bio fuel pellet line makes waste into wealth

Bio fuel pellet line means the production line that makes fuel pellets from biomass. The biomass for producing fuel pellets can be wood, sawdust, bamboo, coconut shell, EFB/palm fiber, stalk, alfalfa, hops, etc.(more raw material see Products.)

The bio fuel pellet production line is divided into around 8 procedures:

Crushing, raw material conveying, drying, pellet production, sieving, cooling, pellet conveying, packing and storage. Below is the detailed process

Bio fuel pellet line process

1. Crushing: wood chipper, crusher or hammer mill.

No matter your raw material is wood, straw, grass or anything else, the first step of bio fuel pellet production line is to crush them into regular small size. Generally the size must be smaller than the pellet size. For example, if you want to produce 6mm pellets, the raw material must be crushed into <6mm.

The wood chipper is used to chip the large size wood into smaller size to be suitable to put into crusher.

The crusher/hammer mill is used to crush raw material with small than 1 inch into final size.

Wood chipper	Hammer mill

2. Raw material conveying: fan, cyclone separator, screw conveyor

Once the raw material enters the hammer mill/crusher, the fan will blow the raw material into cyclone separator, and the cyclone will separate the grinded raw material from air. Then the raw material falls down to the hopper and is conveyed into the dryer.

3. Drying: rotary drum dryer or air flow dryer

The biomass raw material usually contains too much moisture, which is not suitable for direct pellet production. As a result, dryer is needed.

The rotary drum dryer is used for medium to large scale bio fuel pellet line (>500kg/h), while air flow dryer is for small to medium scale bio fuel pellet line (200-700kg/h).

After drying, the biomass moisture content is decreased to around 10%-20% based on different raw materials.

Dryer

4. Bio fuel Pellet production: flat die or ring die pellet mill

Flat die pellet mill can produce 50-800kg/h, while ring die pellet mill can produce 500-2000kg/h.

Flat die pellet mill is easy to clean, and its roller and die are easy and fast to change. It has compact structure and more flexable to use.	Ring die pellet mill is more suitable for processing wood raw material, and the pellets made by ring die pellet mills have higher quality and suitable for sale.

The pellet mill die hole is determined by the pellet size you want to produce and the raw material characteristics.

5. Sieving and cooling:

After processed by the pellet mill, some raw material may remain powder because of the insufficient pressure inside pellet mill or binder is not enough. In this case, the pellets shall be sieved, and the powder can fall down from the sieve, while pellets stay on the sieve. Usually the sieve is vibrating, so that pellets can gradually fall to the pellet conveyor.

And the pellets made by the pellet mill often have high temperature and shall be cooled.

At GEMCO, we have a pellet cooler that can sieve the pellets at the same time. This kind of pellet cooler can save energy and production area, so it is very effective.

6. Pellet conveying: belt elevator

It is used to convey the pellets into the pellet packing machine.

7. Pellet packing and storage: pellet packing machine, bags.

The weight per bag is determined by the client.  

Besides the above discussed procedures, there are actually some other steps needed for the complete bio fuel pellet line based on customer requirement. If you are intending to set up one, just feel free to contact us for free plans!