摘要
本文利用褐煤为原料,改质沥青为黏结剂制备褐煤基脱硫炭,研究了改质沥青的添加量、炭化升温速率、活化时间对褐煤基脱硫炭耐磨强度、硫容、孔结构的影响规律.褐煤、改质沥青、脱硫炭采用热重（TG）、液氮吸附法（BET）和扫描电镜（SEM）进行了表征.结果显示,炭化升温速率对脱硫炭性能影响较大,采用分段升温（常温~300℃,升温速率为10℃/min;300~550℃,升温速率为2℃/min;550~700℃,升温速率为5℃/min）炭化时所得脱硫炭的耐磨强度、硫容分别达到98.27%,30.20mg/g,高于相应单一升温速率为5,10℃/min时脱硫炭的耐磨强度和硫容.添加沥青使得褐煤颗粒之间的连接增加,因而随沥青含量的增加,脱硫炭的耐磨强度增加;随沥青含量的增加,脱硫炭4~6nm左右的中孔增加;随活化时间的延长,脱硫炭的中孔增加,但中孔的增加使脱硫炭的硫容降低.
Lignite and modified pitch were integrated to prepare desulfurization char for SO2 removal from flue gas.The main factors influencing the abrasion strength,desulphurization capacity and pore structures of desulfurization chars,such as the amount of modified pitch addition,the carbonization heating rate and activation time were investigated.The lignite,modified pitch and chars were characterized by TG,SEM,and BET technologies in this paper.Results show that the heating rate has great influence on the properties of chars.The strength and desulphurization capacity of the char can reach 98.27% and 30.20mg/g separately when the heating rate is 10 ℃/min from room temperature to 300 ℃,2 ℃/min from 300 to 550 ℃,and 5 ℃/min from 550 to 700 ℃.The abrasion resistance of chars and pores around 4—6nm increases with the amount of modified pitch growing.With increasing activation time,the meso-pores volume of char increases but the desulphurization capacity of char decreases.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2015年第5期906-911,共6页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50204011
20776150)
关键词
褐煤
改质沥青
脱硫炭
烟气脱硫
耐磨强度
lignite
modified pitch
desulphurization char
flue gas desulphurization
abrasion resistance
