EP1532400B1 - Method and device for combusting a fuel-oxidising agent mixture - Google Patents

Description

Technical area

The present invention relates to a method and a device for burning a fuel-oxidizer mixture in a combustion chamber of a turbo group, in particular a power plant.

State of the art

From the EP 0 849 451 A2 a method is known for operating a gas turbo group, wherein the gas turbo group consists essentially of a compressor, a combustion chamber, a turbine and a generator. In a pre-mixer of the combustion chamber, fuel is mixed with compressed air in the compressor before combustion and then burned in a combustion chamber. Compressed air supplied via a partial air line is mixed with fuel supplied via a partial fuel line and introduced into a reactor having a catalyst coating. In the reactor, the fuel mixture is converted into a synthesis gas comprising hydrogen, carbon monoxide, residual air and residual fuel. This synthesis gas is injected into such zones of the combustion chamber in which they cause a stabilization of the flame. Due to the injection of the highly reactive by the hydrogen shares synthesis gas flames form at the injection sites, where they consume residual oxygen of the lean main combustion. This combustion reaction is comparatively stable and also constitutes an ignition source for the main combustion, so that the flames of this reaction also serve as pilot flames.

From the US 5,569,020 is known a premix burner, in whose head concentrically a lance is arranged. This lance contains in its outlet end a catalyst, which is designed to perform a Volloxidation during operation of the premix burner in a flowing through him pilot fuel-oxidizer mixture. This produces a flow of hot gas which mixes with the colder main fuel-oxidizer mixture of the premix burner thereby achieving stabilization of the combustion of the main fuel-oxidizer mixture. Since a hot gas flow is to be generated with the aid of the lance and the catalyst arranged therein, it can be assumed that the mixture which has completely oxidized in the catalyst is lean.

Modern premix burners operate with a lean fuel-oxidizer mixture and must be operated near the ignition limit of their lean mixture in order to minimize the formation of NO _X , and thus meet the increasingly stringent emissions regulations. Consequently, these burners are very susceptible to instabilities of the combustion process and are also exposed to large pressure fluctuations, which adversely affects the service life of the burner, a downstream combustion chamber and a gas turbine or their blades. Therefore, there is a need to stabilize combustion in a lean burn premix burner.

Presentation of the invention

This is where the invention starts. The present invention, as characterized in the claims, deals with the problem of demonstrating possibilities for stabilization for the combustion of a lean fuel-oxidizer mixture in a combustion chamber of a turbo group.

According to the invention, this problem is solved by the subject matters of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The invention is based on the general idea of only partially oxidizing a rich pilot fuel-oxidizer mixture in a catalyst such that highly reactive hydrogen forms, the partially oxidized hydrogen-containing mixture, together with an additional oxidant stream, into at least one zone which is suitable for stabilizing the combustion of the main fuel-oxidizer mixture. In this procedure, the required for Volloxidation the partially oxidized pilot mixture oxidizer is introduced or injected into the suitable zones for combustion stabilization, whereby the stability of the pilot flames thus generated increases. At the same time, the pilot flames do not draw any or at least significantly less oxidant from the main mixture when they are burned, which also makes the main mixture reaction more stable.

Particularly favorable for the stabilization of the combustion of the main mixture has been found when the hydrogen-containing, partially oxidized pilot mixture and the additional oxidant stream are dimensioned so that forms a lean mixture. In particular, a slightly lean mixture may be desirable, which has only a relatively small excess of oxidizer. The influence on the emission values of the main combustion is then particularly low.

According to a particularly advantageous embodiment, the additionally supplied oxidizer stream, which is also referred to below as the heat exchanger oxidizer stream, can be used for preheating the pilot-fuel-oxidizer mixture and / or for cooling the catalyst. The oxidizer used in a turbo group usually comes from the pressure side of a compressor, so that the oxidizer, usually air, already has a relatively high temperature. By injecting the fuel into a partial stream of the compressor-originating oxidizer, a pilot-fuel-oxidizer mixture is formed whose temperature is below that of the densified oxidizer since the fuel, usually natural gas, has a relatively low temperature during injection. Accordingly, another partial flow of the compressor-derived oxidizer may be used to preheat the pilot fuel-oxidizer mixture be used by a suitable heat coupling is performed. As a result, the ignition limit of the catalytic reaction is achieved even at a relatively short inlet path into the catalyst, which can be achieved at the same time an increased conversion rate in the catalyst. The catalytic reaction now increases the temperature of the catalyst. In order for the desired partial oxidation to take place predominantly in the catalyst, the temperature in the catalyst should not increase too much, since otherwise a full oxidation takes place and / or a homogeneous gas reaction can occur. The heat exchanger oxidizer stream is suitable, in particular for its heat release to the pilot fuel-oxidizer mixture, in a special way for cooling the catalyst. As a result, the desired partial oxidation reaction can be stabilized in the catalyst.

According to a preferred embodiment, the catalyst may have a plurality of channels through which it is possible to pass in parallel, one of which is catalytically active and the other catalytically inactive. The catalytically active channels thereby form a catalytically active path through the catalyst, which is designed so that it allows the desired partial oxidation with the formation of hydrogen as it flows through the rich pilot fuel-oxidizer mixture. The catalytically inactive channels form a catalytically inactive path through the catalyst, which is flowed through in operation by the heat exchanger-oxidizer stream. By a uniform construction of the channels, so by the placement of the channels in a common structure of the catalyst, the channels are heat-transmitting coupled together. This construction thus makes it possible, on the one hand, to preheat the pilot-fuel-oxidizer mixture introduced into the catalytic converter and, on the other hand, to cool the catalytic converter. By a targeted coordination of the catalytically active channels and the catalytically inactive channels, in particular with regard to their number, arrangement and dimensioning, a targeted to a nominal operating state of the device, in particular the turbo group, thermal management for the catalyst can be achieved. This allows a long service life for the catalyst and reproducible combustion reactions in the catalyst and thus in the stabilization zones.

Other important features and advantages of the present invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

Brief description of the drawings

Fig. 1

eine schaltplanartige Prinzipdarstellung einer Turbogruppe, die mit einer erfindungsgemäßen Vorrichtung ausgestattet ist,

Fig. 2

eine schaltplanartige Prinzipdarstellung einer erfindungsgemäßen Vorrichtung,

Fig. 3

eine Prinzipdarstellung im Längsschnitt durch einen Vormischbrenner,

Fig. 4

eine Ansicht wie in Fig. 3, jedoch bei einer anderen Ausführungsform,

Fig. 5

eine auseinander gezogene, perspektivische Darstellung eines Katalysators und eines Verteilerkopfs,

Fig. 6

eine Darstellung wie in Fig. 5, jedoch zusätzlich mit einer Lochplatte,

Fig. 7a bis 7d

stark vereinfachte Ausschnitte aus einem Querschnitt eines Katalysators bei verschiedenen Ausführungsformen.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components. Show, in each case schematically,

Fig. 1

a circuit diagram-like schematic representation of a turbo group, which is equipped with a device according to the invention,

Fig. 2

a circuit diagram-like schematic diagram of a device according to the invention,

Fig. 3

a schematic representation in longitudinal section through a premix burner,

Fig. 4

a view like in Fig. 3 but in another embodiment,

Fig. 5

an exploded, perspective view of a catalyst and a distributor head,

Fig. 6

a representation like in Fig. 5 , but additionally with a perforated plate,

Fig. 7a to 7d

highly simplified sections of a cross-section of a catalyst in various embodiments.

Ways to carry out the invention

Corresponding Fig. 1 For example, a turbo group 1 comprises a turbine 2, which is designed in particular as a gas turbine, and a compressor 3, which is connected to the turbine 2 via a drive shaft 4. Usually, the turbo group 1 is used in a power plant, in which case the turbine 2 additionally drives a generator 5 via the shaft 4.

The turbo group 1 furthermore comprises a combustion system designated as combustion chamber 6, which has at least one combustion chamber 7 and at least one premix burner 8 arranged upstream of this combustion chamber 7. The combustion chamber 6 is connected on the input side to the high-pressure side of the compressor 3 and on the output side to the high-pressure side of the turbine 2. Accordingly, the combustion chamber 6 is supplied via an oxidizer 9 from the compressor 3 with oxidizer, in particular air.

The fuel supply takes place via a corresponding fuel line 10. The hot combustion gases are supplied to the turbine 2 via a hot gas line 11. The combustion chamber 6 is used for combustion of a fuel-oxidizer mixture in the combustion chamber 7; the combustion chamber 6 thus forms a device according to the invention. Therefore, this device will be referred to as 6 below.

In Fig. 2 is a detailed view of the combustion chamber 6 and the device 6 reproduced. Accordingly, by suitable flow guidance, a total oxidizer stream 12 coming from the compressor 3 is introduced at 13 into a main oxidant stream 14 and a minor oxidizer stream 15. At 16, the sub-oxidant stream 15 is split into a pilot oxidizer stream 17 and a heat exchanger-oxidizer stream 18. Similarly, here too, a total fuel stream 19 at 20 becomes a major fuel Stream 21 and a pilot fuel stream 22 split. The splitting of the oxidizer streams can take place, for example, in a plenum of the combustion chamber 6, so that the splitting stations 13 and 16 coincide. In particular at the allocation point 20 the fuel flow may be a suitable valve or the like. Arranged. It is also possible to provide the pilot fuel stream 22 with its own pump and, in particular, to supply the combustion chamber 6 independently of the main fuel stream 21.

As shown in the diagram Fig. 2 As can be seen, the main oxidant stream 14 and the main fuel stream 21 are supplied to the premix burner 8, whereby a main fuel-oxidizer mixture 23 is formed in the premix burner 8. This main fuel-oxidizer mixture 23 is then introduced into the combustion chamber 7, where it burns in a complete oxidation. Suitably, the supply of fuel and oxidizer takes place in the premix burner 8 so that a lean main mixture 23 results.

The device 6 or the combustion chamber 6 is also equipped with a catalyst 24, the catalyst material is selected so that it causes partial oxidation of a supplied fuel-oxidizer mixture in certain boundary conditions, such that hydrogen is formed during this partial oxidation. The catalyst 24 is supplied with a mixture of the pilot oxidant stream 17 and the pilot fuel stream 22. The admixing of the pilot fuel stream 22 to the pilot oxidizer stream 17 takes place in such a way that a rich pilot fuel-oxidizer mixture 17, 22 is formed. The mixture formation can take place - as here - in an inlet region of the catalyst 24; likewise, the pilot fuel-oxidizer mixture 17, 22 may already be formed upstream of the catalytic converter 24. The synthesis gas forming in the catalyst 24 by partial oxidation is hereinafter referred to as partially oxidized pilot fuel-oxidizer mixture, which is introduced into the combustion chamber 7, for example, according to the arrow 25. In addition to hydrogen, further reaction products in the case of a natural gas / air mixture are essentially carbon monoxide and residual air or residual ester gas.

The partially oxidized pilot fuel-oxidizer mixture 25 is then introduced according to the invention together with the heat exchanger-oxidizer stream 18 into the combustion chamber 7. As a result, at the respective discharge point a very stable pilot flame or pilot combustion can be generated. The heat exchanger oxidizer stream 18 and the volumetric flow of the partially oxidized pilot mixture 25 are suitably coordinated so that, when mixed, a lean or at least slightly lean mixture is formed.

In order to be able to stabilize the main combustion in the combustion chamber 7 with the help of the stable pilot flames, the partially oxidized pilot mixture 25 and the heat exchanger oxidizer stream 18 are introduced or injected into one or more zones 26, of which Fig. 2 a symbolically bounded by a dotted line. These zones 26 are chosen to be particularly suitable for stabilizing the main combustion of the main fuel-oxidizer mixture 23 formed in the premix burner 8. Such zones 26 are located mainly in the combustion chamber 7. It is also possible that at least one such zone 26 is in the premix burner 8, so that additionally or alternatively, the partially oxidized pilot mixture 25 together with the heat exchanger-oxidizer stream 18 at a corresponding point in the premix burner 8 are introduced, which, for example, in the embodiments of 3 and 4 is realized. For a stabilization of the main combustion of the main mixture 23 in the combustion chamber 7 suitable zones 26 may be, for example: a central recirculation zone in the combustion chamber 7, an external recirculation or dead water zone and a remote from the combustion chamber 7 portion of the Vorrmischbrenners 8. The said recirculation zones arising when the premix burner 8 passes over a sudden cross-sectional widening in the combustion chamber 7 and thereby a swirling flow of the premix burner 8 at the transition into the combustion chamber 7 bursts, so-called "vortex breakdown".

In the specific embodiment shown here, the catalyst 24 has a catalytically active path 27 and a catalytically inactive path 28, which is coupled to the catalytically active path 27 to transmit heat. While the pilot fuel-oxidizer mixture 17, 22 is introduced into the catalytically active path 27, the catalytically inactive path 28 is traversed by the heat exchanger-oxidizer stream 18. As a result, the heat exchanger-oxidizer stream 18th be used on the one hand for preheating the pilot mixture 17, 22, whose temperature has been lowered by the admixing of the relatively cold pilot fuel stream 22. By preheating the ignition of the catalyst reaction is advantageously shifted toward the inlet end of the catalyst 24. On the other hand, the flow through the catalytically inactive path 28 with the heat exchanger-oxidizer stream 18 causes a cooling of the catalyst 24, so that the catalyst 24 can be operated in a predetermined and for the desired catalytic reaction particularly suitable temperature window. By cooling the catalyst 24, in particular a Volloxidation of the pilot mixture 17, 22 and the formation of a homogeneous gas reaction in the pilot mixture 17, 22 are avoided within the catalyst 24.

It is clear that in the catalytic converter 24 or in its catalytically active path 27, in addition to the partial oxidation, a full oxidation of the pilot mixture 17, 22 can take place. Moreover, at relatively low temperatures and using natural gas as the fuel, endothermic steam reforming may occur in the catalyst 24, thereby improving the production of hydrogen and, for example, carbon monoxide. Furthermore, it is possible to supply steam to the catalyst 24 or the pilot mixture 17, 22.

The means used for the supply of the heat exchanger oxidizer stream 18 thereby form an oxidizer feed device, in which case the catalytically inactive path 28 of the catalyst 24 forms a component of this oxidizer feed device.

According to the 3 and 4 For example, in preferred embodiments, the catalyst 24 may be integrated into the premix burner 8. According to Fig. 3 For example, the catalyst 24 may be installed in a lance 29, which is centrally located on a head 30 of the benner 8 remote from the combustion chamber 7 and protrudes here in the direction of the combustion chamber 7 into the premix burner 8. The reactive, partially oxidized pilot mixture 25 is in this case together with the heat exchanger-oxidizer stream 18 injected at the head 30 in the premix burner 8. In the embodiment according to Fig. 4 the catalyst 24 itself is centrally located in the head 30 of the premix burner 8.

In the following, a specific embodiment of the catalyst 24 is based on Fig. 4 explained, without reference to the in Fig. 4 shown installation situation of the catalyst 24 arrives. The catalyst 24 may have a plurality of channels 31 and 32 which can be flowed through in parallel, of which one are catalytically active channels 31, while the other are catalytically inactive channels 32. The catalytically active channels 31 form the catalytically active path 27 of the catalyst 24, while the catalytically inactive channels 32 form the catalytically inactive path 28 of the catalyst 24. In front of the inlet openings of the individual channels 31, 32, the catalyst 4 here has a distribution chamber 33, which is the distribution point 16 in Fig. 2 equivalent. Accordingly, in the distribution chamber 33, the supplied minor oxidant stream 15 is distributed to the catalytically active channels 31 (pilot oxidant stream 17) and the catalytically inactive channels 32 (heat exchanger oxidizer stream 18). In the embodiment shown here, the admixing of the pilot fuel stream 22 takes place within the catalytically active channels 31, expediently before a catalytic coating of the catalytically active channels 31. For an intensive cooling of the catalytically active channels 31, on the one hand the catalytically active channels 31 and the catalytically inactive channels 32 are alternately arranged one another. On the other hand, the catalytically active channels 31 are heat-transmitting coupled to the catalytically inactive channels 32, which can be realized in particular by common boundary walls.

Corresponding Fig. 5 For example, the individual channels 31, 32 of the catalytic converter 24 can be catalytically active or catalytically inactive, line by line, and alternately arranged one row at a time. Accordingly, change in Fig. 5 Lines 34, which consist of juxtaposed catalytically active channels 31, with lines 35, which consist of juxtaposed catalytically inactive channels 32. This results in an alternating layering of the lines 34, 35 transversely to the main flow direction of the catalyst 24. Um to separate the introduction of the heat exchanger oxidizer stream 18 into the catalytically inactive channels 32 from the supply of the pilot mixture 17, 22 from pilot fuel stream 22 and pilot oxidant stream 17 into the catalytically active channels 31 is the Catalyst 24 upstream of a distributor head 36. This distributor head 36 has an output 38 connected to an input 37 of the catalytic converter 24. Furthermore, the distributor head 36 has an in Fig. 5 The first input 39 is connected to a pilot-fuel-oxidizer-mixture line, not shown, which feeds the pilot mixture 17, 22 to the first input 39. In a corresponding manner, a heat exchanger-oxidizer line (not shown) which forms part of the abovementioned oxidizer feed device is connected to the second input 40, via which the heat exchanger-oxidizer flow 18 is supplied to the second input 40.

The distributor head 36 is made up of a plurality of shafts 41 and 42 which are adjacent to the main throughflow direction of the catalytic converter 24. All shafts 41, 42 are open to the output 38 of the distributor head 36. The first wells 41 associated with the first input 39 are also open to the first input 39 while being closed to the second input 40. In a corresponding manner, the second slots 40 associated with the second input 40 are open towards the second input 40 and closed towards the first input 39. In this case, the dimensioning of the shafts 41, 42 is matched to the dimensioning of the channels 31, 32 of the catalytic converter 40 so that each shaft outlet covers a row 34, 35. Since the first shafts 41 and the second shafts 42 are arranged alternately side by side, this results in the desired distribution of the distributors head 36 supplied flows, namely pilot mixture 17, 22 on the one hand and heat exchanger-oxidizer stream 18 on the other hand, on the individual lines 34, 35 of the catalyst 24th

In the embodiment according to Fig. 6 the distributor head 36 basically has the same structure as in the embodiment according to FIG Fig. 5 , In contrast, however, the catalyst 24, the catalytically active channels 31 and the catalytic inactive channels 32 in Fig. 6 not more line like in Fig. 5 but arranged in a checkerboard pattern. In this case, this checkerboard arrangement is rotated relative to a rectangular cross-section of the catalyst 24 by 45 ° about the main flow direction of the catalyst 24, so that quasi a diagonal checkered arrangement of the channels 31, 32 results. In order to achieve a clear separation between the pilot mixture 17, 22 and the heat exchanger oxidizer stream 18 for the flow through the catalyst 24 in this embodiment, is now between the inlet 37 of the catalyst 24 and the outlet 38 of the distributor head 36th a perforated plate 43 having a plurality of through holes 44 arranged in a predetermined hole pattern 45. This hole pattern 45 is expediently chosen such that each channel 31, 32 only communicates with one of the shafts 41, 42 via a single through hole 44. This means that the holes 44 are open on the one hand only to a single well 41, 42 and on the other hand only to a single channel 31, 32 or to a single channel group of catalytically active channels 31 or catalytically inactive channels 32. In this way, on the one hand, the pilot mixture 17, 22 flowing into the first shafts 41 passes exclusively into catalytically active channels 31, while, on the other hand, the heat exchanger oxidizer stream 18 flows exclusively into catalytically inactive channels 32 via the second shafts 42.

By the special measures of the embodiments according to the FIGS. 5 and 6 It is particularly easy, before the introduction into the catalyst 24 or in its channels 31, 32 in a relatively simple manner, the pilot-fuel-oxidizer mixture 17, 22 produce.

In Fig. 7a is a section through the cross section of the catalyst 24 according to Fig. 6 played. Accordingly, the catalytically active channels 31 and the catalytically inactive channels 32 are arranged so that they alternate in a checkerboard pattern. In the Fig. 7a Registered lines represent the orientations or longitudinal center planes of the respective channels 31, 32 associated shafts 41 and 42 at the exit thereof.

Fig. 7b gives a line by line alternating arrangement of the catalytically active channels 31 and the catalytically inactive channels 32 according to the in Fig. 5 illustrated embodiment of the catalyst 24 again and otherwise corresponds to the representation according to Fig. 7a ,

In Fig. 7c another advantageous arrangement for the catalytically active channels 31 and the catalytically inactive channels 32 is shown. In this variant, the number of catalytically inactive channels 32 and their share of the total cross-sectional area of the catalyst 24 is greater than in the catalytically active channels 31. The supply of the heat exchanger-oxidizer stream 18 and the pilot mixture 17, 22 then takes place via a corresponding Arrangement of the first shafts 41 and second shafts 42 in the distributor head 36th

In the embodiment according to Fig. 7d For example, the catalytically active channels 31 and the catalytically inactive channels 32 are again arranged like a box, the catalytically active channels 31 being grouped together in groups of four. Accordingly, a significantly larger number of catalytically active channels 31, while the proportion of the total area of the catalyst 24 through which can flow in the catalytically active channels 31 is about the same size as in the catalytically inactive channels 32. In this embodiment, then the individual holes 44 of the perforated plate 43 associated with either a single catalytically inactive channel 32 or a group of four catalytically active channels 31. In this embodiment, there is a strong increase in the catalytically active surface and an increase in the flow resistance within the catalytically active path 27, which can improve the total achievable conversion rate within the catalytic reaction.

Incidentally, for further variants and embodiments of such a catalyst arrangement on the WO 03/033985 A1 directed. From the WO 03/033985 A1 go to a method and a device for supplying and discharging two gases to or from a Multi-channel monolith structure. With the aid of a distributor head, a first and a second gas can be supplied to one another separated from the first and second channels of the monolith structure. Within the monolithic structure, the channels are arranged so that each first channel having at least one second channel has a common partition wall through which mass and / or heat exchange between the channels is possible.

LIST OF REFERENCE NUMBERS

1

Turbo group

2

turbine

3

compressor

4

wave

5

generator

6

Device / combustion chamber

7

combustion chamber

8th

premix

9

Oxidatorleitung

10

fuel line

11

Hot gas line

12

Total oxidant stream

13

Aufteilstelle

14

Main oxidant stream

15

Besides oxidizer stream

16

Aufteilstelle

17

Pilot oxidizer flow

18

Heat exchanger-oxidant power

19

Total fuel flow

20

Aufteilstelle

21

Main fuel stream

22

Pilot fuel flow

23

Main fuel-oxidizer mixture

24

catalyst

25

oxidized pilot fuel-oxidizer mixture

26

Zone

27

catalytically active path

28

catalytically inactive path

29

lance

30

Head of 8

31

catalytically active channel

32

catalytically inactive channel

33

distribution chamber

34

Line with catalytically active channels

35

Line with catalytically inactive channels

36

distribution head

37

Entrance from 24

38

Output of 36

39

first entrance of 36

40

second entrance of 36

41

first shaft

42

second shaft

43

perforated plate

44

Through Hole

45

hole pattern

Claims (15)

1. Method for combusting a fuel-oxidising agent mixture in a combustion chamber (7) of a group of turbogenerators (1), in particular of a power plant,

   - wherein a total oxidising agent flow (12) is divided into a main oxidising agent flow (14) and a secondary oxidising agent flow (15),

   - wherein said main oxidising agent flow (14) is leanly mixed with a main fuel flow (21) in a premixing burner (8) and this main fuel-oxidising agent mixture (23) is fully oxidised in the combustion chamber (7),

   - wherein the secondary oxidising agent flow (15) is divided into a pilot oxidising agent flow (17) and a heat transmitter-oxidising agent flow (18),

   - wherein the pilot oxidising agent flow (17) is richly mixed with a pilot fuel flow (22) and the mixture (17, 22) is partially oxidised in a catalyst (24), producing hydrogen,

   - wherein the partially oxidised pilot fuel-oxidising agent mixture (25) and the heat transmitter-oxidising agent flow (18) are together, after the catalyst (24), conducted into at least one zone (26) which is suitable for stabilising the combustion of the main fuel-oxidising agent mixture (23).
2. Method according to claim 1, characterised in that the heat transmitter-oxidising agent flow (18) and the partially oxidised pilot fuel-oxidising agent mixture (25) are leanly or slightly leanly mixed after the catalyst (24).
3. Method according to claim 1 or 2, characterised in that the heat transmitter-oxidising agent flow (18) is used to preheat the pilot fuel-oxidising agent mixture (25) and/or to cool the catalyst (24).
4. Method according to any of claims 1 to 3, characterised in that

   - the catalyst (124) has several through-flow parallel channels (31, 32), of which some (31) are catalytically active and others (32) are catalytically inactive,

   - the pilot fuel-oxidising agent mixture (17, 22) is conducted through the catalytically active channels (31),

   - the heat transmitter-oxidising agent flow (18) is conducted through the catalytically inactive channels (32).
5. Method according to claim 4, characterised in that the catalytically active channels (31) and the catalytically inactive channels (32) are coupled together heat-transmissively.
6. Device (6) with a combustion chamber (7) for combusting a fuel-oxidising agent mixture in a group of turbogenerators (1), in particular of a power plant,

   - with a premix burner (8) in which, in operation of the device (6), a main oxidising agent flow is leanly mixed with a main fuel flow (21) and this main fuel-oxidising agent mixture (23) is fully oxidised,

   - with at least one catalyst (24) which is configured, when a rich pilot fuel-oxidising agent mixture (17, 22) passes through it in operation of the device (6), to perform a partial oxidisation, forming hydrogen,

   - with an oxidising agent supply device (28, 32) which, in operation of the device (6), mixes a heat transmitter-oxidising agent flow (18) into the partially oxidised pilot fuel-oxidising agent mixture (25) downstream of the catalyst (24),

   - wherein the catalyst (24) and the oxidising agent supply device (28, 32) are configured such that, in operation of the device (6), the partially oxidised pilot fuel-oxidising agent mixture (25) and the heat transmitter-oxidising agent flow (18) are conducted jointly into at least one zone (26) which is suitable for stabilising the combustion of the main fuel-oxidising agent mixture (23),

   characterised in that

   - a distributor head (36) is mounted upstream of the catalyst (24) and is connected via a first input (39) to a pilot fuel-oxidising agent mixture line, via a second input (40) to a heat transmitter-oxidising agent line, and via an output (38) to the catalyst (24), and

   - the distributor head (36) comprises a plurality of shafts (41, 42) which are adjacent transversely to the flow direction, all of which are open at the output (38) and optionally at the first input (39) or at the second input (40).
7. Device according to claim 6, characterised in that

   - the catalyst (24) has a through-flow catalytically active path (27) and a through-flow catalytically inactive path (28) parallel thereto,

   - the catalytically active path (27) is configured, when a rich pilot fuel-oxidising agent mixture (17, 22) flows through it, to perform a partial oxidisation, forming hydrogen,

   - the catalytically inactive path (28) is coupled heat-transmissively to the catalytically active path (27) and forms a constituent part of the oxidising agent supply device and, in operation of the device (6), the heat transmitter-oxidising agent flow (18) passes through said path.
8. Device according to claim 7, characterised in that:

   - the catalyst (24) has several through-flow parallel channels (31, 32), of which some (31) are catalytically active and others (32) are catalytically inactive,

   - the catalytically active path (27) of the catalyst (24) is formed by its catalytically active channels (31),

   - the catalytically inactive path (28) of the catalyst (24) is formed by its catalytically inactive channels (32).
9. Device according to claim 8, characterised in that a pilot fuel line is connected to the catalytically active channels (31) such that, in operation of the device (6), it conducts the pilot fuel flow (22) separately into the individual catalytically active channels (31).
10. Device according to claim 7 or 8, characterised in that

    - a pilot oxidising agent line is connected to the catalytically active path (27),

    - a pilot fuel line is connected to the pilot oxidising agent line upstream of the catalyst (24).
11. Device according to any of claims 6 to 10, characterised in that the catalyst (24) is arranged concentrically in a head (30) of the premix burner (8).
12. Device according to any of claims 6 to 10, characterised in that the catalyst (24) is arranged in a lance (29) which is arranged concentrically in a head (30) of the premix burner (8) and protrudes into the premix burner (8).
13. Device according to claims 6 and 8, characterised in that

    - the catalytically active channels (31) and the catalytically inactive channels (32) are distributed so that first rows (34) of catalytically active channels (31) arranged next to each other and second rows (35) of catalytically inactive channels (32) arranged next to each other are arranged alternately, in particular as rows,

    - the first shafts (41) open to the first input (39) adjoin the first rows (34), and the second shafts (42) open to the second input (40) adjoin the second rows (35).
14. Device according to claims 6 or 13, characterised in that a perforated plate (43) is arranged between the distributor head (36) and the catalyst (24), the perforation pattern (45) of which is selected such that each channel (31, 32) communicates with one of the shafts (41, 42) through a single passage hole (44).
15. Device according to claim 14, characterised in that

    - the catalytically active channels (31) and the catalytically inactive channels (32) are arranged alternately in a chequerboard pattern,

    - the perforation pattern (45) of the perforated plate (43) and the arrangement of the channels (31, 32) are matched to each other such that the catalytically active channels (31) communicate via the assigned passage holes (44) with the first shafts (41) which lead to the first input (39) of the distributor head (36), while the catalytically inactive channels (32) communicate via the assigned passage holes (44) with the second shafts (42) which lead to the second input (40) of the distributor head (36).

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