The most climate neutral solution for 700 metre deep mine shaft with NOVENCO® ZerAx® fan

The most climate neutral solution for 700 metre deep mine shaft with NOVENCO® ZerAx® fan


The Teutschenthal backfill mine in Thüringen, Germany is one of the most modern mines of its kind in Europe. Over the past few decades the mine operated to extract salt before it was closed in 1982. It has now been converted into a modern backfill mine and serves to protect the surface through filling up the cavities in the former excavation. For this purpose, more than 200,000 tons of mineral waste materials are stored every year at a depth of approx. 700 metres. By using the cavities for the environmentally friendly and long-term safe disposal of mineral waste from municipal and industrial plants, the backfill mine makes a significant and sustainable contribution to environmental protection.


For the latest renovation project at the backfill mine, carried out to improve ventilation systems under the ground, the main contractor Jeremias® Chimney Systems has delivered a specially designed and 36 m tall chimney together with all steel construction and ductworks. With focus on a sustainable green solution for the project, the NOVENCO® ZerAx® axial flow fan was approved as an obvious choice for the Teutschenthal mine owners. The highly efficient and in 98% recyclable fan contributed considerably to the achievement of a state subsidy for the project. The ZerAx fan, in size Ø2 m, is combined with an IE5 class Nidec PM motor type Dyneo+ and a Danfoss VLT frequency converter, which gives the unique configuration of the latest EC+ fan technology. This highest possible system efficiency is a green solution that goes beyond the requirements of today.


Here in the Teutschenthal backfill mine, the ZerAx fan with efficiency up to 92% is combined with an IE5 class Nidec PM motor and a Danfoss VLT frequency converter. The motor power is 220 kW. In a direct comparison to traditional IE3 motors of 220 kW, the weight-saving is approx. half a ton. Also worth mentioning is that traditional 4-pole AC motors of the same physical dimensions only have a maximum power of 132 kW. The implementation of this solution proves that synchronous EC+ technology can accommodate energy performance with a reduced environmental footprint in the form of less kWh. Less kWh consumed, fewer raw materials used and lower CO2 emissions. Combined with the ZerAx fan efficiency of up to 92%, 98% recyclability rate and 20+ years of lifetime this solution is of great benefit to the environment for many years to come.

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