Charcoal is a dark brown or black porous solid fuel left by incomplete combustion of wood or wood raw materials or pyrolysis under the condition of air isolation.
Charcoal is an impure amorphous carbon, which keeps the original structure of wood and leaves tar in its pores. Charcoal was used in bronze wares of Shang Dynasty and ironware smelting in Spring and Autumn Period and Warring States Period in China, and its hygroscopicity was used to observe climate change.
Charcoal is mainly composed of carbon with low ash content, and its calorific value is about 27.2 1~33.49 MJ/kg. In addition, there are hydrogen, oxygen, nitrogen and a small amount of other elements, and their contents have little to do with tree species, mainly depending on the final temperature of carbonization.
Charcoal is a hydrophobic substance, with ash content less than 6%, porosity accounting for more than 7% of its volume, specific gravity generally being 1.3 ~ 1.4, calorific value depending on carbonization conditions, generally about 8,000 kcal/kg, and its reduction capacity is greater than that of coke.
Extended data:
Machine-made carbon, also known as machine-made carbon, wood sticks, artificial carbon, recycled carbon and smokeless clean carbon, is a kind of carbon stick extruded from sawdust. It originated in Japan, and its products were called "insufficient wood strength", and it was introduced to Chinese mainland through Taiwan Province Province. The raw materials of carbon stick are extensive, including rice husk, peanut husk, cotton husk, corn cob, corn stalk, sorghum stalk and so on.
Carbon rods have a broad market. The hotel is used as charcoal for barbecue. The density of stick charcoal is more than 3 times that of charcoal, and it burns smokeless. In industry, rod charcoal is used to produce carbon disulfide and iron and steel smelting. Carbon rods are also used as auxiliary fuel for boilers. Its density is similar to that of coal, and its calorific value is 5500~7000 kcal/kg, but its ash content is obviously lower than that of coal.
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