JP2011027190A - Expansion joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To elongate a service life of an expansion joint while suppressing degradation in energy efficiency. <P>SOLUTION: A thermoelectric conversion/release part 40 insulates exhaust heat by a heat insulation part 31, and cuts off the exhaust by bellows 36 disposed outside of the heat insulation part 31. In the thermoelectric conversion/release part 40 disposed between the heat insulation part 31 and the bellows 36, the exhaust heat is converted into electricity by a thermoelectric element layer 41 according to a temperature difference between a heat insulation part 31 side and a bellows 36 side and is released to the outside through an electric resistor 43. The thermoelectric element layer 41 is constituted as a skeleton type thermoelectric element made by bonding p-type elements and n-type elements with a soft layer, and is fixed to an inner face of the bellows 36. A heat collection layer collecting the exhaust heat and a heat transfer layer releasing the heat to the outside are disposed to the thermoelectric layer 41 to make a greater temperature difference therebetween. In this way, in the thermoelectric conversion/release part 40, a rise in temperature of the bellows 36 is alleviated without the need of a driving force. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an expansion joint, and more particularly to an expansion joint that connects between a duct through which a heated fluid passes.

  Conventionally, as an expansion joint, a turbine is driven by combustion gas obtained by mixing and combusting air compressed by a compressor and supplied fuel, and power generation is performed, and an exhaust duct that transfers discharged exhaust gas is connected. The thing is proposed (for example, refer patent document 1). In this expansion joint, a part of the air compressed by the compressor is supplied, and by cooling the expansion joint using this air, it is possible to suppress the melt damage of the expansion joint. . In addition, as an expansion joint, a water cooling jacket is formed inside the expansion joint that is interposed between the flange of one exhaust duct and the flange of the other exhaust duct, and a certain amount of cooling water is circulated inside this water cooling jacket. It has been proposed that the life of the expansion joint can be extended by cooling the expansion joint (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 11-13964 Japanese Patent Laid-Open No. 2001-21124

  By the way, in general, in an expansion joint, for example, the temperature of exhaust gas after combustion flowing through an exhaust duct may suddenly rise due to a change in the combustion state thereof. However, the expansion joints described in Patent Documents 1 and 2 do not sufficiently cope with a rapid temperature rise. In such a case, the temperature of the expansion joint rises and deterioration is further promoted. In some cases, the life of expansion joints has not been extended. Moreover, in the expansion joint mentioned above, since the air and cooling water as a refrigerant | coolant were distribute | circulated by drive of a pump etc. and always cooled, the energy loss was large.

  This invention is made | formed in view of such a subject, and it aims at providing the expansion joint which can aim at the lifetime improvement more, suppressing the fall of energy efficiency.

  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 heat insulating part disposed between the first duct and the second duct through which the heated fluid passes so that the fluid can pass therethrough to insulate the heat of the fluid passing through the first and second ducts;
A blocking portion that is disposed outside the heat insulating portion and has flexibility and blocks the fluid;
A thermoelectric conversion / discharging unit disposed between the heat insulating unit and the blocking unit and converting the heat of the fluid into electricity according to a temperature difference between the heat insulating unit side and the blocking unit side;
It is equipped with.

  In this expansion joint, the heat of the fluid is insulated by the heat insulating portion, and the fluid is blocked by the flexible blocking portion disposed on the outside of the heat insulating portion. And by the thermoelectric conversion discharge | release part arrange | positioned between the heat insulation part and the interruption | blocking part, according to the temperature difference of the heat insulation part side and the interruption | blocking part side, the heat | fever of a fluid is converted into electricity and discharge | released outside. In this way, heat from the fluid is converted into electricity and released to the outside according to the temperature difference between the heat insulation portion side and the shut-off portion side. Even when there is, it is possible to further alleviate the increase in the temperature of the blocking portion. In addition, for example, energy consumption can be further suppressed as compared with a cooling medium that is circulated to cool the blocking portion. Therefore, it is possible to further extend the life of the expansion joint while suppressing a decrease in energy efficiency. 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 thermoelectric conversion and emission part includes a thermoelectric element layer including a p-type element and an n-type element, and a resistor connected to the thermoelectric element layer so as to allow current to flow. It may be a thing. By doing so, the thermoelectric element layer converts the heat into electricity by the p-type element and the n-type element, and consumes the converted electricity by the resistor, thereby further mitigating the sudden rise in the temperature of the interrupting portion. can do.

  In the expansion joint according to the present invention, the thermoelectric conversion / release part may include a heat collection layer that collects heat of the fluid on the heat insulation part side. In this way, the heat collecting layer is used to collect heat on the heat insulating part side, and a larger temperature difference can be made between the heat insulating part side and the heat insulating part side. Can be further relaxed.

  In the expansion joint according to the present invention, the thermoelectric conversion emission part may include a skeleton type thermoelectric element layer in which the p-type element and the n-type element are arranged in a flexible layer. In this way, since the thermoelectric element layer can be made flexible and closer to the blocking portion, the temperature rise of the blocking portion can be suppressed more sufficiently, and the life of the expansion joint can be further extended. Can do.

  In the expansion joint according to the present invention, the thermoelectric conversion / release part may include a heat transfer layer that conducts heat to the outside on the blocking part side. By doing this, it is possible to transfer the heat on the blocking part side to the outside using the heat transfer layer and to promote conversion from heat to electricity with a larger temperature difference between the heat insulating part side and the blocking part side, A sudden rise in the temperature of the blocking portion can be further mitigated. At this time, the thermoelectric conversion emission part may be connected so that a heat dissipation part having a heat dissipation plate can transfer heat to the heat transfer layer. In this way, since the heat from the heat transfer layer is radiated to the outside by the heat radiating portion, a larger temperature difference can be made between the heat insulating portion side and the blocking portion side, and the rapid rise in the temperature of the blocking portion can be further alleviated. .

  Although the said thermoelectric conversion discharge | release part is good also as what is being fixed to the heat insulation part side, and good also as what is being fixed to the interruption | blocking part side, it is preferable that it is being fixed to the interruption | blocking part. By doing so, the temperature rise of the blocking portion can be suppressed more sufficiently, and it is easy to extend the life of the expansion joint.

  The expansion joint of this invention of the aspect provided with the resistor WHEREIN: The said thermoelectric conversion discharge | release part is good also as what is connected so that the thermal radiation part which has a heat sink can transfer heat to the said resistor. If it carries out like this, it will be possible to consume electricity more efficiently by a resistor, and the rapid rise of the temperature of the interruption | blocking part can be relieved more.

  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 a fluid. In so-called power generation facilities, expansion joints are often used, and therefore the significance of applying the present invention is high.

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 and the thermoelectric conversion discharge | release part 40. FIG. The block diagram which shows the outline of a structure of the thermoelectric conversion discharge | release part 40. 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 a thermoelectric conversion discharge portion 40, and FIG. FIG. 3 is a configuration diagram showing an outline of a configuration of a thermoelectric conversion / release part 40. 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 into 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, a bellows 36 that is disposed outside the heat insulating portion 31 and has flexibility and blocks the exhaust, and the heat insulating portion 31 and the bellows 36. And a thermoelectric conversion emission part 40 disposed between the two. 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.

  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. For example, as shown in FIG. 3, the bellows 36 includes, in order from the inside, exhaust side layers 36a and 36b, which are a composite material of a fluororesin layer sheet and a glass fiber cloth, and an intermediate layer 36c, which is a glass fiber cloth. And an outer layer 36d, which is a glass fiber cloth containing stainless steel wire, the inner side being a corrosion-resistant layer and the outer side being constituted by a layer imparting mechanical strength. 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.

The thermoelectric conversion / release part 40 converts the heat of the exhaust into electricity according to the temperature difference between the heat insulation part 31 side and the bellows 36 side and discharges it to the outside, and is fixed to the inner surface of the bellows 36. . As shown in FIG. 3, the thermoelectric conversion emission part 40 includes a thermoelectric element layer 41 having a thermoelectric conversion element, a first heat radiating part 42 connected to the thermoelectric element layer 41 so as to be able to conduct heat, a thermoelectric element layer 41, and On the surface of the thermoelectric element layer 41 on the bellows 36 side, the electric resistor 43 connected to be energized, the heat collecting layer 48 that is disposed on the surface of the thermoelectric element layer 41 on the heat insulating portion 31 side, and collects the heat of the exhaust. And a heat transfer layer 49 that conducts heat to the outside. The thermoelectric element layer 41 includes a flexible layer 47 in which a central portion in the axial direction of the plurality of columnar p-type elements 45 and a central portion in the axial direction of the plurality of columnar n-type elements 46 are flexible resin layers. It is configured as a skeleton type thermoelectric element having a structure bound to each other. In the thermoelectric element layer 41, p-type elements 45 and n-type elements 46 are alternately arranged. The p-type elements 45 and the n-type elements 46 are alternately electrically connected in series by electrodes (not shown). It is connected to the. The thermoelectric element layer 41 includes a p-type element 45 and an n-type element 46 so that current flows to the electric resistor 43 when the surface on the heat insulating portion 31 side becomes a high-temperature surface and the surface on the bellows 36 side becomes a low-temperature surface. Are connected so that they can be energized. Further, the thermoelectric element layer 41 has a structure in which a central portion in the axial direction of the columnar p-type element 45 and a central portion in the axial direction of the columnar n-type element 46 are bundled by a flexible layer 47 of a resin layer having flexibility. It can be bent according to the curve of the bellows 36. For this reason, the thermoelectric element layer 41 and the bellows 36 are difficult to peel off. As the p-type element 45, for example, one or more selected from BiSbTe-based (telluride-based), MnSi-based (silicide-based), NaCo ₂ O ₄ (oxide-based), and the like can be used. As the n-type element 46, one or more selected from BiTe (telluride) and MgSi (silicide) can be used.

  The heat collection layer 48 disposed on the high temperature surface of the thermoelectric element layer 41 is a layer that collects the heat of the exhaust, and is selected from materials having high thermal conductivity, such as aluminum, platinum, silver, stainless steel, copper, and the like. Preferably, it is formed as one or more foils. The heat collection layer 48 is preferably made of a material having high thermal conductivity, and aluminum is preferred. The heat transfer layer 49 disposed on the low-temperature surface of the thermoelectric element layer 41 is a layer that conducts heat to the outside, and has a high thermal conductivity, such as aluminum, platinum, silver, stainless steel, copper, and the like. It is preferably formed of one or more foils selected from. The heat transfer layer 49 is preferably made of a material having high corrosion resistance, and preferably aluminum. A first heat radiating portion 42 having a heat radiating plate is connected to the heat transfer layer 49 so as to be able to transfer heat, and the first heat radiating portion 42 releases heat to the outside to further cool the low temperature surface of the thermoelectric element layer 41. To do. The heat collection layer 48 and the heat transfer layer 49 are fixed to the high-temperature surface and the low-temperature surface of the thermoelectric element layer 41 with heat-resistant solder such as SnSb (melting point 232 ° C.) or AuSn (melting point 280 ° C.). The electrical resistor 43 is connected to the terminal of the p-type element 45 and the terminal of the n-type element 46 and converts the current generated in the thermoelectric element layer 41 into heat again, and has a second heat radiating portion 44 having a heat radiating plate. Are connected so that heat can be transferred.

  Next, the change of the state of the expansion joint 30 and the thermoelectric conversion discharge | release part 40 when high temperature exhaust_gas | exhaustion distribute | circulates the 1st duct 22 and the 2nd duct 24 is demonstrated using FIGS. When fuel is burned in the combustor 16 of the thermal power plant 10 to drive the turbine 17 and generate power with the generator 18, high-temperature exhaust flows through the first duct 22 and the second duct 24 (see FIGS. 1 and 2). ). 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 addition, the bellows 36 is pressed outward and swelled by the exhaust gas whose temperature is reduced by each layer of the heat insulating part 31 and the thermoelectric conversion emitting part 40. At this time, the heat collection layer 48 collects the heat of the exhaust, and the heat transfer layer 49 radiates heat through the first heat radiating portion 42 and the bellows 36, so that the surface of the thermoelectric element layer 41 on the heat insulating portion 31 side (high temperature Temperature) and a surface on the bellows 36 side (low temperature surface). The thermoelectric element layer 41 converts the heat of the exhaust gas into a current according to the temperature difference, and the converted current flows through the electric resistor 43. In the electrical resistor 43, this current is further converted into heat and radiated through the second heat radiating portion 44. In this way, the heat transfer to the bellows 36 is mitigated by converting the heat of the exhaust gas into electricity by the thermoelectric conversion and emission part 40 and releasing it to the outside. In particular, depending on the combustion state in the combustor 16, it is considered that the exhaust temperature rapidly rises and the thermal degradation of the bellows 36 is promoted, but the temperature difference between the high temperature surface and the low temperature surface of the thermoelectric element layer 41 is large. Thus, since the conversion to the current in the thermoelectric element layer 41 is increased, a high relaxation effect of heat transfer to the bellows 36 is obtained. Here, the general expansion joint which does not have the thermoelectric conversion discharge | release part 40 is demonstrated. In general, when the expansion joint is used continuously, for example, the heat insulation material is hardened due to the thermal history of the aged, and is damaged due to the expansion and contraction due to the periodic start / stop of the combustor. Insulation material may scatter due to the flow of exhaust during operation. It is considered that high-temperature exhaust gas enters the gap generated by such damage, eventually reaches the bellows, and the bellows deteriorates. In particular, it is considered that the thermal deterioration of the bellows is greatly promoted when the temperature of the exhaust gas from the combustor increases rapidly. In the expansion joint 30 of the present embodiment, the thermoelectric conversion / release part 40 converts heat into electricity according to the temperature difference between the surface on the heat insulating part 31 side and the surface on the bellows 36 side, and releases it to the outside. The thermal degradation of the bellows 36 can be further suppressed without requiring a driving force.

  According to the thermoelectric conversion emission part 40 of this embodiment explained in full detail above, the heat | fever of exhaust_gas | exhaustion is thermally insulated by the heat insulation part 31, and exhaust_gas | exhaustion is interrupted | blocked by the bellows 36 which has the softness | flexibility arrange | positioned on the outer side of the heat insulation part 31. And by the thermoelectric conversion discharge | release part 40 arrange | positioned between the heat insulation part 31 and the bellows 36, according to the temperature difference of the heat insulation part 31 side and the bellows 36 side, the heat | fever of exhaust_gas | exhaustion is converted into electricity, and it is outside. discharge. Thus, since the heat from the exhaust is converted into electricity and released to the outside in accordance with the temperature difference between the heat insulating portion 31 side and the bellows 36 side, not only the exhaust temperature in the steady state but also the rapid temperature Even when there is an increase, the temperature of the bellows 36 can be further reduced. Further, for example, energy consumption can be further suppressed as compared with the cooling of the bellows 36 by circulating the cooling medium. Therefore, it is possible to further extend the life of the expansion joint 30 while suppressing a decrease in energy efficiency.

  Further, the p-type element 45 and the n-type element 46 convert heat to electricity by the thermoelectric element layer 41, and the converted electricity is consumed by the electric resistor 43, so that the temperature of the bellows 36 rapidly increases. Can be more relaxed. Furthermore, since the heat collection layer 48 is used to collect heat on the heat insulating portion 31 side and a larger temperature difference can be obtained between the heat insulating portion 31 side and the bellows 36 side, the temperature of the bellows 36 is rapidly increased. The rise can be further mitigated. Furthermore, since the p-type element 45 and the n-type element 46 include the skeleton-type thermoelectric element layer 41 disposed on the flexible layer 47, the thermoelectric element layer 41 is made closer to the bellows 36 as being flexible. The temperature rise of the bellows 36 can be suppressed more sufficiently, and the life of the expansion joint 30 can be further extended. And since it is possible to transfer the heat on the bellows 36 side to the outside by using the heat transfer layer 49 to make a larger temperature difference between the heat insulating portion 31 side and the bellows 36 side, it is possible to promote conversion from heat to electricity. The rapid increase in the temperature of the bellows 36 can be further mitigated. In addition, since the heat from the heat transfer layer 49 is radiated to the outside by the first heat radiating portion 42, the temperature difference between the heat insulating portion 31 side and the bellows 36 side is further increased, and the rapid rise in the temperature of the bellows 36 is further alleviated. can do. Furthermore, since the thermoelectric conversion / release part 40 is fixed to the bellows 36, the temperature rise of the bellows 36 can be more sufficiently suppressed, and the life of the expansion joint 30 can be easily extended. Furthermore, since the second heat radiating portion 44 is connected to the electric resistor 43 so as to be able to transfer heat, the electric resistor 43 can consume electricity more efficiently, and the temperature of the bellows 36 can be reduced. Can be alleviated more rapidly. Moreover, in the thermal power plant 10, since the expansion joint 30 is often used, 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 embodiment described above, the heat collection layer 48 is disposed on the thermoelectric element layer 41, but this may be omitted. Even in this case, since a temperature difference can occur between the high temperature surface and the low temperature surface of the thermoelectric element layer 41, it is possible to further extend the life of the expansion joint 30 while suppressing a decrease in energy efficiency by the thermoelectric element layer 41. In addition, although the heat transfer layer 49 is disposed on the thermoelectric element layer 41, this may be omitted. Even in this case, since a temperature difference can occur between the high temperature surface and the low temperature surface of the thermoelectric element layer 41, the life of the expansion joint 30 can be further extended while suppressing a decrease in energy efficiency. Moreover, although the 1st thermal radiation part 42 shall be connected to the heat-transfer layer 49, this may be abbreviate | omitted. Even in this case, since a temperature difference can occur between the high temperature surface and the low temperature surface of the thermoelectric element layer 41, the life of the expansion joint 30 can be further extended while suppressing a decrease in energy efficiency. Moreover, although the 2nd thermal radiation part 44 shall be connected to the electrical resistor 43, you may abbreviate | omit this. Even in this case, since the electric resistor 43 can convert the current into heat, the life of the expansion joint 30 can be further extended while suppressing the decrease in energy efficiency.

  In the embodiment described above, the thermoelectric element layer 41 is bound at the center of the p-type element 45 and the n-type element 46 by the flexible layer 47, but is not particularly limited thereto, and in addition to or in place of this. The p-type element 45 and the n-type element 46 may be bent by fixing the heat-resistant flexible layer to the high-temperature surface, or the p-type element 45 and the n-type element 46 may be fixed to the low-temperature surface. It is good also as what can be bent by doing.

  In the embodiment described above, the thermoelectric element layer 41 has a skeleton type configuration, but converts the heat of the exhaust gas into electricity according to the temperature difference between the heat insulating portion 31 side and the bellows 36 side and releases it to the outside. However, the present invention is not particularly limited to this, and a ceramic substrate fixed on at least one of the high temperature surface and the low temperature surface may be used. In this case, although it is inferior in flexibility, it is possible to suppress the transfer of exhaust heat to the bellows 36 side, so that the life of the expansion joint 30 can be further increased. In addition, when using the thermoelectric element layer which has a board | substrate, it is preferable to make it possible to bend as much as possible by making it a unit as small as possible and connecting this unit with a flexible layer.

  In the above-described embodiment, the thermoelectric conversion / release portion 40 is fixed to the bellows 36. However, if the thermoelectric conversion / release portion 40 is disposed between the heat insulating portion 31 and the bellows 36, the embodiment is not particularly limited thereto. It is good also as what fixes to the heat insulation part 31. FIG. Even in this case, since the transmission of exhaust heat to the bellows 36 side can be suppressed, the life of the expansion joint 30 can be further extended.

  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 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, 36a, 36b exhaust side layer, 36c Intermediate layer, 36d outer layer, 37, 38 holding plate, 40 thermoelectric conversion emission part, 41 thermoelectric element layer, 42 first heat radiation part, 43 electric resistor, 44 second heat radiation part, 45 p-type element, 46 n-type element 47 flexible layers, 48 heat collection layers, 49 heat transfer layers.

Claims (9)

A heat insulating part disposed between the first duct and the second duct through which the heated fluid passes so that the fluid can pass therethrough to insulate the heat of the fluid passing through the first and second ducts;
A blocking portion that is disposed outside the heat insulating portion and has flexibility and blocks the fluid;
A thermoelectric conversion / discharging unit disposed between the heat insulating unit and the blocking unit and converting the heat of the fluid into electricity according to a temperature difference between the heat insulating unit side and the blocking unit side;
Expansion joint with   The thermoelectric conversion emission part is provided with the thermoelectric element layer comprised by the p-type element and the n-type element, and the resistor connected so that electricity could be supplied to this thermoelectric element layer. Expansion joints.   The expansion joint according to claim 1, wherein the thermoelectric conversion discharge part includes a heat collection layer that collects heat of the fluid on the heat insulation part side.   The expansion joint according to any one of claims 1 to 3, wherein the thermoelectric conversion emission part includes a skeleton-type thermoelectric element layer in which the p-type element and the n-type element are arranged in a flexible layer. .   The expansion joint according to any one of claims 1 to 4, wherein the thermoelectric conversion / release part includes a heat transfer layer that conducts heat to the outside on the blocking part side.   The expansion joint according to claim 5, wherein the thermoelectric conversion / release part is connected such that a heat radiating part having a heat radiating plate can transfer heat to the heat transfer layer.   The expansion joint according to any one of claims 1 to 6, wherein the thermoelectric conversion / release part is fixed to the blocking part.   The expansion joint according to claim 2, wherein the thermoelectric conversion and emission part is connected so that a heat dissipation part having a heat dissipation plate can transfer heat to the resistor.   The heat insulating portion and the shut-off portion are provided on the first duct fixed to the generator side so as to circulate the fluid after the fuel is burned and generated by the generator, and on the chimney side that discharges the fluid. The expansion joint according to any one of claims 1 to 8, wherein the expansion joint is disposed on a second duct that is fixed.

Images