Notes

What affect the molding result of biomass pellets?<br>
Biomass energy has numerous application modes, such as biogas, alcohol, and also biomass molding gas. Biomass molding fuel is the most practical as well as economical mode. Biomass molding gas has biomass pellets and also biomass briquettes 2 types. Biomass pellets slowly change briquettes owing to little size, high thickness, as well as very easy use.



Biomass briquettes as well as biomass pellets

Biomass pellets are made of timber pellet device. It makes use of high pressure from roller and die to mold and mildew biomass products right into high-density solid pellets. The molding effect is influenced by the basic material quality, molding procedure, and also equipment performance. To improve the molding results of biomass pellets, you ought to find out about the list below factors.



Basic material top quality

Raw material make-up

The raw products for making timber pellets are composed of different components. They have various responses in high warm as well as high pressure. Some materials like healthy proteins as well as lignin will certainly soften as well as have gluing impact. Some components like cellulose and also not natural fragments are tough to break down or split. They prevent the molding of timber pellets, yet they uses up one of the most part of biomass materials



The make-up of raw materials has the largest impact on the pellet longevity. The following graph shows the Pellet High quality Coefficient (PQF) of a number of usual basic materials



The larger the PQF, the tighter the timber pellets are bound. Some materials like bentonite, lignin have high PQF. They can serve as binders. Some products like acid oil has low PQF, the particles inside can not bind with each other properly. Loosened biomass pellets has much less sturdiness. Just when the complete PQF of all materials amount to greater than 4.7, the timber pellets can take shape successfully.



The excellence of resources.

Basic material with smaller granularity have bigger surface area, so they are very easy to bind. As well as the produced pellets are more small and smooth, not easy to break. The smaller the granulates, the higher the wood pellet strength. Yet too tiny granulates calls for high energy intake for grating. It is not recommend to pursue too little granulates.



The granulates should be consistent in size. Too huge granulates are hard to bind with others, and also the surface area have a tendency to be harsh. Large particles normally cause glowing crack, where the wood pellets are very easy to damage. Too large granulates are hard to get into the die openings. They will aggravate the abrasion of pellet mill die as well as roller, decrease the timber pellet manufacturing, and also reduced the molding price.



Therefore, the granularity of basic materials need to be 1/2 -2/ 3 of the timber pellet size. You can adopt a screener with the pore diameter less than 10mm in pulverizing process, so that the raw products can meet the criterion for pelletizing and also blending, and minimize the power usage as well as equipment abrasion.



The wetness of raw materials.

The wetness in the biomass materials have lubrication feature. They can lower the friction between the granulates, as well as boost their bonding. The wetness can additionally soften the products so that they are much easier to deform and also mold and mildew.



Biomass materials differs in wetness web content, typically between 8% -15%. The moisture is influenced by temperature. For those materials with over-high dampness, we need to dry them prior to making pellets.



Molding process

The molding temperature

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



Usually, the organic matters soften at the temperature of 70 ℃ ～ 80 ℃, bond at the temperature level of 160 ℃, melt at the temperature level of 240 ℃. With the rise temperature level, the raw materials come to be a lot more soften, the liquidity raises, the resistance between resources decrease, so they are less complicated to mold. As measured, the molding pressure in high temperature is fifty percent of that in heat.



Heat is not always excellent. Over-high temperature will cause carbonization of the biomass materials. Such carbonization is neither consistent nor controlled, which will certainly prevent molding as well as influence the timber pellet top 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. The clearance can be readjusted from 0.1 mm to 0.3 mm. To create small-size wood pellets, the clearance is little, and vice versa.



The thickness of product layer likewise influence the power consumption of the pellet equipment. When https://richipelletplant.blog.fc2blog.us/blog-entry-66.html is thick, the extrusion pressure will boost. With way too much resources entering the die openings, they will certainly be also limited to discharge, and also trigger damage to the tools. When the material layer is as well slim, the extrusion stress is small, the raw products squeezed right into the die holes want, so the timber pellet manufacturing is low.



The picture listed below shows the impact of basic materials on the extrusion pressure. B refers to suitable density, A describes the layer is also thick, C describes the layer is too slim. In the A status, the extrusion pressure raise a lot owing to the lengthy squeezing area. In the C status, the extrusion pressure is as well tiny. So an ideal thickness is a property of high-efficient production.



Tools efficiency


Extrusion rate

Extrusion speed figures out the moment that basic materials remain in the die holes, so as to influence the molding high quality. When jones pellet machine leave in the die openings for short time, the unit power consumption is reduced, yet the timber pellets might hang. When the raw products leave in the die openings for long, the wood pellets will certainly have higher density as well as top quality, the unit power usage likewise raise.



If the raw materials leave in the die openings for too long, the rubbing will certainly be too high, the pellets will certainly be as well dense, the pellet equipment will certainly be hot as well as also stop.



The extrusion speed of a pellet machine is influenced by the roller diameter and rotating speed. A correct extrusion speed make certain the equipment job continuously with low power consumption.



Extrusion toughness

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



If the extrusion toughness wants, the raw products can't be formed successfully. If the extrusion strength is too high, it will certainly aggravate the abrasion of dies as well as include in cost.



The specifications of die opening

The specifications of die openings are restricted by basic material granularity, extrusion rate, extruding stamina. Oppositely, the specifications of die openings affect the molding of timber pellets.



Pellet mill die openings have certain compression proportion. High compression ratio boost the extrusion toughness, reduced the extrusion speed. They appropriate for the products with low sticky pressure.



The hole entry form influence the rate of raw materials getting involved in the die holes, and influence the density of resources.



The parameter of die holes must be changed according to different materials, so that you can get top notch timber pellets with reduced device power usage.

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