Gas Injection Control System For Blast Furnace, And Control Method

A system for controlling gas injection in a blast furnace, comprising:

• a coke oven gas pipeline, a decarbonized gas pipeline, a protection nitrogen pipeline, and a main gas pipeline, wherein:
• the coke oven gas pipeline and the decarbonized gas pipeline are connected with the main gas pipeline, distributing branch pipelines of main gas pipeline are located at nozzles of tuyeres of blast furnace, the protection nitrogen pipeline is connected to the main gas pipeline, a group of measuring components are used for each of the pipelines to detect operation status thereof, and the system automatically interlocks a valve group based on feedback information from detection points to control an operation status of the pipelines to ensure safe and reliable operation of a system for injecting gas;
• the coke oven gas pipeline is connected to a purifying and pressurizing system for coke oven gas, the gas is introduced into the a purifying and pressurizing system to be supplied to the main gas pipeline by a compressor in the purifying and pressurizing system, a pressure control valve PV2101, a flow control valve FV2101, and a shut-off valve ZV2101 are sequentially provided on the coke oven gas pipeline connected to the main gas pipeline;
• a temperature measuring component TE-0001, a flow measuring component FT-0001, and a pressure measuring component PT-0001 are installed on the coke oven gas pipeline in front of the purifying and pressurizing system for coke oven gas, and the coke oven gas enters the compressor for coke oven gas to be compressed at a pressure above 0.7 MPa, after being purified by an adsorption tower to remove tar, benzene, naphthalene, and other impurities;
• a pressure measuring component PT-2102 is installed on a pipeline in front of the pressure control valve PV2101, and a temperature measuring component TE-2101, a flow measuring component FT-2101, and a pressure measuring component PT-2101 are installed on a pipeline between the pressure control valve PV2101 and the flow control valve FV2101;
• the decarbonized gas with a pressure higher than 0.7 MPa is introduced into the system, and a pressure control valve PV2201, a flow control valve FV2201, and a shut-off valve ZV2201 are sequentially installed on a pipeline connected to the main gas pipeline;
• and
• a pressure measuring component PT-2202 is installed on the decarbonized gas pipeline at front of the pressure control valve PV2201, and a temperature measuring component TE-2201, a flow measuring component FT-2201, and a pressure measuring component PT-2201 are installed between the pressure control valve PV2201 and the flow control valve FV2201.