在直径0.48 m的搅拌槽中以水?空气为介质，对具有双层桨结构的自吸式反应器的流体力学性能进行了实验研究，考察了自吸式桨浸没深度、底层桨结构和搅拌桨层间距对自吸式桨的临界吸气转速、吸气速率和气含率的影响。结果表明，临界吸气转速随自吸式桨浸没深度增加而增加，临界吸气转速几乎与下层桨的结构无关；吸气速率与气含率随浸没深度增加而减小，吸气速率与气含率受下层桨影响较大，层间距为自吸式桨直径(D)且采用上推式的四叶宽叶翼形轴流式桨作下层桨时，自吸式桨的吸气性能最佳。
Stirred tank equipped with a self-inducing impeller is a typical gas–liquid reactor which attracted much concern in recent years. In order to investigate the hydrodynamics characteristics of a four-blade self-inducing impeller and find the optimized impeller combination, experiments were conducted with the air?water system in a tank of 0.48 m diameter. The effects of impeller submergence, impeller spacing and the structure of bottom impeller on the critical impeller speeds of air inducing, gas holdup and gas-inducing rate were investigated. The results showed that the critical impeller speed increased with the increase in impeller submergence, while the critical impeller speed of different double impeller combinations were nearly the same. Although the bottom impeller had a little influence on the critical impeller speed, it obviously influenced global parameters such as the gas-inducing rate and the total gas holdup, which decreased as the impeller submergence increased. Under the same power consumption, when the bottom impeller was WHU (wide hydrofoil pumping up), a good gas-inducing rate and gas holdup were achieved. Impeller spacing also had influence on gas-inducing rate and gas holdup. When the impeller spacing was equal to a diameter of the self-inducing impeller, the latter showed the optimal performance on gas-inducing and gas holdup. The influence of impeller submergence and impeller rotation speed on gas-inducing rate, gas holdup and relative power demand (RPD) of gas-inducing impeller can be taken into account by introducing a modified Froude number to help the design of stirred tank.
[1] Hong H S, Cai Z J, Li J Q, et al. Simulation of gas-inducing reactor couples gas–liquid mass transfer and biochemical reaction[J]. Biochemical Engineering Journal, 2014, 91(91):1-9.
[2] 刘甜甜, 李玉刚, 郑世清. CFD在自吸式加氢反应器流场研究中的应用[J]. 化工进展, 2017, 36(3):846-851.
LIU T T, LI Y G, ZHENG S Q. Flow field characteristics of gas-inducing hydrogenation reactor with CFD simulation [J]. Chemical Industry and Engineering Progress, 2017, 36(3):846-851.
[3] Jiang L, Li A, Tang S. An Experimental Study on Carbon Dioxide Hydrate Formation Using a Gas-Inducing Agitated Reactor[J]. Energy, 2017:S0360544217310150.
[4] 张津津, 高正明, 蔡雅婷, et al. 多层组合桨搅拌槽内通气功率和传质性能研究[J]. 北京化工大学学报：自然科学版, 2015, 42(5):41-46.
ZHANG J J, GAO Z M, CAI Y T, et al. Power consumption and mass transfer for various impeller
combinations in a stirred tank[J]. Journal of Beijing University of Chemical Technology ( Natural Science), 2015, 42(5):41-46.
[5] Ye Q , Li Z , Wu H . Principle and Performance of Gas Self-inducing Reactors and Applications to Biotechnology[M]. Springer Berlin Heidelberg, 2015: 1-33.
[6] Zhang J , Gao Z , Cai Y , et al. Power consumption and mass transfer in a gas-liquid-solid stirred tank reactor with various triple-impeller combinations[J]. Chemical Engineering Science, 2017:S0009250917301008.
[7] Achouri R , Hamza S B , Dhaouadi H , et al. Volumetric mass transfer coefficient and hydrodynamic study of a new self-inducing turbine[J]. Energy Conversion and Management, 2013, 71:69-75.
[8] 李波, 张庆文, 洪厚胜. 气体自吸式反应器的研究进展[J]. 化工进展, 2008, 27(11):1728-1735.
LI B, ZHANG Q W, HONG H S. Research progress of gas-inducing reactor [J]. Chemical Industry and Engineering Progress, 2008, 27(11):1728-1735.
[9] 鞠凡，程振民，陈建华，et al.双层桨结构自吸式反应器的气含率[J]. 华东理工大学学报(自然科学版), 2009, 35(5)：667-672.
JU F, CHENG Z M, CHEN J H. Gas Hold-up in a Gas Self-inducing Contactor Equipped with Double Layered Impellers[J]. Journal of East China University of Science and Technology(Natural Science Edition) , 2009, 35(5)：667-672.
[10] Deshmukh N A, Patil S S, Joshi J B. Gas Induction Characteristics of Hollow Self-Inducing Impeller[J]. Chemical Engineering Research & Design, 2006, 84(2):124-132.
[11] 秦佩, 郝惠娣, 冯蓉蓉, et al. 自吸式气液搅拌槽气液分散性能的实验研究[J]. 化工技术与开发, 2012, 41(8):40-43.
QIN P, HAO H D, FENG R R, et al. Experiment Study of Gas-liquid Dispersion Performance Inside Self-inspirating Tank[J]. Technology & Development of Chemical Industry, 2012, 41(8):40-43.
[12] 赵春霞, 满瑞林, 余嘉耕. 自吸式搅拌反应器制备纳米碳酸钙新工艺研究[J]. 非金属矿, 2002, 25(5):20-22.
ZHAO C X, MAN R L, YU J G. A New Process Research on Preparation of Nanometer Calcium Carbonate Using Self-suction Stirred Reactor [J]. Non-Metallic Mines, 2002, 25(5):20-22.
[13] Hsu Y C , Huang C J. Ozone Transfer with Optimal Design of a New Gas-Induced Reactor[J]. Aiche Journal, 2010, 43(9):2336-2342.
[14] Hsu Y C, Chen J T, Yang H C, et al. Decolorization of dyes using ozone in gas-induced a reactor (p 169-176)[J]. Aiche Journal, 2010, 47(1):169-176.
[15] Fonte, Cláudio P, Pinho B S , Santos-Moreau V , et al. Prediction of the Induced Gas Flow Rate from a Self-Inducing Impeller with CFD[J]. Chemical Engineering & Technology, 2014, 37(4):571-579.
[16] Ju F , Cheng Z M , Chen J H , et al. A novel design for a gas-inducing impeller at the lowest critical speed[J]. Chemical Engineering Research & Design, 2009, 87(8):1069-1074.
[17] Raidoo A D, Rao K S M S R, Sawant S B , et al. IMPROVEMENTS IN GAS INDUCING IMPELLER DESIGN[J]. Chemical Engineering Communications, 1987, 54(1-6):241-264.
[18] Poncin S, Nguyen C, Midoux N, et al. Hydrodynamics and volumetric gas–liquid mass transfer coefficient of a stirred vessel equipped with a gas-inducing impeller[J]. Chemical Engineering Science, 2002, 57(16):3299-3306.
[19] Saravanan K, Mundale V D, Patwardhan A W, et al. Power Consumption in Gas-Inducing-Type Mechanically Agitated Contactors[J]. Industrial & Engineering Chemistry Research, 1996, 35(5):1583-1602.
