Menetelmä ja laite lämmön talteenottamiseksi leijupetireaktorissa

摘要

A fluidized bed reactor comprises a vertical auxiliary channel for transferring particulate material from the heat exchange chamber to the furnace and vice versa. The lower part of the auxiliary channel includes nozzles for fluidizing gas and with a flow conduit to connect the auxiliary channel to the furnace. The upper part of the channel includes a flow conduit to connect the channel to the heat exchange chamber. A fluidized bed reactor comprises a furnace having a bed of particulate material and a bottom (24) with nozzles for fluidizing gas and limiting the furnace from the bottom; a heat exchange chamber (40) with heat exchange surfaces (48) for recovering heat from the particulate material; and a discharge channel connected to the lower part of the heat exchange chamber for removing particulate material from the heat exchange chamber to the furnace (16). It comprises a vertical auxiliary channel (62) for transferring particulate material from the heat exchange chamber to the furnace and from the furnace to the heat exchange chamber. The lower part of the auxiliary channel has nozzles (68) for fluidizing gas and with a flow conduit (64) for connecting the auxiliary channel to the furnace. The upper part of the auxiliary channel has a flow conduit (66) for connecting the auxiliary channel to the heat exchange chamber. An independent claim is also included for a method of recovering heat in a fluidized bed reactor by feeding carbonaceous fuel and oxygenous fluidizing gas to a furnace of the reactor; feeding hot bed material particles from the furnace to the upper part of a heat exchange chamber; recovering heat from the hot bed material particles in the heat exchange chamber; discharging cooled bed material particles from the lower part of the heat exchange chamber; discharging hot bed material particles in a first operational state of the fluidized bed reactor as an overflow from the upper part of the heat exchange chamber to the furnace downwards along a vertical auxiliary channel and transferring in a second operational state of the fluidized bed reactor hot bed material particles by fluidizing gas fed to the lower part of the auxiliary channel from the furnace to the heat exchange chamber upwards along the auxiliary channel.