TEDAGUA to treat the water required for operation of the Mittelsbüren Combined Cycle Plant in Bremen (Germany).
In December 2010 the Industrial Plant division of Cobra Instalaciones y Servicios, in conjunction with General Electric (GE), was awarded the contract for the supply and construction of the Mittelsbüren Combined Cycle Power Plant (CCPP), valued at more than 300 million euros. The project is being developed by the German group SWB, specifically, by its subsidiary SWB Erzeugung GmbH & Co. KG which belongs to the EWE holding. The plant is located on the outskirts of the German city-state of Bremen, in northwest Germany, next to the existing power plant owned by SWB.
The new plant will have a rated output of 450 MW and is expected to provide power to approximately 500,000 homes when it goes into operation at the beginning of August 2013. 165 MW have also been reserved to cover the needs of Deutsche Bahn, Germany’s main national railway operator. The Plant has been planned and designed for fully automatic operation including plant start-up and shutdown.
The construction consortium has selected TEDAGUA for the design, construction, commissioning, control and programming of the water treatment facility required for proper operation of the combined cycle plant. The plant needs water for the wet cell cooling towers used to emit unused heat to the atmosphere in the form of warer vapour. It will also be necessary to offset other much smaller water losses incurred when deionizing water for the hydrological and steam cycle during the generation process. The total amount of water required, a maximum of around 700 m3/h, will be taken from the Weser River next to the combined cycle plant.
A maximum pretreatment flow of 554 m3/h (flotation and filtration) and 20 m3/h of demineralized water will be provided by the plant. To do so the solids content must be reduced to less than 3 mg/l and a decarbonation tower with sulphuric acid dosing will be installed to protect the equipment from rain and contaminants. Pretreatment, based on lamellar clarification and sand filters, is designed on the 1x100% criterion.
The plant will be divided into two separate parts, one of which will provide the service water and the other the demineralized water used to generate electricity in the turbine. The first uses lamellar clarification pretreatment and dual-layer silex-anthracite filtering. The second consists of ultra-filtration, reverse osmosis with preliminary filtering cartridges and mixed-bed filters.
This new contract represents the consolidation of TEDAGUA’s industrial division in like Germany, a country with very high technical standards.