Heat exchanger and, in particular, convex-bottomed steam...

F - Mech Eng,Light,Heat,Weapons – 28 – D

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F28D 7/12 (2006.01) F22B 1/02 (2006.01) F22B 37/22 (2006.01) F28D 7/06 (2006.01) F28D 7/16 (2006.01) F28F 9/02 (2006.01)

Patent

CA 2478751

The steam generator (1) comprises an outer casing (2) with an axis (8) that is in a vertical disposition when the heat exchanger is in service, a bundle of tubes having straight portions that are parallel to one another and to the axis (8) of the heat exchanger (1) inside the outer casing (2), at least one tube plate (4) having through holes, each receiving the end of a tube of the bundle, and at least one water chamber having a wall (6) that is circularly symmetrical about the axis (8) of the heat exchanger (1), the water chamber being fixed to the tube plate (4) at the bottom of the heat exchanger. The surface (14a) of the solid bottom (14) of the heat exchanger includes at least one central point disposed substantially on the axis of the heat exchanger (1) at a highest level relative to the set of points constituting the inside surface (14a) of the bottom (14) of the heat exchanger. The set of points constituting the inside surface (14a) of the bottom (14) is situated above a conical surface (23) having an apex point at the highest level central point of the inside surface (14a) of the bottom (14), an axis parallel to the axis (8) of the heat exchanger, and a half-angle at the apex of about 80°.

Le générateur de vapeur (1) comporte une enveloppe externe (2) ayant un axe (8) dans une disposition verticale lorsque l'échangeur est en service, un faisceau de tubes ayant des parties droites. parallèles entre elles et à l'axe (8) de l'échangeur de chaleur (1) à l'intérieur de l'enveloppe externe (2), au moins une plaque tubulaire (4) ayant des trous traversants dans lesquels sont fixés les tubes du faisceau et au moins une boîte à eau ayant une paroi (6) de révolution autour de l'axe (8) de l'échangeur de chaleur (1) fixée à la plaque tubulaire (4) à la partie inférieure de l'échangeur de chaleur. La surface (14a) du fond plein (14) de l'échangeur de chaleur comporte au moins un point central disposé sensiblement suivant l'axe de l'échangeur de chaleur (1) au niveau le plus haut par rapport à l'ensemble des points de la surface interne (14a) du fond (14) de l'échangeur de chaleur. L'ensemble des points de la surface interne (14a) du fond (14) est situé au-dessus d'une surface conique (23) ayant comme sommet le point central au niveau le plus haut de la surface interne (14a) du fond (14), un axe parallèle à l'axe (8) de l'échangeur de chaleur et un demi-angle au sommet de 80° environ.

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