Circulating structure and method for exhaust gas of coke oven

Abstract

The invention relates to a circulating structure and method for exhaust gas of a coke oven. The circulating structure comprises a main exhaust gas pipe, a connecting pipe, an automatic flow controller, a basement horizontally-arranged pipe, a lower jet pipe and brick exhaust gas channels which are successively connected, wherein the main exhaust gas pipe is connected with an exhaust gas source via an external variable-frequency fan, the basement horizontally-arranged pipe is horizontally arranged along the coke oven, the upper part of the basement horizontally-arranged pipe is provided with the lower jet pipe which is connected with the brick exhaust gas channels built in the wall of each heat storage chamber, and brick exhaust gas channel outlets located at the top of the brick exhaust gas channels are arranged in a vertical flue of a combustion chamber. The circulating structure and method are applied to a compound heating coke oven using lean gas for heating and can increase the circulation volume of exhaust gas, reduce the discharging amount of NOX in coke oven flue gas and improve uniformity of high heating of the vertical flue; and the circulating structure is simple in structure and convenient and accurate to adjust, can be in automatic control, and is beneficial for improving an operation environment, mitigating labor intensity and improving work efficiency and security.

Description

technical field [0001] The invention relates to the technical field of coke oven exhaust gas circulation, in particular to a coke oven exhaust gas circulation structure and method. Background technique [0002] At present, the working principle of the exhaust gas circulation adopted by the coke oven is to suck the exhaust gas of the downdraft from the circulation hole into the updraft fire channel under the action of the jet force of the updraft, so as to reduce the concentration of combustible components and oxygen in the air, and increase the airflow velocity , lengthen the flame, which is conducive to the uniform maturation of coke cakes up and down, and improves the quality of coke. This method is also a common method used by many coking design units to improve the uniformity of heating in the high direction of the coke oven. However, in the existing exhaust gas circulation structure, the exhaust gas circulation volume cannot be precisely controlled, and depends on the ...

AI Technical Summary

Problems solved by technology

However, as coke ovens are becoming large-scale today, the combustion chamber is getting higher and higher. Limited by the existing exhaust gas circulation structure, the circulation volume of exhaust gas cannot fully meet the requirements of coke oven heating uniformity in the high direction, so it is not conducive to reducing the exhaust gas. NO X generation

[0004] At the same time, for many iron and steel enterprises, the coke ovens basically use reheating coke ovens. In normal production, only lean gas is basically used for coking, and the rich gas supply pipeline system is generally only used in the initial stage of production. , after which it was basically in an idle state, causing great waste

[0005] figure 1 and figure 2 It is a schematic diagram of the furnace body structure using a conventional exhaust gas circulation system. In the figure, the exhaust gas of the descending flue passes through the circulation hole I and enters the ascending air flue to realize the exhaust gas circulation. As mentioned above, this structure cannot accurately control the circulation of the exhaust gas. control, and the circulating gas volume mainly depends on the air jet force of the ascending channel

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