JP5475352B2 - How to detect the internal state of expansion joints - Google Patents

Description

  The present invention relates to an expansion joint and a method for detecting the internal state thereof, and more particularly to an expansion joint for connecting between a duct through which a heated fluid passes and a method for detecting the internal state thereof.

  Conventionally, expansion joints are connected to multiple exhaust ducts that drive turbines with combustion gas that is mixed and burned with air compressed by a compressor and supplied fuel, and transfer the exhaust that is discharged. Have been proposed (see, for example, Patent Document 1). In this expansion joint, a heat insulating material is provided on the exhaust side, a first bellows is provided outside the heat insulating material, a second bellows is provided outside the first bellows, and a compressor is provided between the first and second bellows. By supplying a part of the air compressed in step S3 and cooling it, it is possible to suppress the melt damage of the expansion joint.

Japanese Patent Laid-Open No. 11-13964

  By the way, in general, in the expansion joint described in Patent Document 1, when the expansion joint is continuously used, for example, the heat insulating material disposed near the exhaust is hardened due to the heat history over time. Damage may be caused by expansion and contraction due to repeated start / stop of the combustor. This was dealt with by setting the durable life of the heat insulating material including a predetermined margin based on past results and replacing it in accordance with the durable life. However, even if there is no damage, it may be replaced uniformly, and it has been desired to appropriately grasp the state of the heat insulating material.

  This invention is made | formed in view of such a subject, and it aims at providing the expansion joint which can grasp | ascertain the state of a heat insulation part more appropriately, and its internal state detection method.

  The present invention adopts the following means in order to achieve the main object described above.

The expansion joint of the present invention is
A blocking portion disposed between the first duct and the second duct through which the heated fluid flows, and blocking the fluid;
A thermal fuse that is disposed inside the shut-off portion in a state in which the fluid can flow, insulates the heat of the fluid to the shut-off portion, and is provided with a terminal that can be electrically connected from the outside and is disconnected at a predetermined temperature or more One or more heat insulating parts,
It is equipped with.

  In this expansion joint, the fluid is blocked by the blocking portion disposed between the first duct and the second duct through which the fluid flows, and to the blocking portion by the heat insulating portion disposed inside the blocking portion. Insulate the heat of the fluid. This heat insulating part is provided with a terminal that can be electrically connected from the outside, and is provided with one or more thermal fuses that are disconnected at a predetermined temperature or more. It is possible to detect whether the thermal fuse is broken. When the temperature fuse is not disconnected, it can be seen that the heat insulating portion is not higher than the predetermined temperature, and when the temperature fuse is disconnected, it is understood that the heat insulating portion is higher than the predetermined temperature. When the temperature reaches the temperature at which the thermal fuse is disconnected, it can be seen that the function of the heat insulating portion on the fluid side is degraded from the position where the thermal fuse is disposed. Thus, by electrically connecting from the outside, it is possible to detect the state of the heat insulating portion in a non-destructive manner. Therefore, the state of the heat insulation part of the expansion joint can be grasped more appropriately. Here, examples of the “fluid” include gases such as exhaust and intake air, liquids such as solutions, and solids such as powders.

  In the expansion joint according to the present invention, the heat insulating portion is provided with a first temperature fuse that is disconnected at a predetermined first temperature and a second temperature fuse that is disconnected at a second temperature equal to or higher than the first temperature as the temperature fuse. It is good as it is. If it carries out like this, it will be possible to detect the stepwise temperature state of a heat insulation part, and the degradation state of a heat insulation part can be grasped | ascertained in steps.

  In the expansion joint of the present invention, the heat insulating part may have a plurality of heat insulating layers, and the thermal fuse may be disposed in at least two heat insulating layers. In this way, since the state in the depth direction is also obtained depending on the position of the disconnected heat insulating layer, the deterioration state of the heat insulating portion can be grasped in more detail.

  In the expansion joint according to the present invention, the heat insulating portion may be arranged in a stretched manner so that two or more of the thermal fuses intersect each other. By doing this, it is possible to detect the position where the disconnected thermal fuse intersects, so that it is possible to specify the position where the heat insulating portion has deteriorated, and it is possible to grasp the detailed deterioration state of the heat insulating portion. Here, “two or more of the thermal fuses intersect each other” means that, for example, a plurality of thermal fuses are arranged in a state where one thermal fuse intersects with a plurality of thermal fuses. At this time, it is more preferable that the two or more intersecting temperature fuses are arranged in a state where they are not electrically connected. The “state of not being electrically connected” may be, for example, a state in which the surface of the electrical fuse is insulated or a shape that intersects three-dimensionally so as not to contact.

  In the expansion joint according to the present invention, the thermal insulation portion is provided with the thermal fuse in each of a plurality of regions dividing the thermal insulation portion, and each terminal of the thermal fuses can be electrically connected from the outside. It is good also as what is arrange | positioned. If it carries out like this, it can identify to the area | region where the heat insulation part deteriorated with the position of the disconnected thermal fuse, and can grasp | ascertain the deterioration state of a more detailed heat insulation part.

  In the expansion joint according to the present invention, the thermal fuse may be provided with the thermal fuse so as to be arranged in a direction orthogonal to the flow direction of the fluid. Alternatively, the thermal insulation may be provided with the thermal fuse so as to be arranged in the fluid flow direction. If it carries out like this, since the terminal of one end can be taken from the 1st duct side and the terminal of the other end can be taken from the 2nd duct side, it is comparatively easy to provide a terminal.

  The expansion joint of this invention WHEREIN: The said heat insulation part is good also as a thing by which the said terminal is arrange | positioned by the side surface side of the said expansion joint. In this way, it is easy to perform an operation of making an electrical connection to the terminal and confirming the disconnection of the thermal fuse. Moreover, when the aspect in which the thermal fuse is provided in the direction orthogonal to the flow direction of the fluid is employed, the terminal is easily provided on the side surface side of the expansion joint. Here, the “side surface side of the expansion joint” includes the lower surface side, the upper surface side, and the left and right surface sides. Further, the terminals may be arranged in the flow direction of the fluid, for example, on the side surface of the expansion joint, or may be arranged in a partial region on the side surface side of the expansion joint. Also good.

  In the expansion joint of the present invention, the heat insulating part may be provided with a plurality of insulated thermal fuses. By doing so, it is possible to suppress short-circuits or cross-overs with a plurality of thermal fuses, and to more accurately grasp the deterioration state of the heat insulating portion.

  In the expansion joint of the present invention, the heat insulating part and the blocking part are fixed to the generator side so as to circulate the fluid after the fuel is burned and generated by the generator, It is good also as what is arrange | positioned by the 2nd duct fixed to the chimney side which discharge | releases the said fluid. In so-called power generation facilities, expansion joints are often used, and replacement of a heat insulating part affects the operating rate, so that the present invention is highly meaningful.

  The expansion joint internal state detection method of the present invention includes a step of connecting a detection device to a terminal provided in any one of the expansion joints described above and detecting the presence or absence of disconnection of the thermal fuse. . In this internal state detection method, it is possible to more appropriately grasp the state of the heat insulating portion of the expansion joint in a non-destructive manner by detecting the presence or absence of disconnection of the thermal fuse with respect to any of the expansion joints described above. Here, examples of the “detection device” include a tester capable of detecting electrical connection and a data logger for detecting electrical connection of each temperature fuse at regular or irregular timing.

The block diagram which shows the outline of a structure of the thermal power plant 10 which is one Embodiment of this invention. Sectional drawing of the expansion joint 30. FIG. The block diagram which shows the outline of a structure of the heat insulation part 31 and the heat insulation part state detection part 50. FIG. Explanatory drawing of the method of detecting the internal state of the heat insulation part 31. FIG. Explanatory drawing of the heat insulation part state detection part 150. FIG. Explanatory drawing of the heat insulation part state detection part 250. FIG. Explanatory drawing of the heat insulation part state detection part 350. FIG. Explanatory drawing of the heat insulation part state detection part 450. FIG.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a configuration of a thermal power plant 10 according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of an expansion joint 30, and FIG. 3 shows a heat insulating portion 31 and a heat insulating portion. 2 is a configuration diagram showing an outline of a configuration of a state detection unit 50. FIG. As shown in FIG. 1, the thermal power plant 10 of the present embodiment connects a compressor 12 to which an air introduction pipe 11 is connected and compresses air, and fuel supplied via the fuel introduction pipe 14 to the compressor 12. A combustor 16 that combusts by the supplied compressed air, and a generator 18 that is connected to a rotating shaft of a turbine 17 that is rotationally driven by the combustion gas and generates electric power by the rotational driving force are disposed. The thermal power plant 10 is fixed to the downstream side of the combustor 16 and discharges the exhaust to the outside, and a first duct 22 that is a cylindrical body through which exhaust as a high-temperature fluid passes after power is generated by the combustion gas. The second duct 24, which is a cylindrical body connected to the chimney 26 side and through which the exhaust passes, is disposed between the first duct 22 and the second duct 24 and blocks the exhaust from being discharged to the outside. A non-metallic expansion joint 30 that relaxes expansion and contraction is disposed. Although not shown in the figure, the thermal power plant 10 has a heat recovery boiler and a cooling water flow path provided downstream of the combustor 16, and generates power by driving a steam turbine with steam generated by the heat recovery boiler. It is configured as a facility that performs cycle-type power generation.

  Next, the expansion joint 30 which is the main structure of this invention is demonstrated. As shown in FIG. 2, the expansion joint 30 is formed in a cylindrical body, and is disposed between the first duct 22 and the second duct 24 through which the exhaust passes so that the exhaust can pass through. Here, on the downstream side of the first duct 22, a baffle plate 23 formed as a cylindrical body whose tip is smaller than the inner diameter of the second duct 24 is disposed. The baffle plate 23 can be made of, for example, stainless steel. Here, the first duct 22 is fixed to the generator 18 side with the baffle plate 23 inserted in the opening on the upstream side of the second duct 24, and the second duct 24 is fixed to the chimney 26 side. In addition, the expansion joint 30 has one end fixed to a fixing base 22 a provided on the outer periphery of the first duct 22 so as to surround the outer periphery of the baffle plate 23, and the fixing joint provided on the outer periphery of the second duct 24. The other end is fixed to the base 24a. As described above, the expansion joint 30 is disposed so as not to be directly exposed to the exhaust gas that has passed through the first duct 22 due to the presence of the baffle plate 23.

  The expansion joint 30 includes a heat insulating portion 31 that insulates the heat of the exhaust, and a bellows 36 that is disposed outside the heat insulating portion 31 and has a flexibility and blocks the exhaust. The heat insulating part 31 is a member that protects the bellows 36, and is fixed by a restraining tool in a state in which one end thereof is in contact with the inner wall of the fixing base 22a and the other end is in contact with the inner wall of the fixing base 24a. ing. The heat insulating portion 31 is composed of four layers of a first heat insulating material 32 and a second heat insulating material 33 having higher heat resistance and a third heat insulating material 34 and a fourth heat insulating material 35 having relatively high heat resistance in order from the inside. It was supposed to be configured. The first heat insulating material 32 and the second heat insulating material 33 can be made of, for example, ceramic fiber felt. Moreover, the 3rd heat insulating material 34 and the 4th heat insulating material 35 can be comprised with felt made from glass fiber. Note that the number of layers of the heat insulating material may be appropriately selected according to the exhaust gas temperature, flow rate, and the like. The material of the heat insulating portion 31 may be appropriately selected from ceramic fiber felt, glass fiber felt, and combinations thereof. Inside the heat insulating portion 31, one or more temperature fuses that are provided at the tip of the terminals that can be electrically connected from the outside and are disconnected at a predetermined temperature or more are disposed. This thermal fuse constitutes the heat insulation part state detection part 50.

  One end of the bellows 36 is clamped between the outer surface of the fixing base 22a and the pressing plate 37 and fixed by a restraining tool, and the other end is clamped and fixed between the outer surface of the fixing base 24a and the pressing plate 38. ing. The bellows 36 is, for example, in order from the inside, a fluid side layer that is a composite material of a fluororesin layer sheet and a glass fiber cloth, an intermediate layer that is a glass fiber cloth, and a glass fiber cloth with stainless wire. It has a four-layer structure with the outer layer, the inner side being a corrosion-resistant layer, and the outer side being constituted by a layer imparting mechanical strength. The inner surface of the bellows 36 may be provided with a protective layer that is a corrosion-resistant layer made of, for example, a fluororesin sheet. Thus, the heat insulation part 31 and the bellows 36 release the exhaust, and the first duct 22 fixed to the generator 18 side so as to distribute the exhaust after the fuel is burned and generated by the generator 18. The second duct 24 is fixed to the chimney 26 side. In addition, since the bellows 36 is in a tensioned state or not in a tensioned state depending on the presence or absence of exhaust pressure, a space for moving the bellows 36 is provided between the bellows 36 and the heat insulating portion 31. The bellows 36 and the heat insulating portion 31 are fixed between the first duct 22 and the second duct 24, respectively.

  As shown in FIG. 3, the heat insulation part state detection unit 50 includes a plurality of fuse groups disposed inside the heat insulation part 31, and a connection terminal group 41 connected to the fuses and provided outside the expansion joint 30. It is comprised by. Although all the thermal fuses are connected to the connection terminals in the heat insulation state detection unit 50, only the connections between some of the thermal fuses and the connection terminal group 41 are shown in FIGS. ing. In the heat insulation state detector 50, the first fuse group 42 inside the first heat insulating material 32, the second fuse group 43 inside the second heat insulating material 33, and a third unillustrated third heat insulating material 34 inside the third heat insulating material 34. The fourth fuse group 45 is disposed inside the fourth heat insulating material 35. Thus, the heat insulating part 31 has a plurality of heat insulating layers of the first heat insulating material 32, the second heat insulating material 33, the third heat insulating material 34, and the fourth heat insulating material 35, and the thermal fuses are all the heat insulating layers. It is arranged. In the heat insulation part state detection part 50, each temperature fuse is arrange | positioned so that it may arrange in the direction orthogonal to the distribution direction of exhaust_gas | exhaustion. The first fuse group 42 includes a first temperature fuse 51 that is disconnected at a predetermined first temperature and a second temperature fuse 52 that is disconnected at a second temperature equal to or higher than the first temperature. Thereby, the temperature where the 1st heat insulating material 32 is exposed can be evaluated in steps. The first temperature and the second temperature at which the thermal fuse is disconnected are appropriately determined as temperatures at which it is possible to detect that the heat insulating material has deteriorated based on the heat resistant temperature of the heat insulating material provided, the temperature of the exhaust, or the like. be able to. The first temperature and the second temperature at which the thermal fuse is disconnected can be set to, for example, 70%, 80%, 90%, and the heat-resistant temperature of the heat-resistant temperature of the heat insulating material. Further, the first temperature and the second temperature at which the thermal fuse is disconnected are temperatures exceeding the temperature range to which each heat insulating material is exposed in the state where the function of each heat insulating material is exhibited during operation of the thermal power plant 10, for example When the temperature range to which the heat insulating material is normally exposed is 60% or less of the exhaust temperature, the exhaust temperature is set to 70% or when the temperature range is 70% or less of the exhaust temperature. When the temperature is 80% or less than 80% of the exhaust temperature, the temperature can be set to a temperature that the heat insulating material cannot normally take, such as 90% of the exhaust temperature. The first fuse group 42 is disposed on the outside of the first heat insulating material 32, that is, at a position relatively away from the exhaust. The first thermal fuse 51 is formed in a C shape, and one end of the first connection terminal line 51a is connected to the C-shaped opening. The other end of the first connection terminal line 51 a is connected to the connection terminal of the connection terminal group 41. The second thermal fuse 52 is formed in a C shape, and one end of the second connection terminal line 52a is connected to the C-shaped opening. The other end of the second connection terminal line 52 a is connected to the connection terminal of the connection terminal group 41. In the heat insulation part state detection part 50, the connection terminal group 41 is arrange | positioned by the side surface side of the expansion joint 30, and each connection terminal wire protrudes from the side surface of the heat insulation part 31 to the bellows 36 side. For this reason, the wiring route between each connection terminal line and the connection terminal group 41 can be simplified. The plurality of temperature fuses are insulated by coating the outer surface with an insulating resin having heat resistance up to the vicinity of the disconnection temperature of the temperature fuse.

  The second fuse group 43, the fourth fuse group 45, and the like have basically the same configuration as the first fuse group 42, although there are differences such that the first temperature and the second temperature are different. . For example, the second fuse group 43 is formed in a C shape, the first connection terminal line 53 a is connected to the first temperature fuse 53, and the second connection terminal line 54 a is connected to the second temperature fuse 54. Yes. The fourth fuse group 45 is formed in a C-shape, and the first connection terminal line 55a is connected to the first temperature fuse 55, and the second connection terminal line 56a is connected to the second temperature fuse 56. Yes. As the material of the thermal fuse, for example, SnCu type (Sn0.7Cu: melting point 227 ° C.), SnAg type (Sn3.5Ag: melting point 221 ° C.), SnAgCu type (melting point 217 ° C.), SnAgBi type (melting point 271 ° C.), AuSn System (Au80Sn: melting point 280 ° C), AuSi system (Au6Si: melting point 370 ° C), AuGe system (Au12Ge: melting point 356 ° C), tin (melting point 232 ° C), bismuth (melting point 271 ° C), zinc (melting point 420 ° C), ZnAl (Zn6Al: melting point 382 ° C to 395 ° C, Zn15Al: melting point 382 ° C to 450 ° C), aluminum (melting point 660 ° C), duralumin (melting point 645 ° C), magnesium (melting point 650 ° C), etc. Can be used. For example, on the bellows 36 side, temperature fuses such as SnCu, SnAg, SnAgCu, SnAgBi, AuSn, AuSi, AuGe, tin and bismuth can be used, and on the exhaust side, zinc, ZnAl Thermal fuses such as aluminum, aluminum, duralumin and magnesium can be used. In the heat insulation part state detection part 50, it can be set as the tendency which is made into higher 1st temperature and 2nd temperature, so that the temperature fuse of the heat insulation layer near the exhaust is made. Here, the temperature distribution in each heat insulating material and the temperature distribution in the whole heat insulating portion 31 in the course of the gradual deterioration of each heat insulating material due to the heat of the exhaust gas are obtained experimentally or by calculation, and the heat insulating portion 31 It is assumed that a thermal fuse having an appropriately selected melting point is disposed inside each heat insulating material so as to be disconnected in order from the exhaust side to the bellows 36 side with aging.

  Next, a method for detecting the deterioration state of the heat insulating portion 31 when the expansion joint 30 is continuously used will be described. FIG. 4 is an explanatory diagram of a method for detecting the internal state of the heat insulating portion 31. In the thermal power plant 10, when the fuel is burned by the combustor 16 and the turbine 17 is driven to generate power by the generator 18, high-temperature exhaust gas flows through the first duct 22 and the second duct 24 (FIGS. 1 and 2). reference). At this time, the circulating exhaust gas is not directly blown onto the expansion joint 30 by the baffle plate 23, and a rapid temperature rise in the heat insulating portion 31 and the like is suppressed. In general, when the expansion joint 30 is continuously used, for example, the heat insulating material of the heat insulating portion 31 is hardened due to the thermal history of the aged, and is damaged by expansion and contraction due to repeated start / stop of the combustor 16. However, the insulation material may be scattered due to the flow of exhaust gas during operation of the thermal power plant. Due to such damage, the heat insulating function of the heat insulating material is lowered, and the temperature of the outer peripheral layer becomes higher. Here, as shown in FIG. 4, the deterioration state of the expansion joint 30 is detected by connecting a tester 60 to a pair of connection terminals for detecting disconnection and detecting the presence or absence of disconnection of the thermal fuse. In this expansion joint 30, first, the tester 60 is connected to the connection terminal connected via the first connection terminal line 51a to the first thermal fuse 51 (see FIG. 3) of the first heat insulating material 32 closest to the exhaust, Detect disconnection status. When a disconnection region is generated in the heat insulating portion 31, the disconnection is detected in any of the plurality of first thermal fuses 51. In FIG. 4, the disconnection detection in the fourth fuse group 45 and the disconnection region 39 in the first temperature fuse 55 are shown. At this time, it can be seen that the heat insulating function of the first heat insulating material 32 is lowered, that is, deteriorated at any position where the first thermal fuse 51 where the disconnection is detected is disposed. The location of the disconnected thermal fuse can be specified, for example, by attaching an identifier to the connection terminal. When the first temperature fuse 51 is disconnected and the second temperature fuse 52 is not disconnected, the temperature rises to the temperature at which the first temperature fuse 51 is disconnected in the disconnection region 39. It can be seen that the disconnection temperature has not been reached. At the time of disconnection of the first thermal fuse 51, since there are the second heat insulating material 33, the third heat insulating material 34, and the fourth heat insulating material 35, only the start of deterioration is grasped. Subsequently, in the next inspection, when a disconnection is detected in any of the plurality of second thermal fuses 52, it is understood that the heat insulation function of the first heat insulating material 32 in the region where the disconnection is detected is deteriorated. can do. When such inspection is repeated and, for example, the disconnection of the second thermal fuse 54 of the third heat insulating material 34 is detected, the remaining heat insulating layer is one layer. Therefore, the state of caution is set, and the inspection interval is set short again. Or When a disconnection is detected in any of the plurality of first thermal fuses 55 of the fourth heat insulating material 35, preparation for replacement of the heat insulating portion 31 is performed. Thus, the heat insulation part state detection part 50 can grasp the stepwise deterioration state of the heat insulation part 31 while grasping the approximate deterioration position in a non-destructive state.

  According to the heat insulation state detection unit 50 of the present embodiment described in detail above, the exhaust is shut off by the bellows 36 disposed between the first duct 22 and the second duct 24 through which the exhaust flows, and the bellows 36. The heat of the exhaust gas to the bellows 36 is insulated by the heat insulating part 31 disposed inside. The heat insulating portion 31 is provided with a terminal that can be electrically connected from the outside at the tip and one or more thermal fuses that are disconnected at a predetermined temperature or higher. When the expansion joint 30 is used, the terminal is electrically connected. It is possible to detect whether or not the thermal fuse is disconnected by connecting to. When the thermal fuse is not disconnected, it can be seen that the heat insulating portion 31 is not higher than the predetermined temperature, and when the thermal fuse is disconnected, it is understood that the thermal insulating portion 31 is higher than the predetermined temperature. When the temperature reaches the temperature at which the thermal fuse is disconnected, it can be seen that the function of the heat insulating portion 31 on the exhaust side from the thermal fuse is degraded. Thus, by electrically connecting from the outside, the state of the heat insulating portion 31 can be detected nondestructively. Therefore, the state of the heat insulation part 31 of the expansion joint 30 can be grasped more appropriately. For this reason, the appropriate replacement | exchange time of the heat insulation part 31 can be grasped | ascertained, and the useless replacement | exchange of the heat insulation part 31 and its replacement | work operation | work which are less than the replacement | exchange time can be suppressed further. For this reason, the fall of the operation rate of the thermal power plant 10 can be suppressed more.

  Moreover, since the heat insulation part 31 is provided with two types of temperature fuses which are disconnected at different temperatures, such as the first temperature fuse 51 and the second temperature fuse 52, for example, the stepwise temperature state of the heat insulation part 31 is detected. The deterioration state of the heat insulating part 31 can be grasped step by step. Furthermore, since the thermal fuses are arranged in all the plurality of heat insulating layers, a state in the depth direction is also obtained depending on the position of the disconnected heat insulating layer, and the progress of deterioration of each heat insulating material and the heat insulating portion 31 as a whole is obtained. It can grasp | ascertain more correctly and can grasp | ascertain the deterioration state of the heat insulation part 31 in detail. Furthermore, since the connection terminal group 41 is disposed on the side surface side of the expansion joint 30, it is easy to perform an operation of making an electrical connection to the terminal and checking for disconnection of the thermal fuse. Further, since the thermal fuse is provided in a direction orthogonal to the flow direction of the exhaust, it is easy to provide the connection terminal group 41 on the side surface side of the expansion joint 30. Since a plurality of insulated temperature fuses are provided, it is possible to suppress short-circuiting and cross-talk between the plurality of temperature fuses, and it is possible to grasp the deterioration state of the heat insulating portion 31 more accurately. In addition, since the thermal fuse is disposed so as to be disconnected in order from the exhaust side toward the bellows 36 with the deterioration of each heat insulating material, it is sufficient to detect only the disconnection of the thermal fuse on the exhaust side, The deterioration state of the heat insulating portion 31 can be grasped with a smaller detection process. Moreover, in the thermal power plant 10, the expansion joint 30 is often used, and the replacement of the heat insulating portion 31 affects the operating rate. Therefore, the significance of applying the present invention is high.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the C-shaped temperature fuse is disposed in a direction orthogonal to the flow direction of the exhaust. For example, as shown in FIG. A plurality of first fuses 155 disposed on the upper right side of the heat insulating portion 31, a plurality of second fuses 156 disposed on the lower right side of the heat insulating portion 31, a plurality of third fuses 157 disposed on the lower left side of the heat insulating portion 31, and the heat insulating portion 31. It is good also as the heat insulation part state detection part 150 provided with the fuse group 145 comprised by the some 4th fuse 158 arrange | positioned by the lower right side of this. FIG. 5 is an explanatory diagram of the heat insulation unit state detection unit 150. Each fuse is formed in a U shape that is curved along the circumferential surface of the heat insulating portion 31, and is formed so that the tip of the U shape is on the side surface side of the heat insulating portion 31. In addition, each fuse has a first connection terminal line 155a, a second connection terminal line 156a, a third connection terminal line 157a, and a fourth connection terminal line 158a connected to the tip of the U-shape, and each of the fuses is connected to a connection terminal. Is provided. In the heat insulation state detection unit 150, the connection terminals are arranged in the exhaust flow direction. In this fuse group 145, thermal fuses are stretched around a plurality of regions (upper left side, upper right side, lower left side, and lower right side) that divide the heat insulating portion 31, and each of the plurality of thermal fuses is arranged. The terminal is arranged so as to be electrically connectable from the outside. If it carries out like this, it can specify to the area | region where the heat insulation part 31 deteriorated with the position of the disconnected thermal fuse, and can grasp | ascertain the deterioration state of the heat insulation part 31 in more detail. Moreover, since the degradation part of the heat insulation part 31 can be specified, it can respond also to the partial replacement | exchange of the heat insulation part 31, etc. FIG.

  In the above-described embodiment, the thermal fuse is arranged in a direction orthogonal to the exhaust flow direction. For example, as shown in FIG. 6, the temperature fuses are arranged in a predetermined region in the exhaust flow direction. A fuse may be provided. FIG. 6 is an explanatory diagram of the heat insulation part state detection unit 250. The heat insulation state detection unit 250 includes a fuse group 245 in which a first fuse 255 and a second fuse 256 are linearly arranged. Here, both ends of the first fuse 255 become the first connection terminal line 255a, and both ends of the second fuse 256 become the second connection terminal line 256a. In this case, since one terminal can be taken from the first duct 22 side and the other terminal can be taken from the second duct 24 side, it is relatively easy to provide the terminals. Further, as shown in FIG. 7, a fuse group 345 is formed so as to be U-shaped and arranged in a predetermined region in the exhaust flow direction, and a part of the side surface of the heat insulating portion 31 is connected by connecting wires. The heat insulation part state detection unit 350 may be provided in which the connection terminal lines 355a are integrated in the region (one place). FIG. 7 is an explanatory diagram of the heat insulation part state detection unit 350. In FIG. 7, one type of thermal fuse is shown. If it carries out like this, it will be easy to arrange | position the connection terminal group 41, and it will be easy to connect the tester 60 to a connection terminal. In this heat insulation part state detection part 350, the connection terminal wire 355a arranged in a partial region of the side surface via the wiring is not adopted, and the connection terminal is arranged as it is in the outer peripheral direction of the heat insulation part 31. It is good.

  In the embodiment described above, the thermal fuses are arranged in one direction. For example, as shown in FIG. 8, a fuse group in which two or more thermal fuses are arranged so as to cross each other. It is good also as the heat insulation part state detection part 450 provided with 445. FIG. 8 is an explanatory diagram of the heat insulation part state detection unit 450. The heat insulation state detection unit 450 includes a first fuse 455 disposed obliquely and a second fuse 456 disposed obliquely so as to intersect the first fuse 455. In the heat insulation state detector 450, both ends of the first fuse 455 are first connection terminal lines 455a, and both ends of the second fuse 456 are second connection terminal lines 456a. In addition, it is assumed that an identifier terminal is recorded in a drawing or the like at an arrangement position of each thermal fuse and a connection terminal connected to each thermal fuse. As shown in the lower part of FIG. 8, when the disconnection region 39 is generated in the heat insulating portion 31, the disconnection region 39 is determined by grasping the position of the intersection between the disconnected first fuse 455 and the disconnected second fuse 456. It becomes possible to grasp where it is located. Therefore, since it is possible to detect up to the position where the thermal fuse is disconnected by the position where the thermal fuse intersects, it is possible to specify the position where the thermal insulation portion 31 has deteriorated, and it is possible to grasp a more detailed degradation state of the thermal insulation portion 31. Moreover, since the degradation part of the heat insulation part 31 can be specified, it can respond also to the partial replacement | exchange of the heat insulation part 31, etc. FIG. Here, “a plurality of two or more temperature fuses intersect” may mean that, for example, a plurality of temperature fuses are arranged in a state where one temperature fuse intersects with a plurality of temperature fuses. At this time, it is more preferable that the two or more intersecting temperature fuses are arranged in a state where they are not electrically connected. The “state of not being electrically connected” may be, for example, a state in which the surface of the electrical fuse is insulated or a shape that intersects three-dimensionally so as not to contact. In this heat insulation portion state detection unit 450, the temperature fuses are crossed obliquely, but a plurality of temperature fuses may be arranged in the direction in which the exhaust flows and the direction perpendicular to the direction in which the exhaust flows. In addition, it is good also as a heat insulation part state detection part which combined the said structure suitably.

  In the above-described embodiment, all of the plurality of heat insulating layers of the heat insulating portion 31 are provided with the thermal fuse, but may be provided in one or more layers among the plurality of heat insulating layers. From the viewpoint of protecting the bellows 36, it is preferable to provide a thermal fuse in the heat insulating layer on the bellows 36 side as much as possible. Further, in the above-described embodiment, the thermal fuse is disposed so as to be disconnected in order from the exhaust side toward the bellows 36 side with the deterioration of each heat insulating material. As long as a thermal fuse that breaks at a temperature exceeding the temperature range is disposed in the heat insulating material, it is not particularly limited to this, and the order of disconnection may be changed. Even in this case, when the thermal fuse is disconnected, it is estimated that the heat insulating material is deteriorated in the vicinity of the disconnected wire, so that the deterioration state of the heat insulating portion 31 can be grasped.

  In the above-described embodiment, one thermal insulation layer is provided with two types of thermal fuses that are disconnected at different temperatures. However, the present invention is not particularly limited thereto, and one thermal insulation layer may be disconnected at different temperatures at three or more temperatures. A fuse may be provided. In this way, the state of the more heat-insulating part 31 can be grasped. At this time, the temperature distribution in each heat insulating material and the temperature distribution in the whole heat insulating portion 31 in the course of the gradual deterioration of each heat insulating material due to the heat of the exhaust gas are empirically obtained by experiment or calculation. It is preferable that a thermal fuse with an appropriately selected melting point is disposed inside each heat insulating material so that the fuses are disconnected in order from the exhaust side toward the bellows 36 with aging. If it carries out like this, the progress state of deterioration in each heat insulating material and the heat insulation part 31 whole can be grasped | ascertained more correctly. Or it is good also as what equips one heat insulation layer with one kind of thermal fuse. In this way, the configuration can be simplified. In addition, even if it is provided with one type of thermal fuse in one thermal insulation layer, if it is provided with thermal fuses that are disconnected at different temperatures in multiple thermal insulation layers, it is possible to grasp the state of the stepwise thermal insulation part 31. it can.

  In the above-described embodiment, the connection terminal group 41 is provided on the side surface of the expansion joint 30, but the present invention is not limited to this, and the connection terminal group 41 may be provided on the side surface such as the upper surface or the lower surface.

  In the above-described embodiment, a plurality of insulated thermal fuses are provided, but they may not be insulated. At this time, it is preferable that the plurality of thermal fuses be three-dimensionally arranged so as not to be in physical contact from the viewpoint of suppressing a short circuit or a crossing of the plurality of thermal fuses.

  In the above-described embodiment, the first duct 22 is fixed to the generator 18 side and the second duct 24 is fixed to the chimney 26 side. However, the structure between the combustor 16 and the chimney 26 is described. The duct is not particularly limited as long as it is fixed to the pipe, and a plurality of expansion joints 30 may be provided.

  In the above-described embodiment, the first duct 22, the second duct 24, and the expansion joint 30 are tubular bodies. However, the present invention is not particularly limited as long as the exhaust gas can flow, and may be prismatic. However, it may be elliptical.

  In the above-described embodiment, the disconnection of the thermal fuse is detected by the tester 60. However, the detection device is not particularly limited as long as the detection device capable of detecting the electrical connection state of the thermal fuse is used. For example, the disconnection of each thermal fuse may be detected at regular or irregular timing by a data logger or the like electrically connected to each thermal fuse.

  In the above-described embodiment, the expansion joint 30 and the thermoelectric conversion / release part 40 are used for the duct through which the exhaust gas of the thermal power plant 10 is circulated. For example, in a garbage disposal plant, chemical plant factory, etc., a duct that circulates a gas such as heated exhaust or intake air, a duct that circulates a liquid such as a heated solution, a heated powder, etc. It is good also as what is applied to the duct etc. which distribute | circulate this solid.

DESCRIPTION OF SYMBOLS 10 Thermal power plant, 11 Air introduction pipe, 12 Compressor, 14 Fuel introduction pipe, 16 Combustor, 17 Turbine, 18 Generator, 22 1st duct, 22a Fixing base, 23 Baffle plate, 24 2nd duct, 24a Pedestal for fixing, 26 chimney, 30 expansion joint, 31 heat insulating part, 32 first heat insulating material, 33 second heat insulating material, 34 third heat insulating material, 35 fourth heat insulating material, 36 bellows, 37 pressure plate, 38 pressure plate, 39 Disconnection area, 41 Connection terminal group, 42 1st fuse group, 43 2nd fuse group, 45 4th fuse group, 50, 150, 250, 350, 450 Heat insulation part state detection part, 51, 53, 55 1st temperature Fuse, 51a, 53a, 55a first connection terminal line, 52, 54, 56 second temperature fuse, 52a, 54a, 56a second connection terminal line, 60 tester , 145, 245, 345, 445 fuse group, 155, 255, 455 first fuse, 155a, 255a, 455a first connection terminal line, 156, 256, 456 second fuse, 156a, 256a, 456a second connection terminal line 157 third fuse, 157a third connection terminal line, 158 fourth fuse, 158a fourth connection terminal line, 355a connection terminal line.

Claims (10)

A blocking portion which heated fluid is shut off the discharge of the arranged by fluid external to between the first duct and the second duct flowing, the blocking portion before Symbol fluid can flow state A heat insulating part that is disposed inside and insulates the heat of the fluid to the blocking part, and is provided with one or more temperature fuses that are provided with terminals that can be electrically connected from the outside and are disconnected at a predetermined temperature or higher ; connect a detection device to a terminal provided in the expansion joint with a step of detecting the presence or absence of disconnection of the temperature fuse,
A method for detecting the internal state of an expansion joint. 2. The thermal insulation part according to claim 1, wherein a first thermal fuse that breaks at a predetermined first temperature and a second thermal fuse that breaks at a second temperature that is equal to or higher than the first temperature are provided as the thermal fuse. To detect the internal state of an expansion joint. 3. The expansion joint internal state detection method according to claim 1, wherein the heat insulating portion includes a plurality of heat insulating layers, and the thermal fuse is disposed in at least two heat insulating layers. The internal state detection method of the expansion joint according to any one of claims 1 to 3, wherein the heat insulating portion is arranged so as to be stretched so that a plurality of the two or more thermal fuses intersect each other. In the heat insulating part, the temperature fuses are stretched for each of a plurality of regions dividing the heat insulating part, and terminals of the plurality of temperature fuses are disposed so as to be electrically connectable from the outside. The internal state detection method of the expansion joint of any one of Claims 1-4. 6. The expansion joint internal state detection method according to claim 1, wherein the thermal fuse is disposed so that the thermal insulation is arranged in a direction orthogonal to the fluid flow direction. 7. 6. The expansion joint internal state detection method according to claim 1, wherein the thermal fuse is arranged so that the thermal fuses are arranged in a direction in which the fluid flows. The said heat insulation part is the internal state detection method of the expansion joint of any one of Claims 1-7 by which the said terminal is arrange | positioned by the side surface side of the said expansion joint. 9. The expansion joint internal state detection method according to claim 1, wherein a plurality of insulated thermal fuses are disposed in the heat insulating portion. The heat insulating portion and the shut-off portion are a first duct fixed to the generator side so as to circulate the fluid after the fuel is burned and generated by the generator, and a chimney side that discharges the fluid The internal state detection method of the expansion joint of any one of Claims 1-9 arrange | positioned by the 2nd duct currently fixed to.

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