Boiler having a fluidized bed heat exchanger

Abstract

The invention relates to a fluidized bed heat exchanger. The heat exchanger includes a plurality of tubes forming a tube bundle. Each tube follows a vertical boustrophedon path. The tubes are supported by at least two vertical supporting devices placed on both sides of the tube bundle. Every vertical supporting device includes at least two vertical supports for fixing the tubes.

1 . A boiler comprising a fluidized bed heat exchanger, the heat exchanger including a plurality of tubes forming a tube bundle, each tube following a vertical boustrophedon path, the tubes being supported by at least two vertical supporting devices placed on both sides of the tube bundle, characterized in that every vertical supporting device comprises at least two vertical supports for fixing the tubes. 
     
     
         2 . A boiler according to  claim 1 , wherein the boustrophedon path of each tube comprise horizontal portions, two consecutive horizontal portions being linked together by a vertical portion thus forming a bend between the horizontal portions. 
     
     
         3 . A boiler according to  claim 1 , wherein one supporting device is located on the left side of the tube bundle and in that one supporting device is located on the right side of the tube bundle. 
     
     
         4 . A boiler according to  claim 1 , wherein the vertical supports are vertical tubes. 
     
     
         5 . A boiler according to  claim 4 , wherein the tubes forming the vertical supports are cooled or uncooled. 
     
     
         6 . A boiler according to  claim 2 , wherein for at least one supporting device, each horizontal portion of each tube of the heat exchanger is fixed to only one vertical support of the supporting device. 
     
     
         7 . A boiler according to  claim 6 , wherein for each supporting device, each horizontal portion of each tube of the heat exchanger is fixed to only one vertical support of the supporting device. 
     
     
         8 . A boiler according to  claim 2 , wherein, for at least one supporting device, two consecutive horizontal portions of each tube of the heat exchanger ( 3 A) are not fixed to the same vertical support of the supporting device. 
     
     
         9 . A boiler according  claim 8 , wherein, for each supporting device, two consecutive horizontal portions of each tube of the heat exchanger are not fixed to the same vertical support of the supporting device. 
     
     
         10 . A boiler according to  claim 1 , wherein, for each supporting device, each horizontal portion of tube of the heat exchanger is fixed to only one vertical support of the supporting device and in that, for each supporting device, two consecutive horizontal portions of each tube of the heat exchanger are not fixed to the same vertical support of the supporting device. 
     
     
         11 . A boiler according to  claim 1 , wherein the boiler comprises a furnace in which combustion of solid particles is sustained and in that the fluidized bed heat exchanger is placed outside the furnace.