Pilot-Scale Demonstration of a Novel, Low-Cost Oxygen Supply Process and its Integration with Oxy-Fuel Coal-Fired Boilers: Final Report Page: 74 of 206
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ADVANCED OXYGEN FIRING A COz CAPTURE RETROFIT STUDY OF
LINDF CERAMIC AUTOTHERMAL RECOVERY PROCESS AMFRICAN FLFCTRIC POWFR'S
CONESVILLE UNIT NO 5
In order to reflect the key performance parameters of the selected unit "as designed", the Black &
Veatch heat balance diagram was re-modelled and the following adaptations were made:
" During normal operation no steam is required to feed the steam coil air heaters (6.3 kg/s or
50,000 lb/hr). Therefore, this extraction flow is set to zero.
" Reheat de-superheater spray water flow rate of 11 kg/s (85,827 lb/hr) is to be used as
calculated in associated boiler performance computer simulation runs.
The final steam cycle for the Base Case is shown schematically in Figure 4-4. Figure 4-5 shows
the associated T-S and Mollier diagrams, which illustrate the process on temperature - entropy
and enthalpy - entropy coordinates respectively. The high-pressure turbine expands about 391
kg/s (3.1 x 106 lbm/hr) of steam at 175 bara (2,535 psia) and 538 C (1,000 F). Reheat steam is
returned to the intermediate pressure turbine at 41 bara (591 psia) and 538 C (1,000 F). These
steam conditions (temperatures, pressures) represent the most common steam cycle operating
conditions for existing utility scale power generation systems in use today in the US. The
condenser pressure used for the Base Case and all other cases in this study was 0.084 bara (2.5 in
Hga). The steam turbine performance analysis results show the generator produces an output of
463,478 kWe and the steam turbine heat rate is about 8,440 kJ/kWh (7,999 Btu/kWh).
The key parameters describing the Base Case are listed below:
" Live steam pressure 2,535 / 175 psia / bara
" Live steam temperature 1,000 / 538 F / C
" Live steam flow 3,131,619 / 395 lbm/hr / kg/s
" Steam for air pre-heating 0 / 0 lbm/hr / kg/s
" RH de-superheating spray 85,827 / 11 lbm/hr / kg/s
" Backpressure 2.5 / 0.084 in-Hg abs / bara
" Power output 463,478 kW
Alstom Power Inc A^"-st22 2008,
25
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Krishnamurthy, Krish; Acharya, Divy & Fitch, Frank. Pilot-Scale Demonstration of a Novel, Low-Cost Oxygen Supply Process and its Integration with Oxy-Fuel Coal-Fired Boilers: Final Report, report, September 30, 2008; United States. (https://digital.library.unt.edu/ark:/67531/metadc934636/m1/74/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.