户内燃气表安装通气过程温室气体排放分析

Analysis of Greenhouse Gas Emission during Gas Supply after Installation of Indoor Gas Meters

围绕我国居民用户户内燃气表安装通气过程温室气体排放数据空白这一关键问题,采用实测方法,获取通气置换过程温室气体排放相关数据,分析温室气体排放量统计规律,计算温室气体排放量、甲烷排放因子、二氧化碳排放因子。研究结果表明:新增天然气居民用户燃气表安装通气过程甲烷排放量服从Gamma分布,甲烷排放量分布区间为(0.000,0.020]kg/户,甲烷排放量在(0.002,0.008]kg/户的用户数量占比达60.0%。二氧化碳排放量服从对数正态分布,二氧化碳排放量分布区间为(0.00,0.09]kg/户,二氧化碳排放量在(0.02,0.04]kg/户区间的用户数量占比达54.1%。甲烷排放因子、二氧化碳排放因子分别为0.006 kg/户、0.033 kg/户。估计全国2007—2021年燃气表安装通气用户甲烷累计排放量达到113.874 t,二氧化碳累计排放量为626.308 t。

Focusing on the key problem of gap in greenhouse gas emission data during gas supply after installation of indoor gas meters for residential users in China,the actual measurement method was used to obtain the relevant greenhouse gas emission data during gas supply and purging process,analyze the statistical law of greenhouse gas emissions,and calculate the greenhouse gas emissions,methane emission factors and carbon dioxide emission factors.The research results show that the methane emissions during gas supply after installation of gas meters for new natural gas residential users follow a Gamma distribution,the distribution range of methane emissions is(0.000,0.020]kg/household,and the proportion of users with methane emissions in the range of(0.002,0.008]kg/household is 60.0%.The carbon dioxide emissions follow a lognormal distribution,the distribution range of carbon dioxide emissions is(0.00,0.09]kg/household,and the proportion of users with carbon dioxide emissions in the range of(0.02,0.04]kg/household is 54.1%.The methane emission factors and carbon dioxide emission factors are 0.006 kg/household and 0.033 kg/household,respectively.It is estimated that from 2007 to 2021,the cumulative methane emissions from gas meter installation and gas supply users in China reached 113.874 tons,and the cumulative carbon dioxide emissions were 626.308 tons.