Abstract: A power plant with efficient emission control and high turbine inlet temperatures is disclosed. The power plant includes a combustor for the combustion of carbonaceous sulfur-bearing fuel. The combustion of this fuel produces a hot gas with SO.sub.x and NO.sub.x contaminants. This gas is conveyed to a refractory heat exchanger where some of the heat from the gas is transferred to a pressurized air stream. The gas is then conveyed to a fluidized bed reactor. The fluidized bed reactor includes a central chamber with a fluidized bed positioned at the base of the chamber. Heat exchangers are positioned within the fluidized bed. These heat exchangers preheat the pressurized air stream which is then conveyed to the refractory heat exchanger and later conveyed to a turbine assembly. The fluidized bed reactor also includes circulating particulate matter, such as CaO. Ammonia may also be injected into the fluidized bed reactor. When operating at a temperature of at least 1,500.degree. F.

Abstract: An emission control fluidized bed reactor is disclosed. The reactor includes a central chamber with a fluidized bed at the base of the central chamber and circulating particulate matter above the fluidized bed forming a freeboard. The fluidized bed is maintained at a temperature range between 1500.degree. F. and 1600.degree. F. The freeboard is operated in a predetermined environment between 1600.degree. F. and 1700.degree. F. and with a velocity between 4 to 12 feet per second. An externally fed gas from a discrete industrial process such as an external combustion system or a plant process is conveyed into the freeboard. The externally fed gas includes pollutants which are suppressed as a result of the predetermined environment in the freeboard.

Abstract: A foreign object removal system is disclosed including a removal chamber projecting laterally from the combustion chamber of a fluid bed reactor and connected via a downwardly directed pipe to a material flow control plenum chamber which includes means for fluidizing the mixture of inert fluid bed particles and foreign objects at the bottom of the pipe for lateral movement into an air classifier wherein the foreign objects are dropped to a collection tank and the fluid bed particles are carried upwardly by a stream of classifying air to a deentrainment chamber where their velocity is reduced and they are returned to the combustion chamber.

Abstract: A fluid bed combustion method and apparatus are disclosed utilizing an induced draft fan downstream of the exhaust port of the combustion chamber. Fluidizing air is given a velocity vector toward one side of the chamber for moving foreign objects to that side where the objects are removed and separated by air classification from bed particles which are returned to the fluid bed. Air classification is accomplished using a blower which is valved off during preheat operation to draw hot air from above the fluid bed down through the particle bed.

Abstract: Apparatus for separating finely divided solids from gas is described comprising a generally cylindrical vessel having a gas inlet opening and a gas outlet opening, a solids inlet opening at the top of the vessel and a solids outlet opening at the bottom of the vessel. First generally cylindrical wall member having a diameter less than that of the vessel is disposed in the vessel to provide an elongated annular space lying between it and the vessel wall. The first cylindrical wall member is in sealing engagement with the top portion of the vessel. A second generally cylindrical wall member having a diameter less than the first wall member is disposed inside the first wall member to provide an elongated annular space between the two wall members which space is filled with a solid particulate contact material and which moves by gravity flow downwardly through the annular space.

Abstract: Finely divided solids are removed from a feed gas by passing the gas through an elongated annular mass of solid particulate contact material held between two generally concentric cylindrical walls. The outer wall is louvered having vanes outwardly inclined to the vertical at 15.degree. to 80.degree. and the louver openings are of such width that most of the particles of contact material are capable of passing through them. The inner wall is perforated to permit passage of gas through the wall and may be louvered similarly to the outer wall but having the louver vanes inwardly inclined. The finely divided solids are entrained or trapped in the mass of contact material which is moved downwardly through and out of the annular space between the two concentric cylindrical walls. The contact material is then treated to separate entrained finely divided solids and returned to the upper end of the annular space.