Device and process method for ERDIII cement plant ultra-low emission denitration

Abstract

The invention discloses a device and a process method for ERDIII cement plant ultra-low emission denitration. The device for ERDIII cement plant ultra-low emission denitration comprises a decomposition furnace and a powder denitration agent conveying unit, wherein the bottom part of the decomposition furnace is provided with a secondary wind inlet which is connected with a cement rotary kiln; thedecomposition furnace comprises a reducing zone, a main burning zone, a reburning zone and a burnout zone from bottom to top; the reducing zone is equipped with a reducing zone saturated steam catalytic burner; the reburning zone is equipped with a reburning zone saturated steam catalytic burner; the main burning zone is connected with tertiary wind; the burnout zone is connected with burnout wind; and the discharge pipe of the powder denitration agent conveying unit is connected with a denitration agent spray gun which is connected with the reburning zone. According to the invention, throughintroduction of a denitration catalyst, the usage amount of ammonia water for denitration is reduced; the cost is saved; ammonia escape is reduced; more economy and environmental friendliness are achieved; and due to reduction of ammonia escape, corrosion to subsequent equipment is avoided.

Description

technical field [0001] The invention belongs to the field of flue gas denitrification in cement production lines, and specifically relates to an ultra-low emission denitrification device of an ERDIII cement plant; in addition, the invention also relates to an ultra-low emission denitration process method of an ERDIII cement plant. Background technique [0002] SNCR Selective Non-Catalytic Reduction Denitrification—the denitrification technology with the largest market share, the ammonia nitrogen ratio is designed to be 1~1.5. The high operating cost of denitrification increases the burden on enterprises. [0003] The utility model patent with the application number 201720210300.1 filed by the applicant on March 6, 2017 discloses an ERD+ coal-fired saturated steam catalytic combustion denitrification device. The cement rotary kiln is connected; the lower section of the calciner includes a reduction zone, a main combustion zone, and a reburning zone from bottom to top, and a ...

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Problems solved by technology

[0004] (1) ERD + coal-fired saturated steam catalytic combustion denitrification technology still cannot meet the requirements of maintaining the NOx emission concentration within 50mg / Nm³ or stably operating at 50mg / Nm³, requiring a large amount of ammonia injection, causing secondary pollution

[0005] (2) The comprehensive denitrification efficiency of ERD+ reaches over 80%, which cannot meet lower emission requirements

[0006] (3) The consumption of ammonia water is still relatively large, and a large amount of ammonia water is sprayed in pursuit of ultra-low emissions, but it is easy to cause high ammonia escape and cause corrosion to subsequent equipment

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