A simple and convenient diagnosis method of energy-saving has been put forward

and the analysis and calculation being carried out by using the performance test data and the turbine's structural data.The operation performance diagnosis of flow passage in steam turbine

as well as of heat regeneration system

feed-water pump

small steam turbine

desuperheating water

shaft seal system

condenser

pressure loss of the extracted steam

loss of steam and water

and all parameters in operation has been carried out for a typical 330 MW unit

and the energy loss distribution diagram being given.The diagnosis shows that the total deviation of heat consumption for all factors is 448.25 kJ/kWh

tallying well with the designed value and tested value.