Simulation investigation of drying characteristics of wet filamentous biomass particles in a rotary kiln
Simulation investigation of drying characteristics of wet filamentous biomass particles in a rotary kiln
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DOI：
10.1016/j.fuproc.2018.07.001
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发表时间：
2018-09
影响因子：
7.5
通讯作者：
Conghui Gu;Zhulin Yuan;Shanshan Sun;Lei Guan;Kai Wu
中科院分区：
文献类型：
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作者：
Conghui Gu;Zhulin Yuan;Shanshan Sun;Lei Guan;Kai Wu
生物质是可再生能源的重要组成部分，其物理性质和结构具有高含水率、非均匀粒度和低密度等特点。在回转窑中对丝状生物质颗粒进行湿式干燥，以获得适宜的含水率。为了研究生物质颗粒的干燥特性，建立了生物质颗粒的传热传质数学模型。将选择条件下的丝状生物质颗粒实验与模拟结果进行了比较，验证了数学模型的可行性。此外，用转鼓温度、气流速度和气流温度描述了湿丝状生物质颗粒与气流之间的热量和质量传递。目的是在干燥过程中获得更多关于温度、水分含量和湿丝状生物质颗粒在回转窑内水分蒸发率的信息。模拟结果表明，滚筒温度对颗粒的干燥行为有很大的影响。气体流动特性对颗粒的温度和水分含量影响不大。结果表明，所建立的模型为研究湿丝状生物质颗粒的干燥特性提供了有效的方法。
Biomass is an important part of renewable energies and characterized by physical properties and structures, including high moisture content, heterogeneous size, and low density. Wet filamentous biomass particle drying was performed in a rotary kiln, aiming to get the appropriate moisture content. To investigate the drying characteristics of biomass particles, a mathematical model on the heat and mass transfer was proposed. Experiments with filamentous biomass particles under selected conditions were compared to simulations and the feasibility of mathematical models was verified. Furthermore, the transfer of heat and mass between the wet filamentous biomass particle and gas flow was described in terms of rotary drum temperatures, gas flow velocities and gas temperatures. The aim was to gain more information on temperature, moisture content, and the moisture evaporation rate of wet filamentous biomass particles within a rotary kiln during drying processes. The simulation results indicated that the drum temperature could greatly affect the drying behaviors of particles. The temperature and moisture content of particles were marginally affected by properties of the gas flow. The results show that the proposed models offer effective methods to investigate the drying characteristics of wet filamentous biomass particles.