Abstract
Prolonged operation of the gas-transport system in conditions of partial loading involves frequent changes in the volume of gas transportation, which necessitates prompt forecasting of system operation. When forecasting the modes of operation of the gas transport system, the main criterion of optimality implies the maximum volume of gas pumping. After all, in this case, the largest profit of the gas-transport company is achieved under the condition of full provision of consumers with energy. In conditions of incomplete loading of the gas-transport system caused by a shortage of gas supply, optimality criteria change significantly. First, the equipment is operated in ranges far from nominal ones which leads to growth of energy consumption. Secondly, changes in performance cause high-amplitude pressure fluctuations at the outlet of compressor stations. Based on mathematical modeling of nonstationary processes, amplitude and frequency of pressure fluctuations at the outlet of compressor stations which can cause the pipeline overload have been established. To prevent this, it was proposed to reduce initial pressure relative to the maximum one. Calculated dependence was obtained which connects the amplitude of pressure fluctuations with the characteristics of the gas pipeline and the nonstationary process. Reduction in energy consumption for transportation is due to the shutdown of individual compressor stations (CS). Mathematical modeling has made it possible to establish regularities of reduction of productivity of the gas-transport system and duration of the nonstationary process depending on the location of the compressor station on the route. With an increase in the number of shutdown compression stations, the degree of productivity decrease and duration of nonstationarity reduces The established patterns and proposed solutions will improve the reliability of a gas-transport system by preventing pipeline overload and reduce the cost of gas transportation by selecting running numbers of shutdown stations with a known decrease in productivity.
Highlights
The gas-transport system as a part of the trans-European gas complex is currently in the process of reforming and reorganizing its functional use
The root cause of this situation consists in a significant expansion of the Eurasian gas supply system having a throughput of its gas pipelines significantly exceeding the volume of production and consumption of natural gas on the continent which makes it possible to vary directions of gas flows
If the concentrated gas take-off is in the middle of the linear section of the gas pipeline, the maximum amplitude of pressure fluctuations at its beginning is 18.3 % less than in the case when the concentrated take-off is in the initial section of the gas pipeline
Summary
The gas-transport system as a part of the trans-European gas complex is currently in the process of reforming and reorganizing its functional use. The development of vital interests of mankind requires flexibility in the functioning of the gas supply system which primarily determines its operation modes with loading varying in time. Gas production from these reserves in combination with alternative sources of gas supply requires a significant adjustment of gas flows and constant changes in the system operation modes. In such conditions, the main principles of operation of the gas-transport complex should include reliability and energy efficiency. The main principles of operation of the gas-transport complex should include reliability and energy efficiency Realization of these principles requires the solution of a number of scien-. Energy-saving technologies and equipment tific and technical problems of optimization and forecasting nature
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