Disc Dryer
Drying Equipment
1. Product Overview
The disc dryer is a vertical continuous drying equipment using hollow heating discs for conduction heat transfer. It consists of a cylindrical shell, hollow heating discs, rake arms, drive mechanism, and body. Widely used for: powders and granules in chemicals, pharmaceuticals, food, and pesticides. Features: high thermal efficiency, low energy consumption, small footprint, single-direction material flow without back-mixing, vacuum operation for solvent recovery.
2. Working Principle
Heating medium flows into each layer of hollow discs; wet material is fed from the top and pushed by rotating rake blades, moving spirally across the disc surface inward or outward; material falls to the next disc layer, passing through all layers sequentially; moisture vaporizes upon heating and is exhausted from the top outlet.
3. System Classification
By Operating Environment:
Atmospheric Disc Dryer: Shell operates at atmospheric pressure, exhaust drawn by fan / General chemical powders, non-oxidizable materials
Vacuum Disc Dryer: Shell vacuumized, solvent condensable and recoverable / Heat-sensitive, easily oxidizable, solvent-recovery materials
Closed Disc Dryer: Slight negative pressure or inert gas protection / Flammable, explosive, toxic powders |
4. Detailed Technical Parameters
4.1 Common Materials
| Material | Applicable Components | Remarks |
|---|---|---|
| 304 Stainless Steel | Heating discs, rakes, shell | General food/chemical grade |
| 316L Stainless Steel | Parts contacting corrosive materials | Preferred for pharmaceuticals |
| Carbon Steel Q235B | Outer shell, supports | Low cost, non-corrosive environments only |
4.2 Typical Specification Table
| Heating Area (m²) | Disc Layers | Drying Capacity (kg/h) | Rake Shaft Speed | Motor Power |
|---|---|---|---|---|
| 5～20 | 6～12 | 50～300 | 5～15 | 2.2～5.5 |
| 20～80 | 12～24 | 300～1500 | 5～12 | 5.5～15 |
| 80～200 | 24～40 | 1500～5000 | 3～8 | 15～37 |
4.3 Design Conditions & Performance
| Parameter | Specification |
|---|---|
| Heat Transfer Coefficient | 30～80W/m²·K (depending on material and scaling) |
| Heating Temperature | ≤150℃ (Steam/Hot water) |
| Evaporation Intensity | 5～15kg water/m²·h |
| Material Residence Time | 0.5～2 hours (speed adjustable) |
5. Electrical Parameters
| Region | Voltage | Frequency |
|---|---|---|
| China/Russia/Central Asia | 380V | 50Hz |
| Middle East/Southeast Asia/Africa | 400V / 415V | 50Hz |
| South Korea | 380V | 60Hz |
| Americas (if required) | 440V / 480V | 60Hz |
| Note: Main shaft drive motor and vacuum pump must have specified voltage and frequency. |
6. Core Component Selection
| Component | Brand/Material | Features & Applications |
|---|---|---|
| Hollow Heating Discs | Custom processing | 304/316L, internal flow channel design, uniform heating |
| Rake Arms & Blades | Custom processing | Wear-resistant, adjustable angle to control flow |
| Main Shaft Seal | Custom matched | Packing/Mechanical seal, suits vacuum/atmospheric |
| Reducer | National standard/Helical gear | Smooth transmission, high torque capacity |
7. Typical Application Fields
Chemical Industry: Soda ash, catalysts, resin drying
Pharmaceutical Industry: Intermediates, API drying
Food Industry: Starch, flour, solid beverage drying
Environmental Protection: Sludge, carbide slag drying |
8. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB 150-2011 | Pressure Vessels (hollow discs and vacuum shell applicable) |
| ISO 9001:2015 | Quality Management System |
| CE / EAC / GOST-R | Available upon request for international orders |
9. Custom Optional Configurations
| Option | Details |
|---|---|
| Operating Environment | Atmospheric / Vacuum / Closed inert gas |
| Heating Medium | Steam / Hot water / Thermal oil |
| Rake Blade Type | Flat / Inclined / Spring-floating (anti-scaling) |
| Discharge Method | Bottom continuous / Air-lock valve |
10. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| Brand New | 12 months | Shell, heating disc system, main shaft and drive system |
| Refurbished | 6 months | Shell, heating disc system, main shaft and drive system |
| Idle | 3 months | Main functional components |
11. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Main Shell | Steel strap bundled nude or tarpaulin wrapped |
| Heating Discs / Rake Arms | Fully enclosed wooden cases, anti-deformation |
| Electrical / Reducer | Waterproof sealed packaging in wooden cases |
| Container or bulk shipping. On-site installation and commissioning guidance available. |
12. Information Required for Inquiry
12. Information Required for Inquiry Material name, initial/final moisture content; material form and flowability; processing capacity; heating source and temp limits; need for solvent recovery; equipment status preference (new/refurbished/idle); delivery terms (FOB/CIF/DDP); destination port.