The evolution characteristic of sulfur-containing gases during coal thermal conversion |
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| Affiliation: | 1. Hebei Key Laboratory of Heterocyclic Compounds, Handan Key Laboratory of Organic Small Molecule Materials, Handan University, Handan, Hebei, 056005, PR China;2. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, 030001, PR China;1. John and Willie Leone Family Department of Energy and Mineral Engineering and The EMS Energy Institute, The Pennsylvania State University, 110 Holser Building, University Park, PA 16802, United States;2. School of Chemical and Petroleum Engineering, Curtin University of Technology, GPO Box U1987, Perth 6845, Western Australia, Australia;3. University of New South Wales, High Street, Kensington, NSW 2052, Australia;1. Hebei Key Laboratory of Heterocyclic Compounds, Handan University, Handan, Hebei, 056005, PR China;2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, 030001, PR China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China;2. Jiangsu Salt Industry Group, Nanjing, Jiangsu 210000, China;1. Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, Jianghan University, 8 Sanjiaohu Road, Wuhan 430056, Hubei, PR China;2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, PR China;1. State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, China;2. Key Laboratory of Coal Science and Technology, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | In this study, the evolution characteristics of sulfur-containing gases during thermal conversion of two coals under different atmospheres were studied through temperature-program decomposition (TPD) and rapid-heating decomposition (RHD) coupled with online mass spectrum (MS). The releasing profiles of H2, CH4 and CO were also measured. Results showed that the effect of atmosphere and heating rate on evolution of sulfur-containing gases was very significant. It was found that Ar atmosphere was more favorable to the formation of sulfur-containing gases than CO2 atmosphere by using TPD-MS. In CO2, the formation of H2S and SO2 was restrained in 260–650 °C, but was promoted in 880–980 °C; the formation of COS was promoted during the whole process. In Ar, high releasing intensity of H2 and CH4 could stabilize sulfur-containing radicals which led to high amount of H2S and SO2; while high releasing intensity of CO in CO2 resulted in high amount of COS. By using RHD-MS, it was found that the steam atmosphere was highly favorable for the transformation of H2S, SO2 and COS during the entire reaction period. However, the CO2 atmosphere was disadvantageous to the transformation of H2S, SO2 and COS at the initial stage, but slight favorable for the transformation of H2S, SO2 and COS during the later stage. These was resulted from the gasification reaction of steam/CO2 with coal. The key factor was the releasing amount of H2 and CO, which promoted the formation and transformation of H2S, SO2 and COS. |
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| Keywords: | Sulfur transformation Sulfur-containing gas Coal Thermal conversion Organic sulfur |
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