生化工程第四章1(搅拌器的型式及流型).ppt

1、2020/7/22,第三章搅拌器轴功率计算,1,第三章 机械搅拌轴功率计算,搅拌目的 提高气液传递速率：打碎气泡，增大气液相的接触面积；使培养液产生涡流，延长气泡在液体中的停留时间，增大H0；减小气泡外滞流液膜的厚度，从而减小传递过程中的阻力。 混合物料，增强传质和传热效果,2020/7/22,第三章搅拌器轴功率计算,2,一、机械搅拌通风发酵罐（简介）,2020/7/22,第三章搅拌器轴功率计算,3,H/D=2; d/D=1/3; B=0.1D ha=0.25D S=3d C=d 式中：H罐高; D罐的直径; d搅拌器直径; B 挡板宽度; ha封头高度 ; S两挡搅拌器之间距离；C底挡搅拌器

2、与下封头底之间距离,2020/7/22,第三章搅拌器轴功率计算,4,二、搅拌器的型式及流型,（一）型式 轴向推进：螺旋桨式 径向推进：涡轮式 1、型式,2020/7/22,第三章搅拌器轴功率计算,5,Lightnin Mixers Inc,2020/7/22,第三章搅拌器轴功率计算,6,Axial Flow Impellers,Recommended for applications requiring moderate pumping action and powder-wetting capabilities Superpitch design 1.5 pitch ratio for gr

3、eater mixing capabilities Standard axial flow Optional ring guard prevents damage from dip tubes, temperature probes and other in-tank devices,A100,2020/7/22,第三章搅拌器轴功率计算,7,Recommended for low- to medium-viscosity, flow-controlled applications Classic 45 pitched blade design Produces a desirable bala

4、nce of flow and shear The impeller of choice in many standard applications,A200,2020/7/22,第三章搅拌器轴功率计算,8,Recommended for axial-flow impeller for side-entry applications Designed for demanding pulp and paper applications Also used in other side-entry applications, such as oil storage Features minimal

5、radial flow,A312,2020/7/22,第三章搅拌器轴功率计算,9,Recommended for gas-liquid dispersion and mass transfer-controlled applications Can improve mass transfer by 30% compared with Rushton turbines Decreases shear rates up to 75% Can reduce energy costs up to 45% Improves yields in shear-sensitive processes,A315

6、,2020/7/22,第三章搅拌器轴功率计算,10,Recommended for higher-viscosity applications requiring high flow in the transitional flow regime Reduces blend time by half Shear rates are modest for both high- and low-viscosity conditions Fluid foil design delivers better axial motion and reduces power consumption,A320,

7、2020/7/22,第三章搅拌器轴功率计算,11,Recommended for up-pumping applications Ideal for multi-phase applications, such as fermentation, polymerization and hydrogenation High gas induction from surface Controls foaming,A340,2020/7/22,第三章搅拌器轴功率计算,12,Recommended for low-viscosity flow-controlled applications Varyin

8、g angle options optimize processes by changing the impeller diameter/tank ratio Maximizes flow with ability to add shear options Standard on the LIGHTNIN LFD Flocculator Improves results up to 40% vs. conventional pitched-blade turbines,A310/A510,2020/7/22,第三章搅拌器轴功率计算,13,Recommended for low viscosit

9、y flow-controlled applications in hostile environments Very low shear and higher flow than any other impeller Maintains flow and reduces power to 45% of conventional pitched-blade impellers Structural composite is lightweight and extremely resistant to corrosion Excellent for use with acids, caustic

10、s, chlorinated solutions and other aggressive chemicals,A6000,2020/7/22,第三章搅拌器轴功率计算,14,Radial-Flow Impellers,Recommended for high-shear mixing and gas-liquid applications Radial design provides shear to achieve good contacting for liquid-liquid dispersions and emulsions Also recommended for gas disp

11、ersions Moderate pumping action,R100,2020/7/22,第三章搅拌器轴功率计算,15,Recommended for copper extraction pumping systems Produces higher-efficiency, lower-power flow patterns Increased hydraulic efficiency permits use of smaller gearboxes Reduced installed horsepower for lower energy costs Available in 316 s

12、tainless steel, high-alloy stainless steel, titanium and composites,R320,2020/7/22,第三章搅拌器轴功率计算,16,Recommended for higher-viscosity applications Contoured two-bladed anchor design For use in blending and heat transfer, with viscosities from 10,000 to 100,000 centipoise,R400,2020/7/22,第三章搅拌器轴功率计算,17,R

13、ecommended for: High-shear applications with elements that are difficult to disperse Provides the highest shear of all LIGHTNIN impeller designs Excellent for high-shear, solid-liquid and liquid-liquid applications Typically used with difficult-to-dispense pigments,R500,2020/7/22,第三章搅拌器轴功率计算,18,Circ

14、ulator Impellers,Recommended for waste treatment draft tube circulators Efficient swept-back design eliminates the large power increase (up to 50%) from fiber build-up on the leading edge,C102,2020/7/22,第三章搅拌器轴功率计算,19,Recommended for high-viscosity applications Circulator impeller has high head capa

15、bility 3 times greater than conventional impellers,C104,2020/7/22,第三章搅拌器轴功率计算,20,Recommended for mineral draft tube circulators Unique airfoil design can increase impeller wear life by 2 to 6 times,C110,2020/7/22,第三章搅拌器轴功率计算,21,Chemineer Inc,2020/7/22,第三章搅拌器轴功率计算,22,Maxflo WSE,Favorable Applications

16、: A high efficiency, advanced side-entering hydrofoil impeller that produces maximum pumping action. It has more cavitation resistance than other designs through effective hydrodynamic design.,2020/7/22,第三章搅拌器轴功率计算,23,Favorable Applications: Good cost effective impeller for low concentrations of immiscible liquid or gas. Two very strong trailing vortices are shed from each blade. These areas of high shear are responsible