Abstract: A fluidized bed combustion system and method in which a recycle heat exchange section is located within an enclosure housing the furnace section of the combustion system. The flue gases and entrained solids from a fluidized bed in the furnace section are separated and the flue gases are passed to a heat recovery section and the separated particulate material to the recycle heat exchange section. The recycle heat exchange section includes a bypass chamber for permitting the separated solids to pass directly from the separator to the furnace section. A heat exchange is provided in the recycle heat exchange section to transfer heat from the separated material in the recycle heat exchange section to a fluid flow circuit for heating the fluid flow circuit and reducing the temperature of the separated material. The separated material of the recycle heat exchange section is then passed back to the furnace section.

Abstract: A reactor in which a bed of particulate material including fuel is formed in one of two sections in a vessel. Air is passed through the bed at a velocity to fluidize said material and promote the combustion of the fuel. The air and the combustion gases mix and entrain a portion of the particulate material, and pass from the one section to the other section. A plurality of spaced parallel water tubes are disposed in the path of the mixture and entrained particulate material as they pass through the other section to separate the entrained particulate material from the mixture.

Abstract: A fluidized bed stream generating system in which a cyclone separator is disposed between the furnace section and heat recovery area of a steam generating system. The walls of the cyclone separator are provided with tubes which receive fluid from the steam drum. The fluid is passed through the walls of the separator to cool same before being passed to the heat recovery area.