Heavy-load test run method for decarburization device of large-scale hydrogen-rich carbon cycle oxygen blast furnace
By passing the furnace top gas generated by the traditional blast furnace into the decarbonization device and using sensors and infrared spectrometers to detect the gas composition, the problem of lack of effective heavy-load test-drive method after maintenance of the large hydrogen-rich carbon circulating oxygen blast furnace decarbonization device is solved, achieving efficient and accurate detection and cost reduction.
Patent Information
- Application Number
- CN202411593824.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-02-25
AI Technical Summary
There is a lack of heavy-load test-running methods for maintenance and improvement of the decarbonization device of 2500m3-level large hydrogen-rich carbon circulating oxygen blast furnace after the maintenance and efficiency of the decarbonization device, resulting in the equipment starting, running and stopping consumes a lot of costs, affecting actual production.
By passing part of the furnace top gas generated by the 2500m3 level traditional blast furnace into the decarbonization device, the gas composition in the purified gas and alcohol amine solution is detected using a gas sensor and infrared spectrometer, the maintenance status of the absorption tower, flash tank, regeneration tower and gas-liquid separator is judged, and the heavy load test drive of the decarbonization device is realized.
It reduces the detection cost and does not require restarting a large hydrogen-rich carbon circulating oxygen blast furnace, which can accurately detect the after-maintenance of the decarbonized device, improving detection efficiency and accuracy.
Smart Images
Figure CN119506500A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of decarburization device maintenance, and in particular to a method for heavy-load commissioning of a large-scale hydrogen-rich carbon circulating oxygen blast furnace decarburization device. 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. The top gas of the hydrogen-rich carbon circulating oxygen blast furnace contains 28%-35% of carbon dioxide in the acidic gas. The carbon dioxide in the top gas is removed by a decarbonization device. The reducing gas from which carbon dioxide has been removed is heated and then circulated and sprayed into the interior of the hydrogen-rich carbon circulating oxygen blast furnace by a tuyere device to increase its calorific value and the reducing atmosphere in the furnace and reduce the solid fuel consumption of the blast furnace.
[0003] Heavy-load test refers to a comprehensive test conducted before the equipment is put into operation. It simulates the operating process and parameters under actual working conditions to ensure that the equipment can operate normally in actual applications and meet the expected performance requirements. This process includes experiments on the entire process of equipment startup, operation and shutdown.
[0004] 2500m 3 The decarburization device of a large-scale hydrogen-rich carbon circulating oxygen blast furnace needs to be overhauled and improved after long-term use. After the efficiency improvement and overhaul are completed, the decarburization device needs to be tested under heavy load. 3 A large-scale hydrogen-rich carbon circulating oxygen blast furnace is used to test its decarbonization device. The startup, operation and shutdown of the equipment in this process will consume a lot of costs, which is not conducive to actual production. Summary of the invention
[0005] The purpose of the present invention is to provide a method for heavy-load commissioning of a decarburization device of a large-scale hydrogen-rich carbon-circulating oxygen blast furnace, so as to solve the problem that there is no method for heavy-load commissioning of a decarburization device of a 2500m3 large-scale hydrogen-rich carbon-circulating oxygen blast furnace after maintenance and efficiency improvement in the prior art.
[0006] To achieve the above-mentioned purpose, the basic scheme provided by the present invention is: a device for heavy-load test of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarbonization device, comprising two gas sensors, two infrared spectrometers, gas pipe 1, gas pipe 2, liquid pipe 1 and liquid pipe 2, the blast furnace gas outlet is connected to the gas inlet of the absorption tower, the decarbonization gas outlet of the absorption tower is connected to gas pipe 1, gas pipe 1 is connected to the gas network, the liquid outlet of the absorption tower is connected to the liquid inlet of the flash tank, the carbon dioxide outlet of the flash tank is connected to the gas pipe 2. Gas pipe 2 is connected to the gas network, each gas sensor is connected to gas pipe 1 and gas pipe 2, the liquid outlet of the flash tank is connected to the liquid inlet on the top of the regeneration tower, the liquid outlet on the top of the regeneration tower is connected to the liquid inlet of the reboiler, the liquid outlet of the reboiler is connected to the liquid inlet on the bottom of the regeneration tower, the liquid outlet of the regeneration tower is connected to liquid pipe 1, the gas outlet of the regeneration tower is connected to the gas-liquid separator, the liquid outlet of the gas-liquid separator is connected to liquid pipe 2, and each infrared spectrometer is connected to liquid pipe 1 and liquid pipe 2.
[0007] The principle and beneficial effect of the present invention are: by 3 A part of the top gas produced by the conventional blast furnace is passed into the decarbonization device, so that the decarbonization device can be tested for efficiency improvement and maintenance without restarting 2500m 3 A large-scale hydrogen-rich carbon circulating oxygen blast furnace can be used to reduce the detection cost. By detecting the proportion of CO2, N2 and CO in the purified gas at the absorption tower, the efficiency improvement and the condition of the absorption tower after maintenance can be judged. By detecting the carbon dioxide concentration in the alcohol amine solution at the regeneration tower and the gas-liquid separator, the efficiency improvement and the condition of the regeneration tower and the gas-liquid separator after maintenance can be judged. The condition of the decarbonization device after maintenance can be accurately detected.
[0008] Scheme 2, which is a basic scheme, is a method for heavy-load commissioning of a large-scale hydrogen-rich carbon circulating oxygen blast furnace decarbonization device, comprising the following steps: S1. 2500m 3 The large-scale hydrogen-rich carbon cycle oxygen blast furnace is replaced by a conventional blast furnace. A part of the top gas produced is decompressed and introduced into the gas network. The other part passes through the fine dust removal device and is pressurized by the compressor to enter the absorption tower. The top gas contacts with the alcohol amine solution in the absorption tower to capture carbon dioxide. The gas content ratio in the purified gas is detected by the gas sensor to judge the maintenance status of the absorption tower. The captured purified gas enters the gas network through the gas pipe 1, and the captured alcohol amine rich liquid enters the flash tank from the bottom of the absorption tower. S2. The alcohol amine rich liquid in the flash tank is flashed at reduced pressure to flash out a mixed gas of part of carbon dioxide and carbon monoxide. The gas components in the mixed gas are monitored by a gas sensor to determine the maintenance status of the flash tank. The mixed gas enters the gas network from gas pipe 2. The alcohol amine rich liquid after flashing enters the upper part of the regeneration tower from the bottom of the flash tank; S3. The alcohol amine rich solution in the upper part of the regeneration tower is regenerated and analyzed, and the generated gas is discharged from the top of the regeneration tower, and the regenerated alcohol amine solution enters the reboiler from the upper part of the regeneration tower; S4. After the alcohol amine solution in the reboiler is heated, it is returned to the lower part of the regeneration tower in S3 for further regeneration and analysis. The generated analytical gas is discharged from the lower part of the regeneration tower. The analyzed alcohol amine solution is inspected by an infrared spectrometer to determine the maintenance of the reboiler and the regeneration tower. The analyzed alcohol amine solution is returned to the top of the absorption tower in S1; S5. The gas discharged from the upper and lower parts of the regeneration tower enters the gas-liquid separator for gas-liquid separation. The separated carbon dioxide gas is liquefied and stored. The separated alcoholamine solution is tested by an infrared spectrometer to determine the maintenance status of the gas-liquid separator. The separated alcoholamine solution is returned to the top of the absorption tower in S1.
[0009] Scheme 3: This is the preferred option of Scheme 2. In step S1, the flow rate of the top gas after fine dust removal is 80000-250000Nm 3 / h, the gas content ratio is: CO2: 18-24%; N2: 50-56%; CO: 21-27%. The gas pressure after pressurization by the compressor increases from 0.12MPa-0.2MPa to 1.2-1.7MPa. The purified gas flow rate after capture by the alcohol amine solution is 56000-170000Nm 3 / h, calorific value is 4500-5000kJ / Nm 3 , detect whether the gas content ratio in the purified gas is: CO2: 0.5-2.7%; N2: 1.3-6.2%; CO: 0.6-3%. If it is not in this range, re-introduce the purified gas into the bottom of the absorption tower, close the top gas entering the decarbonization device, and overhaul the absorption tower again; if it is in this range, the alcoholamine rich liquid enters the flash tank, and the absorption tower overhaul is completed; the gas is pressurized to a certain pressure by a compressor for long-distance transportation. In the absorption tower, the alcoholamine solution is in full contact with the carbon dioxide in the top gas. The captured purified gas can be introduced into the gas official website as fuel gas. By detecting the gas content ratio in the purified gas, the overhaul of the absorption tower can be checked.
[0010] Scheme 4 is the preferred option of Scheme 2. In step S2, if it is detected that the mixed gas contains gas other than carbon dioxide and carbon monoxide, the mixed gas is reintroduced into the flash evaporator, the top gas entering the decarbonization device is shut down, and the flash evaporator is overhauled again. If it is detected that the mixed gas contains only carbon dioxide and carbon monoxide, the mixed gas is introduced into the gas network, and the flash evaporator is overhauled. The mixed gas entering the gas network is mixed with the purified gas in S1 at the gas network, and the calorific value of the purified gas is increased from 4500 to 5000 kJ / Nm 3 Reduced to 3000-3500 kJ / Nm 3The maintenance status of the flash tank can be detected by detecting the gas composition in the flash steam, and the calorific value of the purified gas can be reduced to meet the use of different equipment, thereby increasing the practicality of the purified gas.
[0011] Scheme 5 is a preferred option of Scheme 2. In step S4, the temperature of the alcoholamine solution discharged from the upper part of the regeneration tower is 50-60°C, and the temperature is 70-80°C after being heated in the reboiler. By increasing the temperature of the alcoholamine solution, the absorption and analysis of the regeneration tower are enhanced, thereby achieving gas separation and purification.
[0012] Scheme 6 is the preferred option of Scheme 2. In steps S3 to S5, the amine solution discharged from the regeneration tower and the gas-liquid separator is detected by infrared spectroscopy to detect whether the carbon dioxide concentration in the amine solution is 21.3 L / L, with a deviation of ±2 L. If it is not within this range, the amine solution is reintroduced into the regeneration tower, the top gas entering the decarbonization device is shut off, and the reboiler, regeneration tower and gas-liquid separator are overhauled again; if it is within this range, the amine solution returns to the top of the absorption tower in S1, and the reboiler, regeneration tower and gas-liquid separator are overhauled; the overhaul status of the regeneration tower and the gas-liquid separator is judged by detecting the carbon dioxide concentration in the amine solution, and the overhaul status of the decarbonization device can be accurately detected. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 The present invention is a process flow chart of a method for heavy-load commissioning of a large-scale hydrogen-rich carbon circulating oxygen blast furnace decarburization device. DETAILED DESCRIPTION
[0014] The present invention is further described in detail below through specific embodiments: The reference numerals in the drawings of the specification include: 1. gas sensor, 2. infrared spectrometer, 3. blast furnace, 4. absorption tower, 5. gas pipe 1, 6. gas pipe 2, 7. gas pipe network, 8. flash tank, 9. regeneration tower, 10. reboiler, 11 gas-liquid separator, 12. liquid pipe 1, 13. liquid pipe 2, 14. pressurizer.
[0015] Example like Figure 1As shown: a device for heavy-load test of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarbonization device, including two gas sensors 1, two infrared spectrometers 2, gas pipe 1 5, gas pipe 2 6, liquid pipe 1 12 and liquid pipe 2 13, the blast furnace gas outlet of the blast furnace 3 is connected to the gas inlet of the absorption tower 4, the decarbonized coal gas outlet of the absorption tower 4 is connected to the gas pipe 1 5, the gas pipe 1 5 is connected to the gas network 7, the liquid outlet of the absorption tower 4 is connected to the liquid inlet of the flash tank 8, the carbon dioxide outlet of the flash tank 8 is connected to the gas pipe 2 6, and the gas pipe 2 6 is connected to the gas network 7 Each gas sensor 1 is connected to gas pipe one 5 and gas pipe two 6, the liquid outlet of the flash tank 8 is connected to the liquid inlet at the top of the regeneration tower 9, the liquid outlet at the top of the regeneration tower 9 is connected to the liquid inlet of the reboiler 10, the liquid outlet of the reboiler 10 is connected to the liquid inlet at the bottom of the regeneration tower 9, the liquid outlet of the regeneration tower 9 is connected to liquid pipe one 12, the gas outlet of the regeneration tower 9 is connected to the gas-liquid separator 11, the liquid outlet of the gas-liquid separator 11 is connected to liquid pipe two 13, and each infrared spectrometer 2 is connected to liquid pipe one 12 and liquid pipe two 13.
[0016] A method for heavy-load commissioning of a large-scale hydrogen-rich carbon circulating oxygen blast furnace decarburization device comprises the following steps: S1. 2500m 3 The conventional blast furnace replaces the large hydrogen-rich carbon cycle oxygen blast furnace. A part of the top gas produced is introduced into the gas pipe network 7 after decompression, and the other part is pressurized by the compressor 14 after passing through the fine dust removal device and entering the absorption tower 4. The top gas contacts with the alcohol amine solution in the absorption tower 4 to capture carbon dioxide. The gas content ratio in the purified gas is detected by the gas sensor 1, so as to judge the maintenance status of the absorption tower. The initial flow rate of the top gas is 80000-250000Nm 3 / h, the gas content is: CO2: 18-24%; N2: 50-56%; CO: 21-27%. After being pressurized by the compressor 14, the gas pressure increases from 0.12MPa-0.2MPa to 1.2-1.7MPa. The purified gas flow rate after being captured by the alcohol amine solution is 56000-170000Nm 3 / h, calorific value is 4500-5000kJ / Nm 3 , detect whether the gas content ratio in the purified gas is: CO2: 0.5-2.7%; N2: 1.3-6.2%; CO: 0.6-3%. If it is not within this range, the purified gas is reintroduced into the bottom of the absorption tower 4, the top gas entering the decarbonization device is closed, and the absorption tower 4 is overhauled again; if it is within this range, the alcohol amine rich liquid enters the flash tank 8, and the absorption tower 4 is overhauled, and the captured purified gas enters the gas network 7 from the gas pipe 1 5, and the captured alcohol amine rich liquid enters the flash tank 8 from the bottom of the absorption tower 4; S2. The alcohol amine rich liquid in the flash tank 8 is flashed at reduced pressure to flash out a mixed gas of part of carbon dioxide and carbon monoxide. The gas components in the mixed gas are monitored by the gas sensor 1. If it is detected that the mixed gas contains gases other than carbon dioxide and carbon monoxide, the mixed gas is reintroduced into the flash evaporator 8, the top gas entering the decarbonization device is shut off, and the flash evaporator 8 is overhauled again; if it is detected that the mixed gas contains only carbon dioxide and carbon monoxide, the mixed gas is introduced into the gas network 7, and the overhaul of the flash evaporator 8 is completed. The mixed gas entering the gas network 7 is mixed with the purified gas in S1 to increase the calorific value of the purified gas from 4500-5000 kJ / Nm 3 Reduced to 3000-3500 kJ / Nm 3 The mixed gas enters the gas network 7 from the gas pipe 2 6, and the alcohol amine rich liquid after flash evaporation enters the upper part of the regeneration tower 9 from the bottom of the flash tank 8; S3. The alcoholamine rich solution in the upper portion of the regeneration tower 9 is regenerated and analyzed, and the generated gas is discharged from the top of the regeneration tower 9, and the regenerated alcoholamine solution enters the reboiler 10 from the upper portion of the regeneration tower 9; S4. The initial temperature of the amine solution is 50-60°C. After being heated by the reboiler 10, the temperature is 70-80°C and returned to the lower part of the regeneration tower 9 in S3 for further regeneration and analysis. The analyzed amine solution is tested by the infrared spectrometer 2. The amine solution discharged from the regeneration tower 9 is detected by the infrared spectrometer to detect whether the carbon dioxide concentration in the amine solution is 21.3L / L, and the deviation value is ±2L. If it is not within this interval, the amine solution is reintroduced into the regeneration tower 9, the top gas entering the decarbonization device is closed, and the reboiler 10 and the regeneration tower 9 are overhauled again; if it is within this interval, the amine solution returns to the top of the absorption tower 4 in S1, and the reboiler 10 and the regeneration tower 9 are overhauled, and the generated analysis gas is discharged from the lower part of the regeneration tower 9, and the analyzed amine solution returns to the top of the absorption tower 4 in S1; S5. The gas discharged from the upper and lower parts of the regeneration tower 9 enters the gas-liquid separator 11 for gas-liquid separation, and the separated amine solution is inspected by the infrared spectrometer 2. The amine solution discharged from the regeneration tower 9 and the gas-liquid separator 11 is detected by the infrared spectrometer to detect whether the carbon dioxide concentration in the amine solution is 21.3L / L, and the deviation value is ±2L. If it is not within this interval, the amine solution is reintroduced into the regeneration tower 9 and the gas-liquid separator 11, the top gas entering the decarbonization device is closed, and the reboiler 10, the regeneration tower 9 and the gas-liquid separator 11 are overhauled again; if it is within this interval, the amine solution returns to the top of the absorption tower in S1, and the reboiler 10, the regeneration tower 9 and the gas-liquid separator 11 are overhauled, the separated carbon dioxide gas is liquefied and stored, and the separated amine solution is returned to the top of the absorption tower 4 in S1.
[0017] The implementation method of this embodiment is: before the test, 2500m 3The large-scale hydrogen-rich carbon cycle oxygen blast furnace was switched to a 2500m 3 Conventional blast furnace; During the test, the 2500m 3 After part of the top gas produced by the conventional blast furnace 1 passes through the fine dust removal device, the top gas flow rate is 80000-250000Nm 3 / h, the gas content is: CO2: 18-24%; N2: 50-56%; CO: 21-27%, and the gas is passed into the decarbonization device to purify the top gas. The gas pressurized by the compressor 14 increases the gas pressure from 0.12MPa-0.2MPa to 1.2-1.7MPa, enters from the bottom of the absorption tower 4, contacts with the alcohol amine solution in the absorption tower 4, and captures the carbon dioxide in the top gas to obtain purified gas. The purified gas flow rate is 56000-170000Nm 3 / h, check whether the gas content in the purified gas is: CO2: 0.5-2.7%; N2: 1.3-6.2%; CO: 0.6-3%. If it is not within this range, re-introduce the purified gas to the bottom of the absorption tower, close the top gas entering the decarbonization device, and overhaul the absorption tower again; if it is within this range, the alcohol amine rich liquid enters the next process, and the absorption tower overhaul is completed; The alcohol amine rich liquid discharged from the bottom of the absorption tower 4 enters the flash tank 8 for flash evaporation. The mixed gas of part of carbon dioxide and carbon monoxide flashed out enters the gas network 7 from the top of the flash tank 8. The gas components in the mixed gas are monitored by the gas sensor 1. If it is detected that the mixed gas contains gases other than carbon dioxide and carbon monoxide, the mixed gas is reintroduced into the flash evaporator 8, the top gas entering the decarbonization device is closed, and the flash evaporator 8 is overhauled again; if it is detected that the mixed gas contains only carbon dioxide and carbon monoxide, the mixed gas is introduced into the gas network 7, and the overhaul of the flash evaporator 8 is completed. The mixed gas is mixed with the purified gas at the gas network 7 to increase the calorific value of the purified gas from 4500-5000kJ / Nm 3 Reduced to 3000-3500 kJ / Nm 3, the alcoholamine rich liquid after flashing in the flash tank 8 is discharged from the bottom, and then enters the upper part of the regeneration tower 9 for partial analysis, and the generated gas is discharged from the top of the regeneration tower 9, and the partially analyzed alcoholamine solution is discharged from the upper part of the regeneration tower 9. The discharged alcoholamine solution enters the reboiler 10 for heating, and the alcoholamine solution temperature is heated from 50-60°C to 70-80°C. The heated alcoholamine solution returns to the lower part of the regeneration tower 9 for regeneration and analysis, and the generated analytical gas is discharged from the lower part of the regeneration tower 9. After the analyzed alcoholamine solution is inspected from the lower part of the regeneration tower 9, it is detected whether the carbon dioxide concentration in the alcoholamine solution discharged from the regeneration tower 9 is 21.3L / L, and the deviation value is ±2L. If it is not within this range, the alcoholamine solution is reintroduced into the regeneration tower 9, the top gas entering the decarbonization device is closed, and the regeneration tower 9 is overhauled again; if it is within this range, the alcoholamine solution returns to the top of the absorption tower 4 in S1, and the overhaul of the regeneration tower 9 is completed; The gas discharged from the upper and lower parts of the regeneration tower 9 enters the gas-liquid separator 11 for gas-liquid separation. The separated carbon dioxide gas is liquefied and stored. After the separated alcoholamine solution is inspected, it is detected whether the carbon dioxide concentration in the alcoholamine solution discharged from the gas-liquid separator 11 is 21.3L / L, and the deviation value is ±2L. If it is not within this range, the alcoholamine solution is reintroduced into the regeneration tower 9, the top gas entering the decarbonization device is closed, and the gas-liquid separator 11 is overhauled again; if it is within this range, the alcoholamine solution returns to the top of the absorption tower 4 in S1, and the overhaul of the gas-liquid separator 11 is completed.
[0018] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A device for heavy-load test of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarburization device, characterized in that: The invention comprises two gas sensors (1), two infrared spectrometers (2), a gas pipe 1 (5), a gas pipe 2 (6), a liquid pipe 1 (12) and a liquid pipe 2 (13); the blast furnace gas outlet of the blast furnace (3) is connected to the gas inlet of the absorption tower (4); the decarbonized coal gas outlet of the absorption tower (4) is connected to the gas pipe 1 (5); the gas pipe 1 (5) is connected to the gas network (7); the liquid outlet of the absorption tower (4) is connected to the liquid inlet of the flash tank (8); the carbon dioxide outlet of the flash tank (8) is connected to the gas pipe 2 (6); the gas pipe 2 (6) is connected to the gas network (7); each of the gas sensors (1) is connected to On the gas pipe 1 (5) and the gas pipe 2 (6), the liquid outlet of the flash tank (8) is connected to the liquid inlet of the upper part of the regeneration tower (9), the liquid outlet of the upper part of the regeneration tower (9) is connected to the liquid inlet of the reboiler (10), the liquid outlet of the reboiler (10) is connected to the liquid inlet of the lower part of the regeneration tower (9), the liquid outlet of the regeneration tower (10) is connected to the liquid pipe 1 (12), the gas outlet of the regeneration tower (10) is connected to the gas-liquid separator (11), the liquid outlet of the gas-liquid separator (11) is connected to the liquid pipe 2 (13), and each of the infrared spectrometers (2) is connected to the liquid pipe 1 (12) and the liquid pipe 2 (13).
2. A method for heavy-load commissioning of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarburization device, characterized in that: The following steps are involved: S1. 2500m 3 A conventional blast furnace replaces a large hydrogen-rich carbon circulating oxygen blast furnace. A portion of the furnace top gas generated directly enters the gas pipe network (7) through pressure regulation, and the other portion passes through a fine dust removal device and is pressurized by a compressor (14) before entering an absorption tower (4). The furnace top gas contacts an alcohol amine solution in the absorption tower (4) to capture carbon dioxide. The gas content ratio in the purified gas is detected by a gas sensor (1), thereby determining the maintenance status of the absorption tower. The purified gas after capture enters the gas pipe network (7) through a gas pipe 1 (5), and the alcohol amine rich liquid after capture enters a flash tank (8) from the bottom of the absorption tower (4); S2. The alcohol amine rich liquid in the flash tank (8) is flashed at reduced pressure to flash out a mixed gas of part of carbon dioxide and carbon monoxide. The gas components in the mixed gas are monitored by the gas sensor (1) to judge the maintenance status of the flash tank. The mixed gas enters the gas network (7) from the gas pipe 2 (6). The alcohol amine rich liquid after flashing enters the upper part of the regeneration tower (9) from the bottom of the flash tank (8); S3. The alcohol amine rich solution in the upper part of the regeneration tower (9) is regenerated and analyzed, and the generated gas is discharged from the top of the regeneration tower (9), and the regenerated alcohol amine solution enters the reboiler (10) from the upper part of the regeneration tower (9); S4. After the alcohol amine solution in the reboiler (10) is heated, it is returned to the lower part of the regeneration tower (9) in S3 for further regeneration and analysis. The generated analysis gas is discharged from the lower part of the regeneration tower (9). The analyzed alcohol amine solution is inspected by an infrared spectrometer (2) to determine the maintenance status of the reboiler (10) and the regeneration tower (9). The analyzed alcohol amine solution is returned to the top of the absorption tower (4) in S1; S5. The gas discharged from the upper and lower parts of the regeneration tower (9) enters the gas-liquid separator (11) for gas-liquid separation. The separated carbon dioxide gas is liquefied and stored. The separated alcoholamine solution is tested by an infrared spectrometer (2) to determine the maintenance status of the gas-liquid separator (11). The separated alcoholamine solution is returned to the top of the absorption tower (4) in S1.
3. The method for heavy-load commissioning of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarburization device according to claim 2 is characterized in that In step S1, the flow rate of the top gas after fine dust removal is 80000-250000Nm 3 / h, the gas content is: CO2: 18-24%; N2: 50-56%; CO: 21-27%. After being pressurized by the compressor (14), the gas pressure increases from 0.12MPa-0.2MPa to 1.2-1.7MPa. The purified gas flow rate after being captured by the alcohol amine solution is 56000-170000Nm 3 / h, calorific value is 4500-5000kJ / Nm 3 , detect whether the gas content in the purified gas is: CO2: 0.5-2.7%; N2: 1.3-6.2%; CO: 0.6-3%. If it is not within this range, the purified gas is reintroduced into the bottom of the absorption tower (4), the top gas entering the decarbonization device is closed, and the absorption tower (4) is overhauled again; if it is within this range, the alcohol amine rich liquid enters the flash tank (8), and the absorption tower (4) is overhauled.
4. The method for heavy-load commissioning of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarburization device according to claim 2 is characterized in that: In step S2, if it is detected that the mixed gas contains gas other than carbon dioxide and carbon monoxide, the mixed gas is reintroduced into the flash evaporator (8), the top gas entering the decarbonization device is shut off, and the flash evaporator (8) is overhauled again; if it is detected that the mixed gas contains only carbon dioxide and carbon monoxide, the mixed gas is introduced into the gas network (7), and the overhaul of the flash evaporator (8) is completed. The mixed gas entering the gas network (7) is mixed with the purified gas in step S1, and the calorific value of the purified gas is increased from 4500 to 5000 kJ / Nm 3 Reduced to 3000-3500 kJ / Nm 3 .
5. The method for heavy-load commissioning of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarburization device according to claim 2 is characterized in that: In step S4, the temperature of the alcohol amine solution discharged from the upper part of the regeneration tower (9) is 50-60°C, and the temperature is 70-80°C after being heated in the reboiler (10).
6. The method for heavy-load commissioning of a large-scale hydrogen-rich carbon cycle oxygen blast furnace decarburization device according to claim 2 is characterized in that In steps S3 to S5, the amine solution discharged from the regeneration tower (9) and the gas-liquid separator (11) is detected by an infrared spectrometer to detect whether the carbon dioxide concentration in the amine solution is 21.3 L / L, and the deviation value is ±2 L. If it is not within this range, the amine solution is reintroduced into the regeneration tower (9) and the gas-liquid separator (11), the top gas entering the decarbonization device is closed, and the reboiler (10), the regeneration tower (9) and the gas-liquid separator (11) are overhauled again; if it is within this range, the amine solution returns to the top of the absorption tower in S1, and the overhaul of the reboiler (10), the regeneration tower (9) and the gas-liquid separator (11) is completed.