Abstract: A fluid bed chamber assembly that is affixed to or incorporated onto the bottom portion of a combustion chamber of a package boiler assembly to increase combustion efficiency of the boiler. The fluid bed chamber assembly comprises a lower region and an upper region. The lower region having a plurality of inlet means for admitting fluidizing gas to the lower region for fluidizing a bed of particles contained therein, heat exchange tubes disposed about the side walls of the lower region, and first and second in-bed heat exchange tubes which are disposed substantially horizontal within the lower region. The upper region comprises at least one secondary air inlet means, at least one tertiary air inlet means, at least one fuel feed inlet means, and at least one recycle inlet means, all of which are disposed within the side wall of the conversion fluid bed chamber assembly.

Abstract: A rotary fluid bed gasifier having a combustor assembly and a stationary feed conduit which is capable of feeding a carbonaceous material and/or limestone from outside of the gasifier and delivering this material to the gasification chamber of the combustor assembly through a rotating wall of the combustor assembly, wherein the stationary conduit is centrally disposed within the combustor assembly such that the rotatable inner assembly of the combustor assembly revolves about the stationary conduit.

Abstract: A rotary fluid bed gasifier which comprises: a rotatable drum having a circumferentially extending wall which is permeable to gases; a means for feeding a fluidizing gas through the wall into the drum; a bed of particles which, at least when the gasifier is in use, is supported on an internal face of the wall and is fluidized by the fluidizing gas; an outlet means for receiving an oil-in-water emulsion from outside the gasifier and delivering the oil-in-water emulsion to the drum; a means for introducing steam into the drum; a de-NO.sub.x boiler having a quench zone and a nitrogen fixing zone; a means for introducing secondary air disposed between the quench zone and the nitrogen fixing zone; and a means for introducing tertiary air disposed between the de-NO.sub.x boiler and a main boiler or furnace.

Abstract: A rotary fluid bed gasifier which comprises: a rotatable drum having a circumferentially extending wall which is permeable to gases; a means for feeding a fluidizing gas through the wall into the drum; a bed of particles which, at least when the gasifier is in use, is supported on an internal face of the wall and is fluidized by the fluidizing gas; an outlet means for receiving a carbonaceous material from outside the gasifier and delivering the carbonaceous material to the drum; a means for introducing steam into the drum; a de-NO.sub.x boiler having a quench zone and a nitrogen fixing zone; a means for introducing secondary air disposed between the quench zone and the nitrogen fixing zone; and a means for introducing tertiary air disposed between the de-NO.sub.x boiler and a main boiler or furnace.

Abstract: A bubbling fluid bed steam generator comprising: a reactor chamber having a lower combustion region and a freeboard region; heat exchange means for the circulation of a coolant disposed substantially throughout the freeboard region and along the walls of the reactor chamber; discharge conduit disposed near the top of the reactor chamber for the discharge of flue gas containing entrained solid particles therein; a particle separator connected to the discharge conduit for separating the solid particles from the discharged flue gas, the solid particles being returned to the lower combustion region of the reactor chamber via a recycle port; means for introducing a carbonaceous material to the lower combustion region of the reactor chamber; primary inlet means for introducing a fluidizing gas disposed at the bottom of the reactor chamber; and secondary inlet means for introducing a fluidizing gas disposed above the recycle port, wherein the improvement is characterized by: the lower combustion region of the reacto

Abstract: A method for treating ash produced by waste coal fluidized bed boilers in which hot ash fines and heated secondary air are introduced into the boiler as the coarse ash is cooled. An ash treatment system for cooperation with a fluidized bed boiler operating on waste fuel having a high ash content receives and classifies hot ash from the boiler, returns ash fines to the boiler, cools coarse ash fines for disposal and burns carbon associated with the ash received from the boiler.

Abstract: In a tube boiler, fuel is burned in a fluidized bed which has a shallower part and a deeper part. The tubes extend only through the shallower part which can be fluidized independently of the deeper part so that the rate of heat transfer from the bed to the tubes can be varied according to demand. Water flows through specially configurated, upwardly oriented tubes by natural convection. There is also a general circulation of particles within the bed.

Abstract: A boiler is adapted for solid-fuel firing by connecting with an existing combustion chamber of the boiler. Apparatus comprising a bed of particles with means for feeding solid fuel and primary air to the bed. Secondary air is fed to the existing combustion chamber of the boiler with heated gases which leave the bed.

Abstract: A gas turbine engine has a rotatable drum within which a bed of articles is supported. A compressor of the engine feeds compressed air into the drum to fluidize the bed. Powdered coal is fed into the drum to burn in the bed and the hot products of combustion pass through cyclones to the power turbine. The drum has a solids outlet through which excess particles are discharged from the bed.