Some briquettes are compressed and dried brown coal (Ireland, peat briquettes are a common type of solid fuel after coal. Although often used as the sole fuel for a fire, they are also used to begin a coal fire quickly without hassle. A fire burning peat briquettes is, similarly to a turf fire, slow burning. Peat briquettes can be used as an acceptable substitute for charcoal in barbecues for this reason.
means for removing the quartz sand of the bed from the furnace exit with the briquettes, for separating the removed sand from the briquettes, and for recirculating the quartz sand of the bed from the furnace exit to the furnace entry and furnace exit for reintroduction into the bed.
A very important factor in briquette quality has been a special heat treatment in which the blanks are stored substantially at their briquetting temperature in insulated bunkers for several hours--i.e., a heat treatment or tempering and using the intrinsic heat of the blanks thereby doubling the strength of the briquettes.
Advantageously, to produce green briquettes substantially devoid of impurities derived from the carbon carriers or the bituminous binders, the process is performed using shaped bodies having oil coke as carbon carriers and/or petroleum-based pitches as bituminous binders.
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