The calorific value is a characteristic of the fuel itself. The calorific value is determined by the fuel itself. Each fuel has a certain calorific value. The calorific value of different fuels is generally different. The calorific value of the same fuel does not change with whether the combustion is complete or not, nor does it change with the fuel quality.
The heat released by the complete combustion of 1 kg (per cubic meter) of certain solid (gas) fuel is called the calorific value of the fuel. The calorific value reflects the fuel combustion characteristics, that is, the ability of different fuels to convert chemical energy into internal energy in the combustion process. The calorific value is only related to the type of fuel.