The pellet mill is obviously the key piece of equipment in pellet making. Once the matter has been prepared appropriately, it is fed at controlled rates into the pellet mill. The pellet mill either comprises of a flat die or ring die design, though both designs have a die plus two or more rollers rotating against the surface of the die. The speed of the pellet mill die, die hole angels, die depth as well as roller height play crucial roles on the quality of pellets that are created. Pellet making is a technically demanding process to achieve quality pellets, an efficient and reliable process by lowest power consumption. A pellet making machine is a definition used with 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 fuel pellets, and even cooking pellets for wood pellet grills.
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Each pellet making machine has diverse characteristics depending on what type of pellet they are producing as well as from what type of raw material. Particle size as well as matter density impact on which machines are suitable along with the energy required. A wood pellet machine has precise features which enable a wood pellet machine to produce biomass pellets more efficiently. Biomass is a high density wood, it therefore requires more power to compress the wood into pellet form. Therefore wood pellet machines generally have more power, or a lower gearing to amplify torque to the pellet mill. Also to gelatinise wood requires more heat than many other wood raw materials. In many cases dry steam is used to heat the raw material to the required temperatures, this again requires an additional source of energy.
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Pellet making is a skilled process, several variables as well as factors have to be restricted to make an efficient process in generating quality pellets. Moisture control is a key feature of pellet making. To manufacture pellets, most raw materials require 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 make 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 specific quality of raw material to make an ash content below 1%. This method the wood sourced must contain practically no bark, in addition to be from a pine or spruce residue. As stated making wood pellets demands a greater amount of fuel during construction. Making wood pellets also puts a greater demand on the bearings of the machines along with reduces the life of consumable parts such as dies and rollers. Yet many other biomass materials can also be upgraded into pellets for multiple uses, such as fuel pellets. Yet there are issues by way of other biomass pellets in their incineration characteristics.
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