Thermoeconomic Study of a Multigeneration System with Waste Heat Recovery from a Gas Turbine

The growing demand for energy and the associated crisis present a major global challenge. As a result, there is an increasing shift towards the adoption of renewable energy sources. One effective strategy to reduce fossil fuel consumption is to capture heat from the exhaust gases produced by gas turbines. This approach not only reduces fuel consumption but also lowers carbon dioxide emissions, contributing to environmental protection. A study was conducted to evaluate the energy, exergy, and exergoeconomic aspects through a simulation of a combined cycle system, which integrated a steam Rankine cycle (SRC) and an organic Rankine cycle (ORC) to utilize waste heat from gas turbines. Freshwater and hydrogen were produced using a reverse osmosis (RO) unit and a proton exchange membrane (PEM) electrolyzer. The impact of varying system parameters on performance factors was thoroughly investigated. System analysis was conducted using EES software. The results showed that the initial energy efficiency and overall exergy values were ۲۴.۹۲% and ۱۵.۰۱%, respectively, with an output work of ۳۲۰,۴۱۲.۸ kW. Additionally, replacing the SRC and ORC condensers with two thermoelectric generator (TEG) units resulted in an additional power output of ۵,۰۴۶.۸ kW. Exergy destruction rate assessments indicated that the gas turbine (GT) and SRC cycles exhibited the highest levels of exergy destruction.

کلیدواژه ها:

GT cycle ، Waste heat ، economic analysis ، Rankine cycle