The production of fuel pellets from sunflower husks can be subdivided into the following technological areas:
I. The supply area:
The husks are being fed from the pillowing and winnowing department into the storage hopper. The metal inclusions have to be filtered out in this working area.
II. The grinding area:
In the grinding area the raw material (the husks) is being fed from the storage hopper into a hammer mill, where it is being ground into the particles of necessary size.
III. The pelleting area:
The ground raw material is being fed into a dispenser, from where it comes in pre-determined doses into a mixer where it is being treated with vapor and, if required, with water; that makes it more conformable to pressing. After that the moistened raw material is being fed into a pelletization chamber, where the pelletization process proper takes place. After being treated by the pellet mill the pellets contain excessive moisture; their temperature is about 80°С; they are also excessively fragile; due to all these factors they are being sent to the next processing stage, which is cooling. During the process of cooling the temperature of pellets drops to the environmental level, the excessive moisture is withdrawn and the pellets acquire the necessary degree of firmness. Certain spilled particles are present in the bulk of the product processed in this way. These particles are being filtered out with the help of a sifting vibrator and sent back for the re-processing.
IV. The packaging area:
The ready-made pellets, depending on the type of an enterprise’s transportation infrastructure and the consumer demands, can be packed into soft "big bag" containers of 500-1000 kg each or be dispatched in bulk.