Device for improving decarburization effect of hydrogen-rich carbon circulation oxygen blast furnace gas regeneration tower

Abstract

The utility model discloses a device for improving the decarburization effect of a hydrogen-rich carbon circulation oxygen blast furnace gas regeneration tower, which comprises an absorption tower with the lower part connected with a feed gas inlet pipe, the absorption tower is connected with a flash tank, a bottom rich liquid pipe of the flash tank is communicated with the upper part of the regeneration tower, and the middle part of the regeneration tower is connected with a nitrogen pipe. A purging opening of the regeneration tower is connected with a steam pipe; the nitrogen pressure of the nitrogen pipe is controlled to range from 0.6 MPa to 0.8 MPa, the nitrogen pressure of the nitrogen pipe is DN250, the steam pressure of the steam pipe is controlled to range from 0.4 MPa to 0.6 MPa, and the steam pressure of the steam pipe is DN400.

Description

Technical Field

[0001] The utility model relates to a device for improving the decarbonization effect of a hydrogen-rich carbon circulating oxygen blast furnace gas regeneration tower. Background Art

[0002] The hydrogen-rich carbon circulating oxygen blast furnace (HyCROF) is a smelting process that uses oxygen blast to replace traditional heated air blast. The coal gas of the hydrogen-rich carbon circulating oxygen blast furnace contains 28%-32% of CO2 acidic gas. Removing CO2 from the coal gas can increase its calorific value. The removal of CO2 adopts the amine method. In the existing technology, the CO2 content of the purified gas is designed to be less than 3%, and the actual average is 3.45%. During operation, the CO2 content of the purified gas fluctuates between 3% and 10%. When the CO2 content is high, it is difficult for the CO2 content in the purified gas to reach the standard of not more than 3%. Summary of the invention

[0003] The purpose of the utility model is to provide a device for improving the decarbonization effect of the hydrogen-rich carbon circulating oxygen blast furnace gas regeneration tower, which can greatly improve the efficiency of the CO2 regeneration process and greatly reduce the energy consumption of the current hydrogen-rich carbon circulating oxygen blast furnace gas carbon dioxide capture process.

[0004] The technical solution adopted by the utility model is a device for improving the decarbonization effect of a hydrogen-rich carbon circulating oxygen blast furnace gas regeneration tower, comprising an absorption tower connected to a raw gas inlet pipe at the bottom, the absorption tower is connected to a flash tank, a bottom rich liquid pipe of the flash tank is connected to the upper part of the regeneration tower, a nitrogen pipe is connected to the middle of the regeneration tower, and a purge port of the regeneration tower is connected to a steam pipe; the nitrogen pressure of the nitrogen pipe is controlled at 0.6-0.8MPa, the nitrogen pipe is DN250, and the steam pressure of the steam pipe is controlled at 0.4-0.6MPa, and the steam pipe is DN400.

[0005] The raw gas of the top gas of the hydrogen-rich carbon cycle oxygen blast furnace adopts an absorption tower that enters from the bottom, and contacts with the MDEA alcohol amine solution from top to bottom in the tower body, so as to capture most of the CO2 in the hydrogen-rich carbon cycle oxygen blast furnace gas, enter the alcohol amine solution, absorb the CO2 acid gas lean liquid in the absorption tower, and become rich liquid, enter the flash tank for flash evaporation, and the rich liquid after flash evaporation is from the alcohol amine rich liquid at the bottom of the flash tank to the regeneration tower, and the regeneration of CO2 gas is completed in the regeneration tower. When the alcohol amine rich liquid enters the regeneration tower, high-pressure nitrogen is input through the nitrogen pipe, or steam is input through the steam pipe, and the alcohol amine rich liquid contacts with the nitrogen from bottom to top in countercurrent, and the nitrogen strips out the CO2 in the amine liquid. It is further necessary to reduce the pressure of the top of the regeneration tower, and further introduce steam, and the alcohol amine rich liquid contacts with the hot steam from bottom to top in countercurrent, and the hot steam heats the amine liquid and strips out the CO2 in the amine liquid. The CO2 coming out of the top of the stripping regeneration tower is cooled by the acid gas cooler and then enters the acid gas reflux tank. The separated reflux liquid returns to the top of the stripping regeneration tower. The amine liquid coming out of the lower part of the stripping regeneration tower enters the reboiler to further desorb the dissolved CO2, and the lean liquid completes the regeneration operation. The hot lean liquid out of the reboiler is recovered by the lean-rich liquid heat exchanger, the impurities are removed by the filtration system, and the lean liquid cooler is cooled to an appropriate temperature, and then it is pressurized and sent to the absorption tower by the solution circulation pump, thereby completing the circulation of the alcohol amine solution.

[0006] The high-pressure nitrogen input into the flash tank by the nitrogen pipe of the regeneration tower is controlled at 0.6-0.8MPa. The nitrogen pipe is DN250 and is introduced from the solution between the two sections of the packing of the regeneration tower. A flow meter, a pressure transmitter, a flow regulating valve, a check valve, and a manual stop valve are also configured.

[0007] The steam pipe is connected to the hole on the pipeline in front of the steam temperature and pressure reducing valve. The steam pressure is controlled at 0.4-0.6MPa. The steam pipe is DN400 and enters from the purge port of the regeneration tower. It is also equipped with a flow meter, thermocouple, pressure transmitter, steam flow regulating valve, check valve, and front and rear manual stop valves.

[0008] Through the optimization and improvement of the above equipment, the method of gradually increasing the flow rate of nitrogen is adopted to obtain the increment of gas lift nitrogen. The CO2 in the decarbonized coal gas is reduced to 1% through an improved device for improving the gas lift decarbonization effect of the hydrogen-rich carbon circulating oxygen blast furnace regeneration tower. After being sprayed into the blast furnace, the high CO2 content in the coal gas reacts with coke and consumes coke. The bottleneck disadvantage is eliminated. At the same time, the decarbonization efficiency of the decarbonization system is further improved, thereby achieving the purpose of improving CO2 removal. It has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the connection structure of the utility model. DETAILED DESCRIPTION

[0010] The following is combined with Figure 1The present invention will be described in detail with reference to the accompanying drawings and examples.

[0011] A device for improving the decarbonization effect of a hydrogen-rich carbon circulating oxygen blast furnace gas regeneration tower, such as Figure 1 As shown, it includes an absorption tower 2 whose lower part is connected to a raw gas inlet pipe 1, the absorption tower 2 is connected to a flash tank 3, a bottom rich liquid pipe 4 of the flash tank 3 is connected to the upper part of a regeneration tower 6, a nitrogen pipe 5 is connected to the middle of the regeneration tower 6, and a purge port of the regeneration tower 6 is connected to a steam pipe 7; the nitrogen pressure of the nitrogen pipe 5 is controlled at 0.6-0.8MPa, the nitrogen pipe is DN250, and the steam pressure of the steam pipe 7 is controlled at 0.4-0.6MPa, and the steam pipe is DN400.

[0012] The raw gas is hydrogen-rich carbon cycle oxygen blast furnace top gas, the solution used in the absorption tower is a 30-60% by mass methyldiethanolamine aqueous solution, with a 5% by mass activator added, the absorption temperature is 40°C, the absorption pressure is 1.5-1.7Mpa, the regeneration tower pressure is 60-20kPa, the reboiler solution temperature is 78-76°C, the lean liquid or semi-lean liquid operating temperature of the regeneration tower is 80°C, the gas nitrogen flow rate is 5000Nm³ / h-20000 Nm³ / h, and the heating steam flow rate is 3-8t / h.

[0013] When the rich alcoholamine liquid enters the regeneration tower, high-pressure nitrogen is input through the nitrogen pipe of the nitrogen system, or steam is input through the steam pipe of the steam system. The rich alcoholamine liquid contacts the nitrogen from bottom to top in countercurrent, and the nitrogen strips out the CO2 in the amine liquid. It is necessary to further reduce the pressure at the top of the regeneration tower, and further introduce steam. The rich alcoholamine liquid contacts the hot steam from bottom to top in countercurrent, and the hot steam heats the amine liquid and strips out the CO2 in the amine liquid. The CO2 coming out of the top of the stripping regeneration tower is cooled by the acid gas cooler and enters the acid gas reflux tank. The separated reflux liquid returns to the top of the stripping regeneration tower. The amine liquid coming out of the lower part of the stripping regeneration tower enters the reboiler to further desorb the dissolved CO2, and the lean liquid completes the regeneration operation. The hot lean liquid out of the reboiler recovers heat through the lean-rich liquid heat exchanger, removes impurities through the filtration system, and is cooled to an appropriate temperature through the lean liquid cooler, and then is pressurized and sent to the absorption tower through the solution circulation pump, thereby completing the circulation of the alcoholamine solution.

[0014] The high-pressure nitrogen input into the flash tank by the nitrogen pipe of the regeneration tower is controlled at 0.6-0.8MPa. The nitrogen pipe is DN250 and is introduced from the solution between the two sections of the packing of the regeneration tower. A flow meter, a pressure transmitter, a flow regulating valve, a check valve, and a manual stop valve are also configured.

[0015] The steam pipe is connected to the hole on the pipeline in front of the steam temperature and pressure reducing valve. The steam pressure is controlled at 0.4-0.6MPa. The steam pipe is DN400 and enters from the purge port of the regeneration tower. It is also equipped with a flow meter, thermocouple, pressure transmitter, steam flow regulating valve, check valve, and front and rear manual stop valves.

Claims

1. A device for improving the decarburization effect of a hydrogen-rich carbon circulating oxygen blast furnace gas regeneration tower, comprising an absorption tower connected to a raw gas inlet pipe at the bottom, the absorption tower connected to a flash tank, and a bottom rich liquid pipe of the flash tank connected to the upper part of the regeneration tower, characterized in that: The middle of the regeneration tower is connected to a nitrogen pipe, and the purge port of the regeneration tower is connected to a steam pipe; the nitrogen pressure of the nitrogen pipe is controlled at 0.6-0.8MPa, the nitrogen pipe is DN250, and the steam pressure of the steam pipe is controlled at 0.4-0.6MPa, and the steam pipe is DN400.

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