Study on the Self Heating Effect and Multi-element Gas Adsorption of Coal Body in Goaf
In response to the complex coupling mechanism between coal spontaneous combustion and gas explosion in goaf areas,through laboratory experiments and theoretical analysis,the competitive adsorption and desorption characteristics of various types of gases during coal body spontaneous combustion process are studied.The laws of coal body spontaneous combustion and gas escape under gas containing conditions in goaf are analyzed,and the regional dynamic distribution characteristics of multi-component gases and temperatures in goaf are obtained.The results indicate that the spontaneous combustion temperature of coal in goaf is an important factor affecting changes in gas density and gas accumulation.The ventilation air leakage quantity in goaf is related to the intensity of coal spontaneous combustion and the range of methane accumulation in goaf;In the early stage of coal body spontaneous combustion,the distribution of oxygen and methane in the goaf is less affected by temperature.As the temperature increases,the gas in coal rapidly desorbs,and the adsorbed nitrogen also exhibits the same trend of change.The higher the gas concentration in the atmosphere,the more CO quantity is generated from coal oxidation.After adding methane to the airflow,CO and CO2 will gradually form under high temperature conditions.This study provides theoretical support for the establishment of early warning indicators for coal and gas disasters in goaf.
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