CONTROL OF MAIN STEAM TEMPERATURE FOR SUPERCRITICAL 600 MW UNIT EQUIPED WITH DOUBLE-INLET AND DOUBLE-OUTLET COAL PULVERIZER

Directing against the problems existing on supercritical 600 MW units no.3 and no.4 in Qinbei Power Generation Co Ltd ever since begining of putting them into operation,such as over temperature of the main steam,and the main steam temperature can't be automatically controlled during the process of varying load of units etc.,adjustment and optimization of the main steam temperature control,the inlet temperature control for separators,and the proportioning ratio control of water and coal etc.have been carried out.After optimization,the main operation parameters,such as the main steam temperature and pressure,and the load of units etc.,can be controlled in a reasonable range under dynamic and static operation conditions,enhancing the automatic control level of units.