Page 199 - Advanced Gas Turbine Cycles

164 Advanced gas turbine cycles

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0
0 I 2 3 4 5 6 7 0 9
CARBON DIOXIDE TAX - CENTSlkg
Fig. 8.28. Electricity price variation with carbon tax for (i) IGCC plant and (ii) IGCC plant with extra shift and
C02 removal (after Chiesa and Consonni [3]).

The novel cycles are:
(i) a natural gas-fired open CCGT plant with ‘end of pipe’ C02 removal at low pressure
(Cycle Al); and
(ii) a natural gas-fired semi-closed CCGT plant with C02 removal by chemical
absorption at low pressure (Cycle A2).
Fig. 8.28 shows a similar plot for coal fired IGCC plant with and without C02 removal
(by extra shift reaction and C02 removal at high pressure (Cycle Fl)).
Clearly, the carbon dioxide tax will be a dominant factor in future economic analyses
of novel cycles. It would appear that a tax of about 3 c/kg of C02 produced would make
some of the C02 removal cycles economic when compared to the standard basic cycles.

References
111 Chiesa, P. and Consonni, S. (2000). Natural gas fired combined cycles with low C02 emissions, ASME J.
Engng Gas Turbines Power 122(3), 429-436.
[21 Corti, G. and Manfrida G. (1998). Analysis of a semi-closed gas turbindcombined cycle (SCGTKC) with
CO2 removal by amines absorption, International Conference On Greenhouse Gas Control Technologies,
Interlaken.
131 Chiesa, P. and Consonni, S. (1999). Shift reaction and physical absorption for low emission IGCCs, ASME
J. Engng Gas Turbines Power 121(2), 295-305.