Siemens Aktiengesellschaft

Werner Nieschler

Hans Juergen Mayer

A steam generator has a preheater for preheating feed-water supplied from an external source, the preheater receiving its heat from the steam generator's heat exchanger. If the supply of feed-water to the steam generator is reduced while the heat exchanger maintains its heat output, the feed-water is overheated. To prevent this, some of the already heated feed-water in the steam generator is fed to the feed-water entering the preheater, this raising the feed-water's temperature relative to the temperature of the heat exchanger, reducing the rate of exchange of the heat from the heat exchanger to feed-water in the preheater, and by this control preventing overheating of the water in the preheater.

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Erlangen, Germany

Werner Nieschler