4E analysis of integrated MHD-combined cycle

Abstract

In recent years, there have been increasing studies on topping cycles of combined cycle power plants with very high working temperature (about 3000 K). One of the thermal cycles, which have the ability to work in this temperature range, is MHD-Magneto hydrodynamic- cycle. MHD cycle can operate in two states. One state is the open cycle, and the other one is the close cycle. In both mentioned states there is a large amount of waste heat that can be recovered. It seems that the use of recovered heat from MHD cycles as the heat source for a gas turbine cycle namely Brayton according to their working temperature is promising. The objective of this study focused on energetic, exergetic, exergoeconomic and environmental (4E) analysis and evaluation of a proposed cycle based on the integration of combined cycle with MHD generator as the topping cycle. In this regard, the thermodynamic simulation of the plant has been performed. To verify of the thermodynamic simulation, the results have been compared with Thermoflex software and the data in the literature. In addition, exergetic, exergoeconomic, and environmental modeling and evaluation have been performed through computer code. The results show the good accuracy of the thermodynamic simulation for the integrated system. Also, the proposed cycle has a higher efficiency with the lower cost of exergy destruction and lower emission.