Abstract
Energetic and exergetic analyses are conducted using operating data for Sabiya, a combined cycle power plant (CCPP) with an advanced triple pressure reheat heat recovery steam generator (HRSG). Furthermore, a sensitivity analysis is carried out on the HRSG using a recent approach to differentiate between the sources of irreversibility. The proposed system was modelled using the IPSEpro software and further validated by the manufacturer’s data. The performance of the Sabiya CCPP was examined for different climatic conditions, pressure ratios, pinch point temperatures, high-pressure steam, and condenser pressure values. The results confirmed that 60.9% of the total exergy destruction occurs in the combustion chamber, which constitutes the main source of irreversibilities within a system. The exergy destruction was significantly affected by both the pressure ratio and the high-pressure steam, where the relation between them was seen to be inversely proportional. The high-pressure stage contributes about 50% of the exergy destruction within the HRSG compared to other stages and the reheat system, due to the high temperature difference between the streams and the large number of components, which leads to high energy loss to the surroundings. Numerous possibilities for improving the CCPP’s performance are introduced, based on the obtained results.
Highlights
Power systems diagnosis is conducted, using thermal analysis tools, to determine the locations, magnitudes, and types of waste and losses within these systems
As energy analysis is unable to determine the irreversibilities within a thermal system, this successfully demonstrates the importance of exergy analysis, which allows for, and increases, the possibility of enhancing thermal systems, by using different modifications, to reduce the irreversibilities resulted from entropy generation [3,4]
The thermodynamic data were extracted from the cycle power plant (CCPP) model, developed by the IPSEpro software and validated with the manufacturer’s published data, and it presented a high level of compatibility
Summary
Power systems diagnosis is conducted, using thermal analysis tools, to determine the locations, magnitudes, and types of waste and losses within these systems. The primary analysis and assessment tools used in optimising the thermal energy systems are energy and exergy analyses [1,2]. A CCPP, with triple pressure HRSG system, was investigated, due to their high energy conversion efficiency, which is necessary in order to delay the depletion of non-renewable resources, by reducing fossil fuel consumption, through utilising and recovering part of the waste energy from a gas turbine engine. Numerous studies are available in the literature for CCPP, none have explored a triple pressure reheat HRSG using a real set of data based on exergy analysis. The aims of the present study are to analyse a very advanced CCPP, with a triple pressure reheat HRSG, using actual operating data from an energetic and exergetic perspective, which has not previously been considered in literature. In the context of the results, the study will introduce certain suggestions in order to improve plant performance
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