热解条件对煤焦-CO_2和煤焦-H_2O气化的影响  

Effect of Pyrolysis Conditions on Char-CO_2 and Char-H_2O Gasification

作　　者：陈超[1] 王静[1] 刘伟[1] 罗光前[1] 张森[1] 尹静姝[1] 姚洪[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：《工程热物理学报》2012年第6期1056-1060,共5页Journal of Engineering Thermophysics

基　　金：国家863项目(No.2011AA050106);国家重大科学仪器设备开发专项(No.2011YQ120039)

摘　　要：采用沉降炉快速热解和管式炉慢速热解的方法制得两种煤焦,通过环境扫描电镜(ESEM)和X射线衍射仪(XRD)分别观察煤焦的形貌结构和测量煤焦的晶体化程度。使用热重在不同的CO_2和H_2O浓度的气氛条件下研究在CO_2浓度和H_2O浓度变化时热解条件对煤焦-CO_2和煤焦-H_2O气化的影响。结果显示对于实验用褐煤,快速热解和慢速热解条件生成的煤焦均以密实型结构焦为主。快速热解和慢速热解条件生成的煤焦的煤焦-CO_2和煤焦-H_2O气化过程均可以通过收缩核模型很好地拟合。煤焦-H_2O反应和煤焦-CO_2反应的反应位并不相同。Two kinds of char were produced by fast pyrolysis using a drop tube furnace,and by slow pyrolysis using a fixed-bed furnace.Scanning electron microscopy and X-ray diffractometry were employed to analyze char structure characterization.Char gasification rates were measured by isothermal thermogravimetric reactor in CO_2 or H_2O atmosphere.The results show that both fast-char and slow-char are mainly composed of dense char.The non-reacted core model was applicable to predict carbon conversion of chars produced not only by fast pyrolysis method but also by slow pyrolysis method.The char-CO_2 and char-H_2O reactions did not occur at common active sites.

关 键 词：热解 气化 煤焦结构 

分 类 号：TK123[动力工程及工程热物理—工程热物理]