Low-rank coal high-temperature pyrolysis process combined with iron and steel industry

Abstract

The invention belongs to the technical field of coal chemical industry, and particularly relates to a low-rank coal high-temperature pyrolysis process combined with iron and steel industry. The process comprises the following steps: (1) low-rank coal is used as a raw material, and the low-rank coal enters a rotary furnace after being dried; (2) blast furnace gas generated by a blast furnace servesas a fuel, and the blast furnace gas is conveyed into the rotary furnace after being heated to 1050 DEG C or above through a heat-storage-type hot gas furnace; (3) the dried low-rank coal is gradually heated to 1000+/-50 DEG C under the action of the heated blast furnace gas to complete a high-temperature pyrolysis process in the rotary furnace; and (4) the low-rank coal subjected to the high-temperature pyrolysis is fed into a cooling barrel to be cooled to 120 DEG C or below, discharging is carried out, and the product can be used as sintering solid fuel of sintering process in the steel industry. According to the process, water pollution is not generated, the heating time is short, and energy consumption is low; moreover, combustion performance of the solid product is close to combustion performance of coke and can be directly used for sintering production, and water pollution is not generated in the production process; and in addition, separated and classified utilization of low-rank coal and combination of chemical energy are realized, and integrated co-production is realized in the production process.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a low-rank coal high-temperature pyrolysis process combined with the iron and steel industry. Background technique [0002] A large amount of blast furnace gas is produced during blast furnace production in iron and steel enterprises. The blast furnace hot blast stove itself uses 40% of the blast furnace gas. Gas-fired boilers built to generate steam for steam turbines to generate electricity. [0003] Sintering production is one of the important process units of modern steel production. The sintering process requires solid fuel with high active ingredients, low ash content, low volatile matter, and the content of impurities such as S and N in coal should be minimized. The solid fuels currently used for sintering are: coke powder and anthracite. Among them, the use of coke powder as fuel has the following problems: coke production needs to consume hig...

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Problems solved by technology

Among them, the use of coke powder as fuel has the following problems: coke production needs to consume high-quality coking coal, the coke production process has high temperature, long time, and high energy consumption, and coking produces waste water with high concentration of harmful substances in the process of coking, gas purification, and chemical product recovery. , the cost of coke powder is higher than that of anthracite

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