F - Mech Eng,Light,Heat,Weapons – 22 – B
Patent
F - Mech Eng,Light,Heat,Weapons
22
B
F22B 1/18 (2006.01)
Patent
CA 2514871
The invention relates to a steam generator (1) wherein a continuous evaporating heating surface (8) is disposed in a heating gas duct (6) through which a heating gas flows in an approximately horizontal manner (x). Said continuous evaporating heating surface (8) comprises a plurality of steam- generating pipes (12) which are connected in a parallel manner enabling flowthrough of a flow medium (W), and is configured in such a manner that a steam-generating pipe (12) which is heated more than another stream-generating pipe (12) of the same continuous evaporating heating surface (8) has a higher throughput of the flow medium (W) compared to the other steam-generating pipe (12). The aim of the invention is to produce a particularly low-cost steam generator exhibiting particularly high mechanical stability with different thermal loads.According to the invention, the or each steam-generating pipe (12) respectively comprises a riser pipe piece (24) which can be cross-flown in an upward direction and which is arranged in an approximately vertical manner in relation to the flow medium (W); a down pipe piece (26) which can be cross-flown in a downward direction downstream from said flow medium side and another riser pipe piece (28) which can be cross-flown in an upward direction by a flow medium (W) and which is arranged in an approximately vertical manner downstream from the latter flow medium side. Preferably, the other riser pipe piece (28) of the respective steam-generating pipe (12) is arranged in the heating gas duct (6), when seen in the direction of the heating gas (x), between the riser pipe piece (24) associated therewith and the down pipe piece (26) associated therewith.
L'invention concerne un générateur de vapeur (1) comportant une surface de chauffage de passage d'évaporateur (8) dans un canal de gaz de chauffage (6) pouvant être parcouru par un gaz de chauffage dans un sens essentiellement horizontal (x). Ladite surface comporte une pluralité de tubes de production de vapeur (12) montés en parallèle pour le passage d'un fluide (W), conçus de telle manière qu'un tube chauffé davantage qu'un autre présente un débit supérieur de fluide de passage (W). L'invention vise à fabriquer un tel générateur de vapeur de façon économique, présentant une stabilité mécanique élevée, même dans le cas de contraintes thermiques variables. A cet effet, chaque tube (12) comporte une partie de tube ascendante (24) parcourue de façon ascendante par le fluide de passage (W), une partie de tube descendante (26) parcourue de façon descendante par le fluide de passage, montée en aval dans le sens d'écoulement, et une autre partie de tube ascendante (28) essentiellement verticale, parcourue de façon ascendante par le fluide de passage, montée en aval dans le sens d'écoulement. Cette dernière partie ascendante (28) du tube correspondant (12) est de préférence située entre la partie ascendante (24) et la partie descendante (26) dans le canal de gaz de chauffage, dans le sens de passage du gaz de chauffage (x).
Franke Joachim
Kral Rudolf
Aktiengesellschaft Siemens
Smart & Biggar
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