The pellet mill is obviously the key piece of equipment in pellet making. Once the material has been prepared appropriately, it is feed at restricted rates into the pellet mill. The pellet mill either comprises of a flat die or ring die design, though both designs have a die as well as two or more rollers rotating against the surface of the die. The speed of the pellet mill die, die hole angels, die depth plus roller height play crucial roles on the quality of pellets that are produced. Pellet making is a technically demanding process to achieve quality pellets, an efficient and reliable process with lowest power consumption. A pellet making machine is a definition used by means of some to describe either a pellet mill or pellet press. The use of a pellet making machine can take many forms, from producing animal feed pellets to wood energy pellets, in addition to even cooking pellets for wood pellet grills.
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Each pellet making machine has different characteristics depending on what type of pellet they are generating as well as from what type of raw matter. Particle size and material density impact on which machines are suitable along with the energy required. A biomass pellet machine has specific features which enable a wood pellet machine to create wood pellets more efficiently. Biomass is a high density wood, it therefore requires more power to compress the wood into pellet form. Therefore biomass pellet machines generally have more power, or a lower gearing to enlarge torque to the pellet mill. Also to gelatinise biomass requires more heat than many other biomass raw materials. In many cases dry steam is used to heat the raw material to the required temperatures, this again requires one more source of energy.
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Pellet making is a skilled process, quite a few variables plus factors have to be restricted to make an efficient process in generating quality pellets. Moisture control is a key feature of pellet making. To make pellets, most raw materials call for an average moisture percentage of between 10-15%. Though the consistency of the batch in terms of moisture is also important. Poor consistency within the raw material will produce poor consistency in pellet quality. Depending on the end use of the wood pellets, the raw material used must be chosen carefully. For case in point premium fuel pellets demand a exact quality of raw matter to make an ash content below 1%. This technique the wood sourced must contain practically no bark, as well as be from a pine or spruce residue. As stated making biomass pellets demands a greater amount of energy during construction. Making wood pellets also puts a greater demand on the bearings of the machines as well as reduces the life of consumable parts such as dies plus rollers. However many other biomass materials can also be upgraded into pellets for multiple uses, such as fuel pellets. Yet there are issues by means of other biomass pellets in their incineration characteristics.
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