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出于开发高精度、低计算量且便于使用的仿真模型的需要,建立了锅炉单相受热管的三层嵌套模型并对其进行了研究。基于传递函数泰勒级数展开方法的理论分析表明,对于入口焓、入口流量及热流量的扰动,三层嵌套模型分别以三阶、一阶和二阶精度逼近于分布参数模型。以600 MW亚临界压力锅炉过热器为对象的仿真结果表明,三层嵌套模型的动态响应与分布参数模型非常吻合,在3种扰动下,三层嵌套模型的性能相比二层嵌套模型均有十分显著的改善。三层嵌套模型为实时全工况仿真和控制系统仿真提供了一种具有竞争力的模型选择。
For the purpose of developing a high-precision, low-computational and user-friendly simulation model, a three-layer nested model of boiler single-phase heat pipe was established and studied. The theoretical analysis based on Taylor series expansion of transfer function shows that the three-layer nested model approaches the distribution parameter model with the third-order, first-order and second-order accuracy respectively for the disturbance of inlet enthalpy, inlet flow and heat flux. The simulation results of a 600 MW subcritical pressure boiler superheater show that the dynamic response of the three-layer model is in good agreement with the distributed parameter model. Under the three kinds of perturbations, the performance of the three-layer model is lower than that of the two-layer model Models have a very significant improvement. The three-level nesting model provides a competitive model choice for real-time full-condition simulation and control system simulation.