Fuel sawdust wafers (briquettes) are popular for decades as cost-saving fuel and are currently being used worldwide. Fuel briquettes are made of dry sawdust, both pinewood (soft wood) and hardwood in its origin. As an option, briquettes can also be made of husk of sunflower, rice, buckwheat, flax, oats, etc.
Wood briquettes do not contain any harmful agents including adhesive substances. The briquettes are cylindrically-shaped due to specific compression conditions including high pressure and temperature. Fuel briquettes have widespread use and can be used in any type of combustion furnaces, district heating boilers, wood-fired boilers, etc.; briquettes are ideal to burn in chimneys, stoves, grills, etc. A great “pro” argument for use briquettes is due to the fact that combustion temperature is essentially constant for a period of 4 hours.
Wood briquettes when used as fuel are beneficial in that their environmental impact in the process of burning is small compared to conventional solid fuels like coal – in particular, briquettes have the same caloric value as coal while containing 15 times less ash (max. 1.0%).
The wood fuel briquettes manufacturing technology is based upon high-pressure and high-temperature process of compacting powdered waste wood (sawdust), and LIGNIN as an adhesive agent is a natural component of plant cells.
Prolonged combustion period
That is, the furnace feeding with briquettes, in periodic operation mode could be three times less frequent compared to conventional firewood. Briquettes burn with minimum smoke emitting, no cracks like a shot, no spark. Furthermore, briquettes maintain constant temperature throughout the combustion process. Briquettes turn coal after combustion like conventional firewood does, and then they can be further used in barbecue or grill cooking.
Caloric value of briquettes exceeds that of conventional firewood, and close to caloric power of black coal. If briquettes or their combustion residues are brought in contact with fat (e.g. when used in barbecue or grill cooking), no vigorous inflammation occurs, instead, quiet smoldering or low tranquil flame burning persists. A great benefit introduced by briquettes is due to the fact that their combustion temperature is essentially constant for a period of 4 hours. Caloric value of sawdust briquettes is as follows 4400 kcal, or 18 МJ.
Comparative characteristics of briquettes and conventional fuels in terms of their caloric values:
|Wood (damp solid):||2450 kcal/kg|
|Wood (dried solid):||2930 kcal/kg|
|Brown coal:||3910 kcal/kg|
|Waste wood briquettes:||4400 kcal/kg|
|Black coal:||4900 kcal/kg|
Fuel briquettes are considered as “eco-friendly” product since their production process is free of additives. Sawdust briquettes when used as fuel are beneficial in that their environmental impact in the process of burning is small compared to conventional solid fuels like coal – in particular, briquettes have the same caloric value as coal while containing 15 times less ash (max. 1.0%); that can be used as fertilizer.
Comparative technical characteristics:
Ash content in percent:
|Waste wood briquettes:||0,12% to 1%|
Atmospheric CO2 emissions in the process of burning compared to wood briquettes:
|Lightweight oil:||20 times higher|
|Anthracite:||50 times higher|
|Coke||30 times higher|
|Natural gas:||15 times higher|