JP2010053745A - Gas turbine exhaust temperature detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas turbine exhaust temperature detection device capable of reducing deterioration in engine performance, while improving detection accuracy in the exhaust temperature. <P>SOLUTION: This gas turbine exhaust temperature detection device 2 includes thermocouples 9 and 10 installed in a strut 5 for connecting an outer peripheral casing 3 and an inner peripheral casing 4. The strut 5 includes a hollow part 15, an introducing hole 18 arranged in the vicinity of the outer peripheral casing 3 and introducing a tip clearance flow into the hollow part 15 from the upstream side of exhaust gas, and a discharge hole 19 for discharging the tip clearance flow introduced into the hollow part 15 to the downstream side of the exhaust gas. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas turbine exhaust temperature detection device.

  2. Description of the Related Art Conventionally, as a gas turbine exhaust temperature detecting device, a device that detects a temperature of a gas flowing into an intake hole by inserting a thermocouple into a gas intake hole provided in a solid metal strut is known. However, in this apparatus, the gas intake hole is made small in order to suppress the deterioration of the gas turbine engine performance. For this reason, the exhaust temperature detected by the thermocouple is easily affected by the temperature of the strut itself. That is, the temperature detected by the thermocouple is lower than the actual gas temperature because the temperature of the strut itself is lower than the exhaust temperature due to heat transfer of the metal. As a result, it is difficult to improve the detection accuracy of the exhaust temperature.

Various attempts have been made to solve the above problems. For example, as described in Japanese Patent Publication No. 2007-515644, a support member for supporting a thermocouple, including a cavity provided therein, a series of holes for introducing exhaust gas into the cavity, and a cavity One having an opening for discharging the gas inside is known. This detection device attempts to improve exhaust gas temperature detection accuracy by inserting a thermocouple into the opening of the support member and detecting the temperature of the gas mixed in the cavity and passing through the opening.
Special table 2007-515644

  However, in the gas turbine exhaust temperature detecting device described above, since there are a plurality of holes through which the exhaust gas is introduced into the cavity of the support member, there is a problem that resistance due to the exhaust gas increases and the performance of the gas turbine engine deteriorates. there were.

  Accordingly, the present invention has been made to solve such a technical problem, and provides a gas turbine exhaust temperature detection device capable of reducing deterioration in engine performance while improving exhaust temperature detection accuracy. The purpose is to provide.

  That is, in the gas turbine exhaust temperature detecting device according to the present invention, an exhaust temperature detecting means is attached to a strut connecting the outer casing and the inner casing, and the temperature of the exhaust gas of the gas turbine is detected. The exhaust gas flow passage is provided in the strut to allow the tip clearance flow that flows through the gap between the tip of the moving blade of the gas turbine and the outer casing from the upstream side to the downstream side of the exhaust gas. And

  According to the present invention, the exhaust gas flow passage for passing the tip clearance flow from the upstream side to the downstream side of the exhaust gas is provided inside the strut. Therefore, the tip clearance flow flowing through the exhaust gas flow passage is The strut can be warmed from the inside of the strut, and the temperature of the strut can be raised from the inside. For this reason, more accurate exhaust gas temperature detection becomes possible, and the detection accuracy of exhaust gas temperature can be improved. In addition, by using the tip clearance flow in this way, it is possible to reliably raise the temperature of the strut from the inside and reduce the deterioration of the engine performance.

  In the gas turbine exhaust temperature detection device according to the present invention, the exhaust gas flow path includes an introduction hole provided in the vicinity of the outer casing for introducing the tip clearance flow from the upstream side of the exhaust gas into the exhaust gas flow path. Is preferred.

  In this case, the tip clearance flow can be taken into the exhaust gas flow passage from the vicinity of the outer casing. The tip clearance flow has a high temperature and a high flow velocity in the vicinity of the outer casing. By incorporating the tip clearance flow from the vicinity of the outer casing in this manner, the temperature of the strut can be reliably increased from the inside, and the introduction hole of the tip clearance flow can be reduced, thereby reducing the decrease in engine performance. it can.

  In the gas turbine exhaust temperature detecting device according to the present invention, the exhaust gas flow passage includes a hollow portion communicating with the introduction hole, and a discharge hole for discharging the tip clearance flow introduced into the hollow portion to the downstream side of the exhaust gas. It is preferable to further include

  In this case, the chip clearance flow is taken into the hollow portion from the introduction hole and discharged to the downstream side of the exhaust gas via the discharge hole. Therefore, the temperature of the strut can be reliably increased from the inside.

  In the gas turbine exhaust temperature detecting device according to the present invention, it is preferable that the introduction hole is inclined with respect to the flow direction of the exhaust gas so as to follow the direction of the tip clearance flow.

  In this case, since the tip clearance flow swirls, the tip clearance flow is made smoother by setting the inclination angle of the introduction hole with respect to the flow direction of the exhaust gas in accordance with the swirling of the tip clearance flow. Can be introduced. As a result, the flow rate of the tip clearance flow introduced into the hollow portion can be increased, and the inside of the strut can be easily warmed.

  In the gas turbine exhaust temperature detection device according to the present invention, it is preferable that there are a plurality of introduction holes, and the inclination angles of the introduction holes with respect to the flow direction of the exhaust gas are different.

  In this case, since the direction of the tip clearance flow changes depending on the operating state of the gas turbine engine, even if the operating state of the engine changes by providing a plurality of introduction holes having different inclination angles, the tip clearance flow Can be reliably introduced into the hollow portion.

  In the gas turbine exhaust temperature detection device according to the present invention, it is preferable that the leading end of the introduction hole is formed in a bell mouth shape that spreads outward.

  In this case, the tip clearance flow can be smoothly introduced into the hollow portion, and the flow rate of the tip clearance flow introduced into the hollow portion can be increased.

  In the gas turbine exhaust temperature detecting device according to the present invention, it is preferable that a guide plate for turning back the tip clearance flow introduced into the hollow portion is provided in the hollow portion.

  In this case, the tip clearance flow path in the hollow portion can be lengthened by folding the tip clearance flow using the guide plate. Therefore, it is possible to increase the amount of heat transferred from the tip clearance flow to the strut and to reliably increase the strut temperature.

  In the gas turbine exhaust gas temperature detection device according to the present invention, it is preferable that the hollow portion is disposed close to the upstream side of the exhaust gas.

  In this case, the peripheral portion of the exhaust temperature detecting means for detecting the temperature of the exhaust gas flowing from the upstream can be locally heated by arranging the hollow portion close to the upstream side of the exhaust gas. The detection accuracy of the exhaust temperature can be improved.

  In the gas turbine exhaust temperature detection device according to the present invention, it is preferable that the discharge hole is provided in the vicinity of the inner peripheral casing.

  In this case, the tip clearance flow path in the hollow portion can be lengthened by introducing the tip clearance flow from the vicinity of the outer peripheral casing into the hollow portion and discharging it from the vicinity of the inner peripheral casing. Therefore, it is possible to increase the amount of heat transferred from the tip clearance flow to the strut and to reliably increase the strut temperature.

  In the gas turbine exhaust temperature detection device according to the present invention, it is preferable that there are a plurality of exhaust holes.

  In this case, the amount of heat transferred from the tip clearance flow to the strut can be adjusted by adjusting the time during which the tip clearance flow stays in the hollow portion, and the detection accuracy of the exhaust temperature can be improved. .

  In the gas turbine exhaust temperature detection device according to the present invention, it is preferable that a thin plate-like fin is attached to the outer wall of the strut.

  In this case, the heat transfer area of the strut can be increased, heat exchange can be promoted, and the temperature of the strut can be reliably increased.

  According to the present invention, it is possible to provide a gas turbine exhaust temperature detection device capable of reducing deterioration in engine performance while improving the detection accuracy of the exhaust temperature.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic configuration diagram of a gas turbine exhaust temperature detection device according to an embodiment of the present invention. The gas turbine exhaust temperature detection device 2 according to the present embodiment is disposed in the exhaust part of the gas turbine engine 1 and detects the temperature of the exhaust gas.

  As shown in FIG. 1, a gas turbine engine 1 includes an outer casing 3, an inner casing 4 disposed inside the outer casing 3, and a metal strut disposed between the outer casing 3 and the inner casing 4. 5 is provided. The outer peripheral casing 3 and the inner peripheral casing 4 are each formed in a cylindrical shape, and are connected by struts 5 so that the cylindrical central axis L1 substantially coincides. As a result, an annular exhaust gas passage 6 is formed between the outer casing 3 and the inner casing 4. Then, the exhaust gas is exhausted to the outside through the exhaust gas passage 6 along the direction indicated by the arrow F1 (that is, the exhaust gas flow direction).

  There are a plurality of struts 5, and the struts 5 are evenly arranged at regular intervals along the circumferential direction of the exhaust gas passage 6. A moving blade 7 at the final stage of the gas turbine engine 1 is disposed in front of the strut 5 (that is, upstream of the exhaust gas). The moving blade 7 is fixed to the rotating shaft 8. The gas turbine exhaust temperature detection device 2 includes a pair of thermocouples 9 and 10 attached to the strut 5. The thermocouples 9 and 10 function as exhaust temperature detection means for detecting the temperature of the exhaust gas. In this embodiment, in addition to the thermocouples 9 and 10, other temperature sensors may be used as the exhaust gas temperature detection means.

  FIG. 2 is a cross-sectional view showing the strut. As shown in FIG. 2, the strut 5 is formed in a substantially elliptical cross section, and includes a front wall 11 positioned upstream of the exhaust gas, a rear wall 12 positioned downstream of the exhaust gas, a front wall 11 and a rear wall. Side wall 13 and 14 which are mutually parallel between face wall 12 are provided. The space surrounded by the front wall 11, the rear wall 12, and the side walls 13 and 14 forms a hollow portion 15 that extends from the outer casing 3 side to the inner casing 4. In FIG. 2, L2 is a center line along the exhaust gas flow direction F1, and the strut 5 is symmetrical with respect to the center line L2.

  As shown in FIG. 1, the front wall 11 is provided with two concave portions 16 and 17. These recesses 16 and 17 are opened toward the upstream side of the exhaust gas so as to take in the exhaust gas therein, and extend along the flow direction F1 of the exhaust gas. Inside the recesses 16 and 17, tip portions of the thermocouples 9 and 10 are inserted.

  An introduction hole 18 penetrating the front wall 11 is provided in the vicinity of the outer peripheral casing 3 of the front wall 11. The introduction hole 18 is for introducing the tip clearance flow (see arrow F2) flowing through the gap between the tip of the moving blade 7 and the outer casing 3 into the hollow portion 15 from the upstream side of the exhaust gas. The introduction hole 18 is inclined at a predetermined angle with respect to the center line L2 so as to follow the direction of the tip clearance flow (see FIG. 2).

  A discharge hole 19 penetrating the rear wall 12 is provided in the vicinity of the inner peripheral casing 4 of the rear wall 12. The discharge hole 19 is for discharging the tip clearance flow introduced into the hollow portion 15 to the downstream side of the exhaust gas. The hollow portion 15, the introduction hole 18, and the introduction hole 18 constitute an exhaust gas flow passage for passing the tip clearance flow from the upstream side to the downstream side of the exhaust gas.

  According to the gas turbine exhaust temperature detecting device 2 configured as described above, the hollow portion 15 is provided inside the strut 5, and the tip clearance flow of the moving blade 7 is exhausted in the vicinity of the outer peripheral casing 3 of the front wall 11. Since the introduction hole 18 for introducing the gas into the hollow portion 15 from the upstream side is provided, the tip clearance flow can be taken into the hollow portion 15 from the vicinity of the outer casing 3. This tip clearance flow can warm the strut 5 from the inside of the strut 5 and raise the temperature of the strut 5 from the inside. For this reason, more accurate exhaust gas temperature detection becomes possible, and the exhaust gas temperature detection accuracy can be improved.

  Moreover, the tip clearance flow has a high temperature and a high flow velocity in the vicinity of the outer casing 3. By incorporating the tip clearance flow into the hollow portion 15 from the vicinity of the outer casing 3 in this manner, the temperature of the strut 5 can be reliably increased from the inside, and the introduction hole 18 for the tip clearance flow can be reduced. As a result, a decrease in engine performance can be reduced.

  A discharge hole 19 for discharging the tip clearance flow in the hollow portion 15 to the downstream side of the exhaust gas is provided in the vicinity of the inner peripheral casing 4 of the rear wall 12. By introducing the tip clearance flow from the vicinity of the outer peripheral casing 3 into the hollow portion 15 and discharging from the vicinity of the inner peripheral casing 4 in this way, the path of the tip clearance flow in the hollow portion 15 can be lengthened. Accordingly, the amount of heat transferred from the tip clearance flow to the strut 5 can be increased, and the temperature of the strut 5 can be reliably increased.

  Further, since the tip clearance flow flows while swirling, the tip clearance flow can be smoothly introduced into the hollow portion 15 by setting the inclination angle of the introduction hole 18 with respect to the center line L2 in accordance with the swirling of the tip clearance flow. it can. As a result, the flow rate of the tip clearance flow introduced into the hollow portion 15 can be increased, and the inside of the strut 5 can be easily warmed.

  Next, a modification of the strut 5 of the gas turbine exhaust temperature detection device 2 according to this embodiment will be described with reference to FIGS.

  In the modification shown in FIG. 3, the strut 20 includes three introduction holes 21, 22, and 23. These introduction holes 21, 22, and 23 are both provided in the vicinity of the outer casing 3 of the front wall 11, and introduce the tip clearance flow of the moving blade 7 into the hollow portion 15 from the upstream side of the exhaust gas. These introduction holes 21, 22, and 23 have different inclination angles with respect to the center line L2.

  Since the gas turbine exhaust temperature detecting device including the strut 20 configured as described above has the same effect as the above-described embodiment and includes the three introduction holes 21, 22 and 23 having different inclination angles, the chip The clearance flow is surely introduced into the hollow portion 15. That is, the direction of the tip clearance flow changes depending on the operating state of the gas turbine engine 1, and even if the operating state of the gas turbine engine 1 is changed by providing a plurality of introduction holes having different inclination angles as described above, the tip clearance is also changed. It is possible to reliably introduce the flow into the hollow portion 15.

  In the modification shown in FIG. 4, the introduction hole 25 of the strut 24 is inclined at a predetermined angle with respect to the center line L2. And the front-end | tip part 25a of the introduction hole 25 is formed in the bellmouth shape which spreads outward.

  The gas turbine exhaust temperature detecting device including the strut 24 configured as described above can obtain the same effect as the above-described embodiment, and is formed in a bell mouth shape in which the distal end portion 25a of the introduction hole 25 extends outward. Therefore, the tip clearance flow can be smoothly introduced into the hollow portion 15, and the flow rate of the tip clearance flow introduced into the hollow portion 15 can be increased.

  In the modification shown in FIG. 5, guide plates 27 and 28 are provided in the hollow portion 15 of the strut 26 for turning back the chip clearance flow introduced therein. The guide plates 27 and 28 are arranged so as to be alternately positioned in the vertical direction with a predetermined distance from the introduction hole 18 side to the discharge hole 19 side. Then, the tip clearance flow introduced into the hollow portion 15 by the arrangement of the guides 27 and 28 is discharged to the downstream side of the exhaust gas through the discharge hole 19 while turning back along the arrow F3.

  The gas turbine exhaust temperature detecting device including the strut 26 configured as described above can obtain the same effects as those of the above-described embodiment, and can turn back the tip clearance flow flowing in the hollow portion 15 using the guide plates 27 and 28. Thereby, the path | route of the chip clearance flow in the hollow part 15 can be lengthened. Therefore, the amount of heat transferred from the tip clearance flow to the strut 26 can be increased, and the temperature of the strut 26 can be reliably increased.

  In the modification shown in FIG. 6, the hollow portion 30 of the strut 29 is arranged close to the upstream side of the exhaust gas. That is, only the vicinity of the front wall 11 where the thermocouples 9 and 10 are installed is made hollow.

  The gas turbine exhaust temperature detecting device including the strut 29 configured as described above can obtain the same effect as that of the above embodiment, and can be provided by placing the hollow portion 30 close to the upstream side of the exhaust gas, thereby providing a thermocouple. It is possible to locally raise the temperature in the vicinity of 9 and 10 and improve the detection accuracy of the exhaust temperature.

  In the modification shown in FIG. 7, the discharge hole 32 provided in the rear wall 12 is disposed at a location away from the inner casing 4 by a predetermined distance. For example, the discharge hole 32 is disposed between the recess 16 and the recess 17 in the vertical direction.

  The gas turbine exhaust temperature detecting device including the strut 31 configured as described above can obtain the same effect as that of the above embodiment, and the exhaust hole 32 is provided at a location away from the inner casing 4. Compared with the discharge hole 19 provided in the vicinity of the casing 4, the tip clearance flow introduced into the hollow portion 15 is less likely to escape from the discharge hole 32. As a result, the time during which the tip clearance flow stays in the hollow portion 15 becomes longer, and the amount of heat transferred from the tip clearance flow to the strut 31 can be increased.

  In the modification shown in FIG. 8, the rear wall 12 is provided with discharge holes 34, 35 and 36 in addition to the discharge hole 19. These discharge holes 34, 35, and 36 are arranged in parallel at substantially equal intervals from the outer casing 3 side to the inner casing 4 side.

  The gas turbine exhaust temperature detecting device including the strut 33 configured as described above can obtain the same effect as the above-described embodiment, and also has a plurality of discharge holes 19, 34, 35, and 36, thereby providing a tip clearance flow. It is possible to shorten the time during which the gas stays in the hollow portion 15 and appropriately reduce the amount of heat transferred from the tip clearance flow to the strut 33. As a result, an excessive temperature rise of the strut 33 due to the tip clearance flow is suppressed, and a more accurate exhaust gas temperature detection becomes possible.

  In the modification shown in FIG. 9, a plurality of thin plate-like fins 38 are attached to the side walls (outer walls) 13, 14 of the strut 37. The gas turbine exhaust temperature detection device including the strut 37 configured as described above can obtain the same effect as that of the above-described embodiment, and by attaching a plurality of fins 38 to the side walls 13 and 14, The area can be increased, heat exchange can be promoted, and the temperature of the strut 37 can be reliably increased.

  The gas turbine exhaust temperature detection device according to the present invention is not limited to the one described above. The gas turbine exhaust temperature detection device according to the present invention may be a modification of the gas turbine exhaust temperature detection device according to the embodiment or application to other devices without changing the gist described in each claim. Good.

It is a schematic block diagram of the gas turbine exhaust temperature detection apparatus which concerns on embodiment of this invention. It is a cross-sectional view showing a strut. It is a cross-sectional view which shows the modification of a strut. It is a cross-sectional view which shows the modification of a strut. It is a longitudinal cross-sectional view which shows the modification of a strut. It is a longitudinal cross-sectional view which shows the modification of a strut. It is a longitudinal cross-sectional view which shows the modification of a strut. It is a longitudinal cross-sectional view which shows the modification of a strut. It is a perspective view which shows the modification of a strut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas turbine engine, 2 ... Gas turbine exhaust temperature detection apparatus, 3 ... Outer casing, 4 ... Inner casing, 5, 20, 24, 26, 29, 31, 33, 37 ... Strut, 7 ... Moving blade, 9 , 10 ... Thermocouple (exhaust temperature detection means), 15, 30 ... hollow part, 18, 21, 22, 23, 25 ... introduction hole, 19, 32, 34, 35, 36 ... discharge hole, 25a ... tip part, 27, 28 ... guide plates, 38 ... fins, F1 ... flow direction of exhaust gas.

Claims (11)

In the gas turbine exhaust temperature detecting device, the exhaust temperature detecting means is attached to the strut connecting the outer casing and the inner casing, and the temperature of the exhaust gas of the gas turbine is detected.
Inside the strut, an exhaust gas flow passage is provided for passing a tip clearance flow that flows through a gap between a tip of a moving blade of a gas turbine and the outer casing from the upstream side to the downstream side of the exhaust gas. A gas turbine exhaust temperature detecting device.   The exhaust gas flow passage includes an introduction hole provided near the outer casing for introducing a tip clearance flow into the exhaust gas flow passage from an upstream side of the exhaust gas. The gas turbine exhaust gas temperature detection apparatus as described.   The exhaust gas flow passage further includes a hollow portion communicating with the introduction hole, and a discharge hole for discharging the tip clearance flow introduced into the hollow portion to the downstream side of the exhaust gas. Item 3. The gas turbine exhaust temperature detection device according to Item 2.   4. The gas turbine exhaust temperature detection device according to claim 2, wherein the introduction hole is inclined with respect to a flow direction of the exhaust gas so as to be along a direction of the tip clearance flow. 5.   The gas turbine exhaust temperature detection device according to claim 4, wherein there are a plurality of the introduction holes, and the inclination angles of the plurality of introduction holes with respect to the flow direction of the exhaust gas are different.   The gas turbine exhaust temperature detection device according to any one of claims 2 to 5, wherein a tip end portion of the introduction hole is formed in a bell mouth shape that spreads outward.   The gas turbine exhaust temperature detection device according to any one of claims 3 to 6, wherein a guide plate for turning back a chip clearance flow introduced into the hollow portion is provided in the hollow portion.   The gas turbine exhaust temperature detection device according to any one of claims 3 to 7, wherein the hollow portion is disposed close to an upstream side of the exhaust gas.   The gas turbine exhaust temperature detection device according to any one of claims 3 to 8, wherein the discharge hole is provided in the vicinity of the inner peripheral casing.   The gas turbine exhaust temperature detecting device according to any one of claims 3 to 9, wherein there are a plurality of the exhaust holes. The gas turbine exhaust gas temperature detection device according to claim 1, wherein a thin plate-like fin is attached to the outer wall of the strut.

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