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Alfa Laval to diversify its PureNOx technology to accommodate different sulfur levels

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Hydrocarbon Engineering,

Alfa Laval will diversify its PureNOx water treatment technology into two systems so as to operate with different fuel sulfur levels.

Alfa Laval PureNOx technology is used for water treatment in exhaust gas recirculation (EGR), one of the main strategies for Tier III NOx compliance.

The technology will be channelled into two systems, PureNOx LS and PureNOx HS, optimised according to fuel sulfur level and the updated specifications of engine manufacturer MAN Energy Solutions.

Ayla Körlof, Global Business Manager, Alfa Laval PureNOx, said: "The centrifugal separator module, which will be identical for PureNOx LS and PureNOx HS, will be 50% smaller than that of today’s PureNOx Prime.”

PureNOx LS, which will be used with EGR engines running on low-sulfur fuel, will clean the EGR bleed-off water before overboard discharge in accordance with the upcoming Marine Environment Protection Committee (MEPC) resolution on EGR guidelines. MAN Energy Solutions has determined that EGR process water cleaning is not necessary when low-sulfur fuel is used. This allows for a setup that is much like a bilge water system, where the centrifugal separator is combined with an oil monitor and a three-way valve.

EGR process water will be cleaned by PureNOx HS, which will be used with EGR engines running on high-sulfur fuel in combination with a SOx scrubber. In PureNOx HS, the separator will be combined with an initial filter stage to remove the worst process water contaminants. Heavier particles will be separated from the bleed-off water prior to discharge through the SOx scrubber system, in line with the pending EGR guidelines.

“When PureNOx HS is used with a closed-loop or hybrid scrubber system, the EGR bleed-off water will be processed by the SOx system’s own water cleaning unit,” says Körlof.

Both systems will support operation in Eco EGR mode. Eco EGR is an additional engine mode in which EGR is used for Tier II as well as Tier III compliance. When Eco EGR is employed for Tier II, the EGR system will reduce NOx formation.

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