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Cooling towers on power stations - why?

Stephen Biddle
Hi All


I was working on a power station in Oman last month and it was gas fired with condensing steam turbines - no evaporation.  This week I'm working on a coal fired one in Poland, which has cooling towers and evaporation.  Is it something to do with the gas or just that they have no water in Oman?


Thanks


Stephen
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    Cooling water leaving the condenser of a steam turbine is at about 30 degrees centigrade. Extracting useful energy from this is expensive in capital terms. A CHP plant provides heat, hot water or steam, at a higher temperature, but at the cost of reducing the amount of electricity generated i.e. the electricity generating part of the cycle is less efficient, but if the heat is used effectively the overall cycle is more efficient.

    At one time Drax power station's cooling water was used for heating greenhouses growing vegetables, tomatoes I think, but it wasn't economic and stopped.

    Lynton
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  • 0
    Cooling water leaving the condenser of a steam turbine is at about 30 degrees centigrade. Extracting useful energy from this is expensive in capital terms. A CHP plant provides heat, hot water or steam, at a higher temperature, but at the cost of reducing the amount of electricity generated i.e. the electricity generating part of the cycle is less efficient, but if the heat is used effectively the overall cycle is more efficient.

    At one time Drax power station's cooling water was used for heating greenhouses growing vegetables, tomatoes I think, but it wasn't economic and stopped.

    Lynton
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