不同配比长焰煤对高硫焦煤共热解行为及硫迁移的影响  

Co-pyrolysis behavior and sulfur migration of high sulfur coking coal with adding different proportions of long-flame coal

作　　者：王雪 马磊 张小勇[1] 张代林[1] 曹银平[2] Wang Xue;Ma Lei;Zhang Xiaoyong;Zhang Dailin;Cao Yinping(School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma′anshan Anhui 243032,China;Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243032 [2]宝山钢铁股份有限公司,上海201900

出　　处：《煤化工》2023年第1期63-68,共6页Coal Chemical Industry

摘　　要：为探究在高硫焦煤中添加长焰煤对煤热解过程及硫形态转化的影响,使用大容量热失重装置考察不同配比长焰煤与高硫焦煤配合的共热解实验,研究了高硫焦煤与长焰煤共热解协同效应;并利用非破坏性光电子能谱(XPS)对热解后的焦炭进行表征,结合煤样的铝甄低温干馏实验,进一步探讨不同配比长焰煤对高硫焦煤中硫形态迁移的影响。结果表明:高硫焦煤中的硫以有机硫为主,其中噻吩类硫质量分数为40%、亚砜类硫质量分数为34%,通过铝甄低温干馏后,87.5%的硫分留在了半焦中,2.8%和9.7%的硫分分别转移至焦油和气体中;不同配比长焰煤与高硫焦煤共热解过程中,在575℃~650℃存在明显的负向协同效应,并且随着长焰煤配比的增加,负向协同效应程度增加;当长焰煤配入质量分数为5%时,能够有效提高脱硫率,促进高硫焦煤中硫化物硫和亚砜类硫的逸出。In order to investigate the impact of adding long-flame coal to high sulfur coking coal on the pyrolysis process of coal and the transformation of sulfur forms,large-capacity thermogravimetric device was used to check the co-pyrolysis of high sulfur coking coal with adding different proportions of long-flame coal.The synergistic effects of co-pyrolysis were studied on high sulfur coking coal and long-flame coal.The coke after pyrolysis was characterized through XPS,combined with the low-temperature dry distillation experiments of coal samples by aluminum retort,the migration and transformation patterns of sulfur forms in high sulfur coking coal were further explored when adding different proportions of long-flame coal.The results showed that the high sulfur coking coal mainly contained organic sulfur,including 40%thiophenic sulfur(mass fraction)and 34%sulfoxide sulfur(mass fraction).87.5%sulfur remained in the semi-coke after low temperature dry distillation by aluminum retort,and 2.8%and 9.7%sulfur were respectively transferred to tar and gas.There existed clear negative synergistic effect during the co-pyrolysis of different proportions of long-flame coal and high sulfur coking coal at 575℃-650℃,and the degree of such effect increased with the increased proportion of long-flame coal.When the mass fraction of the blended long-flame coal was 5%,it could effectively improve the desulfurization rate and promote the escape of sulfide and sulfoxide sulfur from the high sulfur coking coal.

关 键 词：高硫焦煤 长焰煤 共热解 协同效应 硫迁移 

分 类 号：TQ520.62[化学工程—煤化学工程]