Abstract: The seal is provided at a joint between two ducts, which are traversed by hot gases. It has a seat for the seal and an elastic compensator strip, which spans the gap between the two ducts. A woven wire cloth is provided under the compensator strip. A metal foil is provided over the woven wire cloth and a packing of ceramic fibers is provided over the metal foil. A seat member for the seal is joined to each of the two ducts. Each seat member is provided with a row of pointed rods of metal, which extend through the woven wire cloth, the metal foil and the packing of ceramic fibers.

Abstract: The combustion chamber for combusting finegrained fuels in a fluidized bed at temperatures from 700.degree. to 1100.degree. C. is provided with a refractory lining in the lower portion of the chamber on the inside surface of the watercooled wall. The lining is provided at its top end with a cornice, which is enlarged in width. The width of the cornice is preferably at least 1.5 times the wall thickness of the brick lining below the cornice.