燃料化学学报2017，Vol.45Issue(10)：1178-1184,7.
SO2和H2O(g)对新疆高钠煤中钠挥发和形态迁移的研究
Effect of H2O(g) and SO2(g) on the volatilization and transformation of sodium during Xinjiang high-sodium coal combustion
摘要
Abstract
Combustion experiment of Xinjiang coal with high sodium content was carried out in a horizontal tube furnace at 400-1100℃.The occurrence of sodium in coal and ash was analyzed by sequential extraction method to study the release and transformation characteristics of sodium,especially the effect of H2O(g) and SO2(g) at 700 ℃ and 1100℃.The results show that,the release ratio of sodium in coal increases gradually with the increase of temperature.The sodium in organic form vaporizes first,followed by water-soluble inorganic sodium,while the inorganic sodium in the form of aluminosilicate is difficult to vaporize due to high thermal stability.At lower temperature (700℃),H2O(g) has a negative effect on the volatilization of sodium,while at higher temperature (1100℃),the reductive atmosphere formed by the reaction of char and H2O(g) promotes the volatilization of sodium.When the proportion of H2O(g) is larger than 20％ in inlet gas,the promotion effect of H2O(g) is weakened.SO2 can inhibit sodium volatilization,while the inhibiting effect of SO2 becomes less significant as the temperature increases from 700℃ to 1100℃.In the presence of both H2O(g) and SO2,the sodium volatilization at 700℃ is inhibited.The combination effect of H2O(g) and SO2 at 1100℃ depends on its concentration.Under the atmosphere containing 20％ H2O and 2.0×10-3 SO2 the total volatilization ratio of sodium increases from 86％ to 87.1％.关键词
新疆高钠煤/SO2/H2O(g)/挥发/形态迁移Key words
Xinjiang high-sodium coal/SO2/H2O(g)/volatilization/speciation transformation分类
化学化工引用本文复制引用
孙鑫,赵斌,王子兵,梁精龙,李慧..SO2和H2O(g)对新疆高钠煤中钠挥发和形态迁移的研究[J].燃料化学学报,2017,45(10):1178-1184,7.基金项目
The project was supported by the National Natural Science Foundation of China (514740013) and Natural Science Foundation of Hebei Province (E2016209163)国家自然科学基金(514740013)和河北省自然科学基金(E2016209163)资助 （514740013）
