【摘要】 该文针对二次再热超临界机组采用了二次再热和高低压加热器回热抽汽均设有外置蒸汽冷却器进行过热度跨级利用的特点,基于等效热降理论,经过严格的理论分析和数学推导,得出了各加热器名义和真实抽汽等效热降及抽汽效率的计算方法,给出了二次再热超临界机组热力系统经济性的局部定量分析法则,形成了一套完整的经济性定量计算方法。利用该模型仅用3个公式即可以方便、快捷、准确地计算出热力系统发生局部调整和变化时机组经济性指标的变化,为此类机组的经济性分析和节能诊断提 供了一种简捷、准确的定量方法。并通过实例计算验证了该模型的可行性和准确性。更多还原

【Abstract】 Based on the theory of 揺quivalent enthalpy drop?and aiming at the supercritical pressure unit with double reheat cycles, a set of mathematical models for calculating 揺quivalent enthalpy drop?and efficiency of regeneration cycle are established. Through a strict theoretical analysis and mathematical formulation, a calculating method for the equiva-lent enthalpy drop of nominal and real extractions is obtained, and the principles for local quantitative analysis of the econo-mics for the thermal system of supercritical pressure unit with double reheat cycle are given. A set of complete quantitative calculating methods is formed in which by using the model, only 3 equations are needed and result in a fast and convenient calculation the economics changes of the system during a local adjustment and changes of the criterion, and provides an accurate method for the economics analysis and energy-saving diagnosis for such kind of units. A practical case study has proved the feasibility and accuracy of the model.更多还原