The article presents the results of research on improving the efficiency of adsorption vapor recovery units (VRU), the action of which is based on the attachment of hydrocarbon molecules to coal particles located in the adsorbers, and their subsequent targeted selection. During the operation of adsorption VRU, the correct mode of operation of the adsorbers is relevant, which means the structure of the cycle and the duration of individual operations within the stages that make up the cycle. At the same time, an operation is understood as a single procedure in the work cycle of the VRU, a stage is a set of individual operations in the work of the VRU, which is part of the cycle, a cycle is a periodically repeating sequence of stages in the work of the VRU. The possible modes of operation of the adsorbers differ in the number of stages in the cycle and the duration of individual operations within the stages. Based on industrial studies of the work of the adsorption VRU, it was found that it is impractical to increase the duration of the adsorption operation in order to ensure effective purification of gas-air mixture from hydrocarbons. Moreover, it is shown that the duration of this operation should be reduced, since at the same time the degree of purification of the gas-air mixture from hydrocarbons increases. Thus, with a decrease in the duration of the adsorption operation from 20 to 18 min, the hydrocarbon content in the gas-air mixture at the outlet of the VRU decreases from 177.7 to 169.5 g/m3 (or 4.6%), and the average degree of gas-air mixture purification increases by 2.4-3.1% in absolute terms. If the duration of the adsorption operation is reduced to 15 min, then the emission reduction will be 21.3 g/m3 or 12%, and the average degree of gas-air mixture purification from oil vapor during the operation increases by 6.1-8.1%. These results are achieved without additional capital investments, using only organizational measures. If the number of adsorbers is increased from 8 to 12, and the duration of the adsorption operation is reduced to 10 min, then the degree of gas-air mixture purification, depending on the depth of vacuuming, will increase from 6.1 to 15.1% in absolute terms.
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