Structural parameter optimization for novel internal-loop iron–carbon micro-electrolysis reactors using computational fluid dynamics  

作　　者：Lei Zhang Mengyu Wu Yanhe Han Meili Liu Junfeng Niu 

机构地区：[1]Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China [2]Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China

出　　处：《Chinese Journal of Chemical Engineering》2019年第4期737-744,共8页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(21677018);Jointly Projects of Beijing Natural Science Foundation and Beijing Municipal Education Commission(KZ201810017024)

摘　　要：It is generally recognized that internal-loop reactors are well-developed mass and heat-transfer multiphase flow reactors. However, the internal flow field in the internal-loop reactor is influenced by the structure parameter of the reactor, which has a great effect on the reaction efficiency. In this study, the computational fluid dynamics simulation method was used to determine the influence of reactor structure on flow field, and a volume-offluid model was employed to simulate the gas–liquid, two-phase flow of the internal-loop micro-electrolysis reactor. Hydrodynamic factors were optimized when the height-to-diameter ratio was 4:1, diameter ratio was9:1, draft-tube axial height was 90 mm. Three-dimensional simulations for the water distributor were carried out, and the results suggested that the optimal conditions are as follows: the number of water distribution pipes was four, and an inhomogeneous water distribution was used. According to the results of the simulation,the suitable structure can be used to achieve good fluid mechanical properties, such as the good liquid circulation velocity and gas holdup, which provides a good theoretical foundation for the application of the reactor.It is generally recognized that internal-loop reactors are well-developed mass and heat-transfer multiphase flow reactors. However, the internal flow field in the internal-loop reactor is influenced by the structure parameter of the reactor, which has a great effect on the reaction efficiency. In this study, the computational fluid dynamics simulation method was used to determine the influence of reactor structure on flow field, and a volume-offluid model was employed to simulate the gas–liquid, two-phase flow of the internal-loop micro-electrolysis reactor. Hydrodynamic factors were optimized when the height-to-diameter ratio was 4:1, diameter ratio was9:1, draft-tube axial height was 90 mm. Three-dimensional simulations for the water distributor were carried out, and the results suggested that the optimal conditions are as follows: the number of water distribution pipes was four, and an inhomogeneous water distribution was used. According to the results of the simulation,the suitable structure can be used to achieve good fluid mechanical properties, such as the good liquid circulation velocity and gas holdup, which provides a good theoretical foundation for the application of the reactor.

关 键 词：Iron–carbon MICRO-ELECTROLYSIS INTERNAL CYCLING Computational fluid dynamics Structure design 

分 类 号：X703[环境科学与工程—环境工程] TQ052.5[化学工程]