ES precept 5

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Precept 5: Repowering of a cogeneration plant Mechanical Engineering - Energy Systems Authors: •Group xx: xxxxx xxxxx (xxxxxxxx), F abio Santoro (xxxxxxxx) Lecturer:Prof. Stef ano Consonni T eaching Assistants:Riccardo Cremona, Hamidreza Heydari and Nima Razmjoo Academic year:2025-2026 Contents 1 Description 2 2 Configuration A 4 2.1 Performance indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Configuration B - solution 5 3.1 HP HRSG section + HP turbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 LP HRSG section + Attemperator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.3 LP turbine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.4 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.5 Extraction pump, LP feedwater pump and HRSG exit . . . . . . . . . . . . . . . . . . 8 3.6 Numerical results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.7 Performance indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 References 12 1 Energy Systems - Report Precept 5 - Group xx 1. Description The scope of these precept is to evaluate the feasibility for structural conversion of a power plant. The existing plant consists in a steam cycle electric power generation plant where the steam is provided by a boiler as represented in Figure 1. Figure 1: Existing plant scheme In the new solution (Figure 2), we manage to replace the boiler and its auxiliary devices with a gas cycle that produces electricity. The hot flue gases then enter the heat recovery steam…