掺混不同粒径煤灰对准东煤积灰及烧结特性的影响  

Effects of Coal Ash with Different Particle Sizes on Ash Deposition and Sintering Characteristics of Zhundong Coal

作　　者：肖雄 泮浩翔 吕为智 于敦喜[3] Xiao Xiong;Pan Haoxiang;LüWeizhi;Yu Dunxi(Xinjiang Energy Chemical Co.,Ltd.,of State Power Investment Co.,Ltd.,Turpan 838000,Xinjiang Uygur Autonomous Region,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China;State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]中电投新疆能源化工集团吐鲁番有限公司,新疆吐鲁番838000 [2]上海发电设备成套设计研究院有限责任公司,上海200240 [3]华中科技大学能源与动力工程学院煤燃烧国家重点实验室,武汉430074

出　　处：《发电设备》2023年第4期207-211,216,共6页Power Equipment

基　　金：国家电力投资集团有限公司统筹科技项目(202005197H)。

摘　　要：针对采用添加高岭土缓解准东煤燃烧后积灰的方法成本较高的问题,将粒径分级处理后的准东煤煤灰作为添加剂,结合沉降炉积灰实验和固定床烧结实验对不同粒径煤灰的积灰控制效果进行评估。结果表明:不同粒径煤灰的成分组成和矿物分布有所差异,粒径>100μm的煤灰中莫来石等硅铝矿物含量显著高于其他粒径段煤灰。掺混粒径>100μm的煤灰后换热面积灰在外力作用下更容易脱除;掺混粒径<50μm的煤灰不仅无法控制积灰生长,而且会加大积灰的清除难度。掺混粒径>100μm的煤灰后烧结程度减弱是导致换热面积灰清除难度较低的主要原因。The ash deposition from the combustion of Zhundong coal can be alleviated with the addition of kaolin,while the cost of the method is high.Taking the Zhundong coal ash with different particle sizes as the additives,combined with the ash deposition experiment in a drop tube furnace and the sintering experiment in a fixed bed furnace,an evaluation was conducted on the control effect of ash deposition of Zhundong coal ash with different particle sizes.Results show that the composition and the mineral distribution of Zhundong coal ash with different particle sizes are distinct,and the content of silicon-aluminum minerals such as mullite in coal ash of more than 100μm is significantly higher than that in the coal ash of other sizes.The ash depositon on the heat exchange surface is easily to be removed with the the addition of coal ash of more than 100μm,however,the coal ash of less than 50μm not only could not prevent the development of deposition,but also could aggravate the removal difficulty of the deposited ash.The less removal difficulty of the deposited ash on the heat exchange surface is mainly caused by the weaker sintering with the addition of coal ash of more than 100μm.

关 键 词：准东煤 煤灰 添加剂 积灰特性 烧结特性 

分 类 号：TK223.72[动力工程及工程热物理—动力机械及工程]