Flat tube heat exchanger

Abstract

The invention relates to a flat tube heat exchanger, in particular to a high-temperature flat tube heat exchanger for gaseous media, comprising a closed housing (5) having a tube bundle space (50) and a tube bundle, arranged in the tube bundle space (50) of the housing (5), comprising multiple flat tubes (2), there being arranged, in the flat tubes (2) and in the tube bundle space (50) between the flat tubes (2), corrugated strips (3, 6) having peaks (30, 60) and troughs (31, 61) extending in the longitudinal direction of the flat tubes (2), wherein the peaks (30, 60) and troughs (31, 61) respectively bear internally and externally against flat sides (200) of the flat tubes (2), and wherein there is provided a device for externally applying a surface pressure to the housing (5), at least in the region of the tube bundle space (50), this pressure being higher than a pressure (p1, p2) of the media guided in the flat tubes (2) or around the flat tubes (2).

1 . A flat-tube heat exchanger, in particular for gaseous media, comprising a closed housing having a tube bundle space and a tube bundle which is arranged in the tube bundle space of the housing and which comprises a plurality of flat tubes, wherein corrugated bands having peaks and troughs extending in a longitudinal direction of the flat tubes are arranged in the flat tubes and in the tube bundle space between the flat tubes, wherein the peaks and troughs bear internally or externally against flat sides of the flat tubes, and in that provision is made of an apparatus which is suitable, and configured, for externally applying a surface pressure to the housing, at least in the region of the tube bundle space said surface pressure being higher than a pressure of the media guided in the flat tubes or around the flat tubes. 
     
     
         2 . The flat-tube heat exchanger as claimed in  claim 1 , wherein a surface pressure which is about 1 bar to about 4 bar higher than a pressure of the media guided in the flat tubes or around the flat tubes is applied to the housing by means of the apparatus. 
     
     
         3 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the corrugated bands have a sinusoidal, triangular or sawtooth wave shape. 
     
     
         4 . The flat-tube heat exchanger as claimed in  claim 1 , wherein a width of the corrugated bands which are arranged in the flat tubes is at least equal to a width of the flat sides of the flat tubes. 
     
     
         5 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the peaks and troughs of the corrugated bands bear freely against flat sides of the flat tubes. 
     
     
         6 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the apparatus comprises a casing housing which accommodates the housing, wherein the casing housing surrounds the housing, at least in the region of the tube bundle space, with a spacing so as to leave a pressure space. 
     
     
         7 . The flat-tube heat exchanger as claimed in  claim 6 , wherein the casing housing is in the form of a pressure vessel having a connection for media supply and/or media discharge, wherein a pressure in the pressure vessel can be regulated by media supply and/or media discharge. 
     
     
         8 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the apparatus comprises a pair of bars and/or plates having two flexurally rigid bars or plates which are movable relative to one another and which are connected by means of tie rods, wherein at least one portion of the housing is arranged between the bars or plates of the pair of bars and/or plates. 
     
     
         9 . The flat-tube heat exchanger as claimed in  claim 8 , wherein the apparatus comprises a casing housing, wherein the casing housing surrounds the housing, at least in the region of the tube bundle space, with a spacing. 
     
     
         10 . The flat-tube heat exchanger as claimed in  claim 9 , wherein thermal insulation is provided between the casing housing and the housing. 
     
     
         11 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the flat-tube heat exchanger is constructed in the form of a rectangular arrangement with a cuboid tube bundle space and with a plurality of flat tubes arranged in rows and columns. 
     
     
         12 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the corrugated bands are at least partially coated with a material acting as a catalyst. 
     
     
         13 . The flat-tube heat exchanger as claimed in  claim 1 , wherein, as viewed in the longitudinal direction, in each case at least two corrugated bands are arranged so as to run oppositely in the flat tubes. 
     
     
         14 . The flat-tube heat exchanger as claimed in  claim 13 , wherein transverse ribs are arranged between two adjacent corrugated bands. 
     
     
         15 . The flat-tube heat exchanger as claimed in  claim 1 , wherein the flat tubes are each composed of at least two flat tube pieces which each extend in the longitudinal direction. 
     
     
         16 . The flat-tube heat exchanger as claimed in  claim 9 , wherein pressure rams for force transmission are arranged between the casing housing and the housing.