Siemens awards water treatment contract for new Severn Power station
10 Jun 2009
Reading, UK - Siemens AG Energy Sector has awarded Watercare International of Reading a contract to provide the boiler make-up and condensate polishing water treatment plants for the new Severn Power generating station, owned by DONG Energy.
The boiler make-up plant, which will achieve the stringent make-up water requirements specified by the VGB standards, is rated at 16 m3/h. Each of the project’s two condensate-polishing plants has a capacity of 440 m3/h, and whilst operating in the ammonia cycle, will deliver polished condensate water with low levels of sodium, again in line with VGB standards.
The Severn Power generating station is an 850 MW CCGT (combined cycle gas turbine) power station that is being built on the site of the former Uskmouth A power station in South Wales. The new station has been specifically designed to have minimum environmental impact.
This has led to the adoption of super-critical (once-through) boiler plant and air-cooled condensers. Installations of this type benefit greatly from being used in conjunction with a condensate polishing system that can consistently deliver water with extremely low sodium content.
“Severn Power has been specifically designed to minimise its environmental impacts, and a key aspect of this is to ensure that no water is taken from, nor discharged into, the river Usk.” said Richard Tyreman, project director of Severn Power
To achieve the required performance, Watercare is to supply an externally regenerated condensate polishing system with resin transfer between two cartridge-filtration, mixed-bed operator condensate polishing sets and a common multiple vessel regeneration plant. This condensate polishing plant, which operates in the ammonia cycle, is said to be the first of its kind to be built in the UK for over 20 years.
The boiler make-up water treatment plant for the project, which takes its input from a challenging and variable feed water supply, incorporates media filtration, a reverse osmosis membrane system and ion-exchange polishing technologies, said Watercare.
