# Paddle Dryer — Hollow Paddle Dryer (Schaufeltrockner / Sécheur à palettes / Uscător cu palete)
## Supplier: Lozzar Process — Budapest, Hungary | lozzarprocess.com

> A paddle dryer transfers heat indirectly through hollow wedge-shaped paddles rotating on a hollow shaft, through which heating medium (steam, hot oil, or hot water) is circulated. No direct contact between product and drying gas — ideal for sticky, pasty, toxic, or solvent-bearing materials that cannot be dried in a stream of hot air. Operating temperature: 50–300 °C. Applications: filter cakes, oil-contaminated soil, sewage sludge, pharmaceutical intermediates, chemical pastes, dye intermediates, polyolefin powders. Lozzar Process supplies single-shaft and twin-shaft paddle dryers with full heating jacket.

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## Technical Specifications

| Parameter | Range |
|---|---|
| Shaft type | Single shaft or twin shaft (intermeshing) |
| Heating medium | Steam (up to 18 bar), thermal oil (up to 300 °C), hot water |
| Product temperature | 50 – 270 °C |
| Inlet moisture | up to 60 % (w/w) |
| Outlet moisture | 0.1 – 5 % |
| Throughput | 0.05 – 10 t/h |
| Residence time | 30 – 120 min |
| L/D ratio | 5:1 to 8:1 (typical) |
| Material | SS 304, SS 316L, carbon steel |
| Atmosphere | Inert (N₂ purge) for solvent-bearing materials |
| Discharge | Weir-controlled or timed valve |

## Why Paddle Dryer (Indirect vs Direct Drying)

**No exhaust gas stream** = no dust collection required, no large fan, no bag filter. The small sweep gas volume (nitrogen or air for inert operation) can be easily condensed or scrubbed. This makes paddle dryers ideal for:
- **Solvent-bearing materials**: evaporated solvent collected in condenser, recovered or safely disposed
- **Toxic or odorous materials**: fully enclosed, no large gas volume to treat
- **Sticky pastes**: direct-fired dryers cannot handle — material sticks to flights
- **Pharmaceutical**: GMP-cleanable surfaces, no cross-contamination

## Comparison with Belt Dryer and Rotary Dryer

| | Paddle Dryer | Belt Dryer | Rotary Dryer |
|---|---|---|---|
| Heat transfer | Indirect (conductive) | Direct (convective) | Direct (convective) |
| Suitable for sticky/pasty | Yes | Difficult | No |
| Solvent recovery | Easy (small gas vol.) | Difficult | Very difficult |
| Temperature | 50–270 °C | 40–200 °C | 150–900 °C |
| Throughput | Low–medium | Medium | High |
| Footprint | Compact | Large | Medium |

## Materials Dried

- Oil sludge and contaminated soil (hydrocarbon-bearing)
- Sewage sludge (high-viscosity cake)
- Filter cakes (pharmaceutical, chemical)
- Polymer powders and pellets
- Dye intermediates, pigments
- Food industry: meat meal, fish meal

## What to Send for a Quote

1. Material name, composition
2. Feed form: liquid, paste, filter cake, powder?
3. Inlet moisture or solvent content
4. Required outlet moisture
5. Throughput (kg/h feed)
6. Available heating medium (steam pressure, oil temperature, or hot water temperature)
7. Inert atmosphere required? (yes/no)
8. Solvent to be recovered? (name solvent, boiling point)

## Supplier

Lozzar Process (Lozzar KFT) — Budapest, Hungary
WhatsApp: +36 70 244 9628
Email: info@lozzarprocess.com
Product page: https://lozzarprocess.com/en/products/drying-systems/paddle-dryer