As 2015 approaches, the anticipated rush to install scrubbers has started and announcements of major scrubber contracts are commonplace. Emsys, the laser based emissions monitoring system from US technology firm WR Systems, Ltd. (WR), have now been selected as the compliance monitor system on 5 differing scrubber types.
There are various scrubber designs currently being installed for owners keen to become both compliant and efficient. Depending on the vessel type and intended application, these include seawater, freshwater, hybrid, dry, open loop and closed loop amongst other novel designs.
WR designed their Emsys system using laser sensor technology; this means that the exhaust gas is measured in the same form as in the stack and not conditioned, cooled or dried. The laser allows the system to accurately measure the emissions at low gas temperatures with high humidity present in the exhaust stream. Significant benefits of the technology are based around the elimination of consumable spare parts and regular maintenance.
Although scrubbers only require monitoring of the SO2/CO2 ratio for compliance, the Emsys system has found favour with shipowners due to its capacity to measure multiple gases including NOx, SOx, CO2, CO, CH4 and PM. Applications using a combination of an SCR and scrubber, combined with possible operation of engines using LNG, require a wide range of data necessary to optimise performance and provide compliance. Simple scrubber monitors are not suited to provide this level of reporting.
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WRSystems, August 9, 2013