CO2气氛中超细煤粉热解含氮气体释放规律  

Evolution Characteristics of Nitrogen-Containing Gas During Micro-Pulverized Coal Pyrolysis Under CO_2 Atmosphere

作　　者：黄庠永 李小川 姜秀民[2] 陈永平[1,3] 

机构地区：[1]扬州大学水利与能源动力工程学院,扬州225127 [2]上海交通大学机械与动力工程学院,上海200240 [3]东南大学能源与环境学院,南京210096

出　　处：《燃烧科学与技术》2014年第4期356-361,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51306158)

摘　　要：在固定床反应器上进行了CO2气氛中内蒙古褐煤的热解/气化试验,对含氮气体和CO析出特性进行了连续在线测量,考察了温度、粒径和气氛等因素的影响.结果表明,气氛对于气化反应特性和含氮气体的析出特性有较大影响且在高温区更为明显;煤样与CO2的气化反应在550,℃之后显著加快.CO2气氛下煤中氮主要以NH3、HCN和N2O形式析出,而N2气氛下主要是以NH3、HCN和NO形式析出;不同粒径的煤粉热解时HCN和NH3析出曲线相似且差距不大,N2O析出量随粒径增大稍有增加.Pyrolysis experiments of Inner Mongolia brown coal under CO2 atmosphere were carried out in a fixed bed reactor. The evolution characteristics of nitrogen-containing gas and CO were analyzed based on a continuous on-line measurement,and the influence of temperature,particle size and pyrolysis atmosphere was explored. Results show that the pyrolysis atmosphere has a great impact on the evolution process,being more evident at higher temperature.The gasification reaction was significantly enhanced at 550,℃ and became the largest contributor to CO evolution at higher tempreature. Fuel nitrogen released mainly in NH3,HCN and N2O forms under CO2 atmosphere,while in NH3,HCN and NO forms under N2 atmosphere. Particle size exerts little influence on the evolution characteristics of HCN and NH3,but has a noticable effect on N2O evolution.

关 键 词：CO2气氛 热解 含氮气体 气化 

分 类 号：TQ534[化学工程—煤化学工程]