Selecting Agitator Blades for Stainless Steel Reactors

Principle of Blade Selection

• High-Speed Blades: Promote rapid mixing, ideal for gas-liquid dispersion or suspension of fine particles.
• Low-Speed Blades: Ensure gentle agitation, preventing shear-sensitive materials from degradation.

Key Determinants for Selection

1. Mixing Objectives:
   • Homogenization: Requires high-intensity mixing (e.g., emulsifying liquids).
   • Heat Transfer: Demands blades that enhance fluid circulation near the reactor walls.
   • Solid Suspension: Calls for blades generating strong radial or axial flows.
2. Fluid Viscosity:
   • Low Viscosity Fluids (<100 cP): High-speed blades like propellers or turbines excel.
   • High Viscosity Fluids (>1000 cP): Anchor, paddle, or ribbon blades prevent dead zones.
3. Reactor Size & Geometry:
   • Small reactors (≤100L): Compact blades with high tip speeds are sufficient.
   • Large reactors (≥1000L): Multi-stage or wide-span blades ensure uniform mixing.
4. Operational Conditions:
   • Temperature and pressure impact material compatibility (e.g., corrosion-resistant alloys for harsh environments).

Common Blade Types and Applications

Case Study: High-Shear Agitator Delivery

Best Practices for Selection

1. Customization: Tailor blade geometry (pitch, diameter, number of blades) to specific process needs.
2. Baffle Installation: Use baffles in turbulent systems to prevent vortex formation and enhance mixing efficiency.
3. Material Compatibility: Opt for 304 or 316L stainless steel blades for corrosion resistance in chemical environments.