Liebherr has enhanced the diesel engines for its mobile harbour crane (LHM) fleet in order to meet the required emission and fuel consumption targets for Stage IV/Tier 4 Final.
The smaller crane models LHM 120, LHM 180 and LHM 280 will be equipped with a 400kW engine, while the bigger crane models LHM 420, LHM 550, LHM 600 and the new giant LHM 800 are available with a 725kW diesel engine. Both engine versions can be boosted with the Pactronic hybrid drive system for up to 100% extra power.
For these latest standards, Liebherr has intensively optimized the whole combustion process. Compared with other solutions, Liebherr says it has developed a simple but effective solution that reduces the nitrogen oxides (NOx) emissions while cutting operating costs.
An essential part of the new engine generation is the gas emission treatment. To simplify the system and to optimize exhaust gas after-treatment, the German manufacturer engineered the Selective Catalytic Reduction technology (SCR), which reduces particles to a minimum already inside the engine. This leads to economic advantages for the customer: as the particle emissions are already lower than the emission limits, no more reduction measurements are necessary.
In this sense, the motor’s characteristics in terms of power, efficiency and economy are further optimized. The newly designed SCR catalyst and all other system components such as injector, air- and AdBlue-pump contribute to a significant NOx reduction of approximately 98%.
For Stage IV/Tier 4 Final, Liebherr offers a standardized basic engine that can be adapted to the emission requirements in different markets and regions by minor modifications or by fitting exhaust gas after-treatment systems. Specifically, that means that the engines in the emission standards Tier 2, Tier 3 and Tier 4 have the same performance, the same parameters for the cooling system, and the same interfaces for installation. That enables customers to substantially simplify their machine design by allowing engines with different emission standards to be exchanged in the same machine an important advantage for any equipment that is used all around the world.
Around the globe, an increasing number of ports are focussing on environmental issues, not least because of environmental restrictions as ports are steadily improving their eco-credentials.
The new Liebherr stage IV / Tier 4 Final diesel engines combine a number of advantages. Customers will benefit from less fuel consumption, less energy for engine cooling and less exhaust backpressure, which preserves the engine components.
Beside these potential savings maintenance is also very simple and cost-efficient; no periodical cleaning of the diesel particle filter is needed and the motor oil is much less contaminated by soot leading to longer service-intervals.
May 15, 2015
