Energy and exergy analysis of a cogeneration system textile painting process

In this thesis, energy and exergy analysis of a cogeneration power plant established to meet the steam and electricity needs of a textile factory in Kahramanmaraş was carried out. In this analysis, performance evaluation was done by examining interactions among the units in system and their environment. In a cogeneration plant where natural gas is used as fuel, electricity is produced by an internal combustion engine. Steam is produced by transferring the heat of the flue gases by motor to a waste heat boiler. The steam that is produced, is used for textile dyeing process. As a result of the energy and exergy analyses been done, the energy loss of the cogeneration plant was calculated as 13098.7 kW, energy yield as 68.9%, exergy loss as 7018.74 kW and exergy yield as 56.48%. The yield expressions obtained are compared to the ones in the catalog prepared by the manufacturer. In the cogeneration plant, the unit with the highest energy efficiency is water circulation pump number 2 (P2) with 99.76% and the lowest is economiser with 3.8%. The unit with the highest exergy efficiency is the water circulation pump number 2 (P2) with 96.91% and the lowest is economizer with 3.33%. In the cogeneration plant, it is observed that the unit with the highest loss of energy and exergy is turbocharged with 8083.42 kW. The unit with the lowest energy loss is the P3 with 2.2 kW, and the unit with the lowest loss of exergy was P4 with 2.18 kW. In the cogeneration plant where the analyses performed, it is concluded that the loss of energy and exergy is high in the engine and engine related systems (Turbocharger, heat exchanger (ID) and waste heat boiler (AIK)). Key words: Thermodynamics, cogeneration, energy analysis, exergy analysis, efficiency