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Factors Impacting on Pellet Production

Date: 01-21-2016 Author: dingli

Factors Impacting on Pellet Production
There are many factors affecting the pellet production. In the following, we will introduce some.
The Rate of Feed Put Into Feed Pellet Mill
There is an adjustment that is not well known to have an impact on pellet production. That is the rate of feed put into the pellet mill. In fact, adjustment on feed rate and maintaining a consistent feed rate can be the key factors to impact pellet production,even if the raw material is perfectly prepared.

Conditioning and Steam
Conditioning is the pre-treatment of the raw material before it reaches the pellet mill. Conditioning can include specific mixing techniques and the introduction of additional water or steam. Steam can be used to pre-anneal the raw material and start the lignin melting process. Though conditioning can have several benefits, in some cases, the benefits are negligible and in other cases, it is simply not practical to use conditioning. However, generally, for wood pellet production, steam is used.
Operating Temperatures
Temperature is a key requirement in pellet production. Unless a certain temperature is reached in the pellet mill, natural lignin will not melt. It is not possible to produce some biomass pellets. For example, wood pellets without sufficient heat. However, if the temperature is too high, this can damage the pellet mill and particular consumables such as the pellet mill die, rollers, bearings and seals.
Clearance between roller and die
Another adjustment that can impact heavily on how successfully the pellet mill operates is the distance between the roller and die template. The roller and die are wearing consumable parts, due to the abrasive nature and pressure of compression. The distance set between the roller and die can impact on how much energy the pellet mill uses, the quality of the pellet, pellet mill productivity and the amount of fines produced. Correctly ,setting up the die on a pellet mill will also increase the life of the roller and die, and reduce the cost of changing these consumable parts.
Die Template Rotation Speed
The speeds at which the roller and die turn affect the complex relationships during pellet compression. Some materials require a greater time under compression, and therefore require a slower rotation speed. Also, the speed and torque requirements of the pellet mill change.
Die Design and Metal Used
Many different forms of metal alloy are used to produce pellet mill die templates. Different metal alloys have specific advantages. Using the correct alloy is critical to reduce wear and increase production. The type of metal used also affects the finish of the die holes.
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