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What affect the molding effect of biomass pellets
What affect the molding result of biomass pellets?
Richi machinery has many application settings, such as biogas, alcohol, and also biomass molding gas. Biomass molding fuel is one of the most convenient and also economical mode. Biomass molding fuel has biomass pellets and biomass briquettes 2 types. Biomass pellets progressively change briquettes owing to little dimension, high thickness, and very easy usage.

Biomass briquettes and biomass pellets
Biomass pellets are made from timber pellet machine. It uses high pressure from roller and also die to mold and mildew biomass products right into high-density strong pellets. The molding impact is affected by the raw material high quality, molding process, and tools efficiency. To improve the molding impacts of biomass pellets, you ought to find out about the following factors.


Raw material quality
Basic material make-up
The raw materials for making wood pellets are composed of various materials. They have various reactions in high warmth as well as high pressure. Some components like healthy proteins and lignin will soften and also have gluing effect. Some materials like cellulose and also inorganic particles are hard to break down or split. They impede the molding of timber pellets, but they occupies one of the most part of biomass products

The structure of resources has the largest influence on the pellet resilience. The following graph reveals the Pellet Top quality Coefficient (PQF) of several typical resources

The larger the PQF, the tighter the timber pellets are bound. Some products like bentonite, lignin have high PQF. They can act as binders. Some products like acid oil has reduced PQF, the fragments inside can't bind together properly. Loose biomass pellets has much less longevity. Only when the total PQF of all products amount to more than 4.7, the timber pellets can take shape successfully.

The excellence of basic materials.
Raw materials with smaller granularity have bigger surface, so they are very easy to bind. And the produced pellets are much more small and also smooth, difficult to damage. The smaller the granulates, the greater the timber pellet toughness. Yet also little granulates requires high energy consumption for pulverizing. It is not suggest to seek as well small granulates.

The granulates need to be consistent in dimension. Also large granulates are challenging to bind with others, as well as the surface area have a tendency to be rough. Huge fragments generally trigger glowing split, where the wood pellets are simple to damage. Too huge granulates are tough to get involved in the die openings. They will certainly aggravate the abrasion of pellet mill die and roller, reduce the timber pellet manufacturing, as well as reduced the molding rate.

For that reason, the granularity of raw materials should be 1/2 -2/ 3 of the wood pellet size. You can adopt a screener with the pore size less than 10mm in pulverizing process, to ensure that the raw materials can fulfill the criterion for pelletizing and also blending, as well as minimize the power consumption and also tools abrasion.

The wetness of raw materials.
The wetness in the biomass materials have lubrication function. They can reduce the friction in between the granulates, as well as boost their bonding. wood pellet manufacturing equipment can likewise soften the products to ensure that they are simpler to flaw and mold and mildew.

Biomass products differs in moisture content, typically in between 8% -15%. The wetness is impacted by temperature. For those products with over-high wetness, we require to dry them before making pellets.

Molding procedure
The molding temperature
The biomass molding is to make the organic parts of biomass soften, bond as well as transformed under heat as well as pressure.

Normally, the raw materials soften at the temperature of 70 ℃ ～ 80 ℃, bond at the temperature level of 160 ℃, liquefy at the temperature of 240 ℃. With the boost temperature, the raw materials come to be a lot more soften, the liquidity raises, the resistance between raw materials reduce, so they are easier to mold. As gauged, the molding pressure in heat is half of that in heat.

High temperature is not always excellent. Over-high temperature will certainly trigger carbonization of the biomass products. Such carbonization is neither consistent nor controllable, which will impede molding as well as impact the wood pellet high quality.

The density of product layer
In pellet makers, there is a clearance in between the roller and die, where the biomass materials develop a layer. The clearance can be adjusted from 0.1 mm to 0.3 mm. To generate small-size wood pellets, the clearance is tiny, and also the other way around.

The density of product layer also influence the power consumption of the pellet machine. When the material layer is thick, the extrusion stress will certainly raise. With way too much resources getting involved in the die holes, they will certainly be too limited to discharge, and also even trigger damage to the equipment. When the product layer is also thin, the extrusion pressure is tiny, the raw products squeezed into the die holes want, so the wood pellet manufacturing is low.

The picture listed below programs the influence of raw materials on the extrusion pressure. B refers to ideal density, A describes the layer is also thick, C refers to the layer is also thin. In the A status, the extrusion pressure increase a great deal owing to the long squeezing area. In the C status, the extrusion pressure is also tiny. So an appropriate density is a property of high-efficient manufacturing.

Tools performance
Extrusion speed
Extrusion speed identifies the time that basic materials remain in the die openings, so regarding influence the molding quality. When the raw products leave in the die openings for short time, the system power usage is low, yet the wood pellets may hang. When the raw materials leave in the die openings for long, the wood pellets will certainly have greater density and also top quality, the unit power intake additionally increase.

If the raw products leave in the die holes for as well long, the friction will be expensive, the pellets will certainly be too thick, the pellet device will certainly be warm as well as even stop.

The extrusion speed of a pellet equipment is impacted by the roller size as well as revolving speed. A correct extrusion rate make certain the equipment job continuously with low power intake.

Extrusion toughness

The pressing stress on the raw materials determines the density of timber pellets. High pressure extrusion as well as friction will certainly soften and also flaw the raw products and also bind them with each other.

If the extrusion strength wants, the raw products can't be built effectively. If the extrusion strength is too expensive, it will certainly worsen the abrasion of dies and add to cost.

The specifications of die hole
The criteria of die holes are restricted by raw material granularity, extrusion speed, extruding toughness. Oppositely, the specifications of die openings affect the molding of wood pellets.

Pellet mill die holes have particular compression proportion. High compression proportion boost the extrusion stamina, reduced the extrusion speed. They are suitable for the materials with reduced sticky pressure.

The hole entry shape affect the speed of raw materials getting into the die openings, and influence the density of resources.

The specification of die openings need to be changed according to different materials, to ensure that you can obtain high-quality timber pellets with reduced unit power consumption.


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