STEEL BELT CONVEYORS FOR SEVERE CONDITIONS since 1929

SUEZ ENERGY ANDINO S.A.

THE CHALLENGE

Since 1997, two MAC® (Magaldi Ash Cooler) dry bottom ash handling systems have been successfully applied under the pulverized coal-fired boilers #CTM1&#CTM2 of the Mejillones power plant, owned by E-CL (former Edelnor), a company that belongs to ENGIE (former GDF Suez), the same owner of the Andina power plant. The reliability of the two MAC® systems installed at the Mejillones power plant, field-proven by thousands of hours of continuous trouble-free operation without causing any boiler shutdown, convinced Cobra Instalaciones y Servicios S.A., the EPC company for the construction of the Andina power plant, to award in 2009 a contract to Magaldi Power for the supply of a complete solution for the dry bed ash removal from 2x165MW circulating fluidized-bed (CFB) combustion boilers.
The two steam generators, the auxiliary equipment and the relevant advisory services for erection and commissioning were supplied by Foster Wheeler. The boilers were designed to burn imported bituminous coals and/or pet-coke and, as an option, also some types of biomass. Commercial operation of the greenfield started in the second half of 2010.

 

THE CUSTOMER

Cobra Instalaciones y Servicios S.A., the leading industrial sub-holding company of the Spanish ACS Group, has more than 30,000 employees in over 45 countries and offers a wide range of services through more than 300 branches, providing added value to all kinds of Clients, from individuals to large corporations. In 2008 Cobra Instalaciones y Servicios S.A. was contracted by E-CL for the turn-key Andina power plant project. E-CL is a Chilean utility company based in Santiago and formerly known as Edelnor. E-CL is the main electric generator of the Northern Interconnected System (it represents around 50% of the interest of SING) and is the fourth company at a national level regarding installed capacity, with a 2,129 MW gross power.
The company's activities include the production, transportation and distribution of electric energy and natural gas; the purchase, sale and transportation of liquid, solid and gaseous fuels; and the provision of engineering consulting services. The company's products and services are mainly oriented towards mining companies and other industries operating in the north of Chile. The company is a subsidiary of the French company ENGIE (former GDF Suez).

 

THE SOLUTION

Magaldi is a well known and reputed name in Mejillones, a little coastal Chilean city located in one of the driest areas on the planet, the Atacama Desert. In December 2009 Cobra Instalaciones y Servicios S.A. awarded a contract to Magaldi Power for the dry bed ash transportation and storage system for their greenfield, comprising 2x165 MW circulating fluidized-bed (CFB) combustion boilers, located at the Andina power plant in Mejillones, in the north of Chile. The scope of supply referred to the dry bed ash handling system from the discharge of the screw coolers to a 950 cum storage silo.
The system is based on a longitudinally aligned Magaldi Ecobelt® steel conveyor belt belt, that receives the bed ash discharged by 5 screw coolers directly fitted under the boiler drain pipes. During ash conveying, a controlled amount of ambient air enters the Ecobelt® to further cool down the bed ash. Infact, the Magaldi conveyors can withstand temperatures higher than any other competitive conveyor without any problem. In the case of the Andina project this was a key-factor in the selection of the Ecobelt® conveyor instead of the conventional Apron-based and chain conveyors, which may suffer in cases where the ash temperature is higher than 300 °C, leading to mechanical problems such as hasty corrosion and/or chain breakages.

 

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