Torrefaction of pine in a bench-scale screw conveyor reactor |
| |
| Affiliation: | 1. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan, ROC;2. Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC;3. Center for Bioscience and Biotechnology, National Cheng Kung University, Tainan 701, Taiwan, ROC;4. Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan, ROC;5. Department of Environmental Engineering, National Cheng Kung University, Tainan 701, Taiwan, ROC;1. Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA;2. Biofuels and Renewable Energy Technology Department, Idaho National Laboratory, 750 University Blvd, Idaho Falls, ID, USA;1. College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;2. Key Laboratory of Wood Science and Technology of Zhejiang Province, Zhejiang Agriculture and Forestry University, Hangzhou, Lin’an 311300, China;1. Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan, ROC;2. Iron and Steel Research and Development Department, China Steel Corporation, Kaohsiung 812, Taiwan, ROC;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, PR China;2. Department of New Energy Science and Engineering, University of Science and Technology, Wuhan, Hubei 430074, PR China;3. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK |
| |
| Abstract: | Numerous works are reported in the literature regarding the torrefaction of biomass in batch processes. However, in industrial applications, continuous reactors and processes may by more interesting as this allows for the integration of continuous mass and heat flows. To shed light on the operation of continuous torrefaction processes, this work presents the findings of continuous, bench-scale (2.5 kg h−1) torrefaction experiments using pine wood particles as a feed material in a screw conveyor reactor. The shifts in product mass yields were in line with theoretical expectations for changes in reactor temperature and reactor residence times whereas the degree of filling within the screw reactor and the flow of the nitrogen purge gas were found to be negligible. The process allowed for the measurement of the particle surface temperatures throughout the length of the reactor and significant temperature differences where measured between the wall of the reactor and the reactor screw. The proximate composition and the higher heating value of the torrefied biomass were found to be correlated to the ratio of the mass of dry biomass feed to the mass of the torrefied biomass produced. Important observations regarding the operability of such a process, also relevant to larger-scale processes, include the need to prevent the occurrence of torrefaction vapour condensation (which leaves the torrefaction reactor in the form of a saturated vapour) in the presence of fine, solid particles as this leads to rapid particle agglomeration and process blockage. |
| |
| Keywords: | Biomass Screw conveyor Thermochemical conversion Torrefaction Calorimetry Grindability |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
