Equipment for comprehensively utilizing condensation residual cold in carbon capture system

Abstract

The utility model discloses equipment for comprehensively utilizing condensation residual cold in a carbon capture system. The equipment comprises an absorption unit, a condensation residual cold recovery unit and a regeneration unit, the absorption unit comprises a flue gas inlet, an absorption section lower filler, a first nozzle, a collecting disc, an absorption section upper filler and a second nozzle which are arranged at the lower part of the absorption tower from bottom to top; the condensation residual cold recovery unit comprises a liquid accumulation disc, a tail gas washing section filler, a third nozzle, a demister and a tail gas outlet which are arranged at the upper part of the absorption tower from bottom to top; and the regeneration unit comprises a regeneration tower, a regenerated gas cooler, a gas-liquid separator and a regenerated gas-liquid pump. Tail gas condensate output by the condensation residual cold recovery unit and semi-pregnant solution output by the absorption unit are subjected to heat exchange in a condensation residual cold heat exchanger, so that the temperature of the semi-pregnant solution is reduced, and the absorption capacity of the absorption solution is improved; and regenerated gas condensed water output by the regeneration tower and tail gas condensed liquid output by the condensation residual cold recovery unit are fed into the regeneration tower, and regenerated gas heat is recovered at the top of the regeneration tower through cold liquid, so that the regeneration energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of carbon capture technology, and in particular to a device for comprehensively utilizing condensate waste heat in a carbon capture system. Background Technology

[0002] CO2 has the greatest impact among greenhouse gases, accounting for about 60% of all greenhouse gas contributions. CO2 capture, utilization and storage (CCUS) technology is currently the mainstream technology route and the most effective and economically feasible way to achieve CO2 emission reduction. Among them, post-combustion capture does not require the modification of existing thermal power plants and is currently a research hotspot. Chemical absorption is the most mature technology in post-combustion capture and has the greatest application potential.

[0003] For example, Chinese patent document CN116510469A discloses a carbon dioxide capture tower, which includes a pre-washing and impurity removal section, a carbon dioxide absorption section and a flue gas scrubbing section arranged vertically from bottom to top, so that the flue gas can flow through the pre-washing and impurity removal section, the carbon dioxide absorption section and the flue gas scrubbing section in sequence. A carbon dioxide capture tower flue gas inlet is provided on the pre-washing and impurity removal section and a carbon dioxide capture tower flue gas outlet is provided on the scrubbing section.

[0004] In actual operation, due to the exothermic reaction between the lean absorbent solution and CO2 in the flue gas in the absorption tower, some absorbent escapes into the atmosphere in the form of volatilization or aerosol with the decarbonized flue gas. The absorbent undergoes oxidative or thermal degradation, which can lead to the formation of carcinogens such as nitrosamines and nitrosamines, thereby damaging organisms in the soil and polluting drinking water sources.

[0005] Furthermore, due to the high market price of absorbents, absorbent escape leads to a sharp increase in the operating costs of carbon capture systems. Therefore, it is essential to control amine escape generated by carbon capture systems to reduce emissions. However, while the traditional control method—water washing—can effectively reduce the volatile emissions of amine escape from carbon capture systems, it is ineffective at removing amines escaped in the form of aerosols, resulting in unsatisfactory emission control. Utility Model Content

[0006] This invention provides a device for a carbon capture system that comprehensively utilizes residual condensation heat, which can lower the temperature during the absorption process and thus enhance the absorption process.

[0007] A carbon capture system that comprehensively utilizes condensate waste heat includes an absorption unit, a condensate waste heat recovery unit, and a regeneration unit;

[0008] The absorption unit includes, from bottom to top, a flue gas inlet, a lower packing of the absorption section, a No. 1 nozzle, a collection tray, an upper packing of the absorption section, and a No. 2 nozzle, arranged in the lower part of the absorption tower.

[0009] The condensation and waste cooling recovery unit includes a liquid collection tray, tail gas scrubbing section packing, No. 3 nozzle, demister and tail gas outlet arranged from bottom to top on the upper part of the absorption tower;

[0010] The regeneration unit includes a regeneration tower, a regeneration gas cooler, a gas-liquid separator, and a regeneration gas-liquid pump;

[0011] The outlet of the collection tray is connected in sequence to the semi-rich liquid storage tank, the semi-rich liquid storage tank pump, the first channel of the condensate waste heat exchanger, and the first nozzle via pipelines.

[0012] The outlet of the condensate pan is connected to the condensate storage tank and the condensate storage tank pump in sequence through pipelines, and then splits into two paths. One path is connected to the inlet of the regeneration tower through a pipeline, and the other path is connected to the second channel of the condensate waste heat exchanger, the first channel of the cooler, and the third nozzle in sequence through pipelines.

[0013] The gas outlet of the regeneration tower is sequentially connected via pipeline to the first channel of the regeneration gas cooler, the gas-liquid separator, the regeneration gas-liquid pump, and the liquid inlet of the regeneration tower.

[0014] Furthermore, the inlet of the second nozzle is connected to the outlet of the regeneration tower.

[0015] Preferably, the condensation residual heat exchanger is a plate heat exchanger.

[0016] Preferably, the condensate residual heat exchanger, cooler, and regenerated gas cooler all adopt a counter-current heat exchange structure for hot and cold fluids.

[0017] Preferably, the second channel of the cooler and the second channel of the regenerated gas cooler are both connected to a cooling water circulation pipeline.

[0018] Preferably, the demister is a wire mesh demister.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This utility model recovers the cold energy in the tail gas condensate by setting a condensation waste heat recovery unit in the condensation waste heat exchanger, reduces the semi-rich liquid temperature, and lowers the absorption process temperature, thereby strengthening the absorption process and making comprehensive use of condensation waste heat.

[0021] 2. This utility model reduces regeneration energy consumption by directing the regenerated gas condensate in the gas-liquid separator and the tail gas condensate in the condensate storage tank to the regeneration tower, and recovering the heat of the regenerated gas through the cold liquid at the top of the regeneration tower. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a carbon capture system that comprehensively utilizes residual condensation heat according to this utility model.

[0023] In the diagram: 11-Flue gas inlet; 12-Absorber tower; 13-Lower packing of absorber section; 14-No. 1 nozzle; 15-Collection tray; 16-Upper packing of absorber section; 17-Semi-rich liquid storage tank; 18-Semi-rich liquid storage tank pump; 19-Condensation waste heat exchanger; 110-No. 2 nozzle; 21-Liquid collection tray; 22-Packing of tail gas scrubbing section; 23-No. 3 nozzle; 24-Tail gas outlet; 25-Cooler; 26-Condensate storage tank; 27-Condensate storage tank pump; 28-Demister; 31-Regeneration tower; 32-Regeneration gas cooler; 33-Gas-liquid separator; 34-Regeneration gas-liquid pump. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments described below are intended to facilitate the understanding of the present invention and do not limit it in any way.

[0025] like Figure 1 As shown, a carbon capture system is a device that comprehensively utilizes condensate waste heat, including an absorption unit, a condensate waste heat recovery unit, and a regeneration unit.

[0026] The absorption unit includes an absorption tower 12, a flue gas inlet 11, absorption section packing, a first nozzle 14, a second nozzle 110, a semi-rich liquid storage tank 17, a semi-rich liquid storage tank pump 18, and a collection tray 15. The absorption section packing includes upper absorption section packing 16 and lower absorption section packing 13; the absorption unit consists of lower absorption section packing 13, first nozzle 14, collection tray 15, upper absorption section packing 16, and second nozzle 110 arranged from bottom to top on the absorption tower 12.

[0027] The packing material is a 500Y stainless steel perforated corrugated integrated packing plate. The diameter of the small holes is 3-5 mm, the hole spacing is uniformly distributed, the plate spacing is 5-10 mm, the liquid holdup is 0.2-0.3 kg / m³, the porosity is 92%, and each meter of packing height can provide 4-4.5 theoretical plates. The pressure drop of each theoretical stage is 400 Pa, and the height of each packing section is 1.5 m. Each packing plate is typically 1000 mm × 1000 mm (1 m × 1 m) in size and 1-2 mm thick. Multiple packing plates are assembled into a packing disc by welding or riveting, and the diameter of the packing disc matches the inner diameter of the absorption tower. A support plate is installed inside the absorption tower to support the packing disc. The support plate is made of the same material as the packing to ensure overall corrosion resistance. A pressure plate is installed above the packing disc to prevent displacement of the packing during operation. The pressure plate is also made of stainless steel.

[0028] The semi-rich liquid storage tank pump 18 is connected to the semi-rich liquid storage tank 17 and the condensate heat exchanger 19; the semi-rich liquid storage tank 17 can store the absorbent liquid from the collection tray 15.

[0029] No. 2 nozzle 110 can spray fresh absorbent from the outlet of regeneration tower 31.

[0030] The condenser waste heat exchanger 19 is designed as a plate heat exchanger, with countercurrent heat exchange between the hot and cold fluids. The cold fluid inside the condenser waste heat exchanger 19 is the tail gas condensate in the condensate storage tank 26; the hot fluid inside the condenser waste heat exchanger 19 is the semi-rich liquid in the semi-rich liquid storage tank 17.

[0031] The condensation waste heat recovery unit includes a condensate collection tray 21, tail gas scrubbing section packing 22, No. 3 nozzle 23, tail gas outlet 24, demister 28, cooler 25, condensate storage tank 26, condensate storage tank pump 27, and condensation waste heat exchanger 19. The condensation waste heat recovery unit is designed from bottom to top in the absorption tower 12, including the condensate collection tray 21, tail gas scrubbing section packing 22, No. 3 nozzle 23, and tail gas outlet 24. The cooler 25 can utilize circulating water for cooling.

[0032] The condensate tray 21 is connected to the condensate storage tank 26, which can store the tail gas condensate condensed by the packing 22 of the tail gas scrubbing section. The condensate storage tank pump 27 is connected to the condensate storage tank 26, the condensate waste heat exchanger 19 and the regeneration tower 31, and can guide the liquid in the condensate storage tank 26 to the condensate waste heat exchanger 19 and the regeneration tower 31.

[0033] The demister 28 is a wire mesh demister, and the thickness of the wire mesh demister is adjustable.

[0034] The regeneration unit includes a regeneration tower 31, a regeneration gas cooler 32, a gas-liquid separator 33, and a regeneration gas-liquid pump 34. The regeneration tower 31 can release carbon dioxide from the rich liquid by changing the temperature and pressure. The regeneration gas cooler 32 is designed at the gas outlet of the regeneration tower 31 to cool the regeneration gas.

[0035] The gas-liquid separator 33 can separate the gas and liquid generated after the regeneration gas is cooled. The gas-liquid separator 33 is connected to the regeneration gas-liquid pump 34, which is connected to the outlet of the condensate storage tank pump 27, and can send the regeneration gas and liquid back to the regeneration tower 31.

[0036] The embodiments described above provide a detailed explanation of the technical solution and beneficial effects of this utility model. It should be understood that the above descriptions are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, additions, and equivalent substitutions made within the scope of the principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A carbon capture system that comprehensively utilizes condensate waste heat, characterized in that, It includes an absorption unit, a condensate waste heat recovery unit, and a regeneration unit; The absorption unit includes a flue gas inlet (11), a lower packing (13) of the absorption section, a first nozzle (14), a collection tray (15), an upper packing (16) of the absorption section, and a second nozzle (110) arranged from bottom to top in the lower part of the absorption tower (12). The condensation and waste heat recovery unit includes a liquid collection plate (21), tail gas scrubbing section packing (22), No. 3 nozzle (23), demister (28) and tail gas outlet (24) arranged from bottom to top on the upper part of the absorption tower (12). The regeneration unit includes a regeneration tower (31), a regeneration gas cooler (32), a gas-liquid separator (33), and a regeneration gas-liquid pump (34). The outlet of the collection tray (15) is connected in sequence to the semi-rich liquid storage tank (17), the semi-rich liquid storage tank pump (18), the first channel of the condensing residual heat exchanger (19), and the first nozzle (14) through the pipeline. The outlet of the liquid collection pan (21) is connected to the condensate storage tank (26) and the condensate storage tank pump (27) in sequence through the pipeline and then splits into two paths. One path is connected to the liquid inlet of the regeneration tower (31) through the pipeline, and the other path is connected to the second channel of the condensate waste heat exchanger (19), the first channel of the cooler (25), and the third nozzle (23) in sequence through the pipeline. The gas outlet of the regeneration tower (31) is sequentially connected to the first channel of the regeneration gas cooler (32), the gas-liquid separator (33), the regeneration gas-liquid pump (34), and the liquid inlet of the regeneration tower (31) via pipelines.

2. The carbon capture system according to claim 1, characterized in that, The inlet of the second nozzle (110) is connected to the outlet of the regeneration tower (31).

3. The carbon capture system according to claim 1, characterized in that, The condenser heat exchanger (19) is a plate heat exchanger.

4. The carbon capture system according to claim 1, characterized in that, The condenser heat exchanger (19), cooler (25) and regenerated gas cooler (32) all adopt a counter-current heat exchange structure for hot and cold fluids.

5. The carbon capture system according to claim 1, characterized in that, The second channel of the cooler (25) and the second channel of the regenerated gas cooler (32) are both connected to the cooling water circulation pipeline.

6. The carbon capture system according to claim 1, characterized in that, The demister (28) is a wire mesh demister.

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