蒸汽管道用户端热力水力响应仿真

Thermal-Hydraulic Response Simulation of User End of Steam Pipeline

综合考虑蒸汽在管道中流动过程的热力、水力耦合因素以及动态特性,建立基于Modelica语言的单根蒸汽管道输送动态仿真模型。以上海地区某化工园区某段架空蒸汽管道的热源蒸汽运行参数(压力、温度、质量流量)作为模型仿真输入,仿真计算用户蒸汽运行参数(压力、温度),将仿真值与实测值进行对比,验证仿真模型的计算精度。利用仿真模型对用户端的热力响应、水力响应进行研究。计算精度验证结果表明,仿真值与实测值比较吻合,用户蒸汽温度仿真值与实测值的最大相对误差为3. 1%,用户蒸汽压力仿真值与实测值的最大相对误差为-0. 6%,仿真模型的计算精度可满足工程要求。对于热力响应,用户蒸汽温度的响应明显滞后于热源蒸汽温度变化,蒸汽热网具有比较强的热惯性。对于水力响应,用户蒸汽压力对热源压力的变化响应迅速,用户蒸汽质量流量对热源质量流量的变化响应迅速。

A single steam pipeline transportation dynamic simulation model based on Modelica language was established by comprehensively considering the thermal-hydraulic coupling factors and dynamic characteristics of steam flow in the pipeline. The steam operation parameters( pressure,temperature and mass flow) of a certain section of overhead steam pipeline in a chemical industry park in Shanghai were taken as the model simulation input,the steam operation parameters( pressure and temperature) of the user were simulated and calculated. The simulation values were compared with the measured values to verify the calculation accuracy of the simulation model. The thermal response and hydraulic response of the user end were studied by simulation model. The results of calculation accuracy verification show that the simulation values are in good agreement with the measured values,and the maximum relative error between the simulated value and the measured value of user steam temperature is 3. 1%,while the maximum relative error between the simulated value and the measured value of user steam pressure is-0. 6%. The calculation accuracy of the simulation model can meet the engineering requirements. For thermal response,the response of user steam temperature obviously lags behind the change of heat source steam temperature,and the steam heat network has strong thermal inertia. For hydraulic response,the user steam pressure responds quickly to the change of heat source pressure,and the user steam mass flow responds quickly to the change of heat source mass flow.