Compact exhaust gas scrubber gets DNV approval

Written by Nick Blenkey

greenmarineJULY 20, 2012 — A Green Tech Marine GTM R15 compact exhaust gas scrubber recently installed onboard Royal Caribbean International’s cruise ship Liberty of the Seas has now received a MARPOL “Statement of Compliance” certificate from DNV.

The measurements of exhaust gas emission and wash water criteria have been shown to be well below the required limits stated in the MEPC guideline 184(59). This will ensure the vessel is compliant with the 0.1 percent sulfur limit that will be required in ECAs from 2015.

Beyond the efficient removal of SOx and other particles, the GTM R15 offers a number of advantages over other scrubbers, such as its minimal footprint requirement and low weight. It is also energy efficient, requiring virtually no external chemicals and allowing for installation during operation.

The GTM R15 that Green Tech Marine and Royal Caribbean are pilot testing was installed onboard Liberty of the Seas while the ship was in service. The compact design required no extra space as the scrubber replaced the ship’s exhaust silencer.

Initial testing has been undertaken with the system in full-scale operation and the engine running from 2 to 12.4 MW. The scrubber has produced successful results in both open loop and closed loop using seawater.

Prior to the shipboard pilot, a preliminary scrubber test was performed shore side in Norway for 11 months. After several visits to analyze the scrubber’s performance, Royal Caribbean committed to a pilot test.

“The small size and low weight of the scrubber got our attention,” said Anders Aasen, Associate Vice President, Global Marine Technical Services at Royal Caribbean Cruises Ltd. “When we saw the initial performance results, we were convinced to launch a full scale trial.”

Over the next 4-6 months Green Tech will continue to test the GTM R15 onboard Liberty of the Seas to demonstrate that the scrubber can be operated continuously over a sustained period of time and maintain the same positive results as the initial tests achieved.

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