The raw material of this plant is a mixture of pine and eucalyptus wood. The capacity of this pellet line is 4.5-6t / h, using three BPM508 Wood Pellet Mill. Feel free to contact us for more details of this pelletizing project.
Video of This Pelletizing Project in Chile
Pellets are timber residues mainly from timber production that have been compressed under intense heat and pressure. These residues include sawdust and ground up wood chips. They are an ideal source of fuel because they have a uniform shape, density and size. In wood pellets processing, the main plant components are: Debarking, size reduction, material transportation, drying, mixing, conditioning, pellet production, sieving, cooling, transportation of pellets, bagging and storage.
How Processing of Wood Pellets is Done in Pelletizing Line
The following process is normally followed in order to produce quality fuel pellets from a range of wood and biomass make up. The raw material is transported from the store into the production unit by a conveyor such as a scraper chain conveyor. This material is then passed into the feed hopper of the hammer mill where the chips are broken down into smaller pieces using hardened flat iron hammers, which are fastened on a rotating shaft till the material is forced through the hole located in the periphery. The fineness of the chips after the grinding process is determined by the size of the holes in the sieve. This is done by using a unit consisting of ID suction fan and filter.
Portable Pellet Plant
In the mixer, binding compounds which act as glue are added. These are agents such as starch and water. Water is added depending on the water content of the chips since for them to form properly, they need to be dry but still have some moisture in them. At the end of the mixer, the chips fall downward onto feed screws. These short screws feed the ring die pellet mill. The chips are introduced between the edge runners arranged in the press and are distributed as uniformly as possible by means of guide blades in order to achieve homogeneous loading.
The pellet mill machine consists of a rotating die and relatively mounted edge runners. The finished chips emerge through the minimal gap between edge runner and die which forces them through the press molding channels in the die. Edge runners and die are positioned adjacent to each other such that the edge runners almost touch the die. After emerging from the rotating die, the chips molded in the press molding channel are cut or broken to the desired length by knives fixed at the periphery. This process needs to be conducted with a lot of accuracy. It is important to have a sampling point below the press for quality control.
More sampling points should be arranged below the sieve in front of the pellet store so as to ascertain the quality of the pellets in the silo. After this, the pellets fall downward through a rotary feeder. Since the pellets, being 70–95 degrees C hot, are still unstable, the cooler is optimally arranged below the rotary feeder. If the licensed height of the hall is not sufficient, the pellets can be conveyed carefully upward into the cooler.
Principle of Operation of the Flat Die and Ring Die Pellet Mill
Ring Die Pellet Mill is The Best Choice for Automatic Pellet Plant
In the counter flow coolers, the pellets are cooled to a temperature which is about 5℃ above the ambient temperature. It is paramount for the cooler to be designed appropriately also for operation in summertime, since the quality suffers considerably if the pellets are inadequately cooled. The cooled pellets are stable and solid ready to be packed in bags, sacks and silos.