高效厌氧生物反应器内的湍流特性及结构优化

Structure Optimization and Turbulent Flow Characteristics in High Efficient Anaerobic Biological Reactor

采用数值模拟方法研究了高效厌氧生物反应器内的湍流及多相流传质过程。通过重整化群k-ε湍流模型(RNGk-ε)和欧拉多相流模型构建反应器内多相湍流流动控制方程。在此基础上,应用自定义函数(UDF)方式修正了计算流体力学软件Fluent中的曳力模型,并植入欧拉多相流模型,建立高效厌氧生物反应器内气-液-固多相流动模型,并模拟计算了反应器内多相流过程,同时对其结构进行优化。结果表明,修正后的多相流动模型计算得到的流场特征与实验数据吻合,验证了所采用的湍流模型和计算方法的准确性;优化后的反应器内多相流传质效果明显提高。该方法较为准确地预测了反应器内传质过程,可以用于高效厌氧生物反应器的工程应用改进。

The turbulent flow characteristics and multiphase flow mass transfer process in the high efficient anaerobic biological reactor were studied by numerical simulation.Multiphase turbulent flow control equation was built based on RNG k-ε(renormalization group,RNG,k-ε model)turbulent model and Euler multi-phase model,on the basis of which,the gas-liquid-solid multiphase flow model was built by loading the user defined function(UDF)to modify the drag model in Fluent solver and implanting the Euler multi-phase model,and the flow characteristics were calculated and the structure in high efficient anaerobic biological reactor was optimized.The results confirmed that the flow characteristics calculated with modified multiphase model was in reasonable agreement with experimental data,which verified the modified model and calculating method.And the multiphase mass transfer effect was improved obviously in modified reactor.An accurate prediction during the mass transfer process in the reactor could be obtained by the modified multiphase flow model,which could be used for the engineering prediction of high efficient anaerobic biological reactor.