动量方程瞬态项对单相受热管仿真模型的影响  

Study on Effect of Neglecting Transient Terms of Momentum Equations on Simulation Models of Single Phase Heated Tubes

作　　者：康英伟[1,2] 王亚楠[1,2] 彭道刚[1,2] 郑鹏远[1,2] 杨平[1,2] 

机构地区：[1]上海电力学院自动化工程学院,上海200090 [2]上海发电过程智能管控工程技术研究中心,上海200090

出　　处：《系统仿真学报》2017年第5期1033-1040,共8页Journal of System Simulation

基　　金：上海市"科技创新行动计划"国际科技合作项目(15510722100);上海市自然科学基金(15ZR 1418600)

摘　　要：给出了一个单相受热管模型,以某电站锅炉过热器受热管为对象,通过仿真研究了忽略动量方程瞬态项对模型性能的影响。研究发现,忽略动量方程瞬态项会显著降低单相受热管模型的动态精度,在各种阶跃扰动下忽略动量方程瞬态项都会使模型焓-温通道的动态响应速度加快近4倍,在入口蒸汽流量阶跃扰动下忽略动量方程瞬态项会改变模型压力-流量通道的动态特性类型;忽略动量方程瞬态项所换来的计算耗时下降不足7%;并且忽略瞬态项后模型保持数值稳定的能力也有所降低。A model of single phase heated tubes was presented, based on which the effect of neglecting transient terms of momentum equations on model performance was investigated by simulating a heated tube of the superheater of a power plant boiler It is found that neglecting the transient terms of momentum equations can significantly decrease the dynamic accuracy of the model,＂ under various step disturbances, neglecting the transient terms of momentum equations can speed up the dynamic response of the enthalpy-temperature channel of the model nearly 4 times; under the step disturbance of the inlet steam flux, neglecting the transient terms of momentum equations can change the type of dynamic characwristics of the pressure-flow channel of the model,＂ whereas the corresponding decrease of computational consuming time is less than 7%; moreover, the ability to keep numerically stable also decreases.

关 键 词：单相受热管 过热器 仿真模型 动量方程 瞬态项 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]