Seabank Power Station, Great Britain


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The challenge was big: For the gas and steam power station in Bristol, Great Britain, that went on stream at the end of the year 2000, the waste water of a near-by sewage plant had to be used as cooling water. Siemens PLC, the designer of the 750 megawatt Seabank Power Station, engaged Grundfos Alldos for this complex and extensive task in chemical engineering. Start of the gigantic project was July 1999 comprising the complete engineering, delivery, installation and finally commissioning on schedule. The result was a plant, which is unequalled in its dimension and safety premises worldwide.

The Grundfos Alldos engineers and technicians had to plan in two dimensions. Main task: the treatment of the cooling water. Three ClO2 systems disinfect the extremely polluted water of the sewage plant, which is conveyed back into the plant after the cooling procedure. Chlorine dioxide was chosen as disinfection agent, because of it's special chemical characteristics in organically polluted water.

Construction site number 2: the water-steam cycle of the of the power station. A manually controlled Trisodium-Phosphate-system prevents corrosion of the hot-water tank in case of leakages, by keeping the pH-value stable, which is essentially higher than the value of cooling water. The Hydrazine and Ammonia dosing systems are running in full-automatic permanent operation and provide the correct Oxygen content and the correct conductivity.

Stand-by modules guarantee absolute safety against failures in both sectors. The consumption control and command of dosing are made automatically by PLC and process visualisation, indicating all flows and levels optically. A modem connection is the prerequisite for quick service intervention.

Customer's plant:
ClO2 system in 24-hours operation

Technical features:
Water quantity (cooling water and additional water): 16.233 kg/second

Treatment process:
HCl and NaClO2

a) Cooling water and additional water:
Treatment and dosing:

  • 3 ClO2 systems including tanks, pumps with a total capacity of 20 kg/Std. (1x10 kg/h, 2x5 kg/h)
  • 2 sulphuric acid systems, measuring systems for ClO2 , pH, redox, chlorite, m-value

b) Water-steam cycle:
Dissolving and dosing station, high-pressure dosing:

  • 2 trisodium phosphate systems, with 15 pumps;
    Pump capacity: 10-20 l/h, up to 200 bar
  • 2 hydrazine and ammonia systems with 6 pumps each;
    Pump capacity: 10-20 l/h, up to 200 bar

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