Deashing device for SCR flue gas denitration system

Abstract

The invention relates to a deashing device for an SCR flue gas denitration system. The deashing device comprise a preposed ash bucket and a catalyst bed; the catalyst bed body is arranged in a shell; a guide plate is arranged in the shell; a flue gas outlet of an economizer is connected with the preposed ash bucket; the preposed ash bucket communicates with the shell through a horizontal flue, an uptake flue and the shell; an ash blocking plate is arranged on the joint of the preposed ash bucket and the horizontal flue; and an air-lock powder supply device or a gas blowing tube is arranged at an inner bottom end of the joint of the uptake flue and the horizontal flue. The device provided by the invention can effectively reduce abrasion, clogging and poisoning on the catalyst, caused by flue gas fly ash, increase service life of the catalyst and lower operating costs; on the other hand, the air-lock powder supply device or the gas blowing tube arranged at an elbow position of the horizontal flue can effectively remove dust accumulated in the device, ensure smoothness of the flue, reduce the weight of the device, ensure continuous operation of the system, and increase the overall economic benefits.

Description

technical field [0001] The invention belongs to the technical field of atmospheric pollutant treatment, and specifically relates to a device for effectively removing fly ash in the flue gas passing through the SCR flue gas denitrification system and ash accumulation in the device through various methods, so as to reduce the wear and blockage of the catalyst by the fly ash , to ensure long-term stable operation of the device. Background technique [0002] Since my country's "Twelfth Five-Year Plan" period has raised the emission standards for nitrogen oxides, most power plants currently use selective catalytic reduction (selective catalytic reduction, SCR) flue gas denitrification process for thermal power plant flue gas denitrification, in which the SCR reactor is The core equipment of SCR process. Conventionally, most SCR reactors are chosen to be arranged after the boiler economizer. Due to the high concentration of fly ash in the flue gas, on the one hand, it is easy to c...

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Problems solved by technology

Conventionally, most SCR reactors are chosen to be arranged after the boiler economizer. Due to the high concentration of fly ash in the flue gas, on the one hand, it is easy to cause wear, blockage and poisoning of the catalyst, shorten the life of the catalyst, and increase the operating cost; on the other hand, the reaction The lower elbow of the flue gas inlet section of the reactor is prone to ash accumulation, which blocks the flow of flue gas, increases the weight of the reactor, and even causes the shutdown of the reactor, resulting in huge losses

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