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Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a submetallic lustre. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.
Coal comes in four main types or ranks: lignite or brown coal, bituminous coal or black coal, anthracite and graphite.Each type of coal has a certain set of physical parameters which are mostly controlled by moisture, volatile content (in terms of aliphatic or aromatic hydrocarbons) and carbon content.
Anthracite coal, the highest rank of coal, ... The energy density of coal is roughly 24 megajoules per kilogram [80] (approximately 6.7 kilowatt-hours per kg). For a ...
Some grades of anthracite coal are used for sintering, pulverized coal injection, direct blast furnace charge, pelletizing, and in production of ferro-alloys, silicon-manganese, calcium-carbide and silicon-carbide. Metallurgical coal produces strong, low-density coke when it is heated in a low-oxygen environment.
Its bank density (the density of a coal seam prior to breaking up during mining) is about 1346 kg/m 3 (84 lb/ft 3) while the bulk density of extracted coal is up to 833 kg/m 3 (52 lb/ft 3). [12] Bituminous coal characteristically burns with a smoky flame and softens and swells during combustion. [13]
An energy density of 18–20 GJ/m 3 – compared to the 26 to 33 gigajoules per tonne heat content of natural anthracite coal – can be achieved when combined with densification (pelletizing or briquetting) compared to values of 10–11 GJ/m 3 for raw biomass, driving a 40–50% reduction in transportation costs. Importantly, pelletizing or ...
Seems high, please check. Using a density of anthracite coal of 1.4g/cc and a specific energy of 32.5MJ/kg, you get 45.5MJ/L instead. - re: yes, correct it please. See wiki Coal_assay#Relative_density. Ideally for most materials we list the highest possible number, the record, then porosity is a separate issue, giving any low value you wish.
Coal slurry is a mixture of solids ... Anthracite; Bituminous coal; ... coal slurry fuels are recognised to have low energy density and therefore can only be ...