园区供热管网泄漏工况建模及分析

为提高供热系统的安全性及故障诊断系统的准确性，依据图论理论对某园区供热管网泄漏工况进行水力特性建模，并通过管网能量平衡方程求解不同工况下的用户室内温度.分析了不同泄漏工况对供热管网水力工况和热力工况的影响.研究结果表明:供热管网中任意点发生泄漏故障均会对系统水力特性产生影响，并且泄漏点距离循环水泵越近对供热系统管段流量影响越大；供热管网水力特性的变化将会对热力特性产生耦合影响.本研究可为供热管网泄漏事故预判及故障诊断等提供参考依据.

Modeling and Analysing Leakage of Heating Pipe Network in Park

In order to improve the safety of heating system and the accuracy of fault diagnosis system， hydraulic characteristics of a park’s heating pipe network under leakage conditions were modeled based on the graph theory， and the indoor-user temperature under different conditions was solved from the energy-balance equations of the pipe network. The effects of different leakage conditions on hydraulic and thermal characteristics of heating network were analyzed. The results show that the leakage faults at any point in heating pipe network will affect hydraulic characteristics of the system， and the closer the leakage point is to the circulating water pump， the greater impact on the flow of heating system pipe. Moreover， the change of hydraulic characteristics of heating pipe network can cause a coupling effect on thermal characteristics. The results can provide a guidance for the prediction of leakage accidents and fault diagnosis of heating pipe networks.