Notes

What affect the molding effect of biomass pellets
What affect the molding result of biomass pellets?
Biomass energy has lots of application modes, such as biogas, alcohol, as well as biomass molding fuel. Biomass molding gas is one of the most convenient and affordable mode. Biomass molding fuel has biomass pellets and biomass briquettes 2 kinds. Biomass pellets slowly replace briquettes owing to small dimension, high density, and easy usage.

Biomass briquettes as well as biomass pellets
Biomass pellets are made of wood pellet maker. It makes use of high pressure from roller and also die to mold and mildew biomass materials right into high-density strong pellets. The molding result is influenced by the raw material quality, molding procedure, and also devices performance. To boost the molding results of biomass pellets, you must find out about the following aspects.

Resources top quality
Resources make-up

The raw products for making wood pellets are made up of various contents. They have various reactions in high warmth and also high pressure. Some materials like healthy proteins and lignin will certainly soften and also have gluing impact. Some components like cellulose and not natural fragments are difficult to break down or split. They prevent the molding of timber pellets, however they occupies the most part of biomass materials


The make-up of resources has the biggest impact on the pellet longevity. The complying with chart shows the Pellet Quality Coefficient (PQF) of several usual basic materials

The bigger 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 bits inside can't bind together properly. Loosened biomass pellets has much less longevity. Only when the overall PQF of all materials amount to more than 4.7, the wood pellets can take shape efficiently.

The fineness of basic materials.
Resources with smaller granularity have larger surface area, so they are easy to bind. And also the produced pellets are extra portable as well as smooth, not easy to break. The smaller the granulates, the greater the timber pellet stamina. Yet too small granulates requires high power usage for grating. It is not suggest to pursue too tiny granulates.

The granulates need to be uniform in size. Also huge granulates are difficult to bind with others, as well as the surface have a tendency to be rough. Large fragments generally create radiant split, where the wood pellets are easy to damage. Also big granulates are difficult to enter the die openings. They will certainly aggravate the abrasion of pellet mill die as well as roller, reduce the timber pellet manufacturing, and lower the molding price.

Therefore, the granularity of basic materials 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 pulverizing process, to make sure that the raw materials can meet the standard for pelletizing and mixing, and also decrease the power consumption and equipment abrasion.

The wetness of basic materials.
The dampness in the biomass products have lubrication function. They can minimize the friction in between the granulates, and improve their bonding. The moisture can additionally soften the products so that they are simpler to flaw as well as mold and mildew.

Biomass materials differs in dampness web content, normally between 8% -15%. The moisture is affected by temperature level. 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 as well as changed under high temperature as well as stress.

Usually, the raw materials soften at the temperature level of 70 ℃ ～ 80 ℃, bond at the temperature level of 160 ℃, melt at the temperature of 240 ℃. With the boost temperature level, the raw products become a lot more soften, the liquidity increases, the resistance between resources lower, so they are simpler to mold. As measured, the molding stress in heat is fifty percent of that in heat.

Heat is not always good. Over-high temperature level will create carbonization of the biomass products. Such carbonization is neither consistent nor controllable, which will certainly hinder molding and impact the timber pellet quality.

The density of product layer
In pellet machines, there is a clearance between the roller and also die, where the biomass materials form a layer. pellet mill near me can be readjusted 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 thickness of material layer likewise affect the power intake of the pellet machine. When the product layer is thick, the extrusion stress will raise. With excessive resources entering into the die holes, they will certainly be as well limited to release, and also even trigger damages to the devices. When the material layer is too slim, the extrusion pressure is tiny, the raw materials squeezed right into the die holes are insufficient, so the wood pellet production is low.

The picture below programs the impact of resources on the extrusion force. B refers to ideal thickness, A describes the layer is also thick, C describes the layer is too thin. In the A status, the extrusion force enhance a great deal owing to the lengthy pressing area. In the C condition, the extrusion force is also tiny. So an ideal thickness is a facility of high-efficient manufacturing.

Devices performance
Extrusion rate
Extrusion speed determines the time that raw materials are in the die holes, so regarding influence the molding quality. When charcoal coal big pellet making machine leave in the die openings for short time, the unit power usage is reduced, but the wood pellets may hang. When the raw products leave in the die openings for long, the wood pellets will have greater density as well as high quality, the system power usage likewise enhance.

If the raw materials leave in the die openings for as well long, the friction will be expensive, the pellets will be too thick, the pellet machine will certainly be warm and also quit.

The extrusion rate of a pellet equipment is impacted by the roller size as well as revolving rate. A proper extrusion speed guarantee the devices job continuously with reduced power intake.

Extrusion stamina
The squeezing stress on the raw materials figures out the density of timber pellets. High pressure extrusion and also rubbing will certainly soften as well as flaw the raw products and bind them with each other.

If the extrusion stamina is insufficient, the raw products can't be molded successfully. If the extrusion strength is expensive, it will certainly intensify the abrasion of dies as well as add to cost.

The specifications of die opening
The criteria of die holes are restricted by basic material granularity, extrusion speed, extruding toughness. Oppositely, the criteria of die openings influence the molding of timber pellets.

Pellet mill die holes have certain compression proportion. High compression ratio increase the extrusion stamina, reduced the extrusion speed. They are suitable for the products with reduced sticky pressure.

The hole access shape affect the rate of basic materials entering the die holes, and also influence the density of resources.

The criterion of die openings need to be readjusted according to different materials, to ensure that you can obtain top quality timber pellets with reduced device power usage.


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