Cement kiln flue gas dry desulfurization and high dust SCR denitration device and process

Abstract

The invention relates to a cement kiln flue gas dry desulfurization and high dust SCR denitration device, which comprises a preheater C1 and a preheater C2, a high dust SCR denitration reactor, a waste heat boiler at the cement kiln tail, a high temperature fan and a desulfurizer grinding and conveying system, wherein a desulfurizer dosing device is arranged between a waste heat boiler outlet andthe high temperature fan; the desulfurizer dosing device is connected with the desulfurizer grinding and conveying system; a gas outlet of the preheater C1 is connected with a gas inlet of the high dust SCR denitration reactor; a gas outlet of the high dust SCR denitration reactor is connected with a gas inlet of the waste heat boiler; a double fluid atomization spray gun for a denitration agent ammonia atomization jet is arranged between the preheater C1 of a cement kiln and the preheater C2 of the cement kiln; the high dust SCR denitration reactor comprises a flue gas flow equalizer, a highdust SCR catalyst layer, a soot blower and a catalyst reserve layer; the desulfurizer grinding and conveying system comprises a desulfurizer pulverizer and a Roots blower; and a desulfurizer powder bin is arranged between the desulfurizer pulverizer and the Roots blower.

Description

technical field [0001] The invention belongs to the field of multi-pollutant integrated control of cement kiln flue gas, and specifically relates to a cement kiln flue gas dry desulfurization and high-dust SCR denitrification device and process. Background technique [0002] With the increasingly stringent environmental protection emission standards and the increasing efforts of the state to control pollution, the emission standards for cement kiln flue gas have been revised. At present, the in-depth treatment of cement kiln flue gas has been officially mentioned on the daily agenda. Since July 1, 2015, existing enterprises have begun to strictly implement GB4915-2013 "Emission Standards of Air Pollutants for the Cement Industry", requiring existing and newly established cement enterprises to change the NOx emission limit from the original 800mg / Nm 3 (NO 2 @10%O 2 , the same below) to 400mg / Nm 3 (NOx emission limit in key areas is 320mg / Nm 3 ). In recent years, the coun...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the deficiency of existing cement kiln flue gas treatment, and discloses a cement kiln flue gas dry desulfurization and high dust SCR denitrification device and process, which can not only treat SO in cement kiln flue gas 2 , NOx, etc. for integrated dry purification treatment, and has the advantages of small total investment, small system resistance, low operating energy consumption, small footprint, simple process, high desulfurization and denitrification efficiency, and convenient operation and maintenance.

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