配煤灰渣中矿物质在高温中转变的定量分析及其对结渣的影响

利用沉降炉系统对榆林和平朔的配煤进行结渣特性实验,测定不同实验温度下煤的结渣指数,并利用X射线衍射分析(XRD)对灰渣中矿物质组成进行了定量分析。结果表明,灰渣中主要存在四种结晶矿物质分别为氧化铁、钙长石、莫来石、氧化硅,以及无定形的玻璃体。其中,灰中氧化铁含量和灰渣中钙长石、莫来石含量对燃煤的结渣倾向性起显著性影响;灰中氧化铁和灰渣中钙长石含量越高、灰渣中的莫来石含量越低,煤燃烧的结渣倾向性越大。通过配煤可以降低煤灰中的氧化铁含量,并降低灰渣中的钙长石生成量和提高灰渣中的莫来石生成量,从而显著降低神木类煤的结渣倾向性。

Quantitative analysis of minerals of blended coal ash at high temperature and its influence on slagging

Experimental study on the slagging characteristics of Yulin & Pingshuo blended coals was carried out in a drop tube furnace.The slagging indexes were determined at different temperatures and the quantitative analysis on the composition of mineral matters in the ash slag was made using X-ray diffraction analysis(XRD).The results indicated that four crystalline minerals-iron oxide,anorthite,mullite,silica,and another amorphous glass are mainly consisted of the ash slag and the first three have a significant effect on the slagging tendency of coals.Higher content of iron oxide in the ash and anorthite in the ash slag,together with lower content of mullite in the ash slag leads to greater slagging tendency.According to this,using coal blending to obtain lower iron oxide content,and to decrease and increase the formation quantity of anorthite and mullite respectively,the slagging tendency of Shenmu type coal could be inhibited at a lower level.