Scania, düşük maliyetinin yanı sıra, minimuma indirgenmiş olumsuz çevresel etkileri ile de avantajlar yaratan sıvılaştırılmış doğalgazlı (LNG) Euro 6 motorlara sahip çekicilerin satışına Hollanda’da başlıyor.

Scania Doğalgazlı kamyon

2014 yılından bu yana LNG’li Euro 6 motorlu araçlarla test sürüşleri gerçekleştiren Scania; bir tank sıkıştırılmış doğalgaz (CNG) ile yaklaşık 250-300 kilometre yol kat ederken, bir tank LNG ile yaklaşık 1.000 kilometre mesafeye ulaştı. Mevcut akaryakıt istasyonlarının altyapısının da rahatlıkla kullanılabilmesi nedeniyle dağıtım problemi bulunmayan LNG, şehir içi dağıtım ve çöp toplama kamyonları için diğer yakıt türlerine göre rekabetçi bir alternatif haline geliyor. LNG’yi özellikle Avrupa ülkelerinde, litre fiyatının dizel akaryakıta göre yaklaşık yüzde 50 daha ucuz olması da cazip hale getiriyor.

Daha çevreci

LNG’nin önemli avantajlarından bir tanesi de çevreci yakıt olması. Dizel yakıtlı motora göre daha sessiz olan LNG’li motor, karbondioksit salınımını da yaklaşık yüzde 10 azaltıyor. Parçacık emisyonları neredeyse tamamen ortadan kalkarken, azot oksit emisyonları da üçte bir oranında azalıyor.

Scania is now starting to sell the liquefied natural gas vehicles in the Netherlands

In 2014, Scania launched the first Euro 6 trucks powered by liquefied natural gas. Interest has been strong around the world, and Scania is now starting to sell the vehicles in the Netherlands.

Interest in liquefied natural gas (LNG) is growing fast. As well providing the environmental benefits of gas power, LNG brings cost benefits. It is considerably cheaper to create the infrastructure needed for LNG than it is for compressed natural gas (CNG).

Another advantage is that transport companies can drive up to 1,000 kilometres on a tank of LNG, compared with just 250 to 300 kilometres on a tank of CNG. This bigger operating radius makes the fuel a competitive alternative for use in regional distribution, while CNG is currently mostly used for limited city distribution and garbage collection.

Anatomy of an LNG tank

LNG is kept at minus 132 degrees Celsius and under 10 bar of pressure. Such a low temperature cannot be achieved using the vehicle’s active cooling system alone, and the LNG is stored in something akin to a thermos, surrounded by a vacuum inside an insulating layer.

  1. Heat exchanger. The heat exchanger vaporises the LNG into a gas. It does not change the fuel pressure. The heat for this process is obtained from the engine cooling system, which is connected to the side of the LNG tank.
  2. The economiser pressure regulator reduces the tank pressure by venting gas to the fuel line when the engine is running. It then determines whether fuel should be used from the top of the tank (in a gaseous state) or from the bottom of the tank (in a liquid state), depending on the pressure in the tank. The Scania LNG tank has an economiser function set at 10 bar. This means that when the pressure reaches 10 bar fuel is taken from the top of the tank to reduce the pressure.
  3. Filling nozzle fittings. These are where the nozzles are fitted during a visit to a filling station. The lower, larger connection is where the LNG nozzle is connected. The upper connection is a vent connector to vent back gas to the filling station in case of excess pressure in the tank during filling.
  4. Fuel level sensor. The fuel level is measured by a capacitive sensor located inside the tank, which can distinguish between fuel in its liquid and gaseous states. As a result, it is able to supply accurate information on the fuel volume to the fuel level gauge in the cab.
  5. Safety valves. The primary safety valve is set at 16 bar and vents out of a pipe behind the cab. The secondary safety valve is set at 24 bar and has a red seal to show when gas has been vented and something is therefore amiss with the LNG fuel system.
  6. Check valve. This protects the tank from fuel spillage in the event of an accident or a fill coupler failure.
  7. Manual shut-off valves. These allow for the isolation of the tank for servicing. The red handle is the fuel cock, which leads to the fuel line. The grey handle is the ventilating valve and is usually closed during normal operation.
  8. Solenoid valve. This is closed when the system is not being powered. It opens when the engine is running and provides fuel to the engine. The solenoid valve is located downstream from the heat exchanger.
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