燃料化学学报2016，Vol.44Issue(3)：314-320,7.
准东煤燃烧碱金属析出气、固相分布特性
Distribution characteristics of alkali emission between gas and solid phase during Zhundong coal combustion
摘要
Abstract
The sequence extraction method was used to analyze the contentof akl ali metals in different modes of occurrence in Zhundong coal.Most sodium in the coal is water-soluble one, accouting for 59%, while potassium exists mainly in the form of non-solublea luminosilicates, accounting for 53%.The combustion experiments of Zhundong coal at the temperature ranging from 400 to 950 ℃ were carried out to study the dits ribution characteristics of alkali emission between the gas and the solid phase.The results show that the ash yield decreases with the increase in temperature.Sodium releases continuously from coal into the gas phase;However, the contentof potassium in the gas phase is lower than that in the solid phase at 400 ℃, while the contentof poat ssium in gas exce ds that ni solid and basically remains the same when the temperature is higher than 500℃. The enrichme ntofa lkali metals in solid ocuc rs adn increases with tem perature.Mro eover, the sodium in the gas phase mainly originates from water-soluble one, and potassium notonly releases from soluble ones, but also from non-soluble aluminosilicates.According to the resultof XRD, alkali metals will react with SiO2 and Al2 O3 to form low-melting-point albite and nepheline.关键词
准东煤/碱金属/析出Key words
Zhundong coal/alkali metlas/e mission分类
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刘炎泉,程乐鸣,季杰强,张维国,王勤辉,周棋,聂立..准东煤燃烧碱金属析出气、固相分布特性[J].燃料化学学报,2016,44(3):314-320,7.基金项目
The project was supported by the National Science＆ Technology Pillar Program （2015BAA04B00）．@@@@国家科技支撑计划（2015BAA04B00）项目资助 （）
