Change of gas emission parameters when feeding oil-containing water into the gas duct, modeling the gas outlet pipeline of the ship's diesel engine

Thermal neutralization of oil-containing waters using the heat of exhaust gases of marine diesel engines is a promising direction for minimizing environmental damage from water transport. One of the implementation options for this method is based on spraying oil-containing waters into the flow of hot exhaust gases of a marine diesel engine. However, the effect of this process on the composition of combustion products has hardly been studied. The patterns of changes in the concentration of key components of combustion products (oxygen O2, carbon dioxide CO2, carbon monoxide CO, nitrogen oxides NOx and hydrocarbons CH) when feeding oil-containing waters into the flow of hot exhaust gases are investigated. The experiments were conducted on a laboratory bench simulating the conditions of a marine diesel engine flue, using a gas burner as a source of hot gases. The experiment was carried out according to a plan based on the Plackett – Berman plans, which made it possible to identify significant factors and their influence on the exhaust gas composition. The experiment was conducted with variation of three factors: oil-containing water feed pressure, combustion product temperature, and oil product concentration in oil-containing water. Particular attention was paid to the analysis of the mechanisms of chemical reactions occurring during thermal decomposition of oil-containing water, including hydrocarbon oxidation, carbon monoxide CO conversion, and nitrogen oxide NOₓ formation. Possible catalytic effects associated with the flue material, as well as the influence of water vapor on the reaction equilibrium, were considered. The conducted dispersion analysis made it possible to determine the degree of influence of each factor on changes in the exhaust gas composition. The data obtained form the basis for moving on to an interpolation (extreme) experiment.