High Cost or High Sulfur? Dilemma Fuels Discussion

The Ship Operations Cooperative Program (SOCP) has released its recently completed study on Exhaust Gas Cleaning System (EGCS). [More]

Navy removes waste heat boilers, steam systems and piping from cruisers

By Edward Lundquist at January 25, 2011 20:43
Filed Under: Navy insights
Navy removes waste heat boilers, steam systems and piping from cruisers By Edward Lundquist USS Hue City (CG 66) is undergoing the All-Electric Ship Modification at BAE Systems Jacksonville to improve the reliability and afford more efficient operation of the systems presently operated with steam. Hue City is undergoing the hull, mechanical and electrical (HM&E) portion of the Cruiser Modernization program, which includes removal of the waste heat boilers, and replacement of the steam-driven evaporators with new reverse osmosis (RO) systems to make fresh water. This is a big deal.  The boilers and much of the steam supply and exhaust condensate return lines—about 70 tons going all the way up to the Captain’s cabin —are being pulled out.  What was a good idea on paper was a bad concept in practice.  Yes, it was very efficient to remove heat from the gas turbine electric generator exhaust to make steam for hotel services and distillation ... [More]

Exhaust Gas Scrubbers

By Keith Henderson at August 16, 2010 08:29
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The expansion of Emission Control Areas (ECA) in North American and European waters leaves ship owners using HFO with little choice other than to use a more expensive low sulfur HFO, change to MDO completely or use a dual fuel arrangement. The latter not only necessitates installing additional tanks and fuel handling equipment but also requires careful change over procedures to be followed every single time to avoid potential engine problems that can be very severe. An area that a few operators are pioneering is the use of exhaust seawater scrubbers. Hamworthy Krystallon produce a Seawater Scrubber that is designed to operate on a 3.5 per cent S HFO 380 fuel while complying with the EU in-port and MARPOL Annex VI requirement of a 0.1 per cent sulfur fuel. Hamworthy Krystallon early orders from Italian owner have been followed this month by an order to equip four 45,000 dwt ro-ro new builds at Daewoo. Sembawang Shipyard (SSPL), Singapore are interested in a potential retrofit project for seawater scrubbers. Switching to low sulfur fuels will create supply problems according to he International Petroleum Industry Environmental Conservation Association


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Reducing particulates on older engines.

By Keith Henderson at June 16, 2010 11:20
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As emission requirements become stricter as the years pass, the question arises, what to do with older engines. The EPA Marine Engine Re manufacture Program introduces a law effective March 2008 to force operators of older ship engines to upgrade them to reduce emissions. The rules are rather limited, specifying that the improvement must reduce particulates (PM) by at least 25 per cent, that the engines concerned are commercial (not recreational) applications, manufactured after 1973, over 600kW, cylinder displacement under 30 liters and be a US flagged vessel. The upgrade only becomes compulsory if there is an EPA approved upgrade available and must be carried out at the next scheduled ‘re manufacturing event’ e.g. replacing cylinder liners. Changing many parts to effectively convert an old engine into a new model is usually not economic, nevertheless changing some parts can make a significant reduction in emissions. Although other ways to achieve the same end of reduced emissions are changing fuels, fuel additives or adopting an after treatment system.
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MAN Two Stage Turbo charging

By Keith Henderson at June 13, 2010 16:29
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Lower exhaust emissions of large bore diesel engines without after treatment, can be realized by increasing the mean effective pressure. One way to achieve a higher m.e.p. is to increase the boost pressure of the turbocharger however standard turbo designs are already at or approaching the limit of their capability to go from atmospheric pressure to the desired boost pressure in one unit: the solution is therefore to use two turbo stages. Simply, it comprises a low pressure turbine feeding via an inter cooler a second high pressure turbine which in turn passes through a second inter cooler to the engine. Control of a two stage turbo system including the suppression of compressor surging.is complex and is effected with the aid of variable nozzle rings (VTA) and bypasses. MAN Diesel & Turbo have recently announced their own series of two-stage turbos called the New TCX Generation. Using a configuration with the turbos at 90 degrees to each to provides a compact solution and reduce the amount of piping.
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