在中游天然气设施中使用设施空中测量报告甲排放库存
Jenna A Brown1, Matthew R Harrison2, Tecle Rufael2
1Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80524, United States.
Environmental science & technology
|September 20, 2023
概括
从上向下进行的甲排放测量显示,与天然气设施的传统自下而上的库存存在重大分歧. 提高准确性需要加强现场诊断和进一步开发自上而下的方法.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 能源系统 能源系统
背景情况:
- 越来越多的关注来自天然气供应链的温室气体 (GHG) 排放,特别是甲.
- 传统的自下而上 (BU) 库存方法用于估计排放,面临着对其准确性的审查.
- 需要通过独立的测量技术进行有效的排放量化.
研究的目的:
- 将两个独立的自上而下的方法 (TD) 的全设施排放估计值与运营商生成的每日库存进行比较.
- 评估TD方法之间的一致性,以及在中游天然气设施的TD估计和运营商库存之间的一致性.
- 确定改善排放清单和TD测量技术的影响.
主要方法:
- 使用了两个独立的自上而下 (TD) 全设施测量技术 (空载,卫星或无人机).
- 收集了美国15个中游天然气设施的数据.
- 将TD估计与设施运营商使用综合方法编制的当前每日库存进行了比较.
主要成果:
- 两种TD方法之间有限的统计协议 (在28个配对测量中的2个).
- 在大多数比较中,运营商的库存估计的甲排放量远低于TD估计的甲排放量 (40分之43).
- 在大多数设施中,在DT方法之间以及在DT估计和运营商库存之间观察到实质性的分歧.
结论:
- 提高排放清单准确性需要加强现场诊断查和全面的源测量.
- 整个设施的自上而下的测量方法需要对复杂的中游基础设施进行进一步的验证,表征和改进.
- 目前的库存实践可能低估了天然气供应链中的甲排放.
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