Blast furnace coal injection method adopting coke oven coal gas as coal injection conveying carrier

A technology of coke oven gas and blast furnace coal injection, which is applied in the iron and steel industry, can solve the problems of reducing the quality of blast furnace gas and limiting the improvement of blast furnace ironmaking efficiency, and achieve the effects of increasing combustion temperature, reducing coke ratio, and reducing carbon emissions

Inactive Publication Date: 2013-02-20
WISDRI ENG & RES INC LTD
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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

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  • Blast furnace coal injection method adopting coke oven coal gas as coal injection conveying carrier

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] The method of the present invention is based on the system utilizing coke oven gas as the pulverized coal delivery carrier, such as figure 1 As shown, the system includes a dehydration device 2, a coke oven gas compressor 3, an injection tank 7, an air replenisher 10, a pulverized coal distributor 12 and a spray gun 16 connected by pipelines, a coke oven gas compressor 3 and an air replenisher The pipeline between 10 is provided with an air supply regulating valve 5 and an air supply valve 6; the injection tank 7 is connected with two coal injection valves 8 and 9 connected in series, betwee...

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Abstract

The present invention discloses a blast furnace coal injection method adopting a coke oven coal gas as a coal injection conveying carrier. The method comprises the following steps that: coke oven coal gas adopted as a coal powder injection carrier is subjected to a dehydration treatment, and then is conveyed to a coal gas compressor to carry out pressurization; with the coke oven coal gas pressurized by the coal gas compressor, coal powder in an injection tank is injected to a coal powder distributor; and the coke oven coal gas and the coal powder distributed to various air ports of a blast furnace through the coal powder distributor are injected into the blast furnace through a coal powder jet injector. According to the present invention, the coke oven coal gas enters the blast furnace to participate in the chemical reaction so as to reduce iron ore and provide a coke ratio reduction effect; hydrogen in the coke oven coal gas is changed into water vapor after the reaction, such that no environmental pollution is generated, and carbon emission is reduced; nitrogen content in the coke oven coal gas is low, such that a heat value of the blast furnace coal gas after the reaction is increased; and the coke oven coal gas is mainly subjected to a heat emission reaction in the blast furnace, such that theoretical combustion temperature increase and coal injection increase are easily achieved.

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 coke oven 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 the bl...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 王小伟范小刚汤楚雄唐恩李啸磊肖承斌李菊艳
Owner WISDRI ENG & RES INC LTD
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