20.500.12556/DKUM-97286 Operational and thermodynamic methodology for integrating a gas–steam cycle into a legacy coal-fired power block Operativna in termodinamična integracija kombiniranega plinsko-parnega cikla v obstoječi premogovni blok This paper investigates the thermodynamic integration of a gas–steam combined cycle into an existing coal-fired power block with the objective of reducing coal utilisation and associated emissions. In the baseline configuration, the legacy unit relies entirely on pulverised coal combustion, whereas the retrofit concept introduces a natural gas-fired gas turbine with heat recovery steam generation. The recovered exhaust heat is used to supplement steam production for the existing steam turbine train, therebyincreasing the overall cycle efficiency and enabling partial fuel substitution. From an ecological perspective, natural gas presents a significantly lower carbon emission factor compared to coal, resulting in a proportional reduction of CO₂ and other greenhouse gas emissions at the system level. Additional benefits include lower NOₓformation due to cleaner combustion and improved operational flexibility, enabling more efficient load following under variable renewable penetration. The results suggest that such hybridisation offers a viable decarbonisation pathway for thermal assets by leveraging the existing infrastructure while achieving meaningful reductions in specific emissions. Ta prispevek preučuje termodinamsko integracijo kombiniranega plinsko-parnega cikla v obstoječi blok na premog z namenom zmanjšanja porabe premoga in povezanih emisij. V osnovni konfiguraciji obstoječa enota popolnoma temelji na zgorevanju mletega premoga, medtem ko retrofitna zasnova uvaja plinsko turbino na zrmrljski plin z rekuperatorjem pare. Izpušna toplota iz plinske turbine se uporablja za proizvodnjo pare za obstoječo parno turbinno, s čimer se poveča skupna učinkovitost cikla. Z ekološkega vidika zemeljski plin predstavlja bistveno nižji dejavnik emisij ogljika v primerjavi s premogom, kar povzroča sorazmeren upad emisij CO₂ in drugih toplogrednih plinov na ravni sistema. Dodatne prednosti vključujejo manjšo tvorbo NOₓzaradi čistejšega zgorevanja in izboljšano operativno fleksibilnost, kar omogoča učinkovitejše prilagajanje obremenitve ob spremenljivi integraciji obnovljivih virov. Rezultati nakazujejo, da takšna hibridizacija ponuja izvedljivo pot do dekarbonizacije termalnih virov z izkoriščanjem obstoječe infrastrukture, hkrati pa dosega pomembno zmanjšanje specifičnih emisij. natural gas power recovery steam turbine zemeljski plin elektrika predelava para turbina true false true Angleški jezik Slovenski jezik Neznano 2026-02-26 12:00:39 2026-02-26 12:00:39 2026-02-27 03:17:44 0000-00-00 00:00:00 2025 0 0 str. 213-230 Št. 4 Letn.18 dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-12-05 2025-12-16 2025-12-31 536 268883203 1855-5748 Operational_and_thermodynamic_me-Strusnik-2025.pdf Operational_and_thermodynamic_me-Strusnik-2025.pdf 1 BB649B857C0197078E3DDDAC882D0F74 2eebff72ba8651b83621c96a191c4f1c92d30f01649ec4110dd371d16c13ddd3 6e268ab2-1303-11f1-94ed-00155d580e1a https://dk.um.si/Dokument.php?lang=slv&id=203934 https://journals.um.si/index.php/jet/article/view/5786/3545 0 858dba1a-1303-11f1-94ed-00155d580e1a https://dk.um.si/Dokument.php?lang=slv&id=203935 Fakulteta za energetiko Univerzitetna založba Univerze v Mariboru Journal of energy technology 0 0 0