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A fluidized bed reactor arrangement includes a bottom portion and a roof portion. A reaction chamber is defined by at least one side wall extending between the bottom portion and the roof portion. The at least one side wall includes a vertically extending portion having a lower end and a lower porti

A fluidized bed reactor arrangement includes a bottom portion and a roof portion. A reaction chamber is defined by at least one side wall extending between the bottom portion and the roof portion. The at least one side wall includes a vertically extending portion having a lower end and a lower portion, which lower portion is inclined in such a manner that a cross section of the reaction chamber decreases towards the bottom portion. A heat exchange chamber, outside of the reaction chamber, is at the lower portion of the at least one side wall. The lower portion of the at least one side wall forms a partition wall between the heat exchange chamber and the reaction chamber. The heat exchange chamber extends from the partition wall to a rear wall of the heat exchange chamber.

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1. A fluidized bed reactor arrangement comprising: a bottom portion;a roof portion;a reaction chamber defined by at least one side wall extending between the bottom portion and the roof portion, the at least one side wall comprising a vertically extending portion having a lower end and a lower porti

1. A fluidized bed reactor arrangement comprising: a bottom portion;a roof portion;a reaction chamber defined by at least one side wall extending between the bottom portion and the roof portion, the at least one side wall comprising a vertically extending portion having a lower end and a lower portion, which lower portion is inclined in such a manner that a cross section of the reaction chamber decreases towards the bottom portion; anda heat exchange chamber, outside of the reaction chamber, at the lower portion of the at least one side wall, the lower portion of the at least one side wall forming a partition wall between the heat exchange chamber and the reaction chamber, the heat exchange chamber extending from the partition wall to a rear wall of the heat exchange chamber,wherein the rear wall of the heat exchange chamber comprises (i) a lower portion extending to the other side, than the partition wall, of a plane extending via the vertically extending portion of the at least one side wall and (ii) an upper portion, wherein a plane extending via the upper portion of the rear wall joins for a predetermined distance from a connection of the heat exchange chamber and the lower end of the vertically extending portion of the at least one side wall with the plane extending via the vertically extending portion of the at least one side wall. 2. The fluidized bed reactor arrangement in accordance with claim 1, wherein the heat exchange chamber is entirely supported by the reaction chamber. 3. The fluidized bed reactor arrangement in accordance with claim 1, wherein the heat exchange chamber comprises end walls in connection with both edges of the rear wall thereof, which end walls extend from the connection of the heat exchange chamber and the lower end of the vertically extending portion of the at least one side wall to the bottom portion of the heat exchange chamber. 4. The fluidized bed reactor arrangement in accordance with claim 1, wherein the heat exchange chamber is horizontally arranged only to a portion of the distance between the edges of the side walls of the at least one side wall. 5. The fluidized bed reactor arrangement in accordance with claim 1, further comprising a number of heat exchange chambers between the edges of the at least one side wall. 6. The fluidized bed reactor arrangement in accordance with claim 1, wherein the rear wall of the heat exchange chamber is formed of a membrane structure and the at least one side wall of the reactor chamber is formed of a membrane structure. 7. The fluidized bed reactor arrangement in accordance with claim 6, wherein the membrane structure of the rear wall of the heat exchange chamber is connected with a feed water system of the fluidized bed reactor arrangement. 8. The fluidized bed reactor arrangement in accordance with claim 6, wherein the membrane structure of the at least one side wall is connected to an evaporator system of the fluidized bed reactor arrangement. 9. The fluidized bed reactor arrangement in accordance with claim 6, wherein a first group of tubes of the membrane structure of the at least one side wall is arranged to run from the vertically extending portion of the at least one sidewall to the lower portion of the at least one side wall and a second group of tubes of the membrane structure of the at least one side wall is arranged to run from the vertically extending portion of the least one side wall to the rear wall of the heat exchange chamber. 10. The fluidized bed reactor arrangement in accordance with claim 1, wherein the heat exchange chamber has a certain center of gravity, especially, when the heat exchange chamber contains a predetermined amount of solid material. 11. The fluidized bed reactor arrangement in accordance with claim 10, wherein the solid material is distributed in a predetermined manner and the heat exchange chamber is arranged in such a manner that the center of gravity joins with the plane. 12. The fluidized bed reactor arrangement in accordance with claim 1, wherein a length of the predetermined distance is determined such that a ratio of the length to a distance between the end walls of the heat exchange chamber is at least 0.5.