褐煤流化床提质性能研究  

Upgrading of lignite by fluidized bed

作　　者：赵振新[1] 王永胜 朱书全[3] 

机构地区：[1]河南城建学院化学与材料工程学院,河南平顶山467044 [2]河南能源化工集团有限公司,河南郑州450004 [3]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《洁净煤技术》2014年第6期23-27,共5页Clean Coal Technology

基　　金：河南省科技攻关资助项目(122102210395);平顶山市重点科技攻关资助项目(2013066)

摘　　要：针对褐煤水分高、发热量低、易风化自燃等特点，以内蒙古褐煤为研究对象，进行了褐煤静态干燥实验和褐煤提质多因素实验。以 O2体积分数10.5％的烟气为干燥介质，在分析褐煤流化床提质干燥机理的基础上，对褐煤进行流化床动态提质实验。结果表明：褐煤提质水分控制在5％左右为宜。褐煤粒级小于3 mm 时，温度对煤样干燥速度影响最大，其次是煤样粒度，风速对干燥速度影响最小。确定全粒级、0.5~1.25、1.25~2、2~3 mm 褐煤临界流化风速分别为38、20、40和50 m3/ h。褐煤适宜提质温度和时间分别为200~240℃和5~8 min。最后建立了褐煤提质模型，说明褐煤提质规律与提质介质温度、风速密切相关，该模型对褐煤提质生产具有指导作用。The lignite has the disadvantages of high moisture,low calorific value and easy spontaneous combustion.The essay took lignite in Inner Mongolia as object,carried out the lignite static drying test and upgrading multi-factor test.Taking the flue gas in which the O2 vol-ume fraction was 10.5% as drying medium,the serial experiments of fluidized bed upgrading based on the analysis of fluidized bed upgra-ding principle were conducted.The results showed that,the optimum moisture was around 5%.When the lignite size was below 3 mm,the temperature affected the drying rate most,followed by lignite size and air speed.The paper determined the critical fluidized air speed for to-tal size fraction,0.5 to 1.25 mm,1.25 to 2 mm,2 to 3 mm was 38,20,40,50 m3 / h respectively.The optimum upgrading temperature and time was 200 to 240 ℃ and 5 to 8 minutes.At last,an upgrading model was built which had a guidance function to lignite upgrading.

关 键 词：褐煤 提质 流化床 临界流化风速 干燥速度 

分 类 号：TD849[矿业工程—煤矿开采] TQ53[矿业工程—矿山开采]