中冷回热循环燃气轮机动态仿真研究

Dynamic Simulation of Intercooled Regenerated Cycle Gas Turbines

中冷回热循环燃气轮机是一个高度非线性的热动力系统,其动态性能由转子的转动惯性、容积的容积惯性和换热器的热惯性所决定。根据中冷回热循环燃气轮机的各部件特性,利用M atlab/S im link仿真平台,采用模块化建模法,对中冷回热循环燃气轮机进行动态仿真。通过实例,对中冷回热循环燃气轮机的动态性能进行分析,并与简单循环燃气轮机仿真结果进行比较。结果表明,换热器的时间常数较大,其热惯性对机组的动态性能影响较大,在仿真过程中不能忽略,且机组平衡时间与换热器时间常数有关,时间常数愈大,达到平衡所需时间愈长。

An intercooled regenerated cycle gas turbine is a high nonlinearity thermo - motive system, and its dynamic performance is decided by rotating inertia of rotors, volume inertia of volumes, and heat inertia of heat exchangers. Base on the components characteristic, the dynamic behaviors of intercooled regenerated cycle gas turbines are simulated by blocking modeling numerical method under Matlab/Simulink environment in this paper. The dynamic behaviors of intercooled regenerated cycle gas turbines are analyzed by an example, and are compared with simulation results of simple cycle gas turbines. The research result shows that the time - constant of heat exchanger is very big. The heat inertia is an important factor which affects dynamic behaviors of system, and can not be neglected in the simulation of intercooled regenerated cycle gas turbines. The time - constant of heat exchanger will affect the time of system balance and the larger the time - constant, the more the time of system balance.