Steam generator

Abstract

The invention relates to a steam generator (D 1, D 2 ) having a first passage, which is formed by one or more pipes (R 1, R 2 ) and through which a medium can be conducted in liquid and/or vapour form, and having a second passage (F 1, F 2 ), through which a hot gas can be conducted along the outer side of each of the pipes (R 1, R 2 ) which form the first passage. Each of the pipes (R 1, R 2 ), which form the first passage, of the steam generator (D 1, D 2 ) is surrounded by a pressure-resistant casing (M 1, M 2 ) which has a heat-insulating coating (W 1, W 2 ) on the inner side thereof and through the interior space of which the second passage (F 1, F 2 ) runs.

1 . Steam generator with a first passage that is formed by one or more tubes and through which a medium can be directed in liquid and/or vapor form, as well as a second passage through which a fuel gas can be guided along the outer side of each of the tubes forming the first passage, characterized in that each of the tubes forming the first passage is surrounded by a pressure-resistant casing that has a heat-insulating coating on its inner side and through whose inner space the second passage runs. 
     
     
         2 . Steam generator according to  claim 1 , wherein it specifically comprises a pressure-resistant casing or several pressure-resistant casings, whereby a pressure-resistant casing surrounds at least one tube of the first passage. 
     
     
         3 . Steam generator according to  claim 1 , wherein a pressure-resistant casing consists of steel and/or aluminum and/or a fiber composite material. 
     
     
         4 . Steam generator according to  claim 1 , wherein a pressure-resistant casing is designed as a tube or is formed from flat or profiled sheets. 
     
     
         5 . Steam generator according to  claim 1 , wherein the first passage is designed with one or more straight tubes. 
     
     
         6 . Steam generator according to  claim 1 , wherein the first passage is designed with one or more coiled tubes. 
     
     
         7 . Steam generator according to  claim 1 , wherein a pressure-resistant casing is designed for an operating pressure of between 2 and 100 bar (a) and an operating temperature of between 60 and 350° C. 
     
     
         8 . Steam generator according to  claim 1 , wherein the heat-insulating coating consists of aluminum oxide (Al 2 O 3 ) and/or zirconium oxide (ZrO 2 ) and/or silicon oxide (SiO 2 ) and/or silicon carbide (SiC). 
     
     
         9 . Steam generator according to  claim 1 , wherein it is suitable for evaporating water and/or for superheating steam.