A METHOD FOR ANALYSIS THE ECONOMICS OF A THERMAL SYSTEM IN A SUPERCRITICAL PRESSURE POWER UNIT WITH DOUBLE REHEAT CYCLES

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.