June 3, 2010
CSL to fit CSNOx exhaust gas scrubber in Great Lakes vessel
Canada Steamship Lines (CSL) has signed a Letter of Intent with Singapore-headquartered Ecospec Marine Technology covering installation of Ecospec's CSNOx gas scrubbing technology on one of CSL's Great Lakes' vessel later this year.
In the CSNOx system, the pH value and alkalinity of scrub water is corrected prior to scrubbing using an ultra-low frequency electrolysis system (ULFELS). Seawater goes through an additional antifouling pretreatment to control microbial growth in the system. The alkaline water is then pumped through the exhaust stack to scrub the flue gas. Ecospec says that CSNOx treated water is highly reactive and effective in removing CO2, SO2 and NOx through absorption and that the removed pollutants are converted into the harmless substances found naturally in water. After scrubbing, the scrubbed water may pass through a solid-liquid separator to remove solid particles. The recovered water will then undergo an integrated treatment to meet the discharge water standard. If the water supply is limited, the scrubbed water can be further treated and recycled back to the scrubbing process, reducing the amount used.
The CSL CSNOx installation will be the world's first on a vessel operating in a fresh water environment.
Ecospec claims that CSNOx is the world's first commercially viable solution that can effectively reduce SO2, NOX and CO2 emissions from large ocean trading vessels with all three gases being removed in one process and in a single system, without using harmful chemicals.
More importantly, CSNOx is claimed to be the only marine exhaust gas abatement process capable of offsetting and net reduction in CO2 emission trails. This is contrast to conventional scrubbers that increase CO2 emissions as a result of chemical reactions in the scrubbing process, or because they may not have the capability to offset CO2 emissions by the additional energy used.