Based on the features of thermodynamic system for the 350 MW unit in one power plant

the emulation model for said system has been established.Results of emulation under condition of mixedly burning coal and blast furnace gas of low calorific value show that the main parameters tally with the actual parameters in operation of unit.On the basis of this

directing against the problems of high discharged flue gas temperature etc.existing in mixedly burning

analysis has been carried out

and improvement measure of suitably increasing the heat exchange area of air preheater has been put forward

so as to reduce the discharged flue gas temperature and enhance the boiler effciency.