O_2/CO_2气氛中超细煤粉着火特性  

Investigation on Ignition Characteristics of Micro-pulverized Coal in O_2/CO_2 Mixture

作　　者：黄庠永[1] 刘加勋[1] 姜秀民[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海市闵行区200240

出　　处：《中国电机工程学报》2010年第11期50-55,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50876060)~~

摘　　要：利用热显微镜和摄像系统,研究了气氛、煤粉粒径、氧气流量和氧气浓度对超细煤粉在O2/CO2气氛中的着火特性的影响。试验表明煤粉在N2/O2中比在CO2/O2更容易着火,颗粒粒径在20μm及以下的煤粉着火温度及过程差别不大,挥发分析出比较平稳,而颗粒粒径较大的煤粉着火温度稍高。在纯氧中,氧气流量在大于一定值(200mL/min)后对着火影响不大。O2/CO2气氛中氧气浓度对煤粉着火影响较大,随着氧气浓度的降低,煤粉着火方式从均相着火变成非均相着火;且氧气浓度越低,着火越困难。The effects of atmosphere, particle size of coal, oxygen flow rate and oxygen concentration on the ignition characteristics of micro-pulverized coal were studied using a hot stage microscope attaching a camera. The results indicated that it is easier for coal to ignite in N2/O2 mixture than in CO2/O2 mixture. The coals particle size about or below 20 μm has little difference on ignition temperature and the releasing gently of volatile matter make the ignition process mild.However, for the coals particle size above 20 μm, the process become more violent for the volatile matter evolves intensively. The flow rate of pure oxygen stream has no significant influence on ignition of coal when it was set to a certain value （200 mL/min in the experiment）.The oxygen concentration has a noticeable effect on the ignition. As the oxygen concentration decreases, the ignition mechanism change from homogenous mode to other modes and the ignition become more difficult.

关 键 词：超细煤粉 O2/CO2 着火特性 热显微镜 

分 类 号：TQ534[化学工程—煤化学工程]