为了研究块煤在熔融气化炉内高温结构演变和降解机制,采用扫描电镜和光学显微镜观察了COREX熔融气化炉风口焦和实验室自制半焦的形貌和显微结构,并结合不同试样的高温反应特性,确定了不同风口焦试样的来源.结果表明,风口焦中兴隆庄块煤形成试样含有较多的中粒和粗粒镶嵌结构,表面呈孔状结构;大同块煤形成试样中类丝炭较多,表面呈层状结构.根据结果提出应考虑灰分对煤焦高温强度的影响,在测量风口焦试样的反应性及反应后强度时应考虑灰分含量进行折算,并确定了以灰分的基准含量为13%进行折算为最佳条件.
In order to study the structure evolution and the degradation mechanism of lump coal at high temperatures, the morphology and structure of the tuyere coke from the COREX melting gasifier and the semi-coke prepared in laboratory were observed by the scanning electron microscopy and optical microscope.By combining those with the high temperature reactivity properties of the samples,the sources of the different tuyere cokes were obtained.The results indicated that a lot of coarses and modest mosaic structures were contained in the tuyere cokes derived from the Xinglongzhuang coal,whose surface was porous structure.While the Datong coal whose surface was layered had more class fusain structure.Based on that,it was proposed that the effects of the ash on the high temperature strength of the tuyere cokes should be considered and when measuring the reactivity and strength of the tuyere cokes after reaction,the measurement results should be converted by taking the ash content into consideration, and the best corrected calculation standard of coal ash was 13% according to the experimental results.
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