Active carbon materials of tree species can be divided into three categories: the first category is hardwood, such as beech, oak, elm, etc. second kinds of csclerophylla; soft hardwood, such as poplar, willow, linden; third for softwood, such as pine, pine, pine and other wetlands in South asia. It is necessary to produce high quality charcoal, suitable for industrial sectors such as metallurgical industry and carbon disulphide industry. Hard carbon materials should be selected for carbonization raw materials, and softwood is usually used to produce pine charcoal for manufacturing activated carbon.
The best size and uniform size of carbonized material is that the diameter is not more than 0 centimeters. If the diameter is too large, it should be split open and the splitting line length is less than 12 centimeters. The length of the material with high carbonization carbonization furnace or kiln decision, if the material is split, due to poor thermal conductivity of wood, gas mixture produced by carbonization, wood internal to the outside, through the desired path is very long, carbonization time is long. The mechanical strength of wood will decrease.
For fuelwood carbonization mostly sprout forest, the best harvesting in autumn and winter, the trees in the dormancy stage, sap flow, root storage material, from damage to sprout next year; and autumn weather, low relative humidity, low moisture content of wood, firewood cutting under dry, can shorten the carbonization time, reduce fuel consumption, charcoal production crack less, high quality.
In addition, the wood of rotten wood and disease withered wood is not suitable for carbonization, because charcoal is loose, fragile and easy to spontaneous combustion when decaying wood is carbonized, which greatly reduces the quality of charcoal.
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