Heat exchanger and high-temperature gas furnace system

Abstract

To make it possible to restrain upsizing of a device by efficiently supporting a lower part of a heat transfer pipe in a heat exchanger and a high-temperature gas furnace system.SOLUTION: A heat exchanger comprises: a container provided with an inlet part for a high-temperature heat medium in a lower part in a vertical direction; a center pipe arranged along the vertical direction in a center part of the container; a heat transfer pipe supporting part supported by the center pipe inside the container; a helical coil type heat transfer pipe supported by the heat transfer pipe supporting part, and inside which a low-temperature heat medium flows; and a pipe end supporting part arranged so as to extend downward from the heat transfer pipe supporting part, and supporting a lower end part of the helical coil type heat transfer pipe connected to the center pipe.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] A helical heat exchanger is configured by arranging helical coil heat transfer tubes inside a vessel. The helical coil heat transfer tubes are supported on a support plate supported on the vessel's center pipe, and their lower parts are supported by support fittings fixed to the support beams of the center pipe. The helical heat exchanger exchanges heat between a high-temperature heat medium supplied from the bottom of the vessel and a low-temperature heat medium flowing inside the heat transfer tubes. Examples of such helical heat exchangers include those described in Patent Documents 1 and 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 59-205593 [Patent Document 2] Japanese Utility Model Application Publication No. 60-176382 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional helical heat exchangers, helical coil heat transfer tubes are supported by a support plate attached to a center pipe, and their lower portions are supported by support brackets fixed to the support beams of the center pipe. In this case, the support brackets are cantilevered, with their ends fixed to the outer surface of the center pipe. Therefore, as the heat transfer tubes become larger, it can become difficult for the support brackets to support the heavy weight of the heat transfer tubes. As a countermeasure, it becomes necessary to increase the size of the support brackets or to firmly secure the support brackets to the center pipe, which results in an increase in the size of the device.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to provide a heat exchanger and a high-temperature gas reactor system that can suppress the increase in size of the device by efficiently supporting the lower part of the heat transfer tube. [Means for solving the problem]

[0006] In order to achieve the above object, the heat exchanger of the present disclosure includes a container having an inlet for a high-temperature heat medium at its lower vertical position, a center pipe arranged vertically in the center of the container, a heat transfer tube support supported by the center pipe inside the container, a helical coil heat transfer tube supported by the heat transfer tube support and through which a low-temperature heat medium flows, and a tube end support extending downward from the heat transfer tube support and connected to the center pipe to support the lower end of the helical coil heat transfer tube.

[0007] The high-temperature gas reactor system disclosed herein also includes a high-temperature gas reactor that extracts heat generated by nuclear fission to the outside using helium gas, an intermediate heat exchanger that exchanges heat between the high-temperature helium gas discharged from the high-temperature gas reactor and a heat medium, and a regenerative heat exchanger that exchanges heat between the high-temperature helium gas discharged from the intermediate heat exchanger and low-temperature helium gas. [Effects of the Invention]

[0008] According to the heat exchanger and high-temperature gas reactor system of the present disclosure, the lower part of the heat transfer tube can be efficiently supported, thereby preventing the device from becoming large in size. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing a high-temperature gas-cooled reactor system according to this embodiment. [Figure 2] FIG. 2 is a side view showing the intermediate heat exchanger of this embodiment. [Figure 3] FIG. 3 is a plan view of a main part showing a heat transfer tube support structure of the intermediate heat exchanger. [Figure 4] FIG. 4 is a schematic diagram showing a lower support structure for the heat transfer tubes of the intermediate heat exchanger. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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 configurations that combine the embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range.

[0011] <High-Temperature Gas-Cooled Reactor System> FIG. 1 is a schematic diagram showing a high-temperature gas-cooled reactor system according to this embodiment.

[0012] As shown in FIG. 1, the 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.

[0013] The high-temperature gas-cooled 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-cooled 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 reactor core 22, and is then discharged to the outside of the reactor vessel 21 from the outlet section 24.

[0014] The intermediate heat exchanger 12 is configured by accommodating a heat exchange unit 26 inside a pressure vessel 25. The pressure vessel 25 is provided with an inlet 27 and an outlet 28, and the inlet 27 is connected to the outlet 24 of the reactor vessel 21 of the high-temperature gas-cooled reactor 11 via a pipe 29. The pressure vessel 25 is also provided with a supply unit 30 that supplies a heat medium to the heat exchange unit 26 and a discharge unit 31 that discharges the heat medium from the heat exchange unit 26. Helium gas is supplied to the pressure vessel 25 from the inlet 27, and the heat medium is supplied to the heat exchange unit 26 from the supply unit 30. The heat exchange unit 26 exchanges heat between the high-temperature helium gas and the heat medium. The helium gas, whose temperature has been lowered by the heat exchange, is discharged to the outside of the pressure vessel 25 from the outlet 28. On the other hand, the heat medium, whose temperature has been increased by the heat exchange, is discharged to the outside of the pressure vessel 25 from the discharge unit 31.

[0015] 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 are rotatable together by a rotary shaft 36. The rotary shaft 36 has one axial end connected to the generator 33. In the gas turbine power generation system 13, a pipe 37 extending 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, and drives the rotary shaft 36 to rotate. The generator 33 generates electricity by obtaining driving force from the rotary shaft 36.

[0016] 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 in the upper part and the cooling section 43 arranged in the lower part. 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 then to the heat exchange section 42. The helium gas is supplied to the cooling section 43 of the heat exchange section 42, where it is cooled, and then supplied again to the heat exchange section 42. 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 due to 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 .

[0017] <Intermediate heat exchanger> FIG. 2 is a side view showing the intermediate heat exchanger of this embodiment, and FIG. 3 is a plan view of the main part showing the heat transfer tube support structure of the intermediate heat exchanger.

[0018] The intermediate heat exchanger 12 is a helical-type heat exchanger and includes a pressure vessel 25, a center pipe 51, a heat transfer tube support 52, helical coil heat transfer tubes 53 (heat exchange section 26), and tube end support sections 54.

[0019] As shown in Figures 1 and 2, pressure vessel 25 is a sealed vessel that is long in the vertical direction. Pressure vessel 25 has a body portion 61, an upper hemispherical portion 62, and a lower hemispherical portion 63. Body portion 61 is cylindrical. Body portion 61 has upper hemispherical portion 62 integrally connected to its upper portion and lower hemispherical portion 63 integrally connected to its lower portion. Pressure vessel 25 has inlet portion 27 for high-temperature helium gas (high-temperature heat medium) provided in lower hemispherical portion 63. Pressure vessel 25 also has outlet portion 28 for high-temperature helium gas (high-temperature heat medium) provided in body portion 61.

[0020] A center pipe 51 is disposed vertically in the center of the pressure vessel 25. The center pipe 51 is a cylindrical pipe disposed vertically, with its upper portion penetrating and connected to the upper hemispherical portion 62 and its lower portion closed. A plurality of hanging support plates 64 are fixed to the upper end of the center pipe 51 inside the pressure vessel 25. The plurality of hanging support plates 64 are plate-shaped and extend vertically and radially of the pressure vessel 25. The plurality of hanging support plates 64 are disposed at intervals around the circumferential direction of the center pipe 51, and one radial end is fixed to the outer peripheral surface of the center pipe 51.

[0021] The heat transfer tube support part 52 is supported by the center pipe 51 inside the pressure vessel 25. Specifically, the heat transfer tube support part 52 is supported by being suspended from a plurality of hanging support plates 64 fixed to the center pipe 51. The heat transfer tube support part 52 has a plurality of support plates 65 that are aligned along the vertical and radial directions of the pressure vessel 25. The plurality of support plates 65 are arranged at intervals in the circumferential direction of the pressure vessel 25. The number of the plurality of hanging support plates 64 and the number of the plurality of support plates 65 are the same. The plurality of support plates 65 are supported by being suspended from the plurality of hanging support plates 64. The plurality of hanging support plates 64 and the plurality of support plates 65 are arranged at the same positions in the circumferential direction of the pressure vessel 25.

[0022] The support plate 65 is provided with a large number of through holes (not shown) that penetrate through it in the thickness direction (circumferential direction of the pressure vessel 25). The support plate 65 has a lattice shape formed by the large number of through holes. The helical coil type heat transfer tubes 53 are a group of many heat transfer tubes that are arranged around the center pipe 51 to form a spiral shape. The helical coil type heat transfer tubes 53 are supported by the multiple support plates 65. In other words, the helical coil type heat transfer tubes 53 are supported by penetrating through the through holes of the multiple support plates 65.

[0023] A low-temperature heat transfer medium flows inside the helical coil heat transfer tube 53. The low-temperature heat transfer medium is, for example, low-temperature helium gas. The helical coil heat transfer tube 53 is supported by the heat transfer tube support part 52. The pressure vessel 25 has an inlet part 66 (supply part 30) for the low-temperature heat transfer medium in the upper hemispherical part 62. The center pipe 51 has an outlet part 67 (discharge part 31) for the low-temperature heat transfer medium at its upper end in the vertical direction. The upper end of the helical coil heat transfer tube 53 is connected to the inlet part 66 for the low-temperature heat transfer medium, and the lower end is connected to the lower end of the center pipe 51.

[0024] Additionally, the pressure vessel 25 has an inner cylinder 68 disposed inside the body 61. In the pressure vessel 25, the inner wall surface of the body 61 and the outer wall surface of the inner cylinder 68 form a flow path 69 along the vertical direction.

[0025] Therefore, high-temperature helium gas is supplied into pressure vessel 25 from inlet 27 and rises in the space in which helical coil heat transfer tube 53 is disposed. On the other hand, low-temperature heat transfer medium is supplied to helical coil heat transfer tube 53 from inlet 66 of pressure vessel 25 and flows downward while passing through helical coil heat transfer tube 53. At this time, heat is exchanged between the high-temperature helium gas flowing outside helical coil heat transfer tube 53 and the low-temperature heat transfer medium flowing inside helical coil heat transfer tube 53.

[0026] That is, the low-temperature heat transfer medium flowing inside helical coil heat transfer tube 53 is heated by the high-temperature helium gas flowing outside helical coil heat transfer tube 53, and its temperature increases. The heat transfer medium with the increased temperature flows from helical coil heat transfer tube 53 to center pipe 51 and rises inside center pipe 51. The high-temperature heat transfer medium then passes from center pipe 51 through outlet 67 and is discharged to the outside of pressure vessel 25. Meanwhile, the helium gas with the reduced temperature flows downward through flow path 69 on the outside of helical coil heat transfer tube 53 and is discharged to the outside of pressure vessel 25 through outlet 28.

[0027] <Tube end support part> FIG. 4 is a schematic diagram showing a lower support structure for the heat transfer tubes of the intermediate heat exchanger.

[0028] 1 to 3, the tube end support portion 54 is disposed so as to extend downward from the heat transfer tube support portion 52. The tube end support portion 54 supports the lower end portion of the helical coil type heat transfer tube 53 that is connected from the heat transfer tube support portion 52 to the center pipe 51.

[0029] The tube end support section 54 has a plurality of tube end support plates 71. The plurality of tube end support plates 71 are arranged along the circumferential direction of the pressure vessel 25. The plurality of tube end support plates 71 are arranged at intervals in the radial direction of the pressure vessel 25. The plurality of helical coil heat transfer tubes 53 extend vertically and then horizontally and are connected to the center pipe 51. The tube end support plates 71 support the lower end portions 53a of the plurality of helical coil heat transfer tubes 53, which extend horizontally along the radial direction below the plurality of helical coil heat transfer tubes 53. The helical coil heat transfer tubes 53 are supported with their lower end portions 53a penetrating the tube end support plates 71 in the radial direction of the pressure vessel 25.

[0030] The heat transfer tube support section 52 is composed of a plurality of support plates 65 arranged at intervals around the circumferential direction of the pressure vessel 25. The helical coil type heat transfer tubes 53 are supported around the center pipe 51 by passing through the plurality of support plates 53. The heat transfer tube support section 52 has a heat radiation plate 72 arranged between the plurality of support plates 65. The heat radiation plate 72 has a curved shape that follows the direction of exit of the pressure vessel 25. The heat radiation plate 72 is arranged to connect the plurality of support plates 65 in the circumferential direction. The heat radiation plates 72 are arranged at intervals in the radial direction of the pressure vessel 25. In other words, they are arranged between adjacent helical coil type heat transfer tubes 53 in the radial direction of the pressure vessel 25. The heat radiation plate 72 is made of a material (e.g., Hastelloy) that has a higher thermal emissivity (thermal reflectivity) than the support plate 65.

[0031] The multiple tube end support plates 71 constituting the tube end support portion 54 are configured by multiple heat radiation plates 72 extending downward. That is, the tube end support portion 54 is provided integrally with the heat radiation plates 72. The tube end support portion 54 provided integrally with the heat radiation plates 72 is supported by the tube end support portion 54 when a through hole (not shown) is formed in the pressure vessel 25 along the radial direction and the lower end portion 53 a of the helical coil type heat transfer tube 53 is inserted into the through hole of the tube end support plate 71.

[0032] However, the multiple tube end support plates 71 that make up the tube end support section 54 are not limited to the configuration described above. The tube end support section 54 may be provided separately from the heat radiation plate 72. That is, the tube end support section 54 may be formed as a separate member from the heat radiation plate 72, and the tube end support section 54 may be connected to or suspended from the heat radiation plate 72.

[0033] In this embodiment, the tube end support portion 54 (tube end support plate 71) that supports the lower end portion 53a of the helical coil type heat transfer tube 53 is provided so as to extend downward from the heat transfer tube support portion 52. Therefore, the tube end support plate 71 is not cantilevered, and sufficient strength can be ensured even if the helical coil type heat transfer tube 53 is increased in weight. Furthermore, because the tube end support portion 54 can ensure sufficient strength, the device does not become large in size.

[0034] [Effects of this embodiment] The heat exchanger according to the first embodiment comprises a pressure vessel 25 having an inlet 27 for helium gas (high-temperature heat transfer medium) at the bottom in the vertical direction, a center pipe 51 arranged vertically in the center of the pressure vessel 25, a heat transfer tube support 52 supported by the center pipe 51 inside the pressure vessel 25, a helical coil type heat transfer tube 53 supported by the heat transfer tube support 52 and through which a low-temperature heat transfer medium flows, and a tube end support 54 extending downward from the heat transfer tube support 52 and supporting a lower end 53 a of the helical coil type heat transfer tube 53 connected to the center pipe 51.

[0035] In the heat exchanger according to the first aspect, tube end supports 54 are disposed extending downward from heat transfer tube supports 52, and support lower ends 53a of helical coil heat transfer tubes 53 connected to center pipe 51. Therefore, tube end supports 54 no longer have a cantilevered support structure, and the support rigidity is increased, allowing for appropriate support of helical coil heat transfer tubes 53. As a result, efficient support of lower ends 53a of helical coil heat transfer tubes 53 can prevent the device from becoming too large.

[0036] The heat exchanger according to the second aspect is the heat exchanger according to the first aspect, and furthermore, the tube end support portion 54 has a tube end support plate 71 arranged along the circumferential direction of the pressure vessel 25, and the helical coil type heat transfer tube 53 is supported by having its lower end portion 53a penetrate the tube end support plate 71 in the radial direction of the pressure vessel 25. This simplifies the configuration of the tube end support portion 54.

[0037] The heat exchanger according to the third aspect is the heat exchanger according to the second aspect, and further includes a plurality of tube end support plates 71 arranged at intervals in the radial direction of the pressure vessel 25. This allows the plurality of tube end support plates 71 to appropriately support the lower ends 53a of the plurality of helical coil type heat exchangers.

[0038] A heat exchanger according to a fourth aspect is the heat exchanger according to any one of the first to third aspects, and further comprises: the heat transfer tube support part 52 is configured by a plurality of support plates 65 arranged along the radial direction of the pressure vessel 25 at intervals in the circumferential direction of the pressure vessel 25; heat radiation plates 72 are arranged between the plurality of support plates 65 along the circumferential direction of the pressure vessel 25; and the tube end support part 54 is configured by the heat radiation plates 72 extending downward. This allows the tube end support plates 71 to be manufactured integrally with the heat radiation plates 72, improving manufacturability and reducing manufacturing costs.

[0039] A heat exchanger according to a fifth aspect is the heat exchanger according to any one of the first to third aspects, and furthermore, the heat transfer tube support part 52 is configured by a plurality of support plates 65 arranged along the radial direction of the pressure vessel 25 at intervals in the circumferential direction of the pressure vessel 25, and heat radiation plates 72 arranged along the circumferential direction of the pressure vessel 25 are respectively arranged between the plurality of support plates 65, and the tube end support part 54 is supported by being suspended from the heat radiation plates 72. In this way, by manufacturing the tube end support plates 71 separately from the heat radiation plates 72, it is possible to reduce the size of the components and improve assembly ease.

[0040] The high-temperature gas-cooled reactor system according to the sixth aspect includes a high-temperature gas-cooled reactor 11 that extracts heat generated by nuclear fission to the outside using helium gas, an intermediate heat exchanger 12 that exchanges heat between the high-temperature helium gas discharged from the high-temperature gas-cooled reactor 11 and a heat medium, and a regenerative heat exchanger 14 that exchanges heat between the high-temperature helium gas discharged from the intermediate heat exchanger 12 and low-temperature helium gas. As a result, in the intermediate heat exchanger 12, the tube end support parts 54 efficiently support the lower ends 53a of the helical coil type heat transfer tubes 53, thereby preventing the device from becoming larger.

[0041] In the above-described embodiment, the heat exchange unit is applied to the intermediate heat exchanger 12, but may be applied to another heat exchanger. [Explanation of symbols]

[0042] 10. High-Temperature Gas-Cooled Reactor System 11. High-Temperature Gas-Cooled Reactor 12 Intermediate heat exchanger 13 Gas turbine power generation system 14 Regenerative heat exchanger 21 Reactor vessel 22 Reactor Core 25 Pressure Vessels 26 Heat exchange section 27 Entrance 28 Exit section 32 Gas turbine 33 Generator 41 Pressure vessels 42 Heat exchange section 43 Cooling section 51 Center pipe 52 Heat transfer tube support 53 Helical coil type heat transfer tube (heat exchange section 26) 53a Lower end 54 Pipe end support part 61 Torso 62 Upper hemisphere 63 Lower hemisphere 64 Hanging support plate 65 Support plate 66 Entrance 67 Exit section 68 Inner cylinder 69 Flow path 71 Tube end support plate 72 Heat radiation plate

Claims

1. A vessel having an inlet for a high-temperature heat transfer medium provided at a vertically lower portion thereof; a center pipe disposed vertically in the center of the container; a heat transfer tube support portion supported by the center pipe inside the container; a helical coil type heat transfer tube supported by the heat transfer tube support portion and having a low-temperature heat medium flowing therethrough; a tube end support portion extending downward from the heat transfer tube support portion and supporting a lower end portion of the helical coil type heat transfer tube connected to the center pipe; A heat exchanger comprising:

2. The tube end support portion has a tube end support plate arranged along the circumferential direction of the container, and the lower end of the helical coil type heat transfer tube is supported by penetrating the tube end support plate in the radial direction of the container.

2. The heat exchanger of claim 1.

3. The tube end support plate is arranged at intervals in the radial direction of the vessel.

3. The heat exchanger of claim 2.

4. The heat transfer tube support portion is configured by a plurality of support plates arranged at intervals in the circumferential direction of the container along the radial direction of the container, and heat radiation plates are arranged between the plurality of support plates along the circumferential direction of the container, and the tube end support portion is configured by the heat radiation plates extending downward.

2. The heat exchanger of claim 1.

5. The heat transfer tube support portion is configured by a plurality of support plates arranged at intervals in the circumferential direction of the container along the radial direction of the container, and heat radiation plates along the circumferential direction of the container are respectively arranged between the plurality of support plates, and the tube end support portion is supported by being suspended from the heat radiation plates.

2. The heat exchanger of claim 1.

6. A high-temperature gas reactor uses helium gas to extract the heat generated by nuclear fission to the outside. an intermediate heat exchanger for exchanging heat between the high-temperature helium gas discharged from the high-temperature gas reactor and a heat medium; a regenerative heat exchanger for exchanging heat between the high-temperature helium gas discharged from the intermediate heat exchanger and the low-temperature helium gas; Equipped with The heat exchanger according to claim 1 is applied as the intermediate heat exchanger. High temperature gas reactor system.

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