Large-scale gas decarbonization system for hydrogen-rich carbon circulating oxygen blast furnace
By designing a multi-cycle hydrogen-rich carbon circulating oxygen blast furnace system, the problem of insufficient processing capacity of existing devices was solved, and the decarbonization of coal gas in large and medium-sized blast furnaces was achieved, the CO2 content was reduced and the efficiency was improved.
Patent Information
- Application Number
- CN202422727664.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-11-08
AI Technical Summary
The existing hydrogen-rich carbon circulating oxygen blast furnace decarbonization device can only process 70,000-100,000 Nm3/h of coal gas, which cannot meet the needs of large and medium-sized blast furnaces, resulting in it being unable to be promoted in large and medium-sized blast furnaces.
A system was designed, which included a hydrogen-rich carbon circulating oxygen blast furnace, a coarse dust removal device, a dry dust removal device, a fine dust removal device, a compressor, an absorption tower, a flash tank, a nitrogen tank, a regeneration tower, a reboiler and other devices. Through multiple recycling and a one-stage absorption plus one-stage regeneration process, the system can achieve decarbonization of coal gas from large and medium-sized blast furnaces and reduce the CO2 content to below 3%.
It solves the problem of coal gas decarbonization in large and medium-sized blast furnaces, reduces solid fuel consumption and energy consumption, improves efficiency, and meets the needs of reducing carbon emissions in large and medium-sized blast furnaces.
Smart Images
Figure CN223433429U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of CO2 removal from metallurgical coal gas, in particular to a large-scale coal gas decarbonization system for a hydrogen-rich carbon circulating oxygen blast furnace. Background Art
[0002] The hydrogen-rich carbon circulating oxygen blast furnace process is a smelting process that uses oxygen blast to replace traditional heated air blast. In order to compensate for the thermodynamic conditions required for the physical and chemical reactions in the blast furnace caused by full oxygen blast, reduction of N2, and sharp decrease in the amount of bosh gas, it is necessary to remove CO2 from the top gas and form a reducing gas medium with a higher concentration of reducing components (CO and H2) to be sprayed into the blast furnace.
[0003] The decarburization device of the existing hydrogen-rich carbon circulating oxygen blast furnace is 400m 3 The coal gas decarbonization method for blast furnaces of the first stage and the coal gas decarbonization device for Ouye furnaces adopt a two-stage absorption / two-stage regeneration process. The rich liquid after preliminary stripping becomes semi-lean liquid and is extracted from the tower kettle. The semi-lean liquid is divided into two streams: one stream is pressurized by a semi-lean liquid pump, cooled by a semi-lean-rich liquid heat exchanger and a semi-lean liquid air cooler, and then sent to the middle of the absorption tower; the other stream of semi-lean liquid is pressurized by a pump and sent to the stripping regeneration tower for further regeneration, and finally becomes lean liquid and enters the regeneration tower kettle. The lean liquid is pressurized by a lean liquid pump, cooled step by step by a lean-rich liquid heat exchanger and a lean liquid air cooler, and then sent to the top of the absorption tower.
[0004] This device is the first industrial experimental verification of blast furnace decarbonization system. 3 The process production characteristics of the hydrogen-rich carbon cycle oxygen blast furnace, but it can only process 70,000-100,000 Nm 3 / h of gas volume. At present, the blast furnaces in my country's metallurgical industry adopt the principle of large-scale production. If they are to be promoted in large and medium-sized blast furnaces, they need to process 200,000-450,000 Nm 3 / h of decarbonized coal gas, so the current hydrogen-rich carbon circulating oxygen blast furnace has insufficient gas processing capacity. If this hydrogen-rich carbon circulating oxygen blast furnace process technology is to be promoted, the decarbonization device needs to be optimized and improved to make it more perfect and innovative. Utility Model Content
[0005] The purpose of this utility model is to provide a large-scale coal gas decarbonization system for hydrogen-rich carbon circulating oxygen blast furnace, so as to solve the problem that the current hydrogen-rich carbon circulating oxygen blast furnace system can only process 70,000-100,000 Nm 3 / h of coal gas volume, and it is still difficult to promote the technology in large and medium-sized blast furnaces.
[0006] In order to achieve the above-mentioned purpose, the basic scheme provided by the utility model is: a large-scale coal gas decarbonization system of a hydrogen-rich carbon circulating oxygen blast furnace, comprising a hydrogen-rich carbon circulating oxygen blast furnace, a coarse dust removal device, a dry dust removal device, a fine dust removal device, a compressor, an absorption tower, a flash tank, a nitrogen tank, a regeneration tower, and a reboiler. The hydrogen-rich carbon circulating oxygen blast furnace is connected to the dust removal unit, the dust removal unit is connected to a coal gas main, the dust removal unit and the compressor are connected through the coal gas main, the compressor is connected to a cooling water pipe, the cooling water pipe is respectively connected to a soft water pipe and a circulating water pipe, the other end of the soft water pipe is connected to a soft water supply device, the compressor is connected to a mixed liquid outlet pipe, the other end of the mixed liquid outlet pipe is connected to a compressor gas-liquid separator, the top of the compressor gas-liquid separator is connected to an outlet pipe, the outlet pipe is connected to the fine dust removal device, the outlet pipe is connected to an outlet branch pipe, the other end of the outlet branch pipe is connected to the absorption tower, and the compressor gas-liquid separator is connected to the compressor gas-liquid separator. The water outlet of the absorber is connected with a spray soft water cooler, which is connected with a circulating soft water filter. The circulating soft water filter is connected with a circulating water pipe. The bottom of the absorption tower is connected with pipe 1, and the other end of pipe 1 is connected with a flash tank. Pipe 1 is connected with several lean liquid pumps, and several lean liquid pumps are connected in parallel. The top of the absorption tower is connected with a purifier circulation unit, the flash tank is connected with a flash water outlet pipe and a flash gas outlet pipe, the other end of the flash water outlet pipe is connected with the regeneration tower, and the other end of the flash gas outlet pipe is connected with the gas pipeline network. The nitrogen tank is connected with a nitrogen main pipe, the nitrogen main pipe is connected with nitrogen pipe 1 and nitrogen pipe 2, nitrogen pipe 1 is connected with the flash water outlet pipe, nitrogen pipe 2 is connected with the regeneration tower, the regeneration tower is connected with the reboiler, and a regeneration gas circulation unit is provided on the top of the regeneration tower. The bottom of the regeneration tower is connected with a semi-lean liquid pipe 1, the semi-lean liquid pipe 1 is connected with the semi-lean liquid circulation unit, and the reboiler is connected with a condensate storage tank.
[0007] The working principle of the utility model is as follows: in large and medium-sized hydrogen-rich carbon circulating oxygen blast furnaces, after rough dust removal, dry dust removal and fine dust removal of the furnace top gas, the gas is pressurized by a compressor, and decarbonized and recycled through an absorption tower, a flash tank, a regeneration tower, a reboiler and other devices. The furnace top gas of large and medium-sized hydrogen-rich carbon circulating oxygen blast furnaces is cooled by a dust removal unit and then adopts a one-stage absorption plus a one-stage regeneration process. The lean liquid regenerated by the regeneration tower absorbs the acid gas in the absorption tower and becomes rich liquid, and then flashes in the flash tank and regenerates to become semi-lean liquid and is extracted from the tower kettle. After the semi-lean liquid is cooled by an air cooler, it is pressurized by a solution pump and sent to the top of the absorption tower to continue absorbing CO2. Among them, the purified gas circulation unit recycles the purified gas released in the absorption tower, the regenerated gas circulation unit recycles the regenerated gas released in the regeneration tower, and the semi-lean liquid circulation unit recycles the semi-lean liquid flowing out of the bottom of the regeneration tower, thereby achieving the purpose of multiple cycles.
[0008] The beneficial effect of the utility model is that the utility model solves the decarbonization problem of the top gas of large and medium-sized hydrogen-rich carbon circulating oxygen blast furnaces, which is 2500m 3The large coal gas decarburization system matched with the hydrogen-rich carbon cycle oxygen blast furnace further solves the problem of insufficient bosh gas after the hydrogen-rich carbon cycle oxygen blast furnace realizes full-oxygen smelting, reduces the CO2 in the reducing gas sprayed into the hydrogen-rich carbon cycle oxygen blast furnace to below 3%, and meets the demand of reducing carbon emission, reducing solid fuel consumption, reducing energy consumption, and improving efficiency of the hydrogen-rich carbon cycle oxygen blast furnace.
[0009] In scheme two, which is a preferred scheme of the basic scheme, the purified gas circulation unit comprises a purified gas main pipe and a coal gas heater, a purified gas branch pipe one and a purified gas branch pipe two are communicated with the purified gas main pipe, a purified gas separation tank is communicated with the other end of the purified gas main pipe, the other end of the purified gas branch pipe one is communicated with the coal gas heater, the coal gas heater is communicated with the expander, the purified gas branch pipe two is communicated with the coal gas heater, and the purified gas separation tank is communicated with the coal gas heater.
[0010] In scheme three, which is a preferred scheme of the basic scheme, the regenerated gas circulation unit comprises a regenerated gas cooler, a regenerated gas gas-liquid separator, a solution storage tank, and a gas storage tank, the top of the regeneration tower is communicated with the regenerated gas cooler, the regenerated gas cooler is communicated with the regenerated gas gas-liquid separator, the top of the regenerated gas gas-liquid separator is communicated with a regenerated gas outlet pipe, the other end of the regenerated gas outlet pipe is communicated with the gas storage tank, the bottom of the regenerated gas gas-liquid separator is communicated with a regenerated gas outlet water pipe, the regenerated gas outlet water pipe is communicated with the regeneration tower, a regenerated gas inlet water pipe is communicated with the regenerated gas outlet water pipe, and the regenerated gas inlet water pipe is communicated with the solution storage tank.
[0011] In scheme four, which is a preferred scheme of the basic scheme, the semi-lean liquid circulation unit comprises a semi-lean liquid filter, a semi-lean liquid heat exchanger, and an air cooler, the semi-lean liquid pipe one is communicated with the semi-lean liquid heat exchanger, the semi-lean liquid heat exchanger is communicated with the air cooler, the air cooler is communicated with the upper end of the absorption tower, the semi-lean liquid pipe one is communicated with a semi-lean liquid pipe two, the semi-lean liquid pipe two is communicated with the semi-lean liquid filter, and the semi-lean liquid filter is communicated with the lower end of the regeneration tower.
[0012] In scheme five, which is a preferred scheme of the basic scheme, the pipeline one is communicated with a hydraulic turbine, and the hydraulic turbine is coaxially directly driven with the lean liquid pump.
[0013] In scheme six, which is a preferred scheme of the basic scheme, the condensate storage tank is communicated with a condensate pipe, and the condensate pipe is communicated with the coal gas heater.
[0014] In scheme seven, which is a preferred scheme of the basic scheme, the regeneration tower is communicated with a slag flushing water heat exchanger.
[0015] In scheme eight, which is a preferred scheme of the basic scheme, the mixed liquid branch pipe is communicated with the mixed liquid pipe, the other end of the mixed liquid branch pipe is communicated with the coal gas main pipe, and the mixed liquid branch pipe is provided with an emergency return valve. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic diagram of a hydrogen-rich carbon cycle oxygen blast furnace large coal gas decarburization system. DETAILED DESCRIPTION
[0017] The utility model will be further explained in detail through specific implementation:
[0018] The reference signs in the description drawings include: 1. hydrogen-rich carbon cycle oxygen blast furnace, 2. compressor, 3. absorption tower, 4. flash tank, 5. nitrogen tank, 6. regeneration tower, 7. reboiler, 8. coal gas main pipe, 9. cooling water pipe, 10. soft water pipe, 11. circulating water pipe, 12. soft water supply device, 13. circulating soft water filter, 14. liquid injection soft water cooler, 15. mixed liquid outlet pipe, 16. compressor gas-liquid separator, 17. gas outlet pipe, 18. pipeline one, 19. lean liquid pump, 20. flash water outlet pipe, 21. flash gas outlet pipe, 22. coal gas pipe network, 23. nitrogen main pipe, 24. nitrogen pipe one, 25. nitrogen pipe two, 26. half lean liquid pipe one, 27. condensed liquid storage tank, 28. purified gas main pipe, 29. coal gas heating furnace, 30. purified gas branch pipe one, 31. purified gas branch pipe two, 32. expander, 33. coal gas heater, 34. purified gas separation tank, 35. regeneration gas cooler, 36. regeneration gas gas-liquid separator, 37. solution storage tank, 38. gas storage tank, 39. regeneration gas gas outlet pipe, 40. regeneration gas water outlet pipe, 41. regeneration gas water inlet pipe, 42. half lean liquid filter, 43. half lean liquid heat exchanger, 44. air cooler, 45. half lean liquid pipe two, 46. hydraulic turbine, 47. condensed liquid pipe, 48. deslagging water heat exchanger, 49. mixed liquid branch pipe, 50. emergency return circuit switch valve, 51. coarse dust removal device, 52. dry dust removal device, 53. fine dust removal device, 54. gas outlet branch pipe.
[0019] EMBODIMENT
[0020] The embodiment is as follows: Figure 1The hydrogen-rich carbon cycle oxygen blast furnace large coal gas decarburization system is shown: a hydrogen-rich carbon cycle oxygen blast furnace 1, a rough dust removal device 51, a dry dust removal device 52, a fine dust removal device 53, a compressor 2, an absorption tower 3, a flash tank 4, a nitrogen tank 5, a regeneration tower 6, a reboiler 7, the hydrogen-rich carbon cycle oxygen blast furnace 1 is communicated with the dust removal unit, the fine dust removal device 53 is communicated with a coal gas main pipe 8, the fine dust removal device 53 and the compressor 2 are communicated through the coal gas main pipe 8, the compressor 2 is communicated with a cooling water pipe 9, the cooling water pipe 9 is respectively communicated with a soft water pipe 10 and a circulating water pipe 11, the other end of the soft water pipe 10 is communicated with a soft water supply device 12, the compressor 2 is communicated with a mixed liquid outlet pipe 15, the mixed liquid outlet pipe 15 is communicated with a mixed liquid branch pipe 49, the other end of the mixed liquid branch pipe 49 is communicated with the coal gas main pipe 8, the mixed liquid branch pipe 49 is provided with an emergency return valve 50, the other end of the mixed liquid outlet pipe 15 is communicated with a compressor gas-liquid separator 16, the top of the compressor gas-liquid separator 16 is communicated with a gas outlet pipe 17, the gas outlet pipe 17 is communicated with the fine dust removal device 53, the gas outlet pipe 17 is communicated with a gas branch pipe 54, the other end of the gas branch pipe 54 is communicated with the absorption tower 3, the water outlet of the compressor gas-liquid separator 16 is communicated with a liquid spray soft water cooler 14, the liquid spray soft water cooler 14 is communicated with a circulating soft water filter 13, the circulating soft water filter 13 is communicated with the circulating water pipe 11, the bottom of the absorption tower 3 is communicated with a pipeline one 18, the other end of the pipeline one 18 is communicated with the flash tank 4, the pipeline one 18 is communicated with a plurality of lean liquid pumps 19, the plurality of lean liquid pumps 19 are connected in parallel, the pipeline one 18 is communicated with a liquid turbine 46, the liquid turbine 46 is coaxial direct drive with the lean liquid pump 19, the top of the absorption tower 3 is communicated with a purifier circulating unit, the purifier circulating unit includes a purifier gas main pipe 28 and a coal gas heating furnace 29, the purifier gas main pipe 28 is communicated with a purifier gas branch pipe one 30 and a purifier gas branch pipe two 31, the other end of the purifier gas main pipe 28 is communicated with a purifier gas separation tank 34, the other end of the purifier gas branch pipe one 30 is communicated with a coal gas heater 33, the coal gas heater 33 is communicated with an expander 32, the purifier gas branch pipe two 31 is communicated with the coal gas heater 33, the purifier gas separation tank 34 is communicated with the coal gas heating furnace 29, the flash tank 4 is communicated with a flash water outlet pipe 20 and a flash gas outlet pipe 21, the other end of the flash water outlet pipe 20 is communicated with the regeneration tower 6, the other end of the flash gas outlet pipe 21 is communicated with a coal gas pipe network 22, the nitrogen tank 5 is communicated with a nitrogen main pipe 23, the nitrogen main pipe 23 is communicated with a nitrogen pipe one 24 and a nitrogen pipe two 25, the nitrogen pipe one 24 is communicated with the flash water outlet pipe 20, the nitrogen pipe two 25 is communicated with the regeneration tower 6, the regeneration tower 6 is communicated with the reboiler 7, the regeneration tower 6 is communicated with a deslag water heat exchanger 48.The top of the regeneration tower 6 is provided with a regeneration gas circulating unit, which comprises a regeneration gas cooler 35, a regeneration gas gas-liquid separator 36, a solution storage tank 37 and a gas storage tank 38. The top of the regeneration tower 6 is communicated with the regeneration gas cooler 35, the regeneration gas cooler 35 is communicated with the regeneration gas gas-liquid separator 36, the top of the regeneration gas gas-liquid separator 36 is communicated with a regeneration gas outlet pipe 39, the other end of the regeneration gas outlet pipe 39 is communicated with the gas storage tank 38, the bottom of the regeneration gas gas-liquid separator 36 is communicated with a regeneration gas outlet pipe 40, the regeneration gas outlet pipe 40 is communicated with the regeneration tower 6, the regeneration gas outlet pipe 40 is communicated with a regeneration gas inlet pipe 41, the regeneration gas inlet pipe 41 is communicated with the solution storage tank 37, the bottom of the regeneration tower 6 is communicated with a semi-lean liquid pipe 26, the semi-lean liquid pipe 26 is communicated with a semi-lean liquid circulating unit, the semi-lean liquid circulating unit comprises a semi-lean liquid filter 42, a semi-lean liquid heat exchanger 43 and an air cooler 44, the semi-lean liquid pipe 26 is communicated with the semi-lean liquid heat exchanger 43, the semi-lean liquid heat exchanger 43 is communicated with the air cooler 44, the air cooler 44 is communicated with the upper end of the absorption tower 3, the semi-lean liquid pipe 26 is communicated with a semi-lean liquid pipe 45, the semi-lean liquid pipe 45 is communicated with the semi-lean liquid filter 42, the semi-lean liquid filter 42 is communicated with the lower end of the regeneration tower 6, the reboiler 7 is communicated with a condensate storage tank 27, the bottom of the condensate storage tank 27 is communicated with a condensate pipe 47, and the condensate pipe 47 is communicated with the coal gas heater 33.
[0021] The embodiment of the present application is:
[0022] The top gas from the hydrogen-rich carbon circulating oxygen blast furnace 1 first enters the coarse dust removal device 51, the dry dust removal device 52, and the fine dust removal device 53 in sequence for dust removal. The dust-removed top gas enters the compressor 2 through the gas main 8 for pressurization. The soft water supply device 12 inputs soft water through the soft water pipe 10 and is sprayed into the compressor 2 from the cooling water pipe 9. Then, the soft water and top gas in the compressor 2 are discharged through the mixed liquid outlet pipe 15 and divided into two paths. One path enters the gas main 8 from the mixed liquid branch pipe 49. When the pressure in the pipeline is too high, the emergency circuit switch valve 50 is opened to allow the mixed liquid to enter the gas branch pipe 8 for compression again. The other path enters the compressor gas-liquid separator 16, and the separated liquid enters the spray soft water. In the cooler 14, after being cooled, it enters the compressor 2 for circulating liquid spraying. The separated gas is divided into two paths. One path enters the fine dust removal device 53 through the outlet pipe 17 for repeated compression and recycling. The other path enters the absorption tower 3 through the outlet branch pipe 54 and contacts with the lean liquid in the absorption tower 3. The purified gas generated in the absorption tower 3 is divided into two paths. One path enters the purified gas separation tank 34 from the purified gas main pipe 28, and the other path enters the gas heater 33 from the purified gas branch pipe 2 31. The heated purified gas enters the expander 32 for decompression. The purified gas after decompression enters the purified gas branch pipe 1 30 and enters the purified gas separation tank 34 together with the purified gas in the purified gas main pipe 28, and then enters the gas heating furnace 29 for heating. After the lean liquid in the tower 3 absorbs CO2 in the top gas and becomes rich liquid, it enters the flash tank 4 from the pipeline 18 for flash evaporation. The flash steam after flash evaporation is discharged from the flash evaporation outlet pipe 21 and enters the gas heating furnace 29 for use. The rich liquid after flash evaporation is discharged from the flash evaporation outlet pipe 20 and enters the regeneration tower 6. At the same time, the nitrogen tank 5 pressurizes the rich liquid through the nitrogen pipe 1 24 and the nitrogen pipe 2 25, so that the rich liquid enters the regeneration tower 6 to reduce the pressure difference. After entering the regeneration tower 6, the rich liquid enters the reboiler 7 and the slag flushing water heat exchanger 48 for heat exchange and heating. The condensate generated when the reboiler 7 is working enters the condensate storage tank 27, and then enters the gas heater 33 from the condensate storage tank 27 for charging. After heating, it returns to the regeneration tower 6 for regeneration and becomes semi-lean liquid. The regeneration gas generated in the regeneration process is discharged from the top of the regeneration tower 6, cooled by the regeneration gas cooler 35, and then enters the regeneration gas-liquid separator 36 for gas-liquid separation. The separated liquid is discharged from the regeneration gas outlet pipe 40 and re-enters the regeneration tower 6 for regeneration. At the same time, the solution storage tank 37 enters the gas storage tank 38 through the regeneration gas outlet pipe 39 for storage. The semi-lean liquid formed is discharged from the bottom of the regeneration tower 6 and is divided into two paths. One path enters the semi-lean liquid filter 42 from the semi-lean liquid pipe 2 45, and enters the regeneration tower 6 again after filtration. The other path enters the semi-lean liquid heat exchanger 43 from the semi-lean liquid pipe 1 26 for heat exchange and cooling. After cooling, it passes through the air cooler 44 for secondary cooling, and then enters from the upper part of the absorption tower 3 to be recycled and absorbed CO2.
[0023] The above only is the embodiment of the present application, and the well-known specific structure and characteristics and other common knowledge in the scheme are not described too much. It should be pointed out that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.
Claims
1. A large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace, characterized in that: The invention comprises a hydrogen-rich carbon circulating oxygen blast furnace (1), a coarse dust removal device (51), a dry dust removal device (52), a fine dust removal device (53), a compressor (2), an absorption tower (3), a flash tank (4), a nitrogen tank (5), a regeneration tower (6), and a reboiler (7). The hydrogen-rich carbon circulating oxygen blast furnace (1) is connected to the fine dust removal device (53), the fine dust removal device (53) is connected to a gas main (8), the fine dust removal device (53) and the compressor (2) are connected via the gas main (8), the compressor (2) is connected to a cooling water pipe (9), and the cooling water pipe (9) is respectively connected to a soft water pipe (10) and a circulating water pipe (11). The other end of the soft water pipe (10) is connected to a soft water supply device (12), the compressor (2) is connected to a mixed liquid outlet pipe (15), the other end of the mixed liquid outlet pipe (15) is connected to a compressor gas-liquid separator (16), the top of the compressor gas-liquid separator (16) is connected to an air outlet pipe (17), the air outlet pipe (17) is connected to a fine dust removal device (53), the air outlet pipe (17) is connected to an air outlet branch pipe (54), the other end of the air outlet branch pipe (54) is connected to an absorption tower (3), the water outlet of the compressor gas-liquid separator (16) is connected to a liquid spray soft water cooler (14), the liquid spray soft water cooler The absorber (14) is connected to a circulating soft water filter (13), the circulating soft water filter (13) is connected to a circulating water pipe (11), the bottom of the absorption tower (3) is connected to a pipe (18), the other end of the pipe (18) is connected to a flash tank (4), the pipe (18) is connected to a plurality of lean liquid pumps (19), the plurality of lean liquid pumps (19) are connected in parallel, the top of the absorption tower (3) is connected to a purifier circulation unit, the flash tank (4) is connected to a flash water outlet pipe (20) and a flash gas outlet pipe (21), the other end of the flash water outlet pipe (20) is connected to the regeneration tower (6), the flash gas outlet pipe (21) is connected to the regeneration tower (6), and the regeneration tower (6) is connected to the regeneration tower (6). The other end is connected to a gas network (22), the nitrogen tank (5) is connected to a nitrogen main pipe (23), the nitrogen main pipe (23) is connected to a nitrogen pipe 1 (24) and a nitrogen pipe 2 (25), the nitrogen pipe 1 (24) is connected to a flash water outlet pipe (20), the nitrogen pipe 2 (25) is connected to a regeneration tower (6), the regeneration tower (6) is connected to a reboiler (7), a regeneration gas circulation unit is provided on the top of the regeneration tower (6), the bottom of the regeneration tower (6) is connected to a semi-lean liquid pipe 1 (26), the semi-lean liquid pipe 1 (26) is connected to a semi-lean liquid circulation unit, and the reboiler (7) is connected to a condensate storage tank (27).
2. A large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1, characterized in that: The purified gas circulation unit includes a purified gas main pipe (28) and a gas heating furnace (29). The purified gas main pipe (28) is connected to a purified gas branch pipe 1 (30) and a purified gas branch pipe 2 (31). The other end of the purified gas main pipe (28) is connected to a purified gas separation tank (34). The other end of the purified gas branch pipe 1 (30) is connected to a gas heater (33). The gas heater (33) is connected to an expander (32). The purified gas branch pipe 2 (31) is connected to the expander (32). The purified gas separation tank (34) is connected to the gas heating furnace (29).
3. A large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1, characterized in that: The regeneration gas circulation unit comprises a regeneration gas cooler (35), a regeneration gas gas-liquid separator (36), a solution storage tank (37) and a gas storage tank (38). The top of the regeneration tower (6) is connected to the regeneration gas cooler (35), the regeneration gas cooler (35) is connected to the regeneration gas gas-liquid separator (36), the top of the regeneration gas gas-liquid separator (36) is connected to a regeneration gas outlet pipe (39), the other end of the regeneration gas outlet pipe (39) is connected to the gas storage tank (38), the bottom of the regeneration gas gas-liquid separator (36) is connected to a regeneration gas water outlet pipe (40), the regeneration gas water outlet pipe (40) is connected to the regeneration tower (6), the regeneration gas water outlet pipe (40) is connected to a regeneration gas water inlet pipe (41), and the regeneration gas water inlet pipe (41) is connected to the solution storage tank (37).
4. A large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1, characterized in that: The semi-lean liquid circulation unit includes a semi-lean liquid filter (42), a semi-lean liquid heat exchanger (43) and an air cooler (44); the semi-lean liquid pipe 1 (26) is connected to the semi-lean liquid heat exchanger (43); the semi-lean liquid heat exchanger (43) is connected to the air cooler (44); the air cooler (44) is connected to the upper end of the absorption tower (3); the semi-lean liquid pipe 2 (45) is connected to the semi-lean liquid pipe 1 (26); the semi-lean liquid pipe 2 (45) is connected to the semi-lean liquid filter (42); and the semi-lean liquid filter (42) is connected to the lower end of the regeneration tower (6).
5. The large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1 is characterized in that: The pipeline (18) is connected to a hydraulic turbine (46), and the hydraulic turbine (46) is directly driven coaxially with the lean liquid pump (19).
6. A large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1, characterized in that: The bottom of the condensate storage tank (27) is connected to a condensate pipe (47), and the condensate pipe (47) is connected to the gas heater (33).
7. The large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1 is characterized in that: The regeneration tower (6) is connected to a slag flushing water heat exchanger (48).
8. The large-scale gas decarbonization system for hydrogen-rich carbon cycle oxygen blast furnace according to claim 1 is characterized in that: The mixed liquid outlet pipe (15) is connected to a mixed liquid branch pipe (49), the other end of which is connected to the gas main pipe (8), and an emergency circuit switch valve (50) is provided on the mixed liquid branch pipe (49).