Competitiveness

Steel from Cogne heats Aosta and the steel industry is more sustainable

Made with Telcha, it will transfer heat from the furnace to district heating. Cogne Acciai Speciali General Manager Pirovano: 'It testifies to our desire to innovate'. Telcha president Moioli: "A virtuous example of circular economy".

by Carlo Andrea Finotto

(Imagoeconomica)

3' min read

3' min read

Five million euro investment to complete a project that avoids the emission of over 11 thousand tonnes of CO2. These are, in a nutshell, the figures relating to the heat recovery plant that has seen the virtuous collaboration between Cogne Acciai Speciali and Telcha, a company of the Engie group that deals with district heating in Aosta. The plant was inaugurated a few days ago and represents a further important step in the path that the Valle d'Aosta steel company has been following for some time on the road to sustainability.

"We are proud of this heat recovery plant, the result of a project that represents a concrete step towards sustainability and the reduction of emissions in Valle d'Aosta," confirms Monica Pirovano, general manager of Cogne Acciai Speciali.

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It all started about a year ago, when the steel company and Thelca signed an operating agreement. The aim was to exploit the excess heat from industrial activities to feed the district heating networks in a more sustainable and efficient way; to achieve this, it was essential to recover the heat from the steelworks' melting furnace and transfer it to the Aosta district heating network.

The plant, scheduled to come into operation in 2023, is the first to be built in the region, which is also why its presentation was attended not only by the top management of the two companies - in addition to Monica Pirovano, CEO of Cogne Acciai Speciali, Telcha CEO and president Fabrizio Moioli - but also by institutional representatives Luigi Bertschy, vice-president of the region and councillor for economic development, training and employment, transport and sustainable mobility, and Gianni Nuti, mayor of Aosta.

This is, says Fabrizio Moioli, 'a virtuous example of circular economy where unused thermal energy is transformed into a valuable resource for the city's district heating network. This approach,' the manager continues, 'not only reduces CO2 emissions but also contributes to improving energy efficiency and urban sustainability, offering tangible benefits for the environment and the local community and representing a concrete lever for the country's ecological transition.

Another not insignificant aspect of the Valle d'Aosta project was the ability of those involved to respect the timetable. 'Meeting the announced timeframe,' emphasises Monica Pirovano, 'is further proof of our desire to innovate in the steel sector in a responsible manner, implementing industrial solutions that meet the environmental needs of today and tomorrow. We are convinced, and above all we hope, that this initiative will inspire other industrial realities to explore similar solutions'.

In detail, the district heating plant, already supplied since its activation by a cogeneration plant integrated with a low-temperature heat recovery system (about 20°C) from the cooling water of the steelworks, is now also supplied by the high-temperature recovery (about 90°C) of the smelting furnace of the industrial plant. To achieve this, the steel mill modified its system for conveying the fumes generated in the smelting furnace in order to recover excess heat by means of a closed-circuit cooling system with water at 90°C and transfer it to the district heating plant via 1.2 km of piping built by Telcha to connect the steel mill to the district heating plant.

'Thanks to this collaboration,' Pirovano explained, 'we are contributing significantly to the decarbonisation of the entire district heating system. This achievement is not only a success for Cogne Acciai Speciali and Telcha, but an added value for the entire community in Valle d'Aosta. Telcha's use of the heat recovered from Cogne Acciai Speciali's circuits avoids more than 11,400 tonnes of CO2 emissions each year, corresponding to the environmental benefit of approximately 228,000 trees planted.

Today, Aosta's district heating network has a 35 km infrastructure powered by a cogeneration and heat pump plant that produces 80 GWh of thermal energy per year for about 400 users. The numbers, however, are destined to grow.

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