CFB boiler SCR denitration technology and denitration device

Abstract

The invention discloses a Circulating Fluid Bed (CFB) boiler Selective Catalytic Reduction of NOx (SCR denitration technology) and a denitration device. The denitration technology comprises a denitration reactor, a coal economizer and a reductant injection grid, wherein the coal economizer comprises a primary coal economizer and a secondary coal economizer, the denitration reactor is arranged between the primary coal economizer and the secondary coal economizer, the reductant injection grid is arranged below the primary coal economizer, the flue gas which comes from the primary coal economizer is fully mixed with the reductant injected by the reductant injection grid and then enters the denitration reactor, denitration is carried out in the reactor which is provided with a built-in catalytic reactor, and the denitrated flue gas enters the secondary coal economizer. According to the invention, the high-dust concentration SCR denitration technology is adopted, the flow of the flue gas is simple, and the flue gas system resistance is low; by arranging the denitration reactor between the primary coal economizer and the secondary coal economizer of the CFB boiler, the denitration device and the boiler form an integral body, and the denitration device is in a proper denitration reaction temperature window, thus the denitration efficiency is high and can reach more than 90 %, the denitration device occupies little area, and the investment cost is low.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler SCR denitrification process and a denitrification device, belonging to the technical field of flue gas purification. Background technique [0002] Selective Catalytic Reduction of NOx (SCR denitrification process for short) is one of the more commonly used flue gas denitrification technologies at present. It has the advantages of high denitrification efficiency, good selectivity, and stable operation. The process principle is to spray the denitrification reducing agent ammonia into the boiler flue gas within the temperature window of 280°C-420°C, and under the action of the catalyst, the NOx in the flue gas is reduced to harmless N 2 and H 2 O, to achieve the purpose of removing NOx. [0003] Since the SCR denitrification process has specific requirements on the reaction temperature window, the temperature window component that meets the denitrification process for ordinary pulverized coal b...

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Problems solved by technology

This method needs to increase equipment, and its investment cost and operating cost will increase greatly, which is extremely uneconomical and not worth the candle

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