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Abstract
The modernization of the technological scheme is considered by integrating an absorption chiller, the operation of which is based on the use of heat from the exhaust gases of a gas turbine engine. The cold obtained in the absorption chiller is directed to cooling the air immediately before it enters the axial compressor of the engine, as well as to pre-cooling the process gas before its compression in the supercharger. In parallel, a cycle with regeneration is introduced, where the heat from the exhaust gases is used to heat the compressed air after the compressor in front of the combustion chamber. The mathematical model of the integrated cooling system includes four interconnected blocks of equations: a model of heat and energy flows from three heat sources of gas-pumping units; a thermodynamic model of the absorption chiller cycle; equations of cooler characteristics; dependences of the operational efficiency of gas-pumping units; on the temperatures of the cooled flows. The calculation was performed for a typical gas compressor station of the main gas pipeline of Ukraine with one gas pumping unit based on gas pumping units with a capacity of 16 MW. The principles of cascading heat use by temperature potential levels are substantiated, which allows bringing the system closer to the thermodynamic optimum and minimizing exergy losses compared to traditional direct heat discharge into the environment. A schematic diagram of an integrated system with four functional blocks and three temperature circuits of heat carriers is developed; the priority of cold consumers is determined depending on seasonal operating conditions. At the same time, the use of a scheme with heat regeneration, namely, the introduction of compressed air heating after the compressor requires careful assessment. Such a solution allows reducing the amount of fuel required to heat the working fluid in the combustion chamber, but sometimes the expected result is not achieved. The proposed complex scheme for the utilization of exhaust gas heat from gas pumping units requires an in-depth analysis to determine the most advantageous operating modes and optimal equipment parameters in the conditions of a specific compressor station. The results obtained confirm the technical ability of the integrated system to cover all cooling needs at an economically acceptable level of capital costs
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