Gas turbine efficiency and ramp rate improvement through compressed air injection

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dc.contributor.authorAbudu, Kamal
dc.contributor.authorIgie, Uyioghosa
dc.contributor.authorMinervino, Orlando
dc.date.accessioned2020-06-17T15:10:04Z
dc.date.available2020-06-17T15:10:04Z
dc.date.issued2020-06-15
dc.description.abstractWith the transition to more use of renewable forms of energy in Europe, grid instability that is linked to the intermittency in power generation is a concern, and thus, the fast response of on-demand power systems like gas turbines has become more important. This study focuses on the injection of compressed air to facilitate the improvement in the ramp-up rate of a heavy-duty gas turbine. The steady-state analysis of compressed airflow injection at part-load and full load indicates power augmentation of up to 25%, without infringing on the surge margin. The surge margin is also seen to be more limiting at part-load with maximum closing of the variable inlet guide vane than at high load with a maximum opening. Nevertheless, the percentage increase in the thermal efficiency of the former is slightly greater for the same amount of airflow injection. Part-load operations above 75% of power show higher thermal efficiencies with airflow injection when compared with other load variation approaches. The quasi-dynamic simulations performed using constant mass flow method show that the heavy-duty gas turbine ramp-up rate can be improved by 10% on average, for every 2% of compressor outlet airflow injected during ramp-up irrespective of the starting load. It also shows that the limitation of the ramp-up rate improvement is dominated by the rear stages and at lower variable inlet guide vane openings. The turbine entry temperature is found to be another restrictive factor at a high injection rate of up to 10%. However, the 2% injection rate is shown to be the safest, also offering considerable performance enhancements. It was also found that the ramp-up rate with air injection from the minimum environmental load to full load amounted to lower total fuel consumption than the design case.en_UK
dc.identifier.citationAbudu K, Igie U, Minervino O, Hamilton R. (2021) Gas turbine efficiency and ramp rate improvement through compressed air injection. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, Volume 235, Number 4, June 2021, pp. 866–884en_UK
dc.identifier.issn0957-6509
dc.identifier.urihttps://doi.org/10.1177/0957650920932083
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15502
dc.language.isoenen_UK
dc.publisherSAGEen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectFlexibilityen_UK
dc.subjectgas turbineen_UK
dc.subjectramp rateen_UK
dc.subjectpower augmentationen_UK
dc.titleGas turbine efficiency and ramp rate improvement through compressed air injectionen_UK
dc.typeArticleen_UK

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