南京市某CNG加气站大气甲烷体积分数的研究及气象要素对其影响
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摘要
CNG即压缩天然气是重要的一类人为CH_4排放源,为探明CNG加气站CH_4扩散体积分数及其与气象要素之间的相关性,针对南京浦口区某加气站采用LGR (便携式温室气体分析仪)与气相色谱仪在加气的不同环节对CH_4体积分数进行观测。本文通过南京市某CNG加气站附近CH_4泄露时CH_4体积分数的测量数据,分析加气站加气过程中的不同环节CH_4的体积分数变化及其与气象要素(温度、风速、湿度)的关系。进行观测,并测量了同期不同的气象要素(温度、湿度、风速)。结果表明:加气站确实存在大量CH_4泄露,此CNG加气站CH_4平均体积分数与背景值的差值维持在0.7×10~(-6),尤其在在加气枪拔出瞬间,卸载气体体积分数会达到422.59×10~(-6);CH_4泄露受到气象要素的影响,泄露体积分数与温度、风速存在明显的负相关,且达到极显著水平(|R|=0.866>|R_(0.01)|),与湿度不存在相关性。
CNG, compressed natural gas, is an important source of anthropogenic CH_4 emissions. In order to find out the correlation between CH_4 concentration of CNG filling station and meteorological elements, a LGR(portable greenhouse gas analyzer) and gas chromatograph were used to observe the CH_4 concentration at different refueling links of a gas filling station in Pukou District, Nanjing, and different meteorological elements(temperature, humidity, wind speed) during the same period were measured. The results show that there is a large amount of CH_4 leakage in the gas station. The difference between the average concentration of CH_4 in the CNG filling station and the background concentration was maintained at 0.7 ×10~(-6),especially at the moment when the gas gun is pulled out, the unloading gas concentration reached 422.59×10~(-6). Also, the CH_4 leakage is affected by different meteorological factors, the leakage concentration has a significant negative correlation with temperature and wind speed, and reaches a extremely significant level(|R|=0.866>|R_(0.01)|), and there is no correlation with humidity.
CNG, compressed natural gas, is an important source of anthropogenic CH_4 emissions. In order to find out the correlation between CH_4 concentration of CNG filling station and meteorological elements, a LGR(portable greenhouse gas analyzer) and gas chromatograph were used to observe the CH_4 concentration at different refueling links of a gas filling station in Pukou District, Nanjing, and different meteorological elements(temperature, humidity, wind speed) during the same period were measured. The results show that there is a large amount of CH_4 leakage in the gas station. The difference between the average concentration of CH_4 in the CNG filling station and the background concentration was maintained at 0.7 ×10~(-6),especially at the moment when the gas gun is pulled out, the unloading gas concentration reached 422.59×10~(-6). Also, the CH_4 leakage is affected by different meteorological factors, the leakage concentration has a significant negative correlation with temperature and wind speed, and reaches a extremely significant level(|R|=0.866>|R_(0.01)|), and there is no correlation with humidity.
引文
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[2]IPCC.IPCC Fourth Assessment Report(AR4)[M].Cambridge:Cambridge University Press,2007.
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[4]陈子如,夏云峰,姚三三,等.LNG/LCN加气蒸发气体回收利用可行性的探讨[J].石油库与加油站,2014,6(23):11-18.
[5]熊杰,韩佳昊,郭云飞,等.LNG和CNG加气站甲烷泄漏研究进展[J].能源研究与管理,2018(2):4-8.
[6]张雪,胡凝,刘寿东,等.南京城市交通甲烷排放特征[J].环境科学,2017,38(2):469-475.
[7]颜录通.CNG加气站天然气泄漏分析及防范[J].中国石油和化工标准与质量,2013,34(3):225.
[8]白永锋.浅谈CNG加气站的供销气差率[J].城市燃气,2010(6):32-34.
[9]谢季男.CNG场站加气软管余气回收利用实践[C]//中国土木工程学会燃气分会.2016中国燃气运营与安全研讨会论文集.天津:《煤气与热力》杂志社有限公司,2016.