摘要
以冷水江页岩煤灰为基灰,向其添加不同质量的Fe2O3粉末,制成Fe2O3含量分别为1.53%、10%、20%、30%和40%煤灰试样若干。首先采用角锥法测量Fe2O3含量变化对煤灰熔融特性的影响,然后将不同Fe2O3含量煤灰均匀疏松的敷设在碳化硅、高铝刚玉、中铝刚玉3种卫燃带耐火材料板表面,并将其置入高温马弗炉内于1 330℃下煅烧40 h,待煅烧完成后,观察3种卫燃带耐火材料板表面的结渣特性,并对灰渣进行X射线衍射分析。试验结果表明:随煤灰中Fe2O3含量的增加,煤灰熔融温度均呈下降趋势,同时在卫燃带耐火材料板表面结渣程度均趋于严重,但当煤灰中Fe2O3含量增至一定值后,其熔融温度反而呈上升趋势,且在卫燃带耐火材料板表面结渣程度将不再继续增强,反而有所降低。
With Lengshuijiang River-originated shale coal ash serving as the base ash,Fe2O3 powder in various weights was added to prepare several coal ash samples with the Fe 2 O 3 powder content being 1. 53%,10%,20%,30% and 40% respectively. Firstly,the pyramid method was adopted to measure the influence of the changes of the Fe 2 O 3 powder content on the melting characteristics of coal ash. Afterwards,the coal ash with different Fe2O3 powder contents was laid uniformly and loosely on the surface of the refractory belt plates made from silicon carbide,high alumina corundum and medium aluminum corundum respectively and placed into a high temperature muffle furnace to calcine for 40 hours at 1 330 ℃. Upon the completion of the calcination,the slagging characteristics of the three kinds of the refractory belt plates were observed and an X-ray diffraction analysis was performed of the coal ash. The test results show that with an increase of the Fe2O3 powder content of the coal ash,all the melting temperatures of the coal ash assume a descending tendency and at the same time,the slagging extents on the surface of the plates tend to be worsened. However,when the Fe2O3 powder content of the coal ash increases to a given value,their melting temperatures assume an ascending tendency instead and the slagging extents on the surface of the plates will no longer get increased but somewhat decreased.
出处
《热能动力工程》
CAS
CSCD
北大核心
2013年第5期518-522,555-556,共5页
Journal of Engineering for Thermal Energy and Power
关键词
煤灰
卫燃带
熔融特性
结渣
Fe2O3粉末
coal ash,refractory belt,melting characteristics,slagging,Fe2O3 Powder
