Enhanced trace pollutants removal efficiency and hydrogen production in rice straw gasification using hot gas cleaning system |
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| Affiliation: | 1. Graduate Institute of Environmental Engineering, National Central University, Tao-Yuan, 32001, Taiwan;2. Industrial Technology Research Institute, Green Energy and Environment Research Laboratories, New Energy Technology Division, Hsin-Chu, 31040, Taiwan;1. School of Mechatronic Engineering and Shaanxi Key Laboratory of Non-Traditional Machining, Xi''an Technological University, Shaanxi, China;2. School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot, China;1. Computational Process Engineering Research Unit, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;2. Department of Industrial Chemistry, Faculty of Applied Science, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand;1. Department of Chemical Engineering, Faculty of Engineering & Science, Curtin University, Sarawak Campus, CDT 250, 98009 Miri, Sarawak, Malaysia;2. Department of Mechanical Engineering, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, 93350 Kuching, Sarawak, Malaysia;3. Department of Chemical Engineering, Faculty of Engineering, Computing and Science, Swinburne University of Technology, Jalan Simpang Tiga, 93350 Kuching, Sarawak, Malaysia;1. National-Local Joint Engineering Research Center of Biomass Refining and High-Quality Utilization, Institute of Urban and Rural Mining, Changzhou University, 21 Gehu Middle Rd, Changzhou, Jiangsu 213164, China;2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;3. College of Biological and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, China;1. Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan;2. Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan;3. Department of Tourism Information, Aletheia University, New Taipei 251, Taiwan |
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| Abstract: | This study investigates the enhancement of tar and trace gaseous pollutants (e.g. hydrogen sulfide (H2S) and hydrogen chloride (HCl) removal efficiency derived from rice straw gasification using an integrated hot-gas cleaning system. A bubbling fluidized bed gasifier was used by controlling the temperature at 800 °C and equivalence ratio (ER) ranging 0.2 to 0.4. The hot gas cleaning system was operated at 250 °C and designed to combine three types of absorbents including zeolite, calcined dolomite, and activated carbon. Tar, H2S, and HCl removal efficiency and enhanced hydrogen production were also discussed. The experimental results indicated that light fraction tar removal efficiency was higher than 90% and the overall tar removal efficiency was approximately 70%. In the case of ER 0.4, the syngas tar content was decreased from 71.88 g/Nm3 (without hot gas cleaning system) to 16.53 g/Nm3 (with hot gas cleaning system). The tar removal efficiency is nearly 77% using the hot gas cleaning system. The HCl and H2S removal efficiency ranged from 94% to 98% and from 80.7% to 83.92%, respectively. In the case of ER 0.3 and with the hot gas cleaning system, the HCl and H2S concentrations in cleaned syngas gas were less than 40 ppm and 100 ppm, respectively. Meanwhile, the hydrogen concentration of produced gas was also increased from 6.82% to 9.83% with hot gas cleaning system used. It means that the hot gas cleaning system can effectively remove HCl and H2S from produced gas in gasification, but also it has good potential for improving syngas quality and enhancing gas turbine application in the future. |
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| Keywords: | Gasification Syngas Rice straw Catalyst Hot gas cleaning |
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