System analysis as a tool for implementing low–waste and waste–free production at oil and gas industry enterprises

The introduction of low–waste and waste–free technologies is an actual development direction for oil and gas enterprises, in particular for oil refineries. Development of methodological approaches to the analysis and synthesis of complex energy systems in order to increase the efficiency and environmental safety of the objects under study through the introduction of low–waste and waste–free technologies, the implementation of technological cycles close to closed. The solution of the task is carried out in accordance with the basic principles of the system analysis of complex objects, in stages: analysis of the structure of the object using the decomposition–aggregation approach; determination of internal and external links between the elements of the system; determination of the regularities of the functioning of the object and the complex of influencing factors. A block–hierarchical structure of an oil refining enterprise has been developed, which establishes quantitative and qualitative links between the elements of the system at all levels of the hierarchy. A system of performance indicators is proposed, in accordance with which an assessment is made of the current state of the object under study. The most energy–intensive production facilities of an oil refining enterprise have been determined, their exergy balances, have been calculated. The analysis made it possible to assess the potential for increasing environmental and energy efficiency, the main directions for the implementation of low–waste and waste–free technologies. Science–based directions for improving environmental safety and energy efficiency of the object of study are determined. Several options for schemes are proposed, an assessment of the energy and technical and economic efficiency of the integration of the proposed solutions into the energy complex of oil refineries is carried out. The results obtained confirm the feasibility of integrating the proposed scheme in an existing enterprise.

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