Analysis of the performance of the compressor impeller during the transportation of natural gas and gas-hydrogen mixture

Kostiantyn Kapitanchuk, Dmytro Shkliaruk

Abstract


The research object is the impeller of a centrifugal compressor used in gas-pumping units of main gas pipelines under conditions of transporting natural gas and its mixtures with hydrogen. This study aims to determine the impact of hydrogen addition to natural gas on gas-dynamic parameters and compressor efficiency and to assess the operating limits of existing equipment. The research objectives include: investigating changes in the fundamental physicochemical properties of gas with hydrogen addition; performing mathematical calculations for compressor operating modes at hydrogen concentrations of 0%, 5%, 10%, 15%, and 20% H₂; conducting Computational Fluid Dynamics (CFD) analysis of the gas flow in the impeller using ANSYS CFX for different hydrogen concentrations; comparing the obtained results; and determining the influence of gas composition on compressor parameters (pressure, temperature, velocity, efficiency, etc.). The following methods were used for solving the tasks: analytical calculation (using Mathcad software) and numerical-experimental method (CFD modeling in ANSYS CFX). Obtained results: An increase in the hydrogen volumetric fraction significantly reduces the gas density, causing a decrease in the compressor’s generated pressure, temperature, and efficiency. The rising hydrogen content shifts the compressor’s operating point toward higher flow rates and closer to surge conditions, narrowing the stable operation region by approximately 30% at 20% hydrogen concentration. Conclusions. The addition of hydrogen to natural gas significantly affects the performance of centrifugal compressors by reducing gas density, lowering efficiency, and limiting the stable operating range. To ensure stable operation during transportation of gas-hydrogen mixtures, adjustments in compressor operation modes-specifically, increasing flow rates or rotational speed, are necessary. The results obtained allow evaluation of existing equipment limits and provide recommendations for modernization to enable efficient transportation of gas-hydrogen mixtures.

Keywords


centrifugal compressor; compressor impeller; natural gas; gas-hydrogen mixture; hydrogen concentration; CFD modeling; ANSYS CFX; gas-dynamic parameters; efficiency; surge region; gas transportation

References


Andriyishyn, M., Kapitanchuk, K., & Andriyishyn, N. Vyznachennya efektyvnosti roboty hazopere-kachuval'noho ahrehatu kompresornoyi stantsiyi za danymy yiyi ekspluatatsiyi [Determining the efficiency of the gas transmission and pumping unit of a compressor station based on its operation data]. Naukoyemni tekhnolohiyi, 2021, vol. 1, no. 49, pp. 49–56. (In Ukrainian).

Dong, J., Song, B., & Yuan, X. Research on aerodynamic performance of centrifugal compressors for hydrogen-mixed natural gas. PLoS ONE, 2024, vol. 19, no. 10. 17 р. doi: 10.1371/journal.pone.0312829

Hydrogen-fueled gas turbines. GE Gas Power, 2023. Available at: https://www.ge.com/gas-power/future-of-energy/hydro-gen-fueled-gas-turbines (accessed 10 October 2023).

Seredyuk, M. Hazodynamichni rezhymy ekspluatatsiyi hazovykh merezh nyz'koho tysku pry transportuvanni hazo-vodnevykh sumishey [Gas-dynamic operating modes of low-pressure gas networks when transporting gas-hydrogen mixtures]. Internauka, 2021, vol. 1, pp. 52-62. doi: 10.25313/2520-2057-2021-1-6822. (In Ukrainian).

Adam, P., Bode, R., & Groissboeck, M. Readying pipeline compressor stations for 100 % hydrogen. Turbomachinery Magazine, 2020, vol. 61, no. 6. Available at: https://www.turboma-chinerymag.com/view/readying-pipeline-compressor-stations-for-100-hydrogen (accessed: 15.05.2025).

Melaina, M., Antonia, O., & Penev, M., Blending hydrogen into natural gas pipeline networks: A review of key issues. National Renewable Energy Laboratory, 2013, 160 p.

Andriishyn, M., Kapitanchuk, K., & Kozlov, V. Kompresorni stantsiyi mahistral'nykh hazo-provodiv: metodychni rekomendatsiyi do vykonannya kursovoho proektu [Compressor stations of main gas pipelines: methodological recommendations for the implementation of a course project]. Kyiv, NAU Publ., 2018. 60 p. (In Ukrainian).

Andriishyn, M., Kapitanchuk, K., & Andriishyn, N. Doslidzhennya vplyvu hazo-vodnevoyi sumishi na hazotermodynamichni parametry roboty hazopere-kachuval'noho ahrehatu kompresornoyi stantsiyi [Study of the influence of a gas-hydrogen mixture on the gas-thermodynamic parameters of the gas-pumping unit of a compressor station]. Naukoyemni tekhnolohiyi, 2023, vol. 57, no. 1, pp. 77-85. doi: 10.18372/2310-5461.57.17447 (In Ukrainian).

Kapitanchuk, K., Andriishyn, M., & Shkliaruk, D. Analiz mozhlyvosti transportuvannya hazo-vodnevoyi sumishi cherez hazotransportnu systemu [Analysis of the possibility of transporting a gas-hydrogen mixture through the gas transportation system]. XXIV Mizh. nauk.-tekh. konf. “Promyslova hidravlika i pnevmatyka” [XXIV International Scientific and Technical Conference “Industrial Hydraulics and Pneumatics”]. Kyiv, 2024, pp. 53-56. (In Ukrainian).

Andriishyn, M., Kapitanchuk, K., & Shkliaruk, D. CFD-analiz chysel'noho modelyuvannya protsesu stysnennya hazo-vodnevoyi sumishi v vidtsentrovykh kompresorakh pry transportuvanni [CFD analysis of numerical modeling of the compression process of a gas-hydrogen mixture in centrifugal compressors during transportation]. ХVІІ Mizh. nauk.-tekh. konf “Dvyhuny ta enerhetychni ustanovky” [XVII International Scientific and Technical Conference “Engines and Power Plants”]. Kyiv, 2025, pp. 6.33–6.37. (In Ukrainian).




DOI: https://doi.org/10.32620/aktt.2025.4sup1.06