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This paper presents the quality requirements for the treatment of diesel fuel to reduce environmental pollution. The total operating costs of the conventional diesel treatment system are considered. The results of the dependence of the components of the costs and the total costs of cleaning diesel fuel on the quality of preliminary cleaning are summarized. A plan has been developed to minimize the cost of pre-treatment of diesel fuel.

This paper discusses low-temperature gas purification to improve environmental efficiency. Modern methods of gas cooling are also considered. A mathematical model is proposed for changing the parameters of an ideal gas when flowing through an opening - a Laval nozzle. A graph of the temperature of the gas at the outlet of the Laval nozzle is plotted at a different pressure ratio at the inlet and outlet of the nozzle. The conclusion was made based on the obtained values.