基于动态仿真的热网运行安全分析与结构优化

Safety Analysis and Structural Optimization of District Heating System Based on Dynamic Simulation Model

为了保证长输供热管网运行的安全性和可靠性,从质量守恒方程和动量守恒方程出发,结合图论和基尔霍夫定律,建立了供热管网动态水力仿真模型,并在APROS(Advanced Process Simulation Software高级过程仿真软件)平台中进行了仿真与模型验证,进一步针对北方某城市集中供热系统,对其停泵事故下的动态水力过程进行分析研究。结果表明:现有条件下中继泵站或者热源处不同数量水泵骤停工况较为安全,但是所有水泵骤停工况下安全风险较高,其中中继泵站进口压力水力变化过程中的最高压力为1.51 MPa,大于1.3 MPa的安全要求,已经超压,存在严重的水锤的风险。进而利用viHeating智慧供热平台进行热网结构安全性优化设计,新增了一台中继泵站,并针对极寒天气工况进行仿真分析。仿真验证表明,这一设计优化可解决原有所有水泵骤停工况下的全网安全性问题。

In order to ensure the safety and reliability of long-distance heating network, the dynamic hydraulic simulation model of heat supply network is established based on the mass conservation equation and momentum conservation equation, combined with graph theory and Kirchhoff law, and the simulation and model verification are carried out in APROS platform. Furthermore, the dynamic hydraulic process of the central heating system in a northern city was analyzed. The results show that under the existing conditions, the sudden stop of different number of pumps in the relay pump station or heat source is safer, but the safety risk of all pumps is higher. Among them, the maximum pressure in the process of hydraulic change of inlet pressure of relay pump station is 1.51 MPa >1.3 MPa, which has overpressure and serious risk of water hammer. To mitigate the impact of water hammer, this study further uses viHeating smart heating platform to carry out structural enhancment. The result indicates that a booster pump is required. We justify the necessity of booster pump installation through dynamic simulation under extreme cold condition. The comparison results show that such enhancement solves the issue of pump failure.