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Dryer Technology

Coming Spring 2024

13 hours


This course focuses on continuous drying of particulate materials from foods to inorganic chemicals.  It will cover both Direct Dryers (flash, fluid bed, rotary, spray) and Indirect Dryers (disc, paddle, rotary, screw flight).  Emphasis will be placed on aqueous-based, continuous, direct dryers.  Attendees will gain a solid understanding of dryer fundamentals and learn how to apply proven methods to solve practical problems and improve operations.  



During this course, you will:

  • Examine the fundamentals of industrial drying
  • Analyze the process design of dryers
  • Address methods for improving dryer efficiency and reducing operating and energy costs throughout the drying system
  • Understand how to conduct dryer surveys as an aid to problem solving and improving operations
  • Learn how to select the proper equipment to fulfill the process objectives
  • Estimate process design requirements 

Course Hours

You Will Earn

You Will Earn

All hours listed are in Central Time

8:00 am – 4:30 pm

8:00 am – 4:00 pm

You Will Earn

You Will Earn

You Will Earn

1.3 Continuing Education Units

13 Professional Development Hours 

Course Text

  

The text for this course is Process Drying Practice, by Edward M. Cook and Harman D. DuMont, McGraw-Hill Publishing Co., 1991. The text is included in the course fee. 

Course Details

Fundamentals: Practical Dryer Theory

  • Theory vs practice
  • Types of dryers
  • Feed and product properties

Drying Systems

  • Basic designs
    • Once-through
    • Closed cycle
    • Superheated steam 
    • Air and product recycle
  • System classes
    • Indirect dryers
    • Direct dryers
  • Limitations and disadvantages
  • Major components
    • Feeders
    • Heaters
    • Collectors
    • Mixers
    • Emission control equipment (scrubbers, thermal oxidation)

Indirect Dryers

  • Heating and heat transfer rate
  • Problems and disadvantages
  • Feeding and solids transport
  • Air use
  • Specific designs
    • Disc
    • Drum
    • Paddle
    • Rotary
    • Screw flight

Direct Dryers

  • Operating modes and air motion
  • Solids transport
  • Feeding and feed rate
  • Air temperature; leakage
  • Air and fuel considerations
  • Moisture
    • Outlet air
    • Final product
  • Specific designs
    • Flash
    • Ring
    • Fluid-bed
    • Rotary
    • Spray
    • Tray and rotary tray

Safety for Combustible Products

  • Explosion Venting
  • Chemical Suppression/Isolation
  • Steam vs. Water Injection

Energy Efficient Schemes

  • Heat Recovery Configurations using Dryer exhaust gases to preheat incoming air
  • Integration of Dryer Exhaust Gases with Evaporators to concentrate liquids 

Process Design Estimating for Dryers

  • Methods for estimating and calculating
  • Indirect dryer methods
  • Direct dryer methods
  • Psychrometric charts
    • Basics
    • Sample calculations
    • Non-aqueous liquids
  • Short-cut charts
  • Quiz

Drying System Surveys

  • Data collection
    • Measurements needed
    • Concerns
  • Survey results: a case study
  • Energy conservation: a case study

Strategies for Improving Operations

  • Laws of conservation for drying
  • Existing systems
  • New systems
  • Uncommon strategies
  • Effects of changes in energy use and production rate

Testing

  • Why tests are needed
  • Test facilities, procedures, and equipment
  • Feed material, feeding, and product properties
  • Sample questionnaire

Selecting the Right Dryer

  • Case studies
  • Feed, product, and dryer characteristics
  • Dryer performance and optimization
  • Dryer testing, sizing, and costing
  • New versus old equipment

Upcoming courses - direct enrollment

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