Notes

What influence the molding result of biomass pellets?<br>
pellet machine for sale has lots of application settings, such as biogas, alcohol, as well as biomass molding gas. Biomass molding gas is the most practical as well as cost-effective mode. Biomass molding fuel has biomass pellets and biomass briquettes 2 types. Biomass pellets slowly replace briquettes owing to small size, high thickness, as well as very easy usage.



Biomass briquettes and also biomass pellets


Biomass pellets are constructed from wood pellet machine. It uses high pressure from roller as well as die to mold and mildew biomass materials right into high-density strong pellets. The molding impact is influenced by the raw material quality, molding procedure, and also devices efficiency. To boost the molding results of biomass pellets, you must discover the following aspects.



Basic material quality

Basic material structure

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



The make-up of resources has the largest influence on the pellet sturdiness. The adhering to chart reveals the Pellet Quality Coefficient (PQF) of numerous typical basic materials



The bigger 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 fragments inside can not bind with each other successfully. Loosened biomass pellets has much less durability. Only when the complete PQF of all products add up to more than 4.7, the timber pellets can materialize effectively.



The fineness of raw materials.

Raw materials with smaller sized granularity have larger surface area, so they are very easy to bind. As well as the created pellets are extra small as well as smooth, challenging to damage. The smaller sized the granulates, the greater the timber pellet toughness. But as well small granulates requires high energy usage for pulverizing. It is not advise to pursue too tiny granulates.



The granulates ought to be consistent in dimension. As well big granulates are challenging to bind with others, as well as the surface often tend to be rough. Huge fragments usually cause glowing split, where the timber pellets are easy to damage. As well huge granulates are tough to get into the die openings. They will aggravate the abrasion of pellet mill die and roller, lower the wood pellet production, as well as lower the molding rate.



As a result, the granularity of raw materials need to be 1/2 -2/ 3 of the timber pellet dimension. You can embrace a screener with the pore size less than 10mm in pulverizing process, so that the raw products can meet the criterion for pelletizing as well as mixing, and also lower the power intake and tools abrasion.



The dampness of raw materials.

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



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



Molding procedure

The molding temperature

The biomass molding is to make the organic parts of biomass soften, bond as well as changed under high temperature as well as stress.



Usually, the organic matters soften at the temperature of 70 ℃ ～ 80 ℃, bond at the temperature of 160 ℃, dissolve at the temperature of 240 ℃. With the boost temperature level, the raw products become more soften, the liquidity increases, the resistance in between resources lower, so they are easier to mold. As measured, the molding pressure in high temperature is fifty percent of that in heat.



High temperature is not constantly great. Over-high temperature will certainly create carbonization of the biomass materials. Such carbonization is neither uniform nor controlled, which will certainly hinder molding as well as influence the timber pellet top quality.



The density of product layer

In pellet equipments, there is a clearance between the roller and die, where the biomass products create 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, and also vice versa.



The thickness of material layer also affect the power usage of the pellet maker. When the material layer is thick, the extrusion stress will boost. With too much raw materials entering into the die holes, they will certainly be as well limited to release, as well as even trigger damage to the devices. When the material layer is also thin, the extrusion stress is little, the raw materials pressed right into the die openings are insufficient, so the wood pellet production is reduced.



The picture below shows the influence of basic materials on the extrusion pressure. B describes appropriate thickness, A refers to the layer is too thick, C refers to the layer is as well slim. In the A status, the extrusion force enhance a great deal owing to the lengthy pressing location. In the C condition, the extrusion pressure is also small. So an ideal thickness is a facility of high-efficient production.



Tools efficiency

Extrusion rate

Extrusion speed identifies the time that resources are in the die holes, so as to influence the molding quality. When the raw materials leave in the die openings for short time, the unit power usage is reduced, but the wood pellets may be loose. When the raw materials leave in the die openings for long, the wood pellets will certainly have greater density and high quality, the device power consumption also boost.



If the raw products leave in the die openings for too long, the rubbing will be expensive, the pellets will be also dense, the pellet equipment will certainly be warm and also even stop.



The extrusion rate of a pellet machine is affected by the roller diameter and revolving speed. A proper extrusion speed ensure the equipment work continually with low power usage.



Extrusion strength

The squeezing stress on the raw materials figures out the thickness of timber pellets. High pressure extrusion and rubbing will certainly soften and deform the raw materials and bind them with each other.



If the extrusion strength is insufficient, the raw materials can not be built successfully. If the extrusion toughness is too expensive, it will certainly exacerbate the abrasion of dies as well as contribute to cost.



The criteria of die hole

The specifications of die holes are limited by resources granularity, extrusion rate, extruding strength. Oppositely, look at these guys of die openings affect the molding of timber pellets.



Pellet mill die holes have certain compression ratio. High compression ratio increase the extrusion stamina, lower the extrusion rate. They appropriate for the products with low adhesive pressure.



The hole entrance shape influence the speed of basic materials entering the die openings, and affect the density of raw materials.



The parameter of die openings should be adjusted according to different products, so that you can obtain top notch timber pellets with low unit power intake.

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