JP2012207588A - Gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas turbine that can supply exhaust air to a combustor in a turbine casing without directly exposing the inner wall face of the casing to exhaust air at high temperature, while preventing mixing of exhaust air with compressed air in the casing.SOLUTION: A gas turbine (10, 100) includes a casing 18 that stores a combustor 16 in a casing inner space 20 where compressed air passing through a compressor 12 flows in. The casing inner space 20 is segmented by a partition wall (30, 70) covering the combustor 16 into a first space 20A which is in contact with the inner wall face 19 of the casing 18 and allows compressed air from the compressor 12 to flow, and a second space 20B which is in contact with the combustor 16. A sealing member 40 is disposed between the partition wall (30, 70) and the combustor 16. The gas turbine is also provided with: an extraction pipe 50 which extracts compressed air from the first space 20A and guides the air to a heating part outside the casing 18; and a supply pipe (60, 80) which guides exhaust air passing through the heating part to the second space 20B.

Description

  The present invention relates to a gas turbine, and more particularly, to a gas turbine that guides compressed air that has passed through a compressor to a heating unit outside a passenger compartment, and uses exhaust air from the heating unit as combustion air.

  In recent years, as a solution to problems such as global warming and fossil fuel depletion, a combined power generation system in which a fuel cell that has high power generation efficiency and does not emit carbon dioxide is combined with a gas turbine has attracted attention.

  For example, Patent Document 1 discloses a combined power generation system in which a gas turbine and a solid oxide fuel cell (SOFC) are combined. In this combined power generation system, compressed air from a compressor of a gas turbine is supplied to an air electrode of a solid oxide fuel cell, and exhaust air and exhaust fuel gas from the solid oxide fuel cell are supplied to a combustor of the gas turbine. Then, the combustion gas generated is supplied to the turbine to obtain rotational power.

  Patent Document 2 discloses a combustor for a gas turbine that constitutes a combined power generation system together with a fuel cell. This combustor has a configuration in which a burner and a combustion liner are housed in a casing. The casing of the combustor is divided by a partition wall into a space near the burner and a space downstream of the burner. In the space near the burner, a mixture of compressed air supplied from the compressor through the combustion air supply line and a part of the exhaust gas supplied from the fuel cell through the exhaust gas line is supplied. . On the other hand, the remainder of the exhaust gas from the fuel cell is supplied to the space downstream of the burner. In this way, a part of the exhaust gas of the fuel cell is mixed with the compressed air and supplied to the vicinity of the burner, and the remaining part of the exhaust gas of the fuel cell is supplied as dilution air downstream from the burner, so that the fuel having a low oxygen concentration The instability of the combustion state due to the supply of the exhaust gas of the battery to the combustor can be suppressed.

JP 2009-205932 A JP 2002-106844 A

  By the way, some gas turbines are designed to save space by housing a combustor in a passenger compartment. When trying to construct a combined power generation system with a fuel cell using this type of gas turbine, when supplying high temperature and low oxygen concentration exhaust air that has passed through the air electrode of the fuel cell to the combustor in the passenger compartment, the following: Face such demands.

That is, the exhaust air from the fuel cell is very high temperature (for example, 500 to 600 ° C.) and may exceed the heat resistance temperature of the passenger compartment, so that when the exhaust air is supplied to the combustor, Measures not to touch directly are required.
The exhaust air from the fuel cell has a lower oxygen concentration than the compressed air that has passed through the compressor, while the compressed air that has passed through the compressor has a lower temperature (for example, around 400 ° C.) than the exhaust air from the fuel cell. is there. For this reason, if the exhaust air from the fuel cell and the compressed air that has passed through the compressor are mixed in the passenger compartment, the oxygen concentration of the compressed air flowing into the air electrode of the fuel cell decreases, and the power generation efficiency of the fuel cell As a result, the temperature of exhaust air from the fuel cell led to the combustor decreases and the power generation efficiency of the combined power generation system as a whole decreases. Therefore, when supplying the exhaust air to the combustor, a measure is required from the above viewpoint to prevent the exhaust air and the compressed air that has passed through the compressor from being mixed in the vehicle interior.

However, in the combined power generation system of Patent Document 1, the specific device configuration for supplying exhaust air from the fuel cell to the combustor is not clear. Therefore, Patent Document 1 does not present the above-described countermeasures required for a gas turbine in which a combustor is housed in a vehicle compartment.
Moreover, since the combustor of patent document 2 guides the compressed air from a compressor to the combustor side via the combustion air supply line, it is not accommodated in a vehicle interior, but is provided outside the vehicle interior. It is clear that When the combustor is provided outside the vehicle compartment, the vehicle compartment is exposed to the high-temperature exhaust air from the combustor simply by connecting the compressor, fuel cell, and combustor in series in this order. In addition, the compressed air from the compressor and the exhaust air from the combustor cannot be mixed. Therefore, Patent Document 2 does not present the above-described countermeasures required for a gas turbine in which a combustor is housed in a vehicle compartment.

  Also, when the compressed air that has passed through the compressor is reheated by the exhaust gas of the gas turbine and returned to the combustor in the passenger compartment as combustion air, as in the combined power generation system of the fuel cell and the gas turbine. The above measures are necessary. In other words, in consideration of the heat resistance of the passenger compartment, it is necessary to prevent the passenger compartment from being exposed to the combustion air after reheating. It is necessary to devise a way to avoid mixing in the passenger compartment.

  The present invention has been made in view of the above circumstances, and the vehicle interior wall is not directly exposed to high-temperature exhaust air, and the vehicle interior is prevented from being mixed with exhaust air and compressed air. It is an object of the present invention to provide a gas turbine that can supply exhaust air to a combustor.

  A gas turbine according to the present invention heats compressed air that has passed through a compressor by a heating unit outside the passenger compartment, supplies exhaust air and fuel from the heating unit to a combustor, and burns the generated combustion gas. A gas turbine that obtains rotational power by supplying to a turbine, wherein a vehicle compartment that houses the combustor in a vehicle interior space into which compressed air that has passed through the compressor flows, and the vehicle so as to cover the combustor A partition wall provided in an indoor space, and separating the vehicle interior space into a first space in contact with an inner wall surface of the vehicle interior and through which compressed air from the compressor flows, and a second space in contact with the combustor; A seal member provided between the combustor, a compressed air bleed pipe that communicates with the first space, bleeds compressed air from the first space and guides it to the heating unit, and communicates with the second space. The exhaust air that has passed through the heating unit And a discharge air supply pipe leading to second space, wherein the exhaust air introduced into the second space, characterized in that it is used the incorporated to the combustor for combustion of the fuel.

  In this gas turbine, the vehicle interior space is separated by a partition wall covering the combustor into a first space in contact with the vehicle interior wall surface and a second space in contact with the combustor (in other words, the first space in contact with the vehicle interior wall surface defines the partition wall. A sealing member is provided between the combustor and the partition wall. Therefore, the movement of the exhaust air in the second space to the first space in contact with the wall surface of the vehicle interior can be prevented by the partition wall and the seal member, and the vehicle interior wall surface can be prevented from being directly exposed to the high temperature exhaust air. Moreover, since the flow of the fluid between the first space and the second space is hindered by the partition wall and the seal member, mixing of exhaust air and compressed air in the passenger compartment can be prevented.

  Here, the heater may be an air electrode of a fuel cell that constitutes a combined power generation system together with the gas turbine. As described above, in the gas turbine, the vehicle interior wall surface is not directly exposed to high-temperature exhaust air, and mixing of exhaust air and compressed air in the vehicle interior is prevented, so a combined power generation system with a fuel cell Can be realized appropriately.

  In the gas turbine, the seal member may absorb a difference in elongation between the combustor and the partition wall.

  Thereby, the expansion | extension difference between a combustor and a partition can be absorbed and a deformation | transformation, destruction, etc. of each member can be prevented. For example, even if the combustor becomes hotter than the partition due to heat generated by combustion and a difference in thermal elongation occurs between them, deformation or destruction of each member due to thermal stress can be prevented.

The seal member capable of absorbing the difference in elongation as described above may be a spring clip that seals a gap between the partition wall and the combustor by an elastic force. Alternatively, as a sealing member capable of absorbing the difference in thermal elongation, it is made of a viscoelastic material mainly composed of carbon nanotubes, fixed to one of the combustor and the partition, and pressed against the other A seal member may be used. A viscoelastic material mainly composed of carbon nanotubes has excellent heat resistance and can maintain viscoelasticity up to about 1000 ° C., so that it can be sufficiently used even in a harsh environment near a combustor where heat is generated by combustion. .
It should be noted that the sealing member such as a spring clip only needs to be able to inhibit the flow of fluid between the first space and the second space separated by the partition wall, and does not necessarily completely close the gap between the partition wall and the combustor. There is no need to seal.

  Note that a viscoelastic material mainly composed of carbon nanotubes (CNT) is prepared by, for example, depositing an iron catalyst on a silicon substrate by sputtering, preparing the catalyst by reactive ion etching with argon ions, and then superimposing the catalyst on the substrate. It can be produced by compressing a CNT structure obtained by synthesizing CNTs by the growth method. In addition, the viscoelastic material mainly composed of CNT is described in the reference "Ming Xu, Don N. Futaba, Takao Yamada, Motoo Yumura and Kenji Hata," Carbon Nanotubes with Temperature-Invariant Viscoelasticity from -196 ° C to 1000 ° C, " Science, Vol. 330, No. 6009, pp. 1364-1368 (2010), Published online 3 December 2010. DOI: 10.1126 / science.1194865 ”.

Further, in the gas turbine, a plurality of the combustors are provided in the vehicle interior space, the partition walls individually cover the combustors, and the second space surrounded by the partition walls is an abbreviation for housing each combustor. It may be a cylindrical space.
As a result, even in the case of a gas turbine in which a plurality of combustors are housed in the vehicle interior, the vehicle interior wall surface is not directly exposed to high-temperature exhaust air, and mixing of exhaust air and compressed air in the vehicle interior is prevented. it can.

In this case, the exhaust air supply pipe passes through the heating unit interposed between the branch pipes and the heating unit, and a plurality of branch pipes communicating with the second space around each combustor. A manifold for supplying the exhaust air to the branch pipe, and the manifold may be provided around the vehicle compartment.
Thereby, the exhaust air from a heating part can be reliably distributed to each combustor by a manifold and a branch pipe.

Alternatively, in the gas turbine, a plurality of the combustors are provided in the vehicle interior space, the partition walls collectively cover the plurality of combustors, and the second space surrounded by the partition walls is a plurality of the combustions. It may be a substantially annular space for storing the vessel.
As a result, even in the case of a gas turbine in which a plurality of combustors are housed in the vehicle interior, the vehicle interior wall surface is not directly exposed to high-temperature exhaust air, and mixing of exhaust air and compressed air in the vehicle interior is prevented. it can.

In the gas turbine, a rib for reinforcing the partition may be provided.
Since the compressed air flows from the first space into the heating section through the compressed air bleed pipe, and the exhaust air from the heating section flows into the second space through the exhaust air supply pipe, it is located upstream. The compressed air in the first space has a slightly higher pressure than the exhausted air in the second space located on the downstream side. For this reason, the partition is pressed from the first space side to the second space side. Thus, as described above, ribs can be provided to reinforce the partition walls, thereby preventing the partition walls from being deformed.

  According to the present invention, the seal member is provided between the combustor and the partition wall, with the partition wall covering the combustor separating the vehicle interior space into the first space contacting the vehicle interior wall surface and the second space contacting the combustor. Therefore, the movement of the exhaust air in the second space to the first space in contact with the wall surface of the vehicle interior can be prevented by the partition wall and the seal member, and the vehicle interior wall surface can be prevented from being directly exposed to the high temperature exhaust air. Moreover, since the flow of the fluid between the first space and the second space is hindered by the partition wall and the seal member, mixing of exhaust air and compressed air in the passenger compartment can be prevented.

It is a schematic block diagram which shows an example of the combined power generation system which combined the fuel cell and the gas turbine. It is sectional drawing which shows the vehicle interior structure around the combustor of the gas turbine which concerns on 1st Embodiment. It is sectional drawing along the AA line in FIG. It is a figure which shows the structural example of the partition which covers a combustor, (a) is sectional drawing along the longitudinal direction of a combustor, (b) is the top view seen from the B direction of Fig.4 (a). FIG. 3 is an enlarged view of a region indicated by C in FIG. 2. It is a top view of the sealing member shown in FIG. It is sectional drawing which shows the vehicle interior structure around the combustor of the gas turbine which concerns on 2nd Embodiment. It is a figure which shows the partition periphery vicinity of the gas turbine shown in FIG. 7, and is sectional drawing along the direction orthogonal to a combustor longitudinal direction. It is a perspective view which shows the structural example of the partition by which the rib for reinforcement was erected.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only.

[First Embodiment]
FIG. 1 is a schematic configuration diagram illustrating an example of a combined power generation system in which a fuel cell and a gas turbine are combined.
Here, an example in which the compressed air generated by the compressor of the gas turbine is heated by the air electrode of the fuel cell and returned to the gas turbine combustor (that is, when the “heating unit” is the air electrode of the fuel cell). However, the “heating unit” for heating the compressed air outside the gas turbine casing is not limited to the air electrode of the fuel cell. For example, the compressed air that has passed through the compressor may be reheated by heat exchange with the gas turbine exhaust in a reheater as a “heating unit” and returned to the combustor as combustion air.

The combined power generation system 1 includes a fuel cell 2 and a gas turbine 10.
The fuel cell 2 is a fuel cell having a relatively high reaction temperature (so-called high-temperature fuel cell). For example, a solid oxide fuel cell (SOFC) or a molten carbonate fuel cell (MCFC) is used. Can be used. In the fuel cell 2, an electrolyte 8 is provided between the fuel electrode 4 and the air electrode 6. On the other hand, in the gas turbine 10, a compressor 12, a turbine 14, and a combustor 16 that are coaxially connected are provided in a passenger compartment 18.

In the fuel cell 2, fuel gas is supplied to the fuel electrode 4, and compressed air from the compressor 12 of the gas turbine 10 is supplied to the air electrode 6. As a result, ions generated at the air electrode 6 (O ²⁻ in the case of SOFC, CO ₃ ^{2− in} the case of MCFC) move to the fuel electrode 4 via the electrolyte 8, and the ions are generated in the fuel electrode 4. Reacts with hydrogen in the gas to generate electromotive force. The exhaust fuel gas that has passed through the fuel electrode 4 is guided to the combustor 16 of the gas turbine 10, mixed with the separately supplied fuel, and used as fuel for combustion in the combustor 16. The compressed air is heated when passing through the air electrode 6 and is supplied to the combustor 16 in the passenger compartment 18 as combustion air.

  In addition, you may make it guide the compressed air which passed the compressor 12 to the air electrode 6 of the fuel cell 2 after heating beforehand as needed. For example, the compressed air that has passed through the compressor 12 may be heated by heat exchange with the gas turbine exhaust and then supplied to the air electrode 6 of the fuel cell 2.

  FIG. 2 is a view showing a vehicle interior structure around the combustor 16 of the gas turbine 10 in the combined power generation system 1 of FIG. 1. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a view showing a configuration example of a partition wall covering the combustor 16, FIG. 4 (a) is a cross-sectional view along the longitudinal direction of the combustor 16, and FIG. It is the top view seen from the direction. FIG. 5 is an enlarged view of a region indicated by C in FIG. FIG. 6 is a plan view showing a part of the seal member of FIG.

  As shown in FIG. 2, the vehicle interior 18 includes a first casing 18 </ b> A on the compressor 12 side and a second casing 18 </ b> B on the turbine 14 side, and surrounds a substantially annular vehicle interior space 20 around the rotor 11. . A combustor 16 is accommodated in the vehicle interior space 20.

  A plurality of combustors 16 are provided around the rotor 11 between the compressor 12 and the turbine 14, and adjacent combustors 16 are connected to each other by a connecting pipe 17. Each combustor 16 includes a fuel nozzle 24 that injects fuel introduced from a fuel supply pipe 22 through a fuel supply chamber 23, and an inner cylinder (combustor liner) 26 in which the fuel supplied from the combustion nozzle 24 is combusted. And a transition piece 28 that guides the combustion gas generated in the inner cylinder 26 to the turbine 14 side. The tubular wall 25 forming the fuel supply chamber 23 is connected to the fuel supply pipe 22 and a branch pipe 66 described later at the flange portion.

As shown in FIGS. 2 and 3, a partition wall 30 is provided around each combustor 16 so as to cover the combustion nozzle 24 and the inner cylinder 26. That is, the partition wall 30 individually covers each combustor 16 (specifically, the combustion nozzle 24 and the inner cylinder 26 of each combustor 16).
By this partition wall 30, the vehicle interior space 20 in which the combustor 16 is accommodated is divided into a first space 20 </ b> A that contacts the vehicle interior wall surface 19 and a second space 20 </ b> B that contacts each combustor 16. In other words, the first space 20 </ b> A in contact with the inner wall surface 19 of the passenger compartment 18 wraps the second space 20 </ b> B around the combustor 16 with the partition wall 30 interposed therebetween. Note that the second space 20B surrounded by the partition walls 30 is a substantially cylindrical space, as shown in FIG.

As shown in FIGS. 3 and 4, a long hole 32 through which the connecting pipe 17 passes is formed in the partition wall 30. The long hole 32 extends along the longitudinal direction of the combustor 16 (combustor longitudinal direction).
Thus, by providing the long hole 32 in the portion where the connecting pipe 17 penetrates the partition wall 30, the connecting pipe 17 attached to the inner cylinder 26 burns relatively to the partition wall 30 due to the thermal expansion of the combustor 16. Even if it moves in the longitudinal direction of the vessel, the connecting pipe 17 and the partition wall 30 do not interfere with each other.

In this case, as shown in FIGS. 3 and 4, a cover plate 34 that contacts the partition wall 30 and covers the long hole 32 may be attached to the connecting pipe 17. The cover plate 34 extends from the connection pipe 17 by L2 on both sides in the combustor longitudinal direction. The extending amount L2 of the cover plate 34 from the connecting pipe 17 is determined so as to satisfy the relationship L2 ≧ L1-D. Here, L 1 is the length of the long hole 32 in the longitudinal direction of the combustor, and D is the outer diameter of the connecting pipe 17.
Thus, by attaching the cover plate 34 satisfying the relationship of L2 ≧ L1-D to the connecting pipe 17, the long hole 32 is covered at any position within the movable range of the combustion pipe 17 regulated by the long hole 32. It can be covered with a plate 34. Therefore, the flow of fluid between the first space 20 </ b> A and the second space 20 </ b> B through the long hole 32 can be reliably prevented by the cover plate 34.

Further, from the viewpoint of improving the sealing member property by the cover plate 34, a viscoelastic material mainly composed of a spring clip or a carbon nanotube is provided between the surface of the cover plate 34 and the outer peripheral surface of the partition wall 30 around the long hole 32. You may provide the sealing member which consists of. Thereby, the flow of the fluid through the gap between the surface of the cover plate 34 and the outer peripheral surface of the partition wall 30 can be reliably prevented.
4A and 4B show an example in which the cover plate 34 is disposed on the outer peripheral surface side of the partition wall 30, the cover plate 34 may be provided on the inner peripheral surface side of the partition wall 30.

  As shown in FIGS. 2 and 5, a seal member 40 is provided between the partition wall 30 and the inner cylinder 26 of the combustor 16. The seal member 40 is a so-called spring clip that couples the partition wall 30 and the inner cylinder 26 by elastic force and seals a gap between them. Details of each part of the seal member 40 are as follows.

The seal member 40 contacts the fixed portion 42 fixed to the outer peripheral surface of the inner cylinder 26, the urging portion 44 bent from the fixed portion 42 radially outward of the inner cylinder 26, and the inner peripheral surface of the partition wall 30. And an abutting portion 46 in contact therewith.
The fixing portion 42 of the seal member 40 is spot welded to the outer peripheral surface of the inner cylinder 26 at the welding position 41 and is fixed to the inner cylinder 26. The urging portion 44 of the seal member 40 is provided between the fixed portion 42 and the abutting portion 46 and has a shape bent toward the outer side in the radial direction of the inner cylinder 26 as the distance from the fixed portion 42 increases. In the attached state of the seal member 40, the urging portion 44 is elastically deformed so as to decrease in diameter toward the inner side in the radial direction of the inner cylinder 26. For this reason, the contact portion 46 is urged radially outward of the inner cylinder 26 by the elastic force of the urging portion 44, and the contact portion 46 is in close contact with the inner peripheral surface of the partition wall 30.

  As described above, the contact portion 46 is in contact with the inner peripheral surface of the partition wall 30 but is not fixed, and can slide on the inner peripheral surface of the partition wall 30. Can absorb the difference in thermal elongation. Therefore, even if the combustor 16 is heated to a higher temperature than the partition wall 30 due to heat generated by combustion and a difference in thermal expansion occurs between them, deformation or destruction of each member due to thermal stress can be prevented.

  5 shows an example in which the fixing portion 42 of the seal member 40 is fixed to the outer peripheral surface of the inner cylinder 26, but the fixing portion 42 may be fixed to the inner peripheral surface of the partition wall 30. In this case, the abutting portion 46 is urged radially inward of the inner cylinder 26 by the elastic force of the urging portion 44, and the abutting portion 46 is brought into close contact with the outer peripheral surface of the inner cylinder 26. Both can be combined while sealing the gap between the cylinder 26.

Further, as shown in FIG. 6, a plurality of slits 48 may be formed in the urging portion 44 and the contact portion 46 over the entire circumference of the seal member 40. The slit 48 extends from the contact portion 46 to the urging portion 44 along the longitudinal direction of the combustor. By providing the slits 48 in this way, the radial deformation (reducing diameter) of the urging portion 44 and the abutting portion 46 can be increased, and the elastic force of the urging portion 44 can be increased to The contact state between the contact portion 46 and the inner peripheral surface of the partition wall 30 can be more reliably maintained.
A plurality of holes 49 are provided between the fixing portion 42 and the urging portion 44, and each hole 49 communicates with a corresponding slit 48. The vicinity of the end portion of the slit 48 on the fixed portion 42 side is a portion of the seal member 40 where stress is easily concentrated. Therefore, by distributing the stress concentrated in this location through the holes 49, cracks in the seal member 40 can be prevented.

  As shown in FIG. 2, a bleed pipe (corresponding to a “compressed air bleed pipe”) 50 communicates with the first space 20A located on the outer peripheral side of the partition wall 30 having the above-described configuration. One end of the extraction pipe 50 is connected to the first space 20 </ b> A inside the passenger compartment 18, and the other end is connected to the air electrode 6 (see FIG. 1) of the fuel cell 2. Thereby, the compressed air that has passed through the compressor 12 is guided to the air electrode 6 of the fuel cell 2 through the extraction pipe 50.

  Further, as shown in FIG. 2, a supply pipe (corresponding to “exhaust air supply pipe”) 60 communicates with the second space 20 </ b> B located on the inner peripheral side of the partition wall 30. The high temperature / high pressure exhaust air discharged from the air electrode 6 of the fuel cell 2 is supplied to the second space 20 </ b> B around each combustor 16 through the supply pipe 60.

The supply pipe 60 includes an upstream pipe 62 connected to the air electrode 6 of the fuel cell 2, a manifold 64 communicating with the upstream pipe 62, and a plurality of branch pipes 66 branched from the manifold 64. . The manifold 64 is an annular conduit provided around the passenger compartment 18, and an upstream conduit 62 is connected to the upper portion of the manifold 64. The center of the annular pipe forming the manifold 64 substantially coincides with the rotation center of the rotor 11. Further, the branch pipe 66 branches from the manifold 64, extends inward in the radial direction of the rotor 11, bends in the middle, and extends in the combustor longitudinal direction toward the combustor 16. The flange portion on the combustor 16 side of the branch pipe 66 is connected to the first casing 18 </ b> A on the compressor 12 side by a bolt 61 and is connected to the partition wall 30 by a bolt 63. A plurality of branch pipes 66 branched from the manifold 64 communicate with the second space 20 </ b> B around each combustor 16.
In the supply pipe 60, exhaust air flowing through the upstream pipe line 62 is reliably distributed to each combustor 16 by the manifold 64 and the branch pipe 66.

  In the gas turbine 10 of this embodiment, the partition space 30 that covers the combustor 16 separates the vehicle interior space 20 into a first space 20A that is in contact with the inner wall surface 19 of the vehicle interior 18 and a second space 20B that is in contact with the combustor 16. A seal member 40 is provided between the combustor 16 and the partition wall 30. For this reason, the movement of the exhaust air in the second space 20B to the first space 20A is blocked by the partition wall 30 and the seal member 40, and the inner wall surface 19 of the passenger compartment 18 is prevented from being directly exposed to the high temperature exhaust air. it can. In addition, since the flow of fluid between the first space 20A and the second space 20B is inhibited by the partition wall 30 and the seal member 40, mixing of exhaust air and compressed air in the passenger compartment 18 can be prevented.

  In the above-described embodiment, the spring clip is shown as a specific example of the seal member 40. However, the seal member 40 can inhibit the flow of fluid between the first space 20A and the second space 20B together with the partition wall 30. If it is a structure, it will not specifically limit. For example, the sealing member 40 is made of a viscoelastic material mainly composed of carbon nanotubes, is fixed to one of the combustor 16 and the partition wall 30, and is pressed against the other (referred to as “other member”). May be used. At this time, the seal member 40 is pressed against the other member to such an extent that the seal member 40 can slide in the combustor longitudinal direction with respect to the other member (a member to which the seal member 40 is not fixed). It is also possible to absorb the difference in thermal expansion from the partition wall 30. Further, as the sealing member 40 in this case, a viscoelastic material mainly composed of carbon nanotubes can be suitably used. Since this viscoelastic material is excellent in heat resistance and can maintain viscoelasticity up to about 1000 ° C., it can be sufficiently used even in a harsh environment near a combustor where heat is generated by combustion.

[Second Embodiment]
Next, a gas turbine according to a second embodiment will be described. The gas turbine according to the present embodiment is the same as the gas turbine 10 according to the first embodiment except for the partition wall that separates the first space 20A and the second space 20B and the surrounding structure. Therefore, below, the same code | symbol is used for the same location as the gas turbine 10, and it demonstrates centering on a different point from the gas turbine 10. FIG.

  FIG. 7 is a cross-sectional view showing the vehicle interior structure around the combustor of the gas turbine according to the present embodiment. FIG. 8 is a view showing the periphery of the partition wall of the gas turbine shown in FIG. 7, and is a cross-sectional view along a direction orthogonal to the longitudinal direction of the combustor.

As shown in FIGS. 7 and 8, in the gas turbine 100, the partition wall 70 includes an inner peripheral side wall 72 disposed on the inner peripheral side of the plurality of combustors 16 and an outer periphery disposed on the outer peripheral side of the plurality of combustors 16. A side wall 74 is included. By the inner peripheral side wall 72 and the outer peripheral side wall 74, the vehicle interior space 20 is partitioned into a first space 20 </ b> A that contacts the inner wall surface 19 of the vehicle interior 18 and a second space 20 </ b> B that contacts the combustor 16. That is, in the present embodiment, the partition wall 70 covers the plurality of combustors 16 in a lump, and the second space 20 </ b> B surrounded by the partition wall 70 is a substantially annular space that houses the plurality of combustors 16.
In this way, when the plurality of combustors 16 are collectively covered with the partition walls 70, unlike the case where each combustor 16 is individually covered with the partition walls 30 as in the first embodiment, adjacent combustors 16 are connected to each other. There is no partition wall penetrating portion of the connecting pipe 17 to be performed. Therefore, a complicated structure (the long hole 32 and the cover plate 34 shown in FIGS. 3 and 4) for absorbing the thermal expansion between the connecting pipe 17 attached to the combustor 16 and the partition wall 70 becomes unnecessary, and the apparatus configuration is reduced. It can be simplified.

A supply pipe (corresponding to “exhaust air supply pipe”) 80 communicates with the substantially annular second space 20B. The supply pipe 80 includes an upstream side pipe 82 connected to the air electrode 6 of the fuel cell 2 and an annular pipe 84 communicating with the upstream side pipe 82. The annular tube 84 is provided around the passenger compartment 18, and the center thereof substantially coincides with the rotation center of the rotor 11.
As a result, the high-temperature and high-pressure exhaust air discharged from the air electrode 6 of the fuel cell 2 passes through the upstream side pipe 82 and the annular pipe 84 in this order, and is exhausted into the substantially annular second space 20B. Is to be guided.

  As mentioned above, although embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to this, In the range which does not deviate from the summary of this invention, various improvement and deformation | transformation may be performed.

For example, in the above-described embodiment, the example in which the partition wall 30 and the partition wall 70 (specifically, the walls 72 and 74 constituting the partition wall 70) are cylindrical extending in the combustor longitudinal direction has been described. Reinforcing ribs may be erected on the surfaces of the peripheral side wall 72 and the outer peripheral side wall 74.
FIG. 9 is a perspective view showing a configuration example of the partition wall 30 in which reinforcing ribs are erected. As shown in the figure, a plurality of reinforcing ribs 31 along the longitudinal direction of the combustor may be erected on the outer surface (or the inner surface) of the partition wall 30.
Compressed air flows from the first space 20A into the air electrode 6 of the fuel cell 2 through the bleed pipe 50, and exhaust air from the air curve 6 flows into the second space 20B through the supply pipes (60, 80). Therefore, the compressed air in the first space 20A located on the upstream side has a slightly higher pressure than the exhausted air in the second space 20B located on the downstream side. Therefore, the partition walls (30, 70) are pressed from the first space 20A side to the second space 20B side. Therefore, as described above, the ribs (30, 70) can be prevented from being deformed by providing the reinforcing ribs 31 to reinforce the partition (30, 70).

  Further, in the above-described embodiment, the example in which the seal member 40 is provided between the partition wall (30, 70) and the inner cylinder 26 has been described. However, the seal member 40 includes the partition wall (30, 70) and the tail cylinder 28. It may be provided between them.

  Furthermore, in the above-described embodiment, the multi-can type gas turbine (10, 100) in which the plurality of combustors 16 are housed in the vehicle interior 18 is taken as an example, but the combustors 16 are housed in the vehicle interior 18. As long as it is, the number is not limited, and a single can may be used. For example, a single can combustor 16 provided in an annular shape over the entire circumference of the rotor 11 may be used.

DESCRIPTION OF SYMBOLS 1 Combined power generation system 2 Fuel cell 4 Fuel electrode 6 Air electrode 8 Electrolyte 10 Gas turbine 11 Rotor 12 Compressor 14 Turbine 16 Combustor 17 Connection pipe 18 Car interior 18A First casing 18B Second casing 19 Inner wall surface 20 Car interior space 20A 1st space 20B 2nd space 22 Fuel supply pipe 23 Fuel supply chamber 24 Fuel nozzle 25 Tubular wall 26 Inner cylinder 28 Tail cylinder 30 Partition 31 Reinforcing rib 32 Long hole 34 Cover plate 40 Seal member 41 Welding position 42 Fixing part 44 With Force part 46 Contact part 48 Slit 49 Hole 50 Extraction pipe (Compressed air extraction pipe)
60 Supply pipe (exhaust air supply pipe)
61 bolt 62 upstream side pipe 63 bolt 64 manifold 66 branch pipe 70 partition wall 72 inner peripheral side wall 74 outer peripheral side wall 80 supply pipe (exhaust air supply pipe)
82 Upstream pipe 84 Annular pipe 100 Gas turbine

Claims (9)

Compressed air that has passed through the compressor is heated by a heating unit outside the passenger compartment, exhaust air and fuel from the heating unit are supplied to the combustor for combustion, and the generated combustion gas is supplied to the turbine for rotational power. A gas turbine for obtaining
A vehicle compartment housing the combustor in a vehicle cabin space into which compressed air that has passed through the compressor flows;
A first space that is provided in the vehicle interior space so as to cover the combustor, and that contacts the inner wall surface of the vehicle interior and through which compressed air from the compressor flows, and a second space that contacts the combustor. A partition wall, and
A seal member provided between the partition wall and the combustor;
A compressed air bleed pipe that communicates with the first space, bleeds compressed air from the first space, and guides it to the heating unit;
An exhaust air supply pipe that communicates with the second space and guides exhaust air that has passed through the heating unit to the second space;
The gas turbine, wherein the exhaust air guided to the second space is taken into the combustor and used for fuel combustion.   The gas turbine according to claim 1, wherein the heater is an air electrode of a fuel cell that forms a combined power generation system together with the gas turbine.   The gas turbine according to claim 1, wherein the seal member absorbs a difference in elongation between the combustor and the partition wall.   The gas turbine according to claim 3, wherein the seal member is a spring clip that seals a gap between the partition wall and the combustor by an elastic force.   The said sealing member consists of a viscoelastic material which has a carbon nanotube as a main component, is fixed to any one of the said combustor and the said partition, and is pressed with respect to the other. Gas turbine. A plurality of the combustors are provided in the vehicle interior space,
The said partition covers each combustor separately, The said 2nd space enclosed by this partition is a substantially cylindrical space which accommodates each combustor, The Claim 1 characterized by the above-mentioned. The gas turbine described. The exhaust air supply pipe includes a plurality of branch pipes that communicate with the second space around each combustor, and the exhaust air that is interposed between the branch pipe and the heating section and passes through the heating section. And a manifold for supplying the branch pipe to
The gas turbine according to claim 6, wherein the manifold is provided around the passenger compartment. A plurality of the combustors are provided in the vehicle interior space,
6. The partition wall according to claim 1, wherein the partition wall collectively covers the plurality of combustors, and the second space surrounded by the partition wall is a substantially annular space that houses the plurality of combustors. A gas turbine according to claim 1.   The gas turbine according to claim 1, further comprising a rib that reinforces the partition wall.

Images