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Wood Pellet Mill

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Wood Pellet Mill
APPLICATION: Wood Pellet Production
WhatsApp: +86 138 3838 9622

Wood pellet mill is mainly a machine that uses sawdust, wood flour, wood bran, sawdust, wood shavings, bamboo shavings, bark, etc. as raw materials, and processes the raw materials into wood pellets through processes such as crushing, drying, pelletization (granulation), and cooling. device. Richi Machinery is a wood pellet machine manufacturer in china, offers service through a worldwide network in nearly every country. You can get supported directly from RICHI by teams of pelleting technology specialists.

24 hours to reply to technical inquiries

What's wood pellet mill?

Wood pellet mill is the key component in a complete wood pellet plant. It is mostly used to process wood materials like wood chips, sawdust, shaving, tree branches, logs, wooden pallets and so on, it is a kind of high efficiency wood pellet maker. Also, it can process other raw materials like palm fiber, sugarcane bagasse, peanut shell, corn stalk, wheat straw and many other agro-wastes.

As a raw material; wood (hard and soft woods), wood chips, sawdust, hull, tree branches, tree leaves and similar forest residues are used.

  • Hardwoods; Mahogany, Walnut, Oak, Ash-tree, Birch, Maple, Cherry-tree, Beech etc.
  • Softwoods; Pine, Larch, Picea etc.

Applications Of Wood Pellet Mill

Wood pellet machine is an extrusion equipment for making cylindrical pellets. It is mainly used in biomass fuel, crude fiber feed, granular activated carbon, carburizer and other industries. The specific uses are as follows.

As a wood pellet machinery supplier, Richi Machinery manufactures and supplies the key wood pellet processing machine and othe processing machine in the wood pellet production line. RICHI wood waste pellet machine can be used for wood and various agricultural and forestry wastes, which is applicable for all kinds of biomass materials. We also offer single machines for the production of biomass wood pellets, solid biofuel, and waste pellets.

wood  pellet mill cost
  • Biomass fuel industry: Various wood waste, straw, rice husks, peanut shells, palm shells, corn cobs, waste cloth and other materials can be compressed and pelletized as environmentally friendly fuel pellets to replace coal.
  • Crude fiber feed industry: The wood pellet machine can also be used as a professional equipment for making crude fiber pellets (straw, hay, etc.). It has large torque and can withstand high pressure. It is easier to use it to make crude fiber feed pellets.
  • Granular activated carbon and carburizer industry: The raw materials of carburizer and activated carbon have the same properties, both are similar to carbon powder. Adding certain additives or moisture can be easily formed by pressing with a wood pellet mill.
  • ...

The global warming impact, the increasing prices of fossil fuel, and the need to produce thermal and electrical energy stimulated the creation of an industry leaning toward energy production by renewable sources. Biomass is a widespread renewable source to provide energy demand in terms of electricity and heat. Of course, wood pellets have many other uses, such as cat litter, organic fertilizer, etc.

Wood is by far one of the oldest and most abundant types of biomass raw materials. In addition to cord word, other types of forest products residues such as tree tops, branches, bark, logging slash, and saw mill waste can be used as sources of biomass energy.

Technical Specifications Of Wood Pellets
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Technical Features Of Wood Pellet Mill

The wood pellet mill is mainly composed of a feed port, a compression chamber, a discharge port and an electrical control system. Among them, the compression chamber is the core part of the granulator. It is composed of multiple compression molds and can compress waste wood materials such as sawdust into pellets. The quality and quantity of compression molds are important factors affecting the performance of the wood pellet mill machine.
Technical Features Of Wood Pellet Mill

  • The wood pellet mill main shaft system uses double support structure without shake to offer more extrusion force from ring die;
  • The wood waste pellet machine control device of ring die and roller is external to realize gap adjustment without stop-working;
  • The wood pellet machine rollers use circulating water cooling, realizing lower temperature and longer service time of bearings, and lower oil consumption;
  • The bearings of main shaft and roller with temperature measuring device, which can monitor the working status of wood pellet making bearings;
  • The wood pellet maker key components like main shaft, driving wheels and gears are made of high strength forged alloy steel. Gears are processed by high precision gear grinding machine;
  • The wood pelletizer driving system uses imported bearings to ensure the reliability and long service time of the equipment;
  • The pressure roller is cooled by circulating water. The bearing has low operating temperature and long service life, which can reduce grease consumption;
  • The main shaft, transmission wheel, gears and other key parts are all made of high-strength forged alloy steel, and the gears are processed by high-precision gear grinding machines;
  • The transmission system uses brand bearings to ensure the reliability and service life of the main engine;
  • The ring die and pressure roller are made of high-strength forgings, drilled by automatic gun drilling and vacuum quenching heat treatment, and the working life of the ring die is >500 hours.
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill
Technical Features Of Wood Pellet Mill

To get detailed wood pellet mill machine parameters, price list, spare parts and more, please feel free to contact us directly. Our professional technican and sales are always here for you! Now, visiting our factory by remote video is available. And, we also provide pelletizing testing service for different raw materials. Any questions, please just contact RICHI Machinery without any hesitation!

Characteristics of wood pellet mill machine

  1. Renewable energy: The raw materials used in the wood pellet mill are renewable resources such as wood waste and bamboo waste, which have little impact on the environment and can be reused after use, which is in line with the current development trend of green environmental protection.
  2. High efficiency: The wood pellet machine can press raw materials of various shapes into neat pellets, which improves the utilization rate of raw materials and production efficiency, and can significantly reduce production costs.
  3. Intelligent: The new wood pellet machine adopts an advanced intelligent control system, which can realize automated production, and can monitor and adjust various parameters in the production process in real time, making the production process more scientific and accurate.
  4. Widely used: Wood pellet machines are widely used in various industries, such as construction projects, furniture manufacturing, boiler heating, etc. It can also be used as fuel for biomass power plants, providing these companies with clean and efficient energy solutions.

Working Principle Of Wood Pellet Mill

With the gravity power, the centrifugal force generated by the rotation of the ring die, and the feeding scraper, the steam conditioned powder materials will be evenly fed into the two pressing areas in the ring die, which is a wedge-shaped space formed by the ring die and the two rollers.

Under the strong pressure between the ring die and the pressing rollers, the materials are gradually compacted, squeezed into the die hole of the ring die and formed to pellets in the die hole.

Because the extrusion of the material between the die and the roller is continuous, the formed material is continuously discharged from the die hole in the shape of a column, and then cut by the cutter into particles with the required length.

  1. Typically any wood raw material will require some form of processing prior to being pelletized. This can range from debarking if using whole logs (round wood) to shredding or grinding of pallets, or ag products. Once the product is shredded or ground, it could require further processing through a wood pellet hammer mill, depending on how it was received.
  2. If the wood waste raw material is wet (over 15%) it will need to be dried. After sizing and drying if needed, the product is now ready to be pelletized. Pellets can be made in a wide range of diameters and bulk densities, which is typically determined by the end use of the pellet. The wood pellet machine ring die specifications can be changed, allowing for multiple sizes to be produced from the same wood waste pellet machine.
  3. In most cases pellets will exit the wood pellet production machine hot (100-170 degrees) and must be cooled. This is done with a pellet cooler by pulling ambient air through the pellets.
  4. Once the wood pellet is cooled to ambient temperature, the pellets are screened to remove any fines that may have been created during the wood pellet production process. The wood pellets are now ready to be packaged by wood pellet packing machine, stored or sold in bulk.
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Wood Pellet Mill Price & Specification

Model MZLH320 MZLH350 MZLH420 MZLH520 MZLH768 MZLH858
Output (t/h) 0.3~0.5 0.5~0.7 1.0~1.5  2.0~2.5 2.5~4  4~5
Main motor power (kw) 22 37 90 132 250 280
Main motor series 8P
Ring die diameter (mm) 320 350 420 520 762 858
Finished pellet diameter (mm)  6-12
Device Configuration Ring die material: 42CrMo
Stainless steel feeder: with anti-caking function
Door of pelleting room: 6mm /SUS304
Forced feeding: Worm gear reducer
Gear box: HT250
Gear: 42CrMo
Gear shaft: 42CrMo
Spindle: 42CrMo
Empty shaft: 42CrMo
Bearings: The gear shaft and main shaft bearings are SKF, and the pressure roller bearings are domestic high-quality bearings
Oil seal: Germany/Taiwan
Overload mechanical protection: safety pin
Serpentine spring coupling drive
Lubrication system: Configurable automatic oil injection system

Wood Pellet mill project (Typical Case)


With a strong reputation for reliability and excellence, RICHI Machinery is your go-to supplier for high-quality wood pellet mill. Our wood pellet making machines are designed for optimal performance, ensuring consistent and efficient pellet production. What sets RICHI apart is our comprehensive approach – we also offer complete wood pellet mill plant solutions tailored to your specific needs. From initial design and installation to ongoing support and maintenance, we are committed to your success. 

Up to now, we have built wood pellet mill plant around the world, such as Indonesia, United States, German, Thailand, Canada, Germany, United Kingdom, Australia, Malaysia, Italy, Morocco, Philippines, Vietnam, South Korea, Ghana, Portugual, Chile, Canada, and more. If you are interested in knowing more, very welcome to contact us anytime!  

Equipment needed in complete wood pellet mill plant

A complete wood pellet mill plant requires major equipment such as wood chippers, crushers, dryers, wood pellet machines, pellet coolers, and packaging machines, as well as conveyors, electric control cabinets and other conveying equipment and control systems.

Wood Debarker

Wood Debarker

Main Power:
wood splitter

wood splitter

Rotate Speed:
10-20 KW
wood chip Dryer

Rotary Dryer

Rotate Speed:
3-8 R/Min
Wood Chipper Machine

Wood Chipper Machine

Main Power:
4-110 KW
Sugarcane Bagasse Hammer Mill

wood Hammer Mill

Main Power:
wood pallet crusher

Pallet Shredder

Main Power:
55-110 KW
wood pellet cooler machine for sale

wood Pellet Cooler

Main Power:
0.75-2.05 KW
wood pellet Bagging Machine

wood pellet Bagging Machine

6-12 Bags/Min
Main Power:
Wood Pellet Mill

wood pellet mill

Main Power:
wood pellet screener

wood pellet screener

Main Power:
1.5-5.5 KW

conveyer machines

Conveying Distance:
Main Power:
Pulse dust collector

Pulse dust collector

Main Power:

How Are Wood Pellets Produced By Complete Wood Pellet mill Plant?

Complete wood pellet manufacturing process is shown below: 

How Are Wood Pellets Produced By Complete Wood Pellet mill Plant

  1. In global market, wood pellets are mostly produced from sawdust, wood shavings and other woody byproducts. Traditionally, wood pellet production line units are located on or nearby sawmills and other wood processing sites, representing complementary outlet for these wood pellet manufacturing plants. In this context, a first crucial step for wood pellet producers consists of grinding and drying the moist wood residues.
  2. The energy needed for this is mainly made available by the burning of bark or any low quality wood, which likewise accumulates on site. In many cases, not only is heat produced by burning the bark, but also electricity that can be optimally used to run unit. After the wood waste is dried, it is fed into a biomass wood pellet mill. Within the wood pellet maker, dry woody materials are squeezed through a die with holes of the required size (normally 6 mm diameter, sometimes 8 mm or larger) called a matrix.
  3. The high pressure of the wood pellet pressing machine causes the temperature of the wood to increase greatly, causing the surface to plasticise slightly to form a natural "glue" that binds the wood pellet together as it cools. To facilitate the wood pellet pressing process and improve quality parameters, small quantities (max. 2%) of natural binder such as starch can be added, but no glues enter the composition of wood pellets.
  4. Newly compressed pellets are now ready to be cooled and sieved to remove any residual particles. Finally, wood pellets can be stored and/or bagged by wood pellet packing machine prior being delivered to end consumers.
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Wood pellet business plan & wood pellet manufacturing project report

Richi Machinery have provided 1-40t/h wood pellet production lines, wood pellet manufacturing plants and single wood pellet making machines for hundreds of wood pellet manufacturers, and we hope that in the future, we can also help you successfully realize a high-efficiency, high-quality, and high-return wood pellet production business.

The followings are some wood pellet plant project proposal / wood pellet business plan/ wood pellet manufacturing project report for you:

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Why is the wood pellet mill popular with investors?


Good market prospects

Traditional energy can no longer meet the needs of the global market. Biomass wood pellet fuel, as a substitute for coal, can just make up for this energy gap.


Sufficient source of raw materials

The annual output of biomass wood energy such as straw exceeds the total energy demand, and as a renewable resource, their reserves are very abundant. Therefore, it currently has a good market prospect as an energy source.


High profit

The raw materials of the ring die wood pellet mill machine are crop stalks and so on. The cost of these materials is low, the cost per ton is low, and the processing output of the pellet mill equipment is high. In the face of huge market demand, the industry has considerable profits.

how to shoose wood pellet mill

how to shoose wood pellet mill?

When purchasing a wood pellet machine, you need to pay attention to the following points:

  1. Understand the raw materials: Different raw materials require different wood pellet mill machines. Therefore, before purchasing a wood pellet machine, you need to understand what raw materials you need, and then choose a suitable wood pellet mill.
  2. Understand the production capacity: Different wood pellets machines have different production capacities. Therefore, when purchasing a wood pellet mill, you need to understand your production needs and choose a wood pellet machine with suitable production capacity.
  3. Understand the quality of the machine: The quality of the machine directly affects the production efficiency and the service life of the machine. Therefore, when purchasing a wood pellet machine, you need to understand the quality and reliability of the machine and choose a machine with reliable quality.
  4. Understand after-sales service: Good after-sales service can ensure the normal use of the machine and extend the service life of the machine. Therefore, when purchasing a wood pellet machine, you need to understand the manufacturer's after-sales service and choose a manufacturer with good after-sales service.

In short, as people's attention to environmental protection and efficiency continues to increase, wood pellet mills, as an environmentally friendly and efficient energy production equipment, will play an increasingly important role in future development. I hope the introduction here can help you better understand this equipment and provide better help for your production and life.

faqs of wood pellet mill

Types of wood pellet mills for sale

According to the shape of the pressing die, pellet mill for sale can be classified as:

In both cases, there has to be a rotary element, which can be the die or the rollers. In the case of flat dies, the rollers are the moving element, whereas the most common design of ring dies is where the die is powered and rotating, and the rollers move due to the friction and movement of the die.

  • Ring die pellet mills, which are applied to small, medium and large-scale pellet production industries. In other words, unless it is a scale of tens of kilograms or less than 100 kilograms, the ring die wood pelletizer can be applied to any size of wood pellet production business.

    In the wood pellet machine ring die, there are radial slots throughout the die. The die is positioned vertically, powder is fed into the centre of the die and spreaders evenly distribute the powder. Two or more rollers then compress the powder through the die holes. Two cutters are used to cut the wood pellets free from the outside of the die.
  • Flat die wood pellet mills, is a kind of homemade wood pellet machine, which are used for very small scale wood pellet manufacturing (for home use, for mini scale). Flat die wood pellet makers use a flat die with slots. The powder is introduced into the top of the die and, as the die rotates, a roller presses the powder through the holes in the die. A wood pellet machine cutter on the other side of the die cuts the exposed pellet free.

Ring die pellet mill or flat die pellet mill, which is better?

Although we also design and manufacture flat die wood pelletizers, with the continuous improvement of the processing technology of wood pellets, the characteristics of the flat die wood pellet manufacturing equipoment are not as good as the absolute advantages of the ring die wood pellet press machine.

As a professional wood pellet mill manufacturer, we must sincerely tell everyone that the wood granulator technology must move forward, and the ring die wood granulator is the final trend. Considering the quality of equipment, durability, maintenance cost, and quality of finished pellets and other aspects, if the output you need allows, try to choose a ring die wood pelleting machine.

Usually you can see many flat die wood pellet makers on the Internet, which will confuse many customers who are in the wood pellet processing industry for the first time. In fact, well-known and professional wood pellet mill manufacturers do not recommend purchasing flat die pellet mills for wood and biomass pellets, because the quality of the actual processed pellets is not good, and the output cannot keep up.

When you browse the official websites of groups such as CPM and Buhler, you can easily see that there is only a ring die pellet mill machine (which can also be a wood pellet extruder or feed pellet extruder), and there will never be a flat die biomass wood pellet making machine.

Types of wood pellet mill die

There are different die types of RICHI ring die pellet mill for wood pellet plant that vary with regard to hole depth, hole pitch, hole width and die material.

  • The depth of the hole is not related to the length of the pellet. It establishes the time the material is exposed to heat and pressure. Longer holes are recommended for materials with low lignin content to achieve better melting and, therefore, a harder, denser pellet.
  • The pitch angle of the hole influences pellet compression, and it should be designed according to the feedstock.
  • For biomass pellets, the most common diameters are 6 and 8 mm. These diameters, as well as the length of the pellets, are limited by the Pellet Standards to assure that the wood pellets can be fed by the screw conveyors of standardized stoves and boilers without blocking the feeding systems.

    Experience has shown that thinner pellets allow a more uniform combustion rate than thicker ones, especially in small furnaces. The length of the pellets affects the fuel feeding properties: the shorter the pellets, the easier to arrange for continuous flow.
  • Wood pellet pressing machine ring dies are made from several different types of metal. Dies for wood pellet makers must be resistant to abrasion, strong enough to handle the forces of pellet production and corrosion resistant without negatively affecting productivity.

    The materials most often used are carbon steel alloy, stainless steel alloy and high chrome alloy. Obviously, the most expensive materials ensure higher resistances and productivities of the wood waste pellet machines.

These parameters have to be optimized in view of the particular feedstock to guarantee good productivity and to avoid blocking the wood pelletizing machine dies. Blocked dies can be found when:

  • The wood pellet raw material generates more resistant force while passing through the die than the force generated by the roller;
  • The wood pellet machine die hole is corroded.

If the wood pellet making machine ring die gets blocked, the material has to be drilled out. To facilitate this process, it is best to work when the die is still warm, previous to the formation of hard pellets within the die holes.

Energy content for various wood residue(dry weight basis)

The application of wood residue pellets is increasingly widespread, but the application as fuel pellets is still dominant. Therefore, it is still necessary to discuss the raw materials of wood pellets.

Raw material KJ/Kg (KiloJoule/Kg) Kcal/Kg (Kilo calories/Kg)
  lower calorific value higher calorific value lower calorific value higher calorific value
Oak wood 17400 18800 4159 4493
Birch wood 18700 20100 4469 4804
Pine wood 19500 20800 4661 4971
Douglas pine wood 19700 21000 4708 5019
Spruce wood 18500 19800 4422 4732
Cherry wood 17900 19100 4278 4565
Cypress wood 21500 23000 5139 5497
Elm wood 19000 20500 4541 4900
Eucalyptus wood 18300 19600 4374 4684
Maple wood 18700 20000 4469 4780
Larch wood 18700 20100 4469 4804
Poplar wood 19400 20800 4637 4971
Teak wood 18900 20200 4517 4828
Coconut trunk wood 16600 17800 3967 4254
Willow wood 17300 18600 4135 4445
Hardwood bark 18300 19600 4374 4684
Oak bark 18300 19300 4374 4613
Pine bark 19700 21000 4708 5019
Spruce bark 19100 20300 4565 4852
Cedar bark 19800 21100 4732 5043
Douglas fir bark 20800 22100 4971 5282
Eucalyptus bark 17.300 18.500 4135 4422

Why Choose Richi

why choose richi
why choose richi

Introduction of RICHI
Strength certification

Richi Machinery is a professional manufacturing enterprise integrating scientific research and development, manufacturing, sales and service. We have developed and manufactured multifunctional pelletizers, grinders, mixers, dryers and more than ten categories and more than 30 models of complete machine products are widely used in feed, biomass, organic fertilizer, pet supplies, solid waste recycling, chemical industry, road construction and other fields.

All RICHI products have passed ISO9001:2008 international quality system certification, EU CE certification and Customs Union CU-TR certification, successfully serving more than 2,000 customers in more than 100 countries and regions around the world.

Customized Design And Business Plan

In RICHI, every equipment and every pellet production line business plant can be customized. We will formulate multiple sets of pellet production process plans for comparative analysis according to the actual needs of customers, select a reasonable plan, and realize private customization.

Our services run through all aspects of on-site terrain and environment survey, production line process design, raw material testing, cost requirement analysis, project investment budget, equipment installation and commissioning.

Customized Design And Business Plan
Customized Design And Business Plan
Customized Design And Business Plan
Customized Design And Business Plan

Quality Control
Richi Machinery

We adhere to the ISO9001 quality management system, and strictly implement international standards for product design and manufacturing processes. In terms of management systems, there are product quality accountability systems, product quality accountability systems, and safety production management systems; in terms of management tools, QC quality control management, SPC statistical process control, sampling inspection and measurement system analysis are used for quality control, to achieve effective control of the entire process of equipment production, and never let go of any quality hidden dangers that may affect customer operations.

Quality Control

Delivery And Installation

RICHI has always been adhering to the spirit of craftsmanship to make every detail good, especially in the link of equipment preparation and delivery, we follow the standardized process: preparation order check-equipment factory quality inspection-packing list re-inspection-scientific packaging and transportation, ensure the safe and non-destructive delivery of equipment.

According to customer needs, RICHI installation engineers will guide the construction of site infrastructure, equipment installation and commissioning and trial operation of the entire production line throughout the process. When the relevant project indicators reach the design standards, the client will carry out the project acceptance.

Delivery And Installation
Delivery And Installation
Delivery And Installation
Delivery And Installation
Delivery And Installation
Delivery And Installation
Delivery And Installation
Delivery And Installation
After-sales And Training

After-sales And Training
Richi Machinery

We have built a team of nearly 100 technical engineers to solve a series of problems in the project from consultation, site survey, sample analysis to plan design, installation and commissioning, and maintenance. We provide comprehensive and systematic training for the technical staff of each customer to better serve the customer's project needs.

After the technicians have finished their studies, RICHI will provide follow-up technical support services, and the training engineers will follow up the project use effects in the later stage to ensure the stable operation of the customer's project.

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