内在矿物质对煤焦燃烧特性影响的动力学研究（Ⅰ）等温热重研究

选择宁夏地区2种烟煤和2种无烟煤作为实验煤样，用浮沉法得到灰分在30％左右的煤粉在马弗炉上900℃制焦，然后用化学脱灰法处理煤焦样，得到超低灰煤焦样。在WCT-2型热重分析仪上，在消除内、外扩散影响的条件下对高灰煤焦和脱灰煤焦进行等温热重实验。动力学分析的结果表明：2种烟煤焦脱灰后的活化能降低，2种无烟煤焦脱灰后的活化能升高；烟煤中的矿物质对烟煤的燃烧有阻碍作用，无烟煤中的矿物质对烟煤的燃烧有促进作用。

Experimental research on influence of included minerals on the combustion kinetics of coal charas

Four different metamorphic degree NingXia coals were selected for this study. The ash content of coal about 30% were obtained with float-sink method and prepared ＇chars in muffle furnace at 900℃, then acid-washed by HCL--HF. The effect of included minerals on char combustion kinetics were investigated by isothermal thermogravimetry under conditions of eliminating the effect of diffusion of internal and external. The change of activation energy of chars and their demineralized chars were calculated. The results showed that the activation energy of bituminous chars higher than its dimineralized chars and the activation energy of anthracite chars lower than its dimineralized chars. It also indicated that included minerals in the bituminous chars hampered combustion and the included minerals in the anthracite chars accelerated combustion.