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CN-224207732-U - Low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration

CN224207732UCN 224207732 UCN224207732 UCN 224207732UCN-224207732-U

Abstract

A low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration belongs to the technical field of energy conservation and environmental protection. The utility model solves the problems that in the existing conventional decarbonization system, in order to ensure that the lean amine liquid has higher absorption capacity in the absorption tower, the lean amine liquid after heating and regeneration also needs to be cooled by a cooling tower before entering the absorption tower, thereby leading to higher energy consumption. The bottom amine liquid outlet of the regeneration tower is connected to the inlet of the flash evaporator, and the lean amine liquid outlet of the flash evaporator is connected to the lean amine liquid inlet of the absorption tower. The flash evaporation process is arranged between the regeneration tower and the absorption tower, and further a large amount of decarbonization is realized by using high vacuum by utilizing the solubility characteristic of carbon dioxide in the amine liquid, so that the temperature of the amine liquid can be further reduced in the vacuum decarbonization process, and the energy consumption is further effectively reduced.

Inventors

  • JIA QINGQUAN
  • QIN SHUANG
  • LI WEI
  • LI JINFENG
  • HUANG WEICHENG

Assignees

  • 哈尔滨工大金涛科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241231

Claims (10)

  1. 1. A low-energy consumption amine liquid decarburization system coupling heating regeneration and vacuum regeneration is characterized by comprising a regeneration tower (2) and a flash evaporator (4), wherein an amine liquid outlet (2-4) at the bottom of the regeneration tower (2) is connected to an amine liquid inlet of the flash evaporator (4), and an amine liquid outlet of the flash evaporator (4) is connected to a lean amine liquid inlet (1-2) of an absorption tower (1).
  2. 2. The low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration according to claim 1 is characterized in that a carbon dioxide outlet of the regeneration tower (2) is connected with a bleeding tower (6).
  3. 3. The low-energy consumption amine liquid decarburization system coupled with heating regeneration and vacuum regeneration according to claim 2, wherein a flash tank (5) is connected between a rich amine liquid outlet (1-1) of the absorption tower (1) and a first amine liquid inlet (2-1) of the regeneration tower (2).
  4. 4. A low-energy-consumption amine liquid decarbonization system coupled with heating regeneration and vacuum regeneration according to claim 3, wherein the gas outlet of the flash tank (5) is connected to the diffusing tower (6).
  5. 5. The low-energy consumption amine liquid decarburization system coupled with heating regeneration and vacuum regeneration according to claim 2, wherein a flash vapor outlet of the flash evaporator (4) is connected with a condenser (7), a gas outlet of the condenser (7) is connected with a vacuum pump (8), and an outlet of the vacuum pump (8) is connected with a diffusing tower (6).
  6. 6. The low-energy consumption amine liquid decarburization system coupled with heating regeneration and vacuum regeneration according to claim 5, wherein the condenser is a spray tower, a flash evaporation steam outlet of the flash evaporator (4) is communicated with a steam inlet of the spray tower, a cooling water inlet (7-1) and a cooling water outlet (7-2) are communicated with the spray tower, a sprayer in the spray tower is communicated with the cooling water inlet (7-1), and a steam outlet (7-3) is communicated with the top of the spray tower.
  7. 7. The low-energy consumption amine liquid decarburization system coupled with heating regeneration and vacuum regeneration according to claim 5, wherein the condenser (7) is a dividing wall type condenser, and a cooling tower (11) is connected to the heat absorption side of the condenser (7).
  8. 8. A low energy consumption amine liquid decarbonization system coupled with heating regeneration and vacuum regeneration according to claim 7, wherein the condensed water outlet of the condenser (7) is connected to the lean amine liquid inlet (1-2) of the absorption tower (1) through a condensed water pump (9).
  9. 9. The low-energy consumption amine liquid decarburization system coupled with heating regeneration and vacuum regeneration according to claim 1, wherein a lean liquid circulating pump set (10) is arranged between an amine liquid outlet of the flash evaporator (4) and a lean amine liquid inlet (1-2) of the absorption tower (1).
  10. 10. The low-energy consumption amine liquid decarburization system coupled with heating regeneration and vacuum regeneration according to claim 1, wherein a circulating pipeline is connected between the bottom of the regeneration tower (2) and the lower part of the regeneration tower (2), and a lean liquid filtering pump (12) and a filter (13) are arranged on the circulating pipeline.

Description

Low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration Technical Field The utility model relates to a low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration, belonging to the technical field of energy conservation and environmental protection. Background The traditional decarbonization system is heating regeneration, mainly uses amine liquid (MEDA) as an absorbent, and regenerates rich amine liquid by using steam as a heat source, so that the overall energy consumption is relatively high, and a large amount of high-quality steam is required to be used as a power source for regenerating rich amine liquid. However, the temperature level of the lean amine liquid is higher due to the heating regeneration, and the lean amine liquid needs to be cooled by means of a cooling tower and the like before entering the absorption tower, so that the lean amine liquid has higher absorption capacity in the absorption tower. The conventional technical route needs to consume a large amount of high-quality steam, and has relatively large energy consumption. Disclosure of utility model The utility model aims to solve the problem that in the conventional decarbonization system, in order to ensure that the lean amine liquid has higher absorption capacity in an absorption tower, the lean amine liquid after heating and regeneration also needs to be cooled by a cooling tower before entering the absorption tower, so that higher energy consumption is caused, and further provides a low-energy consumption amine liquid decarbonization system with coupling of heating and regeneration and vacuum regeneration. The technical scheme adopted by the utility model for solving the technical problems is as follows: A low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration comprises a regeneration tower and a flash evaporator, wherein an amine liquid outlet at the bottom of the regeneration tower is connected to an amine liquid inlet of the flash evaporator, and an amine liquid outlet of the flash evaporator is connected to a lean amine liquid inlet of an absorption tower. Further, a carbon dioxide outlet of the regeneration tower is connected with a diffusing tower. Further, a flash tank is connected between the rich amine liquid outlet of the absorption tower and the first amine liquid inlet of the regeneration tower. Further, the gas outlet of the flash tank is connected to a blow-down column. Further, a flash vapor outlet of the flash evaporator is connected with a condenser, a gas outlet of the condenser is connected with a vacuum pump, and an outlet of the vacuum pump is connected to the diffusing tower. Further, the condenser is a spray tower, a flash evaporation steam outlet of the flash evaporator is communicated with a steam inlet of the spray tower, a cooling water inlet and a cooling water outlet are communicated with each other on the spray tower, a sprayer in the spray tower is communicated with the cooling water inlet, and a steam outlet is communicated with the top of the spray tower. Further, the condenser is a dividing wall type condenser, and the heat absorption side of the condenser is connected with a cooling tower. Further, the condensed water outlet of the condenser is connected to the lean amine liquid inlet of the absorption tower through a condensed water pump. Further, a lean liquid circulating pump set is arranged between the amine liquid outlet of the flash evaporator and the lean amine liquid inlet of the absorption tower. Further, a circulating pipeline is connected between the bottom of the regeneration tower and the lower part of the regeneration tower, and a lean solution filtering pump and a filter are arranged on the circulating pipeline. Compared with the prior art, the utility model has the following effects: According to the low-energy consumption amine liquid decarburization system with coupling of heating regeneration and vacuum regeneration, a flash evaporation process is arranged between a regeneration tower and an absorption tower, after the rich amine liquid is regenerated through the regeneration tower, the solubility characteristic of carbon dioxide in the amine liquid is utilized, the environmental pressure of the amine liquid is rapidly reduced in a low-temperature and low-pressure working condition interval, the solubility of the carbon dioxide is rapidly reduced, at the moment, a great amount of further decarburization is realized by applying high vacuum, and the temperature of the amine liquid is further reduced in the vacuum decarburization process due to the principle of liquid evaporation and heat absorption, so that the energy consumption is effectively reduced. Drawings FIG. 1 is a schematic diagram of the structural composition of a low energy consumption amine liquid decarbonization system coupled