Introduction of biomass pellet manufacturing process

The biomass pellet manufacturing process is a complex but efficient process involving multiple key steps. The entire biomass pellet making process is a delicate and coherent process, and each link is closely connected and affects each other. At the same time, optimizing the process flow and improving production efficiency and product quality are also important goals of the production line.

Please note that different biomass pellet production processes will vary depending on raw materials, plant conditions, production scale and product needs, but the general process flow is similar. If you want to process biomass pellets, you first need to customize the biomass pellet process according to the raw materials. Even if the raw materials are the same, if the size and moisture of the raw materials are different, then the process will be different.

The following video takes wood log as an example to show you some processing steps of biomass pellets:

How to make biomass pellets?

The following are common biomass pellets manufacturing process flows:

The biomass pellet making process mainly includes raw material preparation, pelletizing, drying, cooling, screening and packaging. Depending on customer needs, raw material or intermediate product storage warehouses, mixing system, finished product bulk warehouses and other links are sometimes set up. These links will be analyzed one by one below.

1. Raw material preparation:

The raw materials of biomass pellets mainly include waste such as straw, weeds, wood chips, sawdust, and energy crops such as corn stalks.

In the raw material preparation stage, these materials need to be chopped, impurity removed and dried to ensure the quality of subsequent pelletizing and drying.

Different raw material types, different sizes, different hardness, and different moisture content will affect the configuration of the crushing equipment. In addition to crushing the raw materials, if the moisture content of the raw materials is too high, the moisture content of the raw materials needs to be reduced to about 15%.

For the pre-treatment process of raw materials, the ultimate goal is only one: to meet the size and moisture requirements for entering the biomass pelletizer, which is about 3mm.

• If the raw materials are small particles such as sawdust and rice husk, it is generally not necessary to set up a crushing section;
• Wood chips, peanut shells and other materials generally need to be equipped with a hammer mill crusher;
• Long raw straw, Miscanthus, reeds and other similar raw materials generally need to be equipped with a hay cutter and a forage crusher; if it is a bundle of haystacks or straw, a bale breaker and a forage crusher are required;
• If it is a rough log, a wood splitter, a peeling machine, a slicer, and a hammer mill are required;
• If it is a wooden pallet raw material, a template crusher and a wood hammer mill are required;
• For palm fruit bunches, palm shells, bamboo, bagasse, cartons, carbon and other raw materials, there are corresponding raw material processing methods.
• After determining the raw material situation, you can directly consult us to customize the raw material processing process

2. biomass pelletizing process:

After the raw materials are processed by the biomass pellet press granular biomass materials are formed. The main process of granulation is to heat and press the raw materials through the die plate to form pellets. The selection and operation technology of the biomass pellet mill have an important impact on the quality of the pellets. For different pellet uses, you need to choose a pellet mill without a conditioner (for fuel and organic fertilizer) or a pellet mill with a conditioner (for feed).

3. Biomass pellet cooling process

After pelleting, the biomass pellets contain high temperature and a certain amount of humidity. The pellets need to be cooled to room temperature and to a suitable moisture content through cooling equipment to prevent the pellets from re-absorbing moisture or deforming.

4. Biomass pellet screening process:

After cooling, the biomass pellets may have a certain amount of fragments or uneven particle size. The screening equipment can remove unqualified pellets to improve the uniformity and quality of the pellets.

5. Biomass pellet packaging process:

After screening, the biomass pellets can be packaged. Common packaging methods include bagging and bulk. Different packaging specifications can be selected. Pay attention to moisture-proof, flame-proof and permeability when packaging.