上出料系统粉煤密相气力输送特性及其与下出料系统的比较  

Characteristic of top discharge blow tank conveying system and comparison with bottom discharge blow tank conveying system

作　　者：董卫宾[1] 郭晓镭[1] 龚欣[1] 雍晓静[2] 吴跃[2] 罗春桃[2] 

机构地区：[1]华东理工大学煤气化教育部重点实验室,上海200237 [2]神华宁夏煤业集团煤化工公司研发中心,宁夏银川750411

出　　处：《化工学报》2011年第7期1989-1997,共9页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2010CB227002-03);国家科技支撑计划项目(2007BAA08B01)~~

摘　　要：考察了气体进入方式和输送压力对上出料发料罐系统粉煤密相气力输送特性的影响,并比较了上出料和下出料发料罐系统的煤粉输送量、固气比和稳定性差异。结果表明,在上出料发料罐系统中,随锥部气增加,煤粉输送量和固气比呈先增加后减小趋势;随底部气和调节气增加,煤粉输送量和固气比呈减小趋势;随输送压力增加,煤粉输送量和固气比先明显增加后增加趋势减弱。与上出料发料罐系统相比,相同输送差压下,下出料发料罐系统具有较高的输送量和固气比,但二者均具有良好的输送稳定性。The effects of gas entry route and blow tank pressure on characteristic of dense-phase pneumatic conveying of pulverized coal were studied in top discharge blow tank conveying system.Additionally,a comparison was made on solid mass flow rate,solid-gas ratio and conveying stability between top and bottom discharge blow tank conveying system.It was found that in top blow tank conveying system,solid mass flow rate and solid-gas ratio first increased and then decreased with the fluidizing gas in the conical section;decreased with the supplementary gas and fluidizing gas in the bottom section;while for the blow tank pressure increasing,solid mass flow rate and solid-gas ratio first increased obviously and then the increasing degree weakened.In the same total conveying pressure drop,there are higher solid mass flow rate and gas-solid ratio for the bottom than the top discharge blow tank conveying systems,but there was little difference in conveying stability between the two systems.

关 键 词：密相气力输送 粉煤 出料型式 发料罐 

分 类 号：TQ531[化学工程—煤化学工程]