Carbon dioxide spraying and absorbing device for combustion gas

Abstract

The utility model relates to the technical field of combustion gas treatment, and discloses a carbon dioxide spraying absorption device for combustion gas, which comprises a filler spraying absorption tower, the left side of the filler spraying absorption tower is fixedly connected with a combustion gas inlet pipe, and the upper end of the filler spraying absorption tower is fixedly connected with a gas outlet pipe. According to the carbon dioxide spraying and absorbing device for the combustion gas, a solution rich in carbon dioxide is subjected to flash evaporation and purification, carbon dioxide gas is separated out, and the carbon dioxide gas is discharged after being compressed by the intercooling low-pressure multi-stage compressor and the intercooling medium-pressure multi-stage compressor, so that capture and purification of carbon dioxide are realized; after the DEBA solvent is separated from the carbon dioxide gas in the high-pressure flash tower, the medium-pressure flash tower and the low-pressure flash tower, part of the solvent is supplemented through a solvent supplementing and adding pipe, and the DEBA solvent is fed into the high-pressure flash tower, the medium-pressure flash tower and the low-pressure flash tower; after being cooled by a solvent circulating pipe I and a solvent circulating cooler, the solvent is returned to a liquid distributor at the top of the filler spraying absorption tower through a solvent distribution pipe for cyclic utilization.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion gas treatment, in particular to a carbon dioxide spray absorption device for combustion gas. Background Art

[0002] At present, many enterprises burn natural gas for heating during the production process or to achieve some other technological requirements. After the natural gas burns, a large amount of CO 2 and high-temperature waste gas are produced. Most of these enterprises directly discharge these CO 2 and high-temperature waste gas into the air without treatment or utilization. In this way, it is a waste for enterprises and also causes environmental pollution.

[0003] Integrated gasification combined cycle (IGCC) technology, as an efficient clean energy production technology, can not only effectively utilize fossil energy but also reduce the negative impact on the environment. The diethyl sebacate solvent method, as an advanced carbon dioxide capture technology, has been widely studied and applied in various industrial processes. Through this method, carbon dioxide can be effectively captured from IGCC fuel gas and safely stored or used for other purposes, thus significantly reducing its negative impact on climate change. Therefore, we propose a carbon dioxide spray absorption device for combustion gas to recycle the solvent and improve the resource utilization efficiency. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a carbon dioxide spray absorption device for combustion gas, which can effectively solve the problems in the prior art.

[0005] The technical solution adopted by the utility model is as follows: a carbon dioxide spray absorption device for combustion gas, including a packed spray absorption tower. A combustion gas inlet pipe is fixedly connected to the left side of the packed spray absorption tower. An air outlet pipe is fixedly connected to the upper end of the packed spray absorption tower. The air outlet pipe is fixedly connected to the input end of a gas expander. The output end of the gas expander is fixedly connected to a clean combustion gas outlet pipe. A liquid outlet pipe is fixedly connected to the lower end of the packed spray absorption tower. The right end of the liquid outlet pipe is fixedly connected to a high-pressure flash evaporation tower. A gas circulation pipe 1 is fixedly connected to the upper end of the high-pressure flash evaporation tower. The gas circulation pipe 1 is fixedly connected to the input end of a gas circulation compressor. The output end of the gas circulation compressor is fixedly connected to a gas circulation pipe 2. The gas circulation pipe 2 is fixedly connected to the heat medium inlet of a gas circulation cooler. The heat medium outlet of the gas circulation cooler is fixedly connected to a gas circulation pipe 3. A condensate outlet water pipe 1 is fixedly connected to the lower end of the high-pressure flash evaporation tower. The right end of the condensate outlet water pipe 1 is fixedly connected to a medium-pressure flash evaporation tower. A condensate outlet water pipe 2 is fixedly connected to the lower end of the medium-pressure flash evaporation tower. The right end of the condensate outlet water pipe 2 is fixedly connected to a low-pressure flash evaporation tower. A solvent circulation pipe 1 is fixedly connected to the lower end of the low-pressure flash evaporation tower. The solvent circulation pipe 1 is fixedly connected to the input end of a solvent circulation pump. The output end of the solvent circulation pump is fixedly connected to a solvent circulation pipe 2. The solvent circulation pipe 2 is fixedly connected to the heat medium inlet of a solvent circulation cooler. The heat medium outlet of the solvent circulation cooler is fixedly connected to a solvent distribution pipe. A connecting pipe 1 is fixedly connected to the upper end of the low-pressure flash evaporation tower. The right end of the connecting pipe 1 is fixedly connected to a low-pressure multi-stage compressor with intermediate cooling. The right side of the low-pressure multi-stage compressor with intermediate cooling is fixedly connected to a connecting pipe 2. The right side of the connecting pipe 2 is fixedly connected to a medium-pressure multi-stage compressor with intermediate cooling. A rich carbon dioxide pipe is fixedly connected to the upper end of the medium-pressure flash evaporation tower. A solvent supplement and addition pipe is fixedly connected to the outside of the solvent circulation pipe 1.

[0006] Preferably, the gas circulation pipe 3 is communicated with the combustion gas inlet pipe.

[0007] Through the above technical solution, the gas circulation pipe 3 is provided. The combustion gas and carbon dioxide gas existing in the high-pressure flash evaporation tower return to the packed spray absorption tower after passing through the gas circulation compressor and the gas circulation cooler. The carbon dioxide gas is absorbed by the diethyl sebacate (hereinafter referred to as DEBA) solvent to form a carbon dioxide-rich solution. The combustion gas is discharged through the air outlet pipe and the gas expander and then through the clean combustion gas outlet pipe. Most of the carbon dioxide in the gas is removed, and high-quality clean combustion gas is produced.

[0008] Preferably, the solvent distribution pipe is communicated with the liquid distributor of the packed spray absorption tower.

[0009] Through the above technical solution, a solvent distribution pipe is provided. After the DEBA solvent is cooled by the solvent circulation pipe 1 and the solvent circulation cooler, it returns to the liquid distributor at the top of the packed spray absorption tower through the solvent distribution pipe, ensuring that the solvent is evenly distributed on the packing and recycled.

[0010] Preferably, the carbon dioxide-rich pipe is interconnected with the connecting pipe 2.

[0011] Through the above technical solution, the carbon dioxide-rich gas is discharged through the carbon dioxide-rich pipe and a multi-stage compressor with intercooling and medium pressure, realizing the capture and purification of carbon dioxide, and ensuring that the final carbon dioxide product meets the predetermined purity and quality requirements.

[0012] Preferably, the solvent supplementary addition pipe adds diethyl sebacate solvent.

[0013] Through the above technical solution, the DEBA solvent is provided, and carbon dioxide is absorbed by the DEBA solvent from the combustion gas to form a carbon dioxide-rich solution, facilitating the absorption of carbon dioxide.

[0014] Preferably, the packed spray absorption tower is arranged to the left of the high-pressure flash tower.

[0015] Through the above technical solution, the carbon dioxide-rich solution formed by the packed spray absorption tower can be injected into the high-pressure flash tower for flash treatment.

[0016] Preferably, the high-pressure flash tower, medium-pressure flash tower, and low-pressure flash tower are arranged in sequence from left to right.

[0017] Through the above technical solution, a high-pressure flash tower, a medium-pressure flash tower, and a low-pressure flash tower are provided. These towers are used for flash treatment of the carbon dioxide-rich solution to separate carbon dioxide and the DEBA solvent, and the DEBA solvent can be recycled.

[0018] Compared with the prior art, the present utility model provides a carbon dioxide spray absorption device for combustion gas, having the following beneficial effects:

[0019] 1. The carbon dioxide spray absorption device for combustion gas: The combustion gas enters the packed spray absorption tower through the combustion gas inlet pipe. In the tower, the DEBA solvent is sprayed. The solvent contacts the carbon dioxide in the combustion gas, and the carbon dioxide is absorbed by the DEBA from the combustion gas, forming a solution rich in carbon dioxide. The liquid outlet pipe injects the solution rich in carbon dioxide into the high-pressure flash distillation tower, medium-pressure flash distillation tower, and low-pressure flash distillation tower. After flash distillation treatment, carbon dioxide and DEBA solvent are separated. The combustion gas and carbon dioxide gas return to the packed spray absorption tower after passing through the gas circulation compressor and gas circulation cooler. The carbon dioxide gas is absorbed by the DEBA solvent to form a solution rich in carbon dioxide. The combustion gas passes through the outlet pipe and gas expander and is discharged through the clean combustion gas outlet pipe. Most of the carbon dioxide in the gas is removed, producing high-quality clean combustion gas. The solution rich in carbon dioxide passes through the medium-pressure flash distillation tower and low-pressure flash distillation tower, and the flash-purified carbon dioxide gas is compressed and discharged through the intercooled low-pressure multistage compressor and intercooled medium-pressure multistage compressor, realizing the capture and purification of carbon dioxide, ensuring that the final carbon dioxide product meets the predetermined purity and quality requirements. After the DEBA solvent is separated from the carbon dioxide gas in the high-pressure flash distillation tower, medium-pressure flash distillation tower, and low-pressure flash distillation tower, part of the solvent is supplemented through the solvent supplement addition pipe, cooled by the solvent circulation pipe 1 and solvent circulation cooler, and then returns to the liquid distributor at the top of the packed spray absorption tower through the solvent distribution pipe, ensuring that the solvent is evenly distributed on the packing for recycling.

[0020] 2. The carbon dioxide spray absorption device for combustion gas helps to reduce greenhouse gas emissions by capturing and treating carbon dioxide in the combustion gas, meeting the requirements of environmental protection and climate protection; the solvent circulation and energy recovery design in the device improve the resource utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic three-dimensional structure of the present utility model Figure 1 ;

[0022] Figure 2 Schematic three-dimensional structure of the present utility model Figure 2 ;

[0023] Figure 3 Schematic three-dimensional structure of the present utility model Figure 3 ;

[0024] Figure 4 Schematic three-dimensional structure of the present utility model Figure 4 ;

[0025] Figure 5 Schematic three-dimensional structure of the present utility model Figure 5 。

[0026] Wherein: 1. Packed spray absorption tower; 2. Combustion gas inlet pipe; 3. Outlet gas pipe; 4. Gas expander; 5. Clean combustion gas outlet pipe; 6. Liquid outlet pipe; 7. High-pressure flash evaporation tower; 8. Gas circulation pipe 1; 9. Gas circulation compressor; 10. Gas circulation pipe 2; 11. Gas circulation cooler; 12. Gas circulation pipe 3; 13. Condensate outlet water pipe 1; 14. Medium-pressure flash evaporation tower; 15. Condensate outlet water pipe 2; 16. Low-pressure flash evaporation tower; 17. Solvent circulation pipe 1; 18. Solvent circulation pump; 19. Solvent circulation pipe 2; 20. Solvent circulation cooler; 21. Solvent distribution pipe; 22. Connection pipe 1; 23. Intercooled low-pressure multistage compressor; 24. Connection pipe 2; 25. Intercooled medium-pressure multistage compressor; 26. Rich carbon dioxide pipe; 27. Solvent supplement and addition pipe. Detailed implementation mode

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment 1: As Figures 1-5As shown in the figure, the carbon dioxide spray absorption device for combustion gas provided by the utility model includes a packed spray absorption tower 1. A combustion gas inlet pipe 2 is fixedly connected to the left side of the packed spray absorption tower 1. An air outlet pipe 3 is fixedly connected to the upper end of the packed spray absorption tower 1. The air outlet pipe 3 is fixedly connected to the input end of a gas expander 4. The output end of the gas expander 4 is fixedly connected to a clean combustion gas outlet pipe 5. A liquid outlet pipe 6 is fixedly connected to the lower end of the packed spray absorption tower 1. The right end of the liquid outlet pipe 6 is fixedly connected to a high-pressure flash evaporation tower 7. A gas circulation pipe 8 is fixedly connected to the upper end of the high-pressure flash evaporation tower 7. The gas circulation pipe 8 is fixedly connected to the input end of a gas circulation compressor 9. The output end of the gas circulation compressor 9 is fixedly connected to a gas circulation pipe 10. The gas circulation pipe 10 is fixedly connected to the heat medium inlet of a gas circulation cooler 11. The heat medium outlet of the gas circulation cooler 11 is fixedly connected to a gas circulation pipe 12. A condensate outlet water pipe 13 is fixedly connected to the lower end of the high-pressure flash evaporation tower 7. The right end of the condensate outlet water pipe 13 is fixedly connected to a medium-pressure flash evaporation tower 14. A condensate outlet water pipe 15 is fixedly connected to the lower end of the medium-pressure flash evaporation tower 14. The right end of the condensate outlet water pipe 15 is fixedly connected to a low-pressure flash evaporation tower 16. A solvent circulation pipe 17 is fixedly connected to the lower end of the low-pressure flash evaporation tower 16. The solvent circulation pipe 17 is fixedly connected to the input end of a solvent circulation pump 18. The output end of the solvent circulation pump 18 is fixedly connected to a solvent circulation pipe 19. The solvent circulation pipe 19 is fixedly connected to the heat medium inlet of a solvent circulation cooler 20. The heat medium outlet of the solvent circulation cooler 20 is fixedly connected to a solvent distribution pipe 21. A connecting pipe 22 is fixedly connected to the upper end of the low-pressure flash evaporation tower 16. The right end of the connecting pipe 22 is fixedly connected to an intercooled low-pressure multistage compressor 23. The right side of the intercooled low-pressure multistage compressor 23 is fixedly connected to a connecting pipe 24. The right side of the connecting pipe 24 is fixedly connected to an intercooled medium-pressure multistage compressor 25. A rich carbon dioxide pipe 26 is fixedly connected to the upper end of the medium-pressure flash evaporation tower 14. A solvent supplementary addition pipe 27 is fixedly connected to the outer side of the solvent circulation pipe 17.

[0029] Specifically, the gas circulation pipe 12 is communicated with the combustion gas inlet pipe 2. The advantage is that the gas circulation pipe 12 is provided, and the combustion gas and carbon dioxide gas existing in the high-pressure flash evaporation tower 7 return to the packed spray absorption tower 1 after passing through the gas circulation compressor 9 and the gas circulation cooler 11. The carbon dioxide gas is absorbed by the diethyl sebacate (hereinafter simply referred to as DEBA) solvent to form a carbon dioxide-rich solution. The combustion gas is discharged through the air outlet pipe 3 and the gas expander 4 and then through the clean combustion gas outlet pipe 5. Most of the carbon dioxide in the gas is removed, and high-quality clean combustion gas is produced.

[0030] Specifically, the solvent distribution pipe 21 is interconnected with the liquid distributor of the packed spray absorption tower 1. The advantage is that the solvent distribution pipe 21 is provided. After the DEBA solvent is cooled by the solvent circulation pipe 17 and the solvent circulation cooler 20, it returns to the liquid distributor at the top of the packed spray absorption tower 1 through the solvent distribution pipe 21, ensuring that the solvent is evenly distributed on the packing and recycled.

[0031] Specifically, the rich carbon dioxide pipe 26 is interconnected with the connecting pipe 24. The advantage is that after the rich carbon dioxide gas passes through the rich carbon dioxide pipe 26, it is discharged by the intercooled medium-pressure multi-stage compressor 25, realizing the capture and purification of carbon dioxide and ensuring that the final carbon dioxide product meets the predetermined purity and quality requirements.

[0032] Example 2: As Figures 2-5 shown, as an improvement over the previous example.

[0033] Specifically, the solvent supplementary addition pipe 27 adds diethyl sebacate solvent. The advantage is that the DEBA solvent is provided, and carbon dioxide is absorbed by the DEBA solvent from the combustion gas to form a carbon dioxide-rich solution, facilitating the absorption of carbon dioxide.

[0034] Specifically, the packed spray absorption tower 1 is arranged to the left of the high-pressure flash tower 7. The advantage is that the carbon dioxide-rich solution formed by the packed spray absorption tower 1 can be injected into the high-pressure flash tower 7 for flash treatment.

[0035] Specifically, the high-pressure flash tower 7, the medium-pressure flash tower 14, and the low-pressure flash tower 16 are arranged in sequence from left to right. The advantage is that the high-pressure flash tower 7, the medium-pressure flash tower 14, and the low-pressure flash tower 16 are provided. These towers are used for flash treatment of the carbon dioxide-rich solution, thereby separating carbon dioxide and the DEBA solvent, and the DEBA solvent can be recycled.

[0036] Working principle: During use, the combustion gas enters the packed spray absorption tower 1 through the combustion gas inlet pipe 2. In the tower, the DEBA solvent is sprayed. The solvent contacts the carbon dioxide in the combustion gas, and the carbon dioxide is absorbed by the DEBA from the combustion gas, forming a solution rich in carbon dioxide. The liquid outlet pipe 6 injects the solution rich in carbon dioxide into the high-pressure flash tower 7, the medium-pressure flash tower 14, and the low-pressure flash tower 16. After flash treatment, carbon dioxide and the DEBA solvent are separated. The combustion gas and the carbon dioxide gas return to the packed spray absorption tower 1 after passing through the gas circulation compressor 9 and the gas circulation cooler 11. The carbon dioxide gas is absorbed by the DEBA solvent to form a solution rich in carbon dioxide, and the combustion gas is discharged through the outlet pipe 3 and the gas expander 4 and then through the clean combustion gas outlet pipe 5. Most of the carbon dioxide in the gas is removed, producing high-quality clean combustion gas; the carbon dioxide gas purified by flash evaporation from the solution rich in carbon dioxide after passing through the medium-pressure flash tower 14 and the low-pressure flash tower 16 is compressed and discharged after passing through the intercooled low-pressure multistage compressor 23 and the intercooled medium-pressure multistage compressor 24, realizing the capture and purification of carbon dioxide and ensuring that the final carbon dioxide product meets the predetermined purity and quality requirements. After the DEBA solvent is separated from the carbon dioxide gas in the high-pressure flash tower 7, the medium-pressure flash tower 14, and the low-pressure flash tower 16, after replenishing part of the solvent through the solvent replenishment addition pipe 27, it is cooled by the solvent circulation pipe 17 and the solvent circulation cooler 20 and then returns to the liquid distributor at the top of the packed spray absorption tower 1 through the solvent distribution pipe 21 to ensure that the solvent is evenly distributed on the packing for recycling.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combustion gas carbon dioxide spray absorption device, comprising a packed spray absorption tower (1), characterized in that: The left side of the packing spray absorption tower (1) is fixedly connected to a combustion gas inlet pipe (2); the upper end of the packing spray absorption tower (1) is fixedly connected to an outlet pipe (3); the outlet pipe (3) is fixedly connected to the input end of a gas expander (4); the output end of the gas expander (4) is fixedly connected to a clean combustion gas outlet pipe (5); the lower end of the packing spray absorption tower (1) is fixedly connected to a liquid outlet pipe (6); the right end of the liquid outlet pipe (6) is fixedly connected to a high-pressure flash tower (7); the upper end of the high-pressure flash tower (7) is fixedly connected to a gas circulation pipe 1 (8); the gas The circulation pipe 1 (8) is fixedly connected to the input end of the gas circulation compressor (9), the output end of the gas circulation compressor (9) is fixedly connected to the gas circulation pipe 2 (10), the gas circulation pipe 2 (10) is fixedly connected to the heat medium inlet of the gas circulation cooler (11), the heat medium outlet of the gas circulation cooler (11) is fixedly connected to the gas circulation pipe 3 (12), the lower end of the high-pressure flash tower (7) is fixedly connected to the condensation water outlet pipe 1 (13), the right end of the condensation water outlet pipe 1 (13) is fixedly connected to the medium-pressure flash tower (14), the lower end of the medium-pressure flash tower (14) is fixedly connected to the heat medium inlet of the gas circulation cooler (11), the heat medium outlet of the gas circulation cooler (11) is fixedly connected to the gas circulation pipe 3 (12), the lower end of the high-pressure flash tower (7) is fixedly connected to the condensation water outlet pipe 1 (13), the right end of the condensation water outlet pipe 1 (13) is fixedly connected to the medium-pressure flash tower (14), and the medium-pressure flash tower (14) is fixedly connected to the heat medium inlet of the gas circulation cooler (11). The end of the condenser water outlet pipe (15) is fixedly connected to a condenser water outlet pipe (15), the right end of the condenser water outlet pipe (15) is fixedly connected to a low-pressure flash tower (16), the lower end of the low-pressure flash tower (16) is fixedly connected to a solvent circulation pipe (17), the solvent circulation pipe (17) is fixedly connected to the input end of a solvent circulation pump (18), the output end of the solvent circulation pump (18) is fixedly connected to a solvent circulation pipe (19), the solvent circulation pipe (19) is fixedly connected to the heat medium inlet of a solvent circulation cooler (20), and the heat medium outlet of the solvent circulation cooler (20) is fixedly connected to a solvent circulation pipe (19). The solvent distribution pipe (21) is fixedly connected to the upper end of the low-pressure flash tower (16), the right end of the connecting pipe (22) is fixedly connected to a low-pressure multi-stage compressor (23) with intermediate cooling, the right side of the low-pressure multi-stage compressor (23) with intermediate cooling is fixedly connected to a connecting pipe (24), the right side of the connecting pipe (24) is fixedly connected to a medium-pressure multi-stage compressor (25) with intermediate cooling, the upper end of the medium-pressure flash tower (14) is fixedly connected to a carbon dioxide-rich pipe (26), and the outer side of the solvent circulation pipe (17) is fixedly connected to a solvent supplement pipe (27).

2. The carbon dioxide spray absorption device for combustion gas according to claim 1, characterized in that: The gas circulation pipe three (12) is connected to the combustion gas inlet pipe (2).

3. The carbon dioxide spray absorption device for combustion gas according to claim 2, characterized in that: The solvent distribution pipe (21) is in communication with the liquid distributor of the packing spray absorption tower (1).

4. The carbon dioxide spray absorption device for combustion gas according to claim 3 is characterized in that: The carbon dioxide-rich pipe (26) is in communication with the second connecting pipe (24).

5. The carbon dioxide spray absorption device for combustion gas according to claim 1, characterized in that: The solvent supplement tube (27) adds diethyl sebacate solvent.

6. The carbon dioxide spray absorption device for combustion gas according to claim 1, characterized in that: The packed spray absorption tower (1) is arranged on the left side of the high-pressure flash tower (7).

7. The carbon dioxide spray absorption device for combustion gas according to claim 1, characterized in that: The high-pressure flash tower (7), the medium-pressure flash tower (14) and the low-pressure flash tower (16) are arranged in sequence from left to right.

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