Based on single factor alternate method

the influence of oxygen content that under different unit loads with current coals as the fuel on boiler efficiency

as well as on auxiliary equipment power consumption and NOx emission was investigated

taking boiler of a 600 MW supercritical unit as the object.Moreover

the optimal oxygen content was determined

and the control curve for oxygen content optimization was obtained.Results show that

under the loads of 600

480

420 and 360 MW

with the increasing oxygen content

the boiler efficiency decreases

and the fan power consumption and NOx emission increases.The test data indicate that oxygen content in this power plant is high under the current operation mode.Regulation should be carried out according to the optimization curve obtained.