Sour gas combustion using in-situ oxygen production and chemical looping combustion
AssigneeSaudi Arabian Oil Company
InventorAli Hoteit
Life of this patent
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Abstract
A chemical looping combustion (CLC) process for sour gas combustion includes a number of reaction zones and is configured to provide in-situ oxygen production and in-situ removal of SO2 from a product gas stream by reacting the SO2 with a calcium-based sorbent at a location within one reaction zone. The CLC process is also configured such that the in-situ oxygen production results from the use of a metal oxide oxygen carrier which is purposely located such that it does not directly contact the sour gas, thereby eliminating the generation of undesirable sulfur-based metal oxides.
Claims20
A process for in-situ oxygen production and sour gas combustion using chemical looping combustion while producing a product stream comprising the steps of:
- reducing a bed of metal oxide oxygen carriers that is disposed on a perforated substrate in a lower portion of a fuel reactor to provide gas-phase oxygen which flows to a riser that is in fluid communication with the fuel reactor;
- delivering sour gas into the riser at a location that is downstream of the bed of metal oxide oxygen carriers such that the sour gas is free of direct contact with the metal oxide oxygen carriers;
- combusting the sour gas under oxy-combustion conditions within the riser to produce the product stream which includes SO2;
- removing the SO2 from the product stream;
- oxidizing the reduced metal oxides with air in an air reactor to produce the metal oxide oxygen carriers;
- and
- delivering the oxidized metal oxide oxygen carriers back to the fuel reactor.
A process for in-situ oxygen production and sour gas combustion using chemical looping combustion while producing a product stream comprising the steps of:
- reducing a bed of metal oxide oxygen carriers that is disposed on a perforated substrate in a lower portion of a fuel reactor to provide gas-phase oxygen which flows to a riser that is in fluid communication with the fuel reactor;
- delivering sour gas into the riser at a location that is downstream of the metal oxide oxygen carriers such that the sour gas is free of direct contact with the metal oxide oxygen carriers;
- combusting the sour gas under oxy-combustion conditions within the riser to produce the product stream which includes SO2;
- removing the SO2 from the product stream, wherein the SO2 is removed from the product stream by reacting the SO2 with a calcium-based sorbent that is introduced into the riser to form CaSO4;
- oxidizing the reduced metal oxide with air in an air reactor to produce the metal oxide oxygen carriers;
- and
- delivering the oxidized metal oxide oxygen carriers back to the fuel reactor.
A process for in-situ oxygen production and in-situ reduction of the emission of sulfur compounds that are produced during sour gas combustion using chemical looping combustion while producing a product stream comprising the steps of:
- reducing a metal oxide oxygen carrier that is disposed within a fuel reactor to provide gas-phase oxygen which flows to a riser that is in fluid communication with the fuel reactor;
- delivering sour gas into the riser at a location that is downstream of the metal oxide oxygen carrier such that the sour gas is free of direct contact with the metal oxide oxygen carrier;
- combusting the sour gas under oxy-combustion conditions within the riser to produce the product stream which includes SO2;
- removing the SO2 from the product stream in-situ within the riser by reacting the SO2 with a calcium-based sorbent that is introduced into the riser and reacts with the SO2 to form CaSO4 which is separated from the product stream;
- oxidizing the reduced metal oxide with air in an air reactor to produce the metal oxide oxygen carrier;
- and
- delivering the oxidized metal oxide oxygen carrier back to the fuel reactor.
Dependencies are inferred from the claim text.