生化工程第四章搅拌器的型式及流型幻灯片.ppt

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1、生化工程第四章搅拌器的型式及流型2022/10/4第三章搅拌器轴功率计算1第1页，共26页，编辑于2022年，星期日一、机械搅拌通风发酵罐（简介）一、机械搅拌通风发酵罐（简介）第2页，共26页，编辑于2022年，星期日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底挡搅拌器与下封头底之间距离第3页，共26页，编辑于2022年，星期日二、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、型式第4页，共26页，编辑于2022年，星期日Lightnin Mix

2、ers Inc第5页，共26页，编辑于2022年，星期日Axial Flow ImpellersRecommended for applications requiring moderate pumping action and powder-wetting capabilities Superpitch design 1.5 pitch ratio for greater mixing capabilities Standard axial flow Optional ring guard prevents damage from dip tubes,temperature probes a

3、nd other in-tank devices A100第6页，共26页，编辑于2022年，星期日Recommended for low-to medium-viscosity,flow-controlled applications Classic 45 pitched blade design Produces a desirable balance of flow and shear The impeller of choice in many standard applications A200第7页，共26页，编辑于2022年，星期日Recommended for axial-fl

4、ow 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 radial flow A312第8页，共26页，编辑于2022年，星期日Recommended for gas-liquid dispersion and mass transfer-controlled applications Can improve

5、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第9页，共26页，编辑于2022年，星期日Recommended for higher-viscosity applications requiring high flow in the transitional flow regime Reduces blend tim

6、e 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第10页，共26页，编辑于2022年，星期日Recommended for up-pumping applications Ideal for multi-phase applications,such as fermentation,polymerization and hydrog

7、enation High gas induction from surface Controls foaming A340第11页，共26页，编辑于2022年，星期日Recommended for low-viscosity flow-controlled applications Varying angle options optimize processes by changing the impeller diameter/tank ratio Maximizes flow with ability to add shear options Standard on the LIGHTNI

8、N LFD Flocculator Improves results up to 40%vs.conventional pitched-blade turbines A310/A510第12页，共26页，编辑于2022年，星期日Recommended for low viscosity flow-controlled applications in hostile environments Very low shear and higher flow than any other impeller Maintains flow and reduces power to 45%of conven

9、tional pitched-blade impellers Structural composite is lightweight and extremely resistant to corrosion Excellent for use with acids,caustics,chlorinated solutions and other aggressive chemicals A6000第13页，共26页，编辑于2022年，星期日Radial-Flow ImpellersRecommended for high-shear mixing and gas-liquid applicat

10、ions Radial design provides shear to achieve good contacting for liquid-liquid dispersions and emulsions Also recommended for gas dispersions Moderate pumping action R100第14页，共26页，编辑于2022年，星期日Recommended for copper extraction pumping systems Produces higher-efficiency,lower-power flow patterns Incre

11、ased hydraulic efficiency permits use of smaller gearboxes Reduced installed horsepower for lower energy costs Available in 316 stainless steel,high-alloy stainless steel,titanium and compositesR320第15页，共26页，编辑于2022年，星期日Recommended for higher-viscosity applications Contoured two-bladed anchor design

12、 For use in blending and heat transfer,with viscosities from 10,000 to 100,000 centipoiseR400第16页，共26页，编辑于2022年，星期日Recommended 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 an

13、d liquid-liquid applications Typically used with difficult-to-dispense pigmentsR500第17页，共26页，编辑于2022年，星期日Circulator ImpellersRecommended 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 edgeC102第18

14、页，共26页，编辑于2022年，星期日Recommended for high-viscosity applications Circulator impeller has high head capability 3 times greater than conventional impellers C104第19页，共26页，编辑于2022年，星期日Recommended for mineral draft tube circulatorsUnique airfoil design can increase impeller wear life by 2 to 6 timesC110第20

15、页，共26页，编辑于2022年，星期日Chemineer Inc第21页，共26页，编辑于2022年，星期日Maxflo WSEFavorable Applications: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.第22页，共26页，编辑于2022年，星期日Fav

16、orable 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 for breaking the larger droplets to smaller droplets.Maximum aeration numbers should be limited to 0.1.D-6 or Rushton Impeller第23页，共26页，编辑于2022年，星期日2、螺旋桨式搅拌器 形成轴向的螺旋流动，混合效果较好，剪切率较低，对气泡的分散效果较差。第24页，共26页，编辑于2022年，星期日2、圆盘涡轮搅拌器第25页，共26页，编辑于2022年，星期日第26页，共26页，编辑于2022年，星期日