Heat compensation method in coal gas blowing smelting process

Abstract

The invention discloses a heat compensation method in a coal gas blowing smelting process. The method comprises the following steps that (1), after being pressurized to be at least 100 kPa higher thanhot air pressure by a pressurizing machine, coke oven gas is conveyed to a blast furnace through a pipeline; (2), in a blast furnace tuyere zone, the coke oven gas in the pipeline in the step (1) issprayed into the blast furnace through a spray gun, and the coke oven gas and pulverized coal together participate in a reaction in the furnace; and (3) the oxygen supply amount is increased through an oxygen enrichment pipeline in a blast furnace tuyere rotary zone, so that the oxygen excess coefficient n is increased, the combustion of a combustion zone is enhanced, and then the temperature of the zone is increased. According to the method, the problems that the temperature of the rotary zone is decreased, so that the temperature of molten iron, the heat supply of a furnace cylinder and thelike are changed, effective blowing of the coke oven gas is not facilitated, and working of the blast furnace during smelting is affected are effectively solved.

Description

technical field [0001] The invention relates to the technical field of gas injection smelting, in particular to a heat compensation method in the process of gas injection smelting. Background technique [0002] At present, in coal-injected blast furnaces, with the gradual increase of coke oven gas injection, the temperature in the tuyere swirl zone of the blast furnace is on a downward trend, and the resulting changes will inevitably change the temperature of molten iron and the heat supply of the hearth, which is not conducive to The effective injection of coke oven gas has a greater impact on the blast furnace smelting conditions. Contents of the invention [0003] Aiming at the above technical problems, the present invention provides a thermal compensation method in the process of gas injection smelting, which can effectively solve the temperature drop in the swirl zone, which causes changes in the temperature of molten iron and the heat supply of the hearth, which is n...

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Problems solved by technology

[0003] Aiming at the above technical problems, the present invention provides a thermal compensation method in the process of gas injection smelting, which can effectively solve the temperature drop in the swirl zone, which causes changes in the temperature of molten iron and the heat supply of the hearth, which is not conducive to the effective coke oven gas. Injection, the problem that affects the blast furnace smelting condition

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