Reducing Energy Costs for Gas Preheating through Gas-Dynamic Stratification in the Leontiev Tube
The main objectives of this study are to reduce the energy consumption for gas preheating and improve the efficiency of compression systems using gas-dynamic temperature stratification in the Leontiev tube. In order to achieve these objectives, the following tasks were carried out: a numerical analy...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Academy of Sciences of Moldova
2025-05-01
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| Series: | Problems of the Regional Energetics |
| Subjects: | |
| Online Access: | https://journal.ie.asm.md/assets/files/11_02_66_2025.pdf |
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| Summary: | The main objectives of this study are to reduce the energy consumption for gas preheating and improve the efficiency of compression systems using gas-dynamic temperature stratification in the Leontiev tube. In order to achieve these objectives, the following tasks were carried out: a numerical analysis was performed using the finite volume method (RANS) and the k–ω SST tur-bulence model, and the Navier–Stokes equations were discretized on a multi-block mesh of 3 million cells, with local refinement in the nozzle and separation wall zones. Particular attention was paid to the influence of the inlet nozzle geometry on the temperature distribution, flow ve-locity, and heat transfer through the separation wall, as well as the stability of the flow under different pressure differentials. The most significant results include the superior performance of the bell-shaped nozzle design over the annular one: modelling showed a 60 K temperature dif-ference between supersonic and subsonic flows (110.5% higher than the baseline), a 20–25 K increase in hot flow temperature at the outlet, stable flow without pressure surges, and effective gas heating prior to throttling using pipeline pressure drops, preventing condensation and reduc-ing costs. The significance of these results lies in demonstrating the superiority of machine-free energy separation technologies, such as gas-dynamic stratification in the Leontiev tube with a bell-shaped nozzle, over traditional energy-intensive heating methods, leading to more rational resource utilization and reduced environmental impact under strict energy efficiency and ecolog-ical standards. |
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| ISSN: | 1857-0070 |