Exergy and Exergoeconomic Analyses of a Byproduct Gas-Based Combined Cycle Power Plant with Air Blade Cooling

Abstract

A combined cycle power plant (CCPP), which can use several kinds of byproduct gases as fuel, has attracted significant attention in the field of power generation due to their higher efficiency and lower environmental impact. Here, a simulation model of a 180 MW CCPP with air-film blade cooling was established using ASPEN HYSYS and analyzed from both exergy and exergoeconomic perspectives to evaluate the system performance in terms of exergy efficiencies and exergy destruction of the system and the economic costs of the process and analyze the effects of the system from different inlet air temperatures and ambient temperatures (15−15 model, 15−25 model, and 25−25 model). The production and residue cost distribution ratios were defined in the fuel and product table, which represents how the product of a given component is distributed among the other apparatuses, and whether it forms a final product or becomes a residue. The results show that the exergy efficiencies of the system are 48.69% (15−15), 48.32% (15−25), and 47.84% (25−25). The combustion chamber has the highest exergy destruction ratio among all components, and the turbine air cooler has the lowest exergy efficiency in the system. The unit exergoeconomic power cost of the CCPP is 0.0253 $/kW h (15−15), 0.0260 $/kW h (15−25), and 0.0266 $/kW h (25−25).