超临界水条件下煤的脱硫实验研究

EXPERIMENTAL STUDY ON THE DESULFURIZATION OF COAL UNDER SUPERCRITICAL WATER CONDITION

通过超临界水对贵州地区无烟煤及炼焦煤的脱硫实验研究，测定了在水的临界温度附近（350和400℃时）煤的脱硫率。研究表明，温度高（400℃）对煤的脱硫比较有利，而压力增大，脱硫率相对降低，同时需考虑水煤比的相反影响。最佳脱硫享受反应时间的制约，反应时间长，煤质下降显著。煤中有机流的含量可能对脱硫效果产生直接的影响。超临界碱液脱硫实验的初步研究表明，反应1d，无烟煤的脱硫率高于炼焦煤，并且随反应时间增长，炼焦煤的脱硫效果呈下降趋势，对最佳反应时间的不同要求或许是超临界碱液与超临界水脱硫的最大差别。

By using supercritical water, the desulfurization in hard coal and cooking coal fromGuizhou Province have been determined at 35O'C and 4OOC near the critical temperature of water.The results show that the desulfurization is better at 40OC,and its rate decreases with increasingpressure. However,it is necessary to consider the opposit0 effect of increasing water/coal ratio.The optimum desulfurization rate is contr0lled by the duration 0f reacti0n,but the quality of coalbecomes worse apparently with increasing oeaction time. The conoent of ooganic sulfur in coal di-rectly affects the desulfurization.The experimental results in alkaline hydrothermal solution indicate that the desulfurizati0nrate of hard coal is higher than that of cooking coal after one-day-long reaction. And the desulfur-ization rate of cooking coal is decreased with increasing duration of reaction. In optimum reactiontime there is an apparent difference between the methods of supercritical water and alkaline hy-drothermal solution.