1. Introduction - Firenze University Press

GateCycle TM software. The built-in components were used to build the integrated model. It was
assumed that through the membrane flows pure oxygen. The auxiliary power rate of steam cycle,
the live steam thermodynamic parameters, reheated steam thermodynamic parameters, mass flow
rates of live steam and reheated steam were assumed as for a 460 MW power plant. The gross
power of steam turbine is constant, despite electricity generated in the air separation unit.
Energy consumption of the carbon dioxide capture unit was calculated with use of the model of
carbon dioxide capture unit. The structure of this model is shown in Figure 3. The energy
consumption value is correct for the specific composition of the flue gas.
Rys.3. Scheme of the carbon dioxide capture unit (CC)
3. The results of calculations of air separation unit integrated
with the oxy type pulverized boiler
The air mass flow rate depends on the separated in membrane oxygen mass flow rate ( m O2 ), oxygen
recovery rate (R) and mass content of oxygen in the air ( g O2air
). The relationship between these
quantities is as follows:
m
O2
m
1a
(1)
R
g
O2air
Next the air is flowing to the compressor. Effective power required to drive the compressor depends
on the air mass flow rate ( 1a m ), the air temperature ( ~c 1a
), the
255
T ), the average specific heat ( p K
1
compressor pressure ratio ( K ), the heat capacity ratio contained in the factor ( K
),
K
the compressor isentropic efficiency ( iK ) and the compressor mechanical efficiency ( mK ). The
equation showing the relationship between these quantities is as follows:
N m
eK
1a
K
~
K 1
c T
p
K
1a
iK
mK
(2)
The mass flow rate of gas flowing through the expander is lower than the mass flow rate of gas
flowing through the compressor. This mass flow rate depends on the oxygen mass flow rate
separated from the air in the membrane ( m O2 ) and the air flow rate ( m 1a ).The relationship between
these quantities is as follows:
m m
m
4a
1a
O2
(3)
The expander effective power depends on the retentate mass flow rate ( a m 4 ), the retentate
temperature ( T 4a ), the average specific heat (~c p ), the compressor pressure ratio (
K
K ), the
reduction factor of compressor pressure ratio ( ), the heat capacity ratio contained in the factor
1
( T ), the expander isentropic efficiency ( iT ) and the expander mechanical efficiency
T
). The equation showing the relationship between these quantities is as follows:
( mT