CN202393293U - Device for improving cooling effect of cooling tower by means of reducing air moisture - Google Patents

Abstract

The utility model relates to a device for improving the cooling effect of a cooling tower by means of reducing air moisture. The device is characterized by comprising a cooling water subsystem of a power plant, a CO2 trapping subsystem and a liquid desiccant subsystem, wherein the cooling water subsystem of the power plant and the CO2 trapping subsystem are integrated by the liquid desiccant subsystem, the cooling water subsystem of the power plant comprises the cooling tower (18), the CO2 trapping subsystem comprises an absorption tower (1), a rich liquor pump (2), a rich and barren liquor heat exchanger (3), a regenerating tower (4), a regenerative gas cooler (5), a gas-liquid separator (6), a barren liquor pump (7), a barren liquor heat exchanger (8), a reboiler (9), a barren liquor water-cooling heat exchanger (19) and a regenerative gas water-cooling cooler (20), and the liquid desiccant subsystem comprises a dehumidifier inlet fan (10). The vacuum degree of a condenser is improved, generating efficiency is increased, coal consumption is reduced, and the influence of a CO2 trapping system on power plant efficiency is decreased.

Description

A device for reducing the moisture content of the air to improve the cooling effect of the cooling tower

technical field

The utility model relates to a system for improving the cooling effect of a cooling tower by utilizing the energy of a CO ₂ capture device in a solution dehumidification recycling chemical method, and belongs to the field of energy recovery and energy saving of the CO ₂ capture technology.

Background technique

As the largest source of CO ₂ emissions from thermal power plants, controlling CO ₂ emissions from thermal power plants is an important part of global emission reduction efforts. Existing _CO2 capture devices have high energy consumption, resulting in high emission reduction costs, which is the main obstacle for the large-scale application of CCS (carbon dioxide capture and storage) technology so far.

Currently, the CO ₂ capture method is mainly the chemical absorption method. The CO ₂ is absorbed in the absorption tower through a chemical absorbent, and then the absorbed rich liquid is returned to the regeneration tower for heating and regeneration. The regeneration gas enters the compressor for compression and liquefaction after cooling down and condensing. It is transported to the burial ground for storage, and the regenerated lean liquid enters the absorption tower to continue absorbing CO ₂ after cooling down. In the regeneration tower, the solution needs to be heated above 110°C to desorb the CO ₂ gas. The regeneration process requires a lot of heat. Part of the input heat is used to heat the solution to the desorption temperature, another part is used to desorb _CO2 from the rich solution, and part is taken away by water evaporation and regeneration gas. In the process of lean liquid cooling and regeneration gas condensation, this part of the heat is taken away by the cooling water and is not utilized.

The cooling tower is the main equipment of the cold end system of the power plant, and its operation directly affects the heat economy of the unit and the power plant. Some literature shows that for medium-pressure units, the efficiency can be increased by 0.47% for every 1°C drop in cooling water temperature; for high-pressure units, it can be increased by 0.35%. In addition, due to the difference between the design condition of the cooling tower and the actual operating condition, under certain weather conditions in a year, the performance of the cooling tower may decline, making the power plant have to reduce the load.

The utility model uses the heat of lean liquid and regeneration gas to regenerate the dilute solution in the solution dehumidification system, and sends the dehumidified low-humidity air into the cooling tower of the power plant to improve the efficiency of the cooling tower and reduce the cooling water temperature at the entrance of the condenser , while improving the efficiency of the generating set of the power plant, the heat originally taken away by the cooling water is effectively utilized.

Contents of the invention

Technical problem: The purpose of this utility model is to provide a device for improving the cooling effect of the cooling tower. The system is based on solution dehumidification technology and chemical method _CO2 capture technology, recycles the heat of lean liquid and regeneration gas that originally needs to be taken away by cooling water in the process of _CO2 capture, and uses it for the regeneration of the solution dehumidification system, and will The low-humidity air treated by the solution dehumidification system is sent to the cooling tower of the power plant to improve the effect of the cooling tower, reduce the temperature of the cooling water inlet of the condenser, and improve the efficiency of the generator set.

Technical solution: In order to solve the above technical problems, the utility model provides a device for reducing the moisture content of the air to improve the cooling effect of the cooling tower, which includes the cooling water subsystem of the power plant, the _CO2 capture subsystem, and the cooling subsystem of the power plant Solution dehumidification subsystem integrated with _CO2 capture subsystem;

The cooling water subsystem of the power plant includes cooling towers;

The _CO2 capture subsystem includes absorption tower, rich liquid pump, lean liquid heat exchanger, regeneration tower, regeneration gas cooler, gas-liquid separator, lean liquid pump, lean liquid heat exchanger, reboiler, lean liquid Water-cooled heat exchanger, regeneration gas water-cooled cooler;

The solution dehumidification subsystem includes dehumidifier inlet fan, solution dehumidifier, dilute solution pump, water-cooled heat exchanger, concentrated solution pump, solution regenerator, regenerator inlet fan, concentrated solution dilute solution heat exchanger, air-water cooler;

In the solution dehumidification subsystem, the outlet of the dehumidifier inlet fan is connected to the blast inlet of the solution dehumidifier through an air pipe, the air outlet of the solution dehumidifier is connected to the air inlet of the air-water cooler, and the air-water cooler The air outlet is connected to the air inlet of the cooling tower; the inlet of the dilute solution pump is connected to the dilute solution outlet of the solution dehumidifier, and the outlet of the dilute solution pump is connected to the dilute solution inlet of the dilute solution heat exchanger for concentrated solution; The solution outlet is connected to the diluted solution inlet of the lean liquid heat exchanger; the diluted solution outlet of the lean liquid heat exchanger is connected to the diluted solution inlet of the regeneration gas cooler; the diluted solution outlet of the regeneration gas cooler is connected to the diluted solution inlet of the solution regenerator connected; the concentrated solution outlet of the solution regenerator is connected with the inlet of the concentrated solution pump; the outlet of the concentrated solution pump is connected with the concentrated solution inlet of the concentrated solution dilute solution heat exchanger; the concentrated solution outlet of the concentrated solution dilute solution heat exchanger is connected with the water cooling The concentrated solution inlet of the heat exchanger is connected; the concentrated solution outlet of the water-cooled heat exchanger is connected with the concentrated solution inlet of the solution dehumidifier; the outlet of the regenerator inlet fan is connected with the blast inlet of the solution regenerator;

In the _CO2 capture subsystem, flue gas enters the gas inlet of the absorption tower; the rich liquid outlet of the absorption tower is connected to the rich liquid pump; the rich liquid pump outlet is connected to the rich liquid inlet of the poor-rich liquid heat exchanger; The rich liquid outlet of the liquid heat exchanger is connected with the rich liquid inlet of the regeneration tower; the lean liquid outlet of the regeneration tower is connected with the lean liquid pump inlet; the lean liquid pump outlet is connected with the lean liquid inlet of the lean-rich liquid heat exchanger; the lean-rich liquid heat exchanger The lean liquid outlet of the lean liquid heat exchanger is connected to the lean liquid inlet of the lean liquid heat exchanger; the lean liquid outlet of the lean liquid heat exchanger is connected to the lean liquid inlet of the lean liquid water-cooled heat exchanger; the lean liquid outlet of the lean liquid water-cooled heat exchanger is connected to the The lean liquid inlet of the absorption tower is connected; the regeneration gas outlet of the regeneration tower is connected with the regeneration gas inlet of the regeneration gas cooler; the regeneration gas outlet of the regeneration gas cooler is connected with the regeneration gas inlet of the regeneration gas water-cooled cooler; The regeneration gas outlet communicates with the gas inlet of the gas-liquid separator;

In the cooling water subsystem of the power plant, the air outlet of the solution dehumidifier is connected to the air inlet of the air-water cooler, and the air outlet of the air-water cooler is connected to the air inlet of the cooling tower.

Beneficial effect:

(1) This utility model provides a method and device for recovering the energy of a chemical method _CO2 capture device by using solution dehumidification, recycling the heat of lean liquid and regeneration gas originally taken away by cooling water, and used for dilute solution dehumidification system Solution regeneration.

(2) Send the low-humidity air dehumidified by the solution dehumidification system into the cooling tower of the power plant to improve the efficiency of the cooling tower, reduce the inlet temperature of the condenser cooling water, and improve the efficiency of the generator set.

(3) The utility model makes full use of the heat that is directly taken away by the cooling water, improves the efficiency of the generating set, and reduces the adverse effect on the efficiency of the power plant after installing a CO ₂ capture system.

Description of drawings

Fig. 1 is a kind of device diagram that improves cooling tower cooling effect;

Among them: absorption tower 1; rich liquid pump 2; lean liquid heat exchanger 3; regeneration tower 4; regeneration gas cooler 5; gas-liquid separator 6; lean liquid pump 7; lean liquid heat exchanger 8; reboiler 9; dehumidifier inlet fan 10; solution dehumidifier 11; dilute solution pump 12; water-cooled heat exchanger 13; concentrated solution pump 14; solution regenerator 15; regenerator inlet fan 16; concentrated solution dilute solution heat exchanger 17; cooling Tower 18; lean liquid water-cooled heat exchanger 19; regeneration gas water-cooled cooler 20; air-water cooler 21; boiler 22, steam turbine 23; generator 24; condenser 25; water pump 26.

Detailed ways

The utility model will be described below with reference to the accompanying drawings.

The system of using solution dehumidification to recover energy from chemical _CO2 capture devices is based on solution dehumidification technology and chemical _CO2 capture technology. Commonly used solution dehumidifiers are lithium bromide solution, lithium chloride solution and calcium chloride solution etc. Commonly used solutions for capturing CO ₂ include MEA solution, MDEA solution, etc.

In the cooling water subsystem of the power plant, the air outlet of the solution dehumidifier is connected to the air inlet of the cooling tower after being cooled to room temperature through the air-water cooler, and the dehumidified air is sent into the cooling tower through the pipeline.

The invention provides a system for improving the cooling effect of a cooling tower, which includes a power plant cooling water subsystem, a _CO capture subsystem, and a solution dehumidification subsystem integrating the power plant cooling subsystem and the _CO capture subsystem;

The cooling water subsystem of the power plant includes cooling towers;

The _CO2 capture subsystem includes absorption tower, rich liquid pump, lean liquid heat exchanger, regeneration tower, regeneration gas cooler, gas-liquid separator, lean liquid pump, lean liquid heat exchanger, reboiler, lean liquid Water-cooled heat exchanger, regeneration gas water-cooled cooler;

The solution dehumidification subsystem includes dehumidifier inlet fan, solution dehumidifier, dilute solution pump, water-cooled heat exchanger, concentrated solution pump, solution regenerator, regenerator inlet fan, concentrated solution dilute solution heat exchanger, air-water cooler;

In the solution dehumidification subsystem, the outdoor air is sent into the solution dehumidifier 11 through the dehumidifier inlet fan 10 to contact with the concentrated solution for dehumidification, and the dehumidified dry air is first sent into the air-water cooler 21 to cool down to outdoor dryness The temperature of the bulb is then sent to the cooling tower 18 of the cooling water subsystem of the power plant to strengthen the heat and mass transfer in the cooling tower to improve the cooling effect of the cooling tower; The solution is sent by the dilute solution pump 12 to the concentrated solution dilute solution heat exchanger 17 to exchange heat with the concentrated solution obtained after regeneration, and the dilute solution after heat exchange is then sent to the lean solution heat exchanger 8 to be exchanged with the _CO2 trap The lean liquid in the system is heat-exchanged, and then sent to the regeneration cooler 5 in the _CO2 capture subsystem to exchange heat with the regenerated _CO2 gas at the outlet of the regeneration tower 4, so that the dilute solution is heated to the regeneration temperature, and then the dilute solution It is sent into the solution regenerator 15 to contact with the outdoor air to be regenerated; the regenerated air is introduced by the regenerator inlet fan 16; The heat exchange is then sent to the water-cooled heat exchanger 13, and then sent to the solution dehumidifier 11 after further cooling down to the inlet temperature of the solution dehumidifier;

In the _CO2 capture subsystem described above, the flue gas in the power plant boiler enters the absorption tower 1 after desulfurization and reacts with the lean liquid obtained after regeneration, and the purified gas after the _CO2 removal is discharged into the atmosphere, and the rich liquid obtained after the reaction is The liquid is sent to the lean-rich liquid heat exchanger 3 through the rich liquid pump 2 to exchange heat with the lean liquid, and then the rich liquid is sent to the regeneration tower 4 for regeneration. In the regeneration tower 4, the rich liquid is heated to the regeneration temperature by the reboiler 9, The _CO2 is desorbed, and the lean liquid obtained after regeneration is sent to the lean liquid heat exchanger 3 to exchange heat with the rich liquid through the lean liquid pump 7, and the lean liquid after exchanging heat is then sent to the lean liquid heat exchanger 8 Exchange heat with the dilute solution of the solution dehumidification subsystem, and then send it to the lean liquid water-cooled heat exchanger 19, and send the lean liquid to the absorption tower 1 after it drops to the absorption temperature; the CO ₂ desorbed in the regeneration tower 4 and The water vapor enters the regeneration gas cooler 5 together to further heat the dilute solution in the solution dehumidification subsystem, so that the dilute solution is regenerated, and the cooled _CO2 and condensed water are sent to the regeneration gas water cooler 20 for further cooling, so that The exported _CO2 is further compressed and liquefied, and the condensed water flows back from the gas-liquid separator 6 to the regeneration tower 4;

In the cooling water subsystem of the power plant, the dry air dehumidified by the solution dehumidification system is sent into the cooling tower 18, which strengthens the heat and mass transfer in the cooling tower, reduces the outlet water temperature of the cooling tower 18, and lowers the cooling water temperature. The temperature increases the vacuum of the condenser, which increases the efficiency of the unit.

Referring to Figure 1, the system for improving the cooling effect of a cooling tower includes a power plant cooling water subsystem, a _CO2 capture subsystem, and a solution dehumidification subsystem integrating the power plant cooling subsystem and the _CO2 capture subsystem;

The cooling water subsystem of the power plant includes a cooling tower 18;

_CO2 capture subsystem includes absorption tower 1, rich liquid pump 2, lean liquid heat exchanger 3, regeneration tower 4, regeneration gas cooler 5, gas-liquid separator 6, lean liquid pump 7, lean liquid heat exchanger 8. Reboiler 9, lean liquid water-cooled heat exchanger 19, regeneration gas water-cooled cooler 20;

The solution dehumidification subsystem includes dehumidifier inlet fan 10, solution dehumidifier 11, dilute solution pump 12, water-cooled heat exchanger 13, concentrated solution pump 14, solution regenerator 15, regenerator inlet fan 16, concentrated solution dilute solution heat exchanger 17. Air-water cooler 21;

In the solution dehumidification subsystem, the outlet of the dehumidifier inlet fan 10 is connected to the blast inlet of the solution dehumidifier 11 through an air duct, and the air outlet of the solution dehumidifier 11 is connected to the air inlet of the air-water cooler 21, and the air The air outlet of the water cooler 21 communicates with the air inlet of the cooling tower 18; the inlet of the dilute solution pump 12 is connected with the dilute solution outlet of the solution dehumidifier 11, and the outlet of the dilute solution pump 12 is connected with the dilute solution inlet of the concentrated solution dilute solution heat exchanger 17 The dilute solution outlet of the concentrated solution dilute solution heat exchanger 17 communicates with the dilute solution inlet of the lean liquid heat exchanger 8; the dilute solution outlet of the lean liquid heat exchanger 8 links to each other with the dilute solution inlet of the regeneration gas cooler 5; The dilute solution outlet of cooler 5 communicates with the dilute solution inlet of solution regenerator 15; The concentrated solution outlet of solution regenerator 15 links to each other with the inlet of concentrated solution pump 14; The concentrated solution inlet of the concentrated solution is connected; the concentrated solution outlet of the concentrated solution dilute solution heat exchanger 17 is connected with the concentrated solution inlet of the water-cooled heat exchanger 13; the concentrated solution outlet of the water-cooled heat exchanger 13 is connected with the concentrated solution inlet of the solution dehumidifier 11 ; The outlet of the regenerator inlet fan 16 is connected with the blast inlet of the solution regenerator 15;

In the _CO2 capture subsystem, the flue gas is connected to the gas inlet of the absorption tower 1; the rich liquid outlet of the absorption tower 1 is connected to the rich liquid pump 2; the rich liquid pump 2 outlet is connected to the rich liquid heat exchanger 3 The liquid inlet is connected; the rich liquid outlet of the lean-rich liquid heat exchanger 3 is connected with the rich liquid inlet of the regeneration tower 4; the lean liquid outlet of the regeneration tower 4 is connected with the lean liquid pump 7 inlet; the lean liquid pump 7 outlet is connected with the lean-rich liquid heat exchanger 3 The lean liquid inlet of the lean liquid heat exchanger 3 is connected with the lean liquid inlet of the lean liquid heat exchanger 8; the lean liquid outlet of the lean liquid heat exchanger 8 is connected with the lean liquid water cooling heat exchanger 19 The lean liquid inlet is connected; the lean liquid outlet of the lean liquid water-cooled heat exchanger 19 is connected with the lean liquid inlet of the absorption tower 1; the regeneration gas outlet of the regeneration tower 4 is connected with the regeneration gas inlet of the regeneration gas cooler 5; the regeneration gas cooler 5 The regeneration gas outlet communicates with the regeneration gas inlet of the regeneration gas water-cooled cooler 20; the regeneration gas outlet of the regeneration gas water-cooled cooler 20 communicates with the gas inlet of the gas-liquid separator 6;

In the power plant cooling water subsystem, the air outlet of the solution dehumidifier 11 is connected to the air inlet of the air-water cooler 21 , and the air outlet of the air-water cooler 21 is connected to the air inlet of the cooling tower 18 .

The utility model utilizes the dehumidified dilute solution of the solution dehumidification system to first exchange heat with the lean liquid with a lower temperature through a heat exchanger, and then exchange heat with the regeneration gas with a higher temperature, so that the dilute solution can be regenerated, and the solution dehumidification system is processed The final low-humidity air is sent to the cooling tower of the power plant to improve the cooling efficiency, reduce the cooling water temperature of the condenser, improve the efficiency of the generator set, and make use of the heat originally taken away by the cooling water, reducing energy loss.

A solution dehumidification subsystem is set up in a power plant with a CO ₂ capture device to integrate the cooling water subsystem of the power plant with the CO ₂ capture subsystem: the main feature is that the solution dehumidification subsystem puts air in the solution dehumidifier 11 After dehumidification in the middle, it is sent to the air inlet of the cooling tower 18 to strengthen the heat and mass transfer process in the cooling tower, improve the efficiency of the cooling tower, and reduce the temperature of the circulating water inlet of the condenser;

At the same time, the dilute solution at the outlet of the solution dehumidifier 11 first exchanges heat with the lean liquid with a lower temperature in the lean liquid heat exchanger 8, and then exchanges heat with the higher regenerated gas in the regenerated gas cooler 5, so that the dilute solution can be obtained. For regeneration, the regenerated dilute solution is used to reduce the moisture content of the inlet air of the cooling tower 18 .

The lean liquid water-cooled heat exchanger 19 is used to cool the lean liquid at the outlet of the lean liquid heat exchanger 8 to the absorption temperature, and the regeneration gas water-cooled cooler 20 is used to cool the regeneration gas at the outlet of the regeneration gas cooler 5 to the required temperature at the compressor inlet.

When it comes to recovering the lean liquid heat and regeneration gas heat of the _CO2 capture system of the power plant, this part of the recovered heat is used for the regeneration of the dilute solution of the solution dehumidification system, and the air dehumidified by the solution dehumidification system is sent to the cooling tower of the power plant to strengthen The heat and mass transfer effect system of the cooling tower, including the use of the improved solution dehumidification system or the improved CO ₂ capture system, as long as the principles are consistent, are all within the scope of the claims.

Referring to Fig. 1, in the solution dehumidification subsystem, the outlet of the fan 10 is connected with the blast inlet of the solution dehumidifier 11 through the air pipe, and the air outlet of the dehumidifier 11 is connected with the air inlet of the air-water cooler 21, and the air-water cooling The air outlet of device 21 communicates with the air inlet of power plant cooling tower 18; the inlet of dilute solution pump 12 is connected with the outlet of dilute solution of dehumidifier 11, and the outlet is connected with the inlet of dilute solution of concentrated solution dilute solution heat exchanger 17; The dilute solution outlet of the heat exchanger 17 is connected with the dilute solution inlet of the lean liquid heat exchanger 8; the dilute solution outlet of the lean liquid heat exchanger 8 is connected with the dilute solution inlet of the regeneration gas cooler 5; The outlet is communicated with the dilute solution inlet of the solution regenerator 15; the concentrated solution outlet of the solution regenerator 15 is connected with the inlet of the concentrated solution pump 14; the outlet of the concentrated solution pump 14 is connected with the concentrated solution inlet of the concentrated solution dilute solution heat exchanger 17 The concentrated solution outlet of concentrated solution dilute solution heat exchanger 17 links to each other with the concentrated solution inlet of water-cooled heat exchanger 13; The concentrated solution outlet of water-cooled heat exchanger 13 is connected with the concentrated solution inlet of solution dehumidifier 11; The outlet of blower fan 16 is connected with The blast inlet of the solution regenerator 15 is connected.

In the _CO2 capture subsystem, the flue gas is connected to the gas inlet of the absorption tower; the rich liquid outlet of the absorption tower 1 is connected to the rich liquid pump 2; the rich liquid pump 2 outlet is connected to the rich liquid inlet of the lean-rich liquid heat exchanger 3 The rich liquid outlet of the poor-rich liquid heat exchanger 3 is connected to the rich liquid inlet of the regeneration tower 4; the lean liquid outlet of the regeneration tower 4 is connected to the lean liquid pump 7 inlet; the lean liquid pump 7 outlet is connected to the lean liquid of the lean-rich liquid heat exchanger 3 The inlet is connected; the lean liquid outlet of the lean liquid heat exchanger 3 is connected with the lean liquid inlet of the lean liquid heat exchanger 8; the lean liquid outlet of the lean liquid heat exchanger 8 is connected with the lean liquid inlet of the lean liquid water-cooled heat exchanger 19 connected; the lean liquid outlet of the lean liquid water cooling heat exchange 19 is connected with the lean liquid inlet of the absorption tower 1; the regeneration gas outlet of the regeneration tower 4 is connected with the regeneration gas inlet of the regeneration gas cooler 5; the regeneration gas outlet of the regeneration gas cooler 5 is connected with the The regeneration gas inlet of the regeneration gas water-cooled cooler 20 communicates; the regeneration gas outlet of the regeneration gas water-cooled cooler 20 communicates with the gas inlet of the gas-liquid separator 6 .

In the cooling water subsystem of the power plant, the air outlet of the solution dehumidifier 11 is lowered to room temperature through the air-water cooler 21 and then connected to the air inlet of the cooling tower 18, and the dehumidified air is sent into the cooling tower 18 through the pipeline.

The above are only preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, but any equivalent modification or change made by those of ordinary skill in the art according to the content disclosed in the present utility model, All should be included in the scope of protection described in the claims.

Claims (1)

1. A device for reducing air moisture content to improve the cooling effect of cooling towers, characterized in that: it includes a power plant cooling water subsystem, a _CO capture subsystem, and integrates the power plant cooling subsystem with the _CO capture subsystem Together solution dehumidification subsystem; The cooling water subsystem of the power plant includes a cooling tower (18); The _CO2 capture subsystem includes absorption tower (1), rich liquid pump (2), lean-rich liquid heat exchanger (3), regeneration tower (4), regeneration gas cooler (5), gas-liquid separator (6 ), lean liquid pump (7), lean liquid heat exchanger (8), reboiler (9), lean liquid water-cooled heat exchanger (19) and regeneration gas water-cooled cooler (20); The solution dehumidification subsystem includes dehumidifier inlet fan (10), solution dehumidifier (11), dilute solution pump (12), water-cooled heat exchanger (13), concentrated solution pump (14), solution regenerator (15), regeneration Inlet fan (16), concentrated solution dilute solution heat exchanger (17) and air-water cooler (21); In the solution dehumidification subsystem, the outlet of the dehumidifier inlet fan (10) is connected to the blast inlet of the solution dehumidifier (11) through an air duct, and the air outlet of the solution dehumidifier (11) is connected to the air-water cooler (21 ), the air outlet of the air-water cooler (21) communicates with the air inlet of the cooling tower (18); the inlet of the dilute solution pump (12) connects with the dilute solution outlet of the solution dehumidifier (11), and the dilute solution pump (12) The outlet is connected to the dilute solution inlet of the concentrated solution dilute solution heat exchanger (17); the dilute solution outlet of the concentrated solution dilute solution heat exchanger (17) is connected to the dilute solution inlet of the lean solution heat exchanger (8); The dilute solution outlet of the lean liquid heat exchanger (8) is connected to the dilute solution inlet of the regenerated gas cooler (5); the dilute solution outlet of the regenerated gas cooler (5) is connected to the dilute solution inlet of the solution regenerator (15); The concentrated solution outlet of the solution regenerator (15) is connected with the inlet of the concentrated solution pump (14); the outlet of the concentrated solution pump (14) is connected with the concentrated solution inlet of the concentrated solution dilute solution heat exchanger (17); The concentrated solution outlet of the solution heat exchanger (17) is connected with the concentrated solution inlet of the water-cooled heat exchanger (13); the concentrated solution outlet of the water-cooled heat exchanger (13) is connected with the concentrated solution inlet of the solution dehumidifier (11); The outlet of the device inlet fan (16) is connected with the blast inlet of the solution regenerator (15); In the _CO2 capture subsystem, the flue gas enters the gas inlet of the absorption tower (1); the rich liquid outlet of the absorption tower (1) is connected to the rich liquid pump (2); the rich liquid pump (2) outlet is connected to the rich and poor The rich liquid inlet of the liquid heat exchanger (3) is connected; the rich liquid outlet of the lean liquid heat exchanger (3) is connected with the rich liquid inlet of the regeneration tower (4); the lean liquid outlet of the regeneration tower (4) is connected with the lean liquid pump (7 ) inlet; the outlet of the lean liquid pump (7) is connected to the lean liquid inlet of the lean liquid heat exchanger (3); the lean liquid outlet of the lean liquid heat exchanger (3) is connected to the lean liquid heat exchanger (8) The lean liquid inlets are connected; the lean liquid outlet of the lean liquid heat exchanger (8) is connected with the lean liquid inlet of the lean liquid water-cooled heat exchanger (19); the lean liquid outlet of the lean liquid water-cooled heat exchanger (19) is connected to the absorption tower The lean liquid inlet of (1) is connected; the regeneration gas outlet of the regeneration tower (4) is connected with the regeneration gas inlet of the regeneration gas cooler (5); the regeneration gas outlet of the regeneration gas cooler (5) is connected with the regeneration gas water cooler (20 ) is connected to the regeneration gas inlet; the regeneration gas outlet of the regeneration gas water-cooled cooler (20) is connected to the gas inlet of the gas-liquid separator (6); In the power plant cooling water subsystem, the air outlet of the solution dehumidifier (11) is connected to the air inlet of the air-water cooler (21), and the air outlet of the air-water cooler (21) is connected to the air inlet of the cooling tower (18).

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