生化工程第四章搅拌器的型式及流型精.ppt

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1、生化工程第四章搅拌器的型式及流型2023/2/17第三章搅拌器轴功率计算1第1页，本讲稿共26页一、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，本讲稿共26页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，本讲稿共26页二、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，本讲稿共26页Lightnin Mixers Inc第5页，本讲稿共26页Axial Flow ImpellersRe

2、commended 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 and other in-tank devices A100第6页，本讲稿共26页Recommende

3、d 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，本讲稿共26页Recommended for axial-flow impeller for side-entry applications Designed for demanding pulp an

4、d paper applications Also used in other side-entry applications,such as oil storage Features minimal radial flow A312第8页，本讲稿共26页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 7

5、5%Can reduce energy costs up to 45%Improves yields in shear-sensitive processes A315第9页，本讲稿共26页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 des

6、ign delivers better axial motion and reduces power consumption A320第10页，本讲稿共26页Recommended for up-pumping applications Ideal for multi-phase applications,such as fermentation,polymerization and hydrogenation High gas induction from surface Controls foaming A340第11页，本讲稿共26页Recommended for low-viscosi

7、ty 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 LIGHTNIN LFD Flocculator Improves results up to 40%vs.conventional pitched-blade turbines A310/A510第12页，本讲稿共26页Recomm

8、ended 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 conventional pitched-blade impellers Structural composite is lightweight and extremely resistant to corrosion Excellent for us

9、e with acids,caustics,chlorinated solutions and other aggressive chemicals A6000第13页，本讲稿共26页Radial-Flow ImpellersRecommended 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

10、dispersions Moderate pumping action R100第14页，本讲稿共26页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 stainless st

11、eel,high-alloy stainless steel,titanium and compositesR320第15页，本讲稿共26页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 centipoiseR400第16页，本讲稿共26页Recommended for:High-shear applications with

12、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 pigmentsR500第17页，本讲稿共26页Circulator ImpellersRecommended for waste treatment draft tube ci

13、rculators Efficient swept-back design eliminates the large power increase(up to 50%)from fiber build-up on the leading edgeC102第18页，本讲稿共26页Recommended for high-viscosity applications Circulator impeller has high head capability 3 times greater than conventional impellers C104第19页，本讲稿共26页Recommended

14、for mineral draft tube circulatorsUnique airfoil design can increase impeller wear life by 2 to 6 timesC110第20页，本讲稿共26页Chemineer Inc第21页，本讲稿共26页Maxflo WSEFavorable Applications:A high efficiency,advanced side-entering hydrofoil impeller that produces maximum pumping action.It has more cavitation res

15、istance than other designs through effective hydrodynamic design.第22页，本讲稿共26页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 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，本讲稿共26页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，本讲稿共26页2、圆盘涡轮搅拌器第25页，本讲稿共26页第26页，本讲稿共26页