摘要
研究了铝厂污泥在弱还原气氛下对福建建兴矿煤(JX)、永安矿煤(YA)和创宏矿煤(CH)熔融特性的影响,考察了添加铝厂污泥前后JX煤灰在不同热处理温度下的矿物组成变化.结果表明,JX煤灰熔点低是1000℃以上形成低温共熔物引起的;加入铝厂污泥作为阻熔剂可提高JX煤灰的熔融温度,添加量达6%(ω)时(以煤灰基计),可使JX煤灰软化温度提高到1250℃以上,满足气化炉固态排渣对灰熔点的要求;加入阻熔剂后,在1000℃以上JX煤灰内形成了莫来石,莫来石在灰渣中起骨架作用,并延缓低温共熔物形成,从而提高了灰熔点.
The effect of aluminum plant waste slag on the melting characteristic of Fujian Jianxing coal （JX）, Yongan coal and Chuanghong coal with low ash fusion temperature was studied under the mild reducing atmosphere. The change of mineral compositions under various temperatures before and after addition of the waste slag into JX was examined by XRD and SEM-EDX. The results show that low-temperature eutectic mixtures formed over 1000 ℃ is the major reason for low ash fusion temperature of JX. The coal ash fusion temperature is obviously increased by adding the waste slag .While the added mass of waste slag is 6% （ash as reference）, the ash softening temperature （ST） of JX can be increased to over 1250 ℃ to meet the ash fusion temperature requirements of the gasifier solid deslagging process. Adding the waste slag, mullite phase forms in JX ash above 1000 ℃. The mullite phase plays a skeleton effect on ash, and delays the formation of low-temperature eutectic mixtures, thereby improving the ash melting point.
出处
《过程工程学报》
CAS
CSCD
北大核心
2013年第2期241-245,共5页
The Chinese Journal of Process Engineering
关键词
灰熔融特性
低灰熔点煤
铝厂污泥
低温共熔物
melting characteristic
coal with low ash fusion temperature
aluminum plant waste slag
low-temperature eutectic mixture
