不同热流下光催化反应器内光强分布模拟

Simulation Study of Light Intensity Distribution in Photocatalytic Reactor under Different Heat Flows

研究了不同热流密度下反应器内部光子分布和吸收规律。对反应器内的固-液两相流动过程进行数值模拟,得到不同工况下的催化剂颗粒分布;再以此为基础,利用蒙特卡洛法和六通量模型模拟反应器内部的光子分布规律。研究结果表明,对颗粒分布而言,辐射热源为弱影响因素。在合适的浓度范围内,辐射热源能明显提高局部光子吸收率。在内热源一定时,增加浓度,也能明显提高光子局部吸收率,但增加到一定程度后,增幅逐渐变小。

The distribution and absorption of photons inside the reactor under different heat flux densities are studied. The solid-liquid two-phase flow process in the reactor was numerically simulated, and the catalyst particle distribution under different working conditions was obtained. Based on this, the Monte Carlo method combined with the six-flux model was used to simulate the photon distribution inside the reactor. The results show that the radiant heat source is a weak factor for particle distribution. In a suitable concentration range, the radiant heat source can significantly improve the local photon absorption rate. When the internal heat source is constant, increasing the concentration can also significantly improve the local absorption rate of photons, but after increasing to a certain level, the increase gradually becomes smaller.