stainless steel rotary dryer
The Best Choices for Your Project
- Customization Service：The maximum customizable diameter is 3.5 meters
- Solution：Provide solutions for your problems
- Dryer length: 8 meters to 50 meters.
stainless steel rotary dryer
A Stainless Steel Rotary Dryer is an industrial drying machine designed to reduce the moisture content of various bulk materials through a continuous, efficient process. As the name suggests, it is primarily constructed from stainless steel, which offers superior corrosion resistance, hygiene, and durability compared to carbon steel dryers. It consists of a large, rotating cylindrical drum that is slightly inclined, through which the wet material and hot gases pass to facilitate drying.
These dryers are essential in industries where product purity, contamination prevention, and equipment longevity are critical, such as food, pharmaceutical, and chemical processing.
The working principle of a stainless steel rotary dryer is based on direct or indirect heat transfer and the tumbling action of the rotating drum.
Feeding: The wet material is continuously fed into the elevated end of the rotating drum.
Drum Rotation & Tumbling: As the drum rotates, internal fins or lifters pick up the material and shower it down through the drum’s interior. This tumbling action exposes a large surface area of the material to the heat source.
Heat Transfer: A hot gas stream (heated by a burner, steam, or other sources) flows through the drum. In a direct-contact dryer, the hot gases directly contact the material. In an indirect-contact dryer, the material is heated through the drum’s shell, preventing direct contact with combustion gases.
Moisture Evaporation: The heat from the gases causes the moisture within the material to evaporate.
Discharge: The dried material exits at the lower end of the drum. The exhaust gases, now laden with moisture, are typically treated by a dust collection system (like a cyclone or baghouse) before being released.
We offer several series of stainless steel rotary dryers, each engineered for specific application needs:
SSRD-Food Series: Designed for food-grade and pharmaceutical applications, featuring polished finishes and advanced hygiene controls.
SSRD-Industrial Series: Built for robust performance with corrosive or abrasive materials like chemicals and minerals.
SSRD-Biomass Series: Optimized for high-volume, low-density organic materials like sawdust, manure, and sludge.
Detailed Technical Specifications by Model
1. SSRD-Food Series (Food & Pharmaceutical Grade)
| Model | Drum Diameter (m/ft) | Drum Length (m/ft) | Rotation Speed (rpm) | Motor Power (kW/hp) | Capacity* (kg/h) | Capacity* (lbs/h) | Inlet Air Temp. Max (°C/°F) | Shell Thickness (mm) |
|---|---|---|---|---|---|---|---|---|
| SSRD-F100 | 1.0 m / 3.3 ft | 5 m / 16.4 ft | 4-8 | 5.5 kW / 7.4 hp | 500 – 1,000 | 1,100 – 2,200 | 250°C / 482°F | 6 mm |
| SSRD-F150 | 1.5 m / 4.9 ft | 8 m / 26.2 ft | 3-7 | 11 kW / 14.8 hp | 1,200 – 2,500 | 2,650 – 5,500 | 250°C / 482°F | 8 mm |
| SSRD-F220 | 2.2 m / 7.2 ft | 12 m / 39.4 ft | 3-6 | 22 kW / 29.5 hp | 3,000 – 5,500 | 6,600 – 12,100 | 250°C / 482°F | 10 mm |
| SSRD-F280 | 2.8 m / 9.2 ft | 16 m / 52.5 ft | 2-5 | 37 kW / 49.6 hp | 6,000 – 10,000 | 13,200 – 22,000 | 250°C / 482°F | 12 mm |
2. SSRD-Industrial Series (Chemicals, Minerals, Abrasive Materials)
| Model | Drum Diameter (m/ft) | Drum Length (m/ft) | Rotation Speed (rpm) | Motor Power (kW/hp) | Capacity* (kg/h) | Capacity* (lbs/h) | Inlet Air Temp. Max (°C/°F) | Shell Thickness (mm) |
|---|---|---|---|---|---|---|---|---|
| SSRD-I120 | 1.2 m / 3.9 ft | 6 m / 19.7 ft | 4-8 | 7.5 kW / 10.1 hp | 1,000 – 2,000 | 2,200 – 4,400 | 400°C / 752°F | 8 mm |
| SSRD-I200 | 2.0 m / 6.6 ft | 10 m / 32.8 ft | 3-6 | 18.5 kW / 24.8 hp | 2,500 – 5,000 | 5,500 – 11,000 | 400°C / 752°F | 12 mm |
| SSRD-I300 | 3.0 m / 9.8 ft | 15 m / 49.2 ft | 2-5 | 45 kW / 60.3 hp | 7,000 – 12,000 | 15,400 – 26,400 | 400°C / 752°F | 16 mm |
| SSRD-I380 | 3.8 m / 12.5 ft | 20 m / 65.6 ft | 2-4 | 75 kW / 100.6 hp | 12,000 – 20,000 | 26,400 – 44,000 | 400°C / 752°F | 20 mm |
3. SSRD-Biomass Series (Sawdust, Manure, Sludge, Compost)
| Model | Drum Diameter (m/ft) | Drum Length (m/ft) | Rotation Speed (rpm) | Motor Power (kW/hp) | Capacity* (kg/h) | Capacity* (lbs/h) | Inlet Air Temp. Max (°C/°F) | Shell Thickness (mm) |
|---|---|---|---|---|---|---|---|---|
| SSRD-B180 | 1.8 m / 5.9 ft | 10 m / 32.8 ft | 3-7 | 15 kW / 20.1 hp | 1,500 – 3,000** | 3,300 – 6,600** | 350°C / 662°F | 10 mm |
| SSRD-B250 | 2.5 m / 8.2 ft | 14 m / 45.9 ft | 2-5 | 30 kW / 40.2 hp | 4,000 – 7,000** | 8,800 – 15,400** | 350°C / 662°F | 12 mm |
| SSRD-B350 | 3.5 m / 11.5 ft | 18 m / 59.0 ft | 2-5 | 55 kW / 73.8 hp | 8,000 – 14,000** | 17,600 – 30,800** | 350°C / 662°F | 14 mm |
* Capacity is highly dependent on initial and final moisture content, material density, and other factors. The values shown are estimated ranges for a typical application.
** Biomass capacity is highly variable due to low bulk density. Values are for wet input material.
Comprehensive List of Additional Parameters & Specifications
A. Stainless Steel Material Specifications
Grades Available: 304, 304L, 316, 316L, 310S, 904L, Duplex Stainless Steel.
Surface Finish: 2B Mill Finish, #4 Brushed Finish, Mirror Polish (up to #8), Electropolish.
Internals: Lifting flights and lifters are also constructed from stainless steel.
B. Drive & Rotation System
Drive Type: Gear and Pinion with AC Motor, Direct Drive with Hydraulic Motor.
Motor Type: Standard AC Motor, Variable Frequency Drive (VFD) for precise speed control, Explosion-Proof Motor.
Support System: Trunnion Rollers with hardened steel or rubber tires, Thrust Rollers.
C. Thermal & Air Flow System
Heat Source: Natural Gas Burner, Diesel Burner, Biomass Burner, Steam Heater, Thermic Fluid Heater, Electric Heater.
Burner Capacity: Ranges from 500,000 BTU/hr to 15,000,000 BTU/hr depending on model.
Air Flow Fan: Induced Draft (ID) Fan or Forced Draft (FD) Fan.
Fan Power: From 2.2 kW to 30 kW, depending on system size and air resistance.
D. Dust Collection & Emissions Control
Standard Cyclone: Constructed from Stainless Steel or Carbon Steel.
Baghouse Filter: For fine powder recovery, with pulse-jet cleaning.
Wet Scrubber: For corrosive or sticky exhaust gases.
Material of Construction: Matching the dryer (e.g., SS304/316 for corrosion resistance).
E. Instrumentation & Control (Optional)
Control Panel: PLC with Touchscreen HMI.
Monitoring Sensors: Inlet/Outlet Temperature, Drum Rotation Speed, Bearing Temperature, Flame Sensor.
Automation: Automated start/stop sequence, temperature control loops, safety interlocks.
F. Customization Options
Lifter Design: Standard, Sectional, Open-Spiral Closed-Spiral.
Sealing System: Labyrinth Seals, Pneumatic Seals, Felt Seals at feed and discharge ends.
Insulation: Ceramic Fiber Blanket, Rock Wool with stainless steel cladding to reduce heat loss.
Inclination Angle: Adjustable from 1° to 5° to control material retention time.
What Materials Can a Stainless Steel Rotary Dryer Dry?
Stainless steel rotary dryers are highly versatile and can handle a wide range of materials, particularly those that are abrasive, corrosive, or require high purity.
Common materials include:
Food Products: Soybean meal, corn gluten meal, distiller’s grains (DDGS), wheat bran, sugar, salt, spices.
Chemicals: Sodium sulfate, PVC resin, fertilizers, various salts, pigments, cellulose.
Mineral & Mining Sands: Silica sand, clay, gypsum, ores, limestone.
Biomass & Organic Waste: Sawdust, wood chips, manure, sludge, compost.
Which Materials Are Best Suited for a Stainless Steel Rotary Dryer?
While versatile, stainless steel dryers are especially suited for:
Corrosive Materials: Salts, certain fertilizers, and chemicals that would rapidly degrade carbon steel.
Hygiene-Sensitive Materials: Food, pharmaceutical ingredients, and animal feed where contamination from rust or scale is unacceptable.
Abrasive Materials: Minerals and ores where the stainless steel’s hardness provides better wear resistance.
Materials Requiring High Purity: Products where color, taste, or chemical composition must remain unaltered by equipment corrosion.
Energy Consumption of a Stainless Steel Rotary Dryer
The energy consumption of a rotary dryer depends on several factors:
Initial Moisture Content: Higher moisture requires more energy to evaporate.
Final Desired Moisture: Achieving a very low moisture level consumes more energy.
Material Characteristics: Density, particle size, and heat sensitivity affect drying efficiency.
Dryer Design: Modern dryers with heat recovery systems (like pre-heating incoming air with exhaust) are significantly more efficient.
While specific numbers require a detailed analysis, modern stainless steel rotary dryers are designed for optimal thermal efficiency to minimize operational costs. Insulation and controlled air flow are key to reducing energy waste.
Key Benefits of a Stainless Steel Rotary Dryer
Corrosion Resistance: Excellent for processing wet, salty, or acidic materials without rusting, ensuring a longer service life.
Hygienic & Easy to Clean: The non-porous surface of stainless steel prevents bacterial growth and allows for easy cleaning, meeting strict sanitary standards (e.g., FDA, USDA).
Product Purity: Eliminates the risk of iron oxide contamination, crucial for food, pharmaceutical, and high-purity chemical products.
Durability & Longevity: Withstands harsh operating environments and abrasive materials, reducing long-term maintenance and replacement costs.
High Efficiency: Continuous operation and the tumbling action provide uniform drying and high throughput.
Customizability: Can be tailored to specific material requirements and production goals.
We Customize Stainless Steel Rotary Dryers for Your Needs
we understand that no two materials are the same. A one-size-fits-all approach does not work for industrial drying. That’s why we specialize in designing and manufacturing custom stainless steel rotary dryers tailored to your specific raw material characteristics and production objectives.
Our customization process includes:
Material Analysis: We test your material to understand its moisture content, particle size, abrasiveness, and thermal sensitivity.
Sizing & Capacity: We design the drum size, rotation speed, and inclination to meet your desired throughput.
Heat Source Integration: We configure the dryer to work efficiently with your available heat source (gas, oil, steam, electric).
Special Features: We can include custom lifters, flight designs, insulation, and air flow systems to optimize performance for your unique application.
Contact us today for a free consultation! Let our experts help you design the perfect stainless steel rotary dryer solution to improve your product quality and operational efficiency.