微藻光生物反应器内辐射传输特性研究

The Investigation of the Radiative Transfer Properties in the Microalgae Photobioreactor

基于有限体积法和米氏方程,本文研究了一维和二维平板气升式反应器内,入射光分别为平行光和漫射光时,反应器内藻类密度以及气泡体积率对反应器内投射辐射力分布和制氢率的影响。研究发现,当反应器内只有藻类且吸收占优时,平行光入射时投射辐射力近似按Beer定律衰减,衰减率小于漫射光。当有气泡存在时,平行光入射条件下投射辐射力衰减不能简单按Beer定律考虑,尤其是当反照率较大时。同时,在平行光入射反应器的情况下,反应器内藻类制氢率大且有效光合作用区大,更有利于藻类制氢。

Based on the Finite Volume Method(FVM) and the Michaelis-Menten equation,the effects of the densities of the algae and the bubbles on the irradiance and the hydrogen production rate in the photobioreactor are studied,when the diffused light and the coUimated light pass through the one-dimension and the two-dimension flat panel airlift reactors,respectively.The research reveals that for only the algae cells in the photobioreactor and dominant absorption,the irradiance of the coUimated light approximately attenuates according to the Beer law and the attenuation rate is smaller than that of the diffused light.When the reactor also contains the bubbles,the attenuation of the coUimated light cannot be studied according to the Beer law simply,especially for larger albedo.Meanwhile,the hydrogen production rate and the effective photosynthesis area of the coUimated light incidence is greater than that of the diffused light incidence,which is in favor of hydrogen production.