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Mg2+和Na+对高熔点煤灰熔融性的影响

高峰 ,  马永静

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引用本文: 高峰, 马永静. Mg2+和Na+对高熔点煤灰熔融性的影响[J]. 燃料化学学报, 2012, 40(10): 1161-1166. shu
Citation:  GAO Feng, MA Yong-jing. Study on the effect of Mg2+ and Na+ on the fusibility of coal ash with high ash fusion point[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1161-1166. shu

Mg2+和Na+对高熔点煤灰熔融性的影响

    通讯作者: 高峰(1965-),男,山西平遥人,副教授,工学博士。Tel:0351-6111121,E-mail:gaofeng@tyut.edu.cn。
  • 基金项目:

    煤转化国家重点实验室开放基金(09-102)。 (09-102)

摘要: 以山西阳泉固庄高熔点煤灰为研究对象,通过向煤灰中添加不同量的MgO与Na2CO3,研究了Mg2+与Na+在高温下对煤灰熔融性的影响。研究结果表明,煤灰熔融温度随氧化镁的添加(5%~25%)单调下降;而随氧化钠添加(5%~25%)出现先降后升现象,在氧化钠添加量为15% 时,灰熔点达到最低。XRD分析表明,阳泉固庄煤灰熔融温度高(大于1 750℃)的原因是高温条件下耐熔矿物莫来石、方英石的存在。添加外加剂后,高温时外加剂与硅酸盐矿物反应,生成了更多的低共熔矿物霞石、堇青石等。同时,Mg2+和Na+的加入会使得非桥氧数量增多,高温煤灰低聚物增多,降低了煤灰的熔融温度。通过三元相图以及SEM分析,高温条件下煤灰中部分元素的富集以及团聚现象是导致Mg2+和Na+对煤灰熔融温度影响不同的原因。

English

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  • 收稿日期:  2011-12-09
  • 网络出版日期:  2012-02-17
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