CN206823471U - A kind of MDEA biogas energy-saving decarbonation device - Google Patents
A kind of MDEA biogas energy-saving decarbonation device Download PDFInfo
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- CN206823471U CN206823471U CN201720318930.0U CN201720318930U CN206823471U CN 206823471 U CN206823471 U CN 206823471U CN 201720318930 U CN201720318930 U CN 201720318930U CN 206823471 U CN206823471 U CN 206823471U
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- Prior art keywords
- tower
- pipeline
- mdea
- pump
- semi
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- PVXVWWANJIWJOO-UHFFFAOYSA-N 1-(1,3-benzodioxol-5-yl)-N-ethylpropan-2-amine Chemical compound CCNC(C)CC1=CC=C2OCOC2=C1 PVXVWWANJIWJOO-UHFFFAOYSA-N 0.000 title claims abstract description 47
- QMMZSJPSPRTHGB-UHFFFAOYSA-N MDEA Natural products CC(C)CCCCC=CCC=CC(O)=O QMMZSJPSPRTHGB-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims abstract description 45
- 230000002745 absorbent Effects 0.000 claims abstract description 7
- 239000002250 absorbent Substances 0.000 claims abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 38
- 238000003795 desorption Methods 0.000 claims description 35
- 239000007788 liquid Substances 0.000 claims description 32
- 238000005262 decarbonization Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 16
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000001569 carbon dioxide Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 235000009508 confectionery Nutrition 0.000 abstract 1
- 238000005261 decarburization Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- -1 alcohol amines Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Gas Separation By Absorption (AREA)
Abstract
The utility model provides a kind of MDEA biogas energy-saving decarbonation device, including compressor (1), absorption tower (2), roturbo (3), flash column (4) and Analytic Tower (5)；Compressor (1) is connected by pipeline by pipeline and the absorbent inlet communication on absorption tower (2), the rich solution outlet of absorption tower (2) bottom through roturbo (3) with the top of flash column (4)；The rich solution outlet of flash column (4) bottom passes through pipeline communication Analytic Tower (5) top, Analytic Tower (5) bottom is provided with reboiler (6), and the semi lean solution outlet in the middle part of Analytic Tower (5) connects absorption tower (2) middle part with semi-leanpump (7) by pipeline.MDEA biogas energy-saving decarbonation device of the present utility model, energy consumption can be effectively reduced, improve the clearance pole of carbon dioxide in sweet gas, and use Automatic Control, it is stable, without manual operation, improve production efficiency.
Description
Technical Field
The utility model relates to a marsh gas decarbonization technical field especially relates to an energy-conserving decarbonization device of MDEA marsh gas.
Background
The main components of biogas are methane, carbon dioxide, small amounts of hydrogen sulfide, moisture and other components. The hydrogen sulfide in the biogas can seriously corrode pipelines, equipment and the like, and sulfur dioxide can be generated after the hydrogen sulfide is combusted, thereby causing serious pollution to the environment. Carbon dioxide in the biogas can reduce the combustion heat value of the biogas, so that the gas quality standard of pipeline natural gas and vehicle natural gas cannot be met, and the two components are generally removed in the treatment process of the biogas.
The existing common process for decarburization mainly adopts a chemical absorption method which mainly has the characteristics of good decarburization effect, mature technology and the like, wherein the amine decarburization method utilizes an amine-based absorbent and CO2CO is reacted2A method for removing. The alcohol amines widely used at present include monoethanolamine MEA, diethanolamine DEA, N-methyldiethanolamine MDEA, etc. The MDEA decarburization is used as a novel decarburization solvent, and is widely applied by the characteristics of simple process, large operation flexibility, higher selectivity, strong solution absorption capacity, low energy consumption, decarburization effect, high chemical stability, smaller degradability and corrosivity and the like.
However, in the existing MDEA decarburization process, the rich solution regeneration energy consumption is high, the energy cannot be effectively utilized, and the requirement of the current biogas decarburization and purification production cannot be met, so how to provide a biogas decarburization device which can effectively reduce the energy consumption of the system production and improve the removal rate of carbon dioxide becomes a technical problem to be solved urgently by technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the defects of the prior art, a MDEA marsh gas energy-saving decarbonization device with low energy consumption, high yield and high purity is provided.
The utility model discloses a solve above-mentioned technical problem and adopt following technical scheme:
the utility model provides an MDEA marsh gas energy-saving decarbonization device, which comprises a compressor 1, an absorption tower 2, a turbine pump 3, a flash tower 4 and an analytic tower 5; wherein, the compressor 1 is communicated with an absorbent inlet of the absorption tower 2 through a pipeline, and a rich liquid outlet at the bottom of the absorption tower 2 is communicated with the upper part of the flash tower 4 through the turbine pump 3 through a pipeline; the rich liquor outlet at the bottom of the flash tower 4 is communicated with the upper part of the desorption tower 5 through a pipeline, the bottom of the desorption tower 5 is provided with a reboiler 6, the semi-lean liquor outlet at the middle part of the desorption tower 5 is communicated with the middle part of the absorption tower 2 through a pipeline and a semi-lean liquor pump 7, the semi-lean liquor outlet is communicated with the stripping section on the desorption tower 5 through a pipeline and a solution pump 8, and the MDEA solution after the complete regeneration of the stripping section completely flows out of the lean liquor outlet at the bottom of the desorption tower 5 and enters the top of the absorption tower 2 through a pipeline and a lean liquor pump 9.
Further, in the MDEA biogas energy-saving decarbonization device, a lean solution/semi-lean solution heat exchanger 12 and a water cooler 13 are sequentially arranged on a connecting pipeline between the lean solution outlet and the lean solution pump 9.
Further, in the MDEA biogas energy-saving decarbonization device, a connecting pipeline between the stripping section on the desorption tower 5 and the solution pump 8 is communicated with the barren liquor/semi-barren liquor heat exchanger 12, so that barren liquor flowing out of the bottom of the desorption tower 5 exchanges heat with semi-barren liquor flowing out of the middle of the desorption tower 5 in the heat exchanger.
Further, in the MDEA marsh gas energy-saving decarbonization device, a connecting pipeline between the semi-lean liquid outlet and the semi-lean liquid pump 7 is communicated with the turbine pump 3.
Further, the MDEA marsh gas energy-saving decarbonization device also comprises CO communicated with the top of the desorption tower 5 through a pipeline2A liquid separation pump 10, the CO2The liquid outlet at the bottom of the liquid separating pump 10 passes through a pipeline and a flashThe vapor reflux pump 11 is communicated with the top of the desorption tower 5.
The utility model adopts the above technical scheme, compare with prior art, have following technological effect:
the MDEA marsh gas energy-saving decarbonization device adopts the two-stage absorption, decompression and stripping of barren solution and semi-barren solution to resolve and regenerate the flow, not only considers the absorption of the semi-barren solution to reduce the heat consumption, but also adopts the absorption of the barren solution to reduce the electricity consumption, effectively reduces the energy consumption of the whole system and reduces the whole investment of the device; the energy is recycled by adding the turbine pump; the absorption effect of carbon dioxide is very good, the removal rate is extremely high, the MDEA circulating liquid is thoroughly analyzed, and the consumption of the circulating liquid is reduced; in addition, the operation of the MDEA methane energy-saving decarbonization device adopts full-automatic control, is very stable, does not need manual operation, and improves the production efficiency; the number of easily damaged parts is small, the maintenance and management are very simple, unmanned management can be basically realized, workers only need to patrol whether the machine breaks down, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of the process flow of an MDEA biogas energy-saving decarbonization device of the utility model;
FIG. 2 is a schematic view of the overall structure of an MDEA biogas energy-saving decarbonization device of the utility model;
wherein, 1-compressor, 2-absorption tower, 3-turbine pump, 4-flash tower, 5-desorption tower, 6-reboiler, 7-semi-barren liquor pump, 8-solution pump, 9-barren liquor pump, 10-CO2Liquid separating pump, 11-flash reflux pump. 12-barren liquor/semi-barren liquor heat exchanger, 13-water cooler.
Detailed Description
As shown in figure 1, in the MDEA marsh gas energy-saving decarbonization device of the utility model, the whole MDEA marsh gas energy-saving decarbonization device is seen as a wholeThe device mainly comprises a pipeline system, an absorption device, a resolving device and a control system (not shown in the figure) for assisting the whole decarburization system, wherein biogas enters the lower part of the absorption device and flows from bottom to top after desulfurization, and is in countercurrent contact with MDEA (methyl methacrylate) absorption liquid flowing from top to bottom, and the MDEA absorbs CO2The purified biogas leaving the top of the absorption tower 2 after decarburization is cooled and separated and then enters a drying unit; wherein,
MDEA scrubbing of CO2The main chemical reactions that occur:
R2CH3N+CO2+H2O→R2CH3NH++HCO3 -
when a small amount of activator R' H is added to the MDEA solution, CO2The absorption was carried out as follows:
R’N+CO2→R2CH2N+HCO3-
R’COOH+R2CH3→NR2CH2N++HCO3 -
and simultaneously, desorbing the MDEA rich solution at the bottom of the absorption device by an analysis device to regenerate the MDEA lean solution which can be directly used as an absorbent of the absorption device.
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 2, the utility model provides an MDEA biogas energy-saving decarbonization device, which comprises a compressor 1, an absorption tower 2, a turbine pump 3, a flash tower 4 and an analytical tower 5, wherein the absorption tower 2 adopts a two-section absorption tower, and the analytical tower 5 adopts a two-section analytical tower; wherein, the compressor 1 is communicated with an absorbent inlet of the absorption tower 2 through a pipeline, and a rich liquid outlet at the bottom of the absorption tower 2 is communicated with the upper part of the flash tower 4 through a pipeline and a turbine pump 3; the rich liquor outlet at the bottom of the flash tower 4 is communicated with the upper part of the desorption tower 5 through a pipeline, the bottom of the desorption tower 5 is provided with a reboiler 6, the middle part of the absorption tower 2 is communicated with the semi-lean liquor outlet at the middle part of the desorption tower 5 through a pipeline and a semi-lean liquor pump 7, the semi-lean liquor outlet is communicated with the stripping section on the desorption tower 5 through a pipeline and a solution pump 8, and the MDEA solution completely regenerated by the stripping section completely flows out from the lean liquor outlet at the bottom of the desorption tower 5 and enters the top of the absorption tower 2 through a pipeline and a lean liquor pump 9.
As a preferred embodiment of the present invention, in the MDEA biogas energy-saving decarbonization apparatus, a lean solution/semi-lean solution heat exchanger 12 and a water cooler 13 are further sequentially disposed on a connection pipe between the lean solution outlet and the lean solution pump 9. Meanwhile, a connecting pipeline between a stripping section on the desorption tower 5 and the solution pump 8 is communicated with the barren solution/semi-barren solution heat exchanger, so that barren solution flowing out of the bottom of the desorption tower 5 exchanges heat with semi-barren solution flowing out of the middle of the desorption tower 5 in the heat exchanger, and energy recycling is realized.
On the basis of the technical scheme, in the MDEA methane energy-saving decarbonization device, a connecting pipeline between a semi-lean liquid outlet and a semi-lean liquid pump 7 is communicated with a turbine pump 3, a hydraulic turbine machine is added, and energy recycling can be realized.
On the basis of the technical scheme, the MDEA methane energy-saving decarbonization device also comprises CO communicated with the top of the desorption tower 5 through a pipeline2Liquid separating pump 10, CO2A liquid outlet at the bottom of the liquid separating pump 10 is communicated with the top of the desorption tower 5 through a pipeline and a flash reflux pump 11.
The working principle of the MDEA methane energy-saving decarbonization device of the utility model is as follows:
when the absorption tower is used, desulfurized biogas is conveyed to the lower part of the absorption tower 2, meanwhile, an absorbent (MDEA) is conveyed to a second-section inlet at the upper part of the absorption tower 2 through the compressor 1, the desulfurized biogas flows from bottom to top in the absorption tower 2 and is in countercurrent contact with MDEA absorption liquid flowing from top to bottom, and the MDEA absorbs CO2The purified biogas leaving the top of the absorption tower 2 after decarburization is cooled and separated and then enters a drying unit; the rich liquid (3.2Mpa) outlet in the absorption tower 2 is communicated with the turbine pump 3, after part of energy (0.9Mpa) is recovered, the rich liquid enters the flash tower 4 to release the absorbed hydrocarbon gas and part of CO2, and the rich MDEA solution in the flash tower 4 passes through the rich liquid at the bottomThe outlet enters a desorption tower 5 for further desorption at normal pressure, and the desorption tower 5 is in countercurrent contact with steam from a stripping section, and most of CO2After being resolved, most of the half-barren liquor at the first section of the resolving tower 5 (73 ℃) is lifted by a half-barren liquor pump 7 and then is sent to the middle part of the absorption tower 2, and a small part of the half-barren liquor is lifted by a solution pump 8 and exchanges heat with barren liquor flowing out from the bottom of the resolving tower 5 in a barren liquor/half-barren liquor heat exchanger 12 to 104 ℃, and then is completely regenerated through a stripping section of the resolving tower 5; the completely regenerated MDEA solution (114 ℃) completely flows out from a barren liquor outlet at the bottom of the desorption tower 5, exchanges heat with the semi-barren liquor in a barren liquor/semi-barren liquor heat exchanger 12, the temperature is reduced to 80 ℃, the solution is cooled to 50 ℃ by a water cooler 13 and then is pressurized by a barren liquor pump 9, the pressurized MDEA barren liquor enters one section of the top of the absorption tower, a circulating MDEA absorption liquid is circularly analyzed, the analysis is thorough, the consumption of circulating liquid is reduced, the steps are repeated, the production energy consumption of methane decarburization can be effectively reduced, and the removal rate of carbon dioxide is improved.
The present invention has been described in detail with reference to the specific embodiments, but the present invention is only by way of example and is not limited to the specific embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are intended to be within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (5)
1. An MDEA marsh gas energy-saving decarbonization device is characterized by comprising a compressor (1), an absorption tower (2), a turbine pump (3), a flash tower (4) and an analysis tower (5); the compressor (1) is communicated with an absorbent inlet of the absorption tower (2) through a pipeline, and a rich liquid outlet at the bottom of the absorption tower (2) is communicated with the upper part of the flash tower (4) through the turbine pump (3) through a pipeline; the rich liquor outlet at the bottom of the flash tower (4) is communicated with the upper part of the desorption tower (5) through a pipeline, a reboiler (6) is arranged at the bottom of the desorption tower (5), a semi-barren liquor outlet at the middle part of the desorption tower (5) is communicated with the middle part of the absorption tower (2) through a pipeline and a semi-barren liquor pump (7), the semi-barren liquor outlet is communicated with a stripping section on the desorption tower (5) through a pipeline and a solution pump (8), and MDEA solution completely regenerated by the stripping section completely flows out from the barren liquor outlet at the bottom of the desorption tower (5) and enters the top of the absorption tower (2) through a pipeline and a barren liquor pump (9).
2. The MDEA biogas energy-saving decarbonization device according to claim 1, characterized in that a lean solution/semi-lean solution heat exchanger (12) and a water cooler (13) are further arranged on the connecting pipeline between the lean solution outlet and the lean solution pump (9) in sequence.
3. The MDEA biogas energy-saving decarbonization device according to claim 2, characterized in that the connecting pipe between the stripping section on the desorption tower (5) and the solution pump (8) communicates with the lean liquid/semi-lean liquid heat exchanger (12), so that the lean liquid flowing out from the bottom of the desorption tower (5) exchanges heat with the semi-lean liquid flowing out from the middle of the desorption tower (5) in the heat exchanger.
4. The MDEA biogas energy-saving decarbonization device according to claim 1, characterized in that the connecting pipe between the semi-lean liquid outlet and the semi-lean liquid pump (7) communicates with the turbine pump (3).
5. The MDEA biogas energy-saving decarbonization device of claim 1, further comprising CO communicated with the top of the desorption tower (5) through a pipeline2A liquid separation pump (10), the CO2A liquid outlet at the bottom of the liquid separating pump (10) is communicated with the top of the desorption tower (5) through a pipeline and a flash reflux pump (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720318930.0U CN206823471U (en) | 2017-03-29 | 2017-03-29 | A kind of MDEA biogas energy-saving decarbonation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720318930.0U CN206823471U (en) | 2017-03-29 | 2017-03-29 | A kind of MDEA biogas energy-saving decarbonation device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113041799A (en) * | 2021-03-12 | 2021-06-29 | 中国华能集团清洁能源技术研究院有限公司 | IGCC-based pre-combustion CO2Pressure energy recovery device of trapping system |
| CN113717758A (en) * | 2021-08-27 | 2021-11-30 | 山东津挚环保科技有限公司 | Synthetic gas desulfurization and decarbonization system |
| CN114225623A (en) * | 2022-02-25 | 2022-03-25 | 中国华能集团清洁能源技术研究院有限公司 | Carbon capture system |
-
2017
- 2017-03-29 CN CN201720318930.0U patent/CN206823471U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113041799A (en) * | 2021-03-12 | 2021-06-29 | 中国华能集团清洁能源技术研究院有限公司 | IGCC-based pre-combustion CO2Pressure energy recovery device of trapping system |
| CN113717758A (en) * | 2021-08-27 | 2021-11-30 | 山东津挚环保科技有限公司 | Synthetic gas desulfurization and decarbonization system |
| CN113717758B (en) * | 2021-08-27 | 2024-02-09 | 山东津挚环保科技有限公司 | Desulfurization and decarbonization system for synthesis gas |
| CN114225623A (en) * | 2022-02-25 | 2022-03-25 | 中国华能集团清洁能源技术研究院有限公司 | Carbon capture system |
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