{"title":"The Delaying Influence of Degradation on the Divestment of Gas Turbines for Associated Gas Utilisation: Part 1","authors":"Mafel Obhuo, Dodeye I. Igbong, Duabari S. Aziaka, Pericles Pilidis","volume":162,"journal":"International Journal of Aerospace and Mechanical Engineering","pagesStart":249,"pagesEnd":256,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10011252","abstract":"<p>An important feature of the exploitation of associated gas as fuel for gas turbine engines is a declining supply. So when exploiting this resource, the divestment of prime movers is very important as the fuel supply diminishes with time. This paper explores the influence of engine degradation on the timing of divestments. Hypothetical but realistic gas turbine engines were modelled with Turbomatch, the Cranfield University gas turbine performance simulation tool. The results were deployed in three degradation scenarios within the TERA (Techno-economic and environmental risk analysis) framework to develop economic models. An optimisation with Genetic Algorithms was carried out to maximize the economic benefit. The results show that degradation will have a significant impact. It will delay the divestment of power plants, while they are running less efficiently. Over a 20 year investment, a decrease of $0.11bn, $0.26bn and $0.45bn (billion US dollars) were observed for the three degradation scenarios as against the clean case.<\/p>\r\n","references":"[1]\tI. Allison, \u201cTechno-economic evaluation of associated gas usage for gas turbine power generation in the presence of degradation and resource decline,\u201d \tunpublished, PhD thesis, Cranfield University UK, 2014.\r\n[2]\t2b1st Consulting, \u2018\u2018Associated gas\u2019\u2019, 2012. Available at: https:\/\/www.2b1stconsulting.com\/associated-gas\/ (Accessed: 17 Dec. 2017)\r\n[3]\tJ. Kearns et al., \u2018\u2018Flaring and venting in the oil and gas exploration and production industry: an overview of purpose, quantities, issues, practices and trends\u2019\u2019. International Association of Oil & Gas Producers, 2000. Available at: https:\/\/2ch417pds.files.wordpress.com\/2014\/04\/flaring-venting-in-the-oil-gas-exploration-production-industry.pdf (Accessed: 19 February 2018).\r\n[4]\tB. N. Anosike, \u201cTechnoeconomic evaluation of flared natural gas reduction and energy recovery using gas-to-wire scheme,\u2019\u2019 unpublished, PhD thesis, Cranfield University UK, 2013.\r\n[5]\tAccounting Tools Incorporation, \u2018\u2018Salvage value,\u2019\u2019 2017. Available at: https:\/\/www.accountingtools.com\/articles\/what-is-salvage-value.html (Accessed: 22 January 2018).\r\n[6]\tBureau of Economic Analysis \u2013 United States (2003), \u2018\u2018BEA depreciation estimates,\u2019\u2019 pp. 262-265, 1979. Available at: http:\/\/www.bea.gov\/national\/pdf\/fixedassets\/BEA_depreciation_2013.pdf.\r\n[7]\tA. E. Ogiriki, \u2018\u2018Effects of environmental factors on gas turbine engine creep life and performance,\u2019\u2019 unpublished, PhD thesis, Cranfield University UK, 2015.\r\n[8]\tM. Obhuo, \u2018\u2018Techno-economic and environmental risk assessment of gas turbines for use with flared associated gases,\u2019\u2019 unpublished, PhD thesis, Cranfield University UK, 2018.\r\n[9]\tAnosike, N., El-Suleiman, A., and Pilidis, P., (2016), Associated gas utilization using gas turbine engine, performance implication \u2013 Nigerian case study. Energy and Power Engineering, 8, 137-145.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 162, 2020"}