Effect of sample layer thickness and temperature rise time on the pyrolysis temperature of cellulose |
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| Institution: | 1. School of Automobile, Chang’an University, Xi’an 710064, China;2. Institute of Engineering Thermophysics, School of Power and Energy, Northwestern Polytechnical University, Xi’an 710064, China;3. Institute of Thermal Engineering, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;2. School of Mechanical Engineering, VIT University, Vellore, Tamilnadu 632014, India;1. State Key Laboratory of Green Building in Western China, Xi’an, Shaanxi 710055, PR China;2. School of Architecture, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, PR China;3. Yuzhong Solar Heating and Cooling Demonstration Base, Gansu Institute of Natural Energy, Lanzhou, Gansu 730000, PR China;4. Building Environment and Energy Conservation Design Research Center, China Southwest Architectural Design and Research Institute Corp., Ltd., Chengdu, Sichuan 610000, PR China |
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| Abstract: | The temperature profiles throughout a rapidly heated sample layer were calculated as functions of time and sample thickness using the one-dimensional heat equation. The rates of decomposition throughout the layer were then calculated using the Arrhenius equation. The decomposition temperature, T1/e, for a layer is defined as the temperature at which a fraction of 37% of the material is not yet decomposed. The theoretical results are used to predict T1/e in cellulose for different Curie-point temperatures and heating rates. In general, T1/e increases with increasing heating rates. In vacuum Curie-point pyrolysis (e.g., pyrolysis-mass spectrometry) of thin samples (thickness < 0.04 mm), T1/e is almost uniform throughout the sample. When loss of heat occurs due to an ambient gas (e.g., pyrolysis-gas chromatography) the temperature rise time increases so the decomposition proceeds at a lower temperature; this is most pronounced at the outside of a very thick layer. |
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