A kiln scr denitrification process

Abstract

The invention belongs to the technical field of industrial exhaust gas treatment, and more specifically relates to a kiln SCR denitration technology. The kiln SCR denitration technology comprises following steps: kiln extreme cold segment high temperature flue gas is introduced into a kiln head; when the high temperature flue gas is introduced into the kiln head, kiln head high temperature flue gas is mixed with flue gas in the kiln head, so that the temperature of the flue gas in the kiln head is increased to 350 DEG C; after temperature increasing, the high temperature flue gas is introducedinto a SCR denitration device; after introduction of the high temperature flue gas into the SCR denitration device, ammoniacal liquor is introduced into the SCR denitration device for reaction of ammoniacal liquor with high temperature flue gas; after reaction, the gas obtained after denitration is discharged into the air. The kiln SCR denitration technology is suitable for high standard industrial exhaust gas treatment, can be used for reducing the content of nitrides in industrial exhaust gas to be lowest, reducing atmosphere pollution, increasing denitration rate, is convenient for recycling of reducing agents, and is capable of reducing treatment cost.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas treatment, in particular to a kiln SCR denitrification process. Background technique [0002] In recent years, environmental pollution problems such as smog, acid rain and photochemical smog caused by various air pollutants emitted by my country's industrial production have emerged one after another, causing great harm. The requirements for emission limits of atmospheric pollutants from boilers are becoming increasingly stringent, the state and government have continuously revised the emission standards of air pollutants, and the control requirements have been continuously improved. From the 2011 "Pollutant Emission Standards for Thermal Power Plants" Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020), the emission requirements of coal-fired units for nitrogen oxides are further increased from 100mg / Nm3 to 50mg / Nm3 for gas-fired un...

AI Technical Summary

Problems solved by technology

Although this method can remove nitrogen oxides in industrial waste gas, the traditional SCR denitrification device is no longer fully capable of meeting the higher and higher emission requirements. The traditional process cannot effectively solve the escape of ammonia gas, and the traditional method requires SCR denitrification. The device is heated to make the catalyst reach the ideal catalytic temperature. At the same time, the traditional method of using ammonia and industrial waste gas to react cannot guarantee the complete reaction. It is inconvenient to recover the remaining reducing agent after the reaction, which increases the cost and causes economic losses.

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