淮南煤焦在不同压力下的CO_2气化反应性  

CO_2 gasification reactivity of Huainan bituminous coal char under different pressures

作　　者：徐朝芬[1] 孙路石[1] 许凯[1] 胡松[1] 向军[1] 帅超[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《煤炭学报》2012年第12期2097-2101,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展规划(973)资助项目(2010CB227003);国家自然科学基金资助项目(21176098;51076052)

摘　　要：选取淮南烟煤在不同升温速率条件下制得的快焦和慢焦,采用高温加压热重分析仪考察其在不同压力下的CO2气化特性并计算气化反应动力学参数。研究表明:快速热解煤焦(HN-RP)的表面较为疏松,相比慢速热解煤焦(HN-SP),孔隙结构显得更为发达;相较于快焦,慢焦平行定向程度更高,芳香层片尺度也更大,即碳微晶结构有序化程度更高,因而煤焦气化反应活性较差;反应压力的增加使活性中间络合物C(O)含量增加,其附着在煤焦的表面使煤焦的气化反应速率增大;总包气化反应动力学表达式可以很好地对煤焦的加压气化反应动力学参数进行计算,在主要的反应区域内,得到的相关系数均大于0.988,且随着反应压力的增大,快焦和慢焦的气化反应级数n都有逐渐减小的趋势。Huainan bituminous was pyrolyzed under different heating rates and the resultant chars were pressurized gasified under high temperature pressurized thermogravimetric analyzer（PTGA）,then the kinetic parameters were also calculated.It is observed that the surface of rapid pyrolysis char（HN-RP） appears more loose and porous than that of the slow pyrolysis char（HN-SP）;the stacking height of crystalline structure and radial spread dimension in char crystallites of the HN-SP are more intense than that of the HN-RP,resulting in a worse reaction reactivity;the concentration of oxygen surface complex C（O） increases with the increasing of pressure,they attach on the char surface and lead an improved char gasification reactivity;the overall gasification reaction formula can calculate the pressurized gasification kinetic parameters and in the dominating reaction range,the obtained correlation coefficients are all higher than 0.988;with the increase of pressure,the order of reaction n is liable to decrease.

关 键 词：淮南煤焦 CO2气化特性 动力学参数 孔隙结构 碳微晶结构 活性中间络合物 

分 类 号：TQ54[化学工程—煤化学工程]