Tube bundle apparatus for processing corrosive fluids

B - Operations – Transporting – 01 – J

Patent

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Details

B01J 19/02 (2006.01) B01J 19/24 (2006.01) F28D 3/02 (2006.01) F28F 19/06 (2006.01)

Patent

CA 2484376

Tube bundle apparatus for thermal exchange operations at high pressures and temperatures, under conditions of high aggressiveness of the process fluids, wherein the tube bundle comprises a series of tubes (4) whose internal wall is essentially constituted by a material selected from titanium, zirconium or an alloy of one of these, resistant to the aggression of said fluids, in which at least one of the access chambers to the tube bundle is DELIMITED by a wall comprising at least the following three metallic layers in succession: a) an external layer (21) suitable for tolerating the pressure load, subject to corrosion by contact with said highly aggressive process fluid; b) an intermediate layer (22) made of stainless steel; (c) an anticorrosive lining (23) in contact with said highly corrosive fluid, consisting of a material selected from titanium, zirconium or an alloy of one of these. Said apparatus is particularly used as ex- changer/reactor, for example as a stripper, in the high pressure cycle of synthesis processes of urea.

L'invention concerne un appareil à faisceau de tubes destiné à des opérations d'échange thermique à des pressions et des températures élevées, sous des conditions d'agressivité élevée du fluide à traiter. Le faisceau de tubes comporte une série de tubes (4) dont la paroi interne est essentiellement réalisée dans un matériau choisi parmi titane, zircon ou un alliage de ceux-ci résistant à la corrosivité desdits fluides, au moins une des chambres d'accès au faisceau de tubes étant délimitée par une paroi comportant successivement au moins les trois couches métalliques suivantes : a) une couche externe (21) pouvant supporter la charge de pression, exposée audit fluide corrosif à traiter, b) une couche intermédiaire (22) réalisée en acier inoxydable, c) un revêtement anticorrosion (23) exposé audit fluide corrosif, réalisé dans un matériau choisi parmi titane, zircon ou un alliage de ceux-ci. L'appareil selon l'invention peut notamment servir d'échangeur/réacteur, par exemple de décapant, dans le cycle haute pression de la synthèse d'urée.

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