Once-through steam generator and method for starting up a...

F - Mech Eng,Light,Heat,Weapons – 22 – B

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F22B 29/06 (2006.01) F22B 35/14 (2006.01)

Patent

CA 2287177

The invention relates to a continuous-flow steam generator (1) designed in a two-pass construction style. A second gas pass (14) is connected downstream from a first gas pass (8) on the side of the heating gas via a horizontal gas pass (12). In a steam generator (1) of this kind, which should have a particularly long service life even if it is frequently started, a number of parallel-connected steam generating pipes (16) for a fluid medium to flow through are interconnected giving an evaporator heating surface (22) which is part of an encompassing wall (6) of the first gas pass (8). The steam- generating pipes (16) forming the evaporator heating surface (22) discharge on the output side into a common outlet collector (24) which is fitted at low height in relation to an under edge (44) of the horizontal gas pass (12). A bulkhead heating surface (26) is connected downstream from the outlet collector (24), on the side of the fluid medium.

L'invention concerne un générateur de vapeur à flux continu (1) du type à deux passages. Un deuxième passage de gaz (14) est monté en aval d'un premier passage de gaz (8) côté gaz chauds par l'intermédiaire d'un passage de gaz horizontal (12). Dans un générateur de vapeur (1) de ce type, lequel doit avoir une durée de vie particulièrement longue même en cas de démarrages fréquents, un certain nombre de tuyaux (16) du générateur de vapeur, reliés en parallèle pour la circulation d'un milieu en écoulement, sont interconnectés pour former une surface chauffante d'évaporation (22) faisant partie d'une paroi périphérique (6) du premier passage de gaz (8). Les tuyaux (16) formant cette surface chauffante d'évaporation (22) débouchent côté sortie dans un collecteur de sortie commun (24) monté plus bas par rapport à un bord inférieur (44) du passage de gaz horizontal (12). Une surface chauffante de cloison étanche (26) est montée en aval de ce connecteur de sortie (24), côté milieu en écoulement.

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