高硫煤热解过程活性氢/氧对有机硫变迁行为影响研究述评  

Effects of active hydrogen and oxygen on organic sulfur transformation behavior during pyrolysis of high sulfur coal:A review

作　　者：张文静[1,2] 程亚楠 孔娇 王美君 常丽萍[1,2] 鲍卫仁[1,2] ZHANG Wen-jing;CHENG Ya-nan;KONG Jiao;WANG Mei-jun;CHANG Li-ping;BAO Wei-ren(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Coal Science and Technology,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024 [2]太原理工大学煤科学与技术教育部重点实验室,山西太原030024

出　　处：《燃料化学学报》2022年第6期652-663,共12页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(21808152,21878208,U1910201)资助。

摘　　要：随着优质煤资源的消耗,高硫煤的清洁高效转化备受关注,尤其是高硫炼焦煤中有机硫的调控至关重要。煤热解过程中,有机硫的变迁始于煤大分子结构中C–S键的断裂和含硫自由基的稳定,活性氢/氧是影响其转化赋存形态的重要因素。研究表明,煤在富氢/氧氛围下热解或与生物质、含氧有机物共热解的体系中,含有的活性氢/氧可弱化有机硫的C–S键,促进其断裂并及时结合生成的含硫自由基,促进煤中硫分向气相变迁,减少了含硫自由基与煤基质的二次反应。同时,高挥发分煤与高硫煤共热解过程中,相对丰富的挥发分中的活性氢/氧也会影响高硫煤中有机硫的变迁,降低焦炭中的硫含量,这为煤中硫分定向调控提供了理论基础。With consumption of high quality coal resources, clean and efficient conversion of high sulfur coal has attracted much attention, and especially the regulation of organic sulfur in high sulfur coking coal is very important.During pyrolysis transformation of organic sulfur in coal begins with cleavage of C-S bonds in the macromolecular structure of coal and stabilization of sulfur-containing free radicals, and active hydrogen/oxygen is an important factor affecting the transformation behavior of organic sulfur. It is found that, during coal pyrolysis under hydrogenenriched or oxygen-enriched atmosphere or co-pyrolysis with biomass or oxygen-containing organic matter, the active hydrogen/oxygen in the system can weaken C-S bonds of organic sulfur, and promote their cleavage, timely combination with the generated sulfur-containing free radicals. This can promote sulfur in coal transform to the gas phase and reduce the secondary reaction of sulfur-containing free radicals with coal matrix. At the same time, during co-pyrolysis of high volatile and high sulfur coals, the relatively abundant active hydrogen/oxygen in volatile will also affect the organic sulfur transformation behavior in high sulfur coal, and reduce the sulfur content in coke,which provides a theoretical basis for directional regulation of sulfur in coal.

关 键 词：煤热解 有机硫变迁 C-S键 含硫自由基 活性氢/氧 

分 类 号：TQ643.1[化学工程—精细化工]