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Please find below several questions that we are often asked at Dongfa. Please click on the question to reveal the answer below. If you are considering contacting other companies, you should consider asking them some of the following questions too:
1.Ring Die Pellet Mills and Pellets Mill?
On current market there are different shapes and uses of pellets mills, according to these characters, and we often group pellet mills on the market into two types: Flat die pellet mill and the other is ring die pellet mill machine. Flat die pellet mills are always applied for home and residential uses, on the other hand, ring die pellet mills are generally used to produce pellets for industrial and commercial uses.
Ring die pellet mill is a very popular design of pellets mills. With a ring shape die and a set of rollers, the ring die type is different from flat die pellet mills, they are used to produce wood pellets on a bulk for industrial and commercial purposes, and the rollers just part of the die. Ring die pellet mill is lager than flat die type in size, but the capacity is also bigger than the flat die pellet mill. During the pelletizing process, more friction and more heat occurs during the process, but you should realize this is not totally a bad thing for more heat will help lignin in the wood melt to form perfect pellets. There are till other advantages of the ring die pellet mills. Firstly, it doesn’t suffer uneven roller which means if you use pellet mills of ring die type, less wear will happen, because inner and outer edge of the roller covers the same distance.
The first obvious disadvantage of the ring die pellet mill is its size and weight. For large-scale production, it doesn’t matter at all, but if for small scale wood pellets production it will be a big problem. Changing rollers and dies in the ring die pellet mill need a lot of energy, let alone the dies of the mill, for dies are even heavier than rollers. In most cases lifting equipment is required to remove or replace the die. Apart from that, adjust the rollers is also inconvenient for they need manual roller adjustment, which can only be accessed by opening the pellet mill chamber. However this is not always the case, as some now come with optional remote roller adjustment at extra cost.
2.What Types of Wood Can Be Processed Into Wood Fuel Pellets? A wide range of organic materials collectively known as biomass can be processed into fuel pellets. Wood pellets are the most common form of wood pellets, and are available in different grades. The most popular grade of wood pellets used for home heating are premium wood pellets. Premium pellets are produced mainly from either pine, spruce or oak residue. Premium pellets produce very little ash, of around 0.5%. To produce premium pellets the wood residue must contain no bark, as bark will increase the ash content of the fuel above the premium standard rate. Other wood pellets produced are referred to as standard grade pellets.
3.What Other Materials Can Be Processed Into Biomass Fuel Pellets? Many other materials other than wood residue for premium pellet fuel can be processed into fuel pellets. These include other purpose grown and waste wood residues. These include wood chipping from wood land maintenance and purpose grown energy crop species such as short rotation coppice willow. Other biomass resources which can be processed into fuel pellets include, grasses such as Miscanthus, Reed Canary Grass, Switchgrass and Hemp
Agricultural residues such as wheat and barley straw are also viable biomass resources for fuel pellet production. Other residues from food crop production such as corn cobs can also be processed into pellets. Producing fuel pellets from waste food production residues makes better use of available resources and produces both food and fuel from one crops, without confusing food for fuel. These are just a few of the resources which can be turned into pellets.
4.How Are Pellets Produced?
Pellets are simply a highly compressed form of the original raw material. Final pellet compression takes place in the pellet mill, however there are several processes required initially before the raw material is suitable for the pellet mill. Particle size and moisture content are two crucial aspects that must be controlled before the raw material can enter the pellet mill. To learn more about pellet production and how wood and other biomass pellets are made, please visit the Pellet Guide above.
The simple answer is no, each raw material has its own combustion characteristics. These characteristics range from changes in ash content, to possible clinker and slag formations and corrosion risks due to sculpture and chloride content. Chloride for example is high temperature corrosive, and sculpture is a low temperature corrosive. Different makes and designs of pellet stoves and boilers are produced to handle different levels of ash and corrosion risk.
Wood pellets generate the lowest ash content, and also have the lowest corrosion risk for the stove or boiler. Other biomass fuel pellets such as straw and grass pellets can generate higher levels of ash, and pose a higher corrosion risk to the pellet combustion chamber. Grass and straw pellets however are much cheaper to produce, so much lower fuel costs are possible
6. The Full PelHeat Guide Covers The 10 Steps Of Pellet Production
As you can see from the above information, there is a lot more to mak dropping material into a pellet mill. For this reason we produced the P to help consumers learn the steps to produce quality pellets from a ramaterials. The Guide is broken down into ten steps, as you can see bl
1. Size Reduction: Chippers/Shredders, Hammer Mills
2. Material Transportation: Fans, Cyclone Separators and Scre
3. Drying Solutions: Rotary/Drum Dryers, Pipe Dryers
4. Mixing Solutions: Batch Mixers
5. Conditioning: Water and Steam Addition, Binders
6. Pellet Production: Round and Flat Die Pellet Mills
7. Sieving: Removing Fines
8. Cooling: Counter Flow Coolers
9. Pellet Transportation: Bucket Elevators
10. Bagging and Storage: Bags, Sacks and Silos