用等效热降法确定排汽压力变化对机组经济性的影响

针对排汽压力变化对机组经济性的影响，提出一种新的定量方法－排汽压力等效热解降计算法，该方法以汽轮机变工况为基础，应用等效热解的理论确定排汽压力变化对机组经济性的定量影响，实例计算表明，该方法简捷准确，实用性强，其计算误差小于工程现有的计算方法。

Determination of the Impact on Machine unit Economic Performance of Exhaust Steam Pressure Variation by an Equivalent Enthalpy Drop Method

With regard to the impact on machine unit economic performance of exhaust steam pressure variation a new quantitative method, i.e., exhaust pressure equivalent enthalpy drop calculation method, is expounded in this paper. On the basis of steam turbine off design operating conditions the proposed method determines the quantitative effect on machine unit economic performance of exhaust steam pressure variation by employing the theory of equivalent enthalpy drop. Calculation results of specific examples show that the method features simplicity of use as well as high precision and practicality. Its calculation error is lower than that of other currently available engineering methods.