As biomass energy is widely accepted as the alternative fuel for fossil fuel, more and more people are eager to invest in the biomass pellet production business. Although the bright prospect for the biomass pellet is undeniable, and the raw material is low-cost and affluent, there are still some risks which you have to take preliminary steps to cope with.
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Many people would consider that in the process of pellet production, the less the water, the better the pellet quality could be. However, this is not always the case. Water is still an indispensable component in the production of pellets. Only in appropriate proportion, can water comes into play to the largest extent.
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In the pellet fuel market of Europe and USA, there exists several industrial standards. If you are going to sell your pellet products to the market there, then you should study their standards in advance. Otherwise, your products may be unwelcomed for not meeting their standard. However, in a general sense, the quality of the pellets are often judged on two aspects–mechanical durability and moisture content.
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In the pellet production, the part of raw material particles which are not stuck together to be granulated is called fines. It is internationally recognized that the fine percent of qualified biomass pellets should be lower than 1%. Inadequate pressure inside the pelletizer and insufficient binder is the main causes results in higher percentage of fines. Additionally, if the pellets are not mechanically strong enough, it will easily shatter into fines in the process of delivering or crushing with other pellets. That is to say, the fines percentage of the biomass pellets is an evidence to examine the capability of the pellet machines and the pellet quality.
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To make good-quality pellets, the moisture content of the raw material plays an important role in the pelletizing process. Usually speaking, the moisture content ranges at 10-20% is the basic standard at producing qualified pellets. The optimum level is at appropriate 15%. Therefore, to control the moisture content, we need the help from dryer machine.
Rotary/Drum Dryers
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As the winter is approaching, we need to store large amounts of pellet fuel for heating to get warm. No matter we pack it by ourself or purchase it from shops, we need to attach great importance to its package. Good package can protect the pellets from getting damp and breaking apart. Because if the wood pellets are exposed in the humid environment, they will absorb the water, and then get swell, which severely impact on its combustion efficiency in the pellet stove, even though the pellet fuel is produced by the best pellet mill. The most widely-used packaging solutions are bags, sacks and pellet tankers.
Bags
The most common package way is using plastic bags, each can contain 10-20Kg pellets, which is convenient for customers to load into the pellet stove or pellet boiler. The bags are usually made by many layers of plastic clothes with two end seaming. Bags are mainly used by small-scale pellet consumer.
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