Exergoeconomic and Environmental Analysis and Multi-Objective Optimization of a New Regenerative Gas Turbine Combined Cycle

Ali Baghernejad,Amjad Anvari-Moghaddam

doi:10.3390/app112311554

Ali Baghernejad, Amjad Anvari-Moghaddam

Open Access

https://doi.org/10.3390/app112311554

Copy DOI

Abstract

Combined cycle systems have an important role in power generation. In the present study, three different configurations of combined Brayton and Rankine cycle system are studied from the perspective of energy, exergy, exergoeconomic and environmental perspectives. Results indicate that it depends on the preferences and criteria of each decision maker to select the best configuration among the three proposed configurations as the final configuration. For the purpose of parametric analysis, the effect of changing various parameters such as compressor pressure ratio, gas turbine inlet temperature on the output work, exergy efficiency, exergy-economic and environmental parameters is studied. In addition, an attempt is made to optimize the performance of combined cycle systems considering three objective functions of exergy efficiency, total cost rate and exergy unit cost of produced electricity.

Highlights

IntroductionThe most significant effects of this very high increase in atmospheric pollutants, much of which comes from fossil fuels can be attributed to ozone depletion, global warming, and greenhouse gases emission
Many efforts have been made to improve the performance of the Brayton and Rankine cycles so far but the most common of which is the combined cycle system, with the Brayton cycle acting as an upper cycle and using the turbine exhaust gas as an actuator for the Rankine cycle as a lower cycle
All equations related to the simulation of the combined cycle systems are simulated by EES software

Summary

Introduction

The most significant effects of this very high increase in atmospheric pollutants, much of which comes from fossil fuels can be attributed to ozone depletion, global warming, and greenhouse gases emission. Power generation cycles are one of the main sources of electricity generation, and today the combined Brayton–Rankine power generation cycles have received much attention due to their higher efficiency as well as less environmental pollution than the Brayton cycle and the Rankine cycle alone [1,2,3]. The combined cycle with the Rankine cycle has higher output and efficiency but the use of the gas Brayton-air Brayton combined cycle in hot and dry places where there is insufficient water to cool the condenser is a good choice [6]. The gas turbine outlet airflow and regenerator exhaust gas are still at a high temperatures, and can be used in various heating applications

Objectives

Methods

Results

Conclusion