CN217909691U - Energy-saving and water-saving carbon capture device - Google Patents
Energy-saving and water-saving carbon capture device Download PDFInfo
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- CN217909691U CN217909691U CN202221349760.XU CN202221349760U CN217909691U CN 217909691 U CN217909691 U CN 217909691U CN 202221349760 U CN202221349760 U CN 202221349760U CN 217909691 U CN217909691 U CN 217909691U
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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 utility model provides an energy-saving and water-saving carbon trapping device, which comprises a desulfurization unit, an absorption tower and a desorption tower, wherein the desulfurization unit is provided with a flue gas inlet and a flue gas outlet, and the flue gas outlet is connected with the flue gas inlet arranged on the absorption tower; an MEA lean solution inlet is formed in the absorption tower and connected with an MEA lean solution outlet formed in the desorption tower; an MEA rich liquid outlet formed in the absorption tower is connected with an MEA rich liquid inlet formed in the desorption tower; a carbon dioxide outlet is formed in the desorption tower; the utility model discloses can improve CO 2 The absorption rate is equivalent to the reduction of the trapping energy consumption; simultaneously, can effectively reduce the whole water consumption of system.
Description
Technical Field
The utility model belongs to the environment field, concretely relates to energy-conserving water conservation's carbon entrapment device.
Background
Climate warming has attracted close global attention, CO 2 Is one of the most prominent greenhouse gases in the atmosphere. As a key industry for carbon dioxide emission, the flue gas tail gas of each thermal power plant in the power industry contains a large amount of carbon dioxide, and is directly discharged to the atmosphere in the current process flow. Along with the establishment of the national carbon emission right trading market, the carbon emission is comprehensively and directly related to the economic benefits of enterprises, and CO is captured 2 The demand for (2) is gradually rising.
The MEA monoethanolamine method is a common method for capturing CO2, and realizes regeneration circulation through the absorption and desorption of MEA, but a high-temperature heat source is required in the regeneration process, and a steam turbine of a power plant is generally adopted for steam extraction, so that the overall energy consumption of the technology is high. Meanwhile, the flue gas temperature at the outlet of the wet desulphurization tower of the coal-fired power plant is higher than the requirement of the MEA (membrane electrode assembly) process on the flue gas temperature, and the CO2 absorption rate is low.
For a cogeneration unit, recovering the waste heat in the system is one of the best ways to increase the heating capacity without upsizing the unit. At present, a water spraying method is usually adopted for a power plant to reduce the temperature of flue gas to 50-60 ℃ for emission, and heat in the flue gas is not recovered, so that energy waste is caused.
CN 109454620A discloses a coupling device for carbon capture and waste heat recovery, which utilizes an absorption tower and a desorption tower to capture and store CO2 in high-temperature flue gas discharged from industry, and performs a certain waste heat recovery. But the flue gas temperature of the absorption tower in the scheme is higher, the CO2 absorption rate is low, and the water-saving effect is not achieved.
Disclosure of Invention
The utility model aims at providing an energy-conserving water conservation's carbon entrapment device has solved among the prior art absorption tower entry flue gas temperature height, CO 2 The absorption rate is low, and meanwhile, in the prior art, only energy conservation is considered, and water conservation of a system is not considered.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model provides an energy-saving and water-saving carbon trapping device, which comprises a desulfurization unit, an absorption tower and a desorption tower, wherein the desulfurization unit is provided with a flue gas inlet and a flue gas outlet, and the flue gas outlet is connected with the flue gas inlet arranged on the absorption tower;
an MEA lean solution inlet is formed in the absorption tower and connected with an MEA lean solution outlet formed in the desorption tower;
an MEA rich liquid outlet formed in the absorption tower is connected with an MEA rich liquid inlet formed in the desorption tower;
and a carbon dioxide outlet is formed in the desorption tower.
Preferably, the desulfurization unit comprises a desulfurization tower and a flash tank, wherein the desulfurization tower is provided with a flue gas inlet and a flue gas outlet, and the flue gas outlet is connected with a flue gas inlet arranged on the absorption tower; a slurry outlet formed in the desulfurizing tower is connected with a slurry inlet formed in the flash tank; and a slurry outlet formed in the flash tank is connected with a slurry inlet on the desulfurizing tower.
Preferably, a second heat exchange unit is arranged between the slurry outlet formed in the desulfurizing tower and the slurry inlet formed in the flash tank.
Preferably, the second heat exchange unit is a heat exchanger.
Preferably, the heat exchange unit comprises an absorption heat pump and a lean-rich liquid heat exchanger, wherein an MEA rich liquid outlet formed in the absorption tower sequentially passes through the lean-rich liquid heat exchanger and the absorption heat pump and is connected with an MEA rich liquid inlet formed in the desorption tower;
an MEA barren solution outlet arranged on the desorption tower is connected with an MEA barren solution inlet arranged on the absorption tower through a barren-rich solution heat exchanger and a heat exchanger in sequence.
Preferably, the absorption heat pump is provided with a driving steam inlet and a second condensed water outlet, and the second condensed water outlet is connected with a water purifying tank.
Preferably, the steam outlet of the desulfurization unit is connected with the steam inlet on the absorption heat pump; and a first condensate water outlet formed in the absorption heat pump is connected with a condensate water inlet formed in the desorption tower.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of carbon entrapment device of energy-conserving water conservation through the desulfurization thick liquid flash distillation, reduces the desulfurization thick liquid temperature to reduce desulfurizing tower exhaust flue gas temperature, effectively improve in the absorption tower CO in the flue gas 2 The absorption rate of (c). The heat is extracted from the desulfurization slurry through the flash evaporation of the desulfurization slurry, the heat in the flue gas is actually utilized, and the part of heat is used for heating the MEA rich solution after being upgraded by the absorption heat pump, so that the consumption of the power plant steam in the MEA regeneration process can be effectively reduced, and the regeneration energy consumption is reduced. The low-temperature desulfurized slurry after flash evaporation is used as a cold source to further cool the MEA rich solution and improve CO 2 Absorption ofThe rate is equivalent to the reduction of the trapping energy consumption.
Furthermore, flash steam condensate is sent to the desorption tower to be used as water supplement, and the overall water consumption of the system is effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides an energy-saving and water-saving carbon capture device, which comprises a desulfurization unit, an absorption tower 2 and a desorption tower 3, wherein the desulfurization unit is provided with a flue gas inlet and a flue gas outlet, and the flue gas outlet is connected with the flue gas inlet arranged on the absorption tower 2;
an MEA lean solution inlet is formed in the absorption tower 2 and connected with an MEA lean solution outlet formed in the desorption tower 3;
an MEA rich liquid outlet formed in the absorption tower 2 is connected with an MEA rich liquid inlet formed in the desorption tower 3;
and a carbon dioxide outlet is formed in the desorption tower 3.
As shown in fig. 1, the utility model provides a pair of energy-conserving water-saving carbon entrapment device, including desulfurizing tower 1, absorption tower 2, desorber 3, flash tank 4, absorption heat pump 5, heat exchanger 6, poor-rich liquid heat exchanger 7, flue gas 8, high temperature desulfurization thick liquid 9, saturated wet flue gas 10, low temperature desulfurization thick liquid 11, flash steam 12, comdenstion water 13, drive steam 14, comdenstion water 15, MEA rich liquid 16, high temperature rich liquid 18, MEA lean liquid 19, rich CO 2 Gas 20 and flue gas 21, wherein:
the desulfurizing tower 1 is provided with a flue gas inlet and a slurry outlet, and the slurry outlet is connected with a slurry inlet arranged on the flash tank 4.
And a steam outlet formed in the flash tank 4 is connected with a steam inlet formed in the absorption heat pump 5.
And a slurry outlet formed in the flash tank 4 is connected with a slurry inlet formed in the desulfurizing tower 1 through a heat exchanger 6.
The absorption heat pump 5 is provided with a driving steam inlet and a second condensate outlet, and the second condensate outlet is connected with the water purifying tank.
The absorption heat pump 5 is provided with a first condensate outlet which is connected with a condensate inlet on the desorption tower 3.
And a flue gas outlet formed in the desulfurizing tower 1 is connected with a flue gas inlet formed in the absorption tower 2.
An MEA lean solution outlet arranged on the desorption tower 3 is connected with an MEA lean solution inlet on the absorption tower 2 through a lean-rich solution heat exchanger 7 and a heat exchanger 6 in sequence.
An MEA rich liquid outlet formed in the absorption tower 2 is connected with an MEA rich liquid inlet formed in the desorption tower 3 through a lean-rich liquid heat exchanger 7 and an absorption heat pump 5 in sequence.
And a carbon dioxide outlet is formed in the desorption tower 3.
The utility model discloses a working process:
the flue gas 8 enters the desulfurizing tower 1 to exchange heat with low-temperature desulfurizing slurry sprayed from the top of the tower and is purified, and the flue gas is cooled and humidified; the high-temperature desulfurization slurry 9 at the bottom of the desulfurization tower 1 enters a flash tank 4, flash evaporation is carried out in a vacuum environment, flash steam 12 and low-temperature desulfurization slurry 11 are generated, and heat is transferred from the desulfurization slurry to the flash steam.
The flash steam 12 enters an absorption heat pump 5, and is upgraded by using driving steam 14, and the MEA rich solution is heated.
The driving steam is condensed into condensed water 15 in the absorption heat pump 5 and returns to the clean water tank, and the flash steam 12 is condensed into condensed water 13 and enters the desorption tower 3.
The purified saturated wet flue gas 10 enters an absorption tower 2 to be in countercurrent contact with MEA barren solution sprayed from the top of the tower, and CO in the flue gas 2 Is absorbed, CO 2 The absorbed flue gas 21 is discharged from the top of the absorption tower.
The MEA rich solution 16 is discharged from the tower bottom of the absorption tower 2, is heated by the lean-rich solution heat exchanger 7, enters the absorption heat pump 5, is further heated to be high-temperature rich solution 18, and enters the desorption tower 3 for desorption.
The desorbed MEA lean solution 19 is cooled by the lean-rich solution heat exchanger 7, then is subjected to further heat exchange and cooling with the low-temperature desulfurization slurry in the heat exchanger 6, and then enters the absorption tower 2 for circulation.
Desorbed CO-rich 2 The gas 20 is discharged from the top of the tower and is compressed and condensed to obtain high-purity CO 2 。
The utility model discloses an effect as follows:
1. through the flash evaporation of the desulfurization slurry, the temperature of the desulfurization slurry is reduced, so that the temperature of the flue gas discharged by the desulfurization tower is reduced, and the absorption rate of CO2 in the flue gas in the absorption tower is effectively improved.
2. Heat is extracted from the desulfurization slurry through the flash evaporation of the desulfurization slurry, the heat in the flue gas is actually utilized, and the part of heat is upgraded by an absorption heat pump and then is used for heating MEA rich solution, so that the consumption of steam of a power plant in the MEA regeneration process can be effectively reduced, and the regeneration energy consumption is reduced.
3. The low-temperature desulfurized slurry after flash evaporation is used as a cold source to further cool the MEA rich solution and improve CO 2 The absorption rate is equivalent to the reduction of the trapping energy consumption.
4. The flash steam condensate is sent to the desorption tower to be used as water supplement, and the integral water consumption of the system is effectively reduced.
The utility model discloses a desulfurization thick liquid flash distillation reduces desulfurization thick liquid temperature to reduce desulfurizing tower exhaust gas temperature, effectively improve in the absorption tower CO in the flue gas 2 The absorption rate of (c). The heat is extracted from the desulfurization slurry through the flash evaporation of the desulfurization slurry, the heat in the flue gas is actually utilized, and the part of heat is used for heating the MEA rich solution after being upgraded by the absorption heat pump, so that the consumption of the power plant steam in the MEA regeneration process can be effectively reduced, and the regeneration energy consumption is reduced. The low-temperature desulfurized slurry after flash evaporation is used as a cold source to further cool the MEA rich solution and improve CO 2 The absorption rate is equivalent to the reduction of the trapping energy consumption. The flash steam condensate is sent to the desorption tower to be used as water supplement, and the integral water consumption of the system is effectively reduced.
Claims (8)
1. The energy-saving and water-saving carbon capture device is characterized by comprising a desulfurization unit, an absorption tower (2) and a desorption tower (3), wherein the desulfurization unit is provided with a flue gas inlet and a flue gas outlet, and the flue gas outlet is connected with the flue gas inlet formed in the absorption tower (2);
an MEA lean solution inlet is formed in the absorption tower (2) and is connected with an MEA lean solution outlet formed in the desorption tower (3);
an MEA rich liquid outlet formed in the absorption tower (2) is connected with an MEA rich liquid inlet formed in the desorption tower (3);
and a carbon dioxide outlet is formed in the desorption tower (3).
2. The energy-saving and water-saving carbon capture device according to claim 1, wherein the desulfurization unit comprises a desulfurization tower (1) and a flash tank (4), wherein a flue gas inlet and a flue gas outlet are formed in the desulfurization tower (1), and the flue gas outlet is connected with a flue gas inlet formed in the absorption tower (2); a slurry outlet formed in the desulfurizing tower (1) is connected with a slurry inlet formed in the flash tank (4); and a slurry outlet arranged on the flash tank (4) is connected with a slurry inlet on the desulfurizing tower (1).
3. The energy-saving and water-saving carbon capture device according to claim 2, wherein a second heat exchange unit is arranged between a slurry outlet formed in the desulfurizing tower (1) and a slurry inlet formed in the flash tank (4).
4. An energy and water saving carbon capture device according to claim 3, wherein the second heat exchange unit is a heat exchanger (6).
5. The energy-saving and water-saving carbon capture device according to claim 4, wherein a first heat exchange unit is arranged between the MEA rich liquid outlet formed on the absorption tower (2) and the MEA rich liquid inlet formed on the desorption tower (3).
6. The energy-saving and water-saving carbon capture device according to claim 5, wherein the first heat exchange unit comprises an absorption heat pump (5) and a lean-rich liquid heat exchanger (7), wherein an MEA rich liquid outlet formed on the absorption tower (2) is connected with an MEA rich liquid inlet formed on the desorption tower (3) through the lean-rich liquid heat exchanger (7) and the absorption heat pump (5) in sequence;
an MEA barren liquor outlet formed in the desorption tower (3) is connected with an MEA barren liquor inlet formed in the absorption tower (2) through a barren-rich liquor heat exchanger (7) and a heat exchanger (6) in sequence.
7. The energy-saving and water-saving carbon capture device according to claim 6, wherein the absorption heat pump (5) is provided with a driving steam inlet and a second condensed water outlet, and the second condensed water outlet is connected with a clean water tank.
8. The energy-saving and water-saving carbon capture device according to claim 6, wherein the steam outlet of the desulfurization unit is connected with the steam inlet of the absorption heat pump (5); a first condensed water outlet arranged on the absorption heat pump (5) is connected with a condensed water inlet arranged on the desorption tower (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221349760.XU CN217909691U (en) | 2022-05-31 | 2022-05-31 | Energy-saving and water-saving carbon capture device |
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| CN202221349760.XU CN217909691U (en) | 2022-05-31 | 2022-05-31 | Energy-saving and water-saving carbon capture device |
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| CN217909691U true CN217909691U (en) | 2022-11-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138181A (en) * | 2022-05-31 | 2022-10-04 | 华能营口热电有限责任公司 | Energy-saving and water-saving carbon capture device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138181A (en) * | 2022-05-31 | 2022-10-04 | 华能营口热电有限责任公司 | Energy-saving and water-saving carbon capture device and method |
| CN115138181B (en) * | 2022-05-31 | 2024-11-01 | 华能营口热电有限责任公司 | Energy-saving water-saving carbon trapping device and method |
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