二次再热超临界供热机组热力系统经济性定量分析方法

针对二次再热超临界供热机组采用低压缸分缸抽汽供热的特点，利用等效热降理论，进行分析与数学推导，得出了该类型机组抽汽等效热降和抽汽效率的计算方法，形成该类型机组的经济性定量分析数学模型，从而将等效热降理论的应用范围拓展到二次再热供热机组。利用该模型，可以方便、迅速、准确地分析二次再热超临界供热机组热力系统的经济性。

Economic-quantitative Analysis Method Used for the Thermodynamic System of a Supercritical Heat Supply Unit with a Double Reheat

A supercritical heat-supply unit with a double reheat employs steam extraction from a low-pressure turbine cylinder for supplying process heat. On the basis of the above arrangement, a method for calculating equivalent enthalpy drop and steam extraction efficiency for the above unit is obtained by making use of an equivalent thermal-drop theory and performing a theoretical analysis and mathematical deduction. A mathematical model based on an economic-quantitative analysis has been derived for the above-mentioned turbine unit, thereby extending the application range of the equivalent heat-drop theory to heat supply units with a double reheat. By using this model it is possible to effect a convenient, rapid and accurate analysis of the thermodynamic system cost-effectiveness of the above supercritical heat supply unit.