Fluidized bed heat exchanger

Abstract

A fluidized bed boiler has a heat exchanger with a front wall, a rear wall opposite to the front wall, and two side walls, formed as water tube panels. An inlet opening in a first section of an upper portion of the heat exchanger introduces hot particles from the fluidized bed boiler to the heat exchanger. Heat exchange surfaces for recovering heat from the particles and an outlet opening are arranged in a second section of the upper portion for returning cooled particles as an overflow from the heat exchanger back to the boiler. The heat exchanger further includes a partition wall between the first and the second sections of the upper portion of the heat exchanger. The partition wall extends from the front wall to a center section of the heat exchanger, and is formed by bending water tubes from at least one side wall of the heat exchanger.

1 - 12 . (canceled) 
     
     
         13 . A fluidized bed heat exchanger of a fluidized bed boiler, the heat exchanger comprising:
 a front wall water tube panel adjacent to the fluidized bed boiler;   a rear wall water tube panel opposite to the front wall;   two side walls, the two side walls being formed as water tube panels;   an inlet opening arranged in a first section of an upper portion of the heat exchanger for introducing hot particles from the fluidized bed boiler to the heat exchanger;   heat exchange surfaces for recovering heat from the particles and an outlet opening arranged in a second section of the upper portion of the heat exchanger for returning cooled particles as an overflow from the heat exchanger back to the fluidized boiler; and   a partition wall between the first section and the second section of the upper portion of the heat exchanger, wherein the partition wall extends from the front wall to a center section of the heat exchanger, and the partition wall is formed by bending water tubes from at least one side wall of the heat exchanger.   
     
     
         14 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall extends to a portion of the heat exchanger that is approximately at an equal distance from the front wall and from the rear wall. 
     
     
         15 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall extends from the front wall to a portion of the heat exchanger that is spaced apart from the front wall and the rear wall by about 30% to about 70%. 
     
     
         16 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall extends from the front wall to a portion of the heat exchanger that is spaced apart from the front wall and the rear wall by about 40% to about 60%. 
     
     
         17 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall is slanted downwards so as to guide particles introduced into the heat exchanger further away from the furnace. 
     
     
         18 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall is formed by bending water tubes from at least one side wall of the heat exchanger as a first horizontal section extending towards a center section of the partition wall and as a second horizontal section from the center section of the partition wall back to the side wall. 
     
     
         19 . The fluidized bed heat exchanger according to  claim 18 , wherein the partition wall is formed by bending water tubes from each of the two side walls of the heat exchanger as a first horizontal section extending towards a center section of the partition wall and as a second horizontal section from the center section of the partition wall back to the side wall. 
     
     
         20 . The fluidized bed heat exchanger according to  claim 18 , wherein the first horizontal section is directly below the second horizontal section. 
     
     
         21 . The fluidized bed heat exchanger according to  claim 19 , wherein the first horizontal section is directly below the second horizontal section. 
     
     
         22 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall has a lower end approximately at the same vertical level as the lower edge of the outlet opening. 
     
     
         23 . The fluidized bed heat exchanger according to  claim 22 , wherein the partition wall has a lower end at a vertical level that is within 0.2 m from that of the lower edge of the outlet opening. 
     
     
         24 . The fluidized bed heat exchanger according to  claim 22 , wherein the partition wall has a lower end at a vertical level that is within 0.1 m from that of the lower edge of the outlet opening. 
     
     
         25 . The fluidized bed heat exchanger according to  claim 13 , wherein the partition wall has a lower end below the vertical level of the lower edge of the outlet opening. 
     
     
         26 . The fluidized bed heat exchanger according to  claim 13 , wherein the heat exchange surfaces are arranged below the vertical level of the lower edge of the outlet opening. 
     
     
         27 . The fluidized bed heat exchanger according to  claim 13 , further comprising a windbox arranged below the heat exchanger, which windbox is divided into a first section that is mainly not below the partition wall and a second section that is mainly below the partition wall.