Current status of the study of desulfurization of power coal using dry cleaning process

An introduction is made in the paper to 4 different dry cleaning processes for desulfurization of coal by way of living examples,i. e. blended coal desulfurization process,small coal desulfurization process,pre-drying + dry cleaning process and combined primary and secondary dry cleaning process.Practice shows that dry cleaning process is suitable for desulfurization of-100 mm raw coal. The process operates with no need for water and offers the merits of being less in initial capital cost,simple in process flowsheet,and convenient and reliable in operation. If a dry cleaning system is well designed and the equipment of proper specifications are selected for use,its desulfurization performance is comparable to that of wet cleaning method. The dry cleaning process provides an effective technical approach for rational allocation and effective utilization of high-sulfur coal resources and protection of environment.