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What affect the molding effect of biomass pellets
What impact the molding impact of biomass pellets?
Biomass energy has many application modes, such as biogas, alcohol, as well as biomass molding fuel. Biomass molding fuel is one of the most hassle-free as well as economical setting. Biomass molding fuel has biomass pellets and biomass briquettes 2 forms. Biomass pellets gradually replace briquettes owing to tiny size, high thickness, and also very easy use.

Biomass briquettes and also biomass pellets
Biomass pellets are made from wood 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 influenced by the raw material quality, molding procedure, as well as tools performance. To improve the molding results of biomass pellets, you need to discover the following variables.

Resources top quality
Basic material make-up
The raw products for making timber pellets are made up of different contents. They have different reactions in high warm and high pressure. Some contents like proteins and also lignin will certainly soften and have gluing effect. Some components like cellulose as well as not natural fragments are difficult to break down or split. They hinder the molding of timber pellets, but they takes up one of the most part of biomass materials


The composition of basic materials has the largest impact on the pellet toughness. The adhering to graph shows the Pellet Quality Coefficient (PQF) of numerous common resources

The larger the PQF, the tighter the wood pellets are bound. Some products like bentonite, lignin have high PQF. They can work as binders. Some materials like acid oil has low PQF, the bits inside can't bind together properly. Loose biomass pellets has less sturdiness. Just when the total PQF of all products amount to greater than 4.7, the wood pellets can materialize successfully.

The fineness of resources.
Resources with smaller granularity have bigger area, so they are simple to bind. And the generated pellets are extra small and also smooth, not easy to damage. The smaller sized the granulates, the higher the timber pellet stamina. But as well small granulates needs high power intake for grating. It is not suggest to seek also small granulates.

The granulates ought to be uniform in size. As well large granulates are not easy to bind with others, as well as the surface area tend to be harsh. Big bits generally create glowing split, where the wood pellets are simple to damage. As well huge granulates are tough to enter into the die holes. They will certainly aggravate the abrasion of pellet mill die as well as roller, minimize the timber pellet production, as well as reduced the molding rate.

For that reason, the granularity of resources must be 1/2 -2/ 3 of the timber pellet dimension. You can take on a screener with the pore diameter less than 10mm in shattering process, so that the raw products can meet the requirement for pelletizing and also mixing, and reduce the power consumption as well as equipment abrasion.

The dampness of resources.
The moisture in the biomass products have lubrication function. They can decrease the friction in between the granulates, as well as improve their bonding. The wetness can likewise soften the products so that they are simpler to warp and also mold and mildew.

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

Molding procedure
The molding temperature
The biomass molding is to make the organic parts of biomass soften, bond and transformed under heat and also 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 rise temperature level, the raw products end up being more soften, the liquidity raises, the resistance between raw materials lower, so they are much easier to mold and mildew. As measured, the molding pressure in heat is fifty percent of that in high temperature.

Heat is not constantly excellent. Over-high temperature will cause carbonization of the biomass products. Such carbonization is neither uniform neither manageable, which will certainly hinder molding as well as impact the wood pellet high quality.

The density of product layer
In pellet devices, there is a clearance in between the roller and also die, where the biomass products form 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, as well as vice versa.


The density of product layer also affect the power usage of the pellet device. When the product layer is thick, the extrusion stress will certainly boost. With excessive raw materials getting into the die openings, they will be too limited to discharge, and even cause damages to the tools. When the material layer is too thin, the extrusion stress is small, the raw products squeezed right into the die holes are insufficient, so the timber pellet manufacturing is reduced.

The picture listed below shows the influence of raw materials on the extrusion pressure. B describes suitable density, A describes the layer is too thick, C describes the layer is too slim. In the A condition, the extrusion pressure raise a whole lot owing to the long squeezing location. In the C standing, the extrusion force is too small. So an ideal density is a property of high-efficient manufacturing.

commercial pellet mill establishes the time that raw materials remain in the die holes, so as to impact the molding quality. When the raw products leave in the die openings for short time, the device power intake is low, yet the timber pellets may hang. When the raw materials leave in the die openings for long, the wood pellets will have higher thickness and also quality, the device power usage additionally increase.

If the raw materials leave in the die openings for also long, the rubbing will certainly be expensive, the pellets will certainly be also dense, the pellet device will certainly be hot and also also stop.

The extrusion rate of a pellet device is influenced by the roller diameter and also rotating rate. A correct extrusion rate make certain the equipment job constantly with reduced power consumption.

richi pellet mill squeezing pressure on the raw products figures out the density of timber pellets. High pressure extrusion and also rubbing will certainly soften as well as warp the raw materials and also bind them together.

If the extrusion strength is insufficient, the raw products can not be built successfully. If the extrusion strength is expensive, it will certainly aggravate the abrasion of dies and include in cost.

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

Pellet mill die holes have particular compression proportion. High compression ratio enhance the extrusion strength, reduced the extrusion speed. They are suitable for the materials with reduced sticky force.

The hole entrance shape influence the rate of raw materials entering the die openings, and also influence the density of raw materials.

The parameter of die openings need to be changed according to different products, to ensure that you can get premium wood pellets with low system power usage.


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