Industrial machinery for material handling and drying represents a substantial upfront investment. For bulk material handling applications, drying equipment is typically expected to operate for decades. Selecting inefficient technology can significantly increase operational costs across all related processes. Assessing the specific equipment characteristics used in material handling is crucial to ensure long-term efficiency and cost-effectiveness.
Drying processes in industrial applications are inherently complex, requiring careful consideration of multiple factors. This includes leveraging the expertise of industry professionals, understanding the underlying science, and evaluating real-world performance. Making informed decisions at the outset can optimize operational outcomes and reduce costs over time.
Choosing the Best Technologies for Material Handling & Drying
The industrial drying process for bulk materials is relatively simple on its surface. Drying technologies simply involve using various means to remove moisture during material handling. Drying processes for bulk materials are primarily performed to prepare them for further processing or longer-term storage.
Considerations for drying of bulk material include:
- Cost: The upfront cost of any industrial drying machine often serves as a determinant, though it shouldn’t be the primary one as operational costs tend to be lower with pricier and more advanced drying equipment.
- Efficiency: Machine efficiency should be considered alongside capital costs, as more efficient material handling by drying equipment will directly affect operational costs and affect overall expenses over time.
- Heat reaction: Certain materials react when exposed for too long to high temperatures, causing them to burn, melt or otherwise break down in an unwelcome manner, which is why determining how heat is applied during processing is so important.
- Material density: Particle density affects the removal of moisture during material handling; drying behavior of a material differs depending on its density, which requires different methods for denser and less dense materials.
- Material handling: Drying wet material often requires that processing equipment use non-stick surfaces or specialized paddles to maintain material flow of more viscous substances that could plug the line.
- Moisture content: As a process performed during material handling, drying depends on where the moisture is contained, since surface moisture can be easily vaporized whereas moisture absorbed by the material will require more thorough drying.
- Operational needs: A prime consideration is how a facility operates and whether it requires batch or continuous drying methods; additionally, dryers shouldn’t be oversized as this will increase energy costs, reducing overall plant efficiency.
- Particle size: The smaller the particle size, the less energy it takes to dry a material, as smaller particles have larger surface areas so dry more quickly.
- Properties: Material characteristics like abrasiveness or fragility must be considered during material handling, with drying equipment requiring abrasive-resistant construction materials or set up to ensure gentler processes.
- Testing: In material handling, drying processes often require manufacturers to test both their equipment and the product being processed to determine industrial dryer sizing.
Bulk Material Handling & Drying Equipment
When it comes to bulk material handling, drying machinery comes in all different capacities, shapes, sizes, specifications and types. More importantly, the mechanism by which material is dried varies, depending on the exact application involved in material handling. Drying done for industrial applications often use rotary, fluid bed or flash dryers, though each of these are often customized for specific purposes.
Rotary Dryer
Rotary dryers are often used with bulk solids, using hot air or heated gas during material handling to dry moisture-laden product either directly or indirectly. The key component of a directly heating rotary dryer is a long drum set at a downward angle that slowly rotates, causing material to fall through a heated gas stream. For an indirect rotary dryer, this heated gas stream is separated by a metal plate or tubing from the material. Handling and drying can be performed either by a batch or continuous drying process.
Rotary dryer advantages include:
- Economical to run and low maintenance
- Larger capacity than other drying technologies
- Lifters help maximize the amount of contact between heated gas and product
- Lower capital costs (unless made with stainless steel)
- More efficient for higher heat applications
- Particle size doesn’t affect operation
Rotary dryer disadvantages include:
- Can interrupt flow, especially when material is extremely fine
- Dries heat-sensitive products less efficiently
- Hard to clean
- Heated gases only come into contact with product for short periods
- Less efficient at lower temperatures so requires greater airflow
- Requires a lot of space
In bulk material handling, drying of products like ceramics, fertilizers, limestone, minerals, potash, spent grain, sulfates and wood chips are typical applications.
Specifications for Heyl Patterson rotary dryers
Fluid Bed Dryers
Handling and drying of granular and powdered material are often used in pharmaceutical applications using fluid bed dryers. They work by passing hot air across a perforated bed on which moist solids are pressurized until they’re lifted upwards. Once off the bed, they’re heated within a stream of hot air, where the material’s moisture is vaporized. During material handling, drying may also occur so that some of this moisture is recycled.
Fluid bed dryer advantages include:
- Deals with fragile materials well
- Easy-to-control and stable system
- Generally low maintenance costs
- Generates substantial heat due to the constant commingling of heated gas and particles to ensure efficient moisture removal
- Handles a varied assortment of material
- Heated air is constantly in contact with material
- Internal back-mixing with vibrating units allows for processing of more viscous materials
- Requires comparatively little capital investment
- Very thermally efficient when used with internal heat exchanger
- Works well with heat-sensitive products due to multiple stages of material handling and drying
Fluid bed dryer disadvantages include:
- Highly flammable and toxic materials can result in fire or explosions
- If organic solvents are to be removed during material handling, drying process is imperfect
- Lower temperatures require more airflow
- Needs sizable volume of gas to maintain thermal efficiency
- Poor fluidization of very moisture-laden material
- Requires isolated vibrations
- Uses considerable amounts of energy to suspend moist material in gas stream
- Works only with friable materials
For bulk material handling applications, drying with fluid bed dryers works well for materials that include agglomerates, breadcrumbs, catalysts, ceramic beads, fertilizers, nuts, PVC powder, seeds, and wood flour.
Specifications for Heyl Patterson fluid bed dryers
Flash Dryers
At the point at which they’re fed, these are very much like industrial versions of air dryers used in public restrooms. Also known as a pneumatic dryer, flash drying involves rapid evaporation that primarily removes moisture at the feeding point, with any remaining moisture diffusing throughout the product during later stages of material handling. Drying via this method allows for a variable retention of moisture, from none to as high as 12 percent. Other variants allow recycling of larger particles or providing inline size reduction to assist with drying.
Flash dryer advantages include:
- Allows for small, medium or large batches to be dried cost-effectively
- Easy to construct
- Good for heat-sensitive products due to short retention time
- Handles finer powders well
- Imparts cooling effect on product while drying
- Provides inbuilt pneumatic conveying
- Reduces moisture very quickly
- Results in little overall loss of material
- Takes less energy when compared to other drying techniques
Flash dryer disadvantages include:
- Causes agglomerates to break apart
- Doesn’t handle heavier powders well
- Larger and more oddly shaped particles tend not to dry uniformly
- Less effective at reaching lowest possible moisture content
- Less efficient due to considerable quantity of air used
- Not suitable for abrasive material
- Process controls needed to avoid reduction in product quality for certain heat-sensitive material
- Sometimes wet feed requires back-mixing with already dry materials
The construction of these industrial dryers is relatively simple and is typically used in an array of industries during material handling. Drying with flash dryers is best for materials like dyes, fibers, finer chemicals, food, minerals, pharmaceuticals, pigments, plastic pellets and starches.
Specifications for Heyl Patterson flash dryers
To learn more about material handling and drying equipment made by Heyl Patterson Thermal Processing, contact us today.
Last updated on December 18th, 2025 at 03:54 pm