The new emission control challenge
To reduce SO2, NOx and CO2 all three gases in one go, not just one.
Any technology available ?
Process Flow
ULFELS energized seawater spray
ULFELS seawater energizing tank Untreated seawater
Wash water
Clean water
Cyclone separator
Sludge to tank
or decanter
Overboard discharge
Seawater intake
Test Results released on 16th Jan 09
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UNTREATED seawater
Vessel : Coral Sea
Owner : Tanker Pacific
Test date : December 2008
Built : 2003
DWT : 105,666
Exhaust Source : Boiler
CSNOx TREATED seawater
Before
Scrubbing
After Scrubbing
Efficiency
SO2 (ppm)
802.5
665.6
NOx (ppm)
183.7
188.2
CO2 (%)
5.12
5.25
17%
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* Fuel combustion @ 1.25 ton/per hour.
* Fuel sulphur content @ 2.5 ~ 3% * Comparison based on same amount of water spray
Before
CSNOx
After CSNOx
Efficiency
SO2 (ppm)
669.3
47.4
NOx (ppm)
158.5
28.2
CO2 (%)
5.16
1.32
92.9%
82.2%
74.4%
System Installation
Alkaline water tank
Scrubber
Spray Nozzles
Boiler
Typical Demo Rig Result
Exhaust after CSNOx
SO2 = 0 ppm
NO = 83 ppm
NO2 = 12 ppm
CO2 = 1.40 %
Seawater intake pH 7.9 ~8.1
ULF coil
ULFELS energized seawater
Electrodes
CSNOx reactor
pH 9.5 ~10
Untreated seawater
Generators
100 + 300 KVA
Engine
exhaust
pH = 7.9 ~ 8.1, alkalinity = 10 ppm
Wash water pH = 7.8 Alkalinity = 160 ppm
Nitrate = < 1 ppm
PAH < 1 ppb
Wash water From stage 2
pH = 8.3
Wash water From stage 1
pH = 6.5
Exhaust before
CSNOx
SO2 = 195 ppm
NO = 260 ppm
NO2 = 21 ppm
CO2 = 2.80 %
Further work
• Testing on exhaust from main engine of an Aframax tanker in partnership with Tanker Pacific
• To be witnessed and verified by American Bureau of Shipping Maritime and Port Authority, Singapore (as part of the SOx Type Approval process)
In short, is
• a 3‐in‐1 system capable of removing SO2, NOx and CO2 in one go
• able to meet current MEPC 170(57) (as amended) requirements for SO2 scrubbing