中文摘要：

集总参数模型建模简单,计算量小,但其精度低,不能较好地反映回热加热器的动态特性.因此,本文采用分布参数模型、嵌套模型、链式模型、分段集总模型等方法对回热加热器各工况进行仿真研究,主要包括入口焓扰动、入口流量扰动和入口热流量扰动.结果表明：链式模型精度最高;而通过优化分段数的分段集总模型能够改进集总参数法的不足;选择合适的代表点可改进集总参数模型的精度.

英文摘要：

However modeling simply and calculating fast the lumped-parameter model is,it has disadvantages of low precision and could not accurately reflect the dynamical characteristics of the regenerative feed-water heater.Therefore,distributed-parameter model,nested structure model, chain structure model and different section-parameter models etc were adopted to simulate various disturbance conditions happened in feed water heater.Entrance enthalpy disturbance,inlet flow disturbance and entry heat flow disturbance were mainly considered.The results show that：chain structure model has the highest precision,and through optimizing segments,section-parameter model can make up the defects of lumped-parameter model.At the same time,choosing appropriate representative points can also improve the precision of lumped-parameter model.