초록 ▼

A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine.

A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffusion device. A thermal energy recovery chamber is partitioned from the main combustion chamber by an inclined partition wall. A fluidized medium flows into and out of the main combustion chamber and the thermal energy recovery chamber. A free board is provided integrally above the main combustion chamber and the thermal energy recovery chamber so that combustion gas from the main combustion chamber and the thermal energy recovery chamber is mixed in the free board.

대표청구항 ▼

[ What is claimed is:] [37.]37. A pressurized cylindrical internal circulating fluidized-bed boiler for use in a combined cycle electric generating system, comprising:a pressure vessel;a combustor disposed in said pressure vessel;a main fluidized bed combustion chamber having an air diffusion device

[ What is claimed is:] [37.]37. A pressurized cylindrical internal circulating fluidized-bed boiler for use in a combined cycle electric generating system, comprising:a pressure vessel;a combustor disposed in said pressure vessel;a main fluidized bed combustion chamber having an air diffusion device provided at the bottom of said combustor and adapted to inject fluidizing air upwardly under a mass flow that is at least greater at one side than that at another side;a partition wall provided above a portion of said air diffusion device;a thermal energy recovery chamber partitioned from said main combustion chamber by said partition wall;a heat transfer surface means provided in said thermal energy recovery chamber for a passage of a heat receiving fluid therethrough;an air diffuser provided at a lower portion of said thermal energy recovery chamber; anda free board provided above said main combustion chamber and said thermal energy recovery chamber;wherein said thermal energy recovery chamber is communicated at upper and lower portions thereof with said main fluidized bed combustion chamber, a moving bed is formed above a portion of said air diffusion device where the injected mass flow is smaller so that a fluidized medium descends and diffuses within the moving bed, and a circulating fluidized bed is formed above a portion of said air diffusion device where the mass flow of the fluidizing air is greater so that said fluidized medium is intensely fluidized and whirled towards a position above said moving bed and a part of said fluidized medium is introduced into said thermal energy recovery chamber beyond an upper portion of said partition wall, the formation of said moving bed and said circulating fluidized bed is effected by regulation of the amount of air injected upwardly from said air diffusion device in said main combustion chamber and regulation of the fluidizing air injected from said air diffuser in said thermal energy recovery chamber causes the fluidized medium within said thermal energy recovery chamber to descend in a state of a moving bed for circulation to said main combustion chamber, and combustion gas from said main combustion chamber and said thermal energy recovery chamber is mixed in said free board..Iaddend..Iadd.