Method and Apparatus for Controlling Circulating Mass Flow in a Fluidized Bed Reactor Providing and / or Recirculating a Gas Seal to a Return Duct (Method and Apparatus for Providing a Gas Seal in a Return Duct and / fluidized bed reactor)

摘要

A method and apparatus for providing a gas seal in a CFB reactor provided in a slotted vertical return duct (16) and for controlling the flow of a circulating mass therein. The gas seal 22 is formed by disposing the septum means 22, 24, 26 on two different levels within the confinement zone of the return duct to delay the flow of the circulating mass through the confinement zone. The flow of the circulating mass through the confinement zone is controlled by injecting the fluidizing gas (56, 58, 60) into the confinement zone.