A Thermodynamic Analysis of Two Competing Mid-Sized Oxyfuel Combustion Combined Cycles

Table 7

Results for the optimal cycles.

		Reference	SCOC-CC	Graz
Heat input	MW	176	167	169
GT power output	MW	69	62	76
GT efficiency	%	39.48	37.08	45.18
ST power output	MW	31	38	24
ST efficiency	%	17.35	22.86	14.00
Gross power output	MW	100	100	100
O2 production	MW		10.3	10.4
O2 compression	MW		6.91	5.98
CO2 compression	MW		3.60	3.79
Net power output	MW	98.6	77.0	78.0
Gross efficiency	%	56.83	59.94	59.18
Net efficiency	%	56.04	46.16	46.16
Compressor pressure ratio		26.2	57.3	36.5
Compressor outlet temp	°C	507	474	605
Compressor mass flow at inlet	kg/s	181	149	73
Cooling mass flow ratio		0.22	0.35	0.17
TET	°C	1400	1450	1450
TIT	°C	1251	1208	1274
Power TET	°C	850	927	998
Exhaust gas flow	kg/s	185	166	106
Exhaust temperature	°C	526	618	614
Stack temperature	°C	96	65	100
LP steam pressure	bar	7	7	7
LP steam temperature	°C	337	337	337
LP steam mass	kg/s	7	3	3
HP steam pressure	bar	140	140	140
HP steam temperature	°C	501	560	560
HP steam mass	kg/s	21	27	26
O2 mass flow	kg/s		14.0	14.2
CO2 mass flow	kg/s		10.3	10.8

Same as combustor outlet temperature (COT).
Turbine inlet temperature based on the ISO definition.