Directing against imperfect control functions in furnace safety supervisory system(FSSS) of 2×1 000 MW coal-fired units in second-phase project of Zheneng Power Generation Co Ltd

i.e.Ninghai Power Plant

the logic of FSSS has been examined and discussed

and being optimized from four aspects

namely prevention of pulverized coal accumulated in the mills being blown into furnace after start-up of the first primary air fan

prevention of exploision in the furnace

control of ignition energy in the coal pulverizing system

and the tripping conditions of protection device.After optimization

the stability and safety in boiler operation have been improved

and the risk in manipulation being decreased.