Flue gas carbon emission comprehensive treatment device
By using flue gas heat exchanger to recover heat in the flue gas carbon emission comprehensive treatment device, the problems of low CO2 capture efficiency and high energy consumption in high-temperature flue gas are solved, and efficient CO2 recovery and energy conservation are achieved.
Patent Information
- Application Number
- CN202422986589.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-12-05
AI Technical Summary
When handling high-temperature flue gas, CO2 capture efficiency is low and energy consumption is high. Especially after the MEA process directly enters the CO2 absorption system, it leads to energy waste and high costs.
A comprehensive flue gas carbon emission treatment device was designed, and heat was recovered through the boiler flue gas heat exchanger for the regeneration of CO2 absorbing liquid. After the flue gas heat was reduced, it entered the CO2 absorption tank, and combined with multiple air pipes and air outlets were designed. , increase the contact time between the gas and the absorbent liquid, realize the effective recovery of CO2 and the recycling of the absorbent liquid.
It effectively reduces the heat of flue gas, improves the CO2 capture efficiency, and saves energy through the heating process of the recycled liquid, achieving efficient CO2 recovery and energy utilization.
Smart Images
Figure CN222352359U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air pollution control, and in particular to a comprehensive treatment device for flue gas carbon emissions. Background Art
[0002] Boiler exhaust gas, as a combustion product, contains a large amount of smoke and carbon dioxide (CO 2 ), CO 2 CO is a greenhouse gas that traps heat in the Earth's atmosphere and causes the Earth's temperature to rise, leading to melting glaciers, rising sea levels and more extreme weather events. 2 Emissions can also affect marine ecosystems, leading to ocean acidification and threatening the survival and reproduction of marine life. High concentrations of CO 2 It can also have negative impacts on human health, such as increased respiratory diseases and decreased immunity. 2 Emissions are an important measure to combat climate change and global warming. 2 It is a carbon resource. High concentrations of CO 2 It can be used in many fields such as medical, food, welding, etc. 2 The recovery process is MEA process and pressure swing adsorption process. However, for high-temperature flue gas, such as dry desulfurization, denitrification and dust removal, the flue gas directly enters the MEA carbon dioxide absorption system or the pressure swing adsorption system, which is not conducive to CO 2 Capturing, while wasting a lot of energy.
[0003] The MEA process is a chemical absorption process that uses CO 2 It reacts chemically with the absorbent to form a weakly linked intermediate compound, and then changes the conditions to make the CO rich 2 CO in the absorption liquid 2 The typical chemical absorbent is monoethanolamine (MEA). However, this method is relatively expensive. For example, the solvent needs to be heated during regeneration, which consumes a lot of energy. Therefore, a method is needed to reasonably utilize heat and comprehensively treat and recover CO. 2 device. Utility Model Content
[0004] The technical problem to be solved by the utility model is to propose a comprehensive flue gas carbon emission treatment device to convert CO 2 Recycling and utilizing flue gas heat for CO 2 The absorption liquid is regenerated to make CO 2 The absorption liquid is recycled, saving energy.
[0005] The utility model discloses a comprehensive treatment device for flue gas carbon emission, comprising a boiler, a smoke exhaust port is arranged on the top of the boiler, the smoke exhaust port is connected to the heat medium inlet of the flue gas heat exchanger through a smoke exhaust pipe, and the heat medium outlet on the top of the flue gas heat exchanger is connected to the CO 2 Absorption tank, CO 2 A main gas pipe is vertically arranged inside the absorption tank. The lower end of the main gas pipe is connected to the exhaust pipe. The upper end of the main gas pipe is connected to an L-shaped gas branch pipe. The gas branch pipe includes a vertical branch pipe and a horizontal branch pipe. The upper and lower ends of the vertical branch pipe are connected to the main gas pipe and the horizontal branch pipe respectively. The horizontal branch pipe is located at the CO 2 At the bottom of the absorption tank, there are several gas outlet holes on the wall of the horizontal branch pipe. 2 The bottom of the absorption tank is connected to the refrigerant inlet of the flue gas heat exchanger through a rich liquid pipe. The refrigerant inlet and refrigerant outlet of the flue gas heat exchanger are connected through a heat exchange elbow arranged in the flue gas heat exchanger. The refrigerant outlet of the flue gas heat exchanger is connected to the refrigerant inlet of the secondary heat exchanger. The refrigerant outlet of the secondary heat exchanger is connected to the liquid inlet at the top of the regeneration liquid tank. An electric heating pipe is arranged inside the regeneration liquid tank. The top of the regeneration liquid tank is connected to the CO 2 The gas storage tank and the liquid outlet at the bottom of the regeneration liquid tank are connected to the heat medium inlet of the secondary heat exchanger through the lean liquid pipe 1, and the heat medium outlet of the secondary heat exchanger is connected to the CO 2 Liquid inlet at the top of the absorption tank.
[0006] Preferably, the end of the horizontal branch pipe that is not connected to the vertical branch pipe is a blind end.
[0007] Preferably, the air outlet is arranged at the bottom end of the horizontal branch pipe. 2 Discharge from the bottom of the horizontal pipe to increase the gas and CO 2 The contact time of the absorption liquid is conducive to full absorption.
[0008] Preferably, CO 2 A main air outlet pipe is provided on the top of the absorption tank.
[0009] Preferably, a lean liquid pump is provided on the lean liquid pipe 1, and a condenser is provided on the lean liquid pipe 2.
[0010] Preferably, a rich liquid pump is provided on the rich liquid pipe.
[0011] Preferably, a plurality of air branch pipes are provided, and the plurality of air branch pipes are symmetrically distributed around the main air pipe.
[0012] Preferably, CO 2 There is a sewage pipe at the bottom of the absorption tank, and a sewage valve is installed on the sewage pipe. 2 After being absorbed, dust and other impurities also remain in the CO 2 In the absorption liquid, it accumulates in CO after precipitation. 2 The bottom of the absorption tank can be discharged through the sewage pipe.
[0013] Preferably, the flue gas heat exchanger includes a heat exchange shell, the heat medium inlet and the heat medium outlet of the flue gas heat exchanger are respectively connected to the inner cavity of the heat exchange shell, an S-shaped heat exchange elbow and a cleaning brush corresponding to the heat exchange elbow are provided in the heat exchange shell, the cleaning brush is arranged horizontally, both ends of the cleaning brush are slidably connected to the inner wall of the heat exchange shell, and a vertically arranged connecting rod is fixed on the cleaning brush; an exhaust pipe is provided on the top of the heat exchange shell, the exhaust pipe is connected to the inner cavity of the heat exchange shell, the exhaust pipe includes a top plate and a side wall, an exhaust piston is provided in the exhaust pipe, the exhaust piston is adapted to the side wall of the exhaust pipe, the piston rod of the exhaust piston is slidably connected to the top plate of the exhaust pipe, a spring is provided on the top of the exhaust piston, both ends of the spring are respectively fixedly connected to the exhaust piston and the top plate of the exhaust pipe, an exhaust port is provided on the upper part of the side wall of the exhaust pipe, an exhaust pipe is provided on the exhaust port, and the bottom of the exhaust piston is fixedly connected to the top of the connecting rod; the bottom surface of the heat exchange shell is an inclined surface, and an ash discharge pipe is provided at the lowest point of the inclined surface.
[0014] Preferably, a slide groove is provided on the inner wall of the heat exchange shell, and both ends of the cleaning brush are slidably connected to the inner wall of the heat exchange shell through the slide groove, thereby ensuring that the cleaning brush moves in one plane.
[0015] Preferably, an ash discharge valve is provided on the ash discharge pipe.
[0016] Valves can be installed on the pipeline according to control needs, and the flow of materials in the corresponding pipeline can be conveniently controlled and adjusted by opening and closing the valves.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] The flue gas heat is recovered for preheating of the rich liquid, and the flue gas heat is reduced, making it suitable for entering the CO 2 absorption liquid, and is more conducive to CO 2 After the rich liquid is regenerated into lean liquid, the high-temperature lean liquid can further heat the rich liquid after heat exchange with the flue gas. In this process, the heat is reused, and CO 2 It is recycled and saves energy. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a schematic diagram of the structure of the utility model flue gas carbon emission comprehensive treatment device;
[0020] Figure 2 This is a schematic diagram of the internal structure of the flue gas heat exchanger;
[0021] Figure 3 It is a schematic diagram of the structure of the main air pipe and the branch air pipe;
[0022] In the figure: 1. Boiler; 2. Smoke exhaust pipe; 3. Smoke heat exchanger; 4. Exhaust pipe; 5. CO 2Absorption tank; 6. Main gas pipe; 7. Vertical branch pipe; 8. Horizontal branch pipe; 9. Air outlet; 10. Rich liquid pipe; 11. Heat exchange elbow; 12. Secondary heat exchanger; 13. Regeneration liquid tank; 14. Electric heating pipe; 15. Lean liquid pipe 1; 16. Lean liquid pipe 2; 17. Main gas outlet pipe; 18. Condenser; 19. Lean liquid pump; 20. Rich liquid pump; 21. Gas branch pipe; 22. Heat exchange shell; 23. Cleaning brush; 24. Connecting rod; 25. Exhaust pipe; 26. Exhaust piston; 27. Spring; 28. Ash discharge pipe; 29. CO 2 Gas storage tank; 30. Ash discharge valve. DETAILED DESCRIPTION
[0023] The present invention will be described clearly and completely below with reference to the accompanying drawings.
[0024] Example 1
[0025] like Figure 1 As shown, the comprehensive treatment device for flue gas carbon emission of the utility model comprises a boiler 1, a smoke exhaust port is arranged on the top of the boiler 1, the smoke exhaust port is connected to the heat medium inlet of the flue gas heat exchanger 3 through the smoke exhaust pipe 2, and the heat medium outlet at the top of the flue gas heat exchanger 3 is connected to the CO 2 Absorption tank 5, CO 2 The top of the absorption tank 5 is provided with a main gas outlet pipe 17, CO 2 A main gas pipe 6 is vertically arranged inside the absorption tank 5. The lower end of the main gas pipe 6 is connected to the exhaust pipe 4. The upper end of the main gas pipe 6 is connected to an L-shaped gas branch pipe 21. The gas branch pipe 21 includes a vertical branch pipe 7 and a horizontal branch pipe 8. The upper and lower ends of the vertical branch pipe 7 are connected to the main gas pipe 6 and the horizontal branch pipe 8 respectively. The horizontal branch pipe 8 is located at the CO 2 At the lower part of the absorption tank 5, the end of the horizontal branch pipe 8 that is not connected to the vertical branch pipe 7 is a blind end. A plurality of air outlet holes 9 are provided on the wall of the horizontal branch pipe 8. The air outlet holes 9 are provided at the bottom of the horizontal branch pipe 8. CO 2 The bottom of the absorption tank 5 is connected to the refrigerant inlet of the flue gas heat exchanger 3 through the rich liquid pipe 10, the refrigerant inlet and the refrigerant outlet of the flue gas heat exchanger 3 are connected through the heat exchange elbow 11 arranged in the flue gas heat exchanger 3, the refrigerant outlet of the flue gas heat exchanger 3 is connected to the refrigerant inlet of the secondary heat exchanger 12, and the refrigerant outlet of the secondary heat exchanger 12 is connected to the liquid inlet at the top of the regeneration liquid tank 13. The regeneration liquid tank 13 is provided with an electric heating pipe 14. The top of the regeneration liquid tank 13 is connected to the CO2 through the exhaust pipe 4. 2 The gas storage tank 29, the liquid outlet at the bottom of the regeneration liquid tank 13 is connected to the heat medium inlet of the secondary heat exchanger 12 through the lean liquid pipe 15, and the heat medium outlet of the secondary heat exchanger 12 is connected to the CO 2 Liquid inlet at the top of absorption tank 5.
[0026] A lean liquid pump 19 is provided on the lean liquid pipe 15 , and a condenser 18 is provided on the lean liquid pipe 2 16 .
[0027] A rich liquid pump 20 is provided on the rich liquid pipe 10 .
[0028] like Figure 3 As shown, a plurality of air branch pipes 21 are provided, and the plurality of air branch pipes 21 are symmetrically distributed around the main air pipe 6 .
[0029] The working process is as follows:
[0030] The flue gas from boiler 1 enters the flue gas heat exchanger 3 through the exhaust pipe 2. The heat in the flue gas is absorbed and then enters the CO 2 The gas enters the absorption tank 5 and enters the vertical branch pipe 7 through the main gas pipe 6 and is then discharged from the outlet 9 of the horizontal branch pipe 8. 2 The CO contained in the absorption tank 5 2 Absorbent liquid contacts CO in flue gas 2 is absorbed, and the remaining gas is from CO 2 The main outlet pipe 17 at the top of the absorption tank discharges CO 2 Absorbent absorbs CO 2 The rich liquid then enters the refrigerant inlet of the flue gas heat exchanger 3 through the rich liquid pipe 10, absorbs the heat of the flue gas in the heat exchange elbow 11, and enters the refrigerant inlet of the secondary heat exchanger 12 from the refrigerant outlet of the flue gas heat exchanger 3. After absorbing the heat in the secondary heat exchanger 12, it enters the regeneration liquid tank 13, and is heated by the electric heating tube 14. 2 CO in the absorption liquid 2 Escape, CO 2 The absorption liquid is regenerated into lean liquid, and the clean CO 2 From the regeneration tank into the CO 2 Gas storage tank 29; high temperature lean liquid is not suitable for direct absorption of CO 2 The lean liquid obtained in the regeneration liquid tank 13 enters the heat medium inlet of the secondary heat exchanger 12 through the lean liquid pipe 15 as a heat medium. After the lean liquid exchanges heat in the secondary heat exchanger 12, it enters the condenser 18 through the heat medium outlet of the secondary heat exchanger 12 for further condensation to obtain a low-temperature lean liquid, and then enters the CO 2 through the lean liquid pipe 16. 2 Absorption tank 5 is used to continue absorbing CO 2 .
[0031] Example 2
[0032] On the basis of Example 1, Figure 2As shown, the flue gas heat exchanger 3 includes a heat exchange shell 22, the heat medium inlet and the heat medium outlet of the flue gas heat exchanger 3 are respectively connected to the inner cavity of the heat exchange shell 22, and the heat exchange shell 22 is provided with an S-shaped heat exchange elbow 11 and a cleaning brush 23 corresponding to the heat exchange elbow 11. The cleaning brush 23 is arranged horizontally, and both ends of the cleaning brush 23 are slidably connected to the inner wall of the heat exchange shell 22. A vertically arranged connecting rod 24 is fixed to the cleaning brush 23; an exhaust pipe 25 is arranged on the top of the heat exchange shell 22, and the exhaust pipe 25 is connected to the inner cavity of the heat exchange shell 22. The exhaust pipe 25 includes a top plate and a side wall. An exhaust piston 26 is provided in 25, and the exhaust piston 26 is adapted to the side wall of the exhaust cylinder 25. The piston rod of the exhaust piston 26 is slidably connected to the top plate of the exhaust cylinder 25. A spring 27 is provided on the top of the exhaust piston 26, and the two ends of the spring 27 are respectively fixedly connected to the exhaust piston 26 and the top plate of the exhaust cylinder 25. An exhaust port is provided on the upper part of the side wall of the exhaust cylinder 25, and an exhaust pipe 4 is provided on the exhaust port. The bottom of the exhaust piston 26 is fixedly connected to the top of the connecting rod 24; the bottom surface of the heat exchange shell 22 is an inclined surface, and an ash discharge pipe 28 is provided at the lowest point of the inclined surface, and an ash discharge valve 30 is provided on the ash discharge pipe 28.
[0033] The inner wall of the heat exchange shell 22 is provided with a slide groove, and the two ends of the cleaning brush 23 are slidably connected to the inner wall of the heat exchange shell 22 through the slide groove.
[0034] A balancing air pipe may be provided on the top plate of the exhaust pipe 25 so that the air pressure in the space where the spring 27 is located in the exhaust pipe 25 remains constant. When the flue gas enters the inner cavity of the heat exchange shell 22 through the heat medium inlet of the flue gas heat exchanger 3, the exhaust piston 26 is located at the lower part of the exhaust port under the elastic force of the spring 27. The flue gas cannot be discharged from the exhaust port, but first fills the inner cavity of the heat exchange shell 22. As the flue gas increases, the air pressure in the inner cavity of the heat exchange shell 22 increases. When the air pressure is greater than the elastic force of the spring 27, the gas pushes the exhaust piston 26 upward until the exhaust piston 26 moves to above the exhaust port, and the flue gas is discharged. It is discharged from the exhaust pipe 4. When the pressure in the heat exchange shell 22 drops, the exhaust piston 26 moves to the lower part of the exhaust port under the action of the spring 27. The flue gas needs to continue to accumulate. This arrangement is beneficial to increasing the contact time between the flue gas and the heat exchange elbow 11, making the heat exchange more sufficient. When the exhaust piston 26 moves up and down, the driving connecting rod 24 drives the cleaning brush 23 to move up and down, which is beneficial to brush off the dust remaining on the outside of the heat exchange elbow 11 when the flue gas passes through and gather it on the bottom surface of the heat exchange shell 22. The inclined surface is set to make the dust gather at the ash discharge pipe 28, which is convenient for opening the ash discharge valve 30 for discharge.
Claims
1. A flue gas carbon emission comprehensive treatment device, comprising a boiler (1), wherein a smoke exhaust port is provided at the top of the boiler (1), characterized in that: The smoke exhaust port is connected to the heat medium inlet of the smoke heat exchanger (3) through a smoke exhaust pipe (2), and the heat medium outlet at the top of the smoke heat exchanger (3) is connected to the CO2 absorption tank (5) through an exhaust pipe (4). A main gas pipe (6) is vertically arranged inside the CO2 absorption tank (5), and the lower end of the main gas pipe (6) is connected to the exhaust pipe (4). The upper end of the main gas pipe (6) is connected to an L-shaped gas branch pipe (21). The gas branch pipe (21) includes a vertical branch pipe (7) and a horizontal branch pipe (8). The upper and lower ends of the vertical branch pipe (7) are respectively connected to the main gas pipe (6) and the horizontal branch pipe (8). The horizontal branch pipe (8) is located at the lower part of the CO2 absorption tank (5). A plurality of gas outlet holes (9) are arranged on the wall of the horizontal branch pipe (8). The bottom of the CO2 absorption tank (5) is connected to the smoke heat exchanger through a rich liquid pipe (10). (3) a refrigerant inlet, the refrigerant inlet and the refrigerant outlet of the flue gas heat exchanger (3) are connected via a heat exchange elbow (11) provided in the flue gas heat exchanger (3), the refrigerant outlet of the flue gas heat exchanger (3) is connected to the refrigerant inlet of the secondary heat exchanger (12), the refrigerant outlet of the secondary heat exchanger (12) is connected to the liquid inlet at the top of the regeneration liquid tank (13), an electric heating pipe (14) is provided inside the regeneration liquid tank (13), the top of the regeneration liquid tank (13) is connected to the CO2 gas storage tank (29) via an exhaust pipe (4), the liquid outlet at the bottom of the regeneration liquid tank (13) is connected to the heat medium inlet of the secondary heat exchanger (12) via a lean liquid pipe 1 (15), and the heat medium outlet of the secondary heat exchanger (12) is connected to the liquid inlet at the top of the CO2 absorption tank (5) via a lean liquid pipe 2 (16).
2. The flue gas carbon emission comprehensive treatment device according to claim 1 is characterized in that: The end of the horizontal branch pipe (8) not connected to the vertical branch pipe (7) is a blind end.
3. The comprehensive flue gas carbon emission treatment device according to claim 1 is characterized in that: The air outlet (9) is arranged at the bottom end of the horizontal branch pipe (8).
4. The flue gas carbon emission comprehensive treatment device according to claim 1 is characterized in that: A main gas outlet pipe (17) is provided at the top of the CO2 absorption tank (5).
5. The flue gas carbon emission comprehensive treatment device according to claim 1 is characterized in that: A lean liquid pump (19) is provided on the lean liquid pipe 1 (15), and a condenser (18) is provided on the lean liquid pipe 2 (16).
6. The flue gas carbon emission comprehensive treatment device according to claim 1 is characterized in that: A rich liquid pump (20) is provided on the rich liquid pipe (10).
7. The flue gas carbon emission comprehensive treatment device according to claim 1 is characterized in that: A plurality of gas distribution pipes (21) are provided, and the plurality of gas distribution pipes (21) are symmetrically distributed around the main gas pipe (6).
8. The flue gas carbon emission comprehensive treatment device according to claim 1 is characterized in that: The flue gas heat exchanger (3) comprises a heat exchange shell (22); a heat medium inlet and a heat medium outlet of the flue gas heat exchanger (3) are respectively connected to the inner cavity of the heat exchange shell (22); an S-shaped heat exchange elbow (11) and a cleaning brush (23) arranged corresponding to the heat exchange elbow (11) are arranged in the heat exchange shell (22); the cleaning brush (23) is arranged horizontally; both ends of the cleaning brush (23) are slidably connected to the inner wall of the heat exchange shell (22); a vertically arranged connecting rod (24) is fixed to the cleaning brush (23); an exhaust pipe (25) is arranged at the top of the heat exchange shell (22); the exhaust pipe (25) is connected to the inner cavity of the heat exchange shell (22), and the exhaust pipe (25) comprises a top plate and side walls, an exhaust piston (26) is provided in the exhaust cylinder (25), the exhaust piston (26) is matched with the side wall of the exhaust cylinder (25), a piston rod of the exhaust piston (26) is slidably connected to the top plate of the exhaust cylinder (25), a spring (27) is provided at the top of the exhaust piston (26), two ends of the spring (27) are respectively fixedly connected to the exhaust piston (26) and the top plate of the exhaust cylinder (25), an exhaust port is provided at the upper part of the side wall of the exhaust cylinder (25), an exhaust pipe (4) is provided at the exhaust port, and the bottom of the exhaust piston (26) is fixedly connected to the top of the connecting rod (24); the bottom surface of the heat exchange shell (22) is an inclined surface, and an ash discharge pipe (28) is provided at the lowest part of the inclined surface.
9. The flue gas carbon emission comprehensive treatment device according to claim 8, characterized in that: The inner wall of the heat exchange shell (22) is provided with a slide groove, and the two ends of the cleaning brush (23) are slidably connected to the inner wall of the heat exchange shell (22) through the slide groove.
10. The flue gas carbon emission comprehensive treatment device according to claim 9, characterized in that: An ash discharge valve (30) is provided on the ash discharge pipe (28).