Experimental study of combustion of liquid hydrocarbons under the conditions of vapor gasification in the presence of a diluent gas

The characteristics of combustion of liquid hydrocarbons in the presence of a mixture of superheated water vapor with a diluent gas in a vaporizing burner are studied by an example of diesel fuel. Carbon dioxide is used as a diluent gas. The experiments reveal regimes of injection of superheated water vapor or carbon dioxide, as well as their mixture in various proportions, that ensure similar profiles of the mean flame temperature, thermal power, and air-to-fuel ratio. It is demonstrated that fuel burning in the presence of superheated water vapor, carbon dioxide, and their mixture allows reaching low concentrations of $\mathrm{CO}$ and $\mathrm{NO}_x$ in combustion products. In the case of $\mathrm{CO}_2$ injection, these values are at the boundary of admissible concentrations for class $3$ in accordance with the EN:267 norms. In the case of injection of only superheated water vapor, the nitrogen oxide emissions in flue gases are smaller than those in the case of carbon dioxide injection: reduction of $\mathrm{NO}_x$ emissions can reach $15\%$.