一.Physical and chemical properties
The main component of charcoal is carbon, with very low ash content and a calorific value of about 27.21~33.49 MJ/kg. In addition, there are hydrogen, oxygen, nitrogen and a small amount of other elements. Their content has little to do with the tree species and mainly depends on the final temperature of carbonization. Charcoal is a hydrophobic substance with an ash content of less than 6%. The pores account for more than 7% of the volume of charcoal. The specific gravity is generally 1.3~1.4. The calorific value depends on the carbonization conditions, generally around 8000 kcal/kg. The reducing ability of charcoal is greater than that of coke. Charcoal has a large number of micropores and transitional pores, which not only gives it a higher specific surface area, but also has good adsorption properties after the tar substances in the pores are removed. Complete combustion with oxygen produces carbon dioxide, and incomplete combustion produces toxic gas carbon monoxide. It is relatively loose.
二,Classification of charcoal
1.Machine-made charcoal
Using sawdust as raw material, the main process is to form sawdust by machine at high temperature and high pressure, and then send it into the carbonization furnace for carbonization. No additives are needed in the entire production process, and it belongs to the category of environmentally friendly products. There are two main shapes on the market: hexagonal with a hole in the center and square with a hole in the center. As a substitute for traditional charcoal (traditional charcoal: made from trees, burned, a resource-destroying industry, banned by the state), machine-made charcoal has many advantages such as long burning time, high calorific value, no smoke, no explosion, and environmental protection.
