Fluidized bed combustion system having an improved pressure seal

摘要

A fluidized bed combustion system in which a separator receives a mixture of flue gases and entrained particulate material from a fluidized bed in a furnace. A pressure seal valve, in the form of two ducts, connects an outlet of the separator to the furnace for recycling the separated particulate material back to the furnace. A pressure head builds up in one of the ducts and air is introduced to the other duct to dampen pressure fluctuations in the furnace and promote the flow of the particulate material back to the furnace.