Workshop onElectrostatic Atomization of Electrically

Insulating Liquids : Principles and Applications

Applications of Electrostatic Atomization in Industry

Presented by

Rudolf J. Schick and Michel Thenin,

Spraying Systems Co.

Who is Spraying Systems Co.?

• World Leader in Spray Technology— Headquarters in Wheaton, IL— 10 manufacturing facilities in the Americas, Europe, Asia— 85 local sales engineering offices around the world

• In attendance— Michel Thenin – General Manager and Life Science Global Director— Rudolf J. Schick – Vice President

Spray Performance Factors

Spray Pattern Types

Performance Considerations

• Specific Gravity• Viscosity• Surface Tension• Temperature• Abrasion/Corrosion

• Solid Stream• Flat Spray• Hollow Cone • Full Cone • Fine Spray

— Hydraulic Atomization— Two-fluid Atomization (Air)

• Nozzle Flow Rate/Pressure• Spray Angle/Coverage• Drop Size• ImpactLiquid & Environmental Considerations

Automation & Control Requirements • Intermittent Timing Control• Flow Control• Batch Control• Installation restrictions• Nozzle positioning • Headers & lances

Adaptability

Optimizing spray performance

Spray System

Optimization

Spray Coating• Most Popular Spray Application

• Covers many industries

— Paper

— Steel

— Food

— Pharma

• Generally involves depositing a chemical on a moving target

APPLICATION OF INTEREST

Keys For Success

Optimization of spray distribution/patternation

A B C

D1 D2 D3

SPRAY ANALYSIS

Keys For Success

Optimization of drop size distribution

SPRAY ANALYSIS

Current Practice• General Industrial Applications

— Traditional Flat Fan Nozzles

— Hydraulic Atomization

— Low Cost

— Overlap (Ideal – optimized)

— Drop size (adequate)

— Transfer Efficiency (optimized)

— Adaptability (rigid)

• Higher Precision Industrial Applications

— Two Fluid Nozzles

— Pneumatic Atomization

— High Cost

— Overlap (adequate)

— Drop Size (Ideal – optimized)

— Transfer Efficiency (adequate)

— Adaptability (flexible)

Flat Spray (Tapered)

General Spray Characteristics• Hydraulic Atomization • Usually installed on a header

—Provides uniform coverage - entire target—Overlapping distributions

• Wide range of low rates (.1 – 10 l/min)• Wide range of spray angles (15º – 110º)

Typical Applications

– Spray Coating– Product Washing– Sheeting or Plate Cooling– Moistening

SPRAY PATTERN

Flat Spray Nozzles

Deflector

High Impact

Standard

Hydraulic app to come

Two-Fluid Nozzles

General Spray Characteristics• Pneumatic Atomization (Internal/External Mix)

—Some feature mechanical assist• Usually installed on a header

—Provides uniform drop size distribution• Wide range of flow rate (.1 – 5 lit/min)

Typical Applications• Humidification• Evaporative Cooling• Coating• Moistening• Greenhouse Applications

SPRAY PATTERN

Two-Fluid Nozzles Internal Mix

SPRAY PATTERN

LIQUID

GAS

Air Caps

Round Flat

Air Cap Fluid Cap

AIR

LIQUID

AIR

LIQUID

Two-Fluid NozzlesExternal Mix

SPRAY PATTERN

LIQUID

GAS

Air Caps

Flat Round

AIR

LIQUID

AIR

LIQUID

Current Practice – what we like• General Industrial Applications

— Traditional Flat Fan Nozzles

— Hydraulic Atomization

— Low Cost

— Overlap (Ideal – optimized)

— Drop size (adequate)

— Transfer Efficiency (optimized)

— Adaptability (rigid)

• Higher Precision Industrial Applications

— Two Fluid Nozzles

— Pneumatic Atomization

— High Cost

— Overlap (adequate)

— Drop Size (Ideal – optimized)

— Transfer Efficiency (adequate)

— Adaptability (flexible)

Technology Premise• General Industrial and Higher Precision

applications

— Flat Fan Nozzles

— Efficient Atomization

— Low Cost

— Overlap (Ideal – optimized)

— Drop size (Ideal – optimized)

— Transfer Efficiency (optimized)

— Adaptability (Flexible)

Targeted Spray Deposition

Minimal Waste

Pan Lube System

APPLICATIONS

Chain Lube System

APPLICATIONS

Conclusion

TO COME

• TO COME