| As China's high-quality shallow coal resources are depleted.However,some coal mines have higher sulfur content in the deeper coal seams.If H2S,which come from the mining,is dispersed into the air,the lives of the miners who are working there will be threatened.Besides,H2S can also cause air pollution through ventilation.So the experiments were carried out in hope of providing some thinking and new ideas for the future work in this field.In this paper,the H2S removal experiment system was designed and built by ourselves,including absorption equipment,selection of absorption liquid,determination of packing tower parameters,and selection of attachments.The experiments were carried out after NaOH solution was selected as the absorption liquid and the packed tower was the main absorption equipment.Then the experimental results were theoretically analyzed based on the double membrane theory.After that,Aspen plus simulation software was used to test the established experimental model.Finally,the conclusion that numerical simulation can reflect the law of H2S removal efficiency can be drawn after the simulation results were compared with the experimental results and the error between the experimental results and the simulation results was considered.The results of this study are as following:First,in the experiment to study the effect of packing tower,the removal efficiency from the highest to the lowest is metal corrugated plate,metal saddle ring,spherical,plastic saddle ring and metal Pall ring.And the removal efficiency of the structured packing is greater than that of the random packing.When in the random packing,the removal efficiency of the metal packing is greater than that of the plastic material.Second,the removal efficiency increases with the increase of the thickness of the filler layer when the thickness of the packing layer in the tower is in the range of 0mm to 400mm.Besides,the removal efficiency of the filler is 10%higher than that of the non-filler.Third,when the ratio of liquid-gas is in the range of 1.3?2.5L/m3,the removal efficiency increases with the increase of the ratio.After the liquid-gas ratio increases to 2.7L/m3,the removal efficiency decreases with the increase of the liquid-gas ratio.And according to the experimental results,the optimal liquid-gas ratio is between 2.5/m3 and 2.8L/m3.Fourth,H2S removal efficiency increases with the increasing of pH value.When the pH value of the absorption liquid is in the range of 7?11,the removal efficiency increases rapidly,and when the pH value exceeds 11,the efficiency slows down.Fifth,the removal efficiency of H2S increases with the increase of the temperature of the absorption liquid.The removal efficiency increases obviously when the temperature of the absorption liquid is between 15? and 35?.What's more,the removal efficiency reaches 95%when the temperature is 35?.However,when it exceeds 35?,the removal efficiency tends to be gentle.Sixth,as the temperature of the mixed gas increases,the removal efficiency increases.The removal efficiency increases greatly when the temperature of the mixed gas is between 15? and 35?.And the temperature exceeds 35?,the growth trend becomes gentle Seventh,the removal efficiency of H2S goes up slowly and remains above 98%when the concentration of H2S in the mixture grows.According to the experiments,parameter optimizes the outcomes:when the thickness of the metal saddle ring is 300mm,the optimal liquid-gas ratio is between 2.5L?2.8L/m3,and the best pH value of the absorption liquid is 10 and the original temperature is 25? as long as the temperature of the mixed gas is control to be close to that of the air inside. |
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