Numerical analysis of the mechanism of calcium carbonate inhibition of methane-coal dust explosion in pipelines
XU Jingde
LU Sentao
LU Hongyu
LIU Junhai
WANG Zhie
Abstract：To investigate the suppression effect of calcium carbonate powder on the coupled explosion of meth-ane and coal dust in a sealed pipeline and its mechanism of action,a numerical analysis method is used for the study.The analysis results indicate that the best suppression effect is achieved when the concentration of calci-um carbonate is 250g/m3 and the maximum particle size is 58μm,which can effectively reduce the combustion reaction rate of coal dust and the intensity of the explosion.Calcium carbonate inhibits the explosion by adsor-bing on the surface of coal dust to form a protective film,increasing the gaps between coal dust particles,reduc-ing contact area,endothermic decomposition,and producing CO2 and CaO.However,a high concentration and large particle size of calcium carbonate may lead to clumping,making it difficult to form an inert dust cloud,which could instead intensify the increase in local temperature and pressure.Therefore,the reasonable selection of the concentration and particle size of calcium carbonate is crucial for suppressing the explosion of methane-coal dust.
Keywords：explosion suppressionturbulencemethane coal dust explosionnumerical analysiscalcium car-bonate
Publication Date：2024-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 73-78 )