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Efficient Multi-Pass Belt Dryer for Optimal Pellet Quality

The fabric device distributes the materials evenly on the conveying mesh belt, and the motor drives the mesh belt to rotate, so that the materials circulate on each layer of the mesh belt, and finally output from the discharge port. The fan will send the heated hot air into the box, contact with the material, complete the heat transfer process, so as to achieve the purpose of drying the material.

RICHI Machinery Co., Ltd

Brand
RICHI

RICHI WorkShop

Model
DHG

belt dryer thumbnail
belt dryer

Feeding Device

01

It is composed of a feeding cylinder, a connecting rod and a motor reducer. The reducer is connected to the feeding cylinder through the connecting rod, and the reducer drives the feeding cylinder to move back and forth to achieve the purpose of uniform distribution of materials.

Material Conveying Part

02

The material moves on the mesh belt, through the transportation of four layers of mesh belt, and flows out from the discharge port. The motor adopts frequency conversion speed regulation, which can adjust the speed according to the material condition and control the drying time of the material.

Box Body

03

The box body is composed of three layers: the upper layer is equipped with steam radiator and radiator fan, the middle and lower layers are equipped with mesh belt conveying part, and each layer is divided into several small boxes. The overall modular design is conducive to production, transportation and installation.

Circulating Air System

04

It consists of steam heat exchanger and fan. The heat exchanger heats up the air, the fan sends the hot air into the box, and the hot air passes upward from the bottom through the sieve mesh to contact with the material and take away the moisture; the hot air continues upward and passes through the heat exchanger again.

belt dryer inside

Customizable

belt and conveyor

Adjustable

belt dryer motor

Stainless Steel

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richi belt dryer
  • Mixing Chamber
  • Double Paddle System
  • Roller Drive Mechanism
  • Discharge Gate
 
 

Parameter Table

Model DHG-400 DHG-500 DHG-1000 DHG-2000 QHG-500 QHG-1000 QHG-2000
Heating Method Electric Heating Electric Heating Electric Heating Electric Heating Steam Heating Steam Heating Steam Heating
Power (kw) 40+0.55*4+0.55 50+2.2*2+0.75 70+2.2*3+1.5 132+2.2*3+1.5 2.2*2+0.75 2.2*3+1.5 2.2*3+1.5
Mesh Belt Layers 5 5 5 5 5 5 5
Mesh Belt Width (m) 0.8 1.0 1.2 1.6 1.0 1.2 1.6
Drying Area (m²) 13 21 43 58 21 43 58

RICHI's Technological Innovations in Multi-pass Convection Belt Dryer

Technological innovation is essentially all about customer service. To make you feel the convenience of RICHI's products, technologies and solutions in the process of your production.

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belt dryer for aquafeed

Multi-Pass Drying Design

Multi-layer conveyor system for precise moisture control and stable drying quality. Maximum utilization of space, small footprint and high output.

belt drying machine

Advanced Airflow Optimization

Enhances heat transfer efficiency, reducing energy consumption. Prevents overheating or under-drying by ensuring even exposure to heat.

belt drying system

Intelligent Control System

Enables precise monitoring and adjustments for optimal drying conditions. Minimizes manual intervention, reducing labor costs.

richi belt drying machine

Energy Recovery Mechanism

Improves environmental sustainability by minimizing heat loss. Supports high-capacity drying while maintaining energy efficiency.

Your Seamless Buying Process: From Order to After-Sales Support

Discover our streamlined buying process that makes it simple and efficient for you to get a complete pellet production line. Every step of the way is customized for your convenience, from the initial schematic design and precise manufacturing process to secure payment options and on-site installation and commissioning. At the same time, our dedicated spare parts service ensures ongoing support and optimal machine performance, giving you peace of mind for years to come.

build your complete pellet production line
 
Solution Formulation

Solution Formulation

Equipment Manufacture

Equipment Manufacture

Secure Payment

Secure Payment

Spare Parts Service

Spare Parts Service

Complete Solutions For Pellet Production

Customize Your Pellet Plant Immediately
Raw Material Processing

Raw Material Processing

Essential for preparing and conditioning materials to ensure uniform quality before pelletizing.

Pelletizing

Pelletizing

The core process where prepared materials are compressed into dense, high-quality feed pellets.

Finished Pellet Processing

Finished Pellet Processing

Involves cooling, screening, and packaging to maintain pellet integrity and ready them for use or sale.

Auxiliary Equipment

Auxiliary Equipment

Supports the production line by enhancing material flow, reducing downtime, and maintaining operational efficiency.

Accessories

Accessories

Includes essential components like ring dies and rollers, crucial for consistent pellet production and machine performance.

Henan RICHI Machinery Co., Ltd

Global Case Study

Henan Richi Machinery Co., Ltd was founded in 1995. After nearly thirty years of development and expansion, RICHI Machinery has grown into a modern enterprise covering an area of 60,000 square meters and integrating independent research and development, production and sales.

The products involve feed pellet machinery and engineering, biomass pellet machinery and engineering, organic fertilizer machinery and engineering, conveying equipment and engineering, steel structure engineering, silo, automation control technology and engineering, etc., and each product series has passed ISO 9001 international quality management system certification and CE certification!

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Complete Solutions For Pellet Production

Explore RICHI’s Complete Solutions For Pellet Production

What kind of pellet production line do you want to establish?

How many tons per hour about this line you want to build?

Where is this pellet production line going to be built?

When do you plan to start the operation?

Multi-Pass Convection Mesh Belt Dryer: Your Questions Answered

A multi-pass convection belt dryer is used to efficiently dry materials such as pellets, granules, or powders by exposing them to controlled heat and airflow across multiple conveyor belt layers. This type of dryer is commonly utilized in industries like animal feed production, aquaculture, biomass energy, and food processing.

The dryer ensures uniform moisture reduction by allowing materials to pass through several drying zones, each with adjustable temperature and airflow settings. This design is ideal for large-scale operations, as it maximizes drying efficiency while minimizing floor space requirements. The multi-pass approach also helps achieve consistent product quality, making it suitable for materials that require precise moisture control for durability and performance.

The multi-pass convection belt dryer works by drying materials as they move across multiple layers of conveyor belts within a heated chamber. The process is designed for efficient and uniform drying of materials like pellets, powders, or granules. Here's how it works:

  1. Material Feeding
    • Raw materials are evenly loaded onto the first conveyor belt using an automated feeder. The distribution system ensures consistent layer thickness for uniform drying.
  2. Convection Heating
    • Heated air is circulated throughout the drying chamber by high-performance fans or blowers. This air passes over and sometimes through the materials, transferring heat via convection to remove moisture.
  3. Multi-Pass Design
    • The materials move through multiple layers of belts. Each pass exposes them to controlled heat and airflow, ensuring gradual and uniform moisture removal. The temperature and airflow can be adjusted for each layer to optimize drying efficiency.
  4. Moisture Evaporation
    • As the heated air interacts with the materials, moisture is evaporated and carried away by an exhaust system. This process prevents over-drying or uneven drying.
  5. Discharge
    • Once the materials pass through all the belt layers, they are discharged via an outlet conveyor or hopper, ready for cooling or further processing.

The multi-pass convection belt dryer is highly versatile and can process a wide range of materials across various industries. Common materials include:

  1. Animal Feed and Aquaculture Feed Pellets
    • Used for livestock, poultry, and aquaculture feed production, ensuring the pellets reach the optimal moisture content for durability and storage.
  2. Biomass Pellets
    • Includes wood pellets, straw pellets, and other biomass materials used for energy production.
  3. Industrial Powders and Granules
    • Ideal for drying chemical powders, fertilizers, or mineral granules to achieve consistent moisture levels.
  4. Food Products
    • Suitable for drying food items like cereals, grains, or snacks in the food processing industry.
  5. Pharmaceutical Products
    • Used for controlled drying of granules or powders in pharmaceutical manufacturing.

The multi-pass design in a convection belt dryer offers several key advantages, particularly in terms of efficiency, space utilization, and product quality:

  1. Enhanced Drying Efficiency: By allowing materials to pass through multiple layers of conveyor belts, the dryer ensures that each particle is exposed to consistent heat and airflow for a longer period. This design optimizes moisture removal and reduces drying time.
  2. Space-Saving: The multi-pass structure stacks the conveyor belts vertically, maximizing drying capacity within a compact footprint. This is particularly beneficial for facilities with limited floor space.
  3. Improved Product Quality: The gradual and uniform exposure to controlled heat prevents over-drying or heat damage, preserving the material's structural integrity and ensuring consistent quality.

The typical drying time in a multi-pass belt dryer varies depending on the material type, initial moisture content, desired final moisture level, and the dryer settings. Generally, drying times range from 15 to 60 minutes.

Yes, the drying temperature can be precisely controlled to suit different materials, ensuring optimal drying without damaging the product.

Yes, modern multi-pass belt dryers are equipped with heat recovery systems and optimized airflow designs to minimize energy consumption.

The material loading and unloading process in a multi-pass convection belt dryer is designed to ensure smooth, continuous, and efficient operation.

  1. Material Loading
    • Materials are typically loaded onto the first conveyor belt via an automated feeder system, such as a hopper or a dosing device.
    • The feeder ensures a uniform distribution of materials across the belt, preventing clumping or uneven drying.
    • Some dryers use vibrating feeders or spreaders to further distribute the material evenly before it enters the drying chamber.
  2. Material Unloading
    • At the end of the drying process, the materials are discharged from the final conveyor belt through an outlet chute or a discharge port.
    • In automated systems, the dried material is transferred directly to the next stage, such as cooling, sieving, or packaging, using conveyors or hoppers.
    • For batch operations, the discharge system may allow for manual collection or temporary storage in bins.

Yes, its design optimizes power usage while maintaining high performance.

  1. Cleaning the Belts
    • Why: Dust, residue, or material buildup on the conveyor belts can reduce airflow and drying efficiency.
    • Frequency: After each production cycle or as needed based on the material being processed.
  2. Inspecting the Heating System
    • Why: Ensures the heaters or heat exchangers are functioning correctly and maintaining the desired temperature.
    • Frequency: Monthly or after extended use.
  3. Checking Fans and Blowers
    • Why: Proper airflow is critical for uniform drying. Worn or damaged fans can reduce efficiency.
    • Frequency: Weekly inspection and cleaning.
  4. Ensuring Proper Belt Tension
    • Why: Loose or misaligned belts can cause uneven material flow or damage to the dryer.
    • Frequency: Regularly, especially after prolonged operation.
  5. Inspecting the Frame and Housing
    • Why: Prevents structural wear and ensures the machine operates safely. Look for signs of corrosion or damage.
    • Frequency: Quarterly or as part of routine maintenance schedules.
  6. Checking for Blockages in Air Ducts
    • Why: Dust or debris can clog the ducts, reducing airflow and increasing energy consumption.
    • Frequency: Periodically, depending on the dustiness of the materials being processed.
  7. Lubricating Moving Parts
    • Why: Reduces friction and wear on components like bearings, rollers, and chains.
    • Frequency: As per manufacturer guidelines, typically every 2-4 weeks.
  8. Inspecting Electrical Systems
    • Why: Ensures all controls, sensors, and wiring are in proper working order to avoid operational disruptions.
    • Frequency: Monthly or during scheduled maintenance.
  9. Replacing Worn Components
    • Why: Prevents breakdowns and ensures the machine operates at peak performance. Common replacements include belts, bearings, and fan blades.
    • Frequency: As needed, based on wear and tear.

Yes, the multi-pass convection belt dryer is designed for seamless integration with other equipment like pellet mills, coolers, and packaging systems.

If you need further information, please contact us

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