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Whether it’s of a small ship plying in the coastal areas or of a massive one voyaging international waters, a marine engine of either 4-stroke or 2-stroke is fitted onboard ship for the propulsion purpose. Waste heat from the cruise ship’s engines is extracted by a series of heat exchangers located on the exhaust path after the turbochargers en-route to the scrubber. Typically, exhaust gas is approx 350°C, but it’s cooled continuously by heat extraction to approx 30°C when it emerges from the funnel. Decarbonization and digitalization are changing the way we power cruise ships. Our experts can help you find solutions which respond to questions of fuels, emissions, technology, and retrofits.
What are Cabins Near the Engine Room Like?
Even some older cruise ships are being retrofitted to allow for shore-to-ship power. But most of the energy produced by the ship’s engines goes towards powering the propellers, and running the engines while docked created massive energy waste. Despite innovations in engine technology, cruise ships produce a lot of pollution. The engines work the same as a traditional diesel engine, but rather than connecting to the propeller shaft – diesel-electric engines connect directly to large generators.
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Engine failure can occur, though, in the ship’s main engines, which are responsible for moving the ship. Improper maintenance, mechanical issues, and human error can all be factors in causing engine failure. While cruise ships can move upwards of 34.5 miles per hour (30 knots), most will only travel at 23 miles per hour (20 knots).
LNG-powered cruise ships
The Promas Lite propulsion future clients, besides passenger ships, are marine vessels like fishing and freighter ships. Azipod marine ship propulsion is a combination of both steering and propulsion systems. Conventional marine propulsion systems use a two-stroke engine connected to a shaft, that passes through a stern tube and shaft tunnel to connect to the propeller outside the hull in the ship's aft/stern.
Azipod cruise ship propulsion system
But how does she manage to maneuver if they can push in one direction only? One option is to make them bigger and more effective when maneuvering, another is to add additional mini-pods or install full-sized pods.
Fuel Efficiency
Older cruise ships may still use a diesel reciprocating engine to generate enough power to move them. Power is supplied to the ship through a transmission going to a propeller shaft. Without a cruise ship engine, these vessels would be nothing more than a floating hotel. They would drift aimlessly at sea and would lack any form of propulsion. Looking at the sheer size of these vessels makes one wonder how large an engine needs to be to maneuver the ship successfully in water. But due to the size constraints, they can’t produce the same power as the main engines and cannot propel the ship.
Can the world's biggest cruise ship really be sustainable? - Euronews
Can the world's biggest cruise ship really be sustainable?.
Posted: Tue, 30 Jan 2024 08:00:00 GMT [source]
Conventional Diesel
In the past, cruise ships kept their engines running while docked to generate electricity for shipwide services. Every cruise ship has an emergency generator to maintain vital electrical power in case of engine failure. Storage requirements on board for LNG require very large tanks, so this type of fuel is most commonly being used on smaller ships that don’t travel as far, like ferries. But as the technology improves, it should start to be seen on larger cruise ships. Of the three propulsion types presented here, diesel engines are the simplest technology.
Combined Gas and Steam Turbine Engines (COGAS):
The size of the different types of engines is an important factor in selecting what will be installed in a new ship. Slow speed two-stroke engines are much taller, but the footprint required is smaller than that needed for equivalently rated four-stroke medium speed diesel engines. Multiple engine installations also give redundancy in the event of mechanical failure of one or more engines, and the potential for greater efficiency over a wider range of operating conditions. Ship's powerplant includes 4x Wartsila engines (model 8L50DF, total power output 30,4 MW). Propulsion is diesel-electric (2x shafts with fixed-pitch propellers) and wind-assisted (with 1x rotor sail). LNG tanks are two (type C / vacuum insulated), each with capacity 200 m3 and weight 140 tons (LNG weight 85 tons per tank).
Icon of the Seas Engines Started for the First Time
The variable speed and torque requirements for the PEMs are handled by the convertors which convert fixed voltage and frequency to variable voltage and frequency for propulsion needs. Directional controls (ahead and astern movements) are obtained by changing the input phase sequence of the supply. This is by interchanging any two phases with the help of thyristors. In the event of an emergency, guests can be proactive by paying attention to the mandatory safety exercise. If anything, the vibrations caused by the engines are more likely to cause annoyance over the sound of the engine. All the machinery in the engine rooms is monitored in the Engine Control Room (ECR).
Wartsila is still the Guinness World Record holder for the largest ship engine ever built. The four events are completed in four strokes of the piston (two revolutions of the crankshaft). An inlet and exhaust valve is fitted on top of the cylinder head to draw in fresh air and to expel the used exhaust gas. Staying in one of these cabins means that you will likely be exposed to plenty of noise and vibrations from the engine. You’re also likely to experience noise from the crew as they go to and from work throughout the day and night. Small and cramped are the defining characteristics of a cabin near the engine room.
The power requirements of a cruise ship can vary greatly, depending on the ship’s size and capacity. Larger cruise ships may have multiple engines or engine systems to meet the power demands. The engine selection must be able to meet these power requirements efficiently and reliably. While gas turbine engines offer several advantages, they also have some considerations to take into account, such as higher fuel consumption at lower speeds and the need for regular maintenance. However, ongoing advancements in gas turbine technology continue to improve their efficiency, reliability, and environmental performance.
Generally, the only fuel tanks found in the engine room would be the settling and service tanks. In addition to propulsion, the power requirements for onboard facilities and amenities must also be taken into account. Cruise ships have a wide range of facilities, including restaurants, bars, entertainment venues, spas, and more. These facilities require electricity and other energy sources to operate smoothly.
“The first main engine start on a ship largely tells a lot about the ship’s readiness. It is a sign that the various departments throughout the yard have achieved something significant. To achieve this milestone, all professional groups are needed, and for that, big thanks to everyone!
In normal conditions, the emergency switchboard is supplied from the main bus bar. When there is a loss of main power, the supply breakers open and the emergency DG starts and takes over the supply to the ESB. On resumption of the main power, the EDG breaker is automatically disconnected. In case of failure of one half-drive, the other one operates the PEM, though at reduced power.
The displays on the bridge show both the angle of the rudder or thrusters, as well as the rate and the radius of the maneuver in progress. The electromagnetic logs create an electromagnetic field in the water around the ship, with the aid of a small alternating current and a transducer. A voltage proportional to the speed of the ship is generated in the water and is picked up by special sensors, which then transfer the information to an electronic device for interpretation.
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