Temperature holding device for water collecting vessels of once-

Details Temperature holding device for water collecting vessels of once- Temperature holding device for water collecting vessels of once-

1979-04-25

1981-04-14

Favors, Edward G.

Liquid heaters and vaporizers

Circulation

With start-up operations

122406ST, 122429S, F22B 2912

Patent

active

042613019

ABSTRACT:
In a temperature holding device for water collecting vessels of steam generators operable in once-through and circulating operation, having a feed-water line leading to the once-through steam generator, an evaporator and a superheater heating surface in the feed-water line, water-steam separating vessels intermediate the evaporator and superheater heating surface, a return line for returning water from the separating vessel to the feed-water line, a circulating pump and a first valve arrangement in the return line, a warm-up line having one end connected to the feed-water line before the evaporator, and another end connected to the return line intermediate the circulating pump and first valve arrangement, and a second valve arrangement in the warm-up line. A common water collecting vessel connected to outlets on the water side of the separating vessels by partial lines of the return line, a steam line connected from the steam side of the common water collecting vessel to an input of the superheater heating surface, and a shut-off valve in the steam line being closable in once-through operation and openable in circulating operation.

REFERENCES:
patent: 3019774 (1962-02-01), Beyerlein
patent: 3135096 (1964-06-01), Schroedter
patent: 3411300 (1968-11-01), Schuetzenduebel et al.
patent: 3464393 (1969-09-01), Chambers
patent: 3954087 (1976-05-01), Stevens et al.
patent: 4068475 (1978-01-01), Binstock
patent: 4099384 (1978-07-01), Stevens et al.

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