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The Required Moisture Percentage For Pellet Production Before pellet fuel can be produced, the raw material used must have a suitable and consistent moisture content. On average to produce quality pellets, with a good mechanical durability, requires a raw material moisture content of around 15%. To put this into perspective virgin wood residues usually contain around 60-70% moisture. Therefore the biomass raw material may require drying, before pellet compression in the pellet mill can take place. Particle Size Reduction Necessary for Biomass Drying Solutions Before the biomass can be dried down to the necessary 15% for pellet production, it must also be reduced to a small particle size if required. A suitable particle size of 5mm or below is required to achieve an efficient and accelerated drying process ready for pellet production. |
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Hot Air Current Dryers On a small scale, the simplest and most cost effective way to dry biomass particles is with hot air current dryers, which are also commonly referred to as pipe dryers. At the start of the dryer is the hot air stove. The stove can use waste wood, logs, briquettes or pellets to generate the hot air required for drying. A fan is used to create the required suction through the pipe network. The raw material particles are entered at the start of the pipe work system, and the fan pulls the hot air and particles, which are suspended in the hot air stream, from the stove through the pipe network to the cyclone separator. |
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GJ Series Hot Air Current Dryer Features The GJ series come in 4 models, with various features and productivities. Each model features a hot air stove, feeding hopper, buffer cylinders, fan and cyclone separator. As the raw material particles are suspended in the hot air stream, the heat transfer between the hot air and particle is rapid. This ensures efficient moisture removal, even with a short transfer time of 3-5 seconds. Once the moist hot air and particles reach the cyclone separator, the particles leave the through the base of the cyclone separator, and moist hot air leaves through the top of the cyclone. The buffer cylinders positioned in the pipe network are to increase particle resonance time in the hot air stream. The biomass particles are now ready for the pellet mill. |
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GJ Series Hot Air Current Dryer Models GJ-4: Capacity = 180-300Kg/h, Fuel Consumption = 30Kg/h, Power = 5KW Features: Single stove, 8-12% raw material moisture reduction per pass GJ-6: Capacity = 200-400Kg/h, Fuel Consumption = 40Kg/h, Power = 6KW Features: Single stove, 8-12% raw material moisture reduction per pass GJ-8: Capacity = 200-400Kg/h, Fuel Consumption = 50Kg/h, Power = 7KW Features: Double stove, 12-30% raw material moisture reduction per pass GJ-9: Capacity = 200-400Kg/h, Fuel Consumption = 50Kg/h, Power = 7KW Features: Single stove with rotary dryer, up to 40% moisture reduction per pass |
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Pellet Production and Combustion Solutions - PelHeat Ltd |
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