Temperature holding device for water collecting vessels of once-through steam generators

US4261301A · kind A · utility

Assignee

• Kraftwerk Union Aktiengesellschaft · DE

Inventors

• Georg Losel · Uttenreuth, DE
• Werner Emsperger · Erlangen, DE

Key dates

• Filing date: Apr 25, 1979
• Grant date: Apr 14, 1981
• Expiry date: Apr 25, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F22B29/12
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

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.