Xing Mengwen, Kong Jiao, Dong Jie, Jiao Haili, Li Fan
Key Laboratory of Coal Science and Technology, co-founded by Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology , Taiyuan, China .
Environ Eng Sci. 2013 Jun;30(6):273-279. doi: 10.1089/ees.2011.0540.
Thiophenic sulfur compounds are released during coal gasification, carbonization, and combustion. Previous studies indicate that thiophenic sulfur compounds degrade very slowly in the environment, and are more carcinogenic than polycyclic aromatic hydrocarbons and nitrogenous compounds. Therefore, it is very important to study the principle of thiophenic sulfur compounds during coal conversion, in order to control their emission and promote clean coal utilization. To realize this goal and understand the formation mechanism of thiophenic sulfur compounds, this study focused on the release behavior of thiophenic sulfur compounds during coal pyrolysis, which is an important phase for all coal thermal conversion processes. The pyrolyzer (CDS-5250) and gas chromatography-mass spectrometry (Focus GC-DSQII) were used to analyze thiophenic sulfur compounds . Several coals with different coal ranks and sulfur contents were chosen as experimental samples, and thiophenic sulfur compounds of the gas produced during pyrolysis under different temperatures and heating rates were investigated. Levels of benzothiophene and dibenzothiophene were obtained during pyrolysis at temperatures ranging from 200°C to 1300°C, and heating rates ranging from 6°C/ms to 14°C/ms and 6°C/s to 14°C/s. Moreover, the relationship between the total amount of benzothiophene and dibenzothiophene released during coal pyrolysis and the organic sulfur content in coal was also discussed. This study is beneficial for understanding the formation and control of thiophenic sulfur compounds, since it provides a series of significant results that show the impact that operation conditions and organic sulfur content in coal have on the amount and species of thiophenic sulfur compounds produced during coal pyrolysis.
噻吩类硫化合物在煤气化、碳化和燃烧过程中会释放出来。先前的研究表明，噻吩类硫化合物在环境中降解非常缓慢，并且比多环芳烃和含氮化合物更具致癌性。因此，研究煤转化过程中噻吩类硫化合物的生成原理，对于控制其排放和促进洁净煤利用非常重要。为了实现这一目标并了解噻吩类硫化合物的形成机理，本研究聚焦于煤热解过程中噻吩类硫化合物的释放行为，煤热解是所有煤炭热转化过程中的一个重要阶段。使用热解仪（CDS - 5250）和气相色谱 - 质谱联用仪（Focus GC - DSQII）来分析噻吩类硫化合物。选择了几种不同煤阶和硫含量的煤作为实验样品，研究了不同温度和加热速率下热解产生的气体中的噻吩类硫化合物。在200°C至1300°C的温度范围内，以及6°C/ms至14°C/ms和6°C/s至14°C/s的加热速率下进行热解时，获得了苯并噻吩和二苯并噻吩的含量。此外，还讨论了煤热解过程中释放的苯并噻吩和二苯并噻吩总量与煤中有机硫含量之间的关系。本研究有助于理解噻吩类硫化合物的形成与控制，因为它提供了一系列重要结果，展示了操作条件和煤中有机硫含量对煤热解过程中产生的噻吩类硫化合物的数量和种类的影响。
