Alfa Laval’s PureSOX Secures Repeat Order

Posted by Michelle Howard
Thursday, January 16, 2014

As the marine industry struggles to prepare for 2015 and the first wave of sulphur emission limits, Alfa Laval technology is proving its worth. Following a similar order from DFDS earlier in 2013, a repeat order for PureSOX was placed by Dutch ship owner Spliethoff near the end of the year. The order confirms not only the commercial viability of the exhaust gas cleaning system, but also customer confidence in the system’s performance within Emission Control Areas (ECAs).



Signed in November, the order from Spliethoff comprises PureSOX systems for five Con-Ro vessels. The vessels will be retrofitted between June and December of 2014.



PureSOX is a hybrid scrubber system, able to operate with either seawater or fresh water. And while the technology is relatively new, it has been demonstrated to reduce sulphur content in vessel exhaust by more than 98%.  “This is the true significance of the order,” says René Diks, Manager Marketing & Sales, Exhaust Gas Cleaning at Alfa Laval. “The five new systems are a vote of confidence from Spliethoff, given after observing PureSOX during thousands of hours of actual use.”
 


An order based on real-world experience

Spliethoff, one of the largest ship owners in the Netherlands, has been operating with PureSOX aboard the M/V Plyca. Alfa Laval delivered the system in 2012, and it has been in continuous use aboard the vessel ever since it was installed. Sailing within the North European ECA, the M/V Plyca has logged more than 6,000 hours in full compliance with the new IMO regulations.
 


“As a frontrunner with the M/V Plyca, we’ve gained a lot of practical experience with scrubber technology,” said Frank Louwers, Director of Spliethoff. “The PureSOX system works well, and we’re convinced that scrubbers are the right way to proceed in complying with upcoming legislation.”



Cleaning exhaust from multiple engines

The PureSOX system installed aboard the M/V Plyca is a multiple-inlet system, able to clean the exhaust gas from both the main and auxiliary engines. The same will be true for the deliveries in the new order. Each will serve four Wärtsilä engines with a combined power of 28 MW, handling an exhaust gas mass flow of 132,000 kg/h.



Spliethoff’s experience with the multiple-inlet installation aboard the M/V Plyca is that it is both efficient and reliable. As Diks explains, this can be expected no matter how many of the inlets are used at a given time. “With PureSOX, we’ve established very effective means of closing off the pathways from engines that aren’t in use,” he said.



Centrifugal separation – a key to success

Another area where PureSOX has proven effective is the cleaning of the scrubber wash water.


PureSOX saves on caustic soda and fresh water by operating in an open loop with seawater. But in low-alkalinity waters or in harbors and other areas where discharge is strictly regulated, a closed loop with fresh water is an alternative.
 


The fresh water in a closed loop must be cleaned, which has proven an Achilles heel for many exhaust gas cleaning systems. The roll and pitch of rough seas, for example, can make it difficult for filtering, settling or flocculation processes to manage their job. In PureSOX, however, Alfa Laval’s expertise in high-speed centrifugal separation has provided an answer.
 


“Alfa Laval’s PureSOX H20 water cleaning unit reliably cleans wash water to within IMO discharge limits, which makes it a key component of the PureSOX technology,” said Diks. “Despite having a century of experience in centrifugal separation, it took us three years to perfect the separator at its heart. So any supplier without that experience faces an uphill battle to perfect closed-loop operation by 2015.”



Looking ahead with confidence
Spliethoff is convinced by the results already seen with PureSOX, both in closed-loop and open-loop operation. And in managing the new requirements of 2015 effectively, the ship owner sees great benefit in the operating flexibility of a hybrid scrubber.



For Alfa Laval, confidence and flexibility in meeting emission limits are a major focus as the Alfa Laval Test & Training Center now opens its doors. “At our new center in Aalborg, Denmark, exhaust gas cleaning solutions take pride of place,” said Diks. “As customers see what we can achieve, either in onboard installations or at the test center, I think more of them will share the belief and experience of Spliethoff and DFDS, namely that IMO limits can be met – reliably, cost-effectively and in time for 2015.”

 


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