Coke oven heating method capable of lowering concentration of nitrogen oxides in waste gas

Abstract

The invention relates to a coke oven heating method capable of reducing the concentration of nitrogen oxides in waste gas. A waste gas main pipe A and a waste gas main pipe B are respectively buried at the bottom of both sides of a small flue of the coke oven. The flue is connected, and the other end is respectively connected to the small coke oven flue with different airflow directions through the cleaning hole; At the same time, the small flue of the coke oven changes from downdraft to updraft; at this time, the high-temperature exhaust gas extracted from the main flue of the coke oven enters the updraft corresponding to the small flue of the coke oven through the exhaust gas main pipe B and the cleaning hole. The present invention can reduce the combustion intensity of coal gas and achieve the purpose of reducing the nitrogen oxide content in the coke oven exhaust gas by extracting the flue waste gas in the coke oven main flue and mixing it into the rising airflow heated by the coke oven; The device has the advantages of simple structure, low investment, convenient adjustment and automatic control.

Description

technical field [0001] The invention relates to the technical field of coke oven environmental protection, in particular to a coke oven heating method capable of reducing the concentration of nitrogen oxides in exhaust gas. Background technique [0002] During the production process of coke oven, the combustion of gas and air in the coke oven combustion chamber will produce nitrogen oxides (NO X ). These nitrogen oxide-containing waste gases will be directly discharged into the atmosphere through the coke oven chimney, and the nitrogen oxides in the atmosphere will destroy the ozone layer, cause acid rain, and pollute the environment. As my country pays more and more attention to environmental issues, the emission standards of nitrogen oxides in coke oven exhaust gas have also been more strictly stipulated, but at present, the concentration of nitrogen oxides emitted by most coke ovens exceeds the standard. [0003] At present, there are two main coke oven heating technolo...

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Problems solved by technology

[0003] At present, there are two main coke oven heating technologies that can reduce the concentration of nitrogen oxides. One is to optimize the design of coke oven structure based on exhaust gas circulation and segmental heating. Although this method can greatly reduce nitrogen oxides in coke oven exhaust gas The concentration of nitrogen oxides in coke oven exhaust gas cannot meet the current national emission standards for nitrogen oxides in coke oven exhaust gas; the second is to perform denitrification treatment on exhausted coke oven exhaust gas. The concentration of the substance, but its biggest disadvantage is the huge investment in the treatment device, which occupies a large area and high operating costs, which directly limit the popularization and application of this technology.

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