Guide: Among the material fuels, material fuels are more economical. They are generally processed crops, peanut shells, bark, sawdust, and solid waste.

　　Among the material fuels, material fuels are more economical. They are generally processed crops, peanut shells, bark, sawdust, and solid waste. The fuel is generally about 7mm in diameter and 30~35mm in length. The rate is between 1.5% and 2.0%, the dry basis water content is about 12%, the ash content is less than 1.5%, the content of sulfur and chlorine are less than 0.07%, and the content of nitrogen is less than 0.5%. If additives need to be used, they should be agricultural and forestry products, and the types and quantities used need to be indicated. In the EU standards, there is no specific value for the calorific value of the material fuel, but it requires businesses to clearly indicate it. According to the Swedish standard for material fuels, it is generally required that its calorific value should be above 16.9MJ.