College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, China.
Environmental Defense Fund, Surrey, Canada.
Environ Sci Pollut Res Int. 2022 Oct;29(47):71949-71957. doi: 10.1007/s11356-022-20929-0. Epub 2022 May 24.
Methane, as the second most emitted greenhouse gas (GHG), has a warming potential of approximately 86 times that of carbon dioxide within 20 years. Quantifying methane emissions is helpful to the country's emission reduction efforts. However, currently, there is a lack of measurement data of methane emissions from natural gas fueling stations in China. In this study, a downwind quantification approach was employed to directly measure the methane emissions of nine compressed natural gas (CNG) fueling stations in East China according to the Environmental Protection Agency's Other Test Method 33A (OTM 33A). Moreover, methane concentrations were also measured near the nozzle of the refueling dispenser and the process equipment in the station. The methane emissions of the nine stations lied within the range of 0.11-0.83 kg/h, and the distribution of the emission rate was skewed. It was found that the emissions from gas fueling stations could be divided into intermittent emissions and continuous emissions, of which the intermittent emissions were the main source of methane.
甲烷作为第二大温室气体（GHG），在 20 年内的增温潜势约为二氧化碳的 86 倍。量化甲烷排放有助于国家的减排工作。然而，目前中国缺乏天然气加气站甲烷排放量的测量数据。在本研究中，根据美国环保署的其他测试方法 33A（OTM 33A），采用下风量化方法直接测量了华东地区 9 个压缩天然气（CNG）加气站的甲烷排放。此外，还在加气枪嘴附近和站内工艺设备处测量了甲烷浓度。9 个站点的甲烷排放量在 0.11-0.83kg/h 之间，排放率的分布呈偏态。结果表明，加气站的排放可以分为间歇排放和连续排放，其中间歇排放是甲烷的主要来源。
