MAINTENANCE STRATEGY OF LARGE-CAPACITY GAS-STEAM COMBINED CYCLE UNIT

An operating mode of carrying out start-up and shutdown in each day has been adopted by a two-shift operatonal 9F class gas-steam combined cycle unit,but the maintenance mode at present is still continued to use that of the conventional thermal power units,resulting in poor reliability of the unit's equipments,especially of the auxiliary equipments,and making their maintenance into a passive position.For this,a maintenance management mode taking reliability as the centre has been put forward,an approach to the maintenance strategy of equipments,the maintenance period of them,and the application of detecting technology for equipments' status etc.being made,as well as the repair mode and repair strategy suitable to large-capacity gas turbine's repair and maintenance being suggested.