What is DFDE LNG?
Abbreviation for Dual Fuel Diesel Electric, a type of propulsion system used for LNG carriers. DFDE consumes heavy oil and natural gas in a diesel cycle to generate electricity. This electricity is used to drive the propeller for propulsion of the vessel, as well as to operate equipment for regasification.
What is a Megi ship?
Teekay’s very first M-type, Electronically Controlled, Gas Injection (MEGI)-Type LNG carrier – was successfully delivered to Cheniere Marketing. MEGI vessels are designed to be significantly more fuel-efficient and have lower emission levels than other engines currently being used in LNG shipping.
What is TFDE?
TFDE stands for Tri-Fuel diesel electric propulsion ships specifically for LNG carriers.
What is traditional propulsion system used onboard LNG carrier?
LNG ship propulsion systems. Traditionally LNG carriers use a boiler and steam turbine propulsion system that can consume the boil-off gas during transport. Dual fuel diesel electric (DFDE) propulsion system: Offers high fuel efficiency and freedom of fuel choice between fuel oil and BOG from the LNG cargo tanks.
How does LNG ship engine work?
Most propulsion systems in LNG carriers use the BOG and liquid fuels. In a steam plant, the BOG is used to fire the boilers and produce steam. The steam drives the turbines and propels the ship. If there isn’t enough BOG, liquid fuel (heavy fuel oil or HFO) is used to keep the plant operating.
What is methane slip?
Methane slip is the unburned methane from engines which is caused by two main reasons: Due to dead volume in form of crevices between cylinder unit components. Incomplete combustion in form of quenching at the coldest part of the combustion chamber when running lean.
What is tri fuel engine?
The Tri-fuel engine technology is already present in the marine market and is mainly used for LNG ships with marine diesel oil, heavy fuel oil, and liquefied natural gas (LNG) used together as marine fuels. The first implementation of such engine is under process on a 7300 TEU container ship undertaken by Wartsila.
What is LNG fueled vessels?
A marine LNG engine is a dual fuel engine that uses natural gas and bunker fuel to convert chemical energy in to mechanical energy. The natural gas is stored in liquid state (LNG) and the boil-off gas is routed to and burned in dual fuel engines.
Can LNG be used in diesel engines?
Diesel-LNG engines are becoming popular for ships and heavy-duty truck propulsion [3–22]. A key advantage of LNG over Compressed NG (CNG) as a transport fuel is its energy density [23]. LNG is the preferred solution for HDT used in regional distribution as well as long haul transport [24,25].
How does LNG propulsion work?
What is the capacity of an LNG tanker?
266,000 cubic metres
Each ship has a cargo capacity of between 210,000 and 266,000 cubic metres (7,400,000 and 9,400,000 cu ft) and is equipped with a re-liquefaction plant.
Is the DFDE lngcs a new technology?
The only “new” technology for the crews to be introduced onboard the DFDE LNGCs is the frequency converters that control the speed of the electric motors. These frequency converters are actually not new technology as they have been used in many demanding onshore applications for many years.
How much fuel does a Megi LNG vessel use?
MEGI vessels are estimated to consume up to 100t of fuel a day, while efficient, dual-fuel, diesel-electric (DFDE) propulsion systems use 125t to 130t. DSME is expected to install the cargo containment system capable of transporting 174,000m³ of LNG over the next eight months.
Is there a dual fuel diesel electric LNG carrier?
The introduction of the dual fuel diesel electric (DFDE) LNG carrier (LNGC) and the slow speed diesel driven LNGC with onboard reliquefaction (DRL) are radical departures from the currently dominant steam turbine drive technology.
What kind of propulsion system does a LNG carrier use?
Electric propulsion systems for LNGC’s include the following components: •Prime movers, i.e. dual fuel diesel engines; • Prime mover driven generators; • Main switchboard to distribute the generated power to the various consumers; • Propulsion transformers; • Frequency converters;