【摘要】 光生物反应器内光能分布和吸收除了受到微藻细胞的影响还受到气泡的影响,采用离散坐标模型(DOM)对三维光生物反应器内不同气含率和气泡直径对光能分布情况的影响进行研究,同时研究了小球藻对不同颜色光的体积平均光能吸收率(ALVREA)。结果表明:气泡的存在使得靠近光源位置光强度提高,光衰减加速;当气泡直径为3mm、气含率为7.5%时,体积平均光能吸收率最高,对不同光波段光能吸收研究表明小球藻对波长为400~500nm的光波段有着最高的光能吸收率,计算结果可用于光生物反应器的设计优化及光源系统的选择及设计。更多还原

【Abstract】 The light intensity distribution and light energy absorption are affected by the microalgae and the bubbles in the photobioreactor(PBR).The discrete ordinate model(DOM)was used to simulate the light distribution affected by gas holdups and bubble sizes in 3 dimensions PBR.The average local volumetric rates of energy absorption(ALVREA)for different bands of light were proposed.The results showed that the light intensity near light tube was higher and the light attenuation was also faster than those without bubbles in reactor.ALVREA was the best in PBR at 3mm of the bubble diameter and 7.5%of the gas holdup.Researches on different light bands showed that Chlorella sp.had a greater absorption rate for light at 400-500 nm than any other light band.The results can be used in the design of PBRs and the choice of light system.更多还原