无烟粉煤制炭化型煤的炭化黏结特性研究  

Study on carbonized binding features of carbonized briquette prepared with anthracite powder

作　　者：郭云飞[1] 张永发[1] 赵钰琼[1] 王琪[1] 

机构地区：[1]太原理工大学煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《煤炭科学技术》2016年第8期208-213,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51274147)

摘　　要：基于自制加压炭化装置和热重(TG)、X射线衍射(XRD)、扫描电镜(SEM)分析等方案,对以煤改性黏结剂、无烟粉煤制备的炭化型煤的结构和黏结特性进行研究。结果表明:型煤在炭化过程中出现2个明显的收缩阶段,第一个收缩阶段(室温~480℃),收缩量为3.2 mm;第二个收缩阶段(650~900℃),收缩量为1.7 mm。黏结剂和煤粒的共同作用引起型煤失重变化、孔结构变化和体积收缩。随着炭化温度的升高,500℃时型煤的孔容和比表面积达到最大,分别为0.871 1 cm^3/g和30.42 m^2/g。炭化型煤的芳香结构整体向有序化方向发展。黏结剂软化形成凝胶覆盖在煤粒表面,500℃以后缩聚、固化于无烟煤粒间。700℃以后固化的黏结剂与粉煤进一步缩聚形成由C—C键连接的叶片状结构,型煤抗压强度提高到14.2 MPa。Based on a self made pressurized carbonized device and thermogravimetry,X- ray diffraction,scanning electron microscope analysis and other plan,a study was conducted on the structure and binding features of the coal modified binder and fine anthracite prepared carbonized briquette. The results showed that there would be two obvious shrinkage stages during the carbonization process of the briquette. At the first shrinkage stage（ indoor temperature to 480 ℃,the shrinkage volume was 3. 2 mm. At the second shrinkage stage（ 650~900 ℃）,the shrinkage volume was 1.7 mm. The joint effect of the binder and coal particles would cause a weight loss variation,pore structure variation and volume shrinkage of the briquette. With the carbonization temperature increased,when the temperature reached at 500 ℃,the pore volume and specific surface area of the briquette would reach the max value and would be 0.871 1 cm3/ g and30.42 m2/ g individually. The aromatic structure of the carbonized briquette would be entirely developed in an ordering direction. The gelation formed with binder softening would cover on the surfaces of the coal particles and would polymerize and consolidate between the anthracite particles after the temperature reached at 500 ℃. After the temperature reached at 700 ℃,the consolidated binder and coal powder would be further polymerized to form leaf structure with C—C key linkage and the compressive strength of the briquette would be increased to 14.2 MPa.

关 键 词：无烟煤 煤改性黏结剂 炭化型煤 黏结特性 

分 类 号：TQ536.1[化学工程—煤化学工程]