Page 13 - Advanced Gas Turbine Cycles

X Contents
6.5. A discussion of the basic thermodynamics of
these developments .............................. 103
6.6. Some detailed parametric studies of wet cycles ........... 105
6.7. Conclusions ................................... 107
References .................................... 107
Chapter 7 . The combined cycle gas turbine (CCGT) .............. 109

7.1. Introduction ................................... 109
7.2. An ideal combination of cyclic plants .................. 109
7.3. A combined plant with heat loss between two cyclic
plants in series ................................. 110
7.4. The combined cycle gas turbine plant (QCGT) ............ 111
7.4.1. The exhaust heated (unfired) CCGT ................... 112
7.4.2. The integrated coal gasification combined
cycle plant (IGCC) .............................. 114
7.4.3. The exhaust heated (supplementary fired) CCGT .......... 116
7.5. The efficiency of an exhaust heated CCGT plant .......... 117
7.5.1. A parametric calculation .......................... 118
7.5.2. Regenerative feed heating .......................... 122
7.6. The optimum pressure ratio for a CCGT plant ............ 123
7.7. Reheating in the upper gas turbine cycle ................ 126
7.8. Discussion and conclusions ......................... 128
References .................................... 129
Chapter 8 . Novel gas turbine cycles .......................... 131

8.1. Introduction ................................... 131
8.2. Classification of gas-fired plants using novel cycles ........ 132
8.2.1. Plants (A) with addition of equipment to remove the carbon 132
dioxide produced in combustion .....................
8.2.2. Plants (B) with modification of the fuel in
combustion-chemically reformed gas turbine
(CRGT) cycles ................................. 133
8.2.3. Plants (C) using non-carbon fuel (hydrogen) ............. 133
8.2.4. Plants (D) with modification of the oxidant in combustion .... 135
8.2.5. Outline of discussion of novel cycles .................. 135
8.3. COz removal equipment ........................... 136
8.3.1. The chemical absorption process ..................... 136
8.3.2. The physical absorption process ..................... 136
8.4. Semi-closure .................................. 139
8.5. The chemical reactions involved in various cycles ......... 140
8.5.1. Complete combustion in a conventional open circuit plant .... 140
8.5.2. Thermo-chemical recuperation using steam (steam.TCR) ..... 141
8.5.3. Partial oxidation ................................ 143