内在矿物质对煤焦燃烧特性影响的实验研究

EXPERIMENTAL STUDY ON INFLUENCE OF INCLUDED MINERALS ON THE CHAR COMBUSTION CHARACTERISTICS

以宁夏地区两种烟煤和两种无烟煤为原料,用浮沉方法得到灰分在40%左右的煤粉,然后在马弗炉900℃制焦,再用HCl-HF酸制取脱灰焦.通过比较煤焦脱灰前后热重燃烧曲线的特征参数的变化和转化速率的快慢,分析了内在矿物质对煤焦燃烧特性的影响.结果表明,内在矿物对两种烟煤焦前期的着火有阻碍作用,对后期燃尽有一定促进作用;内在矿物质对两种无烟煤焦的着火有促进作用,对后期燃尽有阻碍作用.

Four different metamorphic degree Ningxia coals were selected for this study. The ash content of coal about 40% obtained with float-sink method and prepared chars in muffle furnace at 900 ℃, then acid-washed by HCI-HF. The effect of included minerals on char combustion characteristics were analyzed by comparing burning curves and their characteristics indexes of the four chars and their demineralized chars. The result indicated that included minerals in the bituminous chars hampered ignition and accelerated burnout, but the included minerals in the anthracite chars accelerated ignition and hampered burnout.