Wood Charcoal


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Wood Charcoal

 

a hard, porous, highly carbonaceous product formed during the heating of wood without access (or with limited access) of air in furnaces and retorts (sometimes in campfires as well). Depending on the type of wood, 1 m3 yields 140-180 kg of coal, 280-400 kg of liquid products, and nearly 80 kg of fuel gas. The heat of combustion of wood charcoal is 30,000-35,000 kJ/kg (7,000-8,100 kcal/kg). The density of birch coal is 380 kg/m3. Pines (300 kg/m3) and spruces (260 kg/m3) yield less dense coal.

The high porosity of wood charcoal is responsible for its significant adsorption properties. At normal temperature wood charcoal is capable of combining with the oxygen in air; this is the reason for cases of spontaneous combustion of wood charcoal. The moisture content of wood charcoal unloaded from furnaces and retorts is 2-4 percent. During storage, the moisture content rises to 7-15 percent. The ash content of charcoal should not exceed 3 percent and the content of volatiles, not more than 20 percent. A distinctive feature of wood charcoal is the low content of such admixtures as phosphorus and sulfur, which makes it indispensable in some metallurgical processes.

Wood charcoal is widely used in the production of crystalline silicon, carbon disulfide, activated carbon, and electrocarbon articles and as fuel for domestic use.

References in periodicals archive ?
Calorific value ranged between 27kJ/g and 32kJ/g which compared well with that of wood charcoal (33kJ/g) sourced from local vendors (Njenga et al., 2017).
'Selling wood charcoal is a right path to make huge money and the market is so friendly, because a lot of people passing here are so dire need of it as an alternative source of energy, especially cooking,' she reiterated.
Djibouti mainly exports sheep and goats, wood charcoal, coffee and refined petroleum to Saudi Arabia, Yemen, Egypt, Spain, and Finland.
The global production of wood charcoal was estimated at 47 million metric tonnes in 2009 and increased by 9% since 2004 with Africa accounting for 63% of global production.
One of which is cutting down of trees, to make fuels for domestic purposes, one concrete example is the wood charcoal [19-26].
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In contrast, when we burn wood, it results in wood charcoal and continues to burn until it turns to ash.