GASDYNAMIC PARAMETERS OF GAS DISTRIBUTION NETWORKS AFTER RECONSTRUCTION USING THE TECHNOLOGY OF DRAWING OF A POLYETHYLENE PIPE INTO A STEEL GAS PIPELINE
Keywords:
restoration of gas network performance, trenchless pipe replacement, natural gas, gas-hydrogen mixtures, volumetric heat of combustion, change in flow and operating pressureAbstract
Gas distribution networks of Ukraine, which are constructed of steel pipes, are characterized by a long service life. An important condition for ensuring reliable gas supply is their reconstruction with the replacement of worn steel pipes with polyethylene ones. One of the progressive reconstruction technologies is the pulling of a polyethylene gas pipeline into a worn steel pipe. The implementation of such a reconstruction technology in the conditions of Ukraine will not only restore the functioning of the gas supply system, but also create conditions for reliable transportation of not only gas, but also gas-hydrogen mixtures. The reconstruction of the gas distribution network involves changing the diameters of sections, the roughness of the pipe surface and the properties of the transported medium, which significantly affects the operating modes. The purpose of the work is to establish the patterns of changes in the gas-dynamic energy consumption of gas distribution networks after reconstruction using the technology of pulling a polyethylene gas pipeline into a worn steel gas pipeline for the transportation of both natural gas and gas-hydrogen mixtures. The physical, thermodynamic and energy characteristics of natural gas and gas-hydrogen mixtures have been determined in accordance with the requirements of current standards. The patterns of change in the gas-dynamic energy consumption of an element of the gas supply system after replacing a steel gas pipeline with a polyethylene one at different degrees of its loading when transporting natural gas have been established. The need to change the operating pressure in a polyethylene gas pipeline after reconstruction from low to medium has been confirmed. The increased consumption of gas-hydrogen mixtures in a polyethylene gas pipeline has been determined to preserve the amount of energy that natural gas provided before the reconstruction of the network. Analytical dependences of the specific gas-dynamic energy consumption of polyethylene gas pipelines on the degree of their loading and the molar concentration of hydrogen in the gas-hydrogen mixture have been obtained for a number of cases recommended by the regulatory document for replacing steel pipes with polyethylene pipes.
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