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媒中硫的含量大都由煤层的沉积环境控制，并取决于成煤物质是否曾受过海水影响及其受海水影响的程度。煤中硫的含量对于煤的有效利用甚为重要。这主要是因为燃煤时有相当量的二氧化硫释放到大气中造成对环境有害的酸雨。因此，煤层中硫的分布和地质特征是评估煤的品质及解决有关环境问题的一个重要参数。洁净煤技术是为了有效解决能源需求并减少用煤对环境的影响而发展起来的。它包括煤燃烧前的洁净方法（物理、化学和微生物的煤洁净法）、烟气脱硫、吸附剂喷撒和各种媒燃烧技术（流化床、气化联合循环等）。
Most of the sulfur in the media is controlled by the sedimentary environment of the coal seam and depends on whether the coal-forming material has been affected by seawater and the extent to which it is affected by seawater. The content of sulfur in coal is very important for the effective utilization of coal. This is mainly because there is a considerable amount of sulfur dioxide released into the atmosphere when burning coal to cause harmful acid rain to the environment. Therefore, the distribution and geological characteristics of sulfur in coal seams are an important parameter to evaluate the quality of coal and solve environmental problems. Clean coal technology was developed to effectively address energy needs and reduce the impact of coal on the environment. It includes clean coal pre-combustion methods (physical, chemical and microbiological coal clean-up), flue gas desulfurization, sorbent spray and various combustion technologies (fluidized bed, gasification combined cycle, etc.).