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Wood Pellet Factory along with Hammer Mills in addition to Pellet Plants

By: Chris Scott


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Biomass pellet plants are a complete install to equipment used to make biomass pellets, generally for use as pellet fuel. There are quite a few pieces of equipment used to manufacture pellets, including wood pellet mills. One of the first pieces of equipment in the wood pellet plant is the hammer mill or chipper. Before pellet compression can take place the raw matter must be reduced to small uniform size.

The particle size required does vary on the diameter of pellet to be produced and the mm diameter hole in the pellet mill due. For instance, pellet fuel is usually shaped to 6mm pellets, as this diameter of pellet can be used by means of all pellet stoves. Therefore the particle size formed via the hammer mill, chipper or crusher must be smaller than 6mm. Some pellet boilers can use larger diameter pellets, therefore in these circumstances a large pellet could be shaped such as 8mm, therefore the hammer mill must produce particles less than 8mm. These are the minimum requirements for particle size reduction, however there is evidence to support that a smaller particle size of around 3-4mm produces a better quality pellet. The reasons for this is a smaller particle size allows for better heat penetration, to produce a stronger more durable wood pellet fuel.

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Before the raw material is ready for the wood pellet mill, a dryer is usually included in the biomass pellet plant. Most virgin biomass resources have a moisture content of around 50%, plus for pellet construction that figure needs to be closer to 15%. Therefore after the hammer mill, a flash dryer or rotary dryer is included into the pellet plant. A flash dryer is also known as a air current dryer or pipe dryer. The wet particles are carried in a hot gas stream because of a pipe network in addition to buffer cylinders. A cyclone separator is then used to separate the dry particles along with wet air. A flash dryer is usually used for raw material which call for only around 10-20 moisture removed.

For large wood pellet plants rotary dryers are used as they can be restricted. The pellet mill or wood pellet mill is the central piece of equipment in the biomass pellet plant. As stated, before pellet compression in the wood pellet mill can take place, the raw matter must have the correct particle size as well as the correct moisture content. It must also be free from contaminates such as stone or metal, which could damage the pellet mill rollers plus die. Any key feature the raw matter should have for consistent plus efficient quality pellet construction, is matter constituency its self.
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Most biomass pellet plants are used to manufacture wood pellet fuel for pellet stoves along with boilers. As stated this usually technique producing a pellet of 6mm or perhaps 8mm for pellet boilers. Wood pellet plant owners actually prefer producing large diameter pellets, as the fee to create the pellets is less. A large diameter pellet consumes less power during particle size reduction and pellet compression in the pellet mill.

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