CATANIA FACTORY

ACCIAIERIE DI SICILIA

PROJECT REFERENCE

COMPANYPart of Alfa Acciai Group since it was established in 1998, Acciaierie di Sicilia has a production capacity of about 500,000 tons/year of rod irons for reinforced concrete in bars and rolls, obtained by electric furnace melting of scrap iron coming exclusively from Sicily.

Thanks to its size, the technology it uses and its products, the Company is a major player in the European iron and steel industry and within Alfa Acciai Group it is the natural market reference for Southern Italy and the Islands.

Over the last years Acciaierie di Sicilia has launched a significant investment plan, mainly aimed at increasing efficiency in production and organization and achieving high environmental performances.

Acciaierie di Sicilia committed to improving the environmental impacts resulting from its processes by installing a new dust exhaust and reduction system for the melting furnace and a new exhaust hood.

The new fume treatment plant has a filtering surface of 12,000 m2 and with its innovative pulse cleaning system it can reach minimum emission levels, well below legal limits. Such an important action, together with the ability to manage the process, enables the Catania factory to be an environmentally-friendly site. Therefore, today Acciaierie di Sicilia can be an excellent reference in terms of environmental matters in Sicily.

ALSTOM PLANT

In 2010 Alstom Power Italia implemented measures for Acciaierie di Sicilia to revamp its facilities in the following plant areas.

Hood

A new high collection capacity canopy hood was realized by Alstom on top of the electric furnace. Incorporating all the dimensional and fluid-dynamic parameters of the building, the new hood was designed with the support of sophisticated mathematical models developed by Alstom (CFD). The new hood, replacing the existing one, collects fumes generated while the scrap is loaded into the furnace. The high collection capacity of the hood helps to clean air inside the steelworks, improving its comfort, and prevent fumes from being released to the external environment (diffuse emissions).

Secondary fume circuit

A new network of secondary fume exhaust ducts was realized with a more rational development. Thanks to an accurate analysis of the circuit’s critical points (gates, radiuses of curvature) any source of energy losses due to the circuit was identified, analyzed and reduced to the minimum. The result was a new network of low energy impact exhaust ducts.

Filter and exhaust unit

A new Alstom filter and exhaust unit was installed to replace old filters. Based on advanced technology, the new unit’s collection capacity is 1,400,000 m3/h. The unit consists of a bag filter, 3x1,600 kW motor-fans that ensure the right capacity at the necessary negative pressure and an exhaust chimney.

The filter is equipped with 8-metre-long filter bags and occupies a very limited footprint. The Alstom filter was developed by the Vaxjo research centre (S) based on minimum energy impact criteria. The bags are cleaned by Alstom Optipow® valves in On-line mode and using low-pressure compressed air (2-3 bar). The amount of compressed air needed by the innovative Alstom cleaning system is generally 10 times less than the amount needed by standard systems. The existing compressed air production station becomes even redundant and the use factor is reduced.

The 3 fans are controlled by low-voltage electric motors regulated by inverters (VVVF). These devices help to always have the best capacity regulation, configuring the system in such a way as to set the exhaust required for every single production stage.

Since it reduced power consumptions (per ton of steel produced) as a result of the use of Alstom low energy impact technologies (new ducts, bag filter, compressed air consumptions and inverters), Acciaieria di Sicilia was granted white certificates by the Energy Entity.

BENEFITS OF THE ALSTOM SOLUTION

• Highly effective canopy hood (better environmental conditions

inside the building)

• Removal of any leaks to the external environment (diffuse

emissions)

• Minimum space occupied by the filter (according to the space

available)

• Channelled emissions well below the limits prescribed by

Authorities (< 1 mg/Nm3 at chimney)

• Very low plant maintenance costs

• Reduced energy costs in the plant management (White

Certificates obtained (TTE))

ALSTOM POWER

ALSTOM POWER ITALY

ALSTOM POWER In the world one bulb out of four is powered thanks to Alstom technologies.

Alstom is the world’s leader in energy production, with a product portfolio covering any kind of fuels, including fossil and nuclear fuels and fully renewable sources.

25% of the world’s energy production capacity depends on Alstom technology and services.

Alstom Power is organized in two sectors, Thermal and Renewable, and it is a major player with innovative technologies that provide clean, efficient, flexible and integrated energy solutions, both for design and production and for supply and maintenance. Operating in 70 countries, Alstom Power supplies customers worldwide.

ALSTOM POWER ITALY Alstom’s Italian Power sector has any necessary skill to design, realize and supply maintenance and revamping of energy production plants and components and solutions to control environmental pollution for the industry. With the broadest range of products and services developed respecting the environment, it has a product portfolio and cutting-edge technologies that give an excellent contribution in the realization of plants to produce energy from the following sources: hydroelectric, wind, solar, coal, gas and nuclear.

The AQCS Division, operating in the Thermal Service area, provides environmental solutions and services to the utilities and the industry markets.

With a broad portfolio of products and technologies, Alstom Power Italia provides its customers with customized solutions, always in line with the best available technologies (BAT) and aimed at achieving the best performances at the lowest cost.

Alstom Power products and technologies to control environmental emissions are applied in the following industries:

• Steelworks and foundries • Glassworks

• Non-ferrous metals • Thermal power plants

• Cement factories • Waste-to-energy plants

Particolarmente attiva nel campo dell’industria siderurgica, Alstom Operating especially in the iron and steel industry, Alstom Power Italia installed filter and exhaust systems for: electric furnaces, converters (AOF and BOF), blast furnaces (cast-houses, stockhouses), coke plants, sinter plants, in Italy and abroad.

Alstom Power S.p.A.Via Tommaso Edison, 5020099 Sesto San Giovanni, Milan Tel. +39 02 243481Fax +39 02 243482077

www.alstom.com