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SAFETY4SEA

Carbon capture tests successful on cargo ship with scrubbers

by The Editorial Team
December 17, 2021
in Emissions
green corridors
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Langh Tech has started researching the possibility of carbon capture on board vessels. The first tests have been successfully performed on board one of the vessels, using a scrubber installed on board.

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.

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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 effect of this to the operating expenses of the vessel would remain feasible.

Results of the tests are regarded as a tentative proof of concept and additional tests with further increased alkali feed shall be conducted to verify this.

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 is also researching methods of extracting the captured CO2 from the process water and looking for ways to store and/or utilize the captured CO2 efficiently both onboard vessels and upon possible discharge to shore.

Tags: carbon storagedecarbonizationreducing shipping emissionsscrubbers

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