Effect of Low Pressure Economizer on Relatively Internal Efficiency of Steam Turbine

Abstract:

Assembling low pressure economizer is one of the important measures for energy-saving and emission reduction in power plants.An analysis is made of the 350 MW Unit installed with low pressure economizer,which consists of two linking models,series and parallel way.As exhaust gas temperature is lowered by 25 ℃,and steam state changes according to isentropic process in extraction hole,the relative internal efficiency decreases by 0.012 9% in series and 0.007 2% in parallel,and the cycle efficiency increases by 0.606 2% and 0.656 7%,respectively,and absolute internal efficiency 0.615 2% and 0.691 8%,respectively.As the extraction hole steam state is in isothermal process,the relative internal efficiency relative increases by 0.020 6% in series and 0.042 7% in parallel;cycle efficiency increases by 0.602 5% and 0.651 4% respectively,and absolute internal efficiency by 0.645 2% and 0.736 5%,respectively.