SNCR denitration apparatus of circulating fluidized bed boiler

Abstract

The invention discloses novel selective non-catalytic reduction (SNCR) denitration apparatus of a circulating fluidized bed boiler, and belongs to the field of SNCR flue gas denitration of circulatingfluidized bed boilers. The SNCR denitration apparatus comprises an ammonia water storage tank, a double-fluid spray gun, a cyclone separator outlet flue and the like; an outlet of the ammonia water storage tank is connected with an inlet of an ammonia water variable-frequency pump through a conveying pipe; an outlet of the ammonia water variable-frequency pump is connected with a liquid inlet ofthe bottom end of the double-fluid spray gun through a conveying pipe; an outlet of a desalted water tank is connected with an inlet of a desalted water variable-frequency pump through a conveying pipe; an outlet of the desalted water variable-frequency pump is connected with an outlet conveying pipe of the ammonia water variable-frequency pump through a conveying pipe; an outlet of a compressed air tank is connected with an atomizing air interface of the double-fluid spray gun through a conveying pipe; an outlet of a protective air device is connected with an inlet of a protective air conveying fan through a conveying pipe; an outlet of the protective air conveying fan is connected with a cooling air interface of the double-fluid spray gun through a conveying pipe; and the double-fluid spray gun is inserted into the cyclone separator outlet flue, wherein all the conveying pipes are stainless steel pipes. The SNCR denitration apparatus has the advantages that the air quantity demand issmall, energy consumption is low, and the service life of the system is long, and the like.

Description

technical field [0001] The invention belongs to the field of SNCR flue gas denitrification of circulating fluidized bed boilers, and in particular relates to an SNCR denitrification device of circulating fluidized bed boilers. Background technique [0002] At present, flue gas denitrification technologies mainly include SCR (selective catalytic reduction reaction) denitrification and SNCR (selective non-catalytic reduction reaction) denitrification technologies. Considering that SCR denitrification technology needs to add catalyst, the investment and operation costs are high, and the denitrification efficiency is high. It is generally suitable for pulverized coal boilers with high original nitrogen oxide generation; for circulating fluidized bed units with low combustion temperature, classification, Due to the characteristics of staged combustion, it produces less nitrogen oxides. Therefore, SNCR denitrification technology is generally used for CFB boiler units to make the e...

AI Technical Summary

Problems solved by technology

Among them, the flue gas flow rate and ash concentration at the inlet flue of the cyclone separator are relatively large, and the spray gun is easily worn, resulting in shortened service life of the spray gun

Once the spray gun is worn out, the atomization degree of the reducing agent will decrease, and the denitrification efficiency will decrease accordingly

Images