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

CO 2 Capture Study
For 800 MW Power Plant – Tjeldbergodden
HSS are removed from the system using thermal reclaiming. The expected
amount of reclaimer waste and a typical waste composition as follows.
Table 2
Reclaimer Waste
Expected Amount Tonnes/yr 2,300
Composition
MEA %wt 15
Water %wt 7
MEA Degradation Products %wt 75
Inorganic Residue %wt 3
3.5.3 DCC Excess Water
The hot flue gas from the Heat Recovery Steam Generators must first be
cooled to the operating conditions of the EFG+ plant to minimize amine
degradation. The gas is cooled in the Direct Contact Cooler (DCC) by a
circulating water stream. By lowering the gas temperature, much of the water
vapor contained in the flue gas is condensed and separated from the feed
upstream of the absorber. The condensed water from the flue gas is taken
out of the DCC with the hot circulating water. A slip stream of excess water is
taken from the circulating water stream to maintain the water balance around
the DCC. This DCC excess water contains some dissolved carbon dioxide
and is combined with the cooling water return. The expected amount of DCC
excess water is shown in table 3.
Table 3
DCC Excess Water
Expected Amount m 3 /hr 116.4
pH pH 5.0 – 5.5
It is proposed that this water be used as demineralized plant make-up after
degassing the carbon dioxide.
3.6 Process Utility Interfaces
The following table provides a listing of Power plant utility interfaces with
relevant stream information.
ECONAMINE FG PLUS SM INTERFACE TABLE
Commodity Unit In/Out Flow Temp.
(°C)
Pressure
BAR(G)
PROCESS
Flue Gas
Vent Gas
CO 2 Product
DCC Excess
Water
1000 m 3 /hr
(actual)
1000 m 3 /hr
(actual)
m 3 /hr
(actual)
Te/hr
In 5,090 80 0.0
Out 4,231 37 0.0
Out 90,361 25 0.6
Out 115.5 42 2.5
UTILITIES
Demin Water Te/hr In 55.2 40 7.0
CB2005-0022_Final Report.Doc