淮南煤焦CO_2气化反应特性的试验研究  

CO_2 Gasification Reaction Characteristics of Huainan Coal Chars

作　　者：徐朝芬[1] 孙路石[1] 向军[1] 卢腾飞[1] 谢天[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,武汉430074

出　　处：《动力工程》2009年第8期794-800,共7页Power Engineering

基　　金：新世纪优秀人才支持计划资助项目(NCET-07-0335);国家自然科学基金资助项目(50806025;50776037)

摘　　要：在反应温度950～1300℃条件下，采用热重一红外方法研究了6种不同热解速率和热解终温的淮南煤焦的CO2气化反应特性，对CO2气化产物的红外谱图进行了比较，并考察了制焦温度和快、慢速热解焦对煤焦的石墨化程度和矿物质的影响．结果表明：随着升温速率的加快，煤焦反应性增强；制焦温度越高、升温速率越快，越不利于气化产物CH4的生成，但CO的释放浓度随制焦温度的升高和升温速率的加快而升高；随着制焦温度的升高，煤焦的n（C）／n（H）呈单调上升；快速热解煤焦表面的孔隙度大于慢速热解煤焦，增强了煤焦的气化反应活性；随着热解温度的升高，慢速热解焦比快速热解焦的有序化程度快；当热解温度为950℃时，快、慢速热解焦中矿物质均未发生熔融现象，当热解温度达到1200℃以后，随着热解温度的升高，慢速热解煤焦中的矿物质发生熔融并团聚成更大的球型颗粒，快速热解焦中的矿物质熔融成小球，但没有团聚成更大的球型颗粒．CO2 gasification reaction characteristics of Huainan coal chars were studied by thermogravimetry （TG） and infrared （IR） method at six different pyrolysis rates and final temperatures within the reaction temperature of 950 - 1 300℃. The infrared spectrums of the products from COe gasification were compared. The effect of char-making temperature and pyrolysis rate on the degree of graphitization and mineral matter were investigated. Results show that the reactivity of the chars increases with increasing the heating rate. High char-making temperature and high heating rate are unfavorable to the production of CH4. While the releasing concentration of CO increases with increasing the char-making temperature and heating rate. With the increase of char-making temperature, the ratio of n（C）/n（H） increases. The porosity of char produced at rapid heating rate （RHC） is bigger than that of char produced at slow heating rate （SHC）, namely the gasification reactivity of RHC is enhanced. And with the increase of pyrolysis temperature, the degree of graphitization of SHC is higher than that of RHC. The mineral matter in SHC and RHC will not fuse when the pyrolysis temperature is 950 ℃. When the pyrolysis temperature is higher than 1 200℃, With the increase of pyrolysis temperature, the mineral matters in SHC will fuse and agglomerate into bigger spherical granules, while the mineral matters in SHC will fuse into small balls instead of agglomerating into bigger spherical granules.

关 键 词：煤焦 升温速率 热解温度 CO2 气化反应特性 热重-红外法 

分 类 号：TK121[动力工程及工程热物理—工程热物理]