Examples on Gas Turbine Engineering
Intercooled Steam-Injected Cycle GT is Superior to GT-Steam Combined Cycle for GT Generating Plant
- Powerful & Efficient by Equivalent Max Temp. in Steam Cycle as in GT Cycle
- Much Less NOx Emission to Dry Combustion GT-Steam Combined Cycle
- Much Less Power Reduction in Hot Climate to GT-ST Combined Cycle
100% power output & 50% efficiency improvements are attainable by water-spray intercooling between compressors and steam injections to combustor & turbines. Aero-derivative type would be easier to modify into such configuration than heavy-duty type, from viewpoints of multi-shaft structure.
Applying to leading Aero-GT LM6000
- Power ouput Increased from 41MW to108MW
- Efficiency Improved from 42% to 56%
Applying to future Aero-GT GE90
-Power output Increased from 59MW to 169MW
- Efficiency Improved from 43% to 63%
References: ASME98-GT-117, ASME98-GT-118, ASME99-GT-327, NEDO P-9608
Closed Cycle GT is Most Suitable Candiate for Recovering Wasted LNG Cryogenic Heat than Existing Systems
- Cycle maximum temp. can be generated by exhaust gases without combustion
- Environmentally friendly system due to no additional CO2 nor NOx Emissions
- High efficiency possible applying pseudo ideal Ericsson Cycle
Helium would be best working fluid, however, air is a practical alternate from viewpoints of existing technology application & make-up for leakage. 37% efficiency GT system is designed, setting suction temp. as 157K considering stored LNG temp. of 110K and maximum temp. as 550K by utilizing exhaust gases. This efficiency level is superior to that of conventional steam bottoming cycle.
Applying to existing 1,000MW class LNG-based generating station
- Power output 16MW
- Efficiency 37%
Heat supply from partial flue gas from GT exhaust(773K)
- Power output 26MW
- Efficiency 37%
References: AIChE99 Spring Meeting 115c, 118e, ASME00-GT-166