Research on fire prevention and extinguishing parameters of plugging and injection in goaf of ultra-thick coal seams based on response surface method
Wang Anjun
Ren Hao
Peng Baoshan
Sun Dasen
Shi Guoqing
Abstract：Due to the high coal loss rate and large goaf space in the fully-mechanized caving face of ultra-thick coal seams,the risk of sponta-neous combustion in the goaf is high.In order to better prevent the spontaneous combustion of goaf during the period of ultra-thick coal seam fully-mechanized caving working face,taking Zhundong No.2 Mine as an example and a three-dimensional numerical model of multi field cou-pling in goaf was established.The distribution law of gas and heat fields in goaf was numerically simulated,and the model was verified through on-site measurement data.On this basis,the optimal technical parameters of wind curtain plugging and nitrogen injection collaborative fire pre-vention and extinguishing measures were studied using a combination of response surface method and numerical simulation.The results showed that when the nitrogen injection position was 20 m,the nitrogen injection rate was 1 260 m3/h,and the length of the wind curtain on the intake airflow side was 120 m and the length of the wind curtain on the return airflow side was 120 m,the plugging and injection collaboration pre-vention and extinguishing effect was the best.Under this parameter setting,the area of the spontaneous combustion zone in the goaf decreased by 21.6％,and the area of the temperature anomaly zone decreased by as much as 93.4％.The research results have important guiding signifi-cance for the prevention and control of spontaneous combustion in ultra-thick coal seams.
Keywords：ultra-thick coal seamfire prevention and extinguishingnumerical simulationresponse surface method
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 39-45,52 )