Specific Features of the Ignition Behavior of Coal-Water Fuel with the Addition of Glycerol

The usage of coal-water fuel instead of dry coal for heat and power generation is a promising way to decrease harmful emissions during power generation. Improvement of the coal-water fuel ignition and combustion parameters is important due to the specifics of the fuel. The use of glycerol as a flammable additive to the coal-water fuel is environmentally friendly and leads to reducing the ignition time and threshold temperature of that composition fuel. Generally accepted approximation of the dependence of the main combustion parameters includes the ignition temperature and the time delay before ignition on the glycerol content of the fuel composition does not correspond to the physical nature of the process and does not reflect the real nature of the change. To approximate the experimental data in the case of complex two-component fuel based on the coal-water slurry and glycerol, a more suitable and physically correct inverse sigmoid function is proposed. The applicability of the proposed function has been confirmed by experimental studies.