采用逐级提取的方法对准东煤进行处理，依次制备了水洗煤、乙酸铵洗煤和盐酸洗煤，在沉降炉中开展了各煤样的颗粒物生成特性实验，以研究准东煤中不同形态无机元素向颗粒物的转化行为。燃烧温度为1 300 ℃时，模拟空气燃烧气氛。使用低压撞击器(LPI)收集燃烧生成的颗粒物，采用扫描电子显微镜和能谱(SEM-EDS)分析颗粒物的成分和形貌。研究表明，准东煤生成的颗粒物主要分布在1~10 μm，并且主要来自煤中乙酸铵溶态和盐酸溶态Ca，Mg的转化。它们大部分形成富Ca，Mg的无规则形貌颗粒，小部分形成球形的硅铝酸盐颗粒。Na在准东煤中主要以水溶态形式存在，很大一部分转化成PM1(尤其是PM0.1)。Fe在准东煤中主要以盐酸不溶态和盐酸溶态形式存在，燃烧后主要分布在PM1~10中，其中盐酸溶态Fe有较大贡献。

Zhundong coal field is the largest coal field in China. However,the content of Na,Ca,Mg and Fe in the coal is usually very high,which has caused severe slagging and fouling problems during Zhundong coal combustion. In order to solve the slagging and fouling problems, the transformation mechanism of inorganic elements during combustion should be well understood. This study aims to investigate the transformation of inorganic elements in different forms in- to ash particles during Zhundong coal combustion. A set of coal samples were prepared by water washing,ammonium acetate washing and diluted hydrochloric acid washing. All the coals were burned in a drop tube furnace at 1 300 ℃ in air condition. The air flow rate was 10 L / min. Coal was fed at the rate of 0. 1 g / min. The combustion generated ash particles were collected by a low pressure impactor ( LPI). The mass of particles was measured by a precision bal- ance. The composition and morphology were analyzed by SEM-EDS. The results showed that Na was mainly in water soluble form. Ca and Mg were mainly in the ammonium acetate soluble and hydrochloric acid soluble form. While Fe was mainly in the hydrochloric acid soluble and insoluble form. After combustion,most of the ash particles were dis- tributed in the range of 1-10 μm. These particles mainly came from the ammonium acetate soluble and hydrochloric acid soluble Ca and Mg in the coal. Most of them were irregular in shape with high content of Ca and Mg. The remai- ning particles were Ca / Mg contained alumino-silicates with spherical shapes. Na mainly contributed to the formation of PM1(especially to PM0. 1 ),and the rest was presented in PM1-10 . Fe was mainly distributed in PM1-10 ,and the contri- bution of acid soluble Fe was significant. From this study,it can be found that inorganic elements in the form of ammo- nium acetate soluble and hydrochloric acid soluble were the key that resulted in the ash deposition of Zhundong coal. The use of acid to remove the inorganics in the coal is a way to mitigate the ash deposition problem.