Notes

What impact the molding result of biomass pellets?<br>
Biomass energy has several application settings, such as biogas, alcohol, and also biomass molding fuel. Biomass molding gas is the most practical and cost-effective mode. wood pellet production machine has biomass pellets and also biomass briquettes 2 kinds. Biomass pellets gradually replace briquettes owing to small dimension, high thickness, and also very easy usage.



Biomass briquettes as well as biomass pellets

Biomass pellets are made of timber pellet machine. It uses high pressure from roller as well as die to mold and mildew biomass products right into high-density strong pellets. The molding impact is affected by the basic material quality, molding process, as well as equipment efficiency. To enhance the molding impacts of biomass pellets, you must find out about the following aspects.



Raw material high quality

Resources structure

The raw materials for making wood pellets are made up of different contents. They have various reactions in high warmth and also high pressure. Some components like proteins and also lignin will certainly soften as well as have gluing effect. Some components like cellulose and inorganic particles are tough to break down or split. They impede the molding of wood pellets, but they takes up the most part of biomass products



The structure of raw materials has the largest impact on the pellet durability. The complying with graph shows the Pellet Top quality Coefficient (PQF) of a number of typical raw materials



The larger the PQF, the tighter the wood pellets are bound. Some products like bentonite, lignin have high PQF. They can function as binders. Some products like acid oil has reduced PQF, the particles inside can not bind together efficiently. Loose biomass pellets has less resilience. Only when the complete PQF of all products amount to more than 4.7, the wood pellets can take shape effectively.



The fineness of raw materials.

Basic material with smaller sized granularity have bigger surface, so they are very easy to bind. And the created pellets are a lot more compact and smooth, not easy to damage. pellet making machine for poultry feed , the higher the timber pellet stamina. However also little granulates calls for high energy intake for pulverizing. It is not advise to pursue as well tiny granulates.



The granulates ought to be consistent in dimension. Also huge granulates are hard to bind with others, as well as the surface area tend to be rough. Large fragments normally create radiant crack, where the timber pellets are easy to break. As well big granulates are tough to enter the die openings. They will certainly exacerbate the abrasion of pellet mill die as well as roller, decrease the wood pellet production, and reduced the molding price.



For that reason, the granularity of raw materials ought to be 1/2 -2/ 3 of the wood pellet dimension. You can embrace a screener with the pore diameter less than 10mm in crushing process, to ensure that the raw materials can fulfill the criterion for pelletizing and also blending, as well as lower the power consumption and also devices abrasion.



The wetness of raw materials.

The dampness in the biomass materials have lubrication function. They can decrease the friction in between the granulates, as well as boost their bonding. The wetness can additionally soften the materials so that they are less complicated to flaw as well as mold.



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



Molding process

The molding temperature

The biomass molding is to make the organic parts of biomass soften, bond as well as transformed under heat and also pressure.



Generally, the organic matters soften at the temperature of 70 ℃ ～ 80 ℃, bond at the temperature of 160 ℃, melt at the temperature level of 240 ℃. With the increase temperature level, the raw materials become much more soften, the liquidity increases, the resistance between basic materials decrease, so they are much easier to mold and mildew. As determined, the molding stress in heat is half of that in heat.



High temperature is not constantly great. Over-high temperature will trigger carbonization of the biomass materials. Such carbonization is neither consistent neither manageable, which will hinder molding and influence the wood pellet high quality.



The thickness of material layer

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




The density of product layer likewise affect the power usage of the pellet maker. When the material layer is thick, the extrusion stress will increase. With way too much basic materials entering the die holes, they will be also limited to discharge, as well as even cause damages to the tools. When the material layer is too slim, the extrusion stress is small, the raw materials pressed into the die openings want, so the timber pellet production is low.



The picture listed below programs the impact of resources on the extrusion pressure. B refers to appropriate thickness, A describes the layer is also thick, C describes the layer is too thin. In the A status, the extrusion force raise a great deal owing to the long squeezing area. In the C status, the extrusion pressure is as well tiny. So an ideal density is a property of high-efficient manufacturing.



Equipment performance

Extrusion speed

Extrusion speed identifies the time that raw materials remain in the die openings, so regarding influence the molding high quality. When the raw materials leave in the die openings for short time, the unit power intake is reduced, yet the timber pellets may be loose. When the raw products leave in the die openings for long, the wood pellets will have higher thickness and top quality, the system power consumption additionally enhance.



If the raw materials leave in the die holes for as well long, the rubbing will be expensive, the pellets will be also thick, the pellet device will be warm and also even stop.



The extrusion speed of a pellet maker is impacted by the roller size and rotating speed. An appropriate extrusion speed ensure the devices work continuously with low power intake.



Extrusion stamina

The squeezing stress on the raw products figures out the density of wood pellets. High pressure extrusion and also rubbing will certainly soften and also flaw the raw products and bind them together.



If the extrusion strength is insufficient, the raw materials can't be built efficiently. If the extrusion toughness is too expensive, it will certainly exacerbate the abrasion of dies and also add to cost.




The specifications of die hole

The parameters of die openings are limited by resources granularity, extrusion rate, squeezing out strength. Oppositely, the criteria of die holes influence the molding of wood pellets.



Pellet mill die openings have certain compression proportion. High compression proportion increase the extrusion strength, lower the extrusion rate. They appropriate for the materials with reduced sticky force.



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



The criterion of die openings must be adjusted according to different products, so that you can get top notch wood pellets with low device power intake.


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