MULTILAYER FUEL BRIQUET Russian patent published in 2012 - IPC C10L5/14 

FIELD: fuel chemistry.

SUBSTANCE: invention relates to multilayer fuel briquet of combustible organic substances and may be used for producing domestic fuel briquets for fireplaces, portable stoves, for cooking, for heating dwelling premises and utility premises, for heating railway cars, etc. A multilayer fuel briquet comprises the main layer made of hard coal and the incendiary layer containing hard coal and nitrate. All the briquet surface is horizontally perforated. The incendiary layer contains 10-15% of hard coal, 10-25% of potassium nitrate, or, additionally, sodium nitrate 10-25%, additional stearine or paraffine 5-15% and hexamethylenetetramine 45-75%. The incendiary layer is made in the form of a lens coaxial with the openings which diameter is decreasing from the centre to each briquet side. Hard coal, hexamethylenetetramine and potassium nitrate or sodium nitrate enable easy ignition from low-temperature sources such as a match, etc.

EFFECT: lens-line form of the incendiary layer makes it more light-weight, this decreasing the briquet cost. Besides, such form enhances the bond performance of the main and the incendiary layer and safe ignition of the main layer.

2 dwg, 1 ex