Large-Scale Pellet Mill Plants

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True large-scale pellet mill plants will incorporate the use of steam dryers. This makes the recovery of low pressure steam or hot water for district heating possible. The closed system assures zero gaseous emissions. In stand-alone applications a low investment is usually emphasized. Correspondingly less energy efficient solutions like flue gas dryers (drum dryers) or band dryers may be preferred.

Wood Pellet Machines - Dryers

Dryer machine is used to make the moisture content of the raw material feeding into the wood pellet machines or pellet mill plants. Temperatures in the dryer vary depending on the required drying duration. In drum dryers and other such “slow” dryers, the temperature of the raw material should not exceed 200 degree Celsius. This is to eliminate the risks of the material losses due to early stages of pyrolysis. For the same reason, small and homogeneously-sized particles are favorable for an optimal drying process. Large particles imply a risk for pyrolysis on the surface when the inner parts of the particle are insufficiently dried.

To choose the right dryer for your pellet mill plants or large-scale wood pellet machines. It is necessary to be aware of different kinds of dryer machines. Rotary dryers may accept large and variable particle size fuels, but flash and belt dryers usually require crushing of the fuel to a particle size below 10 millimeters. The material will have a bulk density in the range 50-400 kilograms per cubic meter, depending on the type and moisture content. Usually the bulk material will have only moderate flow properties, but will readily permit through-circulation of the drying medium.

Traditional dryers are divided into direct and indirect dryers according to the way of heat transfer. In direct dryers the matter which transfers the moisture away is usually hot gas. The gas is in direct contact with the substance to be dried. These kinds of dryers are, for example rotary drum, flash and fluidized bed dryers. The drying surface is heated with electricity, oil or steam circulating in the tubes of the drying unit, but does not come in direct contact with the dried material. Large-scale operations may also engage in other sophisticated drying methods, often by combining drying with other phases of the pelletization process.

Want to set up your own large-scale pellet mill plants? Planning to buy a dryer for you wood pellet machine? Feel free to contact us if you have any questions. We are here to help you!

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