煤催化气化条件下不同煤种煤灰烧结行为研究  

Sintering behavior of different coal ashes in catalytic coal gasification process

作　　者：毛燕东[1,2] 金亚丹 李克忠 毕继诚 李金来 辛峰[1] 

机构地区：[1]天津大学化工学院,天津300072 [2]新奥科技发展有限公司,煤基低碳能源国家重点实验室,河北廊坊065001

出　　处：《燃料化学学报》2015年第4期402-409,共8页Journal of Fuel Chemistry and Technology

基　　金：国家科技支撑计划(2009BAA25B00);国家重点基础研究发展规划(973计划,2011CB201305)

摘　　要：选取9类典型煤种,利用压差法测定烧结温度的实验装置,结合灰渣的XRD分析结果,考察了添加K基碱金属催化剂、不同煤种灰成分对烧结温度的影响。结果表明,碳酸钾催化剂的添加,明显降低高铁钙含量的WJT煤的灰熔点及烧结温度,碱金属K化合物极易同煤中Fe、Ca的矿物质反应生成低温共融物进而加剧煤灰的熔融结渣。不同煤种烧结温度的差异与煤灰中硅、铝、铁、钙含量密切相关。铝、硅含量高的煤灰烧结温度较高,而铁、钙含量高的煤灰烧结温度相对较低。碱金属K催化剂的添加加剧了煤灰的烧结结渣,而钙、铁的存在会加速硅铝酸盐间的反应生成低温共融物进而加速灰熔融。各煤种烧结温度的变化与其灰成分在Ca O-Si O2-Al2O3、Fe O-Si O2-Al2O3三元相图上的位置相吻合。A homemade pressurized pressure-drop measuring device and X-ray diffractometer （XRD） analyzer were used to determine the effects of alkali catalyst addition and different chemical compositions of nine kinds of coal ashes on the ash sintering temperature.The resultss how that the sintering temperature of WJT coal ash containing higher Fe and Ca compositions decl ines markedly after adding potassium carbonate catalyst.K minerals react easily with Fe and Ca minerals to produce low-me lting-point eutectics , which accelerates the sintering and agglomeration.The sintering temp eratures of var ious coal as hes ar e clos ely relat ed to the contents of Si, Al, Fe and Ca in coal ashe s.The sintering temperature sin crease for the coal ashw ith higher conte nt of silicon and aluminum, but decrease for the coal ash wi th higher content of calciuma nd iron in as h.Adding K catalyst can promote the slagging by forming eutectic matters, especially in the presence of calcium and iron. The thre -elemen t phase diagrams of CaO-SiO2-Al2 O3 , FeO-SiO2-Al2 O3 could explain the sinterin g tempera tures v ariance.

关 键 词：煤催化气化 烧结温度 压差法测定技术 煤灰成分 相图 

分 类 号：TQ53[化学工程—煤化学工程]