Stuttgart opts for natural gas trucks
SEVEN Mercedes-Benz Econic NGT (Natural Gas Technology) models with an environmentally friendly natural-gas drive system and extensive safety features are set to take over waste collection and disposal duties in the city of Stuttgart, the regional capital of Baden-Württemberg.
In Johannesbug, 50 buses with the same fuel sources are already operating.
Peter Bauer, head of product management Econic, Mercedes-Benz Special Trucks unit, handed over the seven Econic models to Dr Thomas Hess, CEO of the local authority owned enterprise AWS Abfallwirtschaft Stuttgart, and Dirk Thürnau, technical mayor of Stuttgart, on February 23.
“The purchase of the latest generation of the Mercedes-Benz Econic NGT is of particular importance for Mercedes-Benz Trucks. The regional ties to Stuttgart play just as big a role as AWS’s long and intensive relationship with Mercedes-Benz products,” said Dr Ralf Forcher, head of marketing, sales and services MercedesBenz Special Trucks.
Since the market launch of the Econic in 1998, the regional capital has pursued an ongoing policy of purchasing Econic vehicles to replace its conventional waste disposal vehicles and AWS Stuttgart has been involved with the Econic and Econic NGT from the outset as a development partner.
Econic product manager Peter Bauer said that this forward-thinking investment will make an important contribution towards ensuring a positive environmental track record. The key reason behind this lies in the innovative drive technology with economical fuel consumption combined with very low CO² and noise emissions.
“AWS is taking on the issue of fine dust emissions in Stuttgart,” said Hess.
With their 3 900 mm wheelbase, AWS Stuttgart’s new, full air-suspension Econic NGT waste collection vehicles are extremely agile.
This is an important advantage when it comes to urban traffic in Stuttgart’s city centre. They have a permissible GVW of 26 t, which is identical to the diesel variant of the Econic.
The Econic vehicles with natural-gas engines boast very low nitrogen oxide, particulate and noise emissions. The pass-by noise emissions of the Econic measured in Stuttgart at 78 dBA are audibly lower than those of a Euro VI diesel engine, which have been measured at 80 dBA. The tank holds up to 600 litres of natural gas, allowing high ranges for daily waste collection operations.
For the first time, the seven new Econic NGT models in Stuttgart feature the new Euro VI M 936 G natural-gas engine with a displacement of 7,7 l and a powerful output of 222 kW (302 hp). The configuration of the fuel-efficient BlueTec in-line six-cylinder engine is, in many respects, identical to that of a conventional diesel engine. However, the natural-gas engine in the Econic NGT burns a prepared mixture of natural gas and air rather than a diesel/air mix.
Because combustion of the alternative fuel natural gas by the monovalent Econic natural gas engine produces virtually no particulate or fine-dust emissions, compliance with Euro VI limit values can be achieved without the need for SCR technology with AdBlue, post-injection processes and particulate filters for exhaust gas cleaning.
The CO² emissions measured are around 23% lower than those of a Euro VI diesel engine, and where biogas is used, it is possible to reduce CO² levels even further.
“Despite the higher cost of purchasing a natural-gas powered waste collection vehicle, the saving on fuel bills that can be achieved with a complete switch from diesel to natural gas is going to offset our additional costs after around three and a half years,” said Hess.
Fitting an Eco package limits the vehicle speed to 85 km/h.
Seven Mercedes-Benz Econic NGT models with an environmentally friendly natural-gas drive system are set to take over waste collection and disposal duties in the city of Stuttgart, Germany.