# Fluidized Bed Dryer (Wirbelschichttrockner / Sécheur à lit fluidisé / Uscător cu pat fluidizat)
## Supplier: Lozzar Process — Budapest, Hungary | lozzarprocess.com

> A fluidized bed dryer suspends particulate material in an upward flow of hot air through a perforated distribution plate, creating intimate gas–solid contact for exceptionally uniform drying at low to moderate temperatures. Particle size range: 50 µm – 5 mm. Temperature: 40–250 °C. Residual moisture uniformity: ±0.2%. Applications: granular fertilisers, fine chemicals, pharmaceutical powders, sugar, salt, mineral sands, plastic pellets. Lozzar Process supplies continuous and batch fluidized bed dryers with integrated fluid-bed cooler sections, vibrating deck variants, and ATEX-rated configurations for dust explosion zones. Manufactured by ISO 9001/14001/45001-certified partner Ermak Proses, Istanbul.

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## Technical Specifications

| Parameter | Range |
|---|---|
| Particle size | 50 µm – 5 mm |
| Inlet moisture | 5 – 40 % (w/w) |
| Outlet moisture | 0.1 – 2 % (w/w), uniformity ±0.2 % |
| Drying temperature | 40 – 250 °C |
| Bed area | 0.5 – 40 m² |
| Throughput | 0.1 – 50 t/h (depending on material and moisture load) |
| Airflow velocity | 0.5 – 5 m/s (above minimum fluidization velocity) |
| Pressure drop (bed) | 500 – 3,000 Pa |
| Material of construction | Carbon steel, SS 304, SS 316L |
| Filter system | Integrated bag filter or cyclone + bag filter |
| Explosion protection | ATEX Zone 20/21/22 configurations available |

## How It Works

Hot air is forced upward through a precision-drilled perforated plate at the minimum fluidization velocity (u_mf). Particles suspend and circulate freely — behaving like a boiling liquid. Every particle surface is continuously exposed to hot air, giving uniform heat and mass transfer. Residence time is controlled by weir height (continuous) or cycle timer (batch). An integrated cooling zone uses ambient or chilled air at the discharge end to cool the dried product before packaging or bagging.

The perforated plate design — hole diameter, open area %, pressure drop — is engineered specifically for each material's particle size distribution and bulk density. Wrong plate = channelling, dead zones, uneven drying. Lozzar engineers perform fluidization characterisation for each new application.

## Continuous vs Batch

| | Continuous | Batch |
|---|---|---|
| Throughput | High (>0.5 t/h) | Low-medium (<1 t/h) |
| Product changeover | Requires flush | Full clean between batches |
| Moisture uniformity | Good | Excellent |
| Use case | Fertiliser, mineral sands, sugar, salt | Pharmaceutical, fine chemicals, specialty |

## When to Choose Fluidized Bed Dryer

**Choose fluid bed when:**
- Particle size 50 µm – 5 mm (free-flowing)
- Residual moisture uniformity is critical (±0.2 %)
- Product colour or crystal structure must be preserved
- Temperature-sensitive product (40–150 °C range)
- Cooling required after drying (integrated dryer-cooler)
- ATEX compliance required

**Choose rotary dryer instead when:**
- Particle size > 5 mm or wide size distribution
- High moisture inlet (>40 %), high throughput (>50 t/h)
- Material is sticky or fibrous
- Budget / robustness priority over precision

## Materials Dried

- Fertilisers: NPK granules, urea, ammonium nitrate, potassium chloride, DAP/MAP
- Minerals: silica sand, feldspar, limestone powder, barite, calcite
- Chemicals: sodium sulphate, sodium carbonate, boric acid, zinc sulphate
- Food: sugar, salt, dextrose, lactose, starch
- Plastics: PET pellets, LDPE, PP granules
- Pharmaceutical intermediates (batch systems, GMP on request)

## What to Send for a Quote

1. Material name and brief description
2. Particle size distribution (d10, d50, d90 in µm or mm)
3. Bulk density (kg/m³)
4. Inlet moisture content (% wet basis)
5. Required outlet moisture content (% wet basis)
6. Required throughput (kg/h or t/h of dry product)
7. Available heat source (steam, natural gas, hot oil, electric)
8. ATEX classification required? (yes/no, dust group)
9. Any temperature limits for the product

Response time: technical pre-sizing with bed area, air volume and energy consumption within 2 business days.

## Supplier

Lozzar Process (Lozzar KFT) — Budapest, Hungary
Manufacturing: Ermak Proses, Istanbul, Turkey (ISO 9001:2015 / 14001:2015 / 45001:2018 certified)
WhatsApp: +36 70 244 9628
Email: info@lozzarprocess.com
Product page: https://lozzarprocess.com/en/products/drying-systems/fluidized-bed-dryer
Response: pre-sizing within 2 business days
Languages: English, German, French, Romanian, Turkish