Metal ferrite oxygen carriers for chemical looping combustion of solid fuels
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F23C-013/08
F23C-010/01
F23C-010/04
F23B-030/00
B01J-023/00
C01B-013/02
B01J-021/20
출원번호
US-0032628
(2013-09-20)
등록번호
US-9557053
(2017-01-31)
발명자
/ 주소
Siriwardane, Ranjani V.
Fan, Yueying
출원인 / 주소
U.S. Department of Energy
대리인 / 주소
Harney, Timothy L.
인용정보
피인용 횟수 :
1인용 특허 :
2
초록▼
The disclosure provides a metal ferrite oxygen carrier for the chemical looping combustion of solid carbonaceous fuels, such as coal, coke, coal and biomass char, and the like. The metal ferrite oxygen carrier comprises MFexOy on an inert support, where MFexOy is a chemical composition and M is one
The disclosure provides a metal ferrite oxygen carrier for the chemical looping combustion of solid carbonaceous fuels, such as coal, coke, coal and biomass char, and the like. The metal ferrite oxygen carrier comprises MFexOy on an inert support, where MFexOy is a chemical composition and M is one of Mg, Ca, Sr, Ba, Co, Mn, and combinations thereof. For example, MFexOy may be one of MgFe2O4, CaFe2O4, SrFe2O4, BaFe2O4, CoFe2O4, MnFeO3, and combinations thereof. The MFexOy is supported on an inert support. The inert support disperses the MFexOy oxides to avoid agglomeration and improve performance stability. In an embodiment, the inert support comprises from about 5 wt. % to about 60 wt. % of the metal ferrite oxygen carrier and the MFexOy comprises at least 30 wt. % of the metal ferrite oxygen carrier. The metal ferrite oxygen carriers disclosed display improved reduction rates over Fe2O3, and improved oxidation rates over CuO.
대표청구항▼
1. A method of combusting a solid carbonaceous fuel comprising: delivering a metal ferrite oxygen carrier to a fuel reactor, where the metal ferrite oxygen carrier comprises MFexOy on an inert support, where M comprises;mixing the solid carbonaceous fuel and the metal ferrite oxygen carrier in the f
1. A method of combusting a solid carbonaceous fuel comprising: delivering a metal ferrite oxygen carrier to a fuel reactor, where the metal ferrite oxygen carrier comprises MFexOy on an inert support, where M comprises;mixing the solid carbonaceous fuel and the metal ferrite oxygen carrier in the fuel reactor generating a reduced carrier, where the reduced carrier comprises an M component and an FecOd component where c>0 and d>0, where the M component comprises some portion of the M comprising the MFexOy, where 1.5≦x≦2.5 and 3.5≦y≦4.5, further where the M component comprises Ba and where the FecOd component comprises some portion of the Fe comprising the MFexOy, where the FecOd component is FeOt, where 0≦t≦1.5, further where FeOt comprises Fe and maintaining the fuel reactor at a reducing temperature, where the reducing temperature is sufficient to reduce some portion of the metal ferrite oxygen carrier and oxidize some portion of the solid carbonaceous fuel, thereby combusting the solid carbonaceous fuel. 2. The method of claim 1 where the reducing temperature is from 800° C. to 1200° C. 3. The method of claim 2 where the MFexOy is one of MFeuOv, MFewOz, and combinations thereof, and where 1.5≦u≦2.5, 3.5≦v≦4.5, 1.5≦w≦2.5, and 2.5≦z≦3.5. 4. The method of claim 2 where the inert support comprises from about 5 wt. % to about 60 wt. % of the metal ferrite oxygen carrier and the MFexOy comprises at least 30 wt. % of the metal ferrite oxygen carrier. 5. The method of claim 4 where 1.5≦u≦2.5 and 3.5≦v≦4.5. 6. The method of claim 4 where 1.5≦w≦2.5, and 2.5≦z≦3.5. 7. The method of claim 4 where the inert support comprises alumina. 8. The method of claim 1 further comprising injecting a gasification agent into the fuel reactor. 9. The method of claim 1 further comprising oxidizing the reduced carrier by contacting the reduced carrier and an oxidizing gas at an oxidizing temperature, where the oxidizing gas is comprised of oxygen, and where the oxidizing temperature is sufficient to generate an oxidizing reaction, where the reactants of the oxidizing reaction comprise some portion of the oxygen, some portion of the M component, and some portion of the FecOd component, and where the product of the oxidizing reaction is a re-oxidized carrier, where the re-oxidized carrier comprises MFeaOb on the inert support. 10. The method of claim 9 where the oxidizing temperature is from 800° C. to 1200° C. 11. The method of claim 10 where oxidizing the reduced carrier occurs in an oxidizing reactor, and further comprising: transferring the reduced carrier from the fuel reactor to the oxidizing reactor;supplying the oxidizing gas to the oxidizing reactor, thereby generating the re-oxidized carrier;transferring the re-oxidized carrier from the oxidizing reactor to the fuel reactor, and repeating the delivering step and the contacting step utilizing an additional quantity of the solid carbonaceous fuel as the solid carbonaceous fuel and the re-oxidized carrier as the metal ferrite oxygen carrier. 12. A method of combusting a solid carbonaceous fuel comprising: delivering a metal ferrite oxygen carrier to a fuel reactor, where the metal ferrite oxygen carrier comprises MFexOy on an inert support where the inert support comprises from about 5 wt. % to about 60 wt. % of the metal ferrite oxygen carrier, the MFexOy comprises at least 30 wt. % of the metal ferrite oxygen carrier, and where 0.5≦x≦1.5 and 2.5≦y≦3.5 and where 0.5≦a≦1.5 and 2.5≦b≦3.5, where M is one of Ba or Mn-and combinations thereof, and where the MFexOy is one of MFeuOv, MFewOz, and combinations thereof, where 1.5≦u≦2.5, 3.5≦v≦4.5, 1.5≦w≦2.5, and 2.5≦z≦3.5;mixing the solid carbonaceous fuel and the metal ferrite oxygen carrier in the fuel reactor A and maintaining the fuel reactor at a reducing temperature of from 800° C. to 1200° C. and generating a reduced carrier, where the reduced carrier comprises an M component and a FecOd component, where the M component comprises some portion of the M comprising the MFexOy, and where the FecOd component comprises some portion of the Fe comprising the MFexOy, where c>0 and d≧0, thereby combusting the solid carbonaceous fuel;transferring the reduced carrier from the fuel reactor to an oxidizing reactor;oxidizing the reduced carrier by supplying an oxidizing gas to the oxidizing reactor, where the oxidizing gas is comprised of oxygen, and contacting the reduced carrier and the A oxidizing gas at an oxidizing temperature of from 800° C. to 1200° C. and generating an oxidizing reaction, where the reactants of the oxidizing reaction comprise some portion of the oxygen, some portion of the M component, and some portion of the FecOd component, and where the product of the oxidizing reaction is a re-oxidized carrier, where the re-oxidized carrier comprises MFeaOb on the inert support; andtransporting the re-oxidized carrier from the oxidizing reactor to the fuel reactor; and repeating the delivering step, the contacting step, the transferring step, and the oxidizing step utilizing an additional quantity of the solid carbonaceous fuel as the solid carbonaceous fuel and the re-oxidized carrier as the metal ferrite oxygen carrier. 13. A method of combusting a solid carbonaceous fuel comprising: delivering a metal ferrite oxygen carrier to a fuel reactor, where the metal ferrite oxygen carrier comprises MFexOy on an inert support, where M is Mn;mixing the solid carbonaceous fuel and the metal ferrite oxygen carrier in the fuel reactor generates a reduced carrier, where the reduced carrier comprises an M component and an FecOd component, where the M component comprises some portion of the M comprising the MFexOy, and where the FecOd component comprises some portion of the Fe comprising the MFexOy, where c>0 and d≧0;oxidizing the reduced carrier by contacting the reduced carrier and an oxidizing gas at an oxidizing temperature, where the oxidizing gas is comprised of oxygen, and where the oxidizing A temperature is from 800° C. to 1200° C., sufficient to generate an oxidizing reaction, where the reactants of the oxidizing reaction comprise some portion of the oxygen, some portion of the M component, and some portion of the FecOd component, and where the product of the oxidizing reaction is a re-oxidized carrier, where the re-oxidized carrier comprises MFeaOb on the inert support, where 0.5≦x≦1.5 and 2.5≦y≦3.5 and where 0.5≦a≦1.5 and 2.5≦b≦3.5; andmaintaining the fuel reactor at a reducing temperature, where the reducing temperature is sufficient to reduce some portion of the metal ferrite oxygen carrier and oxidize some portion of the solid carbonaceous fuel, thereby combusting the solid carbonaceous fuel. 14. The method of claim 13 where oxidizing the reduced carrier occurs in an oxidizing reactor, and further comprising: transferring the reduced carrier from the fuel reactor to the oxidizing reactor;supplying the oxidizing gas to the oxidizing reactor, thereby generating the re-oxidized carrier;transferring the re-oxidized carrier from the oxidizing reactor to the fuel reactor; and repeating the delivering step and the contacting step utilizing an additional quantity of the solid carbonaceous fuel as the solid carbonaceous fuel and the re-oxidized carrier as the metal ferrite oxygen carrier.
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이 특허에 인용된 특허 (2)
Weimer, Alan W.; Perkins, Christopher; Scheffe, Jonathan; George, Steven M.; Lichty, Paul, Metal ferrite spinel energy storage devices and methods for making and using same.
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