Method and system for treating ammonia-containing tail gas and simultaneously reducing nitric oxide in coke oven flue gas

Abstract

The invention relates to a method for treating ammonia-containing tail gas and reducing nitric oxide in coke oven flue gas. The method comprises the following steps: 1) collecting the ammonia-containing tail gas generated by a storage tank of a coal gas purification system, and conveying the ammonia-containing tail gas to an acid pickling tower through a pipeline for acid pickling; 2) sending the tail gas subjected to acid washing into an alkaline washing tower through a pipeline for alkaline washing, and then conveying to a coke oven header pipe through an induced draft fan; 3) conveying the coke oven flue gas treated by the desulfurization and denitrification system to a coke oven header pipe through a pipeline; 4, the ammonia-containing tail gas and the coke oven flue gas are converged in the main pipe and then fed into an original coke oven combustion-supporting air system.The ammonia-containing tail gas of a coal gas purification system can be treated, meanwhile, the nitrogen oxide content of the coke oven flue gas can be reduced, two purposes are achieved at a time, and obvious economic benefits and environmental protection benefits are generated.

Description

technical field [0001] The invention relates to the technical field of coke oven production and operation, in particular to a method for treating ammonia-containing tail gas and simultaneously reducing nitrogen oxides in coke oven flue gas. Background technique [0002] During coke oven production, coke oven gas or blast furnace gas is used as the combustion medium. During the combustion process, due to the high temperature in the coke oven combustion chamber, the nitrogen oxide content in the exhaust gas reaches 500 mg / m3, which increases the processing load of the desulfurization and denitration system; On the other hand, in the gas purification system supporting coke oven production, the ammonia-containing tail gas from the HPF desulfurization and ammonium sulfate storage tanks is directly discharged, which cannot meet the requirements of environmental protection and causes the equipment of the gas purification system to corrode. SUMMARY OF THE INVENTION [0003] The pu...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of excessive nitrogen oxide content in coke oven flue gas and the direct discharge of ammonia-containing tail gas from the gas purification system, and provide a method for treating ammonia-containing tail gas while reducing coke oven flue gas nitrogen oxides

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