Effect of Oxidizer Composition on the Self-Ignition Time of Coal–Water Slurry Droplet Flow

The development of advanced technologies such as oxy-fuel pulverized-fuel combustion will solve a number of problems and improve the environmental impact of burning hydrocarbon fuels (including waste) at power plants. In this work, experiments were conducted on a laboratory setup to study the self-ignition of droplets of a coal–water slurry in a tubular reactor. The dependence of the ignition induction period on the concentration of oxygen and carbon dioxide under adiabatic conditions was investigated. It has been shown that increasing the O₂ concentration by 1 vol % reduces the ignition time by 5.14% under the considered experimental conditions. It has been established that increasing the CO_2 concentration in the flow at the same oxygen concentration does not have a significant effect on the ignition time under these conditions.