Patent ID: 7244400

Claim:
An arrangement in a circulating fluidized bed reactor system, the arrangement comprising: a reaction chamber, having a fluidized bed of solid particles therein, and being defined by a ceiling, a bottom, and walls, which are at least partially formed by water tube panels; means for introducing fluidizing gas into said reaction chamber; at least two discharge openings arranged in the walls of said reaction chamber for removing a particle suspension of exhaust gases and solid particles from said reaction chamber; at least two particle separators connected to said discharge openings, for separating the solid particles from the particle suspension, each of said particle separators having a gas discharge opening in an upper part thereof, for discharge of cleaned exhaust gases, each of the gas discharge openings being connected to a discharge duct; a heat recovery section, to which the cleaned exhaust gases are directed; and a gas plenum, defined by an enclosure comprising a ceiling, a bottom, and walls positioned above and integrated with said reaction chamber, for directing the cleaned exhaust gases discharged from said at least two particle separators to said heat recovery section, said gas plenum being provided with at least two exhaust gas inlet openings arranged in the walls thereof for receiving the cleaned exhaust gases from the discharge ducts of said at least two particle separators and directing the cleaned exhaust gases to said gas plenum, said gas plenum also being connected to a connecting channel downstream of said gas plenum for leading the cleaned exhaust gases from said gas plenum to said heat recovery section, wherein the enclosure of said gas plenum is formed by water tube panels as extensions of the water tube panels of said reaction chamber, and said gas plenum is divided into at least two separate chambers by at least one partition that is formed by at least one water tube panel as an extension of at least one of the water tube panels of said reaction chamber.