EnPot TRIMET Results

The EnPot technology has successfully run on 12 pots at TRIMET'S Essen smelter in germany since June 2014; performing above expectations.

Roman Düssel, Production Manager – Electrolysis, TRIMET Aluminium SE, Essen, says the goal for TRIMET has been to find pathways to allow the smelter to shift power use by ± 25%.

The biggest problem with our conventional cell design is that we cannot maintain an operational cell heat balance when varying cell power, meaning the pots will either ‘tap out’ or ‘freeze over’ if the power input to them is shifted up and down by such a degree,” he says.

“The EnPot technology allows us to dynamically control the heat loss of the pot and therefore maintain heat balance under a wide range of operating conditions. It basically allows us to break the restraints of the current cell design and open up the operating window”, he says.

Roman says TRIMET have easily been able to maintain stable operations with power increases of 20% and reductions of 13%, on the 12 pots installed with the EnPot heat exchangers and are currently only limited by the impact on the rest of the pots in the line, which do not have EnPot.

We have proven that when modulating power the pots with EnPot installed operate with approximately 1 DCkWh/ kg lower energy consumption than pots without EnPot, which is a huge saving,” he says.

  Roman says that under normal operating conditions with normal line amperage, the pots with EnPot installed have outperformed the rest of the pots in the line with 0.25 DCkWh/kg lower energy consumption and 0.4% higher current efficiency. “These results underpin our confidence in the EnPot technology and we are confident we will realize our goal of ± 25% energy usage when we have it on the whole potline,” he says. Read More about TRIMET's goal to become the energy bridge between supply and demand in the German national grid.

 

Roman says that under normal operating conditions with normal line amperage, the pots with EnPot installed have outperformed the rest of the pots in the line with 0.25 DCkWh/kg lower energy consumption and 0.4% higher current efficiency.

These results underpin our confidence in the EnPot technology and we are confident we will realize our goal of ± 25% energy usage when we have it on the whole potline,” he says.

Read More about TRIMET's goal to become the energy bridge between supply and demand in the German national grid.


EnPot outperforms normal cells in TRIMET power outage

In April 2016 TRIMET had a power outage lasting a number of hours. The cells fitted with EnPot had less difficulty in being restarted than the cells without EnPot. The TRIMET outage proves EnPots value in the case of a serious power outage, that pots can be kept warmer for longer, and that restarting is less problematic.

THE 'VIRTUAL BATTERY' – OPERATING
AN ALUMINIUM SMELTER WITH FLEXIBLE ENERGY INPUT

Read the 2016 TMS Conference paper presented by N. Depree, R. Düssel, P. Patel, T. Reek
Light Metals Research Centre, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand. TRIMET Aluminium SE, Aluminiumallee 1 Essen, Germany

EnPot proves to be robust and reliable

The installed EnPot system has proven to be robust, stable and reliable with no major equipment failures or problems since start up.

The system responds quickly to set point changes and the reproducibility of the system outputs such as air flow rates and heat extraction is high. This has meant that the outcomes of any set point changes can be predicted and the system is readily customisable and controllable to changing conditions.