Hollow Paddle Dryer
Drying Equipment
1. Product Overview
The hollow paddle dryer is a horizontal continuous drying equipment primarily using conduction heat transfer. It consists of a W-shaped trough, hollow paddle shafts, drive system, heating system, and shell. Widely used for: drying and cooling sludge, pastes, and powders. Features: thermal efficiency up to 85%+, small footprint, self-cleaning function of paddles, extremely wide applicability for moisture content.
2. Working Principle
Heating medium (steam/thermal oil) flows through the hollow paddle shafts and W-shaped jacketed trough; wedge-shaped hollow paddles rotate alternately, constantly stirring and pushing the material; material contacts the heated paddles and trough wall for heat transfer, and moisture vaporizes; the intermeshing of paddles provides a self-cleaning effect, preventing material from sticking to walls; exhaust gas exits from the top, and dry material is continuously discharged from the outlet.
3. System Classification
By Number of Paddle Shafts:
Twin-Shaft Paddle Dryer: Two hollow shafts intermesh alternately, good mixing and self-cleaning / General type, suitable for most sludges and pastes
Four-Shaft Paddle Dryer: Four hollow shafts, larger heat exchange area / High capacity, high moisture materials
Single-Shaft Paddle Dryer: Single hollow shaft, simple structure / Special conditions or small capacity |
4. Detailed Technical Parameters
4.1 Common Materials
| Material | Applicable Components/Media | Remarks |
|---|---|---|
| 304 Stainless Steel | Trough, paddle shafts | General chemicals, food, municipal sludge |
| 316L Stainless Steel | Strongly corrosive materials | Excellent corrosion resistance |
| Carbon Steel Q235B | Outer shell, frame | Interior requires anti-corrosion, low cost |
4.2 Typical Specification Table
| Heat Transfer Area (m²) | Trough Volume (m³) | Shaft Speed | Motor Power | Water Evaporation (kg/h) |
|---|---|---|---|---|
| 10～30 | 0.5～2.0 | 5～20 | 5.5～15 | 50～200 |
| 30～100 | 2.0～8.0 | 5～15 | 15～45 | 200～800 |
| 100～300 | 8.0～25.0 | 3～10 | 45～110 | 800～2500 |
4.3 Design Conditions & Performance
| Parameter | Specification |
|---|---|
| Heat Transfer Coefficient | 50～120W/m²·K (depending on material properties) |
| Heating Temperature | ≤200℃ (Steam/Thermal oil) |
| Evaporation Intensity | 8～20kg water/m²·h |
| Thermal Efficiency | ≥85% (Pure conduction) |
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 induced draft fan must have specified voltage and frequency. |
6. Core Component Selection
| Component | Brand/Material | Features & Applications |
|---|---|---|
| W-shaped Trough | Custom processing | Jacketed, 304/316L, U or W cross-section |
| Hollow Paddle Shafts | Custom processing | Wedge blades welded on hollow shaft, smooth flow channel |
| Rotary Joints | Custom matched | High temp/pressure resistant, anti-leakage, ensures media flow |
| Gear Reducer | National standard/Custom | Hardened surface gears, strong bearing capacity |
7. Typical Application Fields
Environmental Protection: Municipal sludge, electroplating sludge drying and volume reduction
Chemical Industry: Soda ash, starch, dyes drying
Food Industry: Yeast, distiller's grains, fishmeal drying
New Energy: Lithium battery cathode/anode materials drying |
8. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB 150-2011 | Pressure Vessels (jacket and hollow shafts applicable) |
| ISO 9001:2015 | Quality Management System |
| CE / EAC / GOST-R | Available upon request for international orders |
9. Custom Optional Configurations
| Option | Details |
|---|---|
| Shaft Number | Single / Twin / Four shafts |
| Heating Medium | Steam / Hot water / Thermal oil |
| Discharge Method | Overflow weir / Air-lock valve |
| Exhaust Treatment | Cyclone dust removal / Condensation recovery / Water scrubber |
10. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| Brand New | 12 months | Trough & jacket, paddle shaft system, drive system |
| Refurbished | 6 months | Trough & jacket, paddle shaft system, drive system |
| Idle | 3 months | Main functional components |
11. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Main Trough | Steel strap bundled nude or tarpaulin wrapped |
| Paddle Shafts / Reducer | Fully enclosed wooden cases, anti-deformation |
| Electrical / Rotary Joints | 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 viscosity; processing capacity and evaporation rate; heating source and temp limits; equipment status preference (new/refurbished/idle); delivery terms (FOB/CIF/DDP); destination port.