Steam generator having feed-water preheater

Details Steam generator having feed-water preheater Steam generator having feed-water preheater

1974-01-17

1976-02-17

Sprague, Kenneth W.

Liquid heaters and vaporizers

Indirectly heated

Separate fluid

122 34, 122406R, F22b 106

Patent

active

039384730

ABSTRACT:
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.

REFERENCES:
patent: 2796050 (1957-06-01), Rehm
patent: 3380649 (1968-04-01), Roberts
patent: 3483848 (1969-12-01), Green
patent: 3672444 (1972-06-01), Lowe

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