Abstract:

Abstract:Through analyzing the drastic fluctuation of flame detecting signals in layer D burner for No.62 boiler that is working under low load conditions in Sichuan Guang'an power plant, the reason is considered as the pulverized coal of layer D burner ignition delayed and generated an overlength unburned zone, and consequently influenced the combustion of neighbor layer. Through adjusting the parameters, such as temperature of primary air, fineness of pulverized coal, flow of primary air and secondary air et al., the ignition condition of pulverized coal is improved and the ignition time is shortened，which makes the pulverized coal burnt quickly after entering furnace. After the combustion adjustments, the fluctuation of flame detecting signals becomes normal at low load conditions.