Abstract

The low-temperature pyrolysis of wood briquets is investigated. A double-walled reactor permits indirect heat supply. In modeling the continuous production of semicoke from wood briquets, the process is divided into stages: preliminary heating (at 220°C, which corresponds to briquet production); low-temperature pyrolysis (temperature 350–550°C); and cooling of the semicoke in an inert medium (gaseous nitrogen). The process is exothermal. The release of H₂, CH₂, and CO (with maximum concentrations of 7.0, 47.6, and 31.2 vol %, respectively) is observed. These compounds are present in the hot gaseous products formed after condensation of the vapor–gas mixture. The characteristics of the semicoke produced are determined. The variability in its reactivity and morphological structure is investigated. With increase in carbonization of the semicoke samples, nonlinear increase in the calorific value is observed (from 30.04 to 33.02 MJ/kg). In addition, the morphology of the particles changes, on account of the formation of open pores and channels.

中文翻译：

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多步低温热解法从木材废料生产压块半焦

摘要

研究了木砖的低温热解。双壁反应器允许间接供热。在模拟从木团块连续生产半焦的过程中，该过程分为以下几个阶段：初步加热（在220°C下，对应于团块生产）；低温热解（温度350–550°C）；并在惰性介质（氮气）中冷却半焦。该过程是放热的。H ₂，CH ₂的释放观察到CO和CO（最大浓度分别为7.0、47.6和31.2vol％）。这些化合物存在于汽-气混合物冷凝后形成的热气态产物中。确定所产生的半焦的特性。研究了其反应性和形态结构的变异性。随着半焦炭样品碳化的增加，可观察到发热量的非线性增加（从30.04到33.02 MJ / kg）。另外，由于形成开放的孔和通道，颗粒的形态也发生了变化。