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ArcelorMittal’s blast furnaces heat Dunkirk inhabitants

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How to divide by 4 emissions of greenhouse gases?

Dunkirk Urban Community wants to divide by 4 its emissions of greenhouse gases before 2050.
How to do it? By recovering the energy produced by the french biggest steel facility: ArcelorMittal’s blast furnaces.


The solution? Recover the energy used by ArcelorMittal’s blast furnaces to produce steel.

ArcelorMittal uses lots of energy to produce steel. The idea is to reuse the generated heat to boil water and inject it in the urban heating network.

In its industrial process, the 25 miles long heating network of Dunkirk heats the city hall, a swimming pool, the university, a shopping mall and thousands of housing units.

How does it work ?

A heating network is a communal heating system for a district, a city or a conurbation that is supplied by local energies. The boiler room produces heat which is injected in the network to provide heating and hot water to buildings. It transforms various energy sources, among which a growing part is renewable or salvage : industrial or waste incineration unavoidable energy, biomass, geothermal, etc. The heat circulates as hot water (from 70 to 180°C) or steam in a buried pipe network. This network is a loop : as soon as buildings are heated, the water is cooled and returns to the boiling room. Every connected building has a technical facility called « substation » where heat is transferred towards the building internal network which supplies flats’ taps and radiators. The urban heating networks must develop to match energy transition’s goal. Dalkia operates 328 heating networks in France.

20 000 metric tons

of CO2 avoided each year.

For Dunkirk, to be innovative is to assist its industry to enter the 21st century, to get used to energy transition while staying competitive. EXCERPT FROM A 2015 FRENCH TV NEWSCAST INTERVIEW.




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