What will affect the production of wood pellet making machine?

If user wants to improve the efficiency of wood pellet making machine, the first thing is to find out what factors will affect the pelletizing. In fact, there are many reasons that will affect the wood particle effect, not only the performance of biomass pellet equipment but also the correct operation of wood pellet making machine, and so on. In this article, we will analyze from the raw material itself to see how the sawdust affects the pelletizing of wood pellet making machine.

The five main factors affects wood pellet making machine production

The main factors affecting the formation of wood fiber are wood fiber content, material pressure (compression ratio), particle size, moisture content and granulation temperature.

Compression ratio of wood pellet

Generally, wood fiber compression molding is divided into two stages. The first stage, in the early compression stage, the lower pressure is transferred to the wood fiber particles, so that the structure of the original solid particles arranged in the loose began to change, and the voidage in the biomass decreased. Second stage, when the pressure increases, large pellets of wood fibers break down under the affect of pressure and become smaller pellets, deformation or plastic flow occurred, the pellets begin to fill the void and the particles contact each other more closely and mesh with each other, a part of the residual stress is stored inside the formed block so that the particles are combined more firmly, at the same time, the volume of the material will decrease continuously during the compression process. The particles extend over the plane perpendicular to the maximum principal stress and the area increases, therefore, in thickness, that is, along the direction of the maximum principal stress, it must be smaller and thinner.

Pressure

The material compression molding process is closely related to the deformation (extension)of the material particles perpendicular to the maximum principal stress(surface). The larger the applied pressure, the finer the particle size is, the more remarkable the particle extension is, and the closer the bonding of the molding is, the greater the density.
Wood material particle size
In the process of compression molding, under the same pressure, the finer the size of the material, the greater the deformation under compression, and the closer the molding is, the greater the molding density.

Moisture content of wood material

There is a proper amount of bound water and free water in the organism, They have the function of lubricant, so that the internal friction between particles becomes smaller and the mobility is enhanced, thus, the particles are allowed to slide and be fitted under pressure. When the moisture content of biomass raw materials is too low, the particles can not be fully extended, the particles are not tight enough to form. Therefore, the wood fiber should be kept at proper moisture content during granulation.

Granulation temperature

With the increase of temperature, lignin in the plant begins to soften and can act as a binder. Below 100 degrees, with the increase of heating temperature, the particles gradually soften and become deformed easily, the average diameter of the two direction (forming density parameters of characterizing particle)of the particle increases with the increase of temperature. When the temperature is higher than the softening temperature of lignin, at high temperature and high pressure, the particle properties of plant materials come close to the properties of fluids, the difference between the maximum principal stress and the minimum principal stress (extension)becomes smaller, the deformation of the particles in the direction perpendicular to the maximum principal stress is impeded, therefore, the average diameter of the two direction decreases instead. Therefore, the proper temperature should be controlled when the wood fiber is granulated.

Wood fiber content

Different materials contain different fiber components, when the material with different fiber content is compressed under the same pressure, and the energy consumed and the particle density are different, in other words, for different fiber content of material to get good particle forming effect, we need different pressure (different compression ratio).

Four principles for wood pellet making machine

• It is necessary to check the operation before the production of wood pellet making machine, check that whether the screw of the wood pellet making machine is loose, and whether the driving parts are sensitive or not, ensure that the machine does not have any abnormalities, start the motor, adjust the work speed. For the handling of materials, the moisture content of wood materials is less than fifteen percent, then feed into the wood pellet making machine.
• Before the raw material are entered the wood pellet making machine, check the degree of dry and wet firstly, pay attention to the transportation and storage environment, if the moisture of the material is too high, it will stick to the inner part of the wood pellet making machine, agglomerate easily, will reduce the production value of the wood pellet making machine, therefore, when there is moisture, the raw materials should be exposed to the sun, after drying and disposal, then mash. All wearing parts of the pellet making machine have use cycle, it should be replaced after a period of use, the better the wear resistance of the wood pellet making machine, the greater the capacity of the pellet machine. If the fan is affected by voltage fluctuation, it should be checked emphatically.
• After the normal operation of the biomass wood pellet making machine, prevent the impurities mixed in the raw materials from entering the pellet making machine, such as the metal, brick, stone and so on. When the material and the machine are fully operational, begin to feed the wood raw materials. When feeding, the material should be fed evenly and smoothly, the power will play out, and it also prevents the phenomenon of clamping. About the machine lubrication, normally the host ground bearing per 12 hours plus a molybdenum disulfide grease, there are eight greasing points on the wood pellet making machine.
• The particle size can be adjusted according to the adjusting of valve position, the diameter of pellet should be checked in time. The amount of material will affect the milling, adhesions can affect the density, wood powder should be screened early, too large pellets will affect the output value. The wood pellet making machine can produce materials include wood, pine, poplar, fir, bamboo, and can also be used for grass, straw, corn stalk, sorghum stalk, and other fiber based raw materials.