关中地区民用燃料燃烧源县级甲烷排放清单估算

Based on the methane emission factor obtained in the field and the activity data of residential fuel combustion，the county-level methane emission inventories of four types of solid fuels combustion in the Guanzhong region in 2022 were established in this study. The estimation results showed that the total methane emission from residential fuel combustion sources in Guanzhong region was 2.18×10⁴ t in 2022 with the orders of Weinan City > Xianyang City > Xi’An City > Baoji City > Tongchuan City. Maize straw was the largest contributor to methane in all residential combustion sources due to its larger consumption，accounting for 62.4%~82.6% of total methane from these sources. The emission factor of methane from anthracite coal combustion is 2~3 orders of magnitude lower than that of other fuels，and thus contributed less than 1% to the total methane. The differences in emission factors of the fuels and county-level solid fuel consumption patterns had led to differences in county-level methane emission inventories. Fuping county，Lintong district，and Pucheng county were the largest methane emission areas，accounting for 5.36%，5.32%，and 4.79% of the total methane，respectively. The methane emission reduction rate of biomass briquetting in Guanzhong was only 14.7%，while the use of briquette coal and improved stoves resulted in methane emission reduction efficiencies as high as 76.4%，which was more meaningful for implementation. The county-level methane emission inventory established in this study has reduced the uncertainty and improved the resolution of data，and laid a solid foundation for carbon reduction in the Guanzhong Plain.