by upper cover plate 2, lower cover 5, and desorption unit 3, the heat exchange unit 4 between upper cover plate, lower cover forms, desorption unit 3 and heat exchange unit 4 quantity are one or more, two units alternately superpositions.Each desorption unit 3 is constituted by along the multiple parallel indent grooved microchannel absorbing liquid flow direction, and passage two ends are respectively arranged with absorption liquid entrance 7 and stripping liquid and the biphase material outlet 8 of carbon dioxide mix；Each heat exchange unit 4 is comprised the micro-heat exchanger plates of multichannel of parallel microchannel by least one, or the electric boiling plate being comprised multiple electrical heating jack arranged in parallel by least one is constituted.
Embodiment 1: regeneration CO2Absorb liquid diethanolamine (DEA)
Under system pressurized conditions (P1,0.1～1MPa), carry out self-absorption CO2Diethanolamine (DEA) aqueous solution (temperature T1, CO2/ DEA mol ratio 0.32, absorb liquid concentration 30%DEA) it is conveyed into indent grooved micro passage reaction desorption unit 3 by pump 6, indent grooved micro passage reaction heat exchange unit 4 passes into high-pressure steam (T3,100～180 DEG C) heating indent grooved micro passage reaction 1, absorption liquid temp is made to be increased to desorption temperature (T4,90～160 DEG C), in the microchannel of indent trench structure, complete carbon dioxide from the desorbing absorbed liquid, and form stripping liquid and carbon dioxide mix two phase materials in exit.After measured, at system pressure 0.1MPa, the time of staying is 0.01 second, CO under 90～135 DEG C of conditions of desorption temperature2Eduction rate is 15%～100%.
Wherein, in indent grooved micro passage reaction desorption unit 3, indent trench structure is uniformly distributed in both sides, microchannel, cross sectional shape is rectangle, indent grooved structure width w is 200 microns, and degree of depth d is 500 microns, is highly 600 microns, adjacent two indent grooved structure pitch l are 1 millimeter, adjacent two indent grooved interstructural microchannel equivalent diameters are 750 microns, and channel shape is broken line, and its angle is 60 degree；The micro-hot plate equivalent diameter of multichannel of indent grooved micro passage reaction heat exchange unit 4 is 1000 microns, and cross sectional shape is rectangle.
Example 2: regeneration CO2Absorb liquid N methyldiethanol amine (MDEA)
To absorb CO2MDEA (CO2/ MDEA=0.40, absorbs liquid concentration 40%MDEA) for treating stripping liquid, desorbing in indent grooved microreactor described in example 1 and method.After measured, at system pressure 1MPa, the time of staying is 100 seconds, and desorption temperature is CO under 90～160 DEG C of conditions2Eduction rate is 40%～100%.
Example 3: regeneration CO2Composite absorption liquid methyl diethanolamine MDEA/ piperazine PZ
To absorb CO2MDEA/PZ (CO2/ MDEA=0.45, absorbs liquid concentration 35%MDEA+3%PZ) for treating stripping liquid, desorbing in method described in example 1.Wherein indent grooved structure width w is 50 microns, and degree of depth d is 500 microns, is highly 1000 microns, and adjacent two indent grooved structure pitch l are 5 millimeters, and adjacent two indent grooved interstructural microchannel equivalent diameters are 750 microns, and channel shape is rectangle.After measured, at system pressure 0.5MPa, the time of staying is 1 second, and desorption temperature is CO under 90～160 DEG C of conditions2Eduction rate is 50%～100%.
Should be noted that, the method of the sour gas strengthening desorbing in the present invention can according to actual situation, as absorbed liquid and the condition such as gaseous species, desorbing kind, change the factors such as the temperature in indent grooved micro passage reaction, flow, the time of staying, to reach the requirement of desorbing.
Claims (10)
1. the strengthening desorption method of a sour gas, the method adopts indent grooved micro passage reaction strengthening desorption process, micro passage reaction includes tabular heat exchange unit and tabular desorption unit, tabular desorption unit is made up of parallel microchannel, it is characterized in that: in the upper surface of tabular desorption unit, it is perpendicular to the one or both sides, microchannel absorbing liquid flow direction and is respectively equipped with the groove of more than 1, groove is connected with microchannel, constitute indent grooved microchannel, the indent grooved microchannel of more than 2 is parallel, upper surface in tabular desorption unit constitutes parallel indent grooved microchannel.
2. described in claim 1, strengthen desorption method, it is characterised in that:
Groove cross section is shaped as rectangle, square, semicircle, U-shaped, trapezoidal or triangle, or both combination in any above, and described cross section refers to the cross section being parallel to flat board upper surface.
3. described in claim 1, strengthen desorption method, it is characterised in that:
Described indent grooved micro passage reaction is by upper cover plate, lower cover, and between upper cover plate, lower cover one or more than two desorption unit, one or more than two heat exchange unit layer stackup are combined into, desorption unit and heat exchange unit are slab construction, and desorption unit alternately superposes between upper cover plate and lower cover successively with heat exchange unit；The upper surface of each tabular desorption unit is equipped with the parallel indent grooved microchannel of more than 2 and constitutes, and passage end is provided with absorption liquid entrance, the other end is provided with stripping liquid and the biphase material outlet of carbon dioxide mix；
Described tabular heat exchange unit is the micro-heat exchanger plates of multichannel or electric boiling plate；Upper surface in tabular heat exchange unit is equipped with the parallel heat exchange microchannel of more than 2, and one end, heat exchange microchannel is provided with heating medium inlet, the other end is provided with Crude product input, is referred to as the micro-heat exchanger plates of multichannel；On the side wall surface of tabular heat exchange unit, offer the electrical heating jack arranged in parallel of more than 2, be placed with electrical heating elements in electrical heating jack, be referred to as electric boiling plate.
4. described in claim 1 or 2, strengthen desorption method, it is characterised in that:
Described groove structure is: the interface width being connected with microchannel being parallel to flat board upper surface is 50～1000 microns, the seam that is connected with microchannel and be 50～1000 microns away from the degree of depth between interface bottom surface, the height being perpendicular to flat board upper surface is 100～3000 microns；In same indent grooved microchannel, the spacing of adjacent two inner groovy geometric centers is 100～3000 microns.
5. described in claim 3 or 4, strengthen desorption method, it is characterised in that:
Microchannel is straight line, curve or meander line structure；Microchannel equivalent diameter is 50～3000 microns.
6. described in claim 4, strengthen desorption method, it is characterised in that:
The quantity of each indent grooved microchannel further groove is 2 or more than 3, is evenly distributed on one or both sides, microchannel.
7. described in claim 3, strengthen desorption method, it is characterised in that:
The electrical heating jack of electric boiling plate is evenly distributed on the one or both sides of electric boiling plate, and every side electrical heating jack is single file or plurality of rows, and the electrical heating jack degree of depth is more than the 1/2 of hot plate width.
8. described in claim 3, strengthen desorption method, it is characterised in that:
In described indent grooved micro passage reaction,
Adopt the micro-heat exchanger plates of multichannel as heat exchange unit, on indent grooved microchannel plate and the micro-heat exchanger plates of multichannel, be provided with 4 through holes being perpendicular to planar surface, respectively as desorbing material and the access way adding thermal medium；
Adopt electric boiling plate as heat exchange unit, on indent grooved microchannel plate and electric boiling plate, be provided with 2 through holes being perpendicular to planar surface, respectively as the access way of desorbing material；
When heat exchange unit and indent grooved microchannel plate superposition, the lead to the hole site of respective fluid access way is mutually corresponding.
9. described in claim 3, strengthen desorption method, it is characterised in that:
Described absorption liquid passes into indent grooved micro passage reaction under 0.1～1MPa, liquid will be absorbed by heat exchange unit to heat to 90～160 DEG C, in the microchannel of indent trench structure, complete carbon dioxide from the desorbing absorbed liquid, and form stripping liquid and carbon dioxide mix two phase materials in exit.
10. described in claim 1 or 9, strengthen desorption method, it is characterised in that:
Absorbing 0.01～100 second time of staying in indent grooved micro passage reaction of liquid, described absorption liquid is that absorption has CO2、H2S、SOx、NOx, a kind of in COS, HCl absorbent；Described absorbent is a kind of in organic amine MEA, DEA, MDEA, AMP or its compounding ingredients, or described absorbent is a kind of in Physical Absorption liquid Allyl carbonate, methanol, NHD or its compounding ingredients, or described absorbent is a kind of in ionic liquid absorption liquid or its compounding ingredients, or described absorbent is a kind of in the alkaline absorption solutions such as ammonia spirit or its compounding ingredients.
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| CN201410799166.4A CN105749701A (en) | 2014-12-19 | 2014-12-19 | Reinforced desorption method of acidic gas |
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| CN201410799166.4A CN105749701A (en) | 2014-12-19 | 2014-12-19 | Reinforced desorption method of acidic gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109621863A (en) * | 2019-01-29 | 2019-04-16 | 临海市华南化工有限公司 | One kind being used for the brominated reaction unit in biphenyl derivatives Bian position and bromination process |
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| WO2009038472A1 (en) * | 2007-09-17 | 2009-03-26 | Sinvent As | Method and system for absorption of selective specific gaseous compounds from a fluid in a microchannel module, and screening of the absorbent mixture |
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