Carbon dioxide capture waste heat recovery system based on absorption heat pump

Abstract

The utility model belongs to the technical field of heat exchange equipment, and particularly relates to a carbon dioxide capture waste heat recovery system based on an absorption heat pump, which comprises an absorption tower, a regeneration tower, a reboiler, a heat exchanger, a cooler and the absorption heat pump, and the absorption heat pump consists of an evaporator, an absorber, a regenerator, a condenser, a flash tank, a steam control valve and a water replenishing control valve. According to the absorption heat pump, high-temperature regenerated gas generated by the regeneration tower is used as a driving heat source of the evaporator and the regenerator, higher-grade hot water is prepared in the absorber, high-temperature steam and high-pressure steam are prepared in the flash tank and conveyed to the reboiler, heat of the regenerated gas is effectively recycled, industrial waste heat is recycled, and the energy consumption is reduced. The steam consumption is reduced, the energy consumption of the carbon capture system is effectively reduced, and the efficiency of the carbon capture system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange equipment, and in particular relates to a carbon dioxide capture waste heat recovery system based on an absorption heat pump. Background Art

[0002] The emission standards of atmospheric pollutants are becoming increasingly stringent, and end-of-pipe treatment has begun to shift towards source reduction and process control. Energy conservation and emission reduction is a basic national policy of my country and an extremely urgent task facing my country in achieving a major strategic guarantee for sustainable development. my country's industrial energy consumption accounts for more than 70% of the total energy consumption, of which at least 50% is converted into industrial waste heat with different carriers and temperatures, most of which can be recycled. However, at present, the recovery rate and energy utilization efficiency of low-temperature industrial waste heat resources in my country are relatively low. For example, enterprises using coal-fired boilers such as power plants and heating heat source plants produce a large amount of carbon dioxide. It is necessary to study the application of carbon dioxide capture technology in these fields, and consider how to combine existing processes to reduce enterprise operating costs and do a good job in energy conservation and emission reduction. Research on carbon capture technology can effectively reduce carbon emissions from fossil fuel units and reduce environmental pollution caused by industries such as electricity. However, the heat generated in the existing carbon dioxide capture technology is not recycled, resulting in a waste of resources. How to achieve efficient utilization of waste heat resources in the carbon dioxide capture system has become a technical problem that needs to be solved urgently by technicians in this field. Utility Model Content

[0003] To solve the above problems, the utility model provides a carbon dioxide capture waste heat recovery system based on an absorption heat pump, comprising an absorption tower, a regeneration tower, a reboiler, a heat exchanger, a cooler, and an absorption heat pump. The absorption heat pump is composed of an evaporator, an absorber, a regenerator, a condenser, a flash tank, a steam control valve, and a water supply control valve. The absorption heat pump utilizes the high-temperature regeneration gas generated by the regeneration tower as a driving heat source for the evaporator and the regenerator, produces higher-quality hot water in the absorber, produces high-temperature steam in the flash tank, and the high-pressure steam is transported to the reboiler. The heat of the regeneration gas is effectively recycled, thereby realizing the recovery of industrial waste heat, reducing the consumption of steam, effectively reducing the energy consumption of the carbon capture system, and improving the efficiency of the carbon capture system.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is: a carbon dioxide capture waste heat recovery system based on an absorption heat pump, comprising an absorption tower, a regeneration tower, a reboiler, a heat exchanger, a cooler, and an absorption heat pump, wherein the absorption heat pump comprises an evaporator, an absorber, a regenerator, and a condenser, a cooling water pipeline A and a cooling water pipeline B are arranged on the condenser, the heat exchanger and the absorber are connected through a carbon dioxide rich liquid pipeline C, and the absorber and the regeneration tower are connected through a carbon dioxide rich liquid pipeline D; the lower part of the absorption tower is connected to a flue gas inlet, and the upper part is connected to a flue gas outlet, and the absorption tower and the heat exchanger are connected through a carbon dioxide rich liquid pipeline A, The heat exchanger and the regeneration tower are connected through the carbon dioxide rich liquid pipeline B and the carbon dioxide lean liquid pipeline A, the heat exchanger and the cooler are connected through the carbon dioxide lean liquid pipeline B, the cooler and the absorption tower are connected through the carbon dioxide lean liquid pipeline C, the cooler is provided with cooling water pipeline C and cooling water pipeline D, the regeneration tower and the reboiler are connected through the reboiled liquid pipeline A and the reboiled liquid pipeline B, a steam inlet pipeline is provided above the reboiler, a steam condensate pipeline is provided below the reboiler, and the steam pipeline is connected to the steam inlet pipeline; the regeneration gas pipeline A is connected above the regeneration tower, the regeneration gas pipeline B and the regeneration gas pipeline C are provided in parallel on the regeneration gas pipeline A, the evaporator is connected to the regeneration gas pipeline B and the regeneration gas pipeline D, the regenerator is connected to the regeneration gas pipeline C and the regeneration gas pipeline E, and the regeneration gas pipeline F is connected to the regeneration gas pipeline D and the regeneration gas pipeline E converging pipeline end.

[0005] The absorption heat pump also includes a flash tank, a steam control valve, and a water replenishment control valve. The absorber and the flash tank are connected by a hot water pipeline A and a hot water pipeline B, the water replenishment pipeline is connected to the hot water pipeline B, a water replenishment control valve is arranged on the water replenishment pipeline, a steam pipeline is connected above the flash tank, and a steam control valve is arranged on the steam pipeline.

[0006] The beneficial effects of the utility model are as follows: the absorption heat pump utilizes the high-temperature regeneration gas generated by the regeneration tower as the driving heat source of the evaporator and the regenerator, produces higher-quality hot water in the absorber, produces high-temperature steam in the flash tank, and the high-pressure steam is transported to the reboiler. The heat of the regeneration gas is effectively recycled and utilized, realizing the recovery of industrial waste heat, reducing the consumption of steam, effectively reducing the energy consumption of the carbon capture system, and improving the efficiency of the carbon capture system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a structural schematic diagram of a carbon dioxide capture waste heat recovery system based on an absorption heat pump according to a first specific implementation mode of the utility model;

[0008] Figure 2 It is a structural schematic diagram of a carbon dioxide capture waste heat recovery system based on an absorption heat pump according to a second specific implementation mode of the utility model;

[0009] In the figure: 1-absorption tower, 2-regeneration tower, 3-reboiler, 4-heat exchanger, 5-cooler, 6-absorption heat pump, 7-evaporator, 8-absorber, 9-regenerator, 10-condenser, 11-flash tank, 12-steam control valve, 13-water supply control valve, 14-flue gas inlet, 15-flue gas outlet, 16-carbon dioxide rich liquid pipeline A, 17-carbon dioxide rich liquid pipeline B, 18-carbon dioxide lean liquid pipeline A, 19-carbon dioxide lean liquid pipeline B, 20-carbon dioxide lean liquid pipeline C, 21-reboiling liquid pipeline A, 22-reboiling liquid pipeline B, 23-regeneration gas pipeline A, 24-regeneration gas pipeline B, 25-regeneration gas pipeline C, 26-regeneration gas pipeline D, 27-Regeneration gas pipeline E, 28-Regeneration gas pipeline F, 29-Hot water pipeline A, 30-Hot water pipeline B, 31-Water supply pipeline, 32-Steam pipeline, 33-Steam inlet pipeline, 34-Steam condensate pipeline, 35-Cooling water pipeline A, 36-Cooling water pipeline B, 37-Cooling water pipeline C, 38-Cooling water pipeline D, 39-Carbon dioxide rich liquid pipeline C, 40-Carbon dioxide rich liquid pipeline D. DETAILED DESCRIPTION

[0010] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments: Example 1

[0011] like Figure 1As shown, the carbon dioxide capture waste heat recovery system based on the absorption heat pump of the first specific embodiment of the utility model comprises an absorption tower 1, a regeneration tower 2, a reboiler 3, a heat exchanger 4, a cooler 5, and an absorption heat pump 6, wherein the absorption heat pump 6 is composed of an evaporator 7, an absorber 8, a regenerator 9, a condenser 10, a flash tank 11, a steam control valve 12, and a water supply control valve 13. A cooling water pipeline A 35 and a cooling water pipeline B 36 are arranged on the condenser 10. The absorber 8 and the flash tank 11 are connected by a hot water pipeline A 29 and a hot water pipeline B 30. The hot water circulation between the absorber 8 and the flash tank 11 flows by gravity and density difference, and no power device such as a circulating pump is required. The water supply pipeline 31 and the hot water pipeline B 30 are connected by a hot water pipeline A 29 and a hot water pipeline B 30. The absorber 1 is connected to the heat exchanger 4 through the carbon dioxide rich liquid pipeline A 16, the heat exchanger 4 and the regeneration tower 2 are connected through the carbon dioxide rich liquid pipeline B 17 and the carbon dioxide lean liquid pipeline A 18, the heat exchanger 4 and the cooler 5 are connected through the carbon dioxide lean liquid pipeline B 19, the cooler 5 and the absorber 1 are connected through the carbon dioxide lean liquid pipeline C 20, the cooler 5 is provided with a cooling water pipeline C 37 and a cooling water pipeline D 38, the regeneration tower 2 and the reboiler 3 are connected through the reboiler liquid pipeline A 21 and the reboiler liquid pipeline B 22. 22 is connected, a steam inlet pipeline 33 is arranged above the reboiler 3, and a steam condensate pipeline 34 is arranged below the reboiler 3, and the steam pipeline 32 is connected to the steam inlet pipeline 33; a regeneration gas pipeline A 23 is connected above the regeneration tower 2, and a regeneration gas pipeline B 24 and a regeneration gas pipeline C 25 are arranged in parallel on the regeneration gas pipeline A 23, the evaporator 7 is connected to the regeneration gas pipeline B 24 and the regeneration gas pipeline D 26, the regenerator 9 is connected to the regeneration gas pipeline C 25 and the regeneration gas pipeline E 27, and the end of the regeneration gas pipeline D 26 and the regeneration gas pipeline E 27 is connected to the regeneration gas pipeline F 28.The flue gas enters the absorption tower 1 through the flue gas inlet 14. The lean liquid captures the carbon dioxide in the flue gas in the absorption tower 1 and is converted into a rich liquid. The rich liquid is heated by the heat exchanger 4 and enters the regeneration tower 2. The rich liquid in the regeneration tower 2 is heated by the steam in the reboiler 3 and is converted into a lean liquid and a high-temperature regeneration gas. The lean liquid enters the heat exchanger 4 and the cooler 5 in sequence and is cooled twice before re-entering the absorption tower 1. The high-temperature regeneration gas enters the evaporator 7 and the regenerator 9 respectively through the regeneration gas pipeline A 23, and is used as a driving heat source for the absorption heat pump 6 for heat exchange. The high-temperature regeneration gas is cooled and discharged through the regeneration gas pipeline F 28. The hot water stored in the flash tank 11 enters the absorber 8 through the hot water pipeline B 30. The hot water is heated and then passes through the hot water pipeline A 29 enters the flash tank 11 to flash out high-pressure steam. When the pressure of the flash tank 11 is higher than the set value, the steam control valve 12 is opened, and the high-pressure steam is transported to the reboiler 3 through the steam pipeline 32. At the same time, the water supply control valve 13 performs start-stop control and opening adjustment according to the height of the liquid level in the flash tank 11 to ensure that the liquid level in the flash tank 11 remains stable. The absorption heat pump 6 uses the high-temperature regeneration gas generated by the regeneration tower 2 as the driving heat source of the evaporator 7 and the regenerator 9, and produces hot water with higher taste in the absorber 8. High-temperature steam is produced in the flash tank 11. The heat of the regeneration gas is effectively recycled, realizing the recovery of industrial waste heat and reducing the consumption of steam. Example 2

[0012] like Figure 2 As shown, the carbon dioxide capture waste heat recovery system based on the absorption heat pump according to the second specific embodiment of the utility model is different from that of Example 1 in that: the absorption heat pump 6 is composed of an evaporator 7, an absorber 8, a regenerator 9, and a condenser 10, and the absorption heat pump 6 is not provided with a flash tank 11, a steam control valve 12, and a water supply control valve 13; the heat exchanger 4 and the absorber 8 are connected by a carbon dioxide rich liquid pipeline C 39, and the absorber 8 and the regeneration tower 2 are connected by a carbon dioxide rich liquid pipeline D 40. The flue gas enters the absorption tower 1 through the flue gas inlet 14. The lean liquid captures the carbon dioxide in the flue gas in the absorption tower 1 and is converted into a rich liquid. The rich liquid enters the heat exchanger 4 and the absorber 8 in sequence and enters the regeneration tower 2 after being heated twice. The rich liquid in the regeneration tower 2 is heated again by the steam in the reboiler 3 and is converted into a lean liquid and a high-temperature regeneration gas. The lean liquid enters the heat exchanger 4 and the cooler 5 in sequence and is cooled twice and then re-enters the absorption tower 1. The high-temperature regeneration gas enters the evaporator 7 and the regenerator 9 respectively through the regeneration gas pipeline A 23, and is used as a driving heat source for the absorption heat pump 6 for heat exchange. The high-temperature regeneration gas is discharged through the regeneration gas pipeline F 28 after cooling. The absorption heat pump 6 uses the high-temperature regeneration gas generated by the regeneration tower 2 as the driving heat source for the evaporator 7 and the regenerator 9 to heat the rich liquid in the absorber 8. The heat of the regeneration gas is effectively recovered and utilized, thereby realizing the recovery of industrial waste heat and reducing the consumption of steam.

[0013] The present utility model is not limited to the above-mentioned implementation modes, and anyone should be aware that any technical solution identical or similar to the present utility model made under the inspiration of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A carbon dioxide capture waste heat recovery system based on an absorption heat pump, characterized in that: The invention comprises an absorption tower (1), a regeneration tower (2), a reboiler (3), a heat exchanger (4), a cooler (5), and an absorption heat pump (6), wherein the absorption heat pump (6) comprises an evaporator (7), an absorber (8), a regenerator (9), and a condenser (10). A cooling water pipeline A (35) and a cooling water pipeline B (36) are arranged on the condenser (10). The heat exchanger (4) and the absorber (8) are connected via a carbon dioxide rich liquid pipeline C (39), and the absorber (8) and the regeneration tower (2) are connected via a carbon dioxide rich liquid pipeline D (40). The absorption tower (1) is connected to a flue gas inlet (14) at the bottom and a flue gas outlet (15) at the top. The absorption tower (1) and the heat exchanger (4) are connected via a carbon dioxide rich liquid pipeline A (16), and the heat exchanger (4) and the regeneration tower (2) are connected via a carbon dioxide rich liquid pipeline B ( 17) is connected to the carbon dioxide lean liquid pipeline A (18), the heat exchanger (4) and the cooler (5) are connected via the carbon dioxide lean liquid pipeline B (19), the cooler (5) and the absorption tower (1) are connected via the carbon dioxide lean liquid pipeline C (20), a cooling water pipeline C (37) and a cooling water pipeline D (38) are arranged on the cooler (5), the regeneration tower (2) and the reboiler (3) are connected via the reboiled liquid pipeline A (21) and the reboiled liquid pipeline B (22), a steam inlet pipeline (33) is arranged above the reboiler (3), and a steam condensate pipeline (34) is arranged below the reboiler (3), and the steam pipeline (32) is connected to the steam inlet pipeline (33); the regeneration tower (2) is connected to the regeneration gas pipeline A (23), and the regeneration gas pipeline B (24) and the regeneration gas pipeline C (25) are arranged in parallel on the regeneration gas pipeline A (23), The evaporator (7) is connected to the regeneration gas pipeline B (24) and the regeneration gas pipeline D (26), the regenerator (9) is connected to the regeneration gas pipeline C (25) and the regeneration gas pipeline E (27), and the end of the confluence pipeline of the regeneration gas pipeline D (26) and the regeneration gas pipeline E (27) is connected to the regeneration gas pipeline F (28).

2. The carbon dioxide capture waste heat recovery system based on absorption heat pump according to claim 1, characterized in that: The absorption heat pump (6) further comprises a flash tank (11), a steam control valve (12), and a water replenishment control valve (13); the absorber (8) and the flash tank (11) are connected via a hot water pipeline A (29) and a hot water pipeline B (30); the water replenishment pipeline (31) and the hot water pipeline B (30) are connected; the water replenishment control valve (13) is arranged on the water replenishment pipeline (31); the top of the flash tank (11) is connected to a steam pipeline (32); and the steam control valve (12) is arranged on the steam pipeline (32).

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