Franchuk Y. Comprehensive assessment of natural gas quality to increase the accuracy of its accounting and operational reliability of gas supply systems.

The dissertation solves the current scientific and practical problem of comprehensive assessment of natural gas quality at the stages of "extraction - preparation for transportation - transportation - distribution - use by the end user", which will increase the accuracy of fuel accounting in energy units and introduce a differentiated fee depending on energy value. Based on the results of the analysis, the existing methods, methods and technical means of natural gas metering are identified and a substantiated mathematical model of decision support for natural gas quality assessment taking into account qualitative and quantitative factors is proposed. On the basis of analytical researches the hierarchical classification and formalization of factors of influence on quality of natural gas is constructed and proved, which gives the chance to receive functions of belonging of estimations of influence of each factor. An engineering method for determining the quality assessment of natural gas at the final consumer and a software product for its computer implementation are proposed. This allows to determine the priority of factors influencing fuel quality and, accordingly, to justify the priority of measures to improve fuel quality, as well as the operational reliability of gas supply systems through the implementation of precautionary measures. These theoretical positions were confirmed in the course of experimental studies of the factors influencing the process of gas drying to prevent the formation of crystal hydrates. Technical solutions to increase the operational reliability of gas supply systems are proposed. The technological scheme of the natural gas metering information system has been improved, which will increase the reliability of the introduction of daily fuel balancing and solve problems in agreeing on the actual costs between economic entities in the transportation, distribution and use of natural gas. Feasibility study of the proposed method and means of natural gas metering is carried out. Key words: natural gas, physicochemical properties, quality, gas supply system, operational reliability, factors influencing technical condition, membership functions, linguistic variable, humidity, dehumidification, accounting, intelligent gas meter, measurement accuracy.