Li Bin, Cao Yan, Zhang Jianmin, Huang Jiejie, Wang Yang, Chen Fuyan
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
Huan Jing Ke Xue. 2003 Mar;24(2):60-5.
The development of various process to the pre-desulfurization of coal was drawn more attention. In present study, the transformation of sulfur forms of three different ranks high sulfur coals during coal pyrolysis and partial gasification were investigated in a fixed bed reactor. The sulfur and carbon content analysis of original coal and coal char produced were determined by LECO SC-444 and wet chemical analysis according to Sugawara's method. The results showed that half of inorganic sulfur and partial of organic sulfur were removed during coal pyrolysis. And the sulfur removal was much more than carbon during pyrolysis process; and the sulfur in the coal char, especially the sulfide sulfur was removed completely during partial gasification process for both Datong coal and Xishan coal, the degree of sulfide sulfur removal could be increased with increasing temperature. At the same time, the results of Yima coal showed that the effect of fixed-sulfur by alkaline metals increased when the temperature was higher than 700 degrees C, which attribute to the increase of the fixed sulfur reaction rate and the decrease of mass-transfer limitation.
煤炭预脱硫各种工艺的发展受到了更多关注。在本研究中，在固定床反应器中研究了三种不同煤阶的高硫煤在煤热解和部分气化过程中硫形态的转变。采用LECO SC - 444和根据菅原方法的湿化学分析法测定了原煤和所产煤焦的硫和碳含量。结果表明，在煤热解过程中，一半的无机硫和部分有机硫被脱除。热解过程中硫的脱除量远大于碳；对于大同煤和西山煤，在部分气化过程中煤焦中的硫，尤其是硫化物硫被完全脱除，硫化物硫的脱除程度可随温度升高而增加。同时，义马煤的结果表明，当温度高于700℃时，碱金属固硫效果增强，这归因于固硫反应速率的增加和传质限制的降低。
