摘要
针对准东煤利用过程中颗粒物的生成和Na行为的控制,通过高温沉降炉实验研究准东煤煤粉分别在热解、燃烧和气化时颗粒物的生成特性及Na元素的贡献,并研究3种气氛下添加高岭土对颗粒物生成的影响和Na的捕集特性。结果表明,在煤粉燃烧过程中,热解阶段有一定程度的Na元素挥发;但是焦颗粒燃烧及其后阶段仍然是Na元素挥发的主要阶段。煤粉气化气氛反应有利于Na元素以Na Cl的形式挥发。添加高岭土可有效抑制煤粉热解、燃烧和气化气氛下细颗粒物的生成。高岭土能很好地捕集不同气氛下的反应气相中的Na元素,且气化气氛下高岭土的捕集效果最好。
Aiming at controlling particulate matter formation and Na behavior during the conversion of Zhundong coal, experiments were conducted in a drop-tube furnace to investigate the formation characteristics of particulate matter and the contribution of Na during pulverized Zhundong coal reacting in devolatilization, combustion and gasification conditions. The impacts on the particulate matter formation and the capture of Na by adding kaolin in the three environments were also studied. The results show that a certain amount of Na vaporizes during devolatilization, but char combustion and subsequent ashing are still the most important stages for Na evaporation. Gasification enhances Na evaporating as Na Cl. Adding kaolin can effectively reduce the formation of submicron particles during coal devolatilization, combustion and gasification. While performing well under various conditions, kaolin capturing Na in the gas phase is the most effective during coal gasification.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第16期4396-4401,4525,共6页
Proceedings of the CSEE
基金
国家国际科技合作专项(2015DFA60410)~~
关键词
细颗粒物
准东煤
NA
高岭土
反应气氛
fine particulate matters
Zhundong coal
Na
kaolin
reaction environments
