Energy possibilitiesOne way to improve environmental standards

Nils Eivind Kamfjord (NTNU/ELKEM)Halvard Tveit (ELKEM)

The worlds energy consumption is steadily growing

Source: EIA, “International Energy Outlook 2009”

Assuming a big portion of this increase coming from fossile fuels we meet challenges like limited resources and increased emissions of climate gases

On a long term basis we therefore need to address other energy sources such as

- Energy saving

- Renewable energy

- Energy recovery

Process offgases dominate the potentials

Steam3 %Water

23 %

Offgas 74 %

Source: ENOVA, “Potensialstudie for utnyttelse av spillvarme fra norsk industri”

Today's situation at some plantsEnergy released to air: 1156 GWh

Energy available in hot water:289 GWh

Developing people - creating value55 / 13

QuartsCoke/Coal Woodchip

T>1811oC

Quarts: Silicon source

Woodchip: Reduce segregation and increase porosity. Also a Carbon source.

Coke and Coal: Carbon source

Electrodes: Adds energy to the process

The silicon Process

Current energy situation – base line 10MW

To air: 115 % of EFL

In cooling water: 28.7% of EFL

To air: 27.8 % of EFL

To electricity: 21 % of EFL

In cooling water: 63 % of EFL

In cooling water: 28.7% of EFL

Possibilities in energy recovery

Current situation

Today• Hot water from plant used in

nearby industry saves energy

• The plant has major potentials in energy recovery

Possibilities

• A high utilization of energy could be obtained if energy clusters are established, thinking in other directions than district heating and energy recovery to electricity.

• Both cases, “Electricity” and “Hot water”, recovers energy equal to CO2-emissions of 870000 tons/year if produced by coal

• Realizing energy recovery projects would be a major contributor to improved environmental standards in silicon production

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ELKEM THAMSHAVNSILICON METALMICROSILICA®

ELECTRIC ENERGYDISTRICT HEATING

” The worlds most environmental, energy

effective and profitable silicon plant”

Project scope

Drum 1

Generator

Desuperheatere

Tor of Thams- offgas 2011 Turbin revision 2011

Kondenser 2011

Drum 2

Fjern varme

Sjøvann

NewModifiedExisting

Tor of Thams-seawater 2011

A B

Generator

Ovn 2

Ovn 1

Tor of Thams- Boiler 2011

Combined Production: 50 000 MT Silicon, 25 000MT Microsilica165 GWh Electric Power, 180 GWh energy recovered

Silicon and CO2

• The European Commission accepts that carbon is a chemical reductant

• There is an expressed political wish to keep strategically important industries in Europe – including silicon production

• Proposed free allowances• 75% of the CO2 emissions will be eligible for free allowances (Process

Benchmark and based on median of the emissions in the period 2005-2008)• Energy recovery to thermal energy gives extra free allowances• Energy recovery to electrical energy provides little benefit in the form of

allowances

• Elkem supports policies that contribute to improved energy standards and are continuously evaluating potential energy recovery projects

2011-11-1712

Energy released to air: 280 GWh

Electrical energyrecovered: 210 GWh

Energy availablein hot water:920 GWh

Great possibilities in improved environmetal standards

Energy available in hot water:1130 GWh

Energy released to air: 280 GWh

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