Evaluation of the porous structure development of chars from pyrolysis of rice straw: Effects of pyrolysis temperature and heating rate |
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| Affiliation: | 1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Agricultural and Food Engineering, Shandong University of Technology, Zibo 255049, China;1. Department of Mechanical & Aerospace Engineering, Faculty of Engineering, King Mongkut''s University of Technology North Bangkok (KMUTNB)1518 Pracharat 1 Road, Wongsawang, Bangsue, Bangkok, Thailand 10800;2. The Joint Graduate School of Energy and Environmental (JGSEE) 126 Prachauthit Road, Bangmod, Tungkru, Bangkok, Thailand 10400;1. MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University, Xi''an, China;2. Xi''an Thermal Power Research Institute Co., Ltd, Xi''an, 710054, China;1. Clean Energy Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea;2. Department of Clean Energy and Chemical Engineering, University of Science and Technology, 113 Gwahangno, Yuseong-gu, Daejeon 305-333, Republic of Korea;3. School of Mechanical Engineering, Sungkyunkwan University, 2066, Sebu-Ro, Jangan-Gu, Suwon, Gyeong Gi-Do 440-746, Republic of Korea;4. Sungkyun Advanced Institute of Nano Technology (SAINT), 2066, Seobu-Ro, Jangan-Gu, Suwon, Gyeong Gi-Do 440-746, Republic of Korea;5. Green School, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea;1. Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, Suzhou University of Science and Technology, Suzhou 215009, China;2. School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou 215009, China;3. School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, China;4. Department of Biological Systems Engineering, Washington State University, Richland, WA 99354-1671, USA;5. School of Food Science and Technology, Shihezi University, North Fourth Road, Shihezi 832003, China |
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| Abstract: | The effects of pyrolysis temperature and heating rate on the porous structure characteristics of rice straw chars were investigated. The pyrolysis was done at atmospheric pressure and at temperatures ranging from 600 to 1000 °C under low heating rate (LHR) and high heating rates (HHR) conditions. The chars were characterized by ultimate analysis, field emission scanning electron microscope (FESEM), helium density measurement and N2 physisorption method. The results showed that temperature had obvious influence on the char porous characteristics. The char yield decreased by approximately 16% with increasing temperature from 600 to 1000 °C. The carbon structure shrinkage and pore narrowing occurred above 600 °C. The shrinkage of carbon skeleton increased by more than 22% with temperatures rising from 600 to 1000 °C. At HHR condition, progressive increases in porosity development with increasing pyrolysis temperature occurred, whereas a maximum porosity development appeared at 900 °C. The total surface area (Stotal) and micropore surface area (Smicro) reached maximum values of 30.94 and 21.81 m2/g at 900 °C and decreased slightly at higher temperatures. The influence of heating rate on Stotal and Smicro was less significant than that of pyrolysis temperature. The pore surface fractal dimension and average pore diameter showed a good linear relationship. |
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