Steam condensing apparatus with freeze-protected vent condenser

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

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F28B 9/08 (2006.01) F28B 1/06 (2006.01) F28B 9/10 (2006.01)

Patent

CA 2202076

A two-stage steam condenser that prevents freezing from occurring in the tube rows by continual purging of the tube rows. Such continual purging prevents any steam from back-flowing into a tube row thereby eliminating the possibility that condensate or noncondensable gases will become trapped therein. This is achieved by isolating each of the tube rows in the second stage of the condenser so that the pressure of one tube row is not exposed to the pressure occurring in another adjacent tube row. The condensate collected in the various tube rows of this second stage is delivered to a common drain pot that is hydraulically balanced to accommodate the various pressures in these tube rows. Such hydraulic balancing also prevents any back-flowing from occurring from one tube row into another. Furthermore, in this second stage of the steam condenser, the steam and resulting condensate both flow concurrently downward while any noncondensable gases are vented counter-currently upward against such steam and condensate flow.

Condenseur de vapeur à deux étages prévenant la possibilité de gel dans les rangées de tubes par la purge continue des rangées de tubes. Cette purge continue prévient tout retour de vapeur dans une rangée de tubes , ce qui élimine la possibilité que le condensat ou des gaz non condensables s'y retrouvent captifs. A cette fin, on isole chacune des rangées de tubes dans le deuxième étage du condenseur de façon que la pression d'une rangée de tubes ne soit pas exposée à la pression survenant dans une rangée de tubes adjacente. Le condensat recueilli dans les diverses rangées de tubes de ce deuxième étage est acheminé à un vase d'écoulement commun qui est hydrauliquement équilibré pour accommoder les diverses pressions qui se manifestent dans ces rangées de tubes. L'équilibre hydraulique prévient également tout écoulement de retour d'une rangée de tubes à une autre. De plus, dans ce deuxième étage du condenseur, la vapeur et le condensat qui en résulte s'écoulent concurremment vers le bas tandis que les éventuels gaz non condensables sont évacués vers le haut à contre-courant de l'écoulement de vapeur et de condensat.

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