An overview of current and future sustainable gas turbine technologies

The Recovery of Exhaust Heat from Gas Turbines

“…The efficiency gain is about 10%, lower than that obtained with a conventional combined cycle, because the steam expands in a less efficient manner in the gas turbine than in the steam turbine. On the other hand, the power increase varies between 50 and 70% [12].…”

“…The water purification system required for large scale plant would represent about 5% of total capital costs, whereas running costs add about 5% to the fuel cost [12].…”

Gas Turbines in Unconventional Applications

“…In a system built some years ago and utilising a Rolls-Royce RB211 gas turbine installation of a Stirling engine allowed to increase the power output by 9 MW (from the original 27.5 MW). This increased the total efficiency Poullikkas (2005) to 47.7%. And advantage of such a solution is its compact form and simplicity of waste heat utilisation.…”

“…One of the interesting proposals presented in the literature is the so-called Brayton-Diesel system Poullikkas (2005).…”

Power enhancement of the Brayton cycle by steam utilization

“…These days, steam injection into a combustion chamber is employed in turbines of the leading companies, such as: General Electric, Rolls-Royce, Kawasaki [9,12]. In the work [16] it is shown that the STIG modification of a simple cycle gas turbine, the General Electric Frame 6B, can boost its efficiency from about 30 % to 40%, while the power output may increase from 38 to 50 MWe.…”