燃料化学学报（中英文）2023，Vol.51Issue(9)：1232-1239,8.DOI:10.1016/S1872-5813(23)60348-2
准东煤CFB气化过程中运行条件对碱金属钠挥发和转化的影响
Effect of operating conditions on release and transformation of sodium during CFB gasification of Zhundong coal
摘要
Abstract
To provide some useful suggestions to the operation of circulating fluidized bed(CFB)gasifier,the effect of gasification temperature,residence time and agent on the release and transformation of sodium was studied by using a fixed bed reactor combined with Factsage software.The results indicated that gasification temperature was the significant factor to the release and transformation of sodium.For the promoting effect of sodium release,it was ascribed to the intense of sodium volatilization and competitive reaction between lime and meta-kaolin.Meanwhile,the high temperature promoted the formation of nepheline and slag.The threshold temperature of latter was near 950℃.It was interesting to find that the release of sodium could be divided into two stages:coal pyrolysis and char gasification.In coal pyrolysis,part of organic and water-soluble sodium was released.The remainder either combined with char structure,or reacted with minerals.In char gasification,Sodium,combined with char structure,was released along with char gasification.Due to the decrease of melting temperature and the formation of NaOH,steam showed a promoting effect on the sodium release.Oppositely,oxygen and nitrogen presented an inhibiting effect.The former was ascribed to the formation of Na2SO4,while the latter was caused by the chemical binding and physical wrapping effect of char.关键词
准东煤/气化/钠/挥发与转化Key words
Zhundong coal/gasification/sodium/release and transformation分类
化学工程引用本文复制引用
杨子健,郭帅,王小芳..准东煤CFB气化过程中运行条件对碱金属钠挥发和转化的影响[J].燃料化学学报（中英文）,2023,51(9):1232-1239,8.基金项目
The project was supported by the National Natural Science Foundation of China(22008236). （22008236）
