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Monday, December 20, 2021 

As an investigation into options for compliance with upcoming CO2 emission regulations, Finnish maritime clean tech company Langh Tech has started researching the possibility of carbon capture on board vessels, with the first tests successfully performed on board a sister company Langh Ship vessel, using its existing Langh Tech hybrid scrubber.

Langh Tech has conducted several preliminary tests of capturing CO2 emitted by a vessel’s main engine by the means of using an existing Langh Tech closed loop SOx scrubber system. In the tests, additional alkali was added to the scrubber closed loop process water in order to provoke a reaction between the alkali and CO2, effectively capturing the CO2 from the exhaust gas into the process water. The setup of tests was limited by the capacity of the existing alkali pump, but positive results were observed even with only a slight increase in the alkali dosing. At a main engine load of approximately 85%, a 5% increase in alkali dosing (over normal level) was able to reduce the measured CO2 emission by 3.3%. At 40% main engine load, a CO2 emission reduction of nearly 7% was observed.

During the tests, the alkali consumption remained at a reasonable level, and this is considered to offer a viable effect on the operating expenses of the vessel. Results of these tests are regarded as a tentative proof of concept and additional tests with further increased alkali feed will be conducted to verify this. The CO2 capture feature could be applied to any Langh Tech closed loop or hybrid scrubber systems with relatively low cost impact, involving only minor changes to the existing scrubber system. The process could be performed with readily available alkali products such as NaOH and MgOH2, which are both already being used in many SOx scrubber processes.

Langh Tech says it is researching methods of extracting the captured CO2 from the process water and looking for ways to store and/or utilise the captured CO2 efficiently both onboard vessels and for discharge to shore.

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