STEEL BELT CONVEYORS FOR SEVERE CONDITIONS since 1929

ENEL

THE CHALLENGE

Enel Produzione S.p.A. is a subsidiary of Enel S.p.A., the biggest energy group in Italy. Enel Produzione owns the new Torrevaldaliga Nord power plant, a high-efficiency coal plant consisting of 3x660 MW units for an overall power capacity of 1,980 MW. Due to the array of technologies, structures and equipment used for the benefit of production efficiency and the environmental impact, it represents one of the most advanced coal plants in the world.
For those reasons Magaldi Power was awarded a contract by Enel to provide the MRS® (Magaldi Mill Rejects System) to mechanically handle, in a dry way, the rejects from the coal mills.

 

THE CUSTOMER

Enel Produzione S.p.A. owns and operates thermal, hydroelectric, geothermal, and wind power generation plants in Italy. The company also provides fuel logistics and renewable energy-related services. Enel Produzione is the owner of Torrevaldaliga Nord TPP, located about 60 km to the north of Rome.
Torrevaldaliga Nord with its 3x660 MW ultra-supercritical boilers is one of the most advanced clean coal fired power plants in the world, adopting the best available technologies in terms of boiler material selection and boiler emission abatement. The Units started their commercial operation between 2009 and 2010 and burn imported coals.

 

THE SOLUTION

Following the approach to adopt the best available technologies for the new Torrevaldaliga Nord power plant, Enel selected Magaldi Power for the design, supply and erection of 3 MRS® systems to mechanically handle, in a dry way, the rejects from the coal mills. At Torrevaldaliga Nord TPP each Unit is equipped with 6 coal mills (bowl type). The rejects are discharged from the coal mills into the “pyrite boxes” for temporary storage. Each pyrite box is provided with 2 knife gate valves, at inlet and outlet flanges, to disconnect the mill (at positive pressure) from the downstream equipment (at atmospheric pressure).
The rejects are intermittently extracted from the pyrite boxes by short MRS® conveyors and dosed to the main MRS® conveyor, which receives the rejects produced by all 6 coal mills. Then the material is loaded through a bucket elevator into a 15 m3 storage silo.
The MRS® systems were designed to meet both the provisions of Directive 94/9/EC, commonly referred to as ATEX ("Atmosphères Explosibles") products directive, and the requirements of the Italian Fire and Rescue Authority. 
Each MRS® system is integrated with:

The MRS® systems handle about 100 kg/h of rejects in a normal operation, produced by each coal mill, and up to 2,500 kg/h during a mill trip.

 

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