Abstract:

Due to that the practically fired coal of the boiler deviates greatly from the designed coal grade, the efficiency of the Wshape flame boiler of the 660MW unit in a power plant is lower. Aiming at this problem, the combustion optimized adjustment experiment was carried out. As first step, the F damper was regulated to balance the oxygen distribution in the outlet of the coal economizer. Then, starting from the main factors influencing on the operational economical efficiency of the boiler, combining with the features of the boiler, the influences of the load variation, the second air flow variation, the coal quality variation and the open degrees of C damper on the boiler efficiency were analyzed; and a rational operating condition was proposed.

Key words: W-shape flame boiler, experiment of combustion adjustment, boiler efficiency, operating condition