It should be mentioned that in an attempt to reduce plant complexity,
wet cycles have been studied in which gas and steam are expanded in the same turbine(Barlett, 2002).
There are numerous variants of concepts for wet cycles;
for instance, the steam-injected gas turbine shown in Figure 10.13.
Steam generated in the HRSG is introduced in the turbine inlet together with the combustor exhaust gases.
Water vapour is then condensed from the exhaust gas and returned into the steam cycle in which steam is generated from the exhaust gas heat.
This puts high requirements on a condenser that can handle non-condensable gases as well as
steam.
In addition, water treatment becomes crucial because water is recirculated and might be contaminated by the gaseous exhaust gases depending on the air and fuel quality.
Add to that, the high pressure and the steam-rich atmosphere in the gas-turbine core components will require design adaptations or even development efforts.