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Summary: The creation of Powercer took place, in 2003, as a result of a process initiated by the Sociedade Central de Cervejas e Bebidas, which aimed at the improvement of the economic conditions related with the steam consumption of the plant. The first step was the elaboration of an outsourcing contract for the construction and exploitation of a new cogeneration system. For this, the Sociedade Central de Cervejas e Bebidas started negotiations with several entities, selecting Galp Power and Finerge as promoters of the project's development. The Galp Power and Finerge created the Powercer society.
Through a public tender the cogeneration system was installed, integrating the existing boilers, in a management system to produce the steam needed.
Due to the high efficiency of the cogeneration system the old boilers work in standby, they are used only to support the CHP system to cover the peaks.
Currently the production management is held by Powercer.
Aims: In the industries that produce beers and drinks the production of steam, needed in the manufacturing process, represents an important share of the plant energy consumption. The Sociedade Central de Cervejas e Bebidas industry consumes, each year, around 165,000 ton of steam. To decrease this energy consumption, the industry needed to install a new steam production system with a high energetic efficiency that allowed:
The solution was the installation of a cogeneration system that produces heat (used to produce steam) and electricity (to cover the plant electricity needs and sell the remainder to the network).
Summary of Results: The cogeneration system gives the plant a significant reduction in the steam invoice and also important improvements in the costs related with the maintenance and manufacturing process. At a technical level, with this system the plant has increased the reliability of the production, since the old boilers can work as a support of the cogeneration system.
Regarding the economic side, due to the better energetic efficiency of the CHP system, the plant decreased its energetic invoice and because the electricity produced is almost all sold to the national grid, the plant earns some money since this electricity is sold at a higher price that it is bought.
At an environmental level, the system emits less than the conventional systems to produce the same amount of electricity and the same amount of heat.
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T@W: Sustainable Energy Technology at Work (2006-2008) : Combined Heat and Power : Energy Efficient Technologies : Food Processing Industries : Heat Generation, Recovery and Use : Polygeneration : Power Generation and Use