环境气氛作用下煤灰在刚玉质耐火板上的表面结渣行为

Effect of ambient atmosphere on coal ash slagging on the surface of corundum refractory liner

采用了扫描电镜、能谱分析仪、X射线衍射等方法对不同环境气氛下熔融煤灰在刚玉耐火板上煅烧渣样进行了测试,并就渣样的形貌、成分分布及与刚玉质耐火板之间的高温烧结特性进行了分析研究。研究结果表明,氧化性气氛下,碱性氧化物促进了煤灰在刚玉耐火板上的黏结作用,特别是Al含量较高的耐火板更有利于促进其发生共晶反应。还原性条件下,煤灰中生成的FeO具有很强的助熔效果,促使矿物之间产生低熔点的共熔物,同时Fe、Cr、Ti的扩散偏析减弱,加强了熔融煤灰对耐火板的黏结作用。

In order to study the effect of ambient atmosphere on the coal ash slagging on the surface of corundum liner,the slag samples from the high-temperature slagging experiments were analysed by Scanning Electron Microscopy（SEM）,Energy Dispersive Spectrometer（EDS） and X-ray diffraction（XRD）,and the slagging samples＇ properties of morphology and the sintering characteristics between ash compositions and corundum under different atmospheres were studied.The results show that under oxidative atmosphere,the basic substance can promote the cohesive action between coal ash and corundum refractory liner,especially the aluminum rich corundum refractory liner,in which the nucleating and crystaling reactions occur.Under reducing atmosphere,Fe3＋ is transformed into Fe2＋ in the ash to form eutecticum compounds with low melting temperature,which will increase the bonding degree between molten ash slag and corundom refractory liner,and the segregation and slagging-resistant effect of Fe,Cr,Ti is weakened