passageways in the partition are submerged below the top of the respective fluid beds to preclude admixing or the product gases from the two chambers the solid oil shale or bed material is transported through the chambers by inclining or slanting the fluidizing medium distributor so that the solid bed material when fluidized moves in the direction of the downward slope of the distributor application_number US 36819782 A description with reference to the accompanying drawings the combined fluidized bed combustor and retort of the present invention is generally shown at 10 in fig1 as will be described in detailed below the fluidized bed retort and combustor 10 of the present invention is separated into side by side chambers by a partition having passageways therethrough which allows for the flow of the solid bed material between the chambers but inhibits the admixture of the gaseous products in one chamber with the gaseous products of the other chamber in the operation of the combined retort and combustor 10 a conduit 12 is utilized for feeding crushed raw oil shale into the combustor and retort 10 for the recovery of hydrocarbons and the sensible heat therefrom the oil shale enters the retorting chamber 14 where it is fluidized by a stream of inert gas through conduit 16 and steam through conduit 18 the inert gas may be made up of steam nitrogen carbon dioxide or other recoverable gas and the steam is at a temperature in a range.