A reactor system includes plural batch-cyclic reduction/oxidation (redox) reactors. One reactor is operated in fuel mode while another is operated in air mode, and vice-versa. For each reactor in air mode, air is introduced via air-only tuyeres and via fuel-air tuyeres to oxidize oxidation particles. For each reactor in fuel mode, fuel is introduced via the reactor's fuel-air tuyeres and not via its air-only tuyeres. As a result, air is introduced at a higher rate than fuel is introduced so that the oxidation rate can match the reduction rate. Thus, for example, as few as two reactors can be used for continuous power generation without having to shuttle oxidation particles between reactors.

A fluidized fuel gas combustor system for a catalytic dehydrogenation process comprising a vessel having a lower portion and an upper portion; a plurality of air injection diffusers located in the lower portion of the vessel; a plurality of fuel gas injection diffusers located on fuel gas distributors disposed in the vessel and spaced apart from and above a plurality of air injection diffusers, wherein the fuel gas diffusers are placed in a manner to maximize even mass distribution of a fuel gas injected through the fuel gas diffusers in the vessel, wherein each fuel distributor comprises a tube having a plurality of fuel gas injection diffusers, one or more optional grid assemblies disposed in the vessel spaced apart from and above the plurality of air injection diffusers and paced apart from and below the fuel gas distributors to maximize even air mass distribution; and one or more grid assemblies disposed in the vessel spaced above the fuel gas distributors is provided.

A burner process for iron fuel combustion, comprising the steps of: providing an iron fuel suspension medium comprising iron fuel and oxygen in a suspension solid density of between 2 to 15 kg/Nm.sup.3 and more preferably of between 4 to 8 kg/Nm.sup.3; introducing said iron fuel suspension medium into an iron fuel burner arrangement at a velocity of between 5.5 and 55 m/s and more preferably between 20 and 40 m/s; introducing air from air inlet means into said iron fuel burner arrangement, wherein said air from said air inlet means is introduced with an overall angular momentum ratio between said air and said iron fuel suspension medium of between 3 and 12 and more preferably between 3.8 and 8.9; mixing said iron fuel suspension medium by subjecting it with said air such that an overall oxygen-to-fuel equivalence ratio is obtained between 1.0 and 2.5 and more preferably between 1.2 and 1.8 for obtaining a combustible medium in the said burner arrangement; igniting said combustible medium to provide a combusting iron fuel containing medium.

A burner process for iron fuel combustion, comprising the steps of: providing an iron fuel suspension medium comprising iron fuel and oxygen in a suspension solid density of between 2 to 15 kg/Nm.sup.3 and more preferably of between 4 to 8 kg/Nm.sup.3; introducing said iron fuel suspension medium into an iron fuel burner arrangement at a velocity of between 5.5 and 55 m/s and more preferably between 20 and 40 m/s; introducing air from air inlet means into said iron fuel burner arrangement, wherein said air from said air inlet means is introduced with an overall angular momentum ratio between said air and said iron fuel suspension medium of between 3 and 12 and more preferably between 3.8 and 8.9; mixing said iron fuel suspension medium by subjecting it with said air such that an overall oxygen-to-fuel equivalence ratio is obtained between 1.0 and 2.5 and more preferably between 1.2 and 1.8 for obtaining a combustible medium in the said burner arrangement; igniting said combustible medium to provide a combusting iron fuel containing medium.

A circulating fluidized bed (CFB) furnace for heating and/or calcination of a material is disclosed. A process for calcination of a material is further.

A circulating fluidized bed (CFB) furnace for heating and/or calcination of a material is disclosed. A process for calcination of a material is further.