Cement kiln flue gas denitration process

Abstract

Belonging to the field of flue gas treatment, the invention particularly relates to a cement kiln flue gas denitration process. The process includes the steps of: S1. conducting pouring to form a denitration barrel, and forming pores on the barrel wall of the denitration barrel; S2. horizontally and rotatably arranging the denitration barrel in a denitration tower; S3. in the rotating process of the denitration barrel, letting flue gas contact the denitration barrel and then enter the pores, adopting vanadium-titanium in the slag as a catalyst for nitrogen oxide reduction, and reducing the nitrogen oxide in the flue gas into nitrogen by biomass charcoal powder; and S4. letting the flue gas entering the pores flows in the step 3 flow reversely under the blocking of a rotating pipe, reducingpart of the unreduced nitrogen oxide in the flue gas into nitrogen by biomass charcoal powder, and further enabling the denitration barrel to rotate along with the rotating pipe in the reverse flow process, and discharging the nitrogen out of the denitration tower after escape from the pores. The technical scheme adopted by the invention can improve the flue gas denitration effect.

Description

technical field [0001] The invention belongs to the field of flue gas treatment, and in particular relates to a cement kiln flue gas denitrification process. Background technique [0002] A large amount of nitrogen oxides will be produced in the cement production process, and the direct discharge of nitrogen oxides in the flue gas will cause environmental pollution. At present, ammonia gas is injected into the denitrification tower, and ammonia gas is used as a reducing agent to reduce nitrogen oxides into nitrogen gas; however, the denitrification efficiency is low, and ammonia escape will occur, causing secondary pollution. [0003] Nowadays, carbonaceous material filter layers are usually installed in the denitrification tower. After nitrogen oxides pass through the carbonaceous material filter layer, the nitrogen oxides are reduced. The denitrification effect is not very good. Usually, it is necessary to install multiple carbonaceous material filter layers. The cost Hig...

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Problems solved by technology

[0002] A large amount of nitrogen oxides will be produced in the cement production process, and the direct discharge of nitrogen oxides in the flue gas will cause environmental pollution

At present, ammonia gas is injected into the denitrification tower, and ammonia gas is used as a reducing agent to reduce nitrogen oxides into nitrogen gas; however, the denitrification efficiency is low, and ammonia escape will occur, causing secondary pollution

[0003] Nowadays, carbonaceous material filter layers are usually installed in the denitrification tower. After nitrogen oxides pass through the carbonaceous material filter layer, the nitrogen oxides are reduced. The denitrification effect is not very good. Usually, it is necessary to install multiple carbonaceous material filter layers. The cost Higher; and when replacing the filter layer of carbonaceous material, it is necessary to stop the kiln or block the flue gas pipe. On the one hand, stopping the kiln will affect the production progress; have an impact

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