燃料化学学报2018，Vol.46Issue(5)：513-520,8.
二氧化碳和水气氛对高钠煤转化过程中钠迁移的影响
Effect of atmosphere on sodium migration during conversion of high sodium coals
摘要
Abstract
The sodium release and transformation of Yili (YL) and Hutubi (HTB) coal were examined at different temperatures under N2, CO2and H2O atmospheres. By using sequential extraction and wet digestion separately,the occurrence mode and content of sodium in raw coal and chars were measured. The migration of sodium in two coals was studied qualitatively and quantitatively. The results show that water soluble sodium in YL coal accounts for 80.08%,while in HTB,insoluble sodium is 61.54%. The volatilization of sodium in two coals increases with increasing temperature. Water soluble sodium in semi coke shows a decrease trend;ammonium acetate soluble sodium increases and then decreases; hydrochloric acid soluble sodium exhibits an increasing tendency. For YL volatilization of sodium is inhibited by CO2while it is promoted by H2O compared with N2. At 900℃ volatilization of sodium under CO2and H2O is 50.25% and 111.45%,respectively,of that under N2. CO2atmosphere can inhibit volatilization of sodium in HTB. At 900℃ volatilized sodium under CO2 is 80.91% of that under N2. In H2O atmosphere,volatilization of sodium is higher than that in N2before 800℃and slightly lower than that in N2at 900 ℃. The predominant sodium in YL coal is water soluble which volatilized during increasing temperature and transformed to hydrochloric acid soluble and insoluble sodium simultaneously. While for HTB,insoluble sodium is the dominant occurrence mode, followed by water soluble one. CO2and H2O can promote transformation of insoluble sodium to soluble one in HTB coal.关键词
钠金属/迁移/萃取/热解/气化Key words
sodium/migration/extraction/pyrolysis/gasification分类
化学化工引用本文复制引用
骆安琪,朱平,张建树,曲旋,张荣,毕继诚,张金利..二氧化碳和水气氛对高钠煤转化过程中钠迁移的影响[J].燃料化学学报,2018,46(5):513-520,8.基金项目
国家自然科学基金(21566033,U1703253)资助 The project was supported by the National Natural Science Foundation of China(21566033,U1703253). （21566033,U1703253）
