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Experimental and numerical analysis of poplar thermodegradation

Abstract : Wood heat treatment (WHT) is an eco-friendly preservation process to improve material properties, such as dimensional stability and durability. This value-added technique had a huge development in the last decades and, concerning heating rate and treatment duration, presents similar operating conditions to slow pyrolysis. The treatment is conducted within an inert atmosphere (nitrogen or vacuum) with a temperature ranging between 180 °C and 240 °C and is characterized by a low heating rate in the order of 0.25 to 1 °C min-1. Due to heat effect, wood polymers undergo a thermodegradation characterized by a mass loss. This parameter characterizes treatment progress and is used as a quality control indicator. The present study aims to analyze the effect of treatment intensity (operating temperature for a given process duration) on thermodegradation of a hardwood species (Poplar, Populus nigra). Experiments were performed within a conduction oven under nitrogen on large scale boards (25 x 11 x 2.5 cm). Five temperatures were studied in a stablished range between 200-240 °C with a slow heating rate of 1 °C min-1 and 10 h of treatment duration. A maximum mass loss of 21.02 wt% was observed at the higher temperature (240 °C). The lower mass loss value 6.19 wt% was recorded for the experiment performed at 200 °C. Based on measured data, a numerical model for instantaneous mass loss prediction during thermal process has been developed. A two-step kinetic mechanism was adopted to simulate reaction rate of wood components degradation. The reaction rates from numerical results agree with observations reported in literature showing a more pronounced thermodegradation when treatment temperature increases. A comparison between experimental and numerical results allows the model’s accuracy evaluation.
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https://hal.univ-lorraine.fr/hal-02386073
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Submitted on : Friday, November 29, 2019 - 10:41:54 AM
Last modification on : Wednesday, January 12, 2022 - 3:41:06 AM

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  • HAL Id : hal-02386073, version 1

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Bo Jhih Lin, Silveira Edgar, Baptiste Colin, Mounir Chaouch, Anélie Petrissans, et al.. Experimental and numerical analysis of poplar thermodegradation. 6th INTERNATIONAL CONFERENCE OF HARDWOOD PROCESSING (ISCHP 2017) DURING SEPTEMBER 25 TO 28, 2017 - City of Lahti - FINLAND, Sep 2017, Lahti, Finland. ⟨hal-02386073⟩

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