| 论文简介 |
ShaErHu (SEH) coal in Xinjiang province of China, with a reserve of 90 billion tons, is one of the most representative high-chlorine-alkaline coal. The chlorine content in raw coal generally exceeds 1%, which leads to severer corrosion during its combustion in the furnaces. Water washing pretreatment technology is proposed to remove chlorine effectively, and affects the fuel properties. This paper aims to study the effect of water washing pretreatment on the leachate characteristics with inorganic elements and organic matter from SEH coal. Furthermore, the characteristics of coal combustion and ash migration between raw coal and washed coal were compared. Results show that water washing removes approximately 80% of Na and Cl elements as well as some organic matter. The extracted organic matters are primarily aromatic compounds, accounting for more than 75% of the total organic matter. In raw coal, Cl is mostly existed in the inorganic components, accounting for 82.82% of the total, whereas in washed coal, it is mostly present in the organic components, accounting for 70.98% of the total. The alkane structure and -OH group are more prominent in washed coal than in raw coal. The combustion properties of SEH raw coal can be improved by pretreatment with water. When the temperature of the muffle furnace rises above 815 °C, the Na and Cl of SEH raw coal release 99.7% and 92.8 %, respectively, whereas washed coal cannot release nearly all the inorganic elements. |
(创新港)
