Anti-blocking blocking-relieving method and apparatus for coke oven flue gas SCR (selective catalytic reduction) denitration catalyst

Abstract

The invention relates to an anti-blocking blocking-relieving method and apparatus for coke oven flue gas SCR (selective catalytic reduction) denitration catalyst. One side of a lower ash bucket of a denitration reactor is provided with a flue gas inlet, the other side of the top end of an upper straight barrel is provided with a purified flue gas outlet, a metal strainer and multiple layers of denitration catalyst are arranged in the upper straight barrel sequentially from bottom to top, a first flushing pipe is arranged above the metal strainer, a second flushing pipe and a heating air pipe are arranged above each layer of denitration catalyst, the first flushing pipe and the second flushing pipes are connected with an external flushing water supply device through a pressure pump after being communicated, the heating air pipes are connected with an external heating device after being communicated, and the bottom of the lower ash bucket is provided with a drain valve. The metal strainer is disposed at the front of the denitration catalyst to intercept ammonia salts and sticky particles in the coke oven flue gas and prevent blocking of the denitration catalyst; the flushing pipes are arranged above the denitration catalyst to flush blockage; therefore, efficient denitration of the denitration catalyst is guaranteed, and the life of the denitration catalyst is extended.

Description

technical field [0001] The invention relates to the technical field of coke oven flue gas purification, in particular to a coke oven flue gas SCR denitrification catalyst blocking prevention method and device. Background technique [0002] The temperature of coke oven flue gas is about 180 ℃ ~ 300 ℃, which belongs to medium and low temperature flue gas. The components of coke oven flue gas are complex, in addition to carbon dioxide, nitrogen, oxygen and other main components, it also contains sulfur dioxide, nitrogen monoxide, water vapor, tar, ammonia, carbon monoxide, free carbon, hydrogen sulfide, benzene and so on. [0003] When the denitrification of coke oven flue gas adopts the SCR process with ammonia as the reducing agent, ammonia in the coke oven flue gas will form various ammonium salts with sulfur dioxide, carbon monoxide, hydrogen sulfide, etc., which will be precipitated under low temperature conditions; water vapor, Tar, free carbon, benzene, etc. will form s...

AI Technical Summary

Problems solved by technology

The ammonium salt and particles precipitated in the flue gas will deposit on the pore surface of the SCR catalyst, covering the catalytic active site, blocking the airflow channel, causing increased resistance, deactivation of the catalyst, and a decrease in denitrification efficiency

[0004] Due to the certain viscosity of coke oven flue gas impurities, the conventional sonic soot blower cannot meet the cleaning requirements

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