过渡金属添加剂对煤热解脱硫的影响

本文以小型固定床煤热解实验为基础,研究了Fe、Cr、Mn等三种过渡金属添加剂不同形态对煤热解脱硫的影响。结果表明,不同金属添加剂对煤中硫形态应该有着一定的差异性,Fe3+氧化性较强,其会与黄铁矿发生氧化反应,从而降低硫含量,煤中硫形态受到其他过渡金属添加剂的影响较小;铬系添加剂能够提升煤热解脱硫率,锰系添加剂及铁系添加剂对煤脱硫率有着降低作用。

Thermodynamic Analysis of Desulfurization of Fine Coal by Electrochemical Reduction Flotation

Problems in desulfurization of coal by electrochemical reduction is analyzed and calculated. The result shows that 1 ) the △rGm function of the reaction of pyrite into FeS and the modifying reaction decreasing the oxygenous functions on coal surface is smaller than zero in a spontaneous reaction, and greater than zero in a non-spontaneous reaction; 2) the △rGm value can be adjusted by pH and the dosage of electrolyte to make it be greaterthan zero , which is favorable for the modifying reaction and useful for desulfurization of coal. The research has provided a theoretical foundation for determining reasonable technical parameters of desulfurization。