Spray gun, spray gun control method and lime kiln with spray gun

Abstract

The invention discloses a spray gun, a spray gun control method and a lime kiln with the spray gun. A fixed partition plate arranged in the spray gun divides a vertical pipe of the spray gun into a thin fuel area and a thick fuel area. When the pulverized coal passes through the bent pipe, the pulverized coal concentration in the rich fuel area is high and the pulverized coal concentration in thelight fuel area is low because of the inertia effect; the telescopic positions of the sliding partition plate and the sliding sleeve are adjusted, the fuel pulverized coal concentration difference between the thin fuel area and the thick fuel area is adjusted; a primary combustion area with low pulverized coal concentration and a secondary combustion area with high pulverized coal concentration are naturally formed at an outlet of a spray gun in the lime kiln so that NOx formed by combustion in the primary combustion area can be better reduced into N2 in the secondary combustion area, and thecontent of NOx in the lime production process is reduced.

Description

technical field [0001] The application relates to the technical field of lime kilns, and in particular, to a spray gun, a spray gun control method and a lime kiln with a spray gun. Background technique [0002] Usually we call lime refers to quicklime (CaO), which is an important auxiliary raw material widely used in the metallurgical industry. In the sintering of iron-making raw materials, iron-making reduction process, molten iron pretreatment process and out-of-furnace refining process, lime is used as an additive. It plays the role of adjusting the basicity of the charge, slagging and desulfurization. It can be seen that lime plays an important role in the smooth progress of the iron and steelmaking process. [0003] The lime kiln is the core equipment in the lime production process. The raw limestone is heated to 1100 ℃ in the lime kiln, and then calcined to produce the product lime. In the production process of lime kiln, fuels such as pulverized coal and gas need to ...

AI Technical Summary

Problems solved by technology

[0004] However, since the calcination temperature of the material is as high as 1100°C, the kiln chamber temperature in the calcination section of the lime kiln generally needs to reach 1300°C. In this high-temperature environment, fuel combustion will generate a large amount of NOx (nitrogen oxides), resulting in NOx is very high, which is not conducive to the environmental performance of the equipment

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