Abstract
The relevance of the study is substantiated by the fact that when managing the processes of oil transportation through main pipelines, it becomes necessary to determine and select the optimal operating modes of the oil pipeline units, taking into account the fuzziness of some part of the initial information. In this regard, solving the problem of multi-criteria selection of effective operating modes for an oil heating station for a hot oil pipeline system, which is often described in a fuzzy environment, based on the apparatus of fuzzy set theories, is an urgent scientific and practical problem. A method for the synthesis of models in the conditions of fuzzy output parameters of the object has been developed, with the help of which fuzzy models of the investigated oil heating station of the main oil pipeline have been built. Based on the modification and combination of various optimality principles, mathematical formulations of the problem of multi-criteria selection of effective operating modes for an oil heating station in a fuzzy environment are obtained. By modifying and adapting the principles of guaranteed results and equality in a fuzzy environment, a heuristic method has been developed for solving the formulated problem of selecting object's operation modes using the initial fuzzy information. The proposed heuristic method for multi-criteria selection in a fuzzy environment is based on the use of the experience and knowledge of the decision-maker. The proposed approach is implemented in the formulation and solution of the problem of multi-criteria selection of operating modes of the oil heating station in Atyrau of the Uzen-Atyrau-Samara main oil pipeline. As a result of the application of the proposed method, an improvement in the degree of fulfillment of a fuzzy restriction on environmental impact was achieved by 2 %, as well as the optimal values of the operating parameters of the object were improved: the temperature was reduced by 1.85 % (5.67 K), pressure – by 0.04 % (kPa) and fuel consumption – by 2.9 % (0.0002 kg/s). The obtained results have confirmed the effectiveness of the proposed approach to solving the assigned tasks.
Highlights
Main oil pipelines are parts of a complex, extensive technological system with a considerable length
For the collection, formalization, and use of fuzzy information for the development of models of quantitatively difficult-to-describe objects, this paper proposes a method for the synthesis of fuzzy models based on the methods of expert evaluations and theories of fuzzy sets, and for the multi-criteria selection of operating modes in a fuzzy environment, a heuristic method based on the modification of various give-and-take schemes and application of the apparatus of fuzzy sets is proposed
On the basis of the carried out research, we propose a concept of formalization and mathematical formulation of the problem of multi-criteria selection of effective operating modes for an oil heating station of a main oil pipeline in a fuzzy environment for developing a method for its solution
Summary
Main oil pipelines are parts of a complex, extensive technological system with a considerable length. The system of main oil pipelines includes oil pumping stations, oil heating stations (when pumping viscous oils), and linear sections (the pipeline itself), as well as telecommunications, automation, telemechanics, and fire-fighting devices [1, 2]. Compared to other types of oil transportation, main oil pipelines are a more efficient and environmentally safe mode of transportation of oil, oil products, and gases [3]. Oil from the field through pipeline 1 is supplied to tank farm 2 of the main pumping station. The tanks are equipped with heating devices that maintain a temperature that allows oil to be pumped out by booster pumps 3
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