Abstract
Purpose: The performance of a combined cycle cogeneration plant (CCCP) degrades with time owing to various causes. To solve this problem, the total turbine output of the CCCP must be improved. This paper proposes methods to improve the total turbine output of CCCPs by applying the Organic Rankine Cycle (ORC).<BR>Methods: Three models are proposed to apply ORC to a 120 MW CCCP. Case 1 uses pure waste heat from a heat recovery steam generator (HRSG) and residual heat from district heating. Case 2 uses the waste heat from the exhaust gas generated after heat exchange in a vapor power cycle. Case 3 is an integration of Case 1 and 2. Detailed conditions and additional outputs of each model are analyzed, and their actual applicability is analyzed through economic analysis.<BR>Results: Compared with the power output of the CCCP, the output range of Case 1 is 0.3%~1.6%, that of Case 3 is 2.5%~3.7%, respectively, and the output of Case 2 is 2.2%. All the models have actual applicability.<BR>Conclusion: For CCCPs, additional power and economic value can be generated by selecting an appropriate ORC model according to the conditions of the target plant.
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