超微秸秆光合产氢反应器流场数值模拟

MATHEMATICAL SIMULATION OF FLOW FIELD OF PHOTOSYNTHETIC BACTERIA HYDROGEN PRODUCTION REACTOR

采用CFD技术对超微秸秆光合产氢反应器进行数值模拟和流场分析;基于混合模型得出超微秸秆光合产氢体系速度由较集中的主流区向周围不断发展,逐步达到速度的均匀分布,并且反应器底部存在明显的推流运动,使得沉淀的固体颗粒向前运动,大部分集聚在上流室,液相的冲击力使得上流室内固相分布高度和浓度都明显大于下流室;反应器中大部分区域都存在涡流,底部区域的涡流强度最大,这保障了光合细菌和超微秸秆颗粒的充分混合、接触,强化了传质,起到很好的自动搅拌作用,对进一步研究秸秆光合产氢反应器的工业化应用和运行控制有一定的参考。

The CFD technology was applied to mathematics simulate and flow field analuze of photosynthetic hydro-gen production reactor from ultramicro straw. Based on mixture model, information about flow field was obtained in detail. The flow velocity of photosynthetic hydrogen production reactor evolved from the mainstream to the surround-ing area, and gradually achieved uniform distribution. The bottom of reactor had obvious plug flow movement which made deposited solid particles move forward and assemble in the upflow chamber. The height and the concentrations of solid-phase distribution of upflow chamber were significantly higher than downflow chamber. Eddy current exist- ted in most areas of the reactor and the maximum eddy current was at the bottom of the reactor, which was condu- cive to mix photosynthetic bacteria and straw particles and enhanced mass transfer, and played a very good role in automatic stirring actim. The simulation results about velocity and concentration field will reference to industrializa-tion application and operation control of photosynthetic hydrogen production reactor.