Vacuum Belt Dryer
Drying Equipment
1. Product Overview
The vacuum belt dryer continuously feeds and discharges material under vacuum, performing spreading, drying, cooling and crushing/granulating on a conveyor belt. It consists of the main vacuum chamber, a dosing (spreading) system, heating and cooling systems, a belt conveying system, a crushing system and a vacuum condensation system. It is widely used for TCM extracts, food extracts, biological products and other heat-sensitive pastes. Key features: continuous production; fast low-temperature drying; excellent product solubility; preservation of the material's bioactivity; and full recovery of organic solvents.
2. Working Principle
Liquid or pasty feed is spread evenly onto the circulating conveyor belt by the dosing unit. Inside the vacuum chamber the belt travels forward through heating zones (radiant heat from plates heated by thermal oil, hot water or steam) and a cooling zone. The material forms a porous, crisp dry cake on the belt, which is broken up by chopper blades at the discharge end and continuously discharged through a double rotary air-lock valve.
3. System Classification
By belt configuration:
Single-layer vacuum belt dryer: material is dried in one pass on a single belt / general purpose, easy to clean
Multi-layer vacuum belt dryer: material cascades onto lower belts, extending the residence time / high capacity where floor space is limited
Spray-type vacuum belt dryer: the feed liquid is sprayed onto the belt through nozzles / very low-viscosity liquids and ultra-thin-film drying
4. Detailed Technical Parameters
4.1 Common Materials
| Material | Typical Parts | Remarks |
|---|---|---|
| 304 Stainless Steel | Shell, heating plates, dosing unit, chopper blades | Corrosion-resistant, complies with food/GMP standards |
| 316L Stainless Steel | Parts in contact with strongly corrosive materials | Outstanding corrosion resistance |
| PTFE / special stainless steel | Conveyor belt | Anti-adhesive; permeable or impermeable types available |
4.2 Typical Specifications
| Belt Width | Drying Section Length | Water Evaporation (kg/h) | Heating Temperature (℃) | Installed Power |
|---|---|---|---|---|
| 300～600 | 3～6 | 10～30 | 50～150 | 10～20 |
| 600～1200 | 6～12 | 30～100 | 50～150 | 20～45 |
| 1200～2000 | 12～20 | 100～300 | 50～150 | 45～90 |
4.3 Design Conditions & Performance
| Parameter | Specification |
|---|---|
| Operating Vacuum | -0.096～-0.099MPa |
| Drying Time | 20～90 min (adjustable belt speed) |
| Heating Source Temperature | 50℃～180℃ (hot water/thermal oil) |
| Product Yield | ≥99% (fully enclosed recovery) |
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: Please specify voltage and frequency for the belt drive, vacuum pump and chopper motors. |
6. Core Component Selection
| Component | Brand/Material | Features & Applications |
|---|---|---|
| Conveyor Belt | Custom-built | PTFE mesh / stainless-steel wire mesh / special fabric; anti-stick and permeable |
| Dosing (Spreading) Unit | Matched set | Roller, doctor blade or nozzle, for feeds of different viscosity |
| Heating/Cooling Plates | Custom-built | 304/316L jacketed plates for uniform radiant heat transfer |
| Double Air-lock Discharge Valve | Matched set | Alternating double flap valves maintain vacuum for continuous discharge |
7. Typical Application Fields
Pharmaceutical industry: drying of extracts for TCM formula granules
Food industry: drying of instant tea powders, juice powders and protein powders
Chemical industry: drying of fine-chemical slurries and pigments
Biotech industry: drying of enzyme preparations and biomass
8. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB 150-2011 | Pressure vessels (applies to the vacuum chamber and jacket) |
| ISO 9001:2015 | Quality management system |
| GMP | Good Manufacturing Practice |
| CE / EAC / GOST-R | Available on request for international orders |
9. Custom Optional Configurations
| Option | Details |
|---|---|
| Spreading Method | Roller coating / doctor-blade dosing / spray film |
| Heating Medium | Hot water / thermal oil / steam |
| Belt Type | PTFE mesh / stainless-steel mesh / special solid belt |
| Discharge Method | Crushing and granulating / direct collection |
10. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| Brand New | 12 months | Main shell, heating plates, belt conveying system, sealing system |
| Refurbished | 6 months | Main shell, heating plates, belt conveying system, sealing system |
| Idle | 3 months | Main functional components |
11. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Main Shell | Wrapped in tarpaulin, mounted on a wooden skid |
| Conveyor Belt / Dosing Unit | Fully enclosed wooden cases, protected against crushing and deformation |
| Electrical / Pumps | Waterproof-sealed packing, packed in wooden cases |
| Container or break-bulk shipping. On-site installation and commissioning guidance available. |
12. Information Required for Inquiry
12. Information Required for Quotation Material name, solid content and viscosity; processing capacity or evaporation rate; feed temperature and drying temperature limits; solvent type (water/organic); product requirements (powder/granules); preferred equipment condition (new/refurbished/idle); delivery terms (FOB/CIF/DDP); destination port.