Under depth peak load regulation operation condition of coal-fired boilers

the flame fullness of the boiler reduces

the combustion stability declines

and the boiler is prone to a series of problems such as instable hydrodynamic characteristics and uneven distribution of heat load. The temperature field distribution and the combustion state monitoring of furnace flame are of great significance to the safety and economy of the unit. This paper takes a deep peaking test of a supercritical 660 MW unit as an example

uses two-color spectroscopy method to measure the temperature field of the furnace flame and studies the influence of main operating parameters on the temperature field distribution of the burner nozzle. The results show that

this method can measure the temperature field of furnace flame timely and accurately

which is helpful to guide the refined combustion adjustment test under depth peak load regulation

and further enhance the depth peak shaving capacity of the boiler. Through this refined combustion adjustment test

the thermal efficiency of the boiler was maintained between 92% and 94% under low load operation conditions

the economical efficiency of the unit had no significant decrease

the safety

economy and environmental protection indicators of the unit were good

which can ensure high efficiency and low pollution combustion of the boiler.