Residence time distribution of wood chips in a semi-industrial multiple hearth furnace using RFID tracers

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL Particuology Pub Date : 2024-04-11 DOI:10.1016/j.partic.2024.03.009

Elie Lacombe , Muriel Marchand , Capucine Dupont , Denis Maréchal , Thierry Melkior

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Abstract

In continuous biomass torrefaction plants, the products' yields, composition and homogeneity highly depend on the residence time of particles. A characterization of particle residence time distribution (RTD) was therefore carried out in an industrial-scale multiple hearth furnace on poplar wood chips using radio frequency identification tracers. The effects of operating conditions, namely, mass flow rate of biomass, shaft speed of the rabbling system and interdental length on the RTD were studied. The increase of shaft speed and mass flow rate reduces particles’ mean residence time. Lowering the length between two successive teeth also increases the bed speed. Uncontrollable biomass accumulation (also called “bulldozing”) was observed during several tests. This phenomenon is favored by a high mass flow rate of resources, a small interdental length between the teeth and a low shaft speed. RTD measurements were compared to the axial dispersion model. For all tests, the Peclet number is ranging between 20 and 62, indicating that the multiple hearth furnace cannot be modelled as an ideal plug flow reactor.

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使用射频识别（RFID）追踪器测量木屑在半工业化多层炉中的停留时间分布

在连续式生物质热解设备中，产品的产量、成分和均匀性在很大程度上取决于颗粒的停留时间。因此，我们使用射频识别示踪剂在工业规模的多层炉中对杨木屑的颗粒停留时间分布（RTD）进行了表征。研究了运行条件（即生物质的质量流量、耙齿系统的轴速和齿间长度）对 RTD 的影响。轴速和质量流量的增加缩短了颗粒的平均停留时间。降低两个连续齿间的长度也会增加床速。在几次试验中观察到了无法控制的生物质堆积（也称为 "推土机"）。资源质量流量大、齿间长度小和轴转速低都有利于这种现象的发生。热电阻测量结果与轴向弥散模型进行了比较。在所有测试中，佩克莱特数都在 20 到 62 之间，这表明多层炉不能被模拟为理想的塞流反应器。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.