Numerical simulation of lye injection into coal seams for governance of H2S and its field applications
LIANG Bing
YUAN Xinpeng
SUN Weiji
ZHANG Xiuping
Abstract：Lye injection into coal seams can effectively reduce the emission of H2S.To investigate the reaction law between lye and H2S in the coal seam,COMSOL Multiphysics chemical reaction module was applied to simulate the process of alkaline solution (NaHCO3) injection into the 9th coal seam in Tiexin mine.It was assumed tlat lye flow in coal fracture was in line with N-S equation,flows in porous was in compliance with Brinkman equation,and the reaction mass changes satisfy convection-diffusion equation.The flow rule of lye in coal seam and the effect of H2S treatment were studied based on H2S occurrence conditions and lye injection parameters in coal seams.The results show that the content of H2 S can be effectively reduced in the lye flowing seam area.Lye-affected zone gradually expands with injection time.After continuous injection for 18 hours,the H2S volume fraction decreases more than 51.3％ in the areas 7-9 m away from hole,and the gas 7 m around the hole is almost completely neutralized.The simulation result suggests that the appropriate injection hole space is in the range of 8-10 m.Lye injection experiment with hole space of 8 m was carried out on W910 working face.The highest volume fraction of H2S is 5.6 × 10-6 after injection,which does not exceed the limit value,suggesting that the simulation result can guide the coal seam lye injection.
Keywords：H2Sneutralization reactionlye injection into coal seamslye injection simulationfield experiment
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 244-249 )