for the proposed 800 MW Combined Cycle Power Plant ...

CO 2 Capture Study
For 800 MW Power Plant – Tjeldbergodden
Seawater
Coolant Te/hr In 36,750 18
2.7 @ Booster
Pump Discharge
Seawater
Coolant
Te/hr Out 36,750 28
Low Pressure
Steam Te/hr In 424.4 148 3.5
Medium
Pressure Steam
Condensate
Nitrogen
Instrument Air
CB2005-0022_Final Report.Doc
ATM @ 7m
elevation
Te/hr In 24.1 (Note 1) 161 5.4
Te/hr Out 424.4 147 7.2
Nm 3 /hr In 4,839 30 7.0
Nm 3 /hr In 122 30 7.0
Notes:
1) Medium Pressure Steam is required intermittently towards the end of the reclaiming cycle
(8-12 hours per month).
2) Pressure drop across water cooled exchangers = 0.7 BAR. Add additional 0.6 BAR for
variable loss. Pressure loss in inlet lines allowance = 0.7 BAR. Elevation of outlet weir
box taken as 7 meters.
3.7 Power Plant Pre-investment
It is anticipated that limited pre investment would be required in the Power
plant to accommodate the carbon capture plant. Main pre investment would
be in the specification of the HRSG and the steam turbine where a change to
the specification of the equipment is best accommodated prior to purchase.
Recommended changes to the specification are as follows.
Qualifications to HRSG Specification to facilitate addition of Carbon Capture
`Plant
1. Steam Extracted form the crossover form the IP to LP sections of the
turbine should be arranged to be at 4.6 Bar (a) at the turbine, so as to suit
the temperature requirement of the carbon capture plant.
2. Low pressure steam supply to the Carbon Capture Plant is to be supplied
from the boiler drum plus extraction for the IP/LP crossover of the steam
turbine. It will be desuperheated to near saturation conditions using an
enthalpy controlled desuperheater. (See attached sketch at the end of this
section.)
3. No provision for a LP superheater is needed
4. Preferred configuration of the HRSG is horizontal to enable the ductwork
to the Carbon Capture plant to be arranged for minimum pressure loss
5. Space provision should be made so that the structure of the HRSG can
have a diverter damper installed at a later date, which will divert flue gas
from the stack to the future Carbon Capture Plant
Qualifications to Steam Turbine Specification to facilitate addition of Carbon
Capture Plant
1. Pressure at the IP/LP crossover to be 4.6 bar(a)
2. The turbine is to be constructed to enable the later addition of controlled
steam extraction from the IP/LP crossover.
3. The actual LP steam pressure supplied should be controlled at the turbine
to meet the load on the carbon capture plant