As we know, there are many factors that may influence the process of briquetting, both in good and bad ways. This post will talk about one of those factors, the particle size and shape, to help users gain a better understanding of the briquetting process and produce briquettes with better quality.
Particle size and shape are of great importance for biomass densification. It is generally agreed that biomass material of 6-8 mm size with 10-20% powdery component (< 4 mesh) gives the best results. Although the screw extruder which employs high pressure (100 0 - 1500 bar), is capable of material of oversized particles, the will not be smooth and clogging might take place at the entrance of the die resulting in jamming of the machine. The larger particles which are not conveyed through the screw start accumulating at the entry point and the steam produced due to high temperature (due to rotation of screw, heat conducted from the die and also if the material is preheated) inside the barrel of the machine starts condensing on fresh cold feed resulting in the formation of lumps and leads to jamming. That is why the processing conditions should be changed to suit the requirements of each particular biomass. Therefore, it is desirable to crush larger particles to get a random distribution of particle size so that an adequate amount of sufficiently small particles is present for embedding into the larger particles. The presence of different size particles improves the packing dynamics and also contributes to high static strength. Only fine and powdered particles of size less than 1 mm are not suitable for a screw extruder because they are less dense, more cohesive, non-free flowing entities.
Besides the particle size and shape of raw materials, there are many other factors, such as the moisture content and temperature, etc. In the following post we will talk about the two factors in detail.
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KMEC is one of the earliest and largest biomass briquette press manufacturer that provide our customers with qualified products, competitive biomass briquette price and superior service. If you need biomass briquetting press, please feel free to contact us.
TEL: +86-372-5388851
FAX: +86-372-5388852
E-mail: info@chinapeanutmachinery.com
http://www.woodbriquetteplant.com/
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