A mathematical description of thermal decomposition and spontaneous ignition of wood slab under a truncated-cone heater

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• 作者：Qian Liu (1181)
  Dekui Shen (1181)
  Rui Xiao (1181)
  Huiyan Zhang (1181)
  Mengxiang Fang (2181)
  
• 关键词：Thermal Decomposition ; Spontaneous Ignition ; Model ; Temperature ; Ignition Time
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2013
• 出版时间：March 2013
• 年：2013
• 卷：30
• 期：3
• 页码：613-619
• 全文大小：533KB
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• 作者单位：Qian Liu (1181)
  Dekui Shen (1181)
  Rui Xiao (1181)
  Huiyan Zhang (1181)
  Mengxiang Fang (2181)
  
  1181. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China
  2181. The State Key Laboratory for Clean Energy, Zhejiang University, Hangzhou, 310027, China
  
• ISSN：1975-7220

文摘

A mathematical model of thermal decomposition together with the flammability limit is proposed to describe the pyrolysis and spontaneous ignition of wood slab subjected to the radiation from a truncated-cone heater. The prominent physical and chemical phenomena were considered in the model, involving heat transfer in a solid, heat consumed by thermal decomposition reactions, the evaporation of moisture, re-radiation from pore surfaces inside a solid and so on. The numerical solution allows the prediction of in-depth temperature profiles, evolution of volatiles, variation of thermal conductivity, apparent mass loss (solid conversion) and ignition time. The different densities for wood species and effect of moisture content and grain orientation on thermal conductivity are also considered in the model, producing a good prediction of surface temperatures. This gives birth to the reasonable prediction on ignition time of wood by employing fixed surface temperature (400 掳C) as ignition criterion. However, the analysis of constituent fractions for the species associated with the multi-components kinetic scheme should be included in the mathematical model to give a more precise prediction on the apparent mass loss of solid.