Abstract
In the first part of this investigation, a Natural Gas Combined Cycle (NGCC) producing 620 MW of electricity was simulated using the commercial software Aspen Hysys V9.0 and the Soave-Redlich-Kwong (SRK) equation of state. The aim of this second part is to use exergy-based analyses in order to calculate its exergy efficiency and evaluate its environmental impact under standard conditions. For the exergy efficiency, the performance index under investigation is the exergy destruction ratio (yD). The results of the study show that the combustor is the main contributor to the total exergy destruction of the power plant (yD = 24.35%) and has the lowest exergy efficiency of 75.65%. On the other hand, the Heat Recovery Steam Generator (HRSG) has the lowest contribution to the exergy destruction (yD = 5.63%) of the power plant and the highest exergy efficiency of 94.37%. For the overall power plant, the exergy efficiency is equal to 53.28%. For the environmental impact of the power plant, the relative difference of exergy-related environmental impacts (rb) is utilized as the performance index for each equipment of the plant and the environmental impact of a kWh of electricity (EIE) is used to represent the performance index of the overall power plant. In agreement with the exergy analysis, the results indicate that the combustor and the HRSG have respectively the highest (rb = 32.19%) and the lowest (rb = 5.96%) contribution to the environmental impact. The environmental impact of a kWh of electricity of the power plant is 34.26 mPts/kWh (exergy destruction only), and 34.42 mPts/kWh (both exergy destruction and exergy loss).
Highlights
The Government of the UAE aspires to reduce CO2 emissions by capturing carbon dioxide from industrial emitters and transporting the CO2 to oilfields for Enhanced Oil Recovery (EOR)
In agreement with the exergy analysis, the results indicate that the combustor and the Heat Recovery Steam Generator (HRSG) have respectively the highest and the lowest contribution to the environmental impact
The main objective of this study was to evaluate the performance of an Natural Gas Combined Cycle (NGCC) power plant by calculating its efficiency and evaluate its environmental impact using exergy based analyses
Summary
The Government of the UAE aspires to reduce CO2 emissions by capturing carbon dioxide from industrial emitters and transporting the CO2 to oilfields for Enhanced Oil Recovery (EOR). In order to demonstrate and test this concept, Abu Dhabi Company for Onshore Oil Operations (ADCO) recently implemented a pilot-scale CO2 Enhanced Oil Recovery in one of its onshore oil fields. This is the first CO2-EOR flood implemented in the Middle East [1]. The cost of CO2 capture from natural gas fired power generation plants is high due to the fact that a large amount of energy is needed in the stripper in order to obtain leaner amine solutions needed for the lower concentrations of carbon dioxide in the flue gas. The recirculated flue gas is utilized as the secondary air (dilution air) to cool down the blades of the turbine
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