METHOD FOR RECYCLING CARBON DIOXIDE CO2

• US 20120304661A1
• Filed: 01/17/2011
• Published: 12/06/2012
• Est. Priority Date: 02/01/2010
• Status: Active Grant

• Current Assignee: SEE - Solucoes, Energia E Meio Ambiente, Ltda.
• Original Assignee: SEE - Solucoes, Energia E Meio Ambiente, Ltda.
• Inventors: Guyomarc'h, Raymond François
• Granted Patent: US 9,327,986 B2
• Time in Patent Office: Days
• US Class Current: 60/780
• CPC Class Codes: C01B 32/40 Carbon monoxide
• CPC Class Codes: C10J 2300/0916 Biomass
• CPC Class Codes: C10J 2300/092 Wood, cellulose
• CPC Class Codes: C10J 2300/093 Coal
• CPC Class Codes: C10J 2300/0946 Waste, e.g. MSW, tires, glass, tar sand, peat, paper, lignite, oil shale
• CPC Class Codes: C10J 2300/0969 Carbon dioxide
• CPC Class Codes: C10J 2300/1603 with gas treatment gas cleaning C10K1/00
• CPC Class Codes: C10J 3/22 Arrangements or dispositions of valves or flues
• CPC Class Codes: C10J 3/82 Gas withdrawal means

Abstract

The invention refers to a recycling process of a so-called gaseous flow (106) of CO₂ essentially containing molecules of CO₂, said process comprising the following steps:

heating of said gaseous flow of CO₂ at a pyrolysis temperature of the material containing carbon (104);

pyrolysis of a load of a carbon-containing material (104) containing elements of carbon by said gaseous flow, said pyrolysis reducing the molecules of CO₂ by said elements of carbon to produce a first gaseous flow (110) essentially containing molecules of carbon monoxide (CO) at high temperature;

oxidation of said molecules of carbon monoxide (CO) by elements of oxygen (O), said oxidation producing a second gaseous flow (114) essentially containing molecules of CO₂;

reduction of said molecules of CO₂ of said second gaseous flow (114), said reduction supplying a third gaseous flow (120) essentially containing molecules of carbon monoxide (CO).

It also refers to a system to perform such a process.

Claims

1. A process Process, to recycle a so-called gaseous flow (106) of CO₂, essentially comprising molecules of CO₂, characterized by said process comprising the following steps:

heating of said gaseous flow of CO2 at a pyrolysis temperature of the material containing carbon (104);

pyrolysis of a load of a carbon-containing material (104) containing elements of carbon by said gaseous flow, said pyrolysis reducing the molecules of CO₂ by said elements of carbon to produce a first gaseous flow (110) essentially containing molecules of carbon monoxide (CO) at high temperature;

oxidation of said molecules of carbon monoxide (CO) by elements of oxygen (O), said oxidation producing a second gaseous flow 114 essentially containing molecules of CO2;

reduction of said molecules of CO2 of said second gaseous flow (114), said reduction supplying a third gaseous flow (120) essentially containing molecules of carbon monoxide (CO).

2. The process of claim 1, wherein the elements of oxygen oxidizing the molecules of carbon monoxide of the first gaseous flow (110) are supplied by oxygen holding oxides (MeO), being said oxygen holders (MeO) reduced after said oxidation.

3. The process of claim 2, wherein by the reduction of the molecules of CO₂ of the second gaseous flow (114) is performed by reduced oxygen holders (Me) obtained after the oxidation of carbon monoxide (CO) molecules.

4. The process of claim 1, further comprising a starting phase during which the heating of the initial gaseous flow of CO₂ is performed by the combustion of a load of material containing carbon.

5. The process of claim 1, further comprising the recovery of at least a part of the thermal power of the second gaseous flow (114), being at least a part of said thermal power used to heat the initial gaseous flow (106).

6. The process of claim 1, further comprising the recovery of at least a part of the thermal power of the third gaseous flow (120), being at least a part of said thermal power used to heat the initial gaseous flow (106) and/or to pre-heat the material containing carbon (104).

7. The process of claim 1, wherein the pyrolysis temperature is between 800 and 1100°

C.

8. The process of claim 1, further comprising a continuous and counter current introduction of material containing carbon (104) and the initial gaseous flow (106) in a pyrolysis zone (102), respecting the proportion of one mole of carbon (C) for one mole of carbon dioxide (CO₂).

9. The process of claim 1, further comprising a step of milling the load containing carbon before the pyrolysis step.

10. The process of claim 1, further comprising the generation of electric energy or thermal power by combustion of at least a part of the third gaseous flow (120).

11. The process of claim 1, wherein the dry load containing carbon comprises:

plant or animal biomass;

coal;

peat;

lignite;

residues;

worn tyres;

or

any combination of these carbon-containing materials.

12. A system (100) to recycle a so-called gaseous flow (106) essentially containing CO₂, being said system (100) characterized by comprising:

heating means (118/101) for said initial gaseous flow (106) at a pyrolysis temperature of the material containing carbon (104);

a first so-called pyrolysis zone (102), performing the pyrolysis of a load of a carbon-containing material (104) by said gaseous flow (106) at said pyrolysis temperature, said pyrolysis reducing the molecules of CO₂ and producing a first gaseous flow (110) essentially comprising molecules of carbon monoxide (CO);

a second so-called oxidation zone (112), performing the oxidation of said molecules of carbon monoxide, said oxidation producing a second gaseous flow (114) essentially containing molecules of CO₂; and

a third so-called reduction zone (116), performing the reduction of said molecules of CO₂ of said second gaseous flow (114), said reduction supplying a third gaseous flow (120) essentially comprising molecules of carbon monoxide (CO).

13. The system of claim 12, wherein the second zone (112) containing oxygen-bearing oxides (MeO) providing a supply of elements of oxygen to oxidize the molecules of carbon monoxide of the first gaseous flow (110), being said oxygen holders reduced after said oxidation.

14. The system of claim 12, wherein the third zone (116) contains oxygen-holding oxides in reduced state (Me) performing the reduction of the molecules of CO₂ of the second gaseous flow (114).

15. The system of claim 13, further comprising containing means of transportation performing:

the transference from the second zone (112) to the third zone (116) of oxygen-bearing oxides in reduced state (Me) obtained after the oxidation of the molecules of carbon monoxide (CO) from the first gaseous flow (110); and

the transference from the third zone (116) to the second zone (112) of the oxygen-bearing oxides in oxidized state (MeO) obtained after the reduction of the molecules of CO₂ from the second gaseous flow (114).

16. The system of claim 13, wherein the holder of oxygen is based on nickel.

17. The system of claim 12, wherein the heating means of the initial gaseous flow comprises at least one thermal exchanger (118) performing:

a transference of thermal power from the second gaseous flow (114) to the initial gaseous flow (106); and

/or

a transference of thermal power from the third gaseous flow (120) to the initial gaseous flow (106).

18. The system of claim 12, further comprising containing means to mill the load containing carbon.

19. The system of claim 12, further comprising means to put said system in depression.