Notes

What affect the molding result of biomass pellets?<br>
Biomass power has many application modes, such as biogas, alcohol, as well as biomass molding gas. Biomass molding fuel is the most hassle-free as well as affordable mode. Biomass molding fuel has biomass pellets as well as biomass briquettes 2 types. Biomass pellets slowly change briquettes owing to little size, high density, as well as very easy use.



Biomass briquettes and also biomass pellets

Biomass pellets are constructed from wood pellet maker. It makes use of high pressure from roller and also die to mold and mildew biomass products right into high-density strong pellets. The molding result is influenced by the raw material quality, molding process, and also devices performance. To boost the molding impacts of biomass pellets, you ought to learn more about the list below aspects.



Resources quality

Raw material make-up

The raw materials for making wood pellets are made up of various components. They have various responses in high warmth and high pressure. Some components like proteins as well as lignin will soften and have gluing result. Some contents like cellulose as well as not natural particles are tough to break down or split. They hinder the molding of wood pellets, however they occupies one of the most part of biomass materials



The structure of basic materials has the largest influence on the pellet sturdiness. The following graph reveals the Pellet Quality Coefficient (PQF) of a number of common resources



The larger the PQF, the tighter the wood 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 with each other efficiently. Loosened used pellet machine for sale has much less resilience. Only when the overall PQF of all materials amount to greater than 4.7, the timber pellets can form successfully.



The excellence of raw materials.

Raw materials with smaller granularity have bigger surface area, so they are easy to bind. And hardwood pellet mill produced pellets are extra portable and also smooth, difficult to break. rice husk pellet machine , the higher the timber pellet toughness. Yet as well little granulates needs high energy intake for grating. It is not suggest to pursue as well tiny granulates.



The granulates need to be uniform in size. Too big granulates are not easy to bind with others, as well as the surface area often tend to be harsh. Big particles normally cause glowing fracture, where the timber pellets are easy to break. As well huge granulates are tough to enter into the die holes. They will certainly worsen the abrasion of pellet mill die and also roller, minimize the timber pellet manufacturing, and reduced the molding price.



As a result, the granularity of basic materials must be 1/2 -2/ 3 of the timber pellet size. You can embrace a screener with the pore size less than 10mm in crushing procedure, so that the raw products can satisfy the requirement for pelletizing and blending, and also decrease the power consumption and tools abrasion.



The wetness of resources.

The moisture in the biomass materials have lubrication feature. They can reduce the rubbing between the granulates, and also improve their bonding. The wetness can additionally soften the materials to ensure that they are less complicated to deform as well as mold and mildew.



Biomass materials varies in wetness material, usually between 8% -15%. The dampness is affected by temperature level. For those materials with over-high moisture, we need to dry them before making pellets.



Molding procedure

The molding temperature level

The biomass molding is to make the natural parts of biomass soften, bond and changed under high temperature as well as pressure.



Typically, the raw materials soften at the temperature level of 70 ℃ ～ 80 ℃, bond at the temperature of 160 ℃, liquefy at the temperature of 240 ℃. With the boost temperature, the raw materials become more soften, the liquidity increases, the resistance between basic materials reduce, so they are simpler to mold. As gauged, the molding pressure in high temperature is half of that in high temperature.



High temperature is not always great. Over-high temperature will certainly cause carbonization of the biomass products. Such carbonization is neither uniform nor controllable, which will certainly impede molding and affect the wood pellet top quality.



The density of material layer

In pellet machines, there is a clearance in between the roller and die, where the biomass materials form a layer. The clearance can be changed from 0.1 mm to 0.3 mm. To generate small-size wood pellets, the clearance is tiny, as well as the other way around.




The density of material layer also influence the power consumption of the pellet device. When the product layer is thick, the extrusion pressure will certainly increase. With too much raw materials getting involved in the die holes, they will be also tight to release, and even create damage to the devices. When the product layer is too slim, the extrusion pressure is tiny, the raw products squeezed into the die openings want, so the timber pellet manufacturing is reduced.



The picture listed below programs the influence of resources on the extrusion force. B refers to suitable density, A describes the layer is as well thick, C refers to the layer is also slim. In the A standing, the extrusion pressure enhance a lot owing to the lengthy pressing location. In the C condition, the extrusion pressure is also tiny. So an ideal thickness is a premise of high-efficient manufacturing.



Equipment efficiency

Extrusion rate

Extrusion speed establishes the moment that raw materials are in the die holes, so regarding influence the molding high quality. When the raw materials leave in the die holes for short time, the device power intake is reduced, but the wood pellets may hang. When the raw materials leave in the die holes for long, the wood pellets will have higher thickness and also top quality, the device power usage also enhance.



If the raw materials leave in the die openings for too long, the friction will certainly be expensive, the pellets will certainly be as well dense, the pellet maker will certainly be warm as well as even stop.



The extrusion speed of a pellet equipment is affected by the roller diameter and also rotating speed. A proper extrusion rate ensure the devices work constantly with low power intake.




Extrusion toughness

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



If the extrusion toughness wants, the raw materials can not be formed successfully. If the extrusion stamina is too expensive, it will exacerbate the abrasion of dies as well as include in set you back.



The parameters of die opening

The criteria of die openings are limited by basic material granularity, extrusion rate, squeezing out toughness. Oppositely, the parameters of die holes affect the molding of wood pellets.



Pellet mill die openings have certain compression proportion. High compression ratio increase the extrusion stamina, lower the extrusion rate. They are suitable for the products with reduced adhesive force.



The hole entry form influence the speed of resources getting into the die openings, as well as influence the density of resources.



The criterion of die holes ought to be readjusted according to different products, to make sure that you can obtain high-quality timber pellets with reduced unit power intake.


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