103. Effect of alkaline earth metals on nitrogen distribution in the devolatilization process of coal

抄録

Effect of alkaline earth metals (Mg, Ca and Ba) on nitrogen distribution in the devolatilization process of raw and demineralized coals has been examined with a fixed bed quartz reactor. The catalytic effect at 1350℃ decreases in the order of Ca>Ba>Mg. With low rank coals, the Ca increases N_2 and NH_3, but decreases HCN, tar-N and char-N. The catalyst is more effective with N_2 formation, but ineffective when loaded on a bituminous coal. Some factors, such as Ca loading, pyrolysis temperature and the sulfur in coal, have been found to affect the activity of Ca catalyst for N_2 formation of the demineralized lignite; the Ca is more active at temperatures of ≧1000℃ but partly deactivated by the sulfur.