Back to results
US 2007/0175411 A1Published application
Oxygen-producing oxycombustion boiler
AssigneeALSTOM Technology Ltd
InventorsJean-Xavier Morin, Corinne Beal, Silvestre Suraniti
Life of this patent
Estimating the term…
Abstract
The boiler of the invention has a circulating fluidized bed, uses solid fuels and the oxygen obtained by high temperature oxygen production membranes, and is characterized in that the membranes are placed in the bed. These membranes are, for example, of the OTM (Oxygen Transport Membranes) type. Since the membranes operate at over 700° C., their positioning in the outer bed is ideally selected because the temperature of the solids circulating in the outer bed is between 750 and 900° C. This is particularly remarkable because the operating temperature windows of the circulating fluidized bed coincide with the optimal temperature window of use of the membranes.
Claims28
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
(canceled)
A circulating fluidized bed boiler comprising:
- a firebox in which solid fuel is combusted in the presence of oxygen to generate flue gases containing solids;
- a separator connected in fluid flow relation with the firebox for receiving the flue gases containing solids from the firebox and for separating the solids contained therein from the flue gases;
- a solids recirculation loop connected in fluid flow relation with the separator for receiving from the separator the solids that are separated from the flue gases in the separator;
- a solids extraction loop connected in fluid flow relation with the solids recirculation loop for receiving from the solids recirculation loop at least a portion of the separated solids that are received by the solids recirculation loop from the separator;
- a fluidized bed containing fluidized solids connected both in fluid flow relation with the solids extraction loop for receiving from the solids extraction loop the portion of the separated solids that are received by the solids extraction loop from the solids recirculation loop and in fluid flow relation with the firebox for recycling to the firebox the portion of the separated solids that are received by the fluidized bed from the solids extraction loop;
- high temperature oxygen production membranes supported in the fluidized bed so as to be exposed to the heat from the portion of the separated solids that are received by the fluidized bed in order to thereby maintain the high temperature oxygen production membranes within a desired temperature range for purposes of extracting oxygen from air;
- pressurized air supplied to the fluidized bed so as to enable the high temperature oxygen production membranes in the fluidized bed to extract oxygen from the pressurized air;
- and
- an oxygen loop connected in fluid flow relation with the fluidized bed and with the firebox for supplying the oxygen extracted from the pressurized air in the fluidized bed to be employed for purposes of effecting in the presence thereof the combustion of the solid fuel in the firebox.
6 more elements
A circulating fluidized bed boiler comprising:
- a firebox in which solid fuel is combusted in the presence of oxygen to generate flue gases containing solids;
- a separator connected in fluid flow relation with the firebox for receiving the flue gases containing solids from the firebox and for separating the solids contained therein from the flue gases;
- a solids recirculation loop connected in fluid flow relation with the separator for receiving from the separator the solids that are separated from the flue gases in the separator;
- a solids extraction loop connected in fluid flow relation with the solids recirculation loop for receiving from the solids recirculation loop at least a portion of the separated solids that are received by the solids recirculation loop from the separator;
- high temperature oxygen production membranes supported on the lower periphery of the firebox so as to be exposed to sufficient heat to thereby maintain the high temperature oxygen production membranes within a desired temperature range for extraction of oxygen from air;
- air supplied to the high temperature oxygen production membranes for purposes of effecting the extraction by the high temperature oxygen production membranes of oxygen from the air;
- and
- an oxygen loop for supplying the oxygen extracted from the air by the high temperature oxygen production membranes to the firebox to be employed for purposes of effecting in the presence thereof the combustion of the solid fuel in the firebox.
5 more elements
A circulating fluidized bed boiler comprising:
- a firebox in which solid fuel is combusted in the presence of oxygen to generate flue gases containing solids;
- a separator connected in fluid flow relation with the firebox for receiving the flue gases containing solids from the firebox and for separating the solids contained therein from the flue gases;
- a solids recirculation loop connected in fluid flow relation with the separator for receiving from the separator the solids that are separated from the flue gases in the separator;
- a solids extraction loop connected in fluid flow relation with the solids recirculation loop for receiving from the solids recirculation loop at least a portion of the separated solids that are received by the solids recirculation loop from the separator;
- high temperature oxygen production membranes supported as an assembly resting on the hearth of the firebox so as to be exposed to sufficient heat to thereby maintain the high temperature oxygen production membranes within a desired temperature range for extraction of oxygen from air;
- air supplied to the high temperature oxygen production membranes for purposes of effecting the extraction by the high temperature oxygen production membranes of oxygen from the air;
- and
- an oxygen loop for supplying the oxygen extracted from the air by the high temperature oxygen production membranes to the firebox to be employed for purposes of effecting in the presence thereof the combustion of the solid fuel in the firebox.
5 more elements
Dependencies are inferred from the claim text.