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Stone coal could be, at least partially, substituted by charcoal - and often was in the past, where reachable underground coal reserves were not available.
by m4rtink 5y ago
Stone coal could be, at least partially, substituted by charcoal - and often was in the past, where reachable underground coal reserves were not available.
- mcguire 5y ago"So by weight charcoal and anthracite coal have an energy density of about 30 MJ/kg, while poorer kinds of coal range down to half of that." (https://www.reddit.com/r/askscience/comments/udjl5/charcoal_vs_coal/ https://www.reddit.com/r/askscience/comments/udjl5/charcoal_...) However, the density of charcoal is much less than that of coal: 200 kg/m^3 vs 1500 kg/m^3 (for solid anthracite). Producing 1kg of charcoal requires 3-4kg of wood. (Producing the 900°C for the process is an exercise for the reader.) (https://www.fao.org/3/y4450e/y4450e11.htm https://www.fao.org/3/y4450e/y4450e11.htm)