JP2023033189A - Optical fiber module for flame detection in combustor of gas turbine {fiber-cable module for flame scanner} - Google Patents

Abstract

To provide an optical cable module for flame detection in a combustor of a gas turbine.SOLUTION: An optical cable module for flame detection in a combustor of a gas turbine comprises: a first body 510 that detachably connects a first coupler 500 connecting first optical fibers and a second coupler 600 connecting second optical fibers by a joint part 400, and through which a first communication hole part 512 is opened so as to be open on both sides along an axial direction by the first coupler; and a first surface contact pad 520 that forms a first mounting hole 522 sized to insert the first optical fiber exposed on the other side of the first body, and is fixed to the other side of the first body. The first communication hole part has a size and number that allow axial insertion of the first optical fiber into a plurality of cores.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a flame sensing optical cable module for a combustor of a gas turbine, and more particularly, to an optical cable module for virtually reproducing an actual flame condition inside a combustor of a gas turbine. If the fiber is provided with a first coupler, the detector-side optical fiber is provided with a second coupler, and it is determined that the combustor-side optical fiber is degraded or has reduced durability, the combustor-side optical cable module To reduce maintenance and repair costs because only the optical fiber can be separated and replaced, and to prevent damage due to breakage of the optical fiber extending from the first coupler to the outside by providing a hard protective tube for the optical fiber on the combustor side. The present invention relates to optical cable modules for gas turbine combustor flame sensing.

Generally, a gas turbine in a power plant is formed with a combustor, and fuel must be continuously supplied to the combustor so that combustion takes place. is equipped with a flame detector.

The sensing of the flame sensing device will determine the interruption of combustion and the size of the flame and will control the fuel supply in the control means.

However, if the flame detector itself is aged and cannot detect accurate flame information, or if the optical cable module that transmits the information detected by the flame detector is deteriorated and accurate information cannot be transmitted, the boiler will be damaged. There is a problem that the accuracy of combustion control and fuel supply control drops.

The background art of the present invention is disclosed in Korean Patent No. 10-1156167 (Registered Jun. 7, 2012, Flame Sensing Sensor Used in Gas Turbine and Flame Sensing System Using the Sensor).

Therefore, there is a need to improve this.

The above technical configuration is a background art for helping understanding of the present invention, and does not mean a conventional technology widely known in the technical field to which the present invention belongs.

The present invention has been devised to solve the above problems, and is an optical cable module for virtually reproducing an actual flame state inside a combustor of a gas turbine. If the fiber is provided with a first coupler, the detector-side optical fiber is provided with a second coupler, and it is determined that the combustor-side optical fiber is degraded or has reduced durability, the combustor-side optical cable module It is an object of the present invention to provide a flame sensing optical cable module for a combustor of a gas turbine in which maintenance and repair costs are reduced because only the optical fiber can be separated and replaced.

The present invention provides a flame sensing optical cable module for a combustor of a gas turbine, which is intended to prevent damage due to breakage of the optical fiber extending from the first coupler to the outside by providing a hard protect tube for the combustor-side optical fiber. The purpose is to provide

A flame sensing optical cable module for a combustor of a gas turbine according to the present invention includes: a first optical cable for connecting one side of a first optical fiber having multiple cores to a first connecting portion connected to a combustor of a power plant. unit; a second optical cable unit connecting one side of a second optical fiber having at least the same core as the first optical fiber to a second connecting portion connected to the detector; and generated from the combustor A joint section is included for detachably connecting the first optical fiber and the second optical fiber so that when the first optical fiber adjacent to the flame is damaged, it can be replaced independently.

The joint section includes a first coupler that connects the other side of the first optical fiber with multiple cores; It includes a second coupler that is coupled.

The first coupler includes a first body through which a first communication hole portion passes so as to be open on both sides along the axial direction; and the first body exposed on the other side of the first body. It defines a first mounting hole sized for insertion of an optical fiber and includes a first surface contact pad secured to the other side of said first body.

The first communication holes are characterized in that the first optical fiber is divided into a plurality of cores and has a size and number that allow axial insertion thereof.

The first optical cable unit includes a first flexible tube that wraps and protects the first optical fiber bundle; and at least the first optical fiber bundle or the first It includes a first protection tube which wraps one flexible tube, is made of a rigid material, and prevents the relevant portion of the first optical fiber extending from the first connection portion to the outside from bending.

The first coupler extends from the first surface contact pad along the edge of the first mounting hole and is inserted into the first communication hole portion to circumferentially connect the first optical fiber bundle. It includes a first sleeve adapted to maintain a directional trajectory.

The first body is characterized by forming a first diameter-enlarged hole part whose diameter is enlarged along the axial direction of the first communication hole part in order to insert the first sleeve. and

The second coupler has a second communicating hole portion which is open to both sides along the axial direction so as to allow insertion of the bundle of the second optical fibers from one side to the other side. forming a second body; forming a second mounting hole of a size for forcibly inserting the second optical fiber exposed on the other side of the second body, and fixing it to the other side of the second body; and a second surface contact pad mounted on the peripheral surface of the second body and threadedly coupled to the peripheral surface of the first body to form the first surface contact pad and the second surface contact. The first optical fiber and the second optical fiber are brought into end-to-end contact by mating pads, including a clamping member that guides the transmission of flame light.

The second surface contact pad protrudes and forms a plurality of locating protrusions, and the first surface contact pad accommodates the corresponding locating protrusions to hold the second surface contact pad in place. It includes a locating groove that is recessed for assembly.

INDUSTRIAL APPLICABILITY As described above, the flame sensing optical cable module for a combustor of a gas turbine according to the present invention is an optical cable for virtually reproducing the actual flame state inside the combustor of a gas turbine, unlike the conventional technology. A module comprising a first coupler for the combustor-side optical fiber and a second coupler for the detector-side optical fiber, and it is determined that the combustor-side optical fiber is deteriorated or has reduced durability. In this case, only the combustor-side optical fiber of the optical cable module can be separated and replaced, so maintenance and repair costs can be reduced.

According to the present invention, by providing the combustor-side optical fiber with a hard protect tube, it is possible to prevent the optical fiber extending from the first coupler from being damaged due to breakage.

1 is a front view of a flame sensing optical cable module for a combustor of a gas turbine according to an embodiment of the present invention; FIG. 1 is a perspective view of a joint portion of a flame sensing optical cable module for a combustor of a gas turbine according to an embodiment of the present invention; FIG. 1 is an exploded perspective view of a joint part according to an embodiment of the present invention; FIG. FIG. 4 is a cross-sectional view of a joint before coupling according to an embodiment of the present invention; FIG. 4 is a cross-sectional view of the joint after being assembled according to an embodiment of the present invention; FIG. 5 is a cross-sectional view of a joint after being assembled according to another embodiment of the present invention;

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flame sensing optical cable module for a combustor of a gas turbine according to the present invention will now be described with reference to the accompanying drawings. In this process, the thickness of lines and the sizes of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Also, the terms described below are defined in consideration of the functions of the present invention, and may vary according to the intentions or customs of users and operators. Therefore, definitions of these terms should be based on the overall content of this specification.

FIG. 1 is a front view of a gas turbine combustor flame sensing optical cable module according to an embodiment of the present invention, and FIG. 2 is a gas turbine combustor flame sensing optical cable module according to an embodiment of the present invention. 4 is a perspective view of a joint portion of the optical cable module; FIG.

FIG. 3 is an exploded perspective view of a joint part according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view of the joint part before connection according to one embodiment of the present invention, and FIG. 5 is a cross-sectional view of the joint part after connection according to one embodiment of the present invention.

1 to 5, a flame sensing optical cable module (100) for a combustor (10) of a gas turbine according to an embodiment of the present invention comprises a first optical cable unit (200), a second optical cable unit (300) and joint (400).

The first optical cable unit (200) has the same brightness (Intensity) as the actually generated flame within a predetermined error range, in order to virtually detect the actual flame condition inside the combustor (10) of the power plant. ), and one side is connected to the light-emitting side that emits light. For convenience, the first optical cable unit (200) is hereinafter described as being connected on one side to the combustor (10) side of the power plant.

The first optical cable unit (200) has a first connection (220) on one side to be connected to the combustor (10), the first connection (220) being a multi-core first insert one side of the optical fiber (210). At this time, one side of the first optical fiber (210) is exposed to the outside of the first connecting portion (220) along the axial direction.

Light and flame from the combustor (10) are thereby transmitted along the first optical fiber (210). In particular, the first connection (220) is formed differently.

One side of the second optical cable unit (300) is connected to the detector (20). Therefore, the second optical cable unit (300) plays a role of transmitting the light of the corresponding first optical fiber (210) from the other side along the axial direction to the detector (20) on one side. For this purpose, the second optical cable unit (300) has a second connecting part (320) on one side and is connected to the detecting part (20). The second connection (320) can be variously formed.

The second optical cable unit (300) arranges a plurality of second optical fibers (310).

At this time, the multi-core first optical fiber (210) of the first optical cable unit (200) and the multi-core second optical fiber (310) of the second optical cable unit (300) are in one-to-one correspondence. If the ends are in contact with each other, the reliability of light transmission is ensured.

For this purpose, a joint (400) is provided.

The joint part (400) connects the first optical fiber (210) and the first optical fiber (210) so that when the first optical fiber (210) adjacent to the flame generated from the combustor (10) is damaged, it can be replaced independently. It serves to detachably connect two optical fibers (310).

To this end, the joint part (400) includes a first coupler (500) and a second coupler (600).

The first coupler (500) connects the other side of the multi-core first optical fiber (210), and the second coupler (600) connects the other side of the multi-core second optical fiber (310). concatenate In particular, the first coupler (500) and the second coupler (600) are mated. The first coupler (500) and the second coupler (600) connect the other end of the multi-core first optical fiber (210) and the multi-core first optical fiber (210) at the time of male-female coupling. contact with the other end. Thereby, light (and flame) emanating from the combustor (10) is transmitted through the first optical fiber (210) to the second optical fiber (310).

On the other hand, the first optical cable unit (200) includes a first flexible tube (230) and a first protect tube (240).

A multi-core first optical fiber (210) connects a first connecting portion (220) on one side along the axial direction and connects a first coupler (500) on the other side. Therefore, the core of the first optical fiber (210) is exposed at a portion between the first connector (220) and the first coupler (500). If the exposed portion of the first optical fiber 210 is damaged by being folded or scratched, the light transmission efficiency is reduced.

To prevent this, the core of the first optical fiber (210) between the first connection (220) and the first coupler (500) is bendable (flexible). Surrounded by a first flexible tube (230). Therefore, the first optical fiber (210) is prevented from sharp bending by the first flexible tube (230) and protected from the outside. The first flexible tube (230) may be variously formed, such as a serpentine tube.

And a first protective tube (240) is provided to wrap at least the first optical fiber (210) bundle or the first flexible tube (230) adjacent to the first connection part (220). At this time, the first protection tube (240) is made of a hard material, and prevents the portion of the first optical fiber (210) extending from the first connection portion (220) to be excessively bent. As a result, the first optical fiber (210) on the side of the first connecting portion (220) is not excessively bent in a heat-cured state by the hot air (flame) transmitted from the continuous machine adjacent to the continuous machine side. is prevented from being cut or damaged.

Of course, the first protection tube (240) can be transformed into various shapes and various materials.

The second optical cable unit (300) also includes a second flexible tube (330).

A second optical fiber (310) having multiple cores has a second connecting portion (320) connected to one side along the axial direction and a second coupler (600) connected to the other side. Therefore, the core of the second optical fiber (310) is exposed at a portion between the second connector (320) and the second coupler (600). If the exposed portion of the second optical fiber 310 is damaged by being folded or scratched, the light transmission efficiency is reduced.

To prevent this, the core of the second optical fiber (310) between the second connection (320) and the second coupler (600) is connected to the second flexible tube (330). Surrounded. Therefore, the second optical fiber (310) is prevented from sharp bending by the second flexible tube (330) and protected from the outside. The second flexible tube (330) may be variously formed, such as a serpentine tube.

The first coupler (500), on the other hand, includes a first body (510) and a first surface contact pad (520).

The first body (510) forms the outline of the first coupler (500) and extends along the axial direction to allow insertion of the bundle of first optical fibers (210) from one side to the other. A first communication hole portion (512) is formed so as to open on both sides. At this time, multiple cores of the first optical fiber (210) are simultaneously inserted into the first communication hole (512). The first communication hole part (512) can be variously applied such as a circular cross section or a polygonal shape, and the size and number are not limited.

That is, the first communication hole portion (512) has a size and number that allow axial insertion of the first optical fiber (210) into a plurality of cores. Through this, the process of inserting the first optical fiber 210 into the first communication hole part 512 is more productive than the process of inserting the existing optical fibers into the holes one by one. Instead, the supporting force against the force that tries to bend to the side increases.

Of course, the first body (510) can be deformed into various shapes.

And the first surface contact pad (520) has a first mounting hole ( 522) and is fixed to the other side of the first body (510).

That is, the first body 510 has a first seating groove ( 516) is recessed. Therefore, the first surface contact pad (520) is forcibly inserted into the first seating groove (516). At this time, the central axis of the first communication hole part (512) and the central axis of the first mounting hole (522) are arranged on a straight line, and the first communication hole part (512) and the first contact hole part (512) are aligned. The size and shape of the mounting holes (522) are the same.

Thereby, the bundle of the first optical fibers (210) inserted into the first body (510) through the first communication hole (512) is inserted into the first mounting hole (522) at once. be done. In particular, the other end of the first optical fiber (210) bundle is flush with the surface of the first surface-contact pad (520) or protrudes from the surface of the first surface-contact pad (520). is inserted into the first mounting hole (522).

The second coupler (600) also includes a second body (610), a second surface contact pad (620) and a clamping member (630).

The second body (610) has a second through-hole open to both sides along the axial direction to allow the bundle of the second optical fibers (310) to be inserted from one side to the other side. A communication hole portion (612) is formed.

At this time, multiple cores of the second optical fiber (310) are simultaneously inserted into the second communication hole (612). The second communication hole part (612) can be applied in various ways, such as a circular cross section or a polygonal shape.

That is, the second communication hole portion (612) has a size and number that allow the axial insertion of the second optical fiber (310) into a plurality of cores. Through this, the process of inserting the second optical fiber 310 into the second communication hole part 612 is more productive than the process of inserting the existing optical fibers into the holes one by one. Instead, the supporting force against the force that tries to bend to the side increases.

Also, the second surface contact pad (620) is provided with a second mounting hole ( 622) and is fixed to the other side of the second body (610).

That is, the second body (610) has a second seating groove (620) along the edge of the second communication hole (612) to seat the second surface contact pad (620) on the other side. 614) is recessed. Therefore, the second surface contact pad (620) is forcibly inserted into the second seating groove (614). At this time, the central axis of the second communication hole portion (612) and the central axis of the second mounting hole (622) are arranged on a straight line, and the second communication hole portion (612) and the second connection hole portion (612) are aligned. The size and shape of the mounting holes (622) are the same.

As a result, a plurality of bundles of the second optical fibers (310) inserted into the second body (610) through the second communication hole portions (612) are inserted into the corresponding second mounting holes (622). ). In particular, the other end of the second optical fiber (310) bundle is flush with the surface of the second surface contact pad (620) or protrudes from the surface of the second surface contact pad (620). is inserted into the second mounting hole (622).

Also, the clamping member (630) is threadedly coupled to the peripheral surface of the first body (510) while being provided on the peripheral surface of the second body (610) to provide a first surface contact pad (520) and a first contact pad (520). The first optical fiber (210) and the second optical fiber (310) are in end-to-end contact by contacting two surface contact pads (620) to guide the transmission of flame light. play a role.

Specifically, the first body (510) defines a first thread (518) on its outer surface and the fastening member (630) defines a second thread (632) on its inner surface.

At the same time, the second body (610) has body locking jaws (616) protruding outward on its peripheral surface, and the tightening member (630) forms a tightening locking jaw (634) protruding inward.

Also, on the outer peripheral surface of the second body (610), a resilient support member (618) is disposed between the body locking jaw (616) and the clamping locking jaw (634). Thus, the elastic support member (618) is elastically supported on one side by the tightening locking jaw (634) and on the other side by the body locking jaw (616) along the axial direction.

Thus, when first thread (518) and second thread (642) are threadedly coupled, second body (610) and first body (510) are threaded together in opposing cross-sections. In close contact. At the same time, the first surface contact pad (520) and the second surface contact pad (620) are in close contact, and the bundle of the first optical fiber (210) and the bundle of the second optical fiber (310) are brought into contact. come into contact.

At this time, the elastic support member (618) is compressed and the clamping member (618) is compressed so that the first bundle of optical fibers (210) and the second bundle of optical fibers (310) do not excessively touch corresponding ends. Allows a predetermined axial movement of the second body (610) relative to (630). This reduces the contact force between the corresponding ends of the first bundle of optical fibers (210) and the second bundle of optical fibers (310).

In addition, when the first thread (518) and the second thread (642) are screwed together, the second body (610) is pushed to the other side by the elastic restoring force of the elastic support member (618). Forces tending to move excessively can act. Then, when the threaded connection between the first thread (518) and the second thread (642) is released by an external operation, the tightening member (630) moves toward one side of the second body (610). can leave.

So, the second body (610) is provided with a stopper ring (640) on one peripheral surface. A second body (610) is pivoted into a stopper ring (640). After the fixing pin (642) is inserted into the stopper ring (640), the peripheral surface of the second body (610) is pressed. Thereby, the stopper ring (640) supports one side of the tightening member (630) while being fixed to the second body (610), and by supporting one side of the tightening member (630), the second body (610) is supported. body (610) from moving too far to the other side.

Of course, the stopper ring (640) can be deformed into various shapes.

The second surface contact pad (620) has a plurality of positioning projections (624), and the first surface contact pad (520) has positioning grooves (524) that accommodate the positioning projections (624) one by one. ).

Thus, by inserting the positioning projections (624) into the corresponding positioning grooves (524), the first surface contact pad (520) is set in the assembly orientation, allowing for fixed position assembly.

As a result, each core of the first optical fiber (210) and each core of the second optical fiber (310) are relatively aligned.

FIG. 6 is a cross-sectional view of a joint after being assembled according to another embodiment of the present invention.

Referring to FIG. 6, a flame sensing optical cable module (100) for a gas turbine combustor (10) according to another embodiment of the present invention comprises a first optical cable unit (200), a second optical cable unit (300). ) and the joint part (400).

The first optical cable unit (200) and the second optical cable unit (300) replace the above.

And the joint part (400) includes a first coupler (500) and a second coupler (600).

A second coupler (600) replaces the foregoing.

The first coupler (500) includes a first body (510), a first surface contact pad (520) and a first sleeve (530).

The first body (510) and the first surface contact pad (520) replace those previously described.

And the first sleeve (530) extends from the first surface contact pad (520) along the edge of the first mounting hole (522) and is inserted into the first communication hole portion (512) to form the first It serves to maintain the circumferential trajectory of one optical fiber (210) bundle.

In particular, the first sleeve (530) is sized to force-fit the bundle of the first optical fibers (210) and by increasing the contact area with the bundle of the first optical fibers (210), Prevent axial pressing of the first optical fiber (210) against the first surface contact pad (520).

At this time, the first body (510) has a first expansion part whose diameter is partially expanded along the axial direction of the first communication hole part (512) in order to insert the first sleeve (530). A diameter hole portion (514) is formed. That is, the first enlarged diameter hole portion (514) is formed by expanding the diameter to the other side of the first communication hole portion (512) along the axial direction of the first body (510). The first sleeve (530) is then forcefully inserted into the first enlarged diameter hole portion (514). The diameter of the hole of the first sleeve (530), the diameter of the first communication hole part (512) and the diameter of the first mounting hole (522) are the same.

This allows the bundles of the first optical fibers (210) to be arranged relatively uniformly inside the hole of the first sleeve (530) and inside the first mounting hole (522).

The drawing numbers not explained are replaced with those mentioned above.

Although the present invention has been described with reference to the embodiments shown in the drawings, which are illustrative only, a person of ordinary skill in the art will find that various further modifications can be made. It will be appreciated that other variations and equivalent implementations are possible. Therefore, the true technical scope of protection of the present invention should be determined by the following claims.

10: Combustor 20: Detector 100: Optical Cable Module 200: First Optical Cable Unit 210: First Optical Fiber 300: Second Optical Cable Unit 310: Second Optical Fiber 400: Joint Section 500: First Coupler 510: first body 520: first surface contact pad 530: first sleeve 600: second coupler 610: second body 620: second surface contact pad 622: second mounting hole 624: position Setting Protrusion 630: Clamping Member 634: Clamping Locking Jaw 640: Stopper Ring

Claims (6)

a first optical cable unit that connects one side of a multi-core first optical fiber to a first connection part that is connected to a combustor of a power plant; a second optical cable unit that connects one side of a second optical fiber having at least the same core as the optical fiber of the above; a joint section that detachably couples the first optical fiber and the second optical fiber so as to be possible,
The joint section includes a first coupler that connects the other side of the first optical fiber with multiple cores; including a second coupler that is female coupled;
The first coupler includes a first body passing through a first communication hole portion so as to be open on both sides along the axial direction; and the first body exposed on the other side of the first body. a first surface contact pad fixed to the other side of said first body defining a first mounting hole sized for insertion of an optical fiber;
The optical cable module for flame sensing of a combustor of a gas turbine, wherein the first communication hole portion has a size and number that allow axial insertion of the first optical fiber into a plurality of cores. The first optical cable unit includes: a first flexible tube that wraps and protects the first optical fiber bundle; and at least the first optical fiber bundle or the first 1. The optical fiber according to claim 1, further comprising: a first protection tube that wraps around one flexible tube, is made of a hard material, and prevents the portion of the first optical fiber that extends from the first connecting portion to the outside from bending. 2. An optical cable module for flame sensing of a combustor of a gas turbine according to claim 1. The first coupler extends from the first surface contact pad along the edge of the first mounting hole and is inserted into the first communication hole portion to circumferentially connect the first optical fiber bundle. 2. The gas turbine combustor flame sensing optical cable module of claim 1, including a first sleeve adapted to maintain a directional trajectory. The first body is characterized by forming a first diameter-enlarged hole part whose diameter is enlarged along the axial direction of the first communication hole part in order to insert the first sleeve. The optical cable module for flame sensing of combustors of gas turbines according to claim 3, wherein: The second coupler is
a second body having a second communication hole opening to both sides along the axial direction to allow insertion of the second optical fiber bundle from one side to the other side;
A second surface contact fixed to the other side of the second body, forming a second mounting hole having a size for forcibly inserting the second optical fiber exposed on the other side of the second body. pad;
It is screw-coupled to the peripheral surface of the first body while being provided on the peripheral surface of the second body, and the first surface-contact pad and the second surface-contact pad are brought into close contact with each other, whereby the second Gas according to any one of claims 1 to 4, characterized in that one optical fiber and said second optical fiber are in end-to-end contact and comprise a clamping member for guiding the transmission of flame light. Optical cable module for flame sensing in turbine combustors. the second surface contact pad has a plurality of positioning protrusions;
The first surface contact pad includes a locating groove recessed to assemble the second surface contact pad in place by receiving a corresponding locating protrusion. Item 6. An optical cable module for detecting a flame of a gas turbine combustor according to item 5.

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