Method for realizing low nitrogen combustion in vertical flue of coke oven combustion chamber

Abstract

The invention relates to a method for realizing low nitrogen combustion in a vertical flue of a coke oven combustion chamber. Preheated combustion supporting air enters the vertical flue from an combustion supporting air bottom outlet, then is mixed with exhaust gas, and then jets upward to be in contact combustion with lean gas / mixed gas erupted from a rich gas outlet or lean gas bottom outlet to form mild and deep hypoxic dilution combustion; along the height direction of the vertical flue, each section of combustion supporting air outlets and gas outlets are arranged in a staggered mode, so that there is always excessive combustion supporting air to react with low-concentration gas or excessive gas to react with oxygen-lean combustion supporting air in the combustion process to form a concentration deviation combustion process; the gas flow of each outlet is controlled by a flow adjusting device, and the last section of the combustion supporting air outlets is arranged higher than the last section of the gas outlets, so that there is a high temperature reduction area in the vertical flue, and in the high temperature reduction area, there is residual reduction gas capable of reducing generated NOx in high temperature exhaust gas. The method can effectively reduce the NOx concentration in the exhaust gas.

Description

technical field [0001] The invention relates to the technical field of coking, in particular to a method capable of realizing low-nitrogen combustion in a flue 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 c...

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