Vertical flue structure of coke oven combustion chamber for achieving low nitrogen oxide combustion

Abstract

The invention relates to a vertical flue structure of a coke oven combustion chamber for achieving low nitrogen oxide combustion. The elevation of a bottom outlet of a low-grade gas is higher than that of the bottom outlet of combustion-supporting air; the elevation of the bottom outlet of the combustion-supporting air is lower than that of a bottom surface of a waste gas circulation hole or consistent with that of the waste gas circulation hole; various combustion-supporting air outlets in multiple segments of combustion-supporting air outlets are different from various low-grade gas outlets in multiple segments of low-grade gas outlets in elevation and the elevation of the final combustion-supporting air outlet is greater than that of final low-grade gas outlet; the amount of the gas supplied from the final low-grade gas outlet is 1-50% of the gross of the supplied gas; and the amount of the combustion-supporting air supplied from the final combustion-supporting air outlet is 1-50% of the gross of the supplied combustion-supporting air. Multiple mild and deep low nitrogen oxide combustion modes of low-oxygen dilution combustion, rich and lean combustion, staged combustion of fuel and air-staged combustion are achieved, generation of NOx in the combustion process of a vertical flue is effectively inhibited and higher environmental protection requirements are met.

Description

technical field [0001] The invention relates to the technical field of coke ovens, in particular to a coke oven combustion chamber vertical flue structure capable of realizing low nitrogen oxide combustion. Background technique [0002] The uppermost part of the modern coke oven body is the furnace roof, and below the furnace roof are the combustion chambers and carbonization chambers arranged alternately. The lower part of the furnace body has a regenerator and a ramp area connecting the regenerator and the combustion chamber. Each regenerator The small flue in the lower part is connected with the flue through an exchange switch. The flue is arranged in the coke oven foundation or on both sides of the foundation, and the end of the flue leads to the chimney. Therefore, the coke oven is composed of three chambers and two regions, namely carbonization chamber, combustion chamber, regenerator, chute area, furnace top area, and basic part. The combustion chamber is on both si...

AI Technical Summary

Problems solved by technology

At present, in order to improve the uniformity of heating in the vertical direction in the vertical flue and meet the production load requirements, the existing down-sprayed coke ovens in my country have adopted methods such as high and low lamp caps, exhaust gas circulation, and sectional supply of combustion-supporting gas, but the nitrogen oxides in the combustion process are suppressed. There is still room for improvement in generation

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