酸性条件下煤电化学脱硫实验研究

为了降低煤的脱硫成本,提高脱硫效率,以某矿高硫煤为实验样品,考察煤浆质量浓度、电解质浓度、电解时间、电流密度等因素对煤电化学脱硫效率的影响。通过单因素实验和正交实验,确定了煤在以HCl为电解质条件下电化学脱硫最佳条件。为了优化电化学脱硫工艺,探索使用有机添加剂,以最大限度提高脱硫率。结果表明:电化学脱硫最佳条件为电流密度0.044 A/cm~2,煤浆质量浓度0.02 kg/L,电解时间4 h,电解质浓度0.75 mol/L,在最佳脱硫条件下煤的全硫脱除率达到76.20%,灰分降低20.00%。

Experiment of electrochemical desulfurization of coal under acidic conditions

This paper is meant to achieve the lower cost and the higher rate of desulfurization.The attempt involves using the high sulfur coal from a coal mine as test samples to examine the effect of coal slurry concentration,electrolyte concentration,electrolytic time,current density and other factors on electrochemical desulfurization efficiency and determining the optimum condition of electrochemical desulfurization by single factor experiment and orthogonal experiments under HCl electrolyte conditions.Optimizing the electrochemical desulfurization process leads to the necessity for exploring the use of organic additives for the maximum desulfurization rate.The results suggest that the total sulfur removal rate of up to 76.20％ and the ash content reduction of 20.00％ are possible with the optimal conditions of electrochemical desulfurization consisting of the current density of 0.044 A/cm2,the slurry concentration of 0.02 kg/L,the electrolytic time of 4 h,and the electrolyte concentration of 0.75 mol/L.