In order to improve the economy and safety of boiler operation

the furnace temperature of a 330 MW W-shaped flame boiler was measured by acoustic pyrometer. The accuracy of the acoustic pyrometer was verified by a suction thermocouple. The result shows that

the acoustic pyrometer can accurately reflect the distribution and change of flue gas temperature in the furnace. On this basis

carrying out combustion adjustment can avoid the incomplete combustion and slag in local area of the boiler

thus to enhance the economy and safety of the boiler. After combustion adjustment aided by the acoustic pyrometer

the 300 MW unit boiler's thermal efficiency increased by 1.4%

indicating the effect is good.