Rantuch Peter, Martinka Jozef, Ház Aleš
Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia.
Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, 812 37 Bratislava, Slovakia.
Polymers (Basel). 2021 May 27;13(11):1748. doi: 10.3390/polym13111748.
This study focuses on the energy potential and combustion process of torrefied wood. Samples were prepared through the torrefaction of five types of wood: Ash, beech, oak, pine and spruce. These were heated for 2 h at a temperature of 300 °C under a nitrogen atmosphere. Torrefied wood was prepared from wood samples with dimensions of 100 × 100 × 20 mm. These dimensions have enabled investigation of torrefied wood combustion in compact form. The effect of the external heat flux on the combustion of the samples was measured using a cone calorimeter. The observed parameters, include initiation times, heat release rate and combustion efficiency. The results show that increasing the external heat flux decreases the evenness of combustion of torrefied wood. At the same time, it increases the combustion efficiency, which reached an average value of approximately 72% at 20 kW m, 81% at 30 kW m and 90% at 40 kW m. The calculated values of critical heat flux of the individual samples ranged from 4.67 kW m to 15.2 kW m, the thermal response parameter ranged from 134 kW s m to 297 kW s m and calculated ignition temperature ranged from 277 °C to 452 °C. Obtained results are useful both for energy production field and for fire safety risk assessment of stored torrefied wood.
本研究聚焦于烘焙木材的能量潜力和燃烧过程。通过对五种木材（白蜡木、山毛榉、橡木、松木和云杉）进行烘焙来制备样品。这些木材在氮气气氛下于300℃加热2小时。烘焙木材由尺寸为100×100×20毫米的木材样品制备而成。这些尺寸使得能够以紧凑形式研究烘焙木材的燃烧。使用锥形量热仪测量外部热通量对样品燃烧的影响。观察到的参数包括着火时间、热释放速率和燃烧效率。结果表明，增加外部热通量会降低烘焙木材燃烧的均匀性。同时，它会提高燃烧效率，在20千瓦/平方米时燃烧效率平均值约为72%，在30千瓦/平方米时为81%，在40千瓦/平方米时为90%。各个样品的临界热通量计算值在4.67千瓦/平方米至15.2千瓦/平方米之间，热响应参数在134千瓦·秒/平方米至297千瓦·秒/平方米之间，计算出的着火温度在277℃至452℃之间。所得结果对能源生产领域以及储存的烘焙木材的消防安全风险评估均有用处。
