Ammonium bicarbonate direct injection denitration reduction system and method

Abstract

The invention provides an ammonium bicarbonate direct injection denitration reduction system and method. An ammonia preparation system is simple. The preparation conditions of a thermal power plant under different loads at present can be met. On-demand distribution of ammonia at different positions of an inlet flue is realized. The operation and maintenance cost is low. The problems that the system is easily blocked and a safety risk exists when a ammonium bicarbonate solution is stored are solved. The system comprises an ammonium bicarbonate dissolving device, an ammonium bicarbonate solution storage device, a metering distribution module, an injection device and an SCR denitration reactor which are connected in sequence. The injection device comprises a plurality of parallel injectors, a nozzle is arranged at the output end of each injector, an ammonium bicarbonate solution inlet is formed in the input end of each injector, a communicated atomized compressed air inlet is formed in one side of each ammonium bicarbonate solution inlet, and the injectors are arranged in an inlet flue of the SCR denitration reactor in the flue gas direction. The metering distribution module is connected with the ammonium bicarbonate solution inlets of the injectors.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification treatment, in particular to an ammonium bicarbonate direct injection denitrification reduction system and method. Background technique [0002] The SCR denitrification device in a coal-fired power plant uses ammonia as the reducing agent. 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Under the action of a catalyst, the NO in the flue gas and the reducing agent NH 3 The following reaction occurs: [0003] 4NH 3 +4NO+O 2 →4N 2 +6H 2 o [0004] The source of ammonia gas is generally liquid ammonia or urea. Since liquid ammonia is a major hazard, urea has been gradually used to replace liquid ammonia. Although urea is safe to store, the process of preparing ammonia consumes a lot of energy (steam is used for hydrolysis of urea, and electricity is used for pyrolysis of urea), and the operating cost is relatively high, and urea solution is easy to block corrosion pipes or crystallize to block ...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the problems existing in the prior art, the present invention provides an ammonium bicarbonate direct injection denitrification reduction system and method. The ammonia production system is simple and can meet the preparation conditions under different loads of the current thermal power plant, and realize the On-demand distribution of the required amount of ammonia gas, low operation and maintenance costs, and solves the problems of easy blockage of the system and safety risks when storing ammonium bicarbonate solution

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