In the production of biomass pellets, some problems sometimes occur. The first thing is that the pellets cannot be formed to meet the requirements of customers. This is headache. It is also a barrier that discourages many customers from entering the biomass pellet industry. Let us To find out the reasons.

1. Material. The type of raw material not only affects the forming quality, such as the density, strength and calorific value of the formed block, but also affects the output and power consumption of the pellet mill. The wood itself has a high lignin content and can be bonded at a high temperature of 80 degrees, so the formation of wood chips does not require any adhesives. Therefore, we usually recommend that you use wood chips to make pellets.

2. Moisture of material. The moisture content of the raw material is another important factor. The moisture content of the raw material is too high or too low to make the pellets form well. If the moisture content is too high, the heat transfer rate of the biomass will decrease, which not only affects the heat transfer, but also forms high-pressure steam after the evaporated water evaporates in the holes of the forming mold. This hinders the normal formation of particles; if the moisture content is too low, it not only needs to be high. The molding pressure also increases the energy consumption of the biomass during the drying process.

3. Grinding degree. Generally, raw materials with small particle sizes are easy to compress, and raw materials with large particle sizes are difficult to compress. That is, the smaller the particle size, the easier it is to form. However, if it is too small, there will be too much powder and shorter shaped particles. Therefore, the particle size of the raw material should be controlled to ensure that the strength is small and easy to suppress, and the lignin that can fully release the wood chips can be fully released. For finished pellet fuel with a diameter of 8-10 mm, the particle size of the raw material is usually required to be 3-5 mm. The particle size of the raw material will also affect the efficiency of the pellet mill and the quality of the final product. For example, when the particle size of the raw material is large, the pellet mill will not work effectively, the energy consumption is large, the output is small, and the pellet quality is not good. In order to keep the material size within the range of 3-5 mm, you must use a high-quality hammer mill to ensure output!