Wet particles / Fluidization review
Fluid Bed Dryer
A fluid bed dryer passes process air through a bed of wet particles. It may suit powders, crystals or granules that can fluidize. Share particle size, bulk density and moisture data before choosing a layout. Sticky feed, very fine dust and fragile particles need a process trial.
Portfolio Demo · No equipment sales or live enquiries
A Good Fit When
Wet particles form a stable moving bed during trials. The process needs moisture removal while keeping particle properties within agreed limits. A cooling stage may follow drying.
Not the First Choice When
The feed is a liquid, strongly sticky or easily damaged. A wide size distribution can make uniform treatment difficult. Do not select a bed before testing these conditions.
01 / Keep feed and output separate
Sample Specifications
Sample specification data for website demonstration only. Do not use for equipment selection or purchasing.
Sample scenarios, not rated machine capacities. Values marked “Supplier to confirm” need project data and testing.
| Parameter | Unit | F-01 | F-02 | Basis / status |
|---|---|---|---|---|
| Feed type | — | Wet granules | Wet granules | Assumed input |
| Operating mode | — | Continuous | Continuous | Illustrative process |
| Wet feed rate | kg/h | 100 | 200 | Assumed input |
| Inlet moisture | wt%, wet basis | 20 | 20 | Assumed input |
| Final moisture | wt%, wet basis | 5 | 5 | Assumed target |
| Dried material output | kg/h | 84.21 | 168.42 | Calculated example |
| Water evaporation | kg/h | 15.79 | 31.58 | Calculated example |
| Commercial model | — | No model assigned | No model assigned | Supplier to confirm |
| Particle distribution / bulk density | µm or mm / kg/m³ | Feed test required | Feed test required | Supplier to confirm |
| Air volume / retention time | m³/h at stated conditions / min | Process trial required | Process trial required | Supplier to confirm |
| Inlet air / product temperature | °C | Process trial required | Process trial required | Supplier to confirm |
| Power / heat source / footprint | kW / type / mm | Project-specific | Project-specific | Supplier to confirm |
Dry solids = wet feed × 0.80. Dried material = dry solids ÷ 0.95. Evaporation = wet feed − dried material. These calculations retain all dry solids and ignore losses. They do not set the bed size, air volume or drying time.
02 / Describe the particles
Project Data Required
Send a representative size distribution, including fines, rather than one average size. Mark missing values as “Unknown”.
- Particle behaviour
- Size range in µm or mm, fines fraction, wet bulk density in kg/m³, sticking and breakage tendency.
- Water and throughput
- Wet feed kg/h, inlet and target moisture in wt%, wet basis, plus the moisture test method.
- Temperature limits
- Allowed product temperature, feed temperature and known changes during drying.
- Air and collection
- Available heat, process air conditions, dust properties, filtration needs and room constraints.
RFQ workflow / Local demo
See How the RFQ Workflow Works
This is a local form demo. Use sample details only. Nothing is sent to a supplier or saved by this site.
Include the material, feed form, capacity with units, moisture in and out, temperature limit and available utilities. Write “Unknown” for values you do not have.
The demo checks required fields and text length. It does not select equipment or provide a price.
03 / Follow the air and solids
Working Principle
- Introduce wet particles. Feed the bed at a controlled rate.
- Distribute process air. Air passes through the plate beneath the particles.
- Fluidize and dry. Moving particles contact the air and release moisture.
- Control time in the bed. Balance feed, discharge and bed conditions.
- Discharge and collect. Remove dried solids and separate carried-over fines from the exhaust.
Inlet air temperature is not the product temperature. Record both during trials. Air conditions and particle behaviour determine whether the bed stays stable as moisture falls.
Material Suitability
| Material form | Review objective | Main question |
|---|---|---|
| Free-flowing wet granules | Stable drying and discharge | Will moisture changes cause sticking? |
| Wet crystals | Moisture removal with size control | Will movement create broken particles? |
| Fine powder | Assess fluidization and recovery | How much material leaves with the air? |
| Sticky or mixed-size feed | Confirm feasibility in a trial | Will particles clump or dry unevenly? |
Liquid-to-powder projects need a spray drying review. Solids needing batch treatment under reduced pressure may need vacuum drying.
Scope of Supply
Use a written list to define the equipment boundary and connection points.
Core scope to confirm
Bed body, air distribution, supply and exhaust fans, feed/discharge interfaces and controls. Confirm access for inspection.
Separately agreed
Air heating, dust collection, ductwork, cooling stages, noise treatment and installation. Specify each item in the quote.
Client site preparation
Utility connections, supporting structures, building openings and discharge routes, according to the agreed responsibility list.
Utilities and Site Conditions
Provide voltage, frequency, heat source and seasonal air conditions. State air volume at a defined temperature and pressure, so figures can be compared. Allow space for ducts, filter access and maintenance. Confirm exhaust discharge, dust handling and noise limits with the site team.
Options to Review
Vibration assistance, separate drying/cooling zones and different filter arrangements may be reviewed against the feed. Vibration does not guarantee that sticky material will work. Consider contact materials, cleaning access and controls together with the required product quality.
Testing, FAT and Acceptance
Test representative feed across the expected moisture and size range. Record bed pressure drop, fluidization stability, discharge moisture, particle size changes and fines carry-over. Observe deposits and how the equipment can be cleaned.
Agree sampling points, test duration and acceptance limits in advance. Factory acceptance testing (FAT) also checks the assembled equipment and controls. Site performance depends on actual feed and utilities; a workshop check alone cannot confirm it.
Fluid Bed Dryer Questions
Will my particles fluidize?
A name or average size cannot confirm this. Share the full distribution, density and moisture range, then test for stable movement and acceptable carry-over.
Why does particle size distribution matter?
Large particles and fines can behave differently in the same air stream. A trial checks uniform treatment, loss of fines and the final size distribution.
Can sticky feed be dried?
Only after a suitable process review. Particles may clump as moisture or temperature changes. Do not assume vibration or higher airflow will solve the problem.
Will granules break during drying?
Movement can affect fragile particles. Compare size measurements before and after testing, and agree an acceptable level of breakage.
Is the process batch or continuous?
This page uses continuous examples in kg/h. Batch configurations also exist. Compare kg/batch only with a stated cycle; do not treat it as hourly output.
Which air and moisture data should I provide?
Give air temperature, humidity and available utilities, plus inlet and final moisture with the measurement method. Include the allowed product temperature.
Start with Your Particle Data
Use sample values to try the local RFQ workflow.