Cement kiln flue gas denitration device with waste heat recovery function and denitration method

Abstract

The invention discloses a cement kiln flue gas denitration device with a waste heat recovery function and a denitration method. The cement kiln flue gas denitration device comprises a heating frame, aliquid dispersion mechanism, a reaction frame, a waste heat recovery mechanism, a bag-type dust collector, a secondary reaction mechanism, a reducing agent mixer, a water delivery system and a high-pressure liquid dispersion system, wherein an upper outlet of the heating frame communicates with a lower inlet of the liquid dispersion mechanism, and an upper outlet of the liquid dispersion mechanism communicates with a lower inlet of the reaction frame. By arrangement of the liquid dispersion mechanism and the matched use of the reducing agent mixer and the high-pressure liquid dispersion system, and a mixed reducing agent and flue gas can be completely mixed and enter the reaction frame for primary non-catalytic reduction reaction, so that the denitration efficiency of the flue gas is effectively improved; The secondary reaction mechanism is arranged and matched with the bag-type dust collector for use, and multiple groups of plate-type catalysts are used for carrying out secondary catalytic reduction reaction denitration on flue gas still containing a small amount of NOx, so that the denitration efficiency of the flue gas is further improved.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a cement kiln flue gas denitrification device and a denitrification method with waste heat recovery. Background technique [0002] During the production of cement, NO x The total emissions rank second in industrial emissions, second only to the power industry. Among them, the power industry and the steel industry have implemented ultra-low NO x Therefore, the national emission standards for pollutants in the cement industry are becoming increasingly stringent. [0003] At present, my country's cement industry generally adopts selective non-catalytic reduction technology for denitrification of cement kiln flue gas. However, the removal efficiency is relatively low, and ammonia escape is serious, which cannot meet the existing emission standards. When the flue gas is denitrified, the recovery efficiency of waste heat is also relatively low, which will cause heat loss du...

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Problems solved by technology

[0003] At present, my country's cement industry generally adopts selective non-catalytic reduction technology for denitrification of cement kiln flue gas. However, the removal efficiency is relatively low, and ammonia escape is serious, which cannot meet the existing emission standards. When the flue gas is denitrified, the recovery efficiency of waste heat is also relatively low, which will cause heat loss during the denitrification process of cement kiln flue gas. Therefore, we propose a cement kiln flue gas denitrification device and denitrification method with waste heat recovery for solve the above problems

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