Device for semi-dry desulfurization, dust removal and low-temperature denitration of coke oven flue gas and technological method thereof

Abstract

The invention relates to a device for semi-dry desulfurization, dust removal and low-temperature denitration of coke oven flue gas and a technological method thereof, belongs to the technical field ofneed of flue gas purifying devices. The device comprises a coke oven, a semi-dry desulfurization tower, a bag-type dust remover, an SCR reactor, aninduced draft fan and a chimney which are sequentially connected through a flue, wherein a rotary atomizer is mounted on the top of the semi-dry desulfurization tower; a tower bottom ash discharging valve is mounted at a conical hopper of the semi-drydesulfurization tower; a screw conveyor is mounted at the bottom of the bag-type dust remover and is connected with an ash silo through a scraper conveyor and a bucket elevator; and an ash dischargingvalve is arranged on an ash hopper at the lower part of the ash silo. By a rotary spraying semi-dry desulfurization technology, no wastewater is discharged, desulfurization slag has a stable market channel, and an environmental protection problem is completely solved; during discharge, no white mist tailing phenomenon is caused; and the service life of a low-temperature catalyst is prolonged. Thedevice can be widely applied to occasions where the flue gas purifying devices are needed, and is especially applicable to the field of low-temperature denitrification, desulfurization and dust removal in the coke oven, a garbage incinerator, an industrial kiln and the like.

Description

technical field [0001] The invention relates to a coke oven flue gas semi-dry desulfurization, dust removal and low-temperature denitrification device and a process method thereof, belonging to the technical field of flue gas purification devices. Background technique [0002] At present, the coke oven waste gas used for coke oven heating in the production of coke ovens in the domestic coking industry is collected through the main flue and discharged directly to the atmosphere through the chimney. The air pollutants emitted by the coke oven chimney are the waste gas produced after the combustion of coke oven gas, mainly SO 2 , NO x It is one of the most polluting industries. [0003] In June 2012, the Ministry of Environmental Protection and the State Administration of Quality Supervision, Inspection and Quarantine jointly issued the "Emission Standards for Pollutants in the Coking Chemical Industry" (GB16171-2012), which clearly stipulates the emission standards for air p...

AI Technical Summary

Problems solved by technology

Due to the long-term operation of coking enterprises, the leakage between the carbonization chamber and the combustion chamber may be caused, which will cause the tar content in the flue gas to be too high. The failure of the catalyst by tar is irreversible. cause great economic loss

[0006] At present, some enterprises have adopted low-temperature SCR denitrification technology + wet desulfurization technology, but they all ended in failure due to catalyst poisoning. Although wet desulfurization is more efficient than dry and semi-dry desulfurization, the investment and operating costs are very high. A large amount of waste water is produced, while the concentration of sulfur dioxide in the coke oven flue gas is relatively low, and the concentration of sulfur dioxide in the flue gas is 200-250mg / Nm 3 , should not use wet desulfurization

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