Modeling Biomass Particle Evolution at Pyrolysis Conditions Considering Shrinkage and Chemical Kinetics with Conjugate Heat Transfer
Modeling Biomass Particle Evolution at Pyrolysis Conditions Considering Shrinkage and Chemical Kinetics with Conjugate Heat Transfer
复制标题
考虑收缩和共轭传热的化学动力学，模拟热解条件下的生物质颗粒演化
DOI：
10.1021/acs.energyfuels.2c03892
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发表时间：
2023
期刊：
影响因子：
5.3
通讯作者：
Kong, Song-Charng
中科院分区：
文献类型：
--
作者：
Cho, Yongsuk;Kong, Song-Charng
生物质热解是一种在短时间内生产可再生生物燃料的有吸引力的方法。本文讨论了一种考虑颗粒收缩和反应动力学的计算研究，以表征生物质颗粒热解条件下的演变。一个代表性的基本体积（REV）规模模拟进行了三维解析的气体和固体域。在格子Boltzmann（LB）框架下，采用共轭传热（CHT）和自适应部分饱和方法（PSM）对界面进行了模拟。考虑足够的气体厚度来模拟界面物理，例如热边界层和产物气体外流。使用三个不同的实验来验证电流模拟。颗粒转化时间、温度和收缩率被很好地预测。一项参数研究调查了不同建模方法和操作条件的影响。结果表明，颗粒尺寸、入口气速、反应器温度和几何形状对内部传热有影响。随着颗粒尺寸的增加，傅立叶数减小到几乎恒定的值。Pe 'clet数随反应器温度线性增加。亚颗粒尺度的模拟结果表明，CHT模型和渗透性需要考虑时，模拟气体产物流出的生物质颗粒。三个制度被确定的基础上的颗粒渗透性：扩散限制，混合，对流限制。气体产物流出延迟了混合状态下的总转化。在现有数值研究的基础上，提出了一种修正的传热系数公式。
Biomass pyrolysis is an attractive method to produce renewable biofuel in a short time scale. This paper discusses a computational study considering particle shrinkage and reaction kinetics to characterize biomass particle evolution under pyrolysis conditions. A representative elementary volume (REV) scale simulation was conducted in three dimensions to resolve the gas and solid domains. The interface was modeled using the conjugated heat transfer (CHT) and the adapted partially saturated method (PSM) in the lattice Boltzmann (LB) framework. A sufficient gas thickness was considered to simulate the interface physics, such as the thermal boundary layer and product gas outflux. The current simulation was validated using three different experiments. The particle conversion time, temperature, and shrinkage were well predicted. A parametric study investigated the effect of different modeling approaches and operating conditions. Results show that the internal heat transfer is affected by the particle size, inlet gas velocity, reactor temperature, and geometry. The Fourier number decreases to a nearly constant value as the particle size increases. The Péclet number increases linearly with the reactor temperature. Sub-particle scale simulation results reveal that the CHT model and permeability need to be considered when simulating gaseous product efflux out of the biomass particle. Three regimes are identified based on the particle permeability: diffusion-limited, mixed, and advection-limited. The gaseous product efflux delays the overall conversion in the mixed regime. A modified heat transfer coefficient is formulated based on the current numerical study.
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DOI：
10.1016/j.ijheatmasstransfer.2018.12.034
发表时间：
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影响因子：
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DOI：
--
发表时间：
2005
期刊：
Proceedings of the Combustion Institute 30
影响因子：
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