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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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    Coal fired power stations installed Flue Gas Desulphurisation plants, passing the flue gas through limestone, to remove sulphur dioxide.  Initially this was an expensive exercise until someone found out that by forcing the oxidation a little further the end by-product was about 97% pure gypsum which could be sold to make plasterboard.  In the UK alone at least 500,000 tons per year of it is used in this way.  The FGD gypsum comes from power stations all over Europe who sell this by product to the plasterboard manufacturers for a tidy sum.
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    Coal fired power stations installed Flue Gas Desulphurisation plants, passing the flue gas through limestone, to remove sulphur dioxide.  Initially this was an expensive exercise until someone found out that by forcing the oxidation a little further the end by-product was about 97% pure gypsum which could be sold to make plasterboard.  In the UK alone at least 500,000 tons per year of it is used in this way.  The FGD gypsum comes from power stations all over Europe who sell this by product to the plasterboard manufacturers for a tidy sum.
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