A vertical flue structure of a coke oven combustion chamber

Abstract

The invention relates to a coke oven combustor vertical flue structure. A coke oven combustor is composed of a plurality of vertical flues. Every two vertical flues form a duplex vertical flue, the bottoms of the duplex vertical flues are communicated through exhaust gas circulation holes, and the bottom of each vertical flue is provided with a low-grade gas outlet and a combustion air outlet; the low-grade gas outlets and the combustion air outlets at the bottoms of the vertical flues are not consistent in elevation, and the elevation of the low-grade gas outlets is 50-500 mm larger than that of the combustion air outlets; the elevation of the combustion air outlets is smaller than that of the bottom faces of the exhaust gas circulation holes or consistent with the elevation of the bottom faces of the exhaust gas circulation holes. When preheated combustion air enters the vertical flues, the combustion air is mixed with exhaust gas, the concentration of oxygen in the combustion air is lowered, then, the mixed gas is sprayed upwards to make contact with low-grade gas to be combusted, mild and deep hypoxia dilution combustion is formed, and therefore the generation amount of NOx is decreased.

Description

technical field [0001] The invention relates to the technical field of coke ovens, in particular to a vertical flue structure of a coke oven combustion chamber. 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 sides of the carbonization chamber and consists ...

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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