SNCR denitration system

Abstract

The invention relates to an SNCR denitration system, in particular to a circulating fluidized bed boiler SNCR denitration system. The SNCR denitration system includes a boiler body and a separator, wherein the boiler body is connected with the separator through an inlet flue, the separator is further provided with an outlet flue, and the boiler body is further provided with a plurality of secondary air duct; and the secondary air ducts are connected with the boiler body through elbow air ducts, and spraying guns are disposed in the inlet flue, the outlet flue and the elbow air ducts. The problem that the denitration efficiency cannot be ensured under the condition of full load operation of a circulating fluidized bed boiler in the prior art is solved, or the problem of low denitration efficiency under the full load condition is solved. The requirement of ultra-low emission of the circulating fluidized bed boiler is met well through arrangement of different positions and different formsof the spraying guns.

Description

technical field [0001] The invention relates to an SNCR denitration system, in particular to an SNCR denitration system for a circulating fluidized bed boiler. Background technique [0002] Selective non-catalytic reduction (SNCR) refers to the reduction of nitrogen oxides in the flue gas to harmless nitrogen and water by spraying a reducing agent in the "temperature window" suitable for denitrification reaction without the action of a catalyst. This technology generally uses ammonia, urea or hydrogen acid in the furnace as a reducing agent to reduce NOx. The reducing agent only reacts with NOx in the flue gas, and generally does not react with oxygen. This technology does not use a catalyst, so this method is called Selective Non-Catalytic Reduction (SNCR). Since the process does not use a catalyst, a reducing agent must be added in the high temperature zone. The reducing agent is sprayed into the area where the temperature of the furnace is 850-1100°C, and rapidly therma...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an SNCR denitrification system, which is used to solve the problem of low denitrification efficiency of circulating fluidized bed boilers in the prior art under full load conditions

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