Heat transfer and particulate flow analysis of a 30 kW directly irradiated solar fluidized bed reactor for thermochemical cycling
Heat transfer and particulate flow analysis of a 30 kW directly irradiated solar fluidized bed reactor for thermochemical cycling
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DOI：
10.1016/j.ces.2018.09.012
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发表时间：
2019-08
影响因子：
4.7
通讯作者：
Selvan Bellan;T. Kodama;K. Matsubara;N. Gokon;Hyun-Seok Cho;Kousuke Inoue
中科院分区：
文献类型：
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作者：
Selvan Bellan;T. Kodama;K. Matsubara;N. Gokon;Hyun-Seok Cho;Kousuke Inoue
为了使用非挥发性金属氧化物进行热化学循环来分解水并产生氢气，设计和制造了用于束流配置的直接辐照流化床反应器。由于本研究的主要目的是分析反应器的传热和颗粒流，因此使用化学惰性颗粒。采用离散元法和计算流体动力学相结合的方法建立了瞬态 3D 传热传质模型。使用离散纵坐标辐射模型求解辐射传输。实验验证是通过在 30kWth 高通量太阳能模拟器下测试的流化床反应器原型获得的测量温度来完成的。该模型用于分析不同表观气体速度和床质量下的颗粒流动特性和反应器效率。结果表明，较高的气体流速会增加床层的速度和对流损失，并降低床层温度和反应器的效率。
To perform thermochemical cycles using non-volatile metal oxides to split water and produce hydrogen, a directly irradiated fluidized bed reactor is designed and fabricated for beam-down configuration. As the main aim of this investigation is to analyze the heat transfer and particulate flow of the reactor, chemically inert particles are used. A transient 3D heat and mass transfer model is formulated by the combined approach of discrete element method and computational fluid dynamics. The radiative transfer is solved using the discrete ordinate radiation model. Experimental validation is accomplished by the measured temperatures, obtained with the fluidized bed reactor prototype tested under 30 kWthhigh-flux solar simulator. The model is applied to analyze the granular flow characteristics and efficiency of the reactor for various superficial gas velocities and bed masses. The results indicate that higher gas flow rate increases the velocity and convection loss of the bed and decreases the bed temperature and efficiency of the reactor.