Through parameter control test in operation of boiler equipment for one ultra-supercritical 1000 MW unit

the main points in control as well as the variation of main parameters in operation of said boiler under condition of load change have been presented.The test shows that:air/fuel ratio is slightly reduced as the load increases;the primary air pressure is enhanced as the load increases

the pressure drop in superheater and reheater is increased as the load increases;the variation of air/fuel ratio during the time of load change is mainly controlled by the temperature of superheated steam

before reaching critical pressure

the superheat degree of exit steam from the steam-water separator has to be controlled to below 30 ℃

and in case of unit's load being above 750 MW

the superheat degree of said exit steam has to be controlled to about 40 ℃.