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The pressure to increase efficiency, reduce costs and limit environmental impact is bringing vessel speeds down. It’s now widely agreed that slow steaming can reduce the amount of fuel required for a voyage and at the same time reduce carbon emissions significantly. A speed reduction of 20% can lead to more than 30% cost saving on the fuel used and bring a similar reduction in the amount of CO² produced. Yet against these positives, there are disadvantages.
Dilution Rate: 1:3,000 (333ppm)
Problems Caused By Slow Steaming
The primary disadvantage with slow steaming is poor combustion in the engine at low loads. This can reduce efficiency through a build-up of soot deposits in the engine and exhaust gas economiser.
Slow Steaming with Poor Ignition & Combustion Fuels
Reduced efficiency of turbocharger and increased deposit formation (Low exhaust flow means inability to maintain sufficient boost pressure). Poor combustion leads to deposits on pistons, cylinder heads, valves, injectors, scavenge spaces etc. Exhaust gas economiser - low exhaust flow and poor combustion leads to increased depositing. Can also result in uptake fire. Risk of cold corrosion in combustion chamber and exhaust gas system lower exhaust gas temperatures at low load.
The Hydra HFO Slow Steaming Fuel Additive actively overcomes many of the above problems it reduces the formation of soot and soot deposits. It works across three fronts: improved fuel atomisation and active combustion catalysts together with deposit modifying properties ensure the best fuel performance in the engine.
Organic Combustion Improvers
Mean improved spray pattern exposing more fuel to charge air (improve atomization). Releases free radicals for more vapour production (influence earlier ignition). Reduces droplet size (less mass) allowing faster heat up and earlier ignition. Smaller coke particles require less time for complete burn through.
Combustion additive advantages to converted residual fuels burned under slow steaming operation. Fuel ignition optimized fuel spray pattern (reduce droplet mass – increase fuel surface). Faster carbon oxidation with Fe combustion catalysts (reduce fuel ignition temp) critical for engines under slow steaming. Fuel combustion provides more time for complete combustion. Complete burn out of fuel utilizes all carbon into energy – not deposits = Specific fuel consumption reduction. Deposit reduction reserves engine efficiency between scheduled maintenances and reduce SFC by keeping deposit free: piston crowns, rings, injector nozzles and valves, Economiser, Turbocharger nozzle ring and blades.
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Cerberian House, Carters Lane, Kiln Farm
Milton Keynes, MK11 3ER, UK
UK Head Office: +44 1908-265889
Asian Sales Office: +91 120 4380032
Email: support [at] hydra-int.com
Company registration number: 02982464. Company registered in England