Based on the simplified net boiler efficiency

optimization tests on the 1 025 t/h boiler for a power plant was conducted to investigate the influence of such parameters as the oxygen content at outlet of the furnace

primary air pressure and the coal particle size etc.on the heat efficiency of boiler

as well as the auxiliary power consumption and the simplified net boiler efficiency.Result show that

under high load condition

the net boiler efficiency reaches the maximum value when the oxygen content at outlet of the furnace is controlled at 3.0% and the primary air pressure at 8.1 kPa.Within the test range

the influence of coal particle size on power consumption of coal pulverizing system is small.It is suggested that

the primary air pressure at entrance of the coal mill and the coal particle size should be decreased as low as possible

on the premise of ensuring the primary air tube not be blocked and the mill output satisfy the running requirements.