超超临界直流炉核心模型的建立与仿真分析

Establishment and Simulation Analysis of Core Model for Ultra-supercritical Once-through Boiler

为了系统地研究超超临界直流炉蒸汽发生器的动态特性,以泰州电厂1000MW超超临界直流炉为研究对象,通过合理简化和机理分析,采用非线性集总参数移动边界的方法,建立了蒸汽发生器的数学模型。建模过程中,针对相变点的位移问题,将相变点的位置作为独立变量置入模型,成功解决了超超临界工况下大扰动动态仿真所面临的问题。通过二次建模,使计算机的仿真更便于实现。在仿真模型的基础上,针对亚临界和超超临界两种典型工况,进行动态仿真,试验结果与实际系统的动态特性相符。通过模型的建立,为超超临界直流炉系统工程分析和大规模火电厂仿真机的开发打下了良好的基础。

To study dynamic characteristics of ultra-supercritical once-through boiler steam generator easily and systematically,through reasonable simplification and mechanism analysis,this paper took the nonlinear lumped-parameter moving boundary method to create the mathematical model of ultra-supercritical once-through boiler steam generator,based on specific features of 1000MW ultra-supercritical once-through boiler in Taizhou power plant.In the modeling process,aiming at the displacement problem of phase transition point,this paper took the phase transition point as independent variables of the model,to solve the problem of large disturbance dynamic simulation under ultra-supercritical condition.Then the second model was carried out to facilitate the computer simulation.And aiming at subcritical condition and ultra-supercritical condition,the new simulation model was implemented for the dynamic characteristics test.The simulation result is consistent with the dynamic characteristics of the actual system.The establishment of this model makes good foundation for the system engineering analysis of ultra-supercritical once-through boiler and the development of large-scale power plant simulator.