JP2024041554A - Penetration structure of optical fiber sensor and gasification device - Google Patents

Abstract

An object of the present invention is to provide a penetration structure for an optical fiber sensor and a gasification device in which an optical fiber can be easily installed and replaced.
A penetration structure for an optical fiber sensor that penetrates a partition wall that partitions a first space and a second space whose interior temperature is higher than that of the first space, wherein the optical fiber sensor is inserted into a through hole that penetrates the partition wall. an optical fiber connector having a connection portion to which one end of the at least one optical fiber is connected; a metal seal tube through which the at least one optical fiber is inserted; a joint member configured to removably support a metal seal tube inserted into the insertion hole, the insertion hole of the joint member having a size that allows the optical fiber connector to be inserted therethrough; was formed.
[Selection diagram] Figure 1

Description

The present disclosure relates to a penetrating structure for an optical fiber sensor and a gasification device including the penetrating structure for the optical fiber sensor.

BACKGROUND ART A gasification apparatus having a dual structure including a gasification furnace configured to gasify carbon-containing solid fuel and a pressure vessel covering the gasification furnace is known (see Patent Document 1). Conventionally, a chordal thermocouple is sometimes installed inside the pressure vessel wall in order to evaluate temperature fluctuations in the furnace wall tube that forms part of the furnace wall that partitions the inside and outside of the gasifier. Appropriately understanding temperature fluctuations throughout the gasifier is important for stable operation, but installing a large number of chordal thermocouples is not realistic due to installation time, cost, and restrictions on the maximum number of ports. do not have.

JP 2017-110152 Publication

For multi-point measurement, an optical fiber sensor capable of multi-point measurement using a single optical fiber is preferable to the chordal thermocouple described above. However, in order to provide an optical fiber sensor for measuring the furnace wall, a penetrating structure for the optical fiber sensor is required to take out the optical fiber from inside the relatively high temperature and high pressure pressure vessel while ensuring airtightness. And fiber optic sensors are relatively easy to damage. Therefore, the penetrating structure of the optical fiber sensor is desired to have a structure in which an optical fiber can be easily installed, and a structure in which the optical fiber can be easily replaced when the optical fiber is damaged.

In view of the above-mentioned circumstances, it is an object of at least one embodiment of the present disclosure to provide an optical fiber sensor penetration structure and a gasification device that allow easy installation and replacement of optical fibers.

A penetrating structure of an optical fiber sensor according to an embodiment of the present disclosure includes:
A penetrating structure for an optical fiber sensor that penetrates a partition wall that partitions a first space and a second space whose interior temperature is higher than the first space,
at least one optical fiber inserted into a through hole penetrating the partition;
a metal seal tube through which the at least one optical fiber is inserted;
an optical fiber connector having a connection portion to which one end of the at least one optical fiber is connected;
a joint member having an insertion hole through which the metal seal tube is inserted, and configured to detachably support the metal seal tube inserted into the insertion hole,
The insertion hole of the coupling member is formed in a size that allows the optical fiber connector to be inserted therethrough.

A gasifier according to an embodiment of the present disclosure includes:
A gasifier configured to partially burn and gasify carbon-containing solid fuel,
A penetrating structure of the optical fiber sensor,
The gasification furnace is provided with the partition wall that partitions the second space formed inside the pressure vessel and the first space formed outside the pressure vessel.

According to at least one embodiment of the present disclosure, there is provided an optical fiber sensor penetration structure and a gasification device that allow easy installation and replacement of optical fibers.

1 is a schematic cross-sectional view of a penetrating structure of an optical fiber sensor according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view along the longitudinal direction of a metal seal tube according to an embodiment of the present disclosure. FIG. 3 is a schematic cross-sectional view of a penetrating structure of an optical fiber sensor according to a comparative example. 1 is a schematic cross-sectional view of a penetrating structure of an optical fiber sensor according to an embodiment of the present disclosure. 1 is a schematic cross-sectional view of a penetrating structure of an optical fiber sensor according to an embodiment of the present disclosure. 1 is a schematic cross-sectional view of a penetrating structure of an optical fiber sensor according to an embodiment of the present disclosure. 1 is a schematic cross-sectional view of a through structure of an optical fiber sensor according to an embodiment of the present disclosure. 1 is a schematic cross-sectional view of a penetrating structure of an optical fiber sensor according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view along the longitudinal direction of a metal seal tube according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view along the longitudinal direction of a metal seal tube according to an embodiment of the present disclosure. FIG. 1 is a schematic cross-sectional view along the longitudinal direction of a metal seal tube according to an embodiment of the present disclosure. 12 is a schematic sectional view showing a cross section perpendicular to the longitudinal direction of the metal seal tube shown in FIG. 11. FIG. 1 is a schematic cross-sectional view of a gasifier according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, and are merely illustrative examples. do not have.

(Optical fiber sensor penetration structure)
Each of FIGS. 1 and 4 to 8 is a schematic cross-sectional view of a penetrating structure 1 of an optical fiber sensor according to an embodiment of the present disclosure. As shown in FIGS. 1 and 4 to 8, the penetration structure 1 of the optical fiber sensor according to some embodiments includes a first space 21 and a second space 22 whose internal temperature is higher than the first space 21. It penetrates the partition wall 23 that partitions the space. The second space 22 also has a higher internal pressure than the first space 21 .

(bulkhead)
In the illustrated embodiment, the partition wall 23 described above includes a pressure vessel wall that partitions a second space 22 formed inside the pressure vessel 2 and a first space 21 formed outside the pressure vessel 2. The pressure vessel 2 has a second space 22 formed therein by an inner surface of a partition wall 23 (pressure vessel wall). A first space 21 is formed outside the pressure vessel 2 with a partition wall 23 interposed between the first space 21 and the second space 22 . In the illustrated embodiment, a gasification furnace 20 (see FIG. 13) is installed inside the pressure vessel 2. This gasifier 20 is configured to partially combust and gasify the carbon-containing solid fuel (for example, coal) introduced into the gasifier 20 . By driving the gasifier 20 and partially burning the carbon-containing solid fuel, the inside of the gasifier 20 becomes high temperature, and the gasifier wall 28 (see FIG. 13) that partitions the outside and the inside of the gasifier 20 is heated. Due to the heat, the temperature inside the second space 22 becomes higher than the temperature inside the first space 21 . Further, the pressure inside the second space 22 is maintained higher than the pressure inside the first space 21. Note that the pressure vessel 2 of the present disclosure only needs to have a partition wall 23 (pressure vessel wall) that partitions the first space 21 and the second space 22, and the gasifier 20 is not installed inside the pressure vessel 2. It is also applicable to cases where

In one embodiment, the temperature inside the second space 22 is as high as 300° C. or higher. The pressure inside the second space 22 is a high pressure of 1 MPa or more. The temperature inside the first space 21 is normal temperature (atmospheric temperature), and the pressure inside the first space 21 is normal pressure (atmospheric pressure). Note that the partition wall 23 of the present disclosure may be any partition wall that partitions the first space 21 and the second space 22. The partition wall 23 may be a partition wall or the like that partitions the inside and outside of a storage device (for example, a storage tank) in which a second space 22 for storing relatively high temperature and high pressure fluid is formed.

In the illustrated embodiment, the partition wall 23 includes a partition main body 231 that partitions between the first space 21 and the second space 22, and a partition wall main body 231 that partitions the partition wall main body 231 from the partition wall main body 231 to the first space, as shown in FIGS. A cylindrical protrusion 232 that protrudes toward the 21 side and forms the through hole 24 with its inner surface, and a cylindrical protrusion 232 that protrudes from the tip of the protrusion 232 (the end on the first space 21 side) to the outer circumferential side (radially outer side of the protrusion 232 ), and a plate-shaped sealing member 25 that is fastened to the flange part 233 via a fastening member 26 and seals the through hole 24. The partition wall 23 may further include a heat insulating material 27 attached to the outer surface (the surface facing the first space 21) of the partition main body 231. In the illustrated embodiment, the heat insulating material 27 is disposed in the first space 21 and covers the protrusion 232, the flange 233, the fastening member 26, and the sealing member 25. The heat insulating material 27 can reduce heat transfer from the second space 22 to the first space 21 via the partition main body 231.

In the illustrated embodiment, the fastening member 26 is screwed into a bolt 26A that is inserted through a through hole 234 formed in the flange portion 233 and a through hole 251 formed in the outer circumference of the sealing member 25. , a nut 26B that clamps the flange portion 233 and the outer circumferential portion of the sealing member 25 between the bolt 26A. The sealing member 25 is made of an annular plate in which a center hole (through hole) 252 having a smaller hole diameter than the through hole 24 is formed. The first space 21 and the second space 22 communicate with each other via the through hole 24 and the center hole 252 of the sealing member 25 .

As shown in FIGS. 1 and 4 to 8, the penetration structure 1 of the optical fiber sensor includes at least one optical fiber 3 inserted into a through hole 24 passing through a partition 23, and at least one optical fiber. 3, and an optical fiber connector 5 having a connecting portion (first connecting portion) 51 to which one end of at least one optical fiber 3 is connected.

(optical fiber, optical fiber sensor)
The optical fiber 3 is a transmission path for transmitting an optical signal. The optical fiber 3 has a concentric structure in which a core with a relatively high refractive index is covered with a cladding with a relatively low refractive index, and light (optical signal) is propagated while being confined inside the core. The optical fiber 3 is made of a thin fibrous material formed of silica glass, fluoride glass, chalcogenide glass, plastic, or the like.

The optical fiber 3 is inserted through the through hole 24 and the center hole 252 of the sealing member 25. A sensing section 31 is provided on one side (second space 22 side) of the optical fiber 3 in the longitudinal direction. The sensing unit 31 acquires the state of the second space 22 (measurement environment) by utilizing the property that light changes depending on the state of the second space 22 (measurement environment) in which the sensing unit 31 is arranged. It has become. The sensing section 31 may be a detection element (FBG) present in the core of the optical fiber 3, or may be configured integrally with the optical fiber 3. Further, the sensing unit 31 may be separate from the optical fiber 3 and may be detachably connected to the end portion of the optical fiber 3 on one side (the second space 22 side) in the longitudinal direction.

The end 32 of the optical fiber 3 on the other side in the longitudinal direction (first space 21 side) is connected to the first connection portion 51 of the optical fiber connector 5 . The optical fiber sensor includes an optical fiber 3 including a sensing section 31 and a measuring instrument 10 configured to be able to transmit and receive optical signals. The measuring instrument 10 includes a light emitting section (light source) 101 and a light receiving section (light receiving element) 102. In the illustrated embodiment, the optical fiber sensor includes the above-described optical fiber connector 5 and a relay optical fiber whose one end is connected to the second connection part 52 of the optical fiber connector 5 and whose other end is connected to the measuring instrument 10. 11. Note that the optical fiber connector 5 may be connected to the measuring instrument 10, and in this case, the optical fiber sensor does not need to include the relay optical fiber 11.

Light emitted from the irradiation section 101 is guided to the sensing section 31 via the relay optical fiber 11, the optical fiber connector 5, and the optical fiber 3. The light guided to the sensing section 31 changes according to changes in the state of the second space 22 (measurement environment). Reflected light that changes from the sensing section 31 according to changes in the state of the second space 22 (measurement environment) is guided to the light receiving section 102 via the optical fiber 3, the optical fiber connector 5, and the relay optical fiber 11. The measuring instrument 10 detects a change in the state of the second space 22 (measurement environment) in which the sensing unit 31 is arranged (for example, at least one of a strain change or a temperature change) using reflections guided from the sensing unit 31 to the light receiving unit 102. It is detected as a change in light (for example, a change in the wavelength of reflected light).

(metal seal tube)
The metal seal tube 4 is made of a metal material and has a cylindrical shape having an outer surface 41 and an inner surface 42 . The inner surface 42 of the metal seal tube 4 forms an insertion hole through which at least one optical fiber 3 is loosely inserted, and there is a gap 43 between the inner surface 42 of the metal seal tube 4 and the outer surface of the optical fiber 3. is formed. The optical fiber 3 has an insertion portion 33 that is inserted into the metal seal tube 4 between the sensing portion 31 and the end portion 32 on the other side (first space 21 side). In the illustrated embodiment, the metal seal tube 4 is formed into a cylindrical shape in which the outer surface 41 and the inner surface 42 have circular contours in a cross section perpendicular to the longitudinal direction of the metal seal tube 4 (FIG. 12). reference).

FIG. 2 is a schematic cross-sectional view along the longitudinal direction of the metal seal tube 4 according to an embodiment of the present disclosure. In some embodiments, as shown in FIG. 2, a seal member 43A is disposed inside the metal seal tube 4, filling the above-mentioned gap 43 and sealing the inside of the metal seal tube 4. . The sealing member 43A is adapted to abut on the inner surface 42 of the metal seal tube 4 and also on the outer surface of the optical fiber 3. The seal member 43A is made of metal, ceramic, or resin material that can be used at high temperatures of 300° C. or higher. By sealing the insertion hole of the metal seal tube 4 with the sealing member 43A, the flow (leakage) of fluid through the insertion hole of the metal seal tube 4 can be suppressed.

(Joint member)
The optical fiber sensor penetrating structure 1 further includes a joint member 6, as shown in FIGS. 1 and 4 to 8. The joint member 6 has insertion holes 63 and 64 through which the metal seal tube 4 is inserted, and is configured to detachably support the metal seal tube 4 inserted into the insertion holes 63 and 64. The insertion hole 63 and the insertion hole 64 of the coupling member 6 are formed in a size that allows the optical fiber connector 5 to be inserted therethrough. Further, the insertion hole 63 and the insertion hole 64 of the joint member 6 are formed in a size that allows the sensing portion 31 to be inserted therethrough.

When supporting the metal seal tube 4 inserted into the insertion holes 63 and 64, the joint member 6 seals between at least one of the insertion holes 63 and 64 and the outer surface 41 of the metal seal tube 4. is configured to do so. By sealing at least one of the insertion holes 63 and 64 with the coupling member 6, fluid circulation (leakage) through the insertion holes 63 and 64 can be suppressed.

(Joint member according to comparative example)
FIG. 3 is a schematic cross-sectional view of a penetration structure 01 of an optical fiber sensor according to a comparative example. As shown in FIG. 3, the penetration structure 01 of the optical fiber sensor according to the comparative example includes the above-mentioned at least one optical fiber 3, the above-mentioned metal seal tube 4, the above-mentioned optical fiber connector 5, and a joint member. 06. The joint member 06 includes a joint body 061 having an insertion hole 063 through which the optical fiber 3 is inserted, and a nut member 62 having an insertion hole 64 through which the metal seal tube 4 is inserted. The insertion hole 063 of the joint body 061 is not formed in a size that allows the metal seal tube 4 and the optical fiber connector 5 to be inserted therethrough.

In the optical fiber sensor penetration structure 01 according to the comparative example, there is a possibility that the installation work (new installation work) of the optical fiber 3 or the replacement work of the optical fiber 3 when the optical fiber 3 is damaged may become difficult. Specifically, when installing or replacing the optical fiber 3, the single optical fiber 3, which is not attached to the metal seal tube 4 or the optical fiber connector 5, is inserted through the insertion holes 063 and 64 of the coupling member 06. Later, it will be necessary to attach it to the metal seal tube 4 and the optical fiber connector 5. When attaching the optical fiber 3 to the metal seal tube 4, it is also necessary to fill the space between the optical fiber 3 and the metal seal tube 4 with a sealing member 43A.

According to the above configuration, the penetration structure 1 of the optical fiber sensor allows at least one optical fiber 3 inserted into the through hole 24 passing through the partition wall 23 to move the relatively high temperature second space 22 to the relatively low temperature. The optical signal (reflected light) transmitted by the optical fiber 3 into the first space 21 can be extracted. The penetration structure 1 of the optical fiber sensor can suppress fluid flow (leakage) between the first space 21 and the second space 22 via the penetration hole 24 by the metal seal tube 4 and the joint member 6.

Further, according to the above configuration, the penetration structure 1 of the optical fiber sensor is formed by forming the penetration holes 63 and 64 of the joint member 6 to a size that allows the metal seal tube 4 and the optical fiber connector 5 to be inserted therethrough. The metal seal tube 4 to which the optical fiber 3 is attached and the optical fiber connector 5 can be passed through the insertion holes 63 and 64. In this case, as in the penetration structure 01 of the optical fiber sensor according to the comparative example, the single optical fiber 3, which is not attached to the metal seal tube 4 or the optical fiber connector 5, is inserted into the penetration holes 063, 64 of the coupling member 06. There is no need to attach it to the metal seal tube 4 or the optical fiber connector 5 after inserting it. In such a penetrating structure 1 of an optical fiber sensor, the optical fiber 3 can be easily installed (newly installed), and the optical fiber 3 can be easily replaced when the optical fiber 3 is damaged.

(Joint body, nut material)
1 and 4 to 8, in some embodiments, the joint member 6 includes at least a joint body 61 having a first insertion hole 63 through which the metal seal pipe 4 is inserted, and a nut member 62 having a second insertion hole 64 through which the metal seal pipe 4 is inserted and a screw portion 66 that screws into the joint body 61. The joint body 61 has a screw portion 65 that screws into the screw portion 66 of the nut member 62. Each of the joint body 61 and the nut member 62 is formed from a metal material.

The joint body 61 is formed into a cylindrical shape having a longitudinal direction along the extending direction of the first insertion hole 63 formed by the inner surface thereof. The nut member 62 is formed into a cylindrical shape having a longitudinal direction along the extending direction of the second insertion hole 64 formed by the inner surface thereof.

In the illustrated embodiment, a screw portion (thread portion) 65 is formed on the outer surface of the end (one end) of the joint body 61 on the side farther from the through hole 24 in the longitudinal direction. A screw portion (thread portion) 66 is formed on the inner surface of the end (one end) of the nut member 62 on the through hole 24 side in the longitudinal direction. By screwing the screw portion 66 of the nut member 62 into the screw portion 65 of the joint body 61, a biasing force toward the inner periphery (inner side in the radial direction of the joint member 6) generated at the one end where the screw portion 65 of the joint body 61 is formed presses the inner surface of the one end of the joint body 61 against the outer surface of the metal seal pipe 4. This seals the space between the joint body 61 and the metal seal pipe 4.

The above-mentioned joint member 6 has an inner surface of at least one of the joint body 61 or the nut member 62 due to the biasing force generated by the screwing of the threaded part 65 of the joint body 61 and the threaded part 66 of the nut member 62. It may further include a seal member (not shown) that seals between the outer surface of the metal seal tube 4 and the outer surface of the metal seal tube 4. This sealing member (not shown) may be made of a resin material.

According to the above configuration, by screwing the threaded portion 66 of the nut member 62 into the joint body 61, the metal seal tube 4 inserted into the first insertion hole 63 and the second insertion hole 64 can be connected to the joint member 6. I can support it. Moreover, by releasing the threaded engagement between the joint body 61 and the nut member 62, the metal seal tube 4 can be easily removed from the joint member 6. The penetration structure 1 of the optical fiber sensor including such a joint member 6 allows the optical fiber 3 to be easily installed (newly installed), and also allows the optical fiber 3 to be easily replaced when the optical fiber 3 is damaged. be.

(Fixing of joint members)
In some embodiments, as shown in FIGS. 1 and 4 to 6, the joint main body 61 described above is arranged in the first space 21, and One end (the end on the through-hole 24 side) in the direction of movement) is connected to the partition wall 23 .

In the illustrated embodiment, the metal seal tube 4 is inserted through the insertion holes 63 and 64 of the coupling member 6 and the center hole 252 of the sealing member 25 described above. The above-mentioned heat insulating material 27 has an insertion hole formed therein for loosely inserting the joint member 6 therethrough. A threaded portion (threaded portion) 253 is formed on the inner surface of the sealing member 25 forming the center hole 252 at least in a portion in the penetrating direction of the center hole 252 . A threaded part (threaded part) 67 that threads into the threaded part (threaded part) 253 is formed on the outer surface of the end of the joint body 61 on the side of the through hole 24 . The threaded portion 67 of the joint body 61 is threaded into the threaded portion 253 of the sealing member 25 .

The joint body 61 has a welded portion W1 in which the inner peripheral edge (edge of the center hole 252) of the surface of the sealing member 25 on the first space 21 side is welded in the circumferential direction to the outer surface of the joint body 61. The end of the joint body 61 on the through hole 24 side is fixed to the sealing member 25 (partition wall 23) by the weld W1.

According to the above configuration, the joint member 6 can be fixed to the partition wall 23 by connecting one end of the joint body 61 (the end on the through hole 24 side) to the partition wall 23 . By arranging the joint body 61 in the relatively low-temperature first space 21, heat input from the outside to the joint member 6 and the metal seal tube 4 is reduced compared to when the joint body 61 is placed in the relatively high-temperature second space 22. Therefore, damage to the joint member 6 and the metal seal tube 4 due to heat can be suppressed.

(metal extension tube)
In some embodiments, as shown in FIGS. 7 and 8, the above-described optical fiber sensor penetration structure 1 is arranged in the first space 21 and extends in the extending direction of the first insertion hole 63 of the joint body 61. One end 71 (end on the through hole 24 side) is connected to one end (end on the through hole 24 side) of the partition wall 23 , and the other end 72 (end on the side away from the through hole 24 ) It further includes a connected metal extension tube 7.

The metal extension tube 7 is formed into a cylindrical shape with an inner surface sized to allow the metal seal tube 4 and the optical fiber connector 5 to be inserted therethrough. In the illustrated embodiment, the metal seal tube 4 is inserted into the insertion holes 63 and 64 of the coupling member 6 described above, and the end of the metal seal tube 4 on the through hole 24 side is inserted into the metal extension tube 7. ing. The above-mentioned heat insulating material 27 has an insertion hole formed therein for loosely inserting the metal extension tube 7 therethrough.

In the illustrated embodiment, the metal extension tube 7 includes a first metal extension tube 7A including the above-described one end 71, and an end portion of the first metal extension tube 7A on the side away from the through hole 24, and a metal extension tube 7A on the through hole 24 side. and a second metal extension tube 7B to which the ends of the metal extension tube 7B are connected and include the other end 72 described above. The outer surface and inner surface are larger than that of the second metal extension tube 7B.

A threaded portion (threaded portion) 253 is formed on the inner surface of the sealing member 25 forming the center hole 252 at least in a portion in the penetrating direction of the center hole 252 . On the outer surface of one end 71 (end on the through hole 24 side) of the first metal extension tube 7A (metal extension tube 7), there is a threaded part (threaded part) 73 that threads into the threaded part (threaded part) 253. It is formed. The threaded portion 73 of the first metal extension tube 7A is threaded into the threaded portion 253 of the sealing member 25. The first metal extension tube 7A has a welded portion W6 where the inner peripheral edge (edge of the center hole 252) of the surface of the sealing member 25 on the first space 21 side is circumferentially welded to the outer surface of the first metal extension tube 7A. . The end of the first metal extension tube 7A on the through hole 24 side is fixed to the sealing member 25 (partition wall 23) by the weld W6.

A threaded portion (threaded portion) 74 is formed on the outer surface of the end of the first metal extension tube 7A on the side away from the through hole 24. A threaded portion (threaded portion) 75 that threads into the threaded portion 74 is formed on the inner surface of the end of the second metal extension tube 7B on the through hole 24 side. A threaded portion 75 of the second metal extension tube 7B is screwed into a threaded portion 74 of the first metal extension tube 7A. The first metal extension tube 7A has a welded portion W7 on the outer surface of the first metal extension tube 7A, where the end surface of the second metal extension tube 7B on the through hole 24 side is welded in the circumferential direction. The end of the first metal extension tube 7A on the side away from the through hole 24 is fixed to the end of the second metal extension tube 7B on the side of the through hole 24 by the weld W7.

A threaded portion (threaded portion) 76 is formed on the inner surface of the other end 72 (the end on the side away from the through hole 24) of the second metal extension tube 7B. A threaded part (threaded part) 67A that threads into the threaded part 76 is formed on the outer surface of the end of the joint body 61 on the through hole 24 side. The threaded portion 67A of the joint body 61 is screwed into the threaded portion 76 of the second metal extension tube 7B. The joint body 61 has a welded portion W8 on the outer surface of the joint body 61, in which the end face of the second metal extension tube 7B on the side away from the through hole 24 is welded in the circumferential direction. The end of the joint body 61 on the through hole 24 side is fixed to the end of the second metal extension tube 7B on the side away from the through hole 24 by the weld W8. As described above, the end of the joint body 61 on the through hole 24 side is fixed to the sealing member 25 (partition wall 23) via the metal extension tube 7 (first metal extension tube 7A and second metal extension tube 7B). There is. Note that in another embodiment, the metal extension tube 7 does not include a plurality of metal extension tubes 7A, 7B with different sizes of the outer and inner surfaces, but is a single tube whose outer and inner surfaces are constant in size in the longitudinal direction. It may consist of a metal extension tube.

According to the above configuration, the joint member 6 can be fixed to the partition wall 23 by connecting one end of the joint body 61 to the partition wall 23 via the metal extension tube 7 . By connecting the joint body 61 to the partition wall 23 via the metal extension pipe 7, heat input from the outside to the joint member 6 and the metal seal pipe 4 is suppressed compared to the case where the joint body 61 is connected directly to the partition wall 23. Therefore, damage to the joint member 6 and the metal seal tube 4 due to heat can be suppressed.

By including the metal extension tube 7 in the optical fiber sensor penetration structure 1, the distance L between the sealing member 25 (partition wall 23) and the metal seal tube 4 can be increased. The temperature of the fluid guided to the metal seal tube 4 due to heat radiation from the inside of the metal extension tube 7 to the outside is lower than the temperature inside the second space 22 . The metal extension tube 7 is set such that the distance L is such that the temperature of the seal member 43A that seals the inside of the metal seal tube 4 can be maintained below the heat-resistant temperature of the seal member 43A.

In one embodiment, the temperature inside the second space 22 is as high as 300° C. or higher. The pressure inside the second space 22 is a high pressure of 1 MPa or more. The temperature inside the first space 21 is normal temperature (atmospheric temperature), and the pressure inside the first space 21 is normal pressure (atmospheric pressure). The outer surface size (outer diameter) of the metal extension tube 7 is 0.5 inch or more and 1 inch or less. In this case, if the distance L is 0.2 m or more, the temperature of the sealing member 43A can be maintained below the heat-resistant temperature. Note that the above-mentioned distance L can be shortened by arranging a constriction part or the like inside the metal extension tube 7 to inhibit the flow of fluid (high temperature gas).

(Relay connector)
In some embodiments, the above-described optical fiber sensor penetration structure 1 is arranged inside a metal extension tube 7, as shown in FIG. 8, and is a relay for detachably connecting at least one optical fiber 3. It further includes a connector 13.

The relay connector 13 includes a first connection part 131 to which the optical fiber 3 is detachably connected, and a second connection to which an optical fiber 3 different from the optical fiber 3 connected to the first connection part 131 is detachably connected. 132. The relay connector 13 is configured to transmit light between the optical fiber 3 connected to the first connection part 131 and the optical fiber 3 connected to the second connection part 132. Each of the optical fibers 3 includes a first optical fiber 3A having one end connected to the first connection part 131 and a second optical fiber 3B having one end connected to the second connection part 132. The first optical fiber 3A is provided with the above-mentioned sensing section 31. The other end of the second optical fiber 3B is connected to the first connection portion 51 of the optical fiber connector 5.

According to the above configuration, the temperature inside the metal extension tube 7 becomes lower than the temperature inside the second space 22 due to heat radiation from the inside of the metal extension tube 7 to the outside (the first space 21 ). By lowering the temperature inside the metal extension tube 7 than the heat resistance temperature of the relay connector 13 (specifically, the heat resistance temperature of the adhesive used for bonding inside the relay connector 13), It becomes possible to arrange the relay connector 13. By arranging the relay connector 13 inside the metal extension tube 7, the optical fiber 3 can be removed even if an abnormality such as a disconnection or signal abnormality occurs in at least one optical fiber 3 connected to the relay connector 13. Easily replaceable. When an abnormality occurs in one of the first optical fiber 3A or the second optical fiber 3B, the one optical fiber (3A or 3B) in which the abnormality occurs may be replaced.

Note that, in order to promote heat dissipation from the inside of the metal extension tube 7 to the outside, a heat radiation fin (not shown) is arranged in the first space 21 and connected to the outer surface of the metal extension tube 7. It's okay.

(cladding tube)
In some embodiments, the optical fiber sensor penetration structure 1 described above has one end 81 connected to the metal seal tube 4, and the axial direction of at least one optical fiber 3, as shown in FIGS. 4 to 8. It further includes a cladding tube 8 that covers at least a portion in the (longitudinal direction). The cladding tube 8 is formed into a bellows tube shape having peaks 82 and valleys 83 extending along the circumferential direction of the cladding tube 8 alternately along the axial direction (longitudinal direction) of the cladding tube 8, and is flexible. be. The cladding tube 8 is formed in a size that can be inserted into the insertion holes 63 and 64 of the coupling member 6. That is, the outer diameter (maximum diameter) of the cladding tube 8 is smaller than the hole diameters of the insertion holes 63 and 64.

In the illustrated embodiment, the cladding tube 8 includes a first cladding tube 8A whose one end 81A (81) is connected to the end of the metal seal tube 4 on the second space 22 side (left side in the figure), and a metal seal tube 4, the second cladding tube 8B has one end 81B (81) connected to the end on the side away from the second space 22 (right side in the figure). The first cladding tube 8A has a welded part W2 in which at least a part of the circumferential direction is welded to the end of the metal sealed tube 4 on the second space 22 side. It is fixed to the end on the 22 side. The second cladding tube 8B has a welded portion W3 in which at least a part of the circumferential direction is welded to the end portion of the metal sealed tube 4 on the side away from the second space 22. It is fixed to the end on the side away from the second space 22. The cladding tube 8 (the first cladding tube 8A, the second cladding tube 8B, and the third cladding tube 8C to be described later) is attached to the metal seal tube 4 by caulking other than welding, adhesion, fitting, brazing, or screw fastening. It may also be connected to a relay box 12, which will be described later.

In the embodiments shown in FIGS. 4, 5, and 7, the first cladding tube 8A covers at least one optical fiber 3 up to the sensing section 31. In the embodiment shown in FIGS. 4 to 8, the second cladding tube 8B covers at least one optical fiber 3 up to the first connection portion 51 of the optical fiber connector 5.

In the embodiment shown in FIG. 6, the first cladding tube 8A covers at least one optical fiber 3 up to a relay box 12, which will be described later. The other end of the first cladding tube 8A has a welded portion W5 that is at least partially welded to the relay box 12 in the circumferential direction, and is fixed to the relay box 12 by the welded portion W5. As shown in FIG. 6, the optical fiber sensor penetration structure 1 further includes a third cladding tube 8C, which has one end connected to the relay box 12 and covers at least one optical fiber 3 up to the sensing section 31. You can leave it there. The third cladding tube 8C has a bellows tube shape having peaks 82 and valleys 83 extending along the circumferential direction of the third cladding tube 8C alternately along the axial direction (longitudinal direction) of the third cladding tube 8C. is formed. The one end of the third cladding tube 8C has a welded portion W4 that is at least partially welded to the relay box 12 in the circumferential direction, and is fixed to the relay box 12 by the welded portion W4.

In the embodiment shown in FIG. 8, the first cladding tube 8A covers at least one optical fiber 3 (3B) up to the second connection portion 132 of the relay connector 13. As shown in FIG. 8, the optical fiber sensor penetration structure 1 further includes a fourth cladding tube 8D that covers at least one optical fiber 3 from the first connection portion 131 of the relay connector 13 to the sensing portion 31. You may be prepared. The fourth cladding tube 8D has a bellows tube shape having mountain portions 82 and valley portions 83 extending along the circumferential direction of the fourth cladding tube 8D alternately along the axial direction (longitudinal direction) of the fourth cladding tube 8D. is formed.

According to the above configuration, damage to the optical fiber 3 is suppressed by covering at least a part of the optical fiber 3 in the axial direction (longitudinal direction) with the cladding tube 8 and protecting the optical fiber 3 with the cladding tube 8. can. By suppressing damage to the optical fiber 3, the number of times the optical fiber 3 is replaced (replacement frequency) can be reduced.

(relay box)
In some embodiments, the above-mentioned optical fiber sensor penetration structure 1 is arranged inside the above-mentioned second space 22, as shown in FIG. 6, and the above-mentioned at least one optical fiber 3 has a circular shape. Alternatively, the relay box 12 is further provided which is configured to accommodate the extra length portion 34C wound into an elliptical shape.

In the illustrated embodiment, the relay box 12 is disposed inside the through hole 24. The relay box 12 has an internal space 120 formed therein for storing the excess portion 34C of at least one optical fiber 3 described above.

According to the above configuration, the coating tube 8 has a larger linear expansion coefficient than the optical fiber 3. Therefore, when the coating tube 8 is stretched due to heat input from outside the coating tube 8, the optical fiber 3 does not extend further than the coating tube 8, and if there is no excess length, there is a risk of the optical fiber 3 breaking. By storing the excess length 34C of the optical fiber 3 wound in a circular or elliptical shape in the relay box 12 arranged inside the second space 22, it is possible to prevent the optical fiber 3 from breaking when the coating tube 8 is stretched due to heat input from outside the coating tube 8. By preventing the optical fiber 3 from breaking, it is possible to reduce the number of times (replacement frequency) the optical fiber 3 needs to be replaced.

(Excess length of optical fiber)
In some embodiments, as shown in FIG. 5, at least one optical fiber 3 described above is inserted into the cladding tube 8 so as to have extra length portions 34A, 34B.

In the illustrated embodiment, the optical fiber 3 inserted into the first covering tube 8A has an excess portion 34A. That is, if the axial (longitudinal) length of the first covering tube 8A is defined as D1, and the length of the portion of the optical fiber 3 inserted into the first covering tube 8A is defined as L1, the condition L1>D1 is satisfied. The excess portion 34A is preferably 0.7%×D1 or more, and preferably satisfies the condition L1≧D1+0.7%×D1.

In the illustrated embodiment, the optical fiber 3 inserted into the second cladding tube 8B has an extra length portion 34B. That is, when the length of the second cladding tube 8B in the axial direction (longitudinal direction) is defined as D2, and the length of the portion of the optical fiber 3 inserted into the second cladding tube 8B is defined as L2, L2 >Condition D2 is satisfied. The extra length portion 34B is preferably 0.7%×D2 or more, and preferably satisfies the condition L2≧D2+0.7%×D2.

According to the above configuration, the cladding tube 8 has a larger coefficient of linear expansion than the optical fiber 3. For this reason, when the cladding tube 8 is extended due to heat input from the outside of the cladding tube 8, the optical fiber 3 does not extend further than the cladding tube 8, and there is a risk of disconnection if there is no extra length. By inserting the optical fiber 3 into the cladding tube 8 so as to have an extra length, it is possible to suppress the breakage of the optical fiber 3 when the cladding tube 8 is extended due to heat input from the outside of the cladding tube 8 . By suppressing breakage of the optical fiber 3, the number of times the optical fiber 3 is replaced (replacement frequency) can be reduced.

(inner metal tube)
When sealing between the metal seal tube 4 and at least one optical fiber 3 inserted into the metal seal tube 4 with the seal member 43A (see FIG. 2), the outer diameter (maximum diameter ) is relatively large. If the outer diameter of the seal member 43A is large, the seal member 43A and the metal seal tube 4 may become loose due to the difference in thermal expansion in the radial direction that occurs between the seal member 43A and the metal seal tube 4 connected to the outside of the seal member 43A. There is a possibility that the seal member 43</b>A and the metal seal tube 4 may peel off and leak from the seal between the seal member 43</b>A and the metal seal tube 4 .

Each of FIGS. 9 to 11 is a schematic cross-sectional view along the longitudinal direction of the metal seal tube 4 according to an embodiment of the present disclosure. FIG. 12 is a schematic sectional view showing a cross section perpendicular to the longitudinal direction of the metal seal tube 4 shown in FIG. 11. In some embodiments, the above-described optical fiber sensor penetrating structure 1 is arranged inside the metal seal tube 4 with a gap 44 between it and the metal seal tube 4, as shown in FIGS. 9 to 12. It further includes at least one inner metal tube 9 through which at least one optical fiber 3 is inserted.

The inner metal tube 9 is made of a metal material and has a cylindrical shape having an outer surface 91 and an inner surface 92. The inner metal tube 9 is loosely inserted into the metal seal tube 4, and the above-mentioned gap 44 is formed between the inner surface 42 of the metal seal tube 4 and the outer surface 91 of the inner metal tube 9. The inner surface 92 of the inner metal tube 9 forms an insertion hole through which at least one optical fiber 3 is loosely inserted, and there is a gap 43 between the inner surface 92 of the inner metal tube 9 and the outer surface of the optical fiber 3. is formed. In the illustrated embodiment, the inner metal tube 9 is formed into a cylindrical shape in which the outer surface 91 and the inner surface 92 have circular contours in a cross section perpendicular to the longitudinal direction of the inner metal tube 9 (FIG. 12). reference).

A sealing member 43B is disposed inside the inner metal tube 9, filling the above-mentioned gap 43 and sealing the inside of the inner metal tube 9. The sealing member 43B is adapted to abut on the inner surface 92 of the inner metal tube 9 and on the outer surface of the optical fiber 3. The seal member 43B is made of resin material or glass. By sealing the gap 43 formed inside the inner metal tube 9 with the sealing member 43B, fluid circulation (leakage) through the gap 43 can be suppressed.

According to the above configuration, the inner metal tube 9 disposed inside the metal seal tube 4 has an inner diameter (minimum diameter) smaller than that of the metal seal tube 4. In this case, the outer diameter (maximum diameter) of the sealing member 43B that seals between the inner metal tube 9 and at least one optical fiber 3 inserted into the inner metal tube 9 is made relatively small. be able to. Thereby, separation of the seal member 43B and the inner metal tube 9 due to a difference in radial thermal expansion occurring between the seal member 43B and the inner metal tube 9 can be suppressed, and the seal member 43B and the inner metal tube 9 can be prevented from peeling off. This can prevent leakage from occurring from the seal between the two.

(Fixing the inner metal tube by brazing)
In some embodiments, the at least one inner metal tube 9 described above is brazed to the metal seal tube 4, as shown in FIG. The gap 44 described above is filled with a solder 44A for joining by brazing.

According to the above configuration, at least one inner metal tube 9 and the metal seal tube 4 are joined by brazing. Then, the space between at least one inner metal tube 9 and the metal seal tube 4 is sealed by the solder 44A that is joined by brazing. By using the solder 44A as a member that seals between at least one inner metal tube 9 and the metal seal tube 4, thermal expansion between the inner metal tube 9 and the metal seal tube 4 can be suppressed. Since the thermal expansion can be made equal to the thermal expansion of the metal seal tube 4, the thermal stress generated between the inner metal tube 9 and the metal seal tube 4 can be reduced.

Note that since there is a possibility that the brazing temperature exceeds the heat resistance temperature of the sealing member 43B, it is preferable to perform brazing before filling the gap 43 with the sealing member 43B.

(Fixing the inner metal tube by welding)
In some embodiments, as shown in FIG. 10, the at least one inner metal tube 9 described above has a metal seal tube 4 circumferentially welded to at least one end 93, 94 of the inner metal tube 9. It has welded parts W8 and W9.

In the illustrated embodiment, the inner metal tube 9 has a welded portion W8 in which one end face in the axial direction (longitudinal direction) of the metal seal tube 4 is circumferentially welded to the outer surface of one end in the axial direction (longitudinal direction) of the inner metal tube 9. The welded portion W8 fixes the inner metal tube 9 to the metal seal tube 4 and seals the gap between the metal seal tube 4 and the inner metal tube 9.

In the illustrated embodiment, the inner metal tube 9 has the other axial (longitudinal) end surface of the metal seal tube 4 circumferentially welded to the outer surface of the other axial (longitudinal) end of the inner metal tube 9. It has a welded part W9. The inner metal tube 9 is fixed to the metal seal tube 4 by the weld W9, and the space between the metal seal tube 4 and the inner metal tube 9 is sealed. Note that the inner metal tube 9 only needs to have at least one of the welded portion W8 and the welded portion W9.

According to the above configuration, at least one inner metal tube 9 and the metal seal tube 4 are joined by the circumferentially welded welds W8 and W9. The space between at least one inner metal tube 9 and the metal seal tube 4 is sealed by the circumferentially welded welds W8 and W9.

Note that the welding temperature for forming the welds W8 and W9 may exceed the heat-resistant temperature of the seal member 43B, so the welding for forming the welds W8 and W9 should be performed before filling the gap 43 with the seal member 43B. It is preferable to do so.

(Multiple inner metal tubes)
In some embodiments, as shown in FIGS. 11 and 12, the at least one inner metal tube 9 described above may include a plurality of inner metal tubes 9 each having at least one optical fiber 3 (3C-3F) inserted therethrough. Contains inner metal tubes 9 (9A to 9D).

In the illustrated embodiment, a plurality of inner metal tubes 9 are inserted into the metal seal tube 4 . Each of the plurality of inner metal tubes 9 is brazed to the metal seal tube 4. Note that in other embodiments, each of the plurality of inner metal tubes 9 is fixed to the metal seal tube 4 by welding, and the space between each of the plurality of inner metal tubes 9 and the metal seal tube 4 is sealed. It is also possible to make it look like this.

According to the above configuration, each of the plurality of inner metal tubes 9 protects the optical fiber 3 inserted into each inner metal tube 9, so that damage to the optical fiber 3 can be suppressed. By arranging a plurality of inner metal tubes 9 inside the metal seal tube 4, a plurality of optical fibers 3, each protected by the inner metal tube 9, can be inserted into the metal seal tube 4 all at once. .

(Gasifier)
FIG. 13 is a schematic cross-sectional view of a gasifier according to an embodiment of the present disclosure. Gasifier 2A according to some embodiments is configured to partially combust and gasify carbon-containing solid fuel. As shown in FIG. 13, the gasifier 2A includes the above-mentioned optical fiber sensor penetration structure 1, the above-mentioned second space 22 formed inside the above-mentioned pressure vessel 2, and the above-mentioned second space 22 formed outside the pressure vessel 2. and the above-mentioned partition wall 23 that partitions the above-mentioned first space 21. The gasification furnace 20 described above is installed inside the pressure vessel 2 . The gasifier 20 includes the above-mentioned gasifier wall 28 that partitions the gasifier inner space 280 formed inside the gasifier 20 and the above-described second space 22 formed in the gasifier 20, and a second At least one burner device 29 (in the illustrated example, a plurality of burner devices 29) is attached to the gasifier wall 28 in the space 22 and burns the carbon-containing solid fuel introduced into the gasifier interior space 280. As shown in FIG. 13, the second space 22 described above is formed by the outer surface of the gasifier wall 28 and the inner surface of the partition wall (pressure vessel wall) 23 of the pressure vessel 2 that covers the outer periphery of the gasifier wall 28. It may also be an annulus portion.

According to the above configuration, the optical fiber 3 is transmitted from the inside of the pressure vessel 2 to the outside by the at least one optical fiber 3 inserted into the through hole 24 passing through the partition wall 23 that partitions the inside and outside of the pressure vessel 2. The optical signal can be extracted. Moreover, the metal seal tube 4 and the joint member 6 can suppress fluid flow (leakage) between the inside and outside of the pressure vessel 2 via the through hole 24 . Moreover, the gasifier 2A equipped with the optical fiber sensor penetration structure 1 can easily install (newly install) the optical fiber 3 for monitoring the internal state of the gasifier 2A, and the optical fiber 3 can be easily installed (newly installed). In such cases, the optical fiber 3 can be easily replaced.

In this specification, expressions expressing relative or absolute configuration, such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial," do not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.
For example, expressions indicating that things are in an equal state, such as "identical,""equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained.
Furthermore, in this specification, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to shapes such as a rectangular shape or a cylindrical shape in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained.
In addition, in this specification, the expressions "comprise,""include," or "have" a certain element are not exclusive expressions that exclude the presence of other elements.

The present disclosure is not limited to the embodiments described above, and also includes forms in which modifications are added to the embodiments described above, and forms in which these forms are appropriately combined.

The contents described in the several embodiments described above can be understood, for example, as follows.

1) A penetrating structure (1) of an optical fiber sensor according to at least one embodiment of the present disclosure,
A penetrating structure (1) for an optical fiber sensor that penetrates a partition wall (23) that partitions a first space (21) and a second space (22) whose inside temperature is higher than the first space (21), ,
at least one optical fiber (3) inserted into a through hole (24) penetrating the partition wall (23);
a metal seal tube (4) through which the at least one optical fiber (3) is inserted;
an optical fiber connector (5) having a connection part (51) to which one end of the at least one optical fiber (3) is connected;
It has an insertion hole (63, 64) through which the metal seal tube (4) is inserted, and is configured to detachably support the metal seal tube (4) inserted into the insertion hole (63, 64). a joint member (6);
The insertion holes (63, 64) of the joint member (6) were formed in a size that allowed the optical fiber connector (5) to be inserted therethrough.

According to configuration 1) above, the penetration structure (1) of the optical fiber sensor has a relatively high temperature due to at least one optical fiber (3) inserted into the penetration hole (24) passing through the partition wall (23). The optical signal transmitted by the optical fiber (3) can be taken out from the second space of the space to the first space of relatively low temperature. The penetrating structure (1) of the optical fiber sensor has a metal seal tube (4) and a joint member (6) that connect a first space (21) and a second space (22) via a through hole (24). Fluid circulation (leakage) can be suppressed.

Further, according to configuration 1) above, the penetration structure (1) of the optical fiber sensor connects the insertion holes (63, 64) of the joint member (6) to the metal seal tube (4) and the optical fiber connector (5). By forming the metal seal tube (4) to which the optical fiber (3) is attached and the optical fiber connector (5) into the insertion hole (63, 64), the metal seal tube (4) and the optical fiber connector (5) can be passed through the insertion hole (63, 64). can. In this case, unlike conventional methods, a single optical fiber (3) that is not attached to a metal seal tube (4) or an optical fiber connector (5) is inserted into the insertion hole (063, 064) of the coupling member (06). There is no need to attach it to the metal seal tube (4) or optical fiber connector (5) after inserting it. Such a penetrating structure (1) of the optical fiber sensor allows the optical fiber (3) to be easily installed (newly installed), and also allows the optical fiber (3) to be easily installed when the optical fiber (3) is damaged. Exchangeable.

2) In some embodiments, the optical fiber sensor penetration structure (1) described in 1) above,
The joint member (6) is
a joint body (61) having a first insertion hole (63) through which the metal seal tube (4) is inserted;
It includes at least a nut member (62) having a second insertion hole (64) through which the metal seal tube (4) is inserted, and a threaded portion (66) threaded onto the joint body (61).

According to configuration 2) above, by screwing the threaded portion (66) of the nut member (62) into the joint body (61), the first insertion hole (63) and the second insertion hole (64) are connected. The inserted metal seal tube (4) can be supported by the joint member (6). Moreover, by releasing the threaded connection between the joint body (61) and the nut member (62), the metal seal tube (4) can be easily removed from the joint member (6). The penetrating structure (1) of the optical fiber sensor including such a joint member (6) allows the optical fiber (3) to be easily installed (newly installed), and the optical fiber (3) can be easily installed (newly installed). The fiber (3) can be easily replaced.

3) In some embodiments, the optical fiber sensor penetration structure (1) described in 2) above,
The joint body (61) was arranged in the first space (21), and one end in the extending direction of the first insertion hole (63) was connected to the partition wall (23).

According to configuration 3) above, the joint member (6) can be fixed to the partition wall (23) by connecting one end of the joint body (61) to the partition wall (23). By placing the joint body (61) in the relatively low temperature first space (21), the joint member (6) and the metal seal pipe Heat input from the outside to (4) can be suppressed, and damage to the joint member (6) and the metal seal tube (4) due to heat can be suppressed.

4) In some embodiments, the optical fiber sensor penetration structure (1) described in 2) above,
The partition wall (23) is arranged in the first space (21), one end (71) is connected to one end in the extending direction of the first insertion hole (63) of the joint body (61), and the partition wall (23) It further includes a metal extension tube (7) whose other end (72) is connected to the metal extension tube (7).

According to the configuration of 4) above, the coupling member (6) can be fixed to the partition wall (23) by connecting one end of the coupling body (61) to the partition wall (23) via the metal extension tube (7). By connecting the coupling body (61) to the partition wall (23) via the metal extension tube (7), the input of heat from the outside to the coupling member (6) and the metal seal tube (4) can be suppressed compared to when the coupling body (61) is directly connected to the partition wall (23), and damage to the coupling member (6) and the metal seal tube (4) due to heat can be suppressed.

5) In some embodiments, the optical fiber sensor penetration structure (1) described in 4) above,
The apparatus further includes a relay connector (13) that is disposed inside the metal extension tube (7) and removably relays the at least one optical fiber (3).

According to configuration 5) above, the temperature inside the metal extension tube (7) is reduced by the heat radiation from the inside of the metal extension tube (7) to the outside (first space 21). lower than the temperature. By lowering the temperature inside the metal extension tube (7) than the heat-resistant temperature of the relay connector (13), it becomes possible to arrange the relay connector (13) inside the metal extension tube (7). By placing the relay connector (13) inside the metal extension tube (7), an abnormality such as disconnection or signal abnormality occurs in at least one optical fiber (3) connected to the relay connector (13). In some cases, the optical fiber (3) can be easily replaced.

6) In some embodiments, the optical fiber sensor penetration structure (1) according to any one of 1) to 5) above,
A cladding tube (8) having one end (81) connected to the metal seal tube (4) and covering at least a portion of the at least one optical fiber (3) in the axial direction, the cladding tube (8) The flexible cladding tube (8) is further provided with a flexible cladding tube (8) having peaks and valleys extending along the circumferential direction of the cladding tube (8) alternately along the axial direction of the cladding tube (8).

According to the configuration 6) above, at least a part of the optical fiber (3) in the axial direction is covered with the cladding tube (8), and the optical fiber (3) is protected by the cladding tube (8), so that the optical fiber (3) can be protected from light. Damage to the fiber (3) can be suppressed. By suppressing damage to the optical fiber (3), the number of times the optical fiber (3) is replaced (replacement frequency) can be reduced.

7) In some embodiments, the optical fiber sensor penetration structure (1) described in 6) above,
Further, a relay box (12) is arranged inside the second space (22) and configured to be able to store an extra length of the at least one optical fiber (3) wound in a circular or elliptical shape. Be prepared.

According to configuration 7) above, the cladding tube (8) has a larger coefficient of linear expansion than the optical fiber (3). Therefore, when the cladding tube (8) is extended due to heat input from the outside of the cladding tube (8), the optical fiber (3) does not extend further than the cladding tube (8), so there is no excess length. There is a risk of wire breakage. By storing the extra length of the optical fiber (3) wound in a circular or elliptical shape in the relay box (12) disposed inside the second space (22), the cladding tube (8) It is possible to suppress breakage of the optical fiber (3) when the cladding tube (8) is extended due to heat input from the outside. By suppressing the breakage of the optical fiber (3), the number of times the optical fiber (3) is replaced (replacement frequency) can be reduced.

8) In some embodiments, the optical fiber sensor penetration structure (1) described in 6) above,
The at least one optical fiber (3) is inserted into the cladding tube (8) so as to have an extra length.

According to the above configuration 8), the coating tube (8) has a larger linear expansion coefficient than the optical fiber (3). Therefore, when the coating tube (8) is stretched due to heat input from outside the coating tube (8), the optical fiber (3) does not extend further than the coating tube (8), and if there is no excess length, there is a risk of the optical fiber (3) breaking. By inserting the optical fiber (3) so that it has excess length inside the coating tube (8), it is possible to prevent the optical fiber (3) from breaking when the coating tube (8) is stretched due to heat input from outside the coating tube (8). By preventing the optical fiber (3) from breaking, it is possible to reduce the number of times (replacement frequency) the optical fiber (3) needs to be replaced.

9) In some embodiments, the optical fiber sensor penetration structure (1) according to any one of 1) to 8) above,
At least one inner metal tube (9) disposed inside the metal seal tube (4) with a gap between the metal seal tube (4) and through which the at least one optical fiber (3) is inserted. ).

When sealing between the metal seal tube (4) and at least one optical fiber (3) inserted into the metal seal tube (4) with a seal member, the outer diameter (maximum diameter) of the seal member becomes relatively large. If the outer diameter of the seal member is large, the seal member and the metal seal tube (4) may peel off due to the difference in radial thermal expansion that occurs between the seal member and the metal seal tube (4) connected to the outside of the seal member. , there is a risk that leakage may occur from the seal between the seal member and the metal seal tube (4). According to configuration 9) above, the inner metal tube (9) disposed inside the metal seal tube (4) has an inner diameter (minimum diameter) smaller than that of the metal seal tube (4). In this case, compare the outer diameter (maximum diameter) of the sealing member that seals between the inner metal tube (9) and at least one optical fiber (3) inserted into the inner metal tube (9). The target can be made small. As a result, separation of the seal member and the inner metal tube (9) due to a difference in radial thermal expansion between the seal member and the inner metal tube (9) can be suppressed, and the seal member and the inner metal tube (9) can be prevented from peeling. (9) It is possible to prevent leakage from occurring from the seal between the seals.

10) In some embodiments, the through structure (1) of the optical fiber sensor described in 9) above,
The at least one inner metal tube (9) is brazed to the metal seal tube (4).

According to configuration 10) above, at least one inner metal tube (9) and the metal seal tube (4) are joined by brazing. Then, the at least one inner metal tube (9) and the metal seal tube (4) are sealed with a solder that is joined by brazing. By using a member that seals between at least one inner metal tube (9) and the metal seal tube (4), thermal expansion between the inner metal tube (9) and the metal seal tube (4) is reduced. Since the thermal expansion can be made equal to the thermal expansion of the inner metal tube (9) and the metal seal tube (4), the thermal stress generated between the inner metal tube (9) and the metal seal tube (4) can be reduced.

11) In some embodiments, the optical fiber sensor penetration structure (1) described in 9) above,
The at least one inner metal tube (9) has a weld (W8, W9) circumferentially welded to the metal seal tube (4) at at least one end of the inner metal tube (9).

According to configuration 11) above, at least one inner metal tube (9) and the metal seal tube (4) are joined by the welded portions (W8, W9) welded in the circumferential direction. The welded portions (W8, W9) welded in the circumferential direction seal the space between at least one inner metal tube (9) and the metal seal tube (4).

12) In some embodiments, the optical fiber sensor penetrating structure (1) according to any one of 9) to 11) above,
Said at least one inner metal tube (9) comprises a plurality of inner metal tubes (9) each through which said at least one optical fiber (3) is inserted.

According to configuration 12) above, each of the plurality of inner metal tubes (9) protects the optical fiber (3) inserted into each inner metal tube (9), so that the optical fiber (3) Damage can be suppressed. By arranging a plurality of inner metal tubes (9) inside the metal seal tube (4), a plurality of optical fibers (3) each protected by an inner metal tube (9) can be metal sealed at once. It can be inserted into the tube (4).

13) The gasifier (2A) according to at least one embodiment of the present disclosure includes:
A gasifier (2A) configured to partially burn and gasify carbon-containing solid fuel,
The penetration structure (1) of the optical fiber sensor according to any one of 1) to 12) above;
The second space (22) is formed inside the pressure vessel (2) in which the gasifier (20) is installed, and the first space (21) is formed outside the pressure vessel (2). and the partition wall (23) that partitions the.

According to configuration 13) above, the pressure vessel (2) is The optical signal transmitted by the optical fiber (3) can be extracted from the inside of the optical fiber (2) to the outside. Further, the metal seal pipe (4) and the joint member (6) can suppress fluid flow (leakage) between the inside and outside of the gasifier (2A) via the through hole (24). In addition, the gasifier (2A) equipped with the optical fiber sensor penetration structure (1) allows easy installation (new installation) of the optical fiber (3) for monitoring the internal state of the gasifier (2A). In addition, when the optical fiber (3) is damaged, the optical fiber (3) can be easily replaced.

1 Penetrating structure of optical fiber sensor 2 Pressure vessel 2A Gasifier 3 Optical fiber 3A First optical fiber 3B Second optical fiber 4 Metal seal tube 5 Optical fiber connector 6 Joint member 7 Metal extension tube 7A First metal extension tube 7B 2 Metal extension tube 8 Cladding tube 8A First cladding tube 8B Second cladding tube 8C Third cladding tube 8D Fourth cladding tube 9 Inner metal tube 10 Measuring instrument 11 Relay optical fiber 12 Relay box 13 Relay connector 20 Gasifier 21 First space 22 Second space 23 Partition wall 24 Through hole 25 Sealing member 26 Fastening member 26A Bolt 26B Nut 27 Heat insulator 28 Gasifier wall 29 Burner device 31 Sensing section 34A, 34B, 34C Extra length portion 43, 44 Gap 43A , 43B Seal member 44A Braze 61 Joint body 62 Nut member 63 First insertion hole 64 Second insertion hole 65, 66 Threaded portion 82 Peak portion 83 Valley portion 101 Irradiation portion 102 Light receiving portion 120 Internal space 231 Partition wall body 232 Projection portion 233 Flange part 252 Center hole L Distance W1 to W9 Welding part

Claims (13)

A penetrating structure for an optical fiber sensor that penetrates a partition wall that partitions a first space and a second space whose interior temperature is higher than the first space,
at least one optical fiber inserted into a through hole penetrating the partition;
a metal seal tube through which the at least one optical fiber is inserted;
an optical fiber connector having a connection portion to which one end of the at least one optical fiber is connected;
a joint member having an insertion hole through which the metal seal tube is inserted, and configured to detachably support the metal seal tube inserted into the insertion hole,
The insertion hole of the coupling member is formed in a size that allows the optical fiber connector to be inserted therethrough.
Penetrating structure of optical fiber sensor. The joint member is
a joint body having a first insertion hole through which the metal seal tube is inserted;
at least a nut member having a second insertion hole through which the metal seal tube is inserted and a threaded portion that threads into the joint body;
A penetrating structure for an optical fiber sensor according to claim 1. The joint body is disposed in the first space, and one end in the extending direction of the first insertion hole is connected to the partition wall.
A penetrating structure for an optical fiber sensor according to claim 2. further comprising a metal extension tube disposed in the first space, one end connected to one end in the extending direction of the first insertion hole of the joint body, and the other end connected to the partition wall;
A penetrating structure for an optical fiber sensor according to claim 2. further comprising a relay connector disposed inside the metal extension tube and detachably relaying the at least one optical fiber;
A penetrating structure for an optical fiber sensor according to claim 4. A cladding tube having one end connected to the metal seal tube and covering at least a portion of the at least one optical fiber in the axial direction, the crests and troughs extending along the circumferential direction of the cladding tube. Further comprising flexible cladding tubes arranged alternately along the axial direction of the cladding tubes,
A penetrating structure for an optical fiber sensor according to any one of claims 1 to 5. further comprising a relay box disposed inside the second space and configured to accommodate an extra length of the at least one optical fiber wound in a circular or elliptical shape;
A penetrating structure for an optical fiber sensor according to claim 6. The at least one optical fiber is inserted into the cladding tube so as to have an extra length.
A penetrating structure for an optical fiber sensor according to claim 6. and at least one inner metal tube disposed inside the metal seal tube with a gap between the metal seal tube and the inner metal tube, through which the at least one optical fiber is inserted.
The through structure for an optical fiber sensor according to any one of claims 1 to 5. the at least one inner metal tube is brazed to the metal seal tube;
The penetration structure for an optical fiber sensor according to claim 9. The at least one inner metal tube has a welded portion where the metal seal tube is circumferentially welded to at least one end of the inner metal tube.
A penetrating structure for an optical fiber sensor according to claim 9. The at least one inner metal tube includes a plurality of inner metal tubes, each inner metal tube through which the at least one optical fiber is inserted.
A penetrating structure for an optical fiber sensor according to claim 9. A gasifier configured to partially burn and gasify carbon-containing solid fuel,
A penetrating structure for an optical fiber sensor according to any one of claims 1 to 5,
The partition wall partitions the second space formed inside a pressure vessel in which a gasification furnace is installed and the first space formed outside the pressure vessel.
Gasifier.

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