Study on Daily-Scale Emission Characteristics of Spontaneous Combustion Gases in Shallow Soil of Coal Fire Areas

The development of coalfield fire areas not only leads to the wastage of coal resources but also results in the emission of a large quantity of spontaneous combustion gases, further exacerbating air pollution. Monitoring the spontaneous combustion gas products in coalfield fire areas is crucial. These gases are released to the surface through surface fissures and shallow soil layers. However, current monitoring methods for carbon emissions in coalfield fire areas often overlook the spontaneous combustion gas emissions from shallow soil regions. Therefore, this study focuses on CO2 and CO, which are the primary components in spontaneous combustion gases, and employs a self-developed multi-zone gas concentration monitoring system for coalfield fire areas. This system is used to capture the temporal variation patterns of spontaneous combustion gas concentrations and related parameters in shallow soil and fissure regions. The study further investigates the influence of surface meteorological factors on gas emissions in these areas, revealing the relationship between the gas emission patterns in shallow soil and fissure regions from both high-frequency and low-frequency data perspectives. The findings provide important theoretical insights for the rational assessment and improvement of carbon emission evaluations in coalfield fire areas.