The 1.5 t/h sawdust pellet plant is specially popular among the wood pellet manufacturers. The complete production procedures include sawdust drying, pelletizing, cooling & screening, and pellets packaging.
1. Sawdust Drying
Our rotary dryer is designed specially for drying the sawdust, wood shavings, wood chips, sugarcane bagasse and other small size high moisture contain materials. The heating source of the dryer is pellets, wood, briquettes, coal and any biomass materials, feed these materials into the stove and provide heating to the whole system. The rotary dryer is made up of stove, rotary dryer main body, air fan, cyclone, air lock, pipeline and electric control cabinet. The rotary dryer can reduce the moisture of the raw material from 55% to 15%, to make it suitable for produce briquettes and pellets. It adopts hot air to reduce the moisture content of the raw material. The hot air is generated through heat stove at one end of the rotary body, then the hot air will flow with the help of air fan’s suction and when raw material comes through the rotary body, hot air pulled over the material and they product heat exchange, thus the material will be dried with high efficiency.
|Main power||7.5 Kw|
|Fan power||18.5 Kw|
|Air lock power||0.75Kw|
|Sawdust moisture||30-40 %|
|Inlet hot air temperature||150-250 degree|
|Discharge temperature||60-80 degree|
|Main motor rotating speed||970 rpm|
|Dimension||1.5m in diameter and 11.5m in length|
The pellet machine is the main equipment in the production line to make pellets, it compress the dry finely pulverized material and transform them into a cylinder shape pellet at a temperature of 80 degree. The raw material is delivered into the pallet machine though the conveyor and then transferred into a rotating ring die by a feeder. Finely pulverized material will be pressed into ring die through two press rollers. The resulting pressure compresses the material and extrudes it through the holes in the die.
Driving gear adopts the high precision gear transmission structure. The bearing is SKF brand from Sweden, which is efficient and durable. The ring die adopts the couping fastening method, which is increasing the speed of discharge comparing with the past bolt fastening method. As a result, the capacity is 10-15% higher than the belt transmission structure. As per the ring die and roller of the wood pellet machine, we have the fine machining with the alloyed steel. And our heating treatment is also different from the other domestic manufacturer, our carburizing treatment make the depth of hard facing to 2mm, which improve the anti-abrasion of the ring die and roller more than 10 times, it can save the production cost heavily.
|Feeder Motor Power||2.2 Kw|
|Ring Die Diameter||508 mm|
|Ring Die Speed||150RPM|
|Ring Die Material||20 CrMnTi|
|Ring Die Working Temperature||80℃|
|Feeder Auger Speed||12-120RPM|
|Pellet Size||6mm, 8mm, 10mm, etc|
3. Cooling & Screening
The cooler is used to reduce the temperature and moisture of the pellets, thus to acquire better hardness and strength. Also it can enhance the transport ability and storage ability. The vibrating screen after the cooler is used to removes underside produce and dust, which can be returned to the pellet mill. The cooler process is the refined technology of exposing processed product to an upward moving stream of ambient airflow. As the air rises through the pellets, it is warmed, increasing the moisture carrying capability of the air. The product entering at the top of the cooling chamber is exposed to the warmest air available within the cooler. The product and air have opposite flows, the gradual heat transfer greatly enhances the product quality and reduces stressing and fines.
4. Pellets Packing
After cooling, wood pellets would be packed into bags in order to avoid affected with damp. Packed pellet would be transferred by truck and sold.
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