Research and application of hydrogen sulphide prevention and cure technology with stent coal

In order to solve the problem of over-limit of local concentration of hydrogen sulfide gas during the operation of Wudong Coal mining,the measuring points were set up to monitor the diffusion and distribution of disturbance and emission of hydrogen sulfide from support caving.The key influencing factors of hydrogen sulfide treatment was studied by spraying absorption liquid.Accordingly the the processing technology for discharging hydrogen sulfide from the scaffolding by spraying the absorption liquid was carried out.The design and layout of the spray absorption liquid device were also investigated.The process parameters for controlling the hazard of hydrogen sulfide emission from the coal support during coal caving were optimized through the experimental study on the spray absorption liquid.The practical results show that the hydrogen sulfide in the chute and the side-walk drop to 186×10~(-6) and 32.6×10~(-6) respectively after 6 m of downwind flow,and the reduction efficiency of hydrogen sulfide are 86.1% and 84.6% respectively after placing the coal on the support. Eventually,good control effects are achieved.