A briquette (or briquet) is a block of flammable matter used as fuel to start and maintain a fire. Common types of briquettes are charcoal briquettes and biomass briquettes.
Some briquettes are compressed and dried brown coal extruded into hard blocks. This is a common technique for low rank coals. They are typically dried to 12-18% moisture, and are primarily used in household and industry.
A number of companies in India have switched from furnace oil to biomass briquettes to save costs on boiler fuels. The use of biomass briquettes is predominant in the southern parts of India, where coal and furnace oil are being replaced by biomass briquettes. A number of units in Maharashtra (India) are also using biomass briquettes as boiler fuel. Use of biomass briquettes can earn Carbon Credits for reducing emissions in the atmosphere. Lanxess India and a few other large companies are supposedly using biomass briquettes for earning Carbon Credits by switching their boiler fuel. Biomass briquettes also provide more calorific value/kg and save around 30-40 percent of boiler fuel costs.
A popular biomass briquette emerging in developed countries takes a waste produce such as sawdust, compresses it and then extrudes it to make a reconsistuted log that can replace firewood. It is a similar process to forming a wood pellet but on a larger scale. There are no binders involved in this process. The natural lignin in the wood binds the particles of wood together to form a solid. Burning a wood briquette is far more efficient than burning firewood. Moisture content of a briquette can be as low as 4%, whereas green firewood may be as high as 65%.
For example parameters of fuel briquettes made by extrusion from sawdust in Ukraine:
Parameter !! Value | |
Briquette density, t/m³ | 1,0-1,2 |
Heat content, kilocalories/kg | 4600-4900 |
Ash content, % | 0,5-1,5 |
The extrusion production technology of briquettes is the process of extrusion screw wastes (straw, sunflower husks, buckwheat, etc.) or finely shredded wood waste (sawdust) under high pressure when heated from 160 to 350 C °. As shown in the table above the quality of such briquets, especially heat content, is much higher comparing with other methods like using piston presses.
Sawdust briquettes have developed over time with two distinct types: those with holes through the centre, and those that are solid. Both types are classified as briquettes but are formed using different techniques. A solid briquette is manufactured using a piston press that compresses sandwiched layers of sawdust together. Briquettes with a hole are produced with a screw press. The hole is from the screw thread passing through the centre, but it also increases the surface area of the log and aids efficient combustion.
Since 2009 in North India biomass briquette consumption has seen new dimensions. Many companies like Nishant Bioenergy and Ekta Bioenergy in Rajasthan are leading in the briquette supply and manufacturing.
Category:Appropriate technology
ar:فحم مضغوط cs:Briketa de:Brikett el:Μπρικέτα es:Briqueta eo:Briketo fa:بریکت nl:Briket ja:成形木炭 pl:Brykiet ksh:Klütt ru:Брикет (металлургия) sk:Briketa sv:Grillbriketter uk:БрикетThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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