Fuels - Uses and Qualities
Heating In & Out, Cooking & Grilling
TidyFire-burners smokelessly produce heat and blaze wherever you want them.
Use all-around in- and outdoors, thanks to their easy portabiity, for example in:
In addition to flexibly lending themselves for various in- and outdoor uses, they are clean and effective with many different solid biofuels.
Suitable fuels include pellets, briquettes, charcoal, biochar, biocoal, and wood chips, among others, as well as firewood with integrated hybrid burners.
The choice is yours, while TidyFire helps you keep a warm hearth and tidy home with good health.
Heating is certainly efficient and cooking healthy with TidyFire burners.
Biopellets - Pelletized Biomass
Tidy Living Space
Handling of biopellets is a lot more tidy and living-space-friendly than working with firewood or wood chips.
Biopellets are practically litter-free, especially when handled with TidyFire accessories.
This is only one of the reasons why biopellets are a preferable type of fuel for regular heating during the cold season.
Small Stogare Space and Ease of Storage
Storage space needed for pellets is always less than half of that required for firewood.
This is because there is typically 2.8-4.6 times more energy in a cubic meter of biopellets (2900-3400 kWh) than in one cubic meter pile of firewood (740-1040 kWh @ 20% moisture).
Firewood can be organized into neat stacks to reduce the required space, but it still needs about 2.5 times more space than wood pellets containing the same amount of energy.
Pellets need no organization as they are typically bought in bags or delivered in sacks.
Large quantities can be blown from a tanker directly to a purpose-built container or storage facility.
Ensure Cleanliness and Efficiency of Combustion
Pellets burn extremely clean due to their extra low moisture content.
Moreover, commercial quality pellets use only purified raw materials.
Wood pellets are highly affordable throughout the world and provide heat at a fraction of the cost of electricity.
For example in Europe, wood pellets are typically much cheaper than firewood, roughly three times cheaper than oil, and many times cheaper than electricity in terms of heating value.
Utmost Efficiency and Cleanliness
Wood pellets burn extremely efficiently and clean in TidyFire burners because of their purified raw material and extra-low moisture content.
Commercial quality wood pellets don't contain bark, which has a high ash content and low heating value.
Bark is also known to cause both small (sub-µm) and large (~5µm) particle emissions in typical household furnaces/boilers.
Moisture content in wood pellets is very low (8-10% of weight) compared to that of well-dried firewood (20% of weight in summer-dry conditions and 25% in the winter).
Very Little Ash
TidyFire burners produce very little ash with wood pellets.
Ash content of wood pellets is only 0.4-0.5% of weight and this is all that remains after the complete combustion of TidyFire.
Biopellets from Crop Residue
TidyFire burners burn biopellets and briquettes made from crop residue just like wood pellets - cleanly and with extremely high efficiency.
Density of such biopellets is close to that of wood pellets, while net heating value per weight is more or less at the same level.
Straw pellets result in about ten times more ash than wood pellets, while husk or hull pellets contain roughly half the ash of straw.
Ash is a highly effective form of fertilizer and can be used for gardening and soil improvement.
However, high ash content brings to bear a slight drawback.
Temperature of embers has to be 950-1100℃ for straw to burn efficiently and cleanly.
Melting point of ash depends on its composition.
Highly alkaline ash melts below the desired temprature, resulting in slag formation on the grate of the burner.
The usage of some biomass qualities in their pure form is troublesome because of this, as they cannot be burnt efficiently and cleanly without the formation of slag.
Use of crop residue as biofuel is increasing.
A considerable share of this use takes place in the form of straw and husk or hull pellets.
Straw pellets are also called stalk pellets or stover pellets in different contexts, while it's essentially the same fuel product.
The following covers some common forms of solid biofuel used in different parts of the world.
Net heating value of corn straw pellets is about 4.8 kWh/kg.
Ash content of corn stover is 5.2% in average - lower in cold climate and spring harvested stover and higher in warm climate and fall harvested stover, according to a Canadian study.
Ash resulting from burning corn straw pellets in a TidyFire burner has a light, yellow-brown color and a powder-like consistency.
Such powder-like ash is effortlessly removed with the patented TidyFire grate, simply by pulling a lever.
Canola/Rapeseed Straw and Hull
Oilseed rape straw is an excellent choice of biomass for pellet fuel.
Its ash content of about 5% is highly resistant against melting, making it one of the most tidy biofuels to handle as it is unlikely to form slag under any circumstances.
The residue/byproduct of making canola oil, the rapeseed hull, is however much more volatile what comes to ash content.
Combustion efficiency and net heating value of rapeseed hull pellets are high due to the oily consistency.
Rapeseed hull pellets are hence an interesting choice for biofuel, provided that they are not allowed to burn too hot.
Wheat straw pellets are well suited for combustion.
Their ash content is on the higher side at about 6-7% in average with a lot of variation.
However, the ash is much less alkaline than in many other cereals, which makes it less likely to melt and form slag on the grate of the burner.
Some straw pellet producers mix wheat with other plants, such as canola/rapeseed.
Oat, Barley, and Rye Straw
Oat, Barley, and Rye straw have a 4-5% ash content, which is alkaline and likely to melt.
Proper additives are needed with these cereals to fully avoid formation of slag on the grate of the burner.
These additives increase production costs and raise overall ash content.
Rice Husk and Straw
Grains are traditionally dried up in rice mills with air heated up by burning rice husk - the waste product of the mill.
While pelletized rice husk is a good form of biofuel, rice straw is less preferable because of its high ash content, which varies significantly around a mean figure of 18%.
The density of cotton stalk pellets can be close to or higher than that of wood pellets.
This is the main advantage of cotton stalk, while ash content ranges from 5% to 10%.
Sunflower Seed Shells
Sunflower seed shells are typically used in the processing facility like rice husk.
Ash content is usual in the category of seed shells - at about 2.5%.
There is no need to give up the option of using firewood - quite the opposite.
Standalone TidyFire burners are simply removed from the fireplace to allow the use of firewood.
Hybrid TidyFire burners are integrated into fireplaces to guarantee equally clean combustion of both firewood and other forms of biomass.
If you are planning to hire a fireplace mason, contact us and we'll be happy to support you and your mason in realizing your new fireplace with an intagrated hybrid TidyFire burner.
Charcoal, Briquettes, and Biochar
Charcoal burns with smooth and even glow in TidyFire burners producing very little ash.
The resulting even heat greatly eases cooking with charcoal, while food items stay clean in the absence of fly ash.
Fly ash is a problem of conventional charcoal grills, especially notable in windy conditions.
With such conventional charcoal grills the fly ash is impure due to incomplete combustion and any gust of wind is likely to pollute your food with it.
Impurities of the fly ash produced by a conventional grill include organic compounds known to be carcinogenic.
In contrast, the little ash produced by TidyFire burners is composed of pure, incombustible earth minerals only and includes concentrated trace elements essential for life.
Such pure earth minerals in the form of ash produced by TidyFire burners are not only edible, but promote health and prevent diseases.
Charcoal briquettes and biochar are fine alternatives to charcoal.
Charcoal briquettes contain binders like starch, and additives like sodium nitrate, which result in more ash than pure charcoal.
Biochar briquettes are usually made from crop residue, such as straw and husk.
Biochar thus results in even more ash than charcoal briquettes, since crop residue contains more ash than wood.
Black pellets are one emerging form of biocoal and torrefied wood pellets, produced among others by Solvay, seem to be an especially promising type.
Energy density of torrefied wood pellets is 4500-5100 kWh/m3.
That is roughly 1.5 times the energy density of widely available, regular wood pellets, and 4.3-6.9 times the energy density of firewood.
TidyFire burners and fireplaces burn all forms of biocoal cleanly and efficiently.
Wood Chips / Chopped Biomass
Wood chips and similar coarsely chopped biomass can be used in place of pellets.
They can be burnt cleanly, but produce much less heat (500-900kWh/m3) due to low density (150-350kg/m3) and generally high moisture content (varies widely).
Wood chips are less tidy to handle as they contain bark and other loose impurities that easily scatter around.
Chips are usually made from thinning and logging residue such as branches, tops, and stumps.
Branches, tops, and coppice contain a lot of bark.
Ash content of chips depends on the part(s) of wood used and is roughly 0.4% for pure barkless timber, 2% for branches and coppice, 3% for bark, and 5% for the needles of conifer trees.
Crops specifically grown for energy include willow, alder, poplar, and dense grasses such as elephant grass.
Energy crop pellets are notably cheaper than commercial quality wood pellets due to their lower fuel quality.
Wood pellets and chips from energy crops are often made from coppice and hence include bark.
Bark and the fast growth of energy crops together result in a higher ash content and lower heating value in comparison to commercial quality wood pellets.
Commercial quality wood pellets are madde from processing residue of sawn timber and other refined wood products.
Species typically used for refined wood products grow a lot slower than the woody energy crops.