Coiled Heat Exchanger Having Different Materials

Abstract

The invention relates to a coiled heat exchanger having a plurality of tubes which are wound around a core tube, having a casing which delimits an outer space around the tubes, characterized in that a first and a second component of the coiled heat exchanger are composed of different materials.

1 . A coiled heat exchanger comprising:
 a plurality of tubes wound around a core tube, the tubes being made of a first material;   a casing defining a vessel around the tubes, the casing being made of a second material; and   a connecting piece for connecting the tubes to the casing, wherein the connecting piece is made of one of the first and second materials as a base material, and has a plating made of the other of the first and second materials.   
     
     
         2 . The coiled heat exchanger according to  claim 1 , wherein the first material comprises aluminum, and the second material comprises steel. 
     
     
         3 . The coiled heat exchanger according to  claim 1 , wherein an indirect heat exchange between a hydrocarbonaceous stream in one tube group of said tubes and at least one heat fluid or cold fluid in at least one other tube group of said tubes is executed. 
     
     
         4 . The coiled heat exchanger according to  claim 3 , wherein the hydrocarbonaceous stream is formed by natural gas. 
     
     
         5 . The coiled heat exchanger according to  claim 3 , wherein the hydrocarbonaceous stream is liquefied, cooled, heated and/or vaporized during the indirect heat exchange. 
     
     
         6 . The coiled heat exchanger according to  claim 1 , wherein the connecting piece is a tube base. 
     
     
         7 . The coiled heat exchanger according to  claim 6 , wherein the tube base is made of steel.