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A fluidized bed combustion system and method in which a recycle heat exchanger is located adjacent the furnace section of the combustion system. A mixture of flue gases and entrained particulate materials from a fluidized bed in the furnace section are separated and the flue gases are passed to a he

A fluidized bed combustion system and method in which a recycle heat exchanger is located adjacent the furnace section of the combustion system. A mixture of flue gases and entrained particulate materials 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 fluidized bed in the recycle heat exchanger. A first chamber and plurality of additional chambers are formed in the recycle heat exchanger. A particulate material is supported in all of the additional chambers and air is introduced to each of the additional chambers to fluidize the material. The separated particulate material from the fluidized bed in the furnace section is introduced into one of the chambers and the chambers communicate to permit the material to flow between the chambers. Upon exceeding a predetermined height, the material flows from the other additional chambers to the first chamber before discharging to the fluidized bed in the furnace section.

대표청구항 ▼

A fluidized bed combustion system comprising means defining a furnace section; means forming a fluidized bed in said furnace section; separating means for receiving a mixture of flue gases and entrained particulate material from said fluidized bed in said furnace section and separating said entraine

A fluidized bed combustion system comprising means defining a furnace section; means forming a fluidized bed in said furnace section; separating means for receiving a mixture of flue gases and entrained particulate material from said fluidized bed in said furnace section and separating said entrained particulate material from said flue gases; means defining a heat recovery section in communication with said separating means for receiving said separated flue gases; and a recycle heat exchanger disposed adjacent said furnace section and comprising a housing, means in said housing for dividing said housing into an inlet chamber, an outlet chamber extending adjacent said inlet chamber, and two additional chambers extending along the sides of said inlet chamber and said outlet chamber, heat exchange means disposed in at least one of said two additional chamber, means for passing said separated particulate material from said separating section to said inlet chamber, means for permitting said separated particulate material to flow from said inlet chamber to said at least one additional chamber, means for directing said separated particulate material in said at least one additional chamber across said heat exchange means for cooling said separated particulate material in said at least one additional chamber, means for permitting said cooled separated particulate material to flow from said at least one additional chamber to said outlet chamber, and means connecting said outlet chamber to said furnace section to permit the recycle of said cooled separated particulate material from said outlet chamber to said fluidized bed in said furnace section.