NOx and SOx control
to the company’s two new builds, Norwegian Escape and Norwegian Bliss under construction at Meyer Werft in Germany. Clean Marine, based in Lysaker, is to supply scrubbers for two 38,000 dwt chemical tankers being built for Stolt Tankers and NYK Stolt Tankers by Hudong-Zhonghua Shipbuilding in China. The two vessels are part of a series of six sister ships and the remaining four vessels will be designed with the flexibility to add a
scrubber at a later stage. Clean Marine’s system is based on Advanced
Vortex Chamber technology and its integrated fan and gas recirculation technology allows the single exhaust gas cleaning system to simultaneously serve several combustion units. In total, it will manage seven exhaust
designed to clean 140 tonnes of exhaust per hour. • In August 2013, Clean Marine’s scrubber became the first to be allowed to operate in the
Meeting Tier III: Can it be that hard?
Russia’s argument at MEPC that technology to meet Tier III is not available, is not one that many engine makers would agree with. Leaving aside engines that run on LNG or other gaseous fuels all the time, over the past three years new engines in both the medium and low speed sectors meeting Tier III levels have become available from every major
An MAN Diesel & Turbo SCR, installed downstream of an MAN 6L48/60B main engine (credit: MAN Diesel & Turbo)
engine maker. For current engines models that do not yet measure up, selective catalytic reduction (SCR) is an option that would ensure compliance if it is needed. Not every vessel will be obliged to meet Tier III because it only applies to ships built after 1 January 2016 when operating in an ECA. If a ship will be operating outside of ECAs then only Tier II emission limits need be complied with. Of course, the big problem is that shipowners contemplating a new order now or in the very near future cannot know with any certainty what new ECAs might be established over time. So to ensure the continued guaranteed ability to trade everywhere in the world, every vessel built after 1 January 2016 will need a Tier III-compliant engine to be fitted or provision made for it to be brought up to standard in the future. Proving compliance will of course result in more costs as some form of monitoring will be necessary to satisfy port state control authorities that the engine is running in the appropriate mode. So far, the engines that meet Tier III have been able to do so using SCR or exhaust gas recirculation (EGR). The latter is a developing technology that is improving but probably has
Japan joins scrubber club
A new joint venture between Mitsubishi Heavy Industries (MHI) and Mitsubishi Kakoki Kaisha (MKK) to develop a hybrid system means that Japan has now joined the very short list of countries where scrubbers are likely to be manufactured. The announcement by the two partners in February this year said the system is the first in Japan able to comply with the 2015 ECA emission standards, which suggests that others within the country are also working on scrubber development. In common with most systems now
in production, the Japanese version has two scrubbing systems: one that uses circulating freshwater and the other using one-pass flow with seawater. The
82 I Marine Propulsion I April/May 2014
freshwater system can scrub exhaust gas from combustions of heavy fuel oil with 3.5 per cent sulphur content to the equivalent of low-sulphur fuel oil with 0.1 per cent sulphur content, achieving compliance with SOx emission regulations of IMO scheduled to go into effect in ECAs in 2015.
The seawater system can scrub exhaust to match that of 0.5 per cent sulphur content fuel oil to comply with regulations that are expected to be applied in global marine areas in the future. Washing seawater is discharged outside after treatment, complying with requirements for discharged wash water. The system includes a SOx scrubber,
a container unit housing a wash water processing system and other components and ISO standard tank containers to store sludge and a caustic soda solution (NaOH) to neutralise circulating fresh water. Modular construction is said to enable flexible arrangement of components, reducing installation time and cost requirements, and making it easier to retrofit the system to ships already in service.
the
MHI and MKK plan to install one of new high-performance
systems
on a car carrier in a joint study with ClassNK, K-Line and Japan Marine United Corporation as part of ClassNK’s Joint R&D for Industry programme.
www.mpropulsion.com some way to go before issues such as increased
CO2 output and reductions in efficiency are resolved. Unlike the EGR systems that are in-house modifications by engine makers, SCR is usually a third party supply, although system makers may co-operate with engine producers. SCR is more effective – up to 99 per cent in some cases and under certain conditions – and is proven technology with more than 500 systems installed and in operation. It does however involve capital outlay, unavoidable running costs and comes with a space and weight penalty.
Compact SCR systems are beginning to debut with MAN Diesel & Turbo and ABB among those producing smaller systems. In these, the catalyst is some 80 per cent smaller than early systems but is still a large piece of equipment that must be placed between the turbochargers and any boiler or waste heat recovery system. The catalyst will need replacing at intervals of around four to five years but, because the catalysts are arranged in a layered system that allows for only damaged catalysts to be identified and exchanged, it is not necessary to replace the entire catalyst at the same time. MP
sources and will be
US emission control area. The Torvald Klaveness self-discharging bulk carrier Balder arrived at Baltimore where its master sought approval from the coast guard to enter and exit the ECA Zone using high sulphur fuel oil using an EGCS. Officials from the USCG conducted a Port State Control examination and confirmed that the Clean Marine EGCS was in full compliance with Marpol Annex VI as an equivalent to using low-sulphur fuel.
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