In order to better understand the dynamic characteristics of the dual-pressure natural-circulation gas turbine heat recovery steam generator,the lumped parameter method is used in this article to build a dynamic simulation model of a dual-pressure naturalcirculation gas turbine heat recovery steam generator in Matlab/Simulink according to the principle and structural characteristics of the boiler,with the tube bank heat transfer in full consideration.The dynamic response characteristics of the main parameters are simulated with 10％ perturbation of engine exhaust gas flow and its temperature,and the high-pressure feeding water flow.The results indicate that the engine exhaust gas temperature influences the steam parameters the most,the exhaust gas flow has less effect on them,high-pressure feeding water flow the least.The simulation results fit the practical operation data well,meaning that the model has high precision and good versatility,and can provide a reasonable technical reference for the same type boilers on thermal operation.%为深入了解自然循环双压燃气轮机余热锅炉动态特性,基于Matlab/Simulink仿真系统,根据锅炉工作机理和结构特性,并充分考虑管束传热的影响,采用集总参数法建立了余热锅炉动态仿真数学模型,分析变工况运行时,燃气轮机排气温度、排气流量、高压给水流量分别扰动10％的条件下,锅炉主要参数的动态响应特性.结果表明,燃气轮机排气温度变化对余热锅炉各热力参数的影响最大,排气流量的影响次之,高压给水流量对蒸汽参数影响很小.仿真结果与锅炉实际运行数据基本一致,表明模型具有较高的精度和良好的通用性,能正确反映锅炉的动态特性,可为同类型锅炉热态运行提供合理的技术参考.
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