Dust SCR denitration device and technology for cement kiln

Abstract

The invention belongs to the technical field of flue gas treatment and environmental protection for cement kilns, and particularly relates to a dust SCR denitration device and technology for a cementkiln. The dust SCR denitration device comprises a rotary kiln, a kiln tail residual gas treatment system and a kiln head residual gas treatment system; the kiln tail residual gas treatment system comprises a five-stage cyclone preheater, an SP furnace, a dust remover, an SCR reactor, a high-temperature blower, a humidifying tower / waste heat boiler, a kiln tail bag dust removing unit, a kiln tail exhaust blower and a kiln tail chimney; the five-stage cyclone preheater is connected to the kiln tail of the rotary kiln; the cyclone dust remover is arranged in front of the SCR reactor for flue gasdust removal, the content of flue gas dust at the SCR reaction is lowered, the number of pores of a honeycomb catalyst can be increased, and the overall height of the catalyst and the reactor can be effectively lowered on the condition that the cubic number and the number of layers of the catalyst are not changed; the pressure loss of the whole reactor is lowered, power of the blower at the rear end can be reduced, and energy consumption is lowered.

Description

technical field [0001] The invention belongs to the technical field of cement kiln flue gas treatment and environmental protection, and in particular relates to an SCR denitrification device and process for dust arrangement in a cement kiln. Background technique [0002] In recent years, my country's nitrogen oxide emissions have increased year by year, and the cement industry's nitrogen oxide emissions have also shown a rapid growth trend. After thermal power and motor vehicles, it has become the third largest source of nitrogen oxide emissions. The rapid increase in nitrogen oxide emissions has led to a series of urban and regional environmental problems. Following the large-scale promotion of denitrification work in the thermal power industry, my country will promote the control of nitrogen oxide emissions in other industries, mainly the cement industry. [0003] In March 2014, the GB4915-2013 version of the "Emission Standards for Air Pollutants in the Cement Industry" c...

AI Technical Summary

Problems solved by technology

[0004] Because the flue gas of cement kiln is different from the flue gas produced by general coal-fired boilers, it has the characteristics of complex flue gas composition and high dust content. At present, the selective non-catalytic reduction (SNCR) nitrogen oxide removal efficiency commonly used in cement kilns is 60 %, it is difficult to meet the increasingly stringent emission standards

SCR flue gas denitrification technology has been very mature in the thermal power industry, but the SCR flue gas denitrification technology in the cement industry is still in the stage of pilot test, individual project demonstration and accumulation of test data and operation experience, and there is still a lack of experience in engineering application

To achieve discharge standards, the denitrification efficiency should not be lower than 90%

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