Denitration reducing agent formed by urea pyrolysis has advantages of stability and non-toxicity

but the low pyrolysis temperature will cause deposition in thermal decomposition furnace.Component analysis on deposition appeared on urea pyrolysis furnace of boiler in No.1-No.4 units for Beijing Jingneng Thermal Power Co.

Ltd.was conducted.Countermeasures were put forward

such as enlarging the pressure and flow of desalted water

decreasing the pyrolysis furnace case temperature range from 105-120 ℃ to 80-90 ℃

thickening the heat insulating materials outside the pyrolysis furnace and auxiliary pipes to increase the inlet ammonia temperature of ammonia injection grid and effectively inhibit the crystalline in pipes of pyrolysis furnace

replacing the carbon steel compressed air pipe for stainless steel pipe(for urea spray gun)

and installing high precision air filter.