Liquid heaters and vaporizers – Indirectly heated – Separate fluid
Patent
1974-11-26
1976-02-24
Sprague, Kenneth W.
Liquid heaters and vaporizers
Indirectly heated
Separate fluid
165163, F22B 106
Patent
active
039398056
ABSTRACT:
A pressurized-water reactor steam generator has a preheater surrounding the cold leg of its U-tube bundle heat exchanger, the preheater discharging being separated by a horizontal partition into upper and lower sections which are each connected with its own feed-water inlet and which respectively discharge the preheated feed water upwardly and downwardly. When the generator is operated under low-load conditions, the feed water supplies are cut off from the two preheater sections, resulting in possible boiling of the water in the preheater because of the lack of circulation through the preheater. To prevent such boiling, means are provided for interconnecting the two preheater sections in series, around the horizontal partition, so that feed water can by thermal action circulate upwardly through the preheater, bypassing its partition, the water entering what would normally be the downwardly discharging outlet of the preheater and going upwardly, bypassing the partition and upwardly through the preheater's upper section so as to be discharged upwardly.
REFERENCES:
patent: 3706301 (1972-12-01), Penfield, Jr.
patent: 3719172 (1973-03-01), Charcharos et al.
patent: 3766892 (1973-10-01), Webster
patent: 3807365 (1974-04-01), Lyman et al.
Kraftwerk Union Aktiengesellschaft
Sprague Kenneth W.
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