Oxygen and coal powder blowing device of pure-oxygen smelting reduction furnace

Abstract

The invention discloses an oxygen and coal powder blowing device of a pure-oxygen smelting reduction furnace, comprising a tuyere small sleeve (1), a tuyere large sleeve (2), a coal powder connecting pipe (3), an oxygen connecting pipe (4) and a large sleeve flange (5). The tuyere large sleeve (2) is in necking connection with the tuyere small sleeve (1), an oxygen channel (9) and a coal powder channel (8) in the tuyere small sleeve (1) are respectively in threaded sealed connection with the oxygen connecting pipe (4) and the coal powder connecting pipe (3) in the tuyere large sleeve (2), outlets of the oxygen channel (9) and the coal powder channel (8) are arranged in a mixed channel (10) at the front part of the tuyere small sleeve (1), and the intersection point of axes of the oxygen channel (9) and the coal powder channel (8) is arranged outside the tuyere small sleeve (1). The oxygen and the coal powder enter the tuyere small sleeve from different channels which are intersected in the mixed channel with a closed end at the front end of the tuyere small sleeve, and the oxygen and the coal powder start to contact and be mixed in the mixed channel so that the combustion rates of the coal powder and the oxygen are improved.

Description

technical field [0001] The invention relates to an injection device for injecting oxygen and coal powder into a tuyere of a pure oxygen smelting reduction furnace, in particular to an oxygen and coal powder injection device for a reduction furnace in pure oxygen non-blast furnace ironmaking. Background technique [0002] In the traditional blast furnace coal injection process, the spray gun is directly inserted into the direct blast pipe of the blast furnace, and the mixing of pulverized coal and hot air is realized in the small channel of the tuyere. The traditional process uses hot air as a combustion-supporting medium. The amount of hot air is relatively large, the inner diameter of the straight blow pipe is relatively large, and the spray gun is directly inserted into the straight blow pipe. In the pure oxygen smelting process, pure oxygen is used as a combustion-supporting medium. Since the amount of oxygen is less than that of hot air, the existing oxygen port channel ...

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Problems solved by technology

[0004] (1) The pulverized coal flow ejected by the direct-flow coaxial oxygen coal gun has a large axial velocity, a small radial velocity, and no tangential velocity, so the pulverized coal particles cannot rotate, so that the pulverized coal cannot be dispersed. , the mixing with hot air and oxygen is insufficient, and there is a pulverized coal concentration core in the center of the flame, which leads to inefficient combustion of pulverized coal and a low combustion rate, which limits the increase in the amount of coal injection

[0005] (2) Coaxial single-rotation oxygen coal gun (oxygen rotation, going to the outer layer, coal is direct current, going to the inner pipe), due to the strong effect of the outer layer rotating jet and the central direct jet, the degree of dispersion of the pulverized coal flow is improved, But because the oxygen is a swirling flow, the pulverized coal is a direct flow, and the mass of the gas is less than that of the solid pulverized coal, so the mixing of coal and oxygen is not the most sufficient

[0006] (3) The method of mixing pulverized coal and oxygen in the spray gun head is adopted. Although the mixing effect is improved, because the outer layer of the coal injection pipe in the center layer is an oxygen channel and is not directly water-cooled, facing the ultra-high combustion temperature in the furnace, the front end of the coal pipe easy to burn out

Existing oxygen-coal spray guns have the problems of uneven mixing of oxygen-coal and burning of the spray guns

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