准确判断泄漏速率对控制泄漏和计算应急区域范围非常关键,但现有天然气管道泄漏速率计算多在稳态的持续泄漏或紧急关断(ESD)阀同时关闭的动态泄漏假设下得到结果,与实际存在差别.本文结合管道过程,构建基于HYSYS的天然气集输管道泄漏等效模型,就ESD阀关断顺序和延迟对管道流量和泄漏速率的影响进行了模拟分析.结果表明,随着泄漏孔径的增加,管道内将出现逆流现象,管道ESD阀关断延迟顺序对小孔泄漏和大孔泄漏速率的控制存在明显不同的影响,对释放持续时间的影响较小.%The leaking rate is crucial for the determination of emergency zone and leakage control measures, but most of the existing calculation methods were based on the conditions of steady leaking or dynamic leaking after a simultaneous closure of emergency shut down (ESD) valves. Hence, an equivalent model of gas leakage combined with process of natural gas pipeline is established by using HYSYS simulative software, and the leaking rates in steady and dynamic states are calculated under conditions of closure delays for ESD valves. Results showed that the closure delay of ESD valves has obvious effects on the leaking rates and the flow rates in pipeline, and countercurrent flows would occur in pipeline with the increase in the release hole size. The closure delay of ESD valves has little effect on release duration.
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