Multifluid Modeling of Coal Pyrolysis in a Downer Reactor
Multifluid Modeling of Coal Pyrolysis in a Downer Reactor
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DOI：
10.1021/acs.iecr.5b04150
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发表时间：
2016-02
影响因子：
4.2
通讯作者：
Z. Shu;Chuigang Fan;Songgeng Li;Junwu Wang
中科院分区：
文献类型：
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作者：
Z. Shu;Chuigang Fan;Songgeng Li;Junwu Wang
唐纳反应器是一种很有前途的煤热解反应器，煤热解所需的能量来自于热载体颗粒。然而，基础研究是有限的，尽管它的实际重要性。为此，建立了一个多流体模型来研究下行床反应器中的流体力学，传热，传质和化学反应：质量，动量和能量守恒方程与适当的模型相界面的质量，动量和传热，包括颗粒辐射机制和先进的动力学理论颗粒相应力和颗粒-颗粒阻力系数关闭。物种传输方程，反应动力学模型，和水分蒸发模型也耦合。计算流体动力学模拟结果表明，进料温度对煤热解的影响很大，气固传热和颗粒辐射是主要的传热机制，而颗粒间的直接传热作用很小。
Downer is a promising reactor for coal pyrolysis, where the energy used for coal pyrolysis comes from the heat carrier particles. However, fundamental studies are limited regardless of its practical importance. To this end, a multifluid model is established to study the hydrodynamics, heat, mass transfer, and chemical reaction in a downer reactor: The conservation equations of mass, momentum, and energy are closed with proper models for interphase mass, momentum, and heat transfer, including the particle radiation mechanism and with advanced kinetic theory for particulate phase stresses and particle–particle drag coefficients. Species transport equations, the reaction kinetic model, and the water evaporation model are also coupled. Computational fluid dynamics simulations highlight the importance of feeding temperature in coal pyrolysis and indicate that the gas–solid heat transfer and particle radiation are the major heat transfer mechanisms, whereas the direct particle–particle heat transfer is negligib...