Blast furnace coal injection method by using blast furnace gas as coal injection delivery carrier

Abstract

The invention discloses a blast furnace coal injection method by using blast furnace gas as a coal injection delivery carrier, which comprises the following steps: blast furnace gas uses as a coal powder injection carrier is dehydrated and sent into a gas compression pump to be compressed; the blast furnace gas compressed by the gas compression pump injects the coal powder in the injection tank into a coal powder distributor; and the blast furnace gas and coal powder which are distributed to various tuyeres of the blast furnace by the coal powder distributor are injected into the blast furnace through a coal powder gun. The blast furnace gas enters the blast furnace to participate into the chemical reaction as the coal powder carrier so as to reduce iron ores, thereby performing the function of lowering the coke ratio; the blast furnace gas participates into the reaction in the furnace, so that the flue gas amount of the blast furnace is reduced, and the nitrogen content is lowered, thereby being beneficial to enhancing the heat value of the furnace top gas; and besides, the blast furnace gas is used as the coal powder injection carrier, thereby enhancing the utilization ratio of the blast furnace gas, reducing the dispersion of the blast furnace gas, and being beneficial to energy saving, emission reduction and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of iron and steel industry, and relates to a blast furnace coal injection method using blast furnace gas as a coal injection transport carrier. Background technique [0002] Blast furnace pulverized coal injection is a major technical measure for blast furnace ironmaking to save coke resources, reduce coke ratio and production cost, and is also a major technological revolution in modern blast furnace smelting. my country is one of the earliest countries to develop coal injection technology. Especially in the past ten years, the price of coke has been soaring. The injection of pulverized coal can significantly reduce production costs, and blast furnace coal injection technology has been greatly developed and applied. [0003] As the blast furnace coal injection is the key technology to change the energy structure of the blast furnace, it is an effective energy-saving measure. Substituting coal for coke in th...

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Problems solved by technology

[0004] The existing blast furnace coal injection mainly uses nitrogen or compressed air as the pulverized coal delivery medium. Although the safety is better, the nitrogen used as the pulverized coal delivery medium does not participate in the blast furnace reaction after entering the blast furnace, which reduces the quality of the blast furnace gas and absorbs the blast furnace gas. The precious heat inside limits the improvement of blast furnace ironmaking efficiency

[0005] At present, all iron and steel enterprises have the problem of blast furnace gas emission, which not only pollutes the environment, but also wastes resources

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