联合循环中底循环系统的动态仿真模型

Dynamic Simulation Models for Bottoming Cycles of Combined Cycle Units

根据底循环系统工作机理和特性,以能量和质量守恒原理为基础,详细论述了非补燃式三压再热自然循环余热锅炉、汽轮机、凝汽器、离心式水泵的模型算法,并结合其它相关模块算法(如凝结水预热器、流体网络、容积模块算法等),以M701F级联合循环机组为仿真对象,用模块化方法建立了完整的底循环系统动态数学模型。仿真试验表明:所建立的数学模型能够正确反映对象的动态和静态特性,整体模型运算收敛快,可为联合循环机组仿真系统的开发和底循环控制系统的设计与分析提供良好的理论模型。

A real-time simulation model for a bottoming cycle of a combined cycle unit is being developed with the modular modeling method. Based on the mass and energy conservation principle, the model algorithms of the natural circulating Steam Generator （HRSG） without supplementary firing, the steam turbine, the condense and the centrifugal pump of a triple-pressure reheating system＇s are described in detail, in accordance with the working principle and characteristics of the bottoming cycle. Combining these algorithms with relevant modular algorithms （for example of condensate water pre-heaters, fluid networks, containers etc... ）, a complete dynamic simulation model of a bottoming cycle system has been constructed by taking the M701F Class combined cycle unit of Beijing Jingfeng Thermal Power Co., Ltd as the object of simulation. Simulation tests show that the mathematical model developed can correctly simulate transient and static processes of the simulated object. These models, concatenated as a whole make calculation, converge steadily, provide correct results and may thus serve as satisfactory theoretical models for the development of simulation systems of combined cycle units, as well as for designing and analyzing control systems of their bottoming cycles. Figs 3, table 1 and refs 12.