Notes

What affect the molding effect of biomass pellets
What influence the molding impact of biomass pellets?
Biomass power has lots of application modes, such as biogas, alcohol, and biomass molding fuel. Biomass molding fuel is the most practical as well as economical setting. Biomass molding fuel has biomass pellets and also biomass briquettes 2 types. Biomass pellets progressively replace briquettes owing to little size, high thickness, and also easy use.

Biomass briquettes as well as biomass pellets
Biomass pellets are constructed from timber pellet machine. It makes use of high pressure from roller and also die to mold biomass materials into high-density strong pellets. The molding effect is affected by the resources quality, molding procedure, as well as equipment efficiency. To boost the molding results of biomass pellets, you need to find out about the following variables.

Resources quality
Raw material structure
The raw products for making timber pellets are made up of various materials. They have different reactions in high warmth and high pressure. Some components like healthy proteins as well as lignin will certainly soften and also have gluing impact. Some components like cellulose and also inorganic particles are difficult to break down or split. They hinder the molding of timber pellets, however they occupies the most part of biomass products

The make-up of resources has the largest influence on the pellet longevity. The complying with chart shows the Pellet Top quality Coefficient (PQF) of a number of common raw materials

The larger the PQF, the tighter the timber pellets are bound. Some products like bentonite, lignin have high PQF. They can work as binders. Some products like acid oil has low PQF, the particles inside can not bind with each other efficiently. Loosened biomass pellets has much less longevity. Only when the complete PQF of all materials add up to more than 4.7, the wood pellets can materialize effectively.

The fineness of resources.
Raw materials with smaller granularity have bigger surface, so they are easy to bind. And also the generated pellets are more small and smooth, challenging to damage. The smaller sized the granulates, the higher the wood pellet stamina. But also tiny granulates requires high energy consumption for grating. It is not recommend to seek as well tiny granulates.

The granulates must be uniform in size. As well large granulates are hard to bind with others, and the surface area tend to be harsh. Large bits typically cause radiant fracture, where the timber pellets are easy to damage. Also large granulates are difficult to get into the die openings. They will certainly aggravate the abrasion of pellet mill die as well as roller, minimize the wood pellet manufacturing, and also lower the molding price.

For that reason, the granularity of raw materials ought to be 1/2 -2/ 3 of the timber pellet dimension. You can adopt a screener with the pore diameter less than 10mm in crushing procedure, to ensure that the raw products can satisfy the standard for pelletizing and mixing, and also lower the power consumption and also tools abrasion.

The moisture of resources.
The moisture in the biomass products have lubrication feature. They can decrease the friction between the granulates, and also improve their bonding. The dampness can likewise soften the products to ensure that they are easier to flaw and also mold and mildew.


Biomass products differs in dampness web content, typically between 8% -15%. The wetness is affected by temperature. For those materials with over-high dampness, we need to dry them before making pellets.

Molding procedure
The molding temperature
The biomass molding is to make the natural parts of biomass soften, bond and also transformed under high temperature and also pressure.


Typically, the organic matters soften at the temperature level of 70 ℃ ～ 80 ℃, bond at the temperature of 160 ℃, dissolve at the temperature level of 240 ℃. With the increase temperature, the raw materials come to be a lot more soften, the liquidity boosts, the resistance in between raw materials lower, so they are easier to mold and mildew. As gauged, the molding pressure in high temperature is fifty percent of that in heat.

Heat is not always excellent. Over-high temperature level will certainly trigger carbonization of the biomass materials. Such carbonization is neither uniform nor manageable, which will certainly impede molding and influence the timber pellet high quality.

The density of material layer
In pellet machines, there is a clearance between the roller and also die, where the biomass materials create a layer. The clearance can be readjusted from 0.1 mm to 0.3 mm. To produce small-size timber pellets, the clearance is small, as well as the other way around.

The thickness of material layer additionally affect the power consumption of the pellet maker. When home wood pellet machine is thick, the extrusion stress will increase. With excessive basic materials entering the die openings, they will certainly be also limited to discharge, and even trigger damages to the equipment. When the material layer is as well thin, the extrusion stress is tiny, the raw materials pressed right into the die openings are insufficient, so the wood pellet manufacturing is low.

The picture listed below shows the influence of resources on the extrusion force. B describes appropriate density, A refers to the layer is also thick, C refers to the layer is as well slim. In the A status, the extrusion pressure increase a whole lot owing to the long pressing location. In the C standing, the extrusion force is too tiny. So an ideal density is a premise of high-efficient production.

Equipment efficiency
Extrusion speed
Extrusion speed establishes the time that raw materials remain in the die holes, so regarding impact the molding quality. When the raw materials leave in the die holes for short time, the system power consumption is reduced, however the wood pellets might be loose. When the raw materials leave in the die openings for long, the timber pellets will certainly have greater density and also top quality, the device power intake also boost.

If used pellet mill equipment leave in the die holes for as well long, the friction will be too expensive, the pellets will be also thick, the pellet equipment will certainly be hot as well as even quit.

The extrusion rate of a pellet maker is impacted by the roller diameter as well as rotating speed. An appropriate extrusion rate make sure the equipment job continuously with reduced power usage.

Extrusion stamina
The pressing stress on the raw products determines the thickness of wood pellets. High pressure extrusion as well as friction will soften and flaw the raw materials as well as bind them together.

If the extrusion toughness is insufficient, the raw products can not be molded effectively. If the extrusion stamina is expensive, it will aggravate the abrasion of dies and also add to set you back.

The parameters of die opening
The criteria of die openings are limited by raw material granularity, extrusion rate, extruding toughness. Oppositely, the criteria of die openings affect the molding of timber pellets.

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

The hole entry form affect the rate of basic materials entering the die holes, and also influence the thickness of raw materials.

The specification of die holes should be readjusted according to different materials, so that you can get top quality wood pellets with low unit power intake.


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