Notes

What affect the molding effect of biomass pellets?<br>
Biomass energy has numerous application settings, such as biogas, alcohol, as well as biomass molding fuel. Biomass molding gas is the most practical and cost-effective mode. Biomass molding gas has biomass pellets and biomass briquettes 2 forms. Biomass pellets progressively change briquettes owing to small dimension, high density, as well as simple usage.



Biomass briquettes and biomass pellets

Biomass pellets are made of wood pellet machine. It uses high pressure from roller and die to mold biomass products into high-density strong pellets. pellet making machine for poultry feed is affected by the resources high quality, molding process, and equipment efficiency. To improve the molding results of biomass pellets, you should learn more about the list below variables.



Resources high quality

Raw material structure

The raw materials for making wood pellets are composed of various components. They have different responses in high warm and high pressure. Some materials like proteins and also lignin will soften and have gluing impact. Some components like cellulose as well as inorganic fragments are tough to break down or split. They hinder the molding of timber pellets, however they occupies one of the most part of biomass products



The make-up of resources has the largest impact on the pellet resilience. The adhering to chart shows the Pellet Top quality Coefficient (PQF) of numerous typical basic materials



The larger the PQF, the tighter the timber pellets are bound. Some products like bentonite, lignin have high PQF. They can serve as binders. Some products like acid oil has low PQF, the bits inside can not bind together successfully. Loose biomass pellets has much less sturdiness. Only when the overall PQF of all materials add up to more than 4.7, the wood pellets can form successfully.



The fineness of basic materials.

Resources with smaller granularity have larger area, so they are very easy to bind. As well as the produced pellets are much more small and also smooth, challenging to break. The smaller the granulates, the higher the timber pellet stamina. Yet also small granulates calls for high power consumption for pulverizing. It is not suggest to go after too little granulates.



The granulates should be uniform in size. Too big granulates are challenging to bind with others, and also the surface have a tendency to be rough. Big bits generally cause radiant split, where the timber pellets are very easy to break. Also big granulates are difficult to enter the die holes. They will intensify the abrasion of pellet mill die and roller, reduce the timber pellet production, as well as lower the molding rate.



Consequently, the granularity of raw materials must be 1/2 -2/ 3 of the wood pellet dimension. You can take on a screener with the pore diameter less than 10mm in crushing procedure, to make sure that the raw materials can satisfy the standard for pelletizing and blending, and also decrease the power usage and also equipment abrasion.



The dampness of basic materials.

The dampness in the biomass products have lubrication feature. They can reduce the rubbing between the granulates, as well as enhance their bonding. The moisture can additionally soften the products to make sure that they are easier to warp and mold and mildew.



Biomass products varies in moisture web content, usually in between 8% -15%. The moisture is impacted by temperature level. For those materials with over-high moisture, we require to dry them prior to making pellets.



Molding process

The molding temperature level

The biomass molding is to make the natural parts of biomass soften, bond and also changed under heat and stress.



Generally, the raw materials soften at the temperature of 70 ℃ ～ 80 ℃, bond at the temperature of 160 ℃, melt at the temperature level of 240 ℃. With the boost temperature level, the raw products come to be a lot more soften, the liquidity raises, the resistance in between basic materials reduce, so they are much easier to mold. As determined, feed pellet machine price in high temperature is fifty percent of that in heat.



Heat is not constantly good. Over-high temperature will cause carbonization of the biomass products. Such carbonization is neither uniform nor controllable, which will certainly hinder molding and influence the timber pellet top quality.




The density of product layer

In pellet machines, there is a clearance in between the roller and also die, where the biomass products form a layer. The clearance can be changed from 0.1 mm to 0.3 mm. To produce small-size timber pellets, the clearance is small, and also the other way around.



The density of material layer additionally affect the power intake of the pellet machine. When the material layer is thick, the extrusion stress will boost. With way too much raw materials getting involved in the die holes, they will be as well limited to release, and also trigger damages to the devices. When the material layer is too thin, the extrusion pressure is little, the raw materials squeezed right into the die holes want, so the timber pellet manufacturing is low.



The picture listed below programs the influence of resources on the extrusion pressure. B describes appropriate thickness, A describes the layer is too thick, C describes the layer is too slim. In the A standing, the extrusion pressure increase a lot owing to the lengthy pressing area. In the C status, the extrusion pressure is as well tiny. So a suitable thickness is a property of high-efficient manufacturing.



Devices performance

Extrusion rate

Extrusion rate figures out the moment that resources remain in the die openings, so as to affect the molding high quality. When the raw products leave in the die holes for short time, the unit power intake is low, yet 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 as well as quality, the unit power usage also increase.



If the raw products leave in the die openings for as well long, the friction will be too high, the pellets will be also thick, the pellet maker will be warm and also quit.



The extrusion speed of a pellet machine is impacted by the roller diameter as well as rotating speed. A proper extrusion rate guarantee the devices work continually with low power usage.




Extrusion strength

The squeezing stress on the raw products identifies the thickness of wood pellets. High pressure extrusion and rubbing will certainly soften as well as warp the raw products and also bind them together.



If the extrusion stamina wants, the raw materials can't be formed successfully. If the extrusion toughness is too expensive, it will certainly worsen the abrasion of dies as well as include in cost.



The specifications of die opening

The criteria of die openings are restricted by raw material granularity, extrusion rate, extruding strength. Oppositely, the specifications of die openings influence the molding of timber pellets.



Pellet mill die openings have specific compression ratio. High compression proportion increase the extrusion stamina, reduced the extrusion speed. They are suitable for the materials with reduced adhesive pressure.



The hole access form affect the speed of resources getting involved in the die openings, as well as affect the density of basic materials.



The criterion of die holes should be readjusted according to various materials, so that you can get premium wood pellets with low unit power usage.


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