Steag Aktiengesellschaft

Helmut Meyer-Kahrweg

A fluidized bed firing unit, in which a fluidized bed of comparatively inert material is maintained in a container having cooled or insulated walls and a flow-bottom by means of air entering through flow nozzles in the bottom, the fuel being fed to the fluidized bed after the latter has been heated to the ignition temperature of the fuel. The air supplied through the air nozzles in the flow bottom for the purpose of producing the fluidized bed, is forced into at least one component of motion causing the fluidized bed to circulate in a horizontal plane while the fuel is fed in the lower part of the fluidized bed, preferably in the area of approximately 20% of the bed height. The motion component moving the fluidized bed in the circulating motion is preferably produced by off center feeding-in of additional air. It is expedient if at least the air nozzles in the area of the container walls are inclined with respect to vertical in the same direction. If desired, all air nozzles can be inclined with respect to the vertical in the same movement direction and/or the inclined nozzles be arranged in the form of a single or multiple spiral in the flow bottom. The inclined nozzles are preferably chamfered at the output end. With a fluidized bed firing unit of this type with vertical heat exchanger coils arranged in the area of the fluidized bed, the respective regions of the fluidized bed lying between the coils are moved in a circulating motion. The inclined nozzles can also be arranged in the form of a single or multiple spiral in the flow-bottom, while the central region of the spiral can be occupied with only upwardly directed air nozzles.

Fluidized bed firing unit

Apparatus for limiting fuel gas fed to the gas flare unit in a coal pressure gasification unit provided with a gas-steam turbine power plant connected thereto. Safety valves and a pressure orifice minimize atmospheric pollution.

Flare gas limiting apparaus for coal gasification unit

A generating plant is driven by a gas turbine, which is run with combustion gases from gas coming from a carbon pressure reactor and which obtains the combustion air necessary for its operation from a primary compressor driven by the gas turbine by means of a final compressor connected at the outlet side of the primary compressor. The final compressor is driven by an expansion turbine connected between the pressure reactor and the combustion chamber acting to produce the combustion gases. During starting up of such a plant the pressure reactor is operated with extraneous air which is primarily compressed by a starting compressor and further compressed by the final compressor which is powered by a pony motor, the expansion turbine being disconnected until it reaches operating speed.

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Wuppertal, Germany

Helmut Meyer-Kahrweg