Vertical Ring Die Wood Pellet Machine Introduction

This roller-driven pellet machine is an energy-saving type professional biomass pelleting machine. With special design, this vertical ring die wood pellet mill is new type roller-driven wood pellet machine. Adopting vertical feeding and ring die, it has advantages of ring die pellet mill and flat die pellet mill. On the other hand, due to the roller-driven design, the vertical ring die wood pellet machine is suitable to process hard biomass material. This length of biopellets can be adjusted easily according to your demand. It is available to process various biomass materials like wood chips, straw, chaff, bamboo shavings, peanut shells, bagasse, and alfalfa, pine, poplar, eucalyptus, birch as well as wood chips, bamboo and so on. If you want to start a biomass pellet making business, this is your choice for where to start.

Performance Features of Vertical Ring Die Wood Pellet Machine

• Vertical die, feeding vertically; No arching of raw materials, easy for heating dissipation.
• Die fixed, rollers rotating, better for even material distribution.
• Independent lubrication; high pressure filtration, clean and unblocked
• Independent and frequency changeable cutting device ensuring high pelletizing rate
• Longer service life, lower power consumption, high capacity and products with better quality.
• Compared to the traditional wood pellet machine, vertically feeding and the rotating rollers of this pellet mill can prevent accumulation of raw material.
• Cooling device in the vertical ring die pellet machine can avoid the problem of heat dissipation of traditional pellet machine.
• According to your demand, the length of pellets can be adjusted easily.
• The aircraft equipped with more than 20 aperture mould, to adapt to the different material granulation, achieve the best effect.

Application of vertical Ring-Die Pellet Machine

• 1. In addition to making wood pellets, this vertical ring die pellet mill can also make feed pellets with higher output than wood pellets.
• 2.This pellet making machine is suitable for large and medium pellet production.
• 3. Adopting advanced technology, roller-driven designed and unique structure, this vertical ring die pellet machine can process various raw material like straw, wood shavings, palm wastes, bagasse, sawdust, wood chips, especially the crude fiber materials which are hard to bind and shape, such as pine, poplar, eucalyptus, birch and so on.

Vertical Wood Pellet Machine Working Principle

When the machine starts to work, rollers move and the ring die remains stationary. The mixed materials fall down directly from the feeding inlet. Under the effect of centrifugal force, the materials are evenly distributed on the internal wall of ring die. Then materials are pressed into the ring die holes by rotating rollers, then formed into cylindrical extrusions under the high temperature and high pressure, which are cut into required length by knives and discharged from the outlet. There are three advantages to the vertical die wood pellet mill. One is that the rotating roller has much longer service life than the traditional design–about 2000 hours. Furthermore wood pellets produced by the rotating roller design are much longer, of up to 3 centimeters or more. Last but not least, roller-driven design ensures more powerful compression on the materials, so it can process hardwood materials into biomass pellets more easily than other die-driven wood pellet mills.

Attention: the smaller the pellet, the greater the cost of production, that is because the diameter of holes decide the diameter of pellets, the smaller the die holes the greater effort is required to compress materials into holes, so the greater power is needed.

Vertical Ring Die Wood Pellet Mill Technical Parameters

Model	Power	Capacity	Dimension	Weight
BLF450	55 kw	0.6-0.8 t/h	1.4*0.75*1.55m	2.2t
BLF460	75 kw	0.8-1 t/h	1.5*0.75*1.55m	2.6t
BLF550	90 kw	1-1.5 t/h	1.9*0.95*1.8m	4.0t
BLF800	160 kw	1.5-2.5 t/h	2.5*1.35*2.1m	6.5t
BLF1000	200 kw	2.5-3.5 t/h	2.65*1.45*2.1m	8.0t

Flat Die And Ring Die Pellet Mills Comparison

Working Principle Of Flat Die Pellet Mill

Generally, there are two types of flat die pellet mills in the market, the rotating die type and the rotating roller type. The former one has a stationary roller with the rotating die while the latter has a stationary die with a rotating roller. Adopting vertical principle, the raw materials drops down by the its own weight into the pelletizing chamber where they are compressed between the rollers and die to form pellets by going through the die holes.

Working Principle Of Ring Die Pellet Mill

The basic pelleting principle of the ring die pellet mill is a simple operation where feed mass is distributed over the inner surface of a rotating, perforated die ahead of each roll, which compress the feed mass and compress it into the die holes to form pellets.

Advantage And Disadvantages Of Flat Die Pellet Mills Are As Following:

• Flat die pellet mills are small in size and light in weight because of the compacted structure design.
• Flat die pellet mils are easier to be cleaned and maintained and cheaper because of the design of portable rollers and die.
• Flat die pellet mils are more convenient for you to monitor the process of pelletizing by watching the pelletizing chamber which make the experiment of indeterminate materials for raw materials expansion easier.
• The disadvantages of pellet mills are they are not suitable for large scale pellet production. And also the gap between the roller and the die is tricky which should be adjustable according to the species of the raw materials especially the hardness of the raw materials.
• All in all, the flat die pellet mills are usually used to process materials with large adhesive force for both fuel pellets and feed pellets in small scale and medium scale pellet production. They are known for the features, such as, reliable operation, greater mobility, low noise, low energy consumption and relatively low productivity, comparing with ring die pellet mills.

Advantage And Disadvantages Of Ring Die Pellet Mills Are As Following:

• Ring die pellet mills generate less wear and tear because the inner and outer edges of the rollers traverse the same distance.
• Ring die pellet mills are more energy efficient than that of the flat die pellet mills.
• One problem of the ring die pellet mills is side slip. Side slip is one undisputable and unavoidable fact on ring die pellet mill. It refers to having feed mash squeezed out sidewise from the nip between the roller and dies, which can be minimized, depending on the die configuration. One way to do this is to counter bore or drill larger hole in the two outer rows of the die so as to reduce the friction caused in the holes.
• In one word, the ring die pellet mills also can be used to produce fuel and feed pellets. However, compared with the plat die pellet mills, the ring die pellet mills are well known for their large capacity for pellet production. They are featured as large capacity, with nice pellet forming shape and high density and high energy consumption.

General Comparison Of The Flat Die And Ring Die Pellet Mills

• Besides, the flat die pellet mills and the ring die pellet mills are different in the following ways:
• 1. Price: The flat die pellet mill is far cheaper than that of the ring die pellet mills.
• 2. Capacity: The output capability of the flat die pellet mill ranges from around 80 to 1000 kg /h at most while the ring die pellet mill can produce around 0.6 to 3 t/h at most.
• 3. Feeding: The feeding of the flat die pellet mills relies on materials weight and the feed stock enters into the pelleting room directly and evenly. While the feeding of ring die pellet mills is forced into the pelleting chamber and distributed by the high speed rotary scrapers.
• 4. Pressure: The pressure of flat die pellet mills is adjustable. The diameter of rollers in the flat pellet mill is not restricted by the diameter of the pellet die so that the roller pressure can be increased by enlarging the inside bearing space, adopting a big bearing which also expands the working life. While as for the ring die pellet mill, the pressure of the pinch roller is limited because the diameter of the rollers are limited by the diameter of the pellet die.
• 5. Discharging: The percentage of damage of flat die pellet mill is lower than that of ring die pellet mills because of the high rotary speed of the ring die.
• 6. Pellets formation: The flat die type have a circular perforated disk on which two or more rollers rotate and force the material through the holes to form pellets. The ring die press features a rotating perforated ring on which rollers (normally two or three) press on the material to the inner perimeter to form pellets.
• Though the comparison, the features of the two different pellet mills are obvious. When purchasing the pellet mills, it is better to consider the all around situation of your pellet production and find the suitable pellet mill.

Compare Vertical Ring Die Pellet Mill Machine And Horizontal Ring Die Pellet Mill Machine

Vertical Ring Die Pellet Mill Working Principle

The vertical ring die pellet mill is specially designed to press the material which is hard to be bonded and shaped. The material can be loaded into the pelleting chamber in its own weight. Then, under the strong pressure between the rotating roller and the ring die, the material enters into the die holes to be formed into pellets. The vertical ring die pellet mill is called light-weight material pellet mill as well. Because vertical pellet mill is more suitable for managing the materials with light weight, such as, rice hull, grass with light weight, straw, melon and fruit hull and the material which is not easy to form.

Horizontal Ring Die Pellet Mill Working Principle

Differ from the vertical ring die pellet mill, the horizontal ring die pellet mill adopts the feeding auger to feed the material into the pelleting chamber through the stock bin. The material begin to be soft in the sealed pelleting chamber, and under the great extrusion between rotating ring die in a high speed and the roller, the soft material is pressed into the holes uniformly distributed on the die. After that, the formed cylindrical solid body out of the holes will be cut by the knife, thus discharged through the export hole.

Features between Vertical VS Horizontal Ring Die Pellet Mill

Vertical Ring Die Pellet Mill

• Vertical ring die pellet mill is applicable for difficult molding materials with low adhesion rate, for example peanut shell, rice husk, fruit shell and sunflower husk; branches, bark, stem and other wood residues, various of crop stalks etc.
• The new generation gearbox adopts high-precision gears, automatic lubricant pump system, keeping the gearbox working stability and warranty period.
• In this vertical ring die pellet mill, the die holes with equidistant distribution are centered by the output shaft, making more powerful and stability of machine working.
• Automatic lubrication system. The gear box is configured with circulation pump lubricating system controlled by the pinch roller to inject oil in timing. The oil pump motor can lubricate with automation and circulation making sure the shaft can be fully lubricated thus making the pellet machine running safely.
• The blower system is equipped in side of the working bin, controlling the working time freely.
• Feeding vertically with frequency conversion makes the feedstock uniform with no arch camber and easy heat dissipation.

Horizontal Ring Die Pellet Mill

• The all-stainless steel feeder, configured with original imported frequency converter to control feeding uniformly and accurately.
• Monitoring system is equipped, solving the problem of high temperature hazard in the pelleting chamber caused by the improper operation thus efficiently avoiding the danger of bursting and fire.
• The components is made by international advanced manufacturing craft and designed according to the characteristics of the material from the customers, prolonging the service time of the equipment.
• The ring die of feed machine with quick-release coupling reduces the time of replacing the ring die and improves the production efficiency.
• Double-motor drive. The high strength SPB narrow V-belt drive transmit with stability and reliability but with low noise.
• The horizontal ring die pelleting mill is configured with many kinds of ring dies with different aperture diameters and compression ratio, the customers can choose according to their needs.

Ring Die Pellet Machine Production Line

Crushing process—–crusher/hammer mill

If the raw material is big logs with diameter less 300mm or big timber cutter, our BX-Series Chipping and Crushing Machine is your best choices; while tear-circle crusher/Hammer Mill is widely used to crush each kind of straw, wood chip, tree branch, bark and leftover bits from agricultural wastes. The best moisture content in the Crushing Process is less 18%, and the thickness of the wood chip is less 5mm. The moving full-wide operation door facilitates maintenance and replacement. It is widely used in various feed mills, oil plants, alcohol plants, citric acid plants, etc.

Drying priocess—–Rotary Dryers

The best moisture content to pelletizing is about 14-16%. Our new Air-Current Rotary Dryer is made up of Burning Stove and Main Rotary Dryer, which can realize to reduce the moisture from 50% to 10%, and save about 30% energy consumption comparing the old Rotary Dryer. Our burning stove is fueled by coal and wood material, which can save electricity consumption largely. If the users want to use the other fuel such as gas and electricity, one Burner is necessary, but the extra cost will be charged.

Pelletizing Process—–Ring die pellet mill

(1). The lubrication system for wood pellet mill adopts the tracing and inspecting system controlled by the microcomputer. When the temperature of the bearing is over the normal temperature, the microcomputer will start the round closed Auto-Lubrication System to lubricate the bearings, which complete solved the trouble of lubricating roller depending on the operation experience. (2). Driving Gear adopts the high precision gear transmission structure. The wear bearing is made from China Biggest Bearing Manufacturer according to our special requests. The ring die adopts the hoop fastening method, which increased the speed of discharge (3). As to the ring die and roller of the pellet mill, we have the fine machining with the alloy steel, such as 40Cr and stainless steel, such as 4 Cr13 . And our heating treatment is also different from the other domestic manufacturer, our lithium grease treatment improves the anti-abrasion of the ring die and roller more than 10 times, it can save the production cost greatly.

Cooling and screening process—–Pellet coolers

The temperature of the pellet is about 70 degree, and the moisture content of the wood pellet is about 15%, so we need use Cooler to reduce about 3-4% moisture, in this way, the pellet is easy to store and transport.

Packing and storing and storing process—–Pellet Packing Machines