Page 193 - Advanced Gas Turbine Cycles

Chapter 8. Novel gas turbine cycles 159

OXYGEN FUEL (METHANE)
LIQUEFACTION

A

HRSG

COOLER

of reheat and three stages of compression are involved together with a recuperator. Carbon
dioxide and water vapour are the working gases but both the COz and H20 formed in
combustion are removed, the former through a complex compression and liquefaction
process. The multiple reheating and intercooling implies that such a cycle should attain
high efficiency, with ‘heat supplied’ near the top temperature and ‘heat rejected’ near the
bottom temperature, coupled with C02 removal.
Manfrida [4] calculated a thermal efficiency of 55% for this cycle at a maximum cycle
pressure of 250 bar and a combustion temperature of 1400°C.

FUEL (METHANE)

HEAT EXCHANGER
X - r WATER
SEPARATOR

LIQUID
coz

Fig. 8.23. Cycle D6. Matiant closed CICICBTBTBTX cycle burning methane with oxygen, and with COz
removal (after Manfrida 141).