Heat exchanger, high-temperature gas furnace system and method of manufacturing heat exchanger

Abstract

To keep devices compact in size in relation to a heat exchanger and a high-temperature gas furnace, and in a method of manufacturing a heat exchanger.SOLUTION: A heat exchanger comprises: a first heat exchanger core in which high-temperature heat medium flow passages HF and low-temperature heat medium flow passages LF running along a horizontal direction are alternately provided in a vertical direction; a second heat exchanger core in which high-temperature heat medium flow passages and low-temperature heat medium flow passages running along the horizontal direction are alternately provided in the vertical direction, above the first heat exchanger core in the vertical direction; a high-temperature side supply header 52 arranged on one side in the horizontal direction with respect to the first heat exchanger core and the second heat exchanger core; a low-temperature side supply header 53 arranged on the other side in the horizontal direction; a high-temperature side communication pipe 67 connecting the high-temperature side header with supply parts of the plurality of high-temperature heat medium flow passages; and a low-temperature side communication pipe 68 connecting the low-temperature side supply header with supply parts of the plurality of low-temperature heat medium flow passages. A position of connection of the supply parts 63 of the high-temperature heat medium flow passages and the high-temperature side communication pipe in the vertical direction is set in accordance to an amount of thermal elongation of the high-temperature side supply header in the vertical direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a heat exchanger, a high temperature gas reactor system, and a method for manufacturing a heat exchanger. [Background technology]

[0002] The stacked heat exchanger is configured by stacking multiple heat exchanger cores vertically. The heat exchanger core is configured, for example, by alternately arranging high-temperature heat medium flow paths and low-temperature heat medium flow paths between multiple plates, with a high-temperature heat medium supply section where multiple high-temperature heat medium flow paths are gathered on one side, and a low-temperature heat medium supply section where multiple low-temperature heat medium flow paths are gathered on the other side. The stacked heat exchanger is configured by stacking multiple heat exchanger cores vertically, with a high-temperature heat medium supply header connected to the high-temperature heat medium supply section of each heat exchanger core via multiple connecting pipes, and a low-temperature heat medium supply header connected to the low-temperature heat medium supply section of each heat exchanger core via multiple connecting pipes. An example of such a stacked heat exchanger is described in Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-178092 A Summary of the Invention [Problem to be solved by the invention]

[0004] The high-temperature heat medium is supplied from the high-temperature side supply header to the high-temperature heat medium supply section through the connecting pipe, and flows from the high-temperature heat medium supply section to each high-temperature heat medium flow path. On the other hand, the low-temperature heat medium is supplied from the low-temperature side supply header to the low-temperature heat medium supply section through the connecting pipe, and flows from the low-temperature heat medium supply section to each low-temperature heat medium flow path. Then, heat exchange is performed between the high-temperature heat medium flowing through the high-temperature heat medium flow path and the low-temperature heat medium flowing through the low-temperature heat medium flow path. Here, the high-temperature heat medium supply header and the high-temperature heat medium supply section have a large amount of thermal expansion in the vertical direction because the high-temperature heat medium flows through them. The high-temperature heat medium supply header and the high-temperature heat medium supply section are connected by a connecting pipe, but the amount of thermal expansion differs between the high-temperature heat medium supply header and the high-temperature heat medium supply section. Therefore, in order to absorb the difference in the amount of thermal expansion between the high-temperature heat medium supply header and the high-temperature heat medium supply section, it is necessary to increase the length of the connecting pipe. Then, there is a problem that the occupied volume of the heat exchanger including the multiple connecting pipes increases, leading to an increase in the size of the device.

[0005] The present disclosure is devised to solve the above-mentioned problems, and has an object to provide a heat exchanger and a high-temperature gas reactor system, and a method for manufacturing a heat exchanger, which make it possible to prevent the device from becoming large. [Means for solving the problem]

[0006] In order to achieve the above object, the heat exchanger of the present disclosure includes a container, a first support plate arranged horizontally inside the container, a first heat exchanger core arranged on the first support plate and having high-temperature heat medium flow paths and low-temperature heat medium flow paths arranged horizontally and alternately arranged vertically, a second support plate arranged horizontally above the first support plate inside the container, a second heat exchanger core arranged on the second support plate and having high-temperature heat medium flow paths and low-temperature heat medium flow paths arranged horizontally and alternately arranged vertically, and a heat exchanger core and a heat exchanger core for the first heat exchanger core and the second heat exchanger core. a high-temperature side supply header arranged on one side in the horizontal direction with respect to the first heat exchanger core and the second heat exchanger core, a low-temperature side supply header arranged on the other side in the horizontal direction with respect to the first heat exchanger core and the second heat exchanger core, a high-temperature side communication pipe connecting the high-temperature side supply header to supply portions of the plurality of high-temperature heat medium flow paths, and a low-temperature side communication pipe connecting the low-temperature side supply header to supply portions of the plurality of low-temperature heat medium flow paths, wherein a vertical connection position between the supply portions of the high-temperature heat medium flow paths and the high-temperature side communication pipe is set according to an amount of thermal expansion of the high-temperature side supply header in the vertical direction.

[0007] In addition, the high-temperature gas reactor system disclosed herein comprises a high-temperature gas reactor that extracts heat generated by nuclear fission to the outside using helium gas, an intermediate heat utilization device that utilizes the high-temperature helium gas discharged from the high-temperature gas reactor, and a regenerative heat exchanger that exchanges heat between the high-temperature helium gas discharged from the intermediate heat utilization device and the low-temperature helium gas, and the heat exchanger is used as the regenerative heat exchanger.

[0008] The present disclosure also provides a method for manufacturing a heat exchanger, comprising: a container; a first support plate arranged horizontally inside the container; a first heat exchanger core arranged on the first support plate and having high-temperature heat medium flow paths and low-temperature heat medium flow paths arranged horizontally and alternately arranged in the vertical direction; a second support plate arranged horizontally above the first support plate inside the container; a second heat exchanger core arranged on the second support plate and having high-temperature heat medium flow paths and low-temperature heat medium flow paths arranged horizontally and alternately arranged in the vertical direction; In a heat exchanger comprising a high-temperature side supply header arranged on one side in a horizontal direction, a low-temperature side supply header arranged on the other side in the horizontal direction relative to the first heat exchanger core and the second heat exchanger core, a high-temperature side connecting pipe connecting the high-temperature side supply header to the supply portions of a plurality of the high-temperature heat medium flow paths, and a low-temperature side connecting pipe connecting the low-temperature side supply header to the supply portions of the plurality of the low-temperature heat medium flow paths, a vertical connection position between the supply portions of the high-temperature heat medium flow paths and the high-temperature side connecting pipe is set according to an amount of thermal expansion in the vertical direction of the high-temperature side supply header. Effect of the Invention

[0009] According to the heat exchanger, high-temperature gas reactor system, and method for manufacturing a heat exchanger disclosed herein, it is possible to prevent the device from becoming large. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing a high temperature gas reactor system according to this embodiment. [Diagram 2] FIG. 2 is a side view showing the regenerative heat exchanger of the present embodiment. [Diagram 3] FIG. 3 is a plan view showing the regenerative heat exchanger. [Figure 4] FIG. 4 is a schematic diagram for explaining the operation of the regenerative heat exchanger of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes a configuration in which each embodiment is combined. In addition, the components in the embodiments include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range.

[0012] <High-Temperature Gas-Cooled Reactor System> FIG. 1 is a schematic diagram showing a high temperature gas reactor system according to this embodiment.

[0013] As shown in FIG. 1, a high temperature gas reactor system 10 includes a high temperature gas reactor 11, an intermediate heat exchanger 12, a gas turbine power generation system 13, and a regenerative heat exchanger 14.

[0014] The high temperature gas reactor 11 is a nuclear reactor that uses helium gas as a coolant to extract heat generated by nuclear fission to the outside. The high temperature gas reactor 11 is configured by accommodating a reactor core (nuclear fuel) 22 inside a reactor vessel 21. The reactor vessel 21 is provided with an inlet section 23 and an outlet section 24. Helium gas is supplied to the reactor vessel 21 from the inlet section 23, rises along the inner wall of the reactor vessel 21, and descends through the reactor core 22. The helium gas is heated to a high temperature as it passes through the core 22, and is discharged to the outside of the reactor vessel 21 from the outlet section 24.

[0015] The intermediate heat exchanger 12 is configured by accommodating a heat exchange section 26 inside a pressure vessel 25. The pressure vessel 25 is provided with an inlet section 27 and an outlet section 28, and the inlet section 27 is connected to the outlet section 24 of the reactor vessel 21 in the high temperature gas reactor 11 via a pipe 29. The pressure vessel 25 is also provided with a supply section 30 that supplies a heat medium to the heat exchange section 26, and a discharge section 31 that discharges the heat medium from the heat exchange section 26. Helium gas is supplied to the pressure vessel 25 from the inlet section 27, and the heat medium is supplied to the heat exchange section 26 from the supply section 30. The heat exchange section 26 exchanges heat between the high-temperature helium gas and the heat medium. The helium gas whose temperature has been reduced by the heat exchange is discharged from the outlet section 28 to the outside of the pressure vessel 25. On the other hand, the heat medium whose temperature has been increased by the heat exchange is discharged from the discharge section 31 to the outside of the pressure vessel 25.

[0016] The gas turbine power generation system 13 has a gas turbine 32 and a generator 33. The gas turbine 32 has a turbine 34 and a compressor 35. The turbine 34 and the compressor 35 can rotate together by a rotating shaft 36. The generator 33 is connected to one end of the rotating shaft 36 in the axial direction. In the gas turbine power generation system 13, a pipe 37 from the intermediate heat exchanger 12 is connected to the gas turbine 32. Helium gas is supplied to the turbine 34 of the gas turbine 32. The turbine 34 is driven by the supplied helium gas to rotate the rotating shaft 36. The generator 33 obtains driving force from the rotating shaft 36 to generate electricity.

[0017] The regenerative heat exchanger 14 is configured by accommodating a heat exchange section 42 and a cooling section 43 inside a pressure vessel 41. The pressure vessel 41 has a vertical shape, with the heat exchange section 42 arranged at the top and the cooling section 43 arranged at the bottom. The pressure vessel 41 is provided with an inlet section 44 and an outlet section 45, the inlet section 44 is connected to the gas turbine power generation system 13 via a pipe 46, and the outlet section 45 is connected to the inlet section 23 of the reactor vessel 21 in the high temperature gas reactor 11 via a pipe 47. Helium gas is supplied from the inlet section 44 to the pressure vessel 41 and supplied to the heat exchange section 42. The helium gas is supplied to the cooling section 43 of the heat exchange section 42 and cooled, and then supplied to the heat exchange section 42 again. The heat exchange section 42 exchanges heat between the helium gas supplied from the gas turbine power generation system 13 and the helium cooled in the cooling section 43. The helium gas whose temperature has increased by the heat exchange is discharged to the outside of the pressure vessel 41 through the outlet 45 and returned to the high-temperature gas reactor 11 .

[0018] <Regenerative heat exchanger> FIG. 2 is a side view showing the regenerative heat exchanger of this embodiment, and FIG. 3 is a plan view showing the regenerative heat exchanger.

[0019] 2 and 3, the regenerative heat exchanger 14 is composed of the above-mentioned heat exchange section (heat exchanger) 42. The heat exchange section 42 has a pressure vessel 41, a plurality of (three in this embodiment) heat exchanger cores 51, a high-temperature side supply header 52, a low-temperature side supply header 53, and a low-temperature side discharge header 54.

[0020] An inner cylinder 60 is disposed inside the pressure vessel 41. The inner cylinder 60 is disposed inside the pressure vessel 41 with a gap between it and the inner wall surface of the pressure vessel 41. The lower support plate (first support plate) 61 is disposed along the horizontal direction, and its outer periphery is fixed to and supported by the inner wall surface of the pressure vessel 41. A plurality of intermediate support plates (second support plates) 62 are disposed along the horizontal direction vertically above the lower support plate 61. The lower end of the inner cylinder 60 is installed on the lower support plate 61. The intermediate support plate 62 is supported by its outer periphery being fixed to the inner wall surface of the inner cylinder 60. The vertical distance between the lower support plate 61 of the first stage (lowest stage) and the intermediate support plate 62 of the second stage is set to be greater than the height of the heat exchanger core 51. The vertical distance between the intermediate support plate 62 of the second stage and the intermediate support plate 62 of the third stage is set to be greater than the height of the heat exchanger core 51.

[0021] The heat exchanger cores 51 are stacked vertically by being placed on the lower support plate 61 and the intermediate support plate 62. A vertical gap is secured between the heat exchanger core (first heat exchanger core) 51 placed on the lower support plate 61 and the lower surface of the intermediate support plate 62. This gap is set to a length such that the heat exchanger core 51 does not come into contact with the lower surface of the intermediate support plate 62 even if it expands due to heat. In addition, a vertical gap is secured between the heat exchanger core (second heat exchanger core) 51 placed on the second-stage intermediate support plate 62 and the lower surface of the third-stage intermediate support plate 62. This gap is set to a length such that the heat exchanger core 51 does not come into contact with the lower surface of the intermediate support plate 62 even if it expands due to heat.

[0022] The heat exchanger cores 51 have the same shape. The heat exchanger core 51 is configured, for example, by arranging fins between a plurality of plates. In the heat exchanger core 51, a high-temperature flow path HF and a low-temperature flow path LF are configured by the fins sandwiched between the plates. The number of stacked stages of the heat exchanger cores 51 is not limited to three stages, but is appropriately set depending on the performance of the heat exchange section 42, etc. Although one heat exchanger core 51 is placed on the lower support plate 61 and the middle support plate 62, a plurality of heat exchanger cores 51 may be stacked and placed.

[0023] The heat exchanger core 51 is provided with a plurality of high temperature flow paths HF and low temperature flow paths LF arranged alternately in the vertical direction along the horizontal direction. The heat exchanger core 51 is provided with a high temperature supply section 63 on one horizontal side, and a high temperature discharge section 64 on the other horizontal side. The heat exchanger core 51 is also provided with a low temperature supply section 65 on the other horizontal side, and a low temperature discharge section 66 on one horizontal side. That is, the heat exchanger core 51 has a hexagonal shape in a plan view, and the high temperature supply section 63 and the low temperature discharge section 66 are provided side by side on one horizontal side, and the high temperature discharge section 64 and the low temperature supply section 65 are provided side by side on the other horizontal side.

[0024] The high temperature supply unit 63 communicates with one end of the multiple high temperature flow paths HF, and the high temperature discharge unit 64 is configured by opening the other end of the multiple high temperature flow paths HF. The low temperature supply unit 65 communicates with the other end of the multiple low temperature flow paths LF, and the low temperature discharge unit 66 communicates with one other end of the multiple low temperature flow paths LF.

[0025] The high-temperature side supply header 52 is a pipe along the vertical direction, the lower end of which is connected to the inlet 44 (see FIG. 1) of the pressure vessel 41, and the upper end of which is closed. The high-temperature side supply header 52 is connected by penetrating the lower support plate 61. The high-temperature side supply header 52 also penetrates the through holes 62a of the multiple intermediate support plates 62 with gaps therebetween, and is therefore movable vertically relative to the intermediate support plates 62. In other words, the high-temperature side supply header 52 is supported by being restrained only by the lower support plate 61. The high-temperature side supply header 52 has a heat insulating material (heat insulating layer) 52a attached to its inner surface. The high-temperature side supply header 52 is connected to each high-temperature supply section 63 of the multiple heat exchanger cores 51 via multiple communication pipes (high-temperature side communication pipes) 67.

[0026] The low-temperature side supply header 53 is a pipe along the vertical direction, with its lower end connected to the outer flow passage and its upper end closed. The low-temperature side supply header 53 is connected by penetrating the lower support plate 61. The low-temperature side supply header 53 is also connected by penetrating multiple intermediate support plates 62. In other words, the low-temperature side supply header 53 is restrained and supported by the lower support plate 61 and the multiple intermediate support plates 62. The low-temperature side supply header 53 has no insulating material attached to its inner surface. The low-temperature side supply header 53 is connected to each of the low-temperature supply sections 65 of the multiple heat exchanger cores 51 via multiple connection pipes (low-temperature side connection pipes) 68.

[0027] The low-temperature side discharge header 54 is a pipe extending in the vertical direction, the lower end of which is connected to the outlet 45 (see FIG. 1) of the pressure vessel 41, and the upper end of which is closed. The low-temperature side discharge header 54 is connected by penetrating the lower support plate 61. The low-temperature side discharge header 54 also penetrates the through holes 62b of the multiple intermediate support plates 62 with gaps therebetween, and is therefore movable vertically relative to the intermediate support plates 62. In other words, the low-temperature side discharge header 54 is supported by being restrained only by the lower support plate 61. The low-temperature side discharge header 54 has a (thermal insulation layer) 54a attached to its inner surface. The low-temperature side discharge header 54 is connected to each of the low-temperature discharge sections 66 of the multiple heat exchanger cores 51 via multiple connection pipes 69.

[0028] Therefore, the high-temperature helium gas H1 (e.g., 600°C) supplied to the high-temperature side supply header 52 is supplied from each connecting pipe 67 to the high-temperature supply section 63 and flows through each high-temperature flow path HF. The low-temperature helium gas H11 (e.g., 300°C) supplied to the low-temperature side supply header 53 is supplied from each connecting pipe 68 to the low-temperature supply section 65 and flows through each low-temperature flow path LF. The heat exchanger core 51 exchanges heat between the high-temperature helium gas H1 flowing through the high-temperature flow path HF and the low-temperature helium gas H11 flowing through the low-temperature flow path LF. The high-temperature helium gas H2 (e.g., 300°C) whose temperature has been reduced by flowing through the high-temperature flow path HF is discharged from the high-temperature discharge section 64 into the pressure vessel 41 and is supplied to the cooling section 43 (see FIG. 1). On the other hand, the low-temperature helium gas H12 (eg, 600° C.) whose temperature has increased by flowing through the low-temperature flow path LF is supplied to the low-temperature discharge section 66 and then supplied from each connecting pipe 69 to the low-temperature side discharge header 54.

[0029] A high-temperature side discharge header may be provided and connected to each of the high-temperature discharge sections 64 of the multiple heat exchanger cores 51 via multiple connecting pipes. In this case, it is preferable that the high-temperature side discharge header has a support structure similar to that of the low-temperature side supply header 53.

[0030] <Communication Pipe> The high-temperature helium gas H1 is supplied from the high-temperature side supply header 52 to the high-temperature supply section 63 through the connecting pipe 67, and flows from the high-temperature supply section 63 to each high-temperature flow path HF. On the other hand, the low-temperature helium gas H11 is supplied from the low-temperature side supply header 53 to the low-temperature supply section 65 through the connecting pipe 68, and flows from the low-temperature supply section 65 to each low-temperature flow path LF. Then, heat exchange is performed between the high-temperature helium gas H1 flowing through the high-temperature flow path HF and the low-temperature helium gas H11 flowing through the low-temperature flow path LF. The helium gas H1, whose temperature has been reduced by the heat exchange, is discharged from the high-temperature discharge section 64, and the helium gas H11, whose temperature has been increased by the heat exchange, is discharged from the low-temperature discharge section 66 to the low-temperature side discharge header 54.

[0031] Therefore, in the heat exchange section 42, the high-temperature helium gases H1 and H12 flow on one side (the left side in Figs. 2 and 3), so that the thermal expansion in the vertical direction is large in the high-temperature supply header 52, the high-temperature supply section 63, the low-temperature discharge header 54, and the low-temperature discharge section 66. The high-temperature supply header 52 and the high-temperature supply section 63 are connected by a connecting pipe 67, and the low-temperature discharge header 54 and the low-temperature discharge section 66 are connected by a connecting pipe 69. In this case, the thermal expansion in the vertical direction differs between the high-temperature supply header 52 and the high-temperature supply section 63, and the thermal expansion in the vertical direction differs between the low-temperature discharge header 54 and the low-temperature discharge section 66. Therefore, in order to absorb the difference in the thermal expansion between the two, it becomes necessary to increase the length of the connecting pipes 67 and 69.

[0032] Therefore, in this embodiment, the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 is set according to the amount of thermal expansion in the vertical direction of the high-temperature side supply header 52. Also, the vertical connection position between the low-temperature discharge section 66 and the connecting pipe 69 is set according to the amount of thermal expansion in the vertical direction of the low-temperature side discharge header 54.

[0033] Specifically, the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 in the heat exchanger core 51 arranged on the second-stage intermediate support plate 62 is set above the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 in the heat exchanger core 51 arranged on the first-stage lower support plate 61. Also, the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 in the heat exchanger core 51 arranged on the third-stage intermediate support plate 62 is set above the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 in the heat exchanger core 51 arranged on the second-stage intermediate support plate 62.

[0034] Furthermore, the vertical connection position between the low-temperature discharge section 66 and the connecting pipe 69 in the heat exchanger core 51 arranged on the second-stage intermediate support plate 62 is set above the vertical connection position between the low-temperature discharge section 66 and the connecting pipe 69 in the heat exchanger core 51 arranged on the first-stage lower support plate 61. Moreover, the vertical connection position between the low-temperature discharge section 66 and the connecting pipe 69 in the heat exchanger core 51 arranged on the third-stage intermediate support plate 62 is set above the vertical connection position between the low-temperature discharge section 66 and the connecting pipe 69 in the heat exchanger core 51 arranged on the second-stage intermediate support plate 62.

[0035] Then, by attaching a heat insulating material 52a to the inner surface of the high-temperature side supply header 52, the temperature rise of the high-temperature side supply header 52 itself caused by the high-temperature helium gas H1 is suppressed, and the temperature of the high-temperature side supply header 52 is suppressed, for example, to 400° C. Also, by attaching a heat insulating material 54a to the inner surface of the low-temperature side discharge header 54, the temperature rise of the low-temperature side discharge header 54 itself caused by the high-temperature helium gas H12 is suppressed, and the temperature of the low-temperature side discharge header 54 is suppressed, for example, to 400° C.

[0036] The first-stage heat exchanger core 51 is supported on a lower support plate 61 supported by the pressure vessel 41, and the second- and third-stage heat exchanger cores 51 are supported on an intermediate support plate 62 supported by the inner cylinder 60. The lower parts of the high-temperature side supply header 52 and the low-temperature side discharge header 54 are supported on the lower support plate 61 supported by the pressure vessel 41, and the intermediate and upper parts of the high-temperature side supply header 52 and the low-temperature side discharge header 54 penetrate the intermediate support plate 62 to be relatively movable in the vertical direction.

[0037] <Heat exchanger function> FIG. 4 is a schematic diagram for explaining the operation of the regenerative heat exchanger of the present embodiment.

[0038] 4, high-temperature helium gas H1 is supplied from the high-temperature side supply header 52 through the connecting pipe 67 to the high-temperature supply section 63, and flows from the high-temperature supply section 63 to each high-temperature flow path HF. Meanwhile, low-temperature helium gas H11 is supplied from the low-temperature side supply header 53 through the connecting pipe 68 to the low-temperature supply section 65, and flows from the low-temperature supply section 65 to each low-temperature flow path LF. At this time, since the high-temperature supply section 63 of the heat exchanger core 51 has a higher temperature than the low-temperature supply section 65, the amount of thermal expansion of the high-temperature supply section 63 becomes larger than that of the low-temperature supply section 65, and the high-temperature supply section 63 thermally expands vertically upward and deforms into a trapezoidal shape.

[0039] Although the high-temperature side supply header 52 is prevented from rising in temperature due to the high-temperature helium gas H1 by the thermal insulation material 52a, it thermally expands vertically upward from the lower support plate 61. On the other hand, the second and third stage intermediate support plates 62 are supported by the inner cylinder 60, which is at approximately the same temperature as the low-temperature side supply header 53, rather than by the pressure vessel 41, which is at a temperature close to room temperature, so that the amount of vertical thermal expansion of the low-temperature side supply header 53 and the inner cylinder 60 is approximately the same, and the intermediate support plate 62 is maintained horizontally without tilting.

[0040] The first stage heat exchanger core 51 supported by the lower support plate 61 is connected to the high temperature side supply header 52 by the connecting pipe 67 at the lower part of the high temperature supply section 63. That is, the position of the connecting pipe 67 relative to the lower support plate 61 is a distance L1. The second stage heat exchanger core 51 supported by the intermediate support plate 62 is connected to the high temperature side supply header 52 by the connecting pipe 67 at the intermediate part of the high temperature supply section 63. That is, the position of the connecting pipe 67 relative to the intermediate support plate 62 is a distance L2 longer than the distance L1. The third stage heat exchanger core 51 supported by the intermediate support plate 62 is connected to the high temperature side supply header 52 by the connecting pipe 67 at the upper part of the high temperature supply section 63. That is, the position of the connecting pipe 67 relative to the intermediate support plate 62 is a distance L3 longer than the distance L2.

[0041] That is, the first-stage heat exchanger core 51 is connected to the high-temperature side supply header 52 by the connecting pipe 67 at a position that is a vertical distance L1 from the lower support plate 61. In this case, the high-temperature side supply header 52 and the heat exchanger core 51 thermally expand relative to the lower support plate 61, which is the same starting point, so that the amounts of thermal expansion are approximately the same, and the inclination of the connecting pipe 67 is suppressed. And, since the first-stage heat exchanger core 51 is short in distance L1 from the lower support plate 61 and the amount of thermal expansion of the high-temperature side supply header 52 is small, the first-stage heat exchanger core 51 is connected to a lower position of the heat exchanger core 51.

[0042] The second-stage heat exchanger core 51 is connected to the high-temperature supply header 52 by the connecting pipe 67 at a position at a vertical distance L2 from the intermediate support plate 62 and at a vertical distance L12 from the lower support plate 61. In this case, the high-temperature supply header 52 thermally expands relative to the lower support plate 61, and the heat exchanger core 51 thermally expands relative to the intermediate support plate 62. The high-temperature supply header 52 and the heat exchanger core 51 thermally expand from different starting points, but the high-temperature supply header 52 and the heat exchanger core 51 have different amounts of thermal expansion per unit length. That is, the high-temperature supply header 52 is about 400°C, while the heat exchanger core 51 is about 600°C, and the heat exchanger core 51 has a larger amount of thermal expansion than the high-temperature supply header 52. As a result, although the starting points of thermal expansion of the high-temperature supply header 52 and the heat exchanger core 51 are different, the amounts of thermal expansion are almost the same, and the inclination of the connecting pipe 67 is suppressed. The second stage heat exchanger core 51 is connected to the middle position of the heat exchanger core 51 because the distance L12 from the lower support plate 61 is longer than that of the first stage heat exchanger core 51 and the amount of thermal expansion of the high temperature side supply header 52 is greater.

[0043] The third-stage heat exchanger core 51 is connected to the high-temperature supply header 52 by the connecting pipe 67 at a vertical distance L3 from the intermediate support plate 62 and at a vertical distance L13 from the lower support plate 61. In this case, the high-temperature supply header 52 thermally expands relative to the lower support plate 61, and the heat exchanger core 51 thermally expands relative to the intermediate support plate 62. The high-temperature supply header 52 and the heat exchanger core 51 thermally expand from different starting points, but the high-temperature supply header 52 and the heat exchanger core 51 have different amounts of thermal expansion per unit length. That is, the high-temperature supply header 52 is about 400°C, while the heat exchanger core 51 is about 600°C, and the heat exchanger core 51 has a larger amount of thermal expansion than the high-temperature supply header 52. As a result, although the high-temperature supply header 52 and the heat exchanger core 51 have different starting points of thermal expansion, the amounts of thermal expansion are almost the same, and the inclination of the connecting pipe 67 is suppressed. The third stage heat exchanger core 51 is connected to an upper position of the heat exchanger core 51 because the distance L13 from the lower support plate 61 is longer than that of the second stage heat exchanger core 51 and the amount of thermal expansion of the high temperature side supply header 52 is greater.

[0044] The mounting height of the connecting pipe 67 in the heat exchanger core 51 of each stage is set according to the amount of thermal expansion in the vertical direction of the high-temperature side supply header 52. In other words, the mounting height of the connecting pipe 67 in the heat exchanger core 51 is set according to the difference in the amount of thermal expansion between the heat exchanger core 51 and the high-temperature side supply header 52.

[0045] Although not explained here, the mounting height of the connecting pipes 69 in the heat exchanger cores 51 of each stage is set according to the amount of thermal expansion in the vertical direction of the low-temperature side discharge header 54. In other words, the mounting height of the connecting pipes 69 in the heat exchanger cores 51 is set according to the difference in the amount of thermal expansion between the heat exchanger cores 51 and the low-temperature side discharge header 54.

[0046] [Effects of this embodiment] The heat exchanger according to the first embodiment includes a pressure vessel 41, a lower support plate (first support plate) 61 arranged horizontally inside the pressure vessel 41, a heat exchanger core (first heat exchanger core) 51 arranged on the lower support plate 61 and having high-temperature flow paths HF and low-temperature flow paths LF arranged horizontally and alternately arranged in the vertical direction, an intermediate support plate (second support plate) 62 arranged horizontally above the lower support plate 61 inside the pressure vessel 41, and a heat exchanger core arranged on the intermediate support plate 62 and having high-temperature heat paths HF and low-temperature flow paths LF arranged horizontally and alternately arranged in the vertical direction. The heat exchanger comprises a (second heat exchanger core) 51, a high-temperature side supply header 52 arranged on one horizontal side of the heat exchanger core 51, a low-temperature side supply header 53 arranged on the other horizontal side of the heat exchanger core 51, a connecting pipe (high-temperature side connecting pipe) 67 connecting the high-temperature side supply header 52 to multiple high-temperature supply sections 63, and a connecting pipe (low-temperature side connecting pipe) 68 connecting the low-temperature side supply header 53 to multiple low-temperature supply sections 65, and the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 is set according to the amount of thermal expansion of the high-temperature side supply header 52 in the vertical direction.

[0047] According to the heat exchanger of the first embodiment, although a difference in the amount of thermal expansion in the vertical direction occurs between the high-temperature side supply header 52 and the heat exchanger core 51, by setting the connection position of the connecting pipe 67 relative to the heat exchanger core 51 in accordance with the amount of thermal expansion in the vertical direction of the high-temperature side supply header 52, the difference in the amount of thermal expansion between the high-temperature side supply header 52 and the heat exchanger core 51 can be absorbed, and the length of the connecting pipe 67 can be prevented from becoming too long, thereby preventing the device from becoming too large.

[0048] The heat exchanger according to the second embodiment is the heat exchanger according to the first embodiment, and further, the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 in the heat exchanger core 51 arranged on the intermediate support plate 62 is set above the vertical connection position between the high-temperature supply section 63 and the connecting pipe 67 in the heat exchanger core 51 arranged on the lower support plate 61. This makes it possible to effectively absorb the difference in the amount of thermal expansion between the high-temperature side supply header 52 and the heat exchanger core 51.

[0049] The heat exchanger according to the third embodiment is the heat exchanger according to the first or second embodiment, and further includes a heat insulating material (heat insulating layer) 52a provided inside the high-temperature supply header 52. This makes it possible to suppress the amount of thermal expansion of the high-temperature supply header 52 due to an increase in temperature, and to reduce the difference with the amount of thermal expansion of the heat exchanger core 51.

[0050] The heat exchanger according to the fourth aspect is the heat exchanger according to any one of the first to third aspects, and further, the outer periphery of the lower support plate 61 is supported on the inner wall surface of the pressure vessel 41, and the high-temperature side supply header 52 is a pipe arranged along the vertical direction and is connected by penetrating the lower support plate 61. This allows the high-temperature side supply header 52 to thermally expand with the lower support plate 61 as the starting point.

[0051] A heat exchanger according to a fifth aspect is the heat exchanger according to any one of the first to fourth aspects, further comprising an inner cylinder 60 disposed inside the pressure vessel 41, an outer periphery of the intermediate support plate 62 being supported by the inner wall surface of the inner cylinder 60, and the high temperature side supply header 52 penetrating the intermediate support plate 62 and relatively movable in the vertical direction. As a result, even if the high temperature side supply header 52 thermally expands starting from the lower support plate 61, the intermediate support plate 62 does not rise together with the high temperature side supply header 52, and the intermediate support plate 62 can be maintained in a horizontal state.

[0052] The heat exchanger according to the sixth aspect is the heat exchanger according to any one of the first to fifth aspects, and further, the low-temperature side supply header 53 is a pipe arranged along the vertical direction, and is connected by penetrating the lower support plate 61, and is connected by penetrating the intermediate support plate 62. As a result, the intermediate support plate 62 is supported by the low-temperature side supply header 53, and the intermediate support plate 62 can be appropriately supported.

[0053] The high temperature gas reactor system according to the seventh aspect includes a high temperature gas reactor 11 that extracts heat generated by nuclear fission to the outside by helium gas, an intermediate heat utilization device that utilizes the high temperature helium gas discharged from the high temperature gas reactor 11, and a regenerative heat exchanger 14 that exchanges heat between the high temperature helium gas discharged from the intermediate heat utilization device and the low temperature helium gas, and a heat exchanger section 42 is applied as the regenerative heat exchanger 14. This makes it possible to absorb the difference in the amount of thermal expansion between the high temperature side supply header 52 and the heat exchanger core 51 in the regenerative heat exchanger 14, and thus makes it possible to suppress an increase in the length of the connecting pipe 67 and thus suppress an increase in the size of the device.

[0054] The high temperature gas-cooled reactor system according to an eighth aspect is the high temperature gas-cooled reactor system according to the seventh aspect, and further, the intermediate heat utilization equipment is at least one of an intermediate heat exchanger 12 and a gas turbine power generation system (helium gas turbine) 13. This makes it possible to efficiently utilize the heat recovered by the intermediate heat exchanger 12 and the gas turbine power generation system 13.

[0055] In the manufacturing method of the heat exchanger core according to the ninth aspect, the vertical connection position between the high-temperature supply section 63 and the communication pipe (high-temperature side communication pipe) 67 is set according to the amount of thermal expansion in the vertical direction of the high-temperature side supply header 52. This makes it possible to absorb the difference in the amount of thermal expansion between the high-temperature side supply header 52 and the heat exchanger core 51, and suppresses the lengthening of the communication pipe 67 and the increase in the size of the device.

[0056] In the above embodiment, the heat exchange section 42 is applied to the regenerative heat exchanger 14, but may be applied to another heat exchanger. [Explanation of symbols]

[0057] 10. High Temperature Gas-Cooled Reactor System 11 High-Temperature Gas-Cooled Reactors 12 Intermediate heat exchanger (intermediate heat utilization equipment) 13 Gas turbine power generation system (intermediate heat utilization equipment) 14 Regenerative heat exchanger 21 Reactor vessel 22 Core 25 Pressure Vessels 26 Heat exchange section 32 Gas Turbine 33 Generator 41 Pressure Vessels 42 Heat exchange section (heat exchanger) 43 Cooling section 51 Heat exchanger core 52 Hot side supply header 53 Cold side supply header 54 Low temperature side discharge header 61 Lower support plate (1st support plate) 62 Intermediate support plate (second support plate) 63 High temperature supply section 64 High temperature discharge section 65 Low temperature supply section 66 Low temperature discharge section 67 Connecting pipe (high temperature side connecting pipe) 68 Connecting pipe (low temperature connecting pipe) 69 Connecting Pipe H1, H2, H11, H12 Helium gas (heat medium) HF High temperature flow path (heat transfer medium flow path) LF Low temperature flow path (heat medium flow path)

Claims

1. A container; A first support plate disposed horizontally inside the container; a first heat exchanger core disposed on the first support plate and having high-temperature heat transfer medium passages and low-temperature heat transfer medium passages arranged alternately in a vertical direction along a horizontal direction; A second support plate is disposed vertically above the first support plate and horizontally inside the container; a second heat exchanger core disposed on the second support plate and having high-temperature heat transfer medium passages and low-temperature heat transfer medium passages arranged alternately in a vertical direction along a horizontal direction; a high temperature side supply header disposed on one side in a horizontal direction with respect to the first heat exchanger core and the second heat exchanger core; a low-temperature side supply header disposed on the other side in a horizontal direction relative to the first heat exchanger core and the second heat exchanger core; a high-temperature side communication pipe connecting the high-temperature side supply header and supply portions of the plurality of high-temperature heat transfer medium flow paths; a low-temperature side connection pipe connecting the low-temperature side supply header and supply portions of the plurality of low-temperature heat transfer medium flow paths; Equipped with a connection position in a vertical direction between the supply portion of the high-temperature heat transfer medium flow path and the high-temperature side communication pipe is set according to a thermal elongation amount in the vertical direction of the high-temperature side supply header. heat exchanger.

2. a connecting position in a vertical direction between the supply portion of the high-temperature heat medium flow path and the high-temperature side communication pipe in the second heat exchanger core is set above a connecting position in a vertical direction between the supply portion of the high-temperature heat medium flow path and the high-temperature side communication pipe in the first heat exchanger core.

2. The heat exchanger of claim 1.

3. The high temperature side supply header has an insulating layer provided therein. The heat exchanger according to claim 1 or 2.

4. the first support plate has an outer periphery supported by an inner wall surface of the container, and the high-temperature side supply header is a pipe arranged along a vertical direction and is connected to the high-temperature side supply header by penetrating the first support plate; 2. The heat exchanger of claim 1.

5. an inner cylinder is disposed inside the container, an outer periphery of the second support plate is supported on an inner wall surface of the inner cylinder, and the high-temperature side supply header is movable relatively in a vertical direction through the second support plate; 5. The heat exchanger of claim 4.

6. the low-temperature side supply header is a pipe arranged along a vertical direction, and is connected to the first support plate by penetrating therethrough and is connected to the second support plate by penetrating therethrough; 6. The heat exchanger according to claim 5.

7. A high-temperature gas reactor uses helium gas to extract the heat generated by nuclear fission to the outside. an intermediate heat utilization device that utilizes the high-temperature helium gas discharged from the high-temperature gas reactor; a regenerative heat exchanger that exchanges heat between the high-temperature helium gas discharged from the intermediate heat utilization equipment and the low-temperature helium gas; Equipped with The heat exchanger according to claim 1 is applied as the regenerative heat exchanger. High temperature gas reactor system.

8. The intermediate heat utilization equipment is at least one of an intermediate heat exchanger and a helium gas turbine. The high temperature gas reactor system according to claim 7 .

9. A container; A first support plate disposed horizontally inside the container; a first heat exchanger core disposed on the first support plate and having high-temperature heat transfer medium passages and low-temperature heat transfer medium passages arranged alternately in a vertical direction along a horizontal direction; A second support plate is disposed vertically above the first support plate and horizontally inside the container; a second heat exchanger core disposed on the second support plate and having high-temperature heat transfer medium passages and low-temperature heat transfer medium passages arranged alternately in a vertical direction along a horizontal direction; a high temperature side supply header disposed on one side in a horizontal direction with respect to the first heat exchanger core and the second heat exchanger core; a low-temperature side supply header disposed on the other side in a horizontal direction relative to the first heat exchanger core and the second heat exchanger core; a high-temperature side communication pipe connecting the high-temperature side supply header and supply portions of the plurality of high-temperature heat transfer medium flow paths; a low-temperature side connection pipe connecting the low-temperature side supply header and supply portions of the plurality of low-temperature heat transfer medium flow paths; In a heat exchanger comprising: a connection position in a vertical direction between the supply portion of the high-temperature heat transfer medium flow path and the high-temperature side communication pipe is set in accordance with a thermal elongation amount in the vertical direction of the high-temperature side supply header; A method for manufacturing a heat exchanger.

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