Steam generator

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

Patent

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Details

F22B 1/18 (2006.01) F02C 6/18 (2006.01) F22B 37/14 (2006.01)

Patent

CA 2449652

The invention relates to a steam generator (1, 1', 1"), in which a continuous heating surface (8, 10, 12) is located in a fuel gas channel (6) that can be traversed in an approximately horizontal fuel gas direction (x). Said continuous heating surface comprises a number of steam generator pipes (22, 50, 60) that are connected in parallel (W) for the passage of a flow medium and is designed in such a way that a steam generator pipe (22, 50, 60), which is heated to a greater extent than another steam generator pipe (22, 50, 60) of the same continuous heating surface (8, 10, 12), has a higher throughput of the flow medium (W) than the other steam generator pipe (22, 50, 60). The aim of the invention is to produce a low-cost steam generator with a particularly high level of mechanical stability, even when subjected to different thermal stresses. To achieve this, the or each steam generator pipe (22, 50, 60) has a respective downpipe section (34, 52, 62, 64), which is approximately vertical and through which the flow medium (W) can flow downwards and a respective riser pipe section (36, 54, 66, 68) connected downstream of the downpipe on the flow medium side, which is approximately vertical and through which the flow medium (W) can flow upwards.

L'invention concerne un générateur de vapeur (1, 1', 1") présentant une surface de chauffe en continu (8, 10, 12) agencée dans un carneau de gaz de chauffage (6), à travers lequel ce gaz de chauffage peut circuler dans un sens approximativement horizontal (x). Cette surface de chauffe présente un certain nombre de tubes (22, 50, 60) de générateur de vapeur, montés en parallèle et à travers lesquels un fluide (W) peut s'écouler. Cette surface de chauffe est également conçue, de sorte qu'un tube (22, 50, 60) chauffé à une température supérieure à celle d'un autre tube (22, 50, 60) de la même surface de chauffe en continu (8, 10, 12) présente un débit de fluide (W) supérieur à celui de l'autre tube (22, 50, 60). L'objectif de cette invention est de fabriquer un générateur de vapeur de ce type, présentant une stabilité mécanique particulièrement élevée même sous contrainte thermique variable, pour un coût particulièrement faible. A cet effet, chaque tube (22, 50, 60) du générateur de vapeur comprend une section tubulaire descendante respective (34, 52, 62, 64) approximativement verticale, à travers laquelle le fluide (W) peut s'écouler vers le bas, et une section tubulaire montante (36, 54, 66, 68) approximativement verticale, montée en aval de la section descendante côté fluide et à travers laquelle le fluide (W) peut s'écouler vers le haut.

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