Hybrid burner and associated operating method

1. A method for operating a hybrid burner for a combustor, in particular of a power plant,

the hybrid burner containing, in a housing, a full oxidation catalyst and a partial oxidation catalyst coupled so as to provide heat exchange between them and, through which medium can flow in parallel,

the partial oxidation catalyst being supplied with a first fuel-oxidizer mixture, which has a first fuel-oxidizer ratio,

the full oxidation catalyst being supplied with a second fuel-oxidizer mixture, which has a second fuel-oxidizer ratio which is different than the first fuel-oxidizer ratio.

2. The method as claimed in claim 1 , wherein

the first fuel-oxidizer ratio is less than 1, so that a rich first fuel-oxidizer mixture is present,

in that the second fuel-oxidizer ratio is greater than 1, so that a lean second fuel-oxidizer mixture is present.

3. The method as claimed in claim 1 , wherein the partial oxidation catalyst is designed in such a way that the partial oxidation catalyst generates a hydrogen-containing first flue gas.

4. The method as claimed in one of claims 1 , wherein

a first flue gas, generated by the partial oxidation catalyst, is at least partially introduced into a central recirculation zone, which is formed in a combustion chamber of the combustor downstream of the hybrid burner, and/or

in that a first flue gas, generated by the partial oxidation catalyst, is at least partially introduced into a lateral recirculation zone, which is formed in the combustion chamber in the region of a sudden cross-sectional widening between hybrid burner and combustion chamber.

5. The method as claimed in claim 1 , wherein a first flue gas, generated by the partial oxidation catalyst, is at least partially mixed with a second flue gas, generated by the full oxidation catalyst, before the flue-gas mixture formed in this way is introduced into a combustion chamber of the combustor.

6. The method as claimed in claim 1 , wherein, during a starting procedure for starting the hybrid burner, the proportions of fuel in volumetric flows of the fuel-oxidizer mixtures are varied respectively via a first fuel supply control and a second fuel supply control, in such a manner that over the course of the starting procedure the proportion of fuel in a volumetric flow of the first fuel-oxidizer mixture decreases, whereas the proportion of fuel in a volumetric flow of the second fuel-oxidizer mixture increases.

7. The method as claimed in claim 6 , wherein during the starting procedure the proportions of fuel in the volumetric flows of the fuel-oxidizer mixtures are varied as a function of an inlet temperature of the hybrid burner.

8. A hybrid burner for a combustor, in particular of a power plant, having a housing, in which a full oxidation catalyst and a partial oxidation catalyst are coupled so as to provide heat exchange between them and arranged such that a medium can flow through them in parallel, and which, in an installed state, the partial oxidation catalyst is connected on an inlet side to at least one oxidizer supply and to a first fuel supply and the full oxidation catalyst is connected on the inlet side to the at least one oxidizer supply and a second fuel supply different from the first fuel supply and the partial oxidation catalyst and the full oxidation catalyst are connected on an outlet side to a combustor.

9. The method as claimed in claim 1 , wherein

the first fuel-oxidizer ratio is less than 1, so that a rich first fuel-oxidizer mixture is present,

in that the second fuel-oxidizer ratio is greater than 2, so that a lean second fuel-oxidizer mixture is present.

10. The method as claimed in claim 1 , wherein

the first fuel-oxidizer ratio is less than ½, so that a rich first fuel-oxidizer mixture is present,

in that the second fuel-oxidizer ratio is greater than 1 so that a lean second fuel-oxidizer mixture is present.

11. The method as claimed in claim 1 , wherein

the first fuel-oxidizer ratio is less than ½, so that a rich first fuel-oxidizer mixture is present,

in that the second fuel-oxidizer ratio is greater than 2, so that a lean second fuel-oxidizer mixture is present.

12. The hybrid burner as claimed in claim 8 , further comprising:

a first fuel supply flow control to vary a volumetric flow ratio of a fuel-oxidizer mixture supplied to the full oxidation catalyst; and

a second fuel supply flow control to vary a volumetric flow ratio of a fuel-oxidizer mixture supplied to the partial oxidation catalyst.

13. The hybrid burner as claimed in claim 1 , wherein a flue gas path is designed in such a way downstream of the partial oxidation catalyst that, when the hybrid burner is operating, it introduces flue gas from the partial oxidation catalyst into a central recirculation zone, which is formed in a combustion chamber of the combustor downstream of the hybrid burner, and/or into a lateral recirculation zone, which is formed in the combustion chamber in the region of a sudden cross-sectional widening between hybrid burner and combustion chamber.

14. The hybrid burner as claimed in claim 8 , wherein the partial oxidation catalyst is designed in such a way that when the hybrid burner is operating, the partial oxidation catalyst introduces a flue gas, which emerges at an exit end of the partial oxidation catalyst, into a central recirculation zone, which is formed in a combustion chamber of the combustor downstream of the hybrid burner.

15. The hybrid burner as claimed in claim 8 , wherein the partial oxidation catalyst is a central lance, with an exit end of the lance positioned in the housing downstream of an exit end of the full oxidation catalyst.

16. The hybrid burner as claimed in claim 8 , wherein the full oxidation catalyst surrounds the partial oxidation catalyst concentrically.

17. The hybrid burner as claimed in claim 8 , wherein the partial oxidation catalyst surrounds the full oxidation catalyst concentrically.

18. The hybrid burner as claimed in claim 8 , wherein the partial oxidation catalyst is designed in such a way that when the hybrid burner is operating, the partial oxidation catalyst generates a hydrogen-containing flue gas when the partial oxidation catalyst is supplied with a rich fuel-oxidizer mixture.

19. The hybrid burner as claimed in claim 8 , wherein the partial oxidation catalyst is designed in such a way that, at least during a starting procedure of the hybrid burner, it releases heat to the full oxidation catalyst.

20. The hybrid burner as claimed in claim 8 , wherein the hybrid burner, in an installed state, forms a flue gas path which leads from exit ends of the catalysts, via a sudden cross-sectional widening into a combustion chamber of the combustor.

21. The hybrid burner as claimed in claim 8 , wherein at least one swirl generator is arranged in the housing, which swirl generator is arranged downstream of the partial oxidation catalyst and/or the full oxidation catalyst or is integrated in the partial oxidation catalyst and/or in the full oxidation catalyst.

22. The hybrid burner as claimed in claim 8 , wherein

the first fuel supply introduces fuel upstream of the partial oxidation catalyst into an oxidizer flow fed to the hybrid burner,

and the first fuel supply is configured in such a way that preheated fuel is fed to the partial oxidation catalyst.

23. The hybrid burner as claimed in claim 22 , wherein the first fuel supply introduces the fuel into the oxidizer flow so far upstream of the partial oxidation catalyst that the fuel is heated through heat exchange with the oxidizer until the partial oxidation catalyst is reached.

24. The hybrid burner as claimed in claim 22 , wherein the first fuel supply includes a heat exchanger which is arranged in the oxidizer flow and includes a fuel path and an oxidizer path, which are coupled to one another in such a manner as to exchange heat.

25. The hybrid burner as claimed in claim 8 , wherein at least one of the catalysts has catalytically active passages and catalytically inactive passages, which are coupled to one another in such a manner as to exchange heat and, when the hybrid burner is operating, have a fuel-oxidizer mixture, which has been fed to a respective catalyst, flowing through them.