Wood Pellet Production Line

Solutions for processing logs, waste wood, wood chips, sawdust, into fuel pellets

Wood Pellet Production Line

Customized Wood Pellet Production Line

Wood pellet production lines are production systems that process logs, waste wood, waste boards, wood chips, sawdust and other log materials into high calorific value environmentally friendly fuels. Production capacity can be tailored to customer requirements (10,000-100,000 tonnes/year) and the common sizes of finished pellets are 6 mm, 8 mm and 10 mm.

Annual Production Capacity of Wood Pellet Production Line

Annual production capacity

Annual output of 10,000 tons, suitable for start-ups or small processing plants, with relatively low investment costs, can meet local market demand within a certain range, such as small heating enterprises, rural biomass fuel market, etc.

Annual output of 30,000 tons, suitable for enterprises with a certain market base and stable customer base, can stably supply regional markets, such as medium-sized industrial boiler fuel demand, regional biomass power plants, etc.

With an annual output of more than 50,000 tons, it is tailor-made for large energy companies and biomass fuel groups. It has a high level of automation and intelligence, and can efficiently meet large-scale market demands such as urban centralized heating and energy supply for large industrial enterprises.

Equipment Configuration of Wood Pellet Production Line

Equipment Configuration

Raw material receiving and pre-processing area

  • Raw material storage site: According to the production scale, a sufficient area of ​​raw material storage site is planned, the ground is hardened, and rain and moisture-proof facilities are equipped to ensure that the quality of wood raw materials is not affected by the external environment.
  • Belt conveyor: Use high-strength, corrosion-resistant belts, the bandwidth is selected between 500-1000 mm according to the conveying volume, and the length is determined according to the site layout to ensure the continuity and stability of raw material supply.
  • Bucket elevator: Suitable for vertical lifting of materials, the lifting height can reach 10-30 meters, and the bucket capacity is selected between 0.5-2 cubic meters according to production capacity.
  • Industrial wood chipper: for larger sized wood raw materials, such as logs, planks, large branches, etc., a wood chipper can be used for coarse crushing.
  • Hammer mill: After coarse crushing, the material enters the hammer mill to crush the raw materials into small and uniform particles, and the finished product particle size can be controlled between 3-8 mm.
  • Vibrating screen (optional): Use a vibrating screen to screen the crushed raw materials to remove oversized particles and impurities, ensuring that the raw materials entering the granulation stage have uniform particle size and high purity.

Drying area

  • Rotary dryer: It is composed of a cylinder, a lifting plate, a transmission device, a heating device, etc. The cylinder is made of high-quality carbon steel or stainless steel, installed at an angle, and a lifting plate is installed inside, which allows the material to fully contact with hot air during the rotation of the cylinder to achieve rapid drying.

  • Airflow dryer: It uses high-speed hot air flow to make the material fully contact with hot air in a fluidized state to achieve instant drying. It has the characteristics of fast drying speed, high efficiency, and strong adaptability to materials.

Pelletizing Area

  • Ring die pelletizer: It is one of the core equipment for wood pellet production, consisting of a ring die, a pressure roller, a transmission device, a feeding device, a tempering device, etc. The ring die is made of high-quality alloy steel and has a high-precision die hole. The hole diameter is selected between 6 and 12 mm according to the product specifications, and wood pellets of different diameters can be produced.
  • Flat die pelletizer (optional): For some small production lines or occasions where the shape of the pellets is not required, a flat die pelletizer can be selected. The flat die pelletizer has a relatively simple structure and low cost. It consists of a flat die, a pressure roller, a transmission device, a feeding device, etc.

Cooling and screening area

  • Countercurrent cooler: It is composed of a machine body, a cooling fan, a discharging device and a control system. The machine body is designed with a cooling air duct and a material channel. The cooling fan sends cold air into the cooling air duct, and forms a countercurrent flow with the hot wood particles in the material channel. Through efficient heat exchange, the heat in the particles is quickly taken away, and the particles are quickly cooled to near room temperature.
  • Air-cooled cooler (optional): The air-cooled cooler is composed of a fan, a cooling air duct and a material conveying device. The fan blows cold air into the cooling air duct. Driven by the conveying device, the material passes through the cooling air duct and exchanges heat with the cold air, thereby achieving cooling.
  • Vibrating screen: It adopts a double-layer or multi-layer screen structure. The screen material is usually a stainless steel wire woven mesh or a punched plate. According to the finished product specification requirements of the wood particle product, select the appropriate screen aperture.

Bagging area

  • Automatic quantitative bagging machine: it can quickly adjust the packaging specifications according to the market demand, and the metering accuracy is controlled within ±0.2% to ensure that the weight of each bag of products meets the standard, reduce the error and improve customer satisfaction.

  • Palletising equipment: the packed products are sent to the palletising area via belt conveyor, and the palletising equipment can be chosen from automatic palletising robot or mechanical palletiser.

Dedusting area

  • Pulse bag filter: The high efficiency pulse bag filter is installed in the dust prone area, through the pulse blowing technology to ensure the air permeability of the bag and dust removal efficiency,To make the concentration of dust in the emission gas lower than the national environmental protection standard.

  • Cyclone dust collector (optional): In the case of raw material crushing and other large amount of dust and coarse particles, the cyclone dust collector can be installed before the pulse bag filter as a pre-dust removal equipment.

Production Process of Wood Pellet Production Line

Production process

Raw material receiving and pre-treatment

Various kinds of wood raw materials in the storage area, such as logs, waste wood, large branches, wood chips and trimmings, are sent to the raw material pre-treatment area by means of conveying equipment such as belt conveyors and bucket elevators. Larger raw materials are firstly cut into wood chips by the wood chipper, and then enter the wood hammer crusher to be crushed into powder with uniform particle size. The crushed raw materials are screened by vibrating screen to remove oversized particles and impurities.

Drying

The pretreated raw materials are transported to the drying area and enter the dryer for drying. According to the initial moisture content of the raw materials and the final moisture content required by the product, the appropriate drying temperature and time are selected. Through heating methods such as steam, hot air furnace or gas, the hot air is fully in contact with the raw materials to quickly evaporate the moisture in the raw materials and reduce the moisture content of the raw materials to between 10% and 18%, meeting the moisture requirement of the granulation process for the raw materials.

Pellet making

The dried raw material enters the pelletizer through the conveying equipment. In the pelletizer, it is squeezed through the die holes on the ring die under the strong pressure of the ring die and the pressure roller to form dense wood pellets. By adjusting the parameters of the pelletizer, such as the ring die speed, pressure roller pressure, feed speed, etc., the quality indicators of the wood pellets such as diameter, length, hardness and density can be controlled.

Cooling and screening

The hot wood pellets coming out of the pellet mill enter the cooling area through the conveying equipment, and are cooled by countercurrent coolers or air-cooled coolers to quickly cool the pellets to near room temperature, improve the stability and water resistance of the pellets, prevent agglomeration and deterioration during storage and transportation, and ensure product quality and performance. The cooled pellets enter the screening equipment and are screened by the vibrating screen to remove unqualified large particles, fine powder and particle clumps that stick together, ensuring the uniformity, integrity and appearance quality of the finished wood pellets, and improving the product's qualification rate and market competitiveness

Bagging

After screening, qualified wood pellets enter the packaging area through the conveying equipment, and first enter the automatic quantitative bagging machine, where they are measured and bagged according to the set packaging specifications and weight. Then, the finished products that have been bagged are transported to the palletizing area through the conveying and palletizing equipment, and the automatic palletizing robot or mechanical palletizer neatly stacks the packaging bags on the pallet to form a stable palletizing unit, which is convenient for forklift handling and warehouse management.

Raw Material Type of Wood Pellet Production Line

Raw material type

Log wood

Logs, waste wood, waste lumber, waste building templates, etc., are the main raw materials for the production of high-quality wood pellets.

Wood chips

Sawdust is a fine granular waste produced during the wood processing process. It has the characteristics of small particle size and large surface area. It is easy to dry and granulate, and can improve production efficiency and particle forming rate.

Branches

The wood fiber content is high, but the shape is irregular, and it needs to be crushed and screened to make its particle size meet the production requirements.

Scraps

Wood scraps generated by industries such as furniture manufacturing and construction are also an important source of raw materials for wood pellet production. These scraps vary in shape and size and need to be crushed and sorted first.

Finished Product Specifications of Wood Pellet Production Line

Finished product specifications

Particle shape

Usually cylindrical, with a length between 10-30 mm, a diameter between 6-12 mm, a smooth surface, no obvious cracks and defects, and good uniformity and consistency of particles.

Particle density

Generally between 1.0-1.3 g/cm3, with a high density, which can ensure the strength and hardness of the particles and facilitate storage, transportation and use

Moisture content

The moisture content of the finished wood particles of 10%-18% can not only ensure the molding quality and combustion performance, but also facilitate transportation and storage.

Ash content

The ash content is no more than 3%, which can reduce ash generation during the combustion process and reduce corrosion and wear of combustion equipment.

wood pellet
Straw Pellets
Cow dung pellets

Schematic Diagram of Production Process of Wood Pellet Production Line

Production process diagram

Schematic Diagram of Production Process of Wood Pellet Production Line

Successful Cases of Wood Pellet Production Line

Successful Cases

A wood pellet processing plant in India

A wood pellet processing plant in India

A wood pellet processing plant in the Philippines

A wood pellet processing plant in the Philippines

A wood pellet processing plant in Indonesia

A wood pellet processing plant in Indonesia

For more details or to get a customised solution, please contact our technical team. We will provide the most suitable wood pellet production line design and quotation according to your needs.

Scroll to Top