热提质过程中褐煤的碎裂特性  

Fragmentation characteristic of lignite during heat upgrading

作　　者：曲洋[1] 初茉[1] 丁力[2] 张慧慧[1] 王芳[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]北京神雾环境能源科技集团股份有限公司,北京102200

出　　处：《中国矿业大学学报》2014年第3期508-513,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(U1261101);北京市科技支撑计划项目(Z121100004412003)

摘　　要：研究固定床和回转窑工艺的褐煤热碎裂特性．结果表明：固定床工艺中产物碎裂程度随温度及入料粒度增加而增加．当温度为400～700℃、入料粒度为6～13mm时，总碎裂率α为20．439／6～36．94％，粉化率8为5．039／6～9．249，6；入料粒度增为20～25mm，α由25．03％增至80．639／6，8为4．35％～5．609／6．回转窑工艺中回转速率为褐煤碎裂主要因素，当温度为105～230℃、入料粒度为13～20mm、转速为5r／min时，α为66．67％～78．41％，β为10．26％～14．78％，产物碎裂、粉化程度较高；转速由3r／min增为9r／min，α由57．63％增至75．82％，8为11．05％～11．88％．通过对热提质褐煤的孔隙结构、挥发分含量及表面相貌分析，得到了褐煤热碎裂的复合生成因素：孔隙结构变化、水汽行为、挥发分析出及热加工工艺参数．The heat fragmentation characteristics of lignite were studied in a fixed-bed and rota- ry kiln. The results show that the degree of fragmentation in the fixed-bed was increased with the increasing of temperature and feed size. The total fragmentation rate α of 20. 43%- 36.94% and pulverization rate α of 5.03%-9.24%were achieved for 6-13 mm feed at 400- 700 ℃. When the feed size increased from 6-13 mm to 20-25 mm, a is increased from 25.03% to 80.63%andβ is 4.35%-5.60%. The rotary rate is the main parameter for fragmentation in the rotary kiln. The a of 66.67%-78.41%and fi of 10.26%-14.78%for 13-20 mm feed were achieved at 105-230 ℃ and 5 r/min rotary rate. The degree of product fragmentation and pulverization are higher. When rotary rate increased from 3 r/rain to 9 r/min, a increased from 57.63% to 75.82% and fi is 11.05%-11.88%. Through the analysis on pore structure, volatile content and surface appearance of upgraded lignite, the key factors affecting fragmentation are as follows： the change of pore structure, water vapor behavior, volatile ari- sing and heat processing parameters.

关 键 词：褐煤提质 热碎裂 粉化 粒度 

分 类 号：TQ531.9[化学工程—煤化学工程]