Today, the need for renewable energy sources is clear. Our dependence on fossil fuels is no longer sustainable or affordable. There is a limited resource of fossil fuels, plus as the global population continues to enlarge at an accelerating rate, those supplies cannot meet the demands of a growing population. Also, fossil fuels are now known to be a key contributor to climate change plus carbon emissions. Therefore the require for alternative energy sources such as biomass is driven on fuel resource, price as well as environmental concerns. The issue is how do we capture the energy from wood. Wood in its organic form is not an ideal fuel source. Wood generally has a low bulk density and therefore also a low fuel density. Also the moisture content of raw wood is generally too high to provide proficient burning. Therefore the biomass requires processing into a more useable form of energy. Pellets are part of that biomass solution.
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As discussed, biomass in its raw form is not ideal as an fuel source due to its low density along with high moisture content. One of the simplest ways to turn biomass into a highly efficient as well as cheap form of energy is to compress the biomass material into pellets. Pellets are in the shape of small cylinders, which for fuel pellets are usually 6 or 8mm in diameter. Pellets have a much higher bulk and fuel density compared to the raw material as well as also a much lower moisture content below 10%. This enables the pellets to burn much more efficiently than raw wood. There are also developments to make wood pellets even more efficient, plus have a higher fuel density. One interesting practice is torrefaction. Torrefaction is where the biomass is heated to between 200 as well as 300 degrees, plus a lot of the unwanted volatiles which reduce burning efficiency are burnt off. What is left is a much purer form of carbon which not only burns much more more efficiently than standard biomass and wood pellets, it also have quite a lot of extra benefits. This payback include being hydrophobic, which means the pellets are not susceptible to moisture as fuel pellets at this time are. Torrefied biomass in addition to wood pellets are gaining ground, in addition to are the future.
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Converting biomass fuel into pellets brings dwelling heating by solid biomass energy away from high maintenance log stoves into the 21st century. Modern pellet stoves along with boilers have various automated features which lessen the work load of the owner. For case energy hoppers on pellet burners usually hold at least a days worth of fuel. On the other hand some have large external hoppers which hold a years resource. Owing to the demand for fuel from biomass along with a greater demand for pellets, interest in pellet production has also grown significantly. Producing quality fuel pellets requires quite a lot of pieces of tools from chippers, hammer mills, dryers in addition to pellets mills also known as pellet machines along with pellet press. Operating this apparatus requires a definite knowledge of what each material requires to produce quality pellets.
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