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首页> 外文期刊>Environmental Science & Technology >Vehicle-Based Methane Surveys for Finding Natural Gas Leaks and Estimating Their Size: Validation and Uncertainty
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Vehicle-Based Methane Surveys for Finding Natural Gas Leaks and Estimating Their Size: Validation and Uncertainty

机译：基于车辆的甲烷调查，以发现天然气泄漏并估算泄漏量：验证和不确定性

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摘要

Managing leaks in urban natural gas (NG) distribution systems is important for reducing methane emissions and costly waste. Mobile surveying technologies have emerged as a new tool for monitoring system integrity, but this new technology has not yet been widely adopted. Here, we establish the efficacy of mobile methane surveys for managing local NG distribution systems by evaluating their ability to detect and locate NG leaks and quantify their emissions. In two cities, three-quarters of leak indications from mobile surveys corresponded to NG leaks, but local distribution companies' field crews did not find most of these leaks, indicating that the national CH4 activity factor for leaks in local NG distribution pipelines is underestimated by a factor of 2.4. We found the median distance between mobile-estimated leak locations and actual leak locations was 19 m. A comparison of emission quantification methods (mobile-based, surface enclosure, and tracer ratio) found that the mobile method overestimated leak magnitude for the smallest leaks but accurately estimated size for the largest leaks that are responsible for the majority of total emissions. Across leak sizes, mobile methods adequately rank relative emission rates for repair prioritization, and they are easily deployed and offer efficient spatial coverage.
机译：管理城市天然气（NG）分配系统中的泄漏对于减少甲烷排放和昂贵的废物非常重要。移动测量技术已经成为监视系统完整性的新工具，但是这种新技术尚未得到广泛采用。在这里，我们通过评估甲烷探测和定位天然气泄漏并量化其排放量的能力，来建立移动甲烷调查在管理本地天然气分配系统方面的功效。在两个城市中，移动调查显示的四分之三的泄漏指示与天然气泄漏相对应，但是当地配电公司的现场工作人员并未发现这些泄漏中的大多数，这表明，当地天然气配送管道泄漏的全国CH4活度因子被低估了系数为2.4。我们发现，移动估计的泄漏位置与实际泄漏位置之间的中位距离为19 m。通过比较排放量化方法（基于移动的，基于表面的外壳和示踪剂的比率），移动方法高估了最小泄漏的泄漏量，但准确估计了最大泄漏的泄漏量，这些泄漏占总排放量的大部分。在各种泄漏尺寸下，移动方法可以适当地对相对排放率进行排序，以进行维修优先级排序，并且易于部署并提供有效的空间覆盖范围。

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  • 来源
    《Environmental Science & Technology》 |2018年第20期|11922-11930|共9页
  • 作者

    Weller Zachary D.; Roscioli Joseph R.; Daube W. Conner; Lamb Brian K.; Ferrara Thomas W.; Brewer Paul E.; von Fischer Joseph C.;

  • 作者单位

    Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA;

    Aerodyne Res Inc, Billerica, MA 01821 USA;

    Aerodyne Res Inc, Billerica, MA 01821 USA;

    Washington State Univ, Dept Civil & Environm Engn, Lab Atmospher Res, Pullman, WA 99164 USA;

    GHD Serv Inc, Niagara Falls, NY 14304 USA;

    Smithsonian Environm Res Ctr, POB 28, Edgewater, MD 21037 USA;

    Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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