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本文在电厂蒸汽循环的循环函数式“加热单元”理论的基础上，依据加热器进出口疏水量之间的关系，提出了一种新的分析火电厂回热系统热经济性的递推计算法．该方法简化了计算公式，更方便于编制通用性较强的计算机程序，并通过实例证明该递推模型是正确的．
Based on the circulating function “heating unit” theory of power plant steam cycle and based on the relationship between the inlet and outlet water heaters, a new recursive method to analyze the thermal economy of the heat recovery system in thermal power plants . The method simplifies the calculation formula and facilitates the compilation of the universal computer program. The example shows that the recursive model is correct.