US 7,240,639 B2 · Method of and an apparatus for recovering heat in a fluidized bed reactor

Abstract

A fluidized bed reactor, comprising a furnace, a heat exchange chamber, a substantially vertical discharge channel connected to the lower part of the heat exchange chamber for removing particulate material from the heat exchange chamber to the furnace, and a substantially vertical auxiliary channel 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 said auxiliary channel being provided with nozzles for fluidizing gas and with a flow conduit for connecting said auxiliary channel to the furnace and a flow conduit in the upper part for connecting said auxiliary channel to said heat exchange chamber. The furnace, heat exchange chamber, discharge channel and auxiliary channel preferably form an integrated structure having the discharge channel and the auxiliary channel adjacently arranged between the furnace and the heat exchange chamber.

Claims23

Dependent claims

A fluidized bed reactor (10), comprising:

a furnace (16), having a bed of particulate material and a bottom (24) provided with nozzles (26) for fluidizing gas, said bottom limiting the furnace from the bottom;
a heat exchange chamber (40) provided with heat exchange surfaces (48) for recovering heat from the particulate material;
and
a discharge channel (52) connected to the lower part of the heat exchange chamber for removing particulate material from the heat exchange chamber (40) to the furnace (16);
characterized in that
the fluidized bed reactor (10) comprises a substantially vertical auxiliary channel (62) for transferring particulate material from the heat exchange chamber (40) to the furnace (16) and from the furnace (16) to the heat exchange chamber (40), the lower part of the auxiliary channel (62) being provided with nozzles (68) for fluidizing gas and with a flow conduit (64) for connecting the auxiliary channel to the furnace (16), and the upper part of the auxiliary channel (62) being provided with a flow conduit (66) for connecting the auxiliary channel (62) to the heat exchange chamber (40).

3 more elements

A method of recovering heat in a fluidized bed reactor (10), said method comprising the steps of:

(a) feeding carbonaceous fuel (18) and oxygenous fluidizing gas (20) to a furnace of the reactor;
(b) feeding hot bed material particles from the furnace (16) to the upper part of a heat exchange chamber (40);
(c) recovering heat from the hot bed material particles in the heat exchange chamber (40), whereby cooled bed material particles are produced;
(d) discharging cooled bed material particles from the lower part of the heat exchange chamber (40);
characterized in that the method comprises a step of:
(e) discharging hot bed material particles in a first operational state of the fluidized bed reactor (10) as an overflow from the upper part of the heat exchange chamber to the furnace downwards along a substantially vertical auxiliary channel (62) and transferring in a second operational state of the fluidized bed reactor (10) hot bed material particles by means of fluidizing gas fed to the lower part of the auxiliary channel (62) from the furnace (16) to the heat exchange chamber (40) upwards along the substantially vertical auxiliary channel (62).

3 more elements

Dependencies are inferred from the claim text.

Method of and an apparatus for recovering heat in a fluidized bed reactor

Life of this patent

Method of and an apparatus for recovering heat in a fluidized bed reactor

Life of this patent

Abstract

Claims23