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Modeling of hydrodynamics in microchannel reactor for Fischer-Tropsch synthesis

机译:费-托合成微通道反应器中的流体动力学建模

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摘要

Hydrodynamics of liquid and gaseous products in microchannel reactor for Fischer-Tropsch synthesis is considered. It is supposed, that liquid and gaseous products of the synthesis move downward in annular flow regime. A microchannel with irregular internal walls is investigated in cylindrical symmetry. In proposed numerical technique the peculiarities of coating the microchannel walls by cobalt-based catalytic particles are taken into account. System of equations of two-phase hydrodynamics is based on the generalized equations for mass flowrate and momentum of liquid film and gaseous phase. Stable numerical algorithm for calculation the thermodynamic equilibrium in gas-liquid mixtures of synthesis products is proposed. Calculation results illustrate thermophysical properties of liquid and gaseous products. In the hydrodynamics model variations along a microchannel mass fractions and thermophysical properties of liquid and gaseous products were taking into account. Principal hydrodynamical difference between a smooth microchannel and a microchannel with random roughness is explained. Hydrodynamical parameters and gradient of pressure are investigated as functions of pressure, temperature, averaged diameter of a microchannel and chain growth probability.
机译:考虑了费-托合成中微通道反应器中液体和气体产物的流体动力学。据推测,合成的液体和气体产物在环形流动状态下向下移动。具有不规则内壁的微通道以圆柱对称性进行研究。在提出的数值技术中,考虑了用钴基催化颗粒涂覆微通道壁的特性。两相流体力学方程组基于液膜和气相的质量流量和动量的广义方程。提出了一种稳定的数值算法,用于计算合成产物气液混合物中的热力学平衡。计算结果说明了液体和气体产物的热物理性质。在流体动力学模型中,考虑了沿微通道质量分数的变化以及液态和气态产物的热物理性质。解释了平滑微通道和具有随机粗糙度的微通道之间的主要流体动力学差异。研究流体力学参数和压力梯度随压力,温度,微通道平均直径和链增长概率的函数。

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