Investigation into the synergistic treatment of H2S in coal seams and coal desulfurization
To investigate the synergistic treatment of H2S and sulfide in coal seams,coal samples from Shaping coal mine were selected for experimentation.A self-designed experimental apparatus was employed to conduct H2S absorption and coal desulfurization experiments using mixed alkali solutions with varying compositions and concentrations.The coal samples were subjected to speciation sulfur testing and X-ray photoelectron spectroscopy before and after the experiment.The absorbents used in the experiment were characterized using ion chromatography.The study delved into the reaction mechanism involved in H2S absorption and coal desulfurization by mixed alkali solutions.Response surface methodology was employed to analyze the influence of various reaction factors on the efficiency of H2S absorption and coal desulfurization.The findings revealed that individual alkali solutions exhibited effective H2S absorption in coal seams,albeit with a weak coal desulfurization effect.However,the addition of NaClO to alkali solutions notably enhanced both H2S absorption and coal desulfurization efficacy,while mitigating the secondary dispersion of H2 S.Among several commonly used alkali solutions,NaOH supplemented with NaClO exhibited optimal H2S absorption and coal desulfurization effects.Under alkaline conditions,NaClO oxidized H2S and sulfide in coal.Following the reaction,reductions were observed in H2S and low-valence sulfur compounds in coal,such as mercaptan,thioether,and thiophene,while there was an increase in SO2-in absorbents and high-valence sulfur in coal,such as sulphone(sulfoxide).Among the factors including NaOH concentration,NaClO concentration,and reaction temperature,it was found that NaOH concentration exerted the most significant influence on H2S absorption efficiency,whereas NaClO concentration had the greatest impact on coal desulfurization efficiency.The interaction between NaOH concentration and NaClO concentration exerted a more pronounced effect on both coal desulfurization efficiency and H2 S absorption efficiency.The optimal treatment parameters,determined using Design-Expert software,were a NaOH mass concentration of 54 g/L,NaClO mass concentration of 54 g/L,and a reaction temperature of 21.4 ℃.The predicted H2S absorption efficiency and coal desulfurization efficiency were found to align well with the experimental results.
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