JP7322525B2 - Exhaust gas temperature detector - Google Patents

Description

The present invention relates to an exhaust gas temperature detection device.

2. Description of the Related Art Conventionally, an exhaust gas temperature detection device is known that uses a thermocouple to detect the temperature of exhaust gas discharged from a heat source such as an engine of an automobile or the like or a gas turbine. For example, Patent Document 1 and Patent Document 2 disclose this type of exhaust gas temperature detection device. Patent Literature 1 describes an exhaust gas temperature detection device that measures the exhaust gas temperature by inserting a tip of a thermocouple into an exhaust gas flow path of a gas turbine. Patent Literature 2 describes an exhaust gas temperature detection device provided with an adapter section in which a connecting portion is fixed with an insulating filler in order to insulate the connecting portion between a thermocouple and a compensating lead wire.

JP 2007-309219 A JP 2009-192310 A

When measuring the exhaust gas temperature by inserting the thermocouple of the exhaust gas temperature detection device into the exhaust gas flow path, the adapter part of the exhaust gas temperature detection device may be attached to the outer wall of the exhaust gas flow path or its vicinity. Since the exhaust gas discharged from the gas turbine is at a high temperature, the temperature of the outer wall of the exhaust gas flow path and its vicinity exceeds the heat resistance temperature of the filler filled in the adapter section, and the filler inside the adapter section peels off, resulting in insulation failure. may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exhaust gas temperature detection device that can prevent the filler from peeling off by suppressing the influence of heat on the adapter when detecting the temperature of the exhaust gas.

The present invention is an exhaust gas temperature detection device attached to the outer surface of an outer wall of a flow path for exhaust gas discharged from a heat source, wherein a temperature detection unit for detecting the temperature of exhaust gas is arranged in the flow path, and the outer wall is a thermocouple extending to the outer surface side of the outer wall through a conductive wire connected to the thermocouple on the outer surface side of the outer wall; and a connection portion between the thermocouple and the conductive wire via an insulating filler The present invention relates to an exhaust gas temperature detection device provided with an adapter portion that covers and a support member that supports the adapter portion at a position away from the outer surface of the outer wall.

The adapter section includes a cylindrical member filled with the filler inside, a heat-insulating coating layer formed outside the sleeve, and disposed outside the coating layer, the adapter section and the support member. and a heat-insulating binding member that binds the

A plurality of the thermocouples are arranged in a predetermined direction, the support member is rod-shaped and extends along the arrangement direction of the thermocouples, and the plurality of adapter portions are fixed in the predetermined direction at intervals.

Advantageous Effects of Invention According to the present invention, it is possible to provide an exhaust gas temperature detection device that can prevent the filler from peeling off by suppressing the influence of heat on the adapter portion when detecting the exhaust gas temperature.

It is a schematic diagram showing power generation equipment 100 concerning one embodiment of the present invention. Fig. 2 is a perspective view showing an outer wall 152 of an exhaust plenum 150 before installing an exhaust gas temperature detection device 1 according to an embodiment of the present invention; 1 is a perspective view showing a state in which an exhaust gas temperature detection device 1 according to an embodiment of the present invention is attached to an outer wall 152 of an exhaust plenum 150; FIG. 1 is a perspective view showing an exhaust gas temperature detection device 1 according to one embodiment of the present invention; FIG. 3 is a cross-sectional view showing an adapter portion 30 and a support member 40 of the exhaust gas temperature detection device 1 according to one embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

An exhaust gas temperature detection device 1 according to an embodiment of the present invention is a device for detecting the temperature of exhaust gas discharged from a heat source. The heat source is not particularly limited as long as it emits high-temperature exhaust gas, and examples thereof include engines of vehicles and gas turbines of power generation equipment. In this embodiment, an exhaust gas temperature detection device 1 for detecting the exhaust gas temperature of the gas turbine 130 of the power generation facility 100 will be described as an example.

First, a power generation facility 100 in which the exhaust gas temperature detection device 1 is used will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a schematic diagram showing the main part of the power generation equipment 100, and FIG. 2 is a perspective view showing the outer wall 152 of the exhaust plenum 150 of the power generation equipment 100 as seen from the generator 170 side (the right side of the paper surface in FIG. 1). The arrows in FIG. 1 indicate the flow of air or exhaust gas.

As shown in FIG. 1, the power generation facility 100 includes an air intake chamber 110, an intake passage 120 provided downstream of the air intake chamber 110, a gas turbine 130, an exhaust gas passage 140, and a generator 170. , provided.

The air intake chamber 110 is a device that takes in air from the outside. Air intake channel 120 is a channel through which air taken from air intake chamber 110 flows. The air taken into the air intake chamber 110 passes through the intake passage 120 and is sent to the gas turbine 130 .

Gas turbine 130 is a prime mover that converts thermal energy into mechanical work. In the gas turbine 130, the air sent from the intake passage 120 is mixed with fuel such as natural gas or light oil and combusted to generate high-temperature, high-pressure combustion gas. Gas turbine 130 is rotationally driven by high-temperature, high-pressure combustion gas. The combustion gas used to rotationally drive the gas turbine 130 is discharged as exhaust gas from the downstream side of the gas turbine 130 in the axial direction (the right side of the paper in FIG. 1 ) and sent to the exhaust gas flow path 140 .

The exhaust gas channel 140 is a channel through which the exhaust gas discharged from the gas turbine 130 flows, and includes an exhaust plenum 150 and an exhaust duct 160 .

The exhaust plenum 150 is a substantially rectangular parallelepiped space located between the gas turbine 130 and an exhaust duct 160 which will be described later. The exhaust plenum 150 is formed by a casing 151 that covers the axially downstream end of the gas turbine 130 and is connected to the gas turbine 130 and the exhaust duct 160 .

FIG. 2 is a view showing an outer surface 152b of an outer wall 152 of the casing 151, which has a surface (inner surface 152a) facing the downstream end of the gas turbine 130 in the axial direction. A joint portion 153 , a thermocouple insertion portion 154 , and a support member 40 are formed on the outer wall 152 . The support member 40 will be described later.

A joint portion 153 that is a joint portion between the casing 151 and the gas turbine 130 is formed on the peripheral edge of the outer wall 152 . The joint 153 is bolted.

The thermocouple insertion portion 154 is a columnar member and has a through hole 154a penetrating along the central axis. The thermocouple insertion portion 154 is arranged so that the center axis is perpendicular to the outer surface 152 b of the outer wall 152 . The through hole 154 a penetrates the outer wall 152 and reaches the exhaust plenum 150 . A thermocouple 10 , which will be described later, is inserted into the through hole 154 a of the thermocouple insertion portion 154 . By inserting the thermocouple 10 into the thermocouple insertion portion 154 , the thermocouple 10 and the exhaust gas flowing through the exhaust plenum 150 come into contact with each other. A plurality of thermocouple insertion portions 154 are circumferentially arranged around the rotating shaft of the gas turbine 130 on the outer surface 152 b of the outer wall 152 .

The exhaust duct 160 is a flow path that guides exhaust gas to an exhaust heat recovery boiler (not shown). Exhaust gas discharged from the gas turbine 130 passes through an exhaust plenum 150 through an exhaust duct 160 and is sent to a heat recovery steam generator (not shown).

The generator 170 is a device that is connected to the gas turbine 130 and generates electric power as the gas turbine 130 rotates. The generator 170 is arranged outside the exhaust gas flow path 140 . Specifically, the generator 170 is arranged on the opposite side of the gas turbine 130 across the outer wall 152 .

Next, the exhaust gas temperature detection device 1 according to this embodiment will be described with reference to FIGS. 3 is a perspective view showing a state in which the exhaust gas temperature detection device 1 is attached to the outer wall 152 of the exhaust plenum 150, FIG. 4 is a perspective view of the exhaust gas temperature detection device 1, and FIG. It is sectional drawing which shows a state.

As shown in FIG. 4, the exhaust gas temperature detection device 1 includes a thermocouple 10, a compensating lead wire 20, a support member 40, and an adapter portion 30. As shown in FIG.

The thermocouple 10 includes two types of thermocouple wires (not shown), and only one ends of the two types of thermocouple wires are electrically joined for the purpose of generating a thermoelectromotive force. The junction of the two types of thermocouple wires functions as a temperature detection unit 11 capable of detecting the temperature of the temperature measurement object by contacting the temperature measurement object. The temperature detection portion 11 of the thermocouple 10 is inserted from the through hole 154a of the thermocouple insertion portion 154 and arranged in the exhaust plenum 150 in a state of penetrating the outer wall 152 (see FIG. 1). When the temperature detection part 11 of the thermocouple 10 is arranged inside the exhaust plenum 150, the temperature of the exhaust gas flowing through the inside of the exhaust plenum 150 is detected. At this time, the end portion of the thermocouple 10 opposite to the temperature detecting portion 11 is arranged on the outer surface 152 b side of the outer wall 152 .

Further, as shown in FIG. 3, a plurality of thermocouples 10 are arranged in the circumferential direction around the rotating shaft of the gas turbine 130 on the outer surface 152b. Since the outer wall 152 is a wall facing the downstream end of the gas turbine 130 from which the exhaust gas is discharged, the temperature of the exhaust plenum 150 is detected from the outer surface 152b of the outer wall 152, so that the combustion of the gas turbine 130 is detected. The status can be checked more safely and accurately.

The compensating lead wire 20 is a lead wire connected to the end of the thermocouple 10 opposite to the temperature detecting section 11 . The compensating lead wire 20 compensates for a thermoelectromotive force substantially equal to that of the thermocouple wire of the thermocouple 10 to which it is connected. The compensating wire 20 is arranged along the supporting member 40 .

The support member 40 is a rod-shaped member arranged along the outer surface 152b of the outer wall 152, as shown in FIGS. The support member 40 fixes the adapter section 30 described later at a position spaced apart from the outer side surface 152 b of the outer wall 152 . The support member 40 is fixed by a plurality of guide portions 41 erected at predetermined intervals in a direction orthogonal to the outer surface 152b. Further, the support member 40 extends along the arrangement direction of the plurality of thermocouples 10 so as to form an arc around the rotation axis of the gas turbine 130 on the outer surface 152b.

As shown in FIG. 5, a coating layer 42 having a heat insulating effect is formed on the outer peripheral surface of the support member 40 . The coating layer 42 is formed by winding a heat-insulating Teflon (registered trademark) spiral tube. With this configuration, the support member 40 contacts the adapter portion 30 while the outer peripheral surface thereof is covered with the heat-insulating coating layer 42 , so that heat transmitted from the support member 40 to the adapter portion 30 can be suppressed.

Further, the support member 40 is arranged between the joint portion 153 and the thermocouple insertion portion 154 on the outer surface 152 b of the outer wall 152 . A seam portion 153 , which is a seam portion between the casing 151 and the gas turbine 130 , conducts the heat of the exhaust gas flowing through the exhaust plenum 150 more easily than other portions of the outer wall 152 . For this reason, it is preferable that the support member 40 is separated from the joint portion 153 by a predetermined distance and arranged on the side of the thermocouple insertion portion 154 (bottom left side of the drawing).

The adapter portion 30 is a member that accommodates a connecting portion between the pair of thermocouple wires of the thermocouple 10 and the compensating lead wire 20 . As shown in FIG. 5, the adapter part 30 includes a sleeve 31 filled with a filler 32 inside, coating layers 33 and 34, an aluminum tape 35 (first binding member) as a binding member, and Teflon (registered trademark). ) spiral tube 36 (second binding member).

The sleeve 31 is a cylindrical member whose outer peripheral surface is formed of metal and whose inside is filled with a filler 32 . In this embodiment, SUS304 is used as the metal of the sleeve 31 . With this configuration, the connecting portion between the thermocouple 10 and the compensating lead wire 20 is covered with the insulating filler 32 to maintain the insulation of the connecting portion. The filler 32 is not particularly limited as long as it has insulating properties and heat resistance, and examples thereof include epoxy resin such as ecobond.

The coating layers 33 and 34 are layers formed outside the sleeve 31 and having a heat insulating effect. The coating layer 33 is formed by winding a heat insulating tape around the outer peripheral surface of the sleeve 31 . The heat insulating tape is made of a material having heat insulating properties. The coating layer 34 is formed by winding a heat-insulating glass tape around the sleeve 31 wrapped with a heat insulating tape.

The aluminum tape 35 and the Teflon (registered trademark) spiral tube 36 are heat-insulating binding members that bind the adapter section 30 and the support member 40 together. The adapter portion 30 and the support member 40 are wrapped with an aluminum tape 35 so as to be in contact with each other. The aluminum tape 35 is formed outside the covering layer 34 of the adapter portion 30 and the covering layer 42 of the support member 40 . A Teflon (registered trademark) spiral tube 36 is formed outside the aluminum tape 35 wound around the adapter portion 30 and the support member 40 . The adapter part 30 is fixed to the support member 40 by the aluminum tape 35 and the Teflon (registered trademark) spiral tube 36, and two more heat insulating layers are formed.

As shown in FIGS. 3 and 4 , the other end side of the thermocouple 10 and the compensating lead wire 20 are supported by the support member 40 at positions separated from the outer surface 152 b of the outer wall 152 in addition to the adapter portion 30 . The other end side of the thermocouple 10 and the compensating lead wire 20 are wrapped with a Teflon (registered trademark) spiral tube 36 together with the supporting member 40 . The aluminum tape 35 is wound around at least the adapter portion 30 , but may be wound around the entire member supported by the support member 40 including the other end side of the thermocouple 10 and the compensating wire 20 .

According to the exhaust gas temperature detection device 1 according to the present embodiment described above, the following effects are obtained.

The exhaust gas temperature detection device 1 is attached to the outer surface 152b of the outer wall 152 of the exhaust gas flow path 140 of the exhaust gas discharged from the gas turbine 130, and the temperature detection unit 11 for detecting the temperature of the exhaust gas is The thermocouple 10 arranged in the exhaust gas flow path 140 and extending to the outer surface 152b side of the outer wall 152 via the outer wall 152, the compensating lead wire 20 connected to the thermocouple 10 on the outer surface 152b side of the outer wall 152, and the thermocouple and a support member 40 supporting the adapter portion 30 at a position away from the outer surface 152 b of the outer wall 152 .

Here, if the temperature around the adapter portion 30 exceeds the heat-resistant temperature of the filler 32, the filler 32 filled inside the sleeve 31 may peel off due to the difference in thermal expansion coefficient between the sleeve 31 and the filler 32. There is If the filling material 32 peels off, insulation failure or the like may occur between the thermocouple 10 and the compensating lead wire 20, and the quality of the exhaust gas temperature detection device 1 may be deteriorated.

In contrast, in the present embodiment, the adapter section 30 is supported by the support member 40 at a position separated from the outer surface 152b of the outer wall 152, so that the temperature around the adapter section 30 can be suppressed. Therefore, compared with the case of fixing to the outer surface 152b of the outer wall 152 or the vicinity of the outer surface 152b, the thermal influence on the adapter portion 30 can be reduced.

Moreover, when the temperature around the adapter portion 30 is high, it is necessary to use a filler 32 with higher heat resistance, and the types of fillers that can be used for the exhaust gas temperature detection device 1 are also limited. In contrast, in the present embodiment, the temperature around the adapter portion 30 can be suppressed, so more types of fillers can be used for the exhaust gas temperature detection device 1 .

The adapter portion 30 includes a sleeve 31 filled with a filler 32 inside, heat-insulating coating layers 33 and 34 formed outside the sleeve 31, and arranged outside the coating layers 33 and 34. and a heat-insulating aluminum tape 35 and a Teflon (registered trademark) spiral tube 36 for bundling the support member 40 .

As a result, since the filler 32 arranged inside the adapter portion 30 is protected by the plurality of laminated heat insulating layers, the heat transmitted from the outside air around the adapter portion 30 and the support member 40 to the filler 32 is prevented. can be reduced. Moreover, since the outer peripheral surface of the support member 40 is also protected by the heat-insulating binding member, the heat transmitted from the outer wall 152 to the support member 40 can be reduced. Therefore, the heat transmitted to the filler 32 of the adapter portion 30 can be suppressed more effectively.

Moreover, a plurality of thermocouples 10 are arranged in a predetermined direction, the support member 40 is rod-shaped extending along the arrangement direction of the thermocouples 10, and the plurality of adapter portions 30 are fixed at intervals in the predetermined direction.

As a result, the support member 40 is arranged near the plurality of thermocouples 10 , so that the adapter portion 30 corresponding to each thermocouple 10 can be easily attached to the support member 40 . Therefore, it is possible to suppress the thermal influence of the outer wall 152 on each adapter portion 30 and to easily perform the work of detecting the exhaust gas temperature at a plurality of positions.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate.

In the above-described embodiment, the exhaust gas temperature detection device 1 and the thermocouple insertion portion 154 are arranged on the outer wall 152 of the exhaust plenum 150, but the exhaust gas temperature detection device 1 and the thermocouple insertion portion 154 are arranged on the outer wall of the exhaust duct 160. , the temperature of the exhaust gas flowing through the exhaust duct 160 may be detected.

1 Exhaust Gas Temperature Detector 10 Thermocouple 11 Temperature Detector 20 Lead Wire (Compensation Lead Wire)
30 Adapter Part 32 Filler 40 Supporting Member 130 Gas Turbine (Heat Source)
140 Exhaust gas channel (channel)
152 outer wall 152b outer surface

Claims (3)

An exhaust gas temperature detection device attached to the outer surface of the outer wall of the flow path of the exhaust gas discharged from the heat source,
a thermocouple having a temperature detection unit that detects the temperature of exhaust gas disposed in the flow path and extending to the outer surface side of the outer wall through the outer wall;
a conductor connected to the thermocouple on the outer surface side of the outer wall;
an adapter part that covers the connecting part between the thermocouple and the lead wire via an insulating filler;
a support member that supports the adapter portion at a position away from the outer surface of the outer wall ;
The adapter section includes a cylindrical member filled with the filler inside,
a heat-insulating coating layer formed on the outside of the tubular member;
An exhaust gas temperature detection device , comprising: a heat insulating binding member arranged outside the coating layer and binding the adapter portion and the support member. A plurality of the thermocouples are arranged in a predetermined direction,
2. The exhaust gas temperature detection device according to claim 1 , wherein the support member is rod-shaped and extends along the direction in which the thermocouples are arranged, and the plurality of adapter portions are fixed at intervals in a predetermined direction. An exhaust gas temperature detection device attached to the outer surface of the outer wall of the flow path of the exhaust gas discharged from the heat source,
a thermocouple having a temperature detection unit that detects the temperature of exhaust gas disposed in the flow path and extending to the outer surface side of the outer wall through the outer wall;
a conductor connected to the thermocouple on the outer surface side of the outer wall;
an adapter part that covers the connecting part between the thermocouple and the lead wire via an insulating filler;
a support member that supports the adapter portion at a position away from the outer surface of the outer wall ;
A plurality of the thermocouples are arranged in a predetermined direction,
The exhaust gas temperature detection device, wherein the support member is rod-shaped and extends along the direction in which the thermocouples are arranged, and the plurality of adapter portions are fixed at intervals in a predetermined direction.

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