Research on Thermal Economic Diagnosis Method Based on the Improved Equivalent Enthalpy Drop Method for Thermal System of Steam Turbine

In order to tap the potentials of energy saving of thermal system,the technology measure that can be used to improve the precise of performance diagnosis for thermal system must to be study.To counter the question of usual ideal cycle thermal efficiency,the new defined ideal cycle thermal efficiency that can be fit for reheat steam turbine is proposed.Also,by introducing the new concept of heat absorption factor,the new energy balance equation is given,and it is conventional to calculate the effects of the changes of part element on ideal cycle thermal efficiency and heat absorption factor.Then,based on the improved ideal cycle thermal efficiency,equivalent enthalpy drop method is improved,and the ideal equivalent enthalpy drop method is proposed.Finally,based on the new equivalent enthalpy drop method,the diagnosis is done for thermal system of 300MW steam turbine,and the effectiveness is proved.