Method and apparatus for separating particles from hot gases

A centrifugal separator assembly (40) for separating solid particles from gas exhausted from a reaction chamber (20) of a fluidized bed reactor (10), the separator assembly comprising:

• a vortex chamber (70, 70′, 70″) which is in horizontal direction defined by vertically-extending outer walls (60, 66, 68, 86, 88) formed of planar water tube panels, the walls forming multiple corners, the inside of the walls being at least partly provided with a refractory lining and defining a gas space in the vortex chamber, where at least one vertical gas vortex (84, 84′) is established;
• at least one inlet (32, 82, 82′) for introducing gas and solid particles into the gas space from the reaction chamber;
• at least one outlet (48) for discharging purified gas from the gas space;
• and
• at least one outlet (44) for discharging separated solid particles from the gas space through a return duct to the reaction chamber;
• characterized in that in at least one of said corners the angle between the panels is at least 108 degrees, and the corner is rounded by a refractory lining (64) on the inside of the outer walls.