The high level of coal fever, that is, the amount of heat generated by the incineration of coal under atmospheric pressure in the air. Essentially, it is the heat obtained by subtracting the heat generated by sulfuric acid and nitric acid from the fever of the coal cartridge measured in the laboratory.

The coal preparation equipment should point out that the fever of the coal cartridge is measured under the condition of constant volume, so it is also called the fever of the constant volume cartridge. The high fever volume converted from the fever volume of the constant volume cartridge is also called the constant volume high fever volume. When coal is burned in the air at atmospheric pressure under the condition of wet and constant pressure (atmospheric pressure is fixed), its high fever is wet constant pressure and high fever. There is a distinction between constant volume high fever and constant pressure high fever. Normally, the constant volume high fever is 8.4~20.9J/g lower than the constant pressure high fever. In essence, when the accuracy is not high, it is usually not corrected.