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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >A study on a real-time leak detection method for pressurized liquid refrigerant pipeline based on pressure and flow rate
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A study on a real-time leak detection method for pressurized liquid refrigerant pipeline based on pressure and flow rate

机译：基于压力和流量的液态制冷剂管道实时泄漏检测方法的研究

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Leakage from pressurized liquid ammonia pipeline has been a serious problem in large commercial cold storages because it might release large amount of liquid ammonia and without safety supervision in daily operations. The present paper shows a detection method for a pressurized liquid ammonia pipeline with a leak. The variations of pressure, flow rate and pressure difference profile are studied. A leak indicator (sigma), proposed with the one-dimensional steady-state flow model, is used to detect the leak occurrence by comparing it with a threshold value (sigma(Le)). A locating algorithm based on pressure difference profile along the pipeline is also proposed, which has considered the effect of the static pressure increase at the leak point. Experiments on different leak positions and ratios from liquid R22 and ammonia pipelines are carried out to validate this method. It is found that, with a relatively low false alarm rate (as three percent), the minimum detectable leak ratio reached 1% for the R22 pipeline and 4% for the ammonia pipeline. The locating errors are between -27% similar to 17% for R22 pipeline and -27% similar to 27% for ammonia pipeline. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在大型商业冷藏库中，加压液氨管道的泄漏一直是一个严重的问题，因为它可能释放大量液氨，并且在日常操作中没有安全监管。本文介绍了一种加压的液氨管道泄漏的检测方法。研究了压力，流量和压差分布的变化。与一维稳态流模型一起提出的泄漏指示器（sigma）用于通过与阈值（sigma（Le））比较来检测泄漏的发生。提出了一种基于压力差分布的管道定位算法，该算法考虑了泄漏点静压增加的影响。通过对来自液体R22和氨管道的不同泄漏位置和泄漏率的实验进行了验证。结果发现，在误报率相对较低（为3％）的情况下，R22管道的最小可检测泄漏率达到1％，氨管道的最小可检测泄漏率达到4％。定位误差在-27％（类似于R22管道的17％）和-27％（类似于27％）的氨管道之间。 （C）2015 Elsevier Ltd.保留所有权利。

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