CN109616227B - Dispersion filling composite function metal heat preservation - Google Patents
Dispersion filling composite function metal heat preservation Download PDFInfo
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- CN109616227B CN109616227B CN201811475508.1A CN201811475508A CN109616227B CN 109616227 B CN109616227 B CN 109616227B CN 201811475508 A CN201811475508 A CN 201811475508A CN 109616227 B CN109616227 B CN 109616227B
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 84
- 239000002184 metal Substances 0.000 title claims abstract description 84
- 238000004321 preservation Methods 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 239000006185 dispersion Substances 0.000 title claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 16
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 13
- 238000009413 insulation Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 14
- 229910001080 W alloy Inorganic materials 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 11
- 235000019219 chocolate Nutrition 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 57
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- 229920002050 silicone resin Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/08—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation
- G21C11/083—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation consisting of one or more metallic layers
- G21C11/085—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation consisting of one or more metallic layers consisting exclusively of several metallic layers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/02—Biological shielding ; Neutron or gamma shielding
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/02—Biological shielding ; Neutron or gamma shielding
- G21C11/028—Biological shielding ; Neutron or gamma shielding characterised by the form or by the material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Plasma & Fusion (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Thermal Insulation (AREA)
Abstract
The invention discloses a dispersion filling composite functional metal heat-insulating layer, which comprises a heat-insulating outer box, and a gamma shielding layer, boron carbide powder and a metal reflecting foil which are filled in the heat-insulating outer box, wherein the gamma shielding layer is made of an inorganic shielding material with metal characteristics; the filling sequence on the thickness section of the heat preservation layer is as follows: the inner shell plate, the inner side gamma shielding layer, the metal reflecting foil, the outer side gamma shielding layer and the outer shell plate of the heat-preservation outer box are uniformly dispersed in a cavity between two adjacent layers of metal foils; the metal reflecting foils are in a positive and negative double-ball socket corrugated shape or a periodically-changing positive and negative triangular corrugated shape or a chocolate corrugated shape which are arranged at intervals in a longitudinal and transverse regular mode, and the adjacent two layers of metal reflecting foils are stacked in a back-to-back staggered mode in a mode that the vertexes of the positive and negative ball sockets are opposite to the vertexes. The composite metal heat-insulating layer provided by the invention has the functions of heat insulation and shielding radiation, and can be used in a high-temperature radiation environment for a long time without replacement.
Description
Technical Field
The invention relates to the technical field of nuclear industry, in particular to a dispersion filling composite functional metal heat-insulating layer.
Background
When a nuclear reactor normally operates, high-temperature, high-pressure and high-radioactivity cooling media flow in primary nuclear equipment and a pipeline, heat insulation layers are required to be arranged on the outer surfaces of the primary nuclear equipment and the pipeline for heat insulation, so that heat loss is reduced, meanwhile, shielding materials are required to be arranged outside the primary nuclear equipment and the pipeline for reducing radiation dose of the periphery of the equipment, and the nuclear reactor is beneficial to inspection and maintenance of personnel in service. At present, the metal heat-insulating layer is usually adopted outside primary equipment and a pipeline of a nuclear reactor coolant system, but the metal heat-insulating layer only has the heat-insulating function and does not have the shielding function, for example: the metal heat-insulating layers provided by the patents US3904379A, CN1159062A and CN203131332U do not have the shielding function. However, with the development of nuclear power technology, the demand for nuclear-grade equipment and pipeline insulating layers with heat preservation and insulation functions and shielding functions is more obvious, patents CN103174912B and CN103971761A each provide a composite insulating layer with shielding function, but both shielding materials use non-metallic organic materials such as boron-containing silicone resin, boron-containing polyethylene plate, boron-containing epoxy resin plate, and the like, the applicable temperature range of the non-metallic organic shielding materials is generally not higher than 200 ℃, even under the working environment lower than 200 ℃, due to the inherent characteristic limitation of the organic resin materials, the non-metallic organic shielding materials inevitably generate performance aging under high-temperature and long-time use, so that the shielding function of the non-metallic organic shielding materials is gradually reduced and even lost, the service life of the non-metallic organic shielding materials is not very long, when the non-metallic organic shielding materials are used in nuclear power plants and nuclear power equipment with long service lives (such as 60 years), it must be replaced regularly to ensure that its shielding performance is always satisfactory.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the composite metal heat-insulating layer with the radiation shielding function in the prior art is made of organic materials, has poor high-temperature resistance and short service life, and needs to be replaced periodically.
The invention is realized by the following technical scheme:
a dispersion-filled composite functional metal heat-insulating layer comprises a heat-insulating outer box, and an inner gamma shielding layer, an outer gamma shielding layer, boron carbide powder and a metal reflecting foil which are filled in the heat-insulating outer box, wherein the inner gamma shielding layer and the outer gamma shielding layer are both made of inorganic shielding materials with metal characteristics; the filling sequence on the thickness section of the heat preservation layer is as follows in sequence: the inner shell plate, the inner side gamma shielding layer, the plurality of layers of metal reflecting foils, the outer side gamma shielding layer and the outer shell plate of the heat-insulating outer box are arranged on the heat-insulating outer box, and the boron carbide powder is uniformly dispersed in a cavity between two adjacent layers of metal foils; the metal reflecting foils are integrally arranged in a corrugated shape at intervals in a longitudinal and transverse regular mode through the forward ball sockets and the reverse ball sockets, and the adjacent two layers of metal reflecting foils are stacked in a back-to-back staggered mode from the vertexes of the forward ball sockets to the vertexes of the reverse ball sockets.
The heat-insulating outer box of the metal heat-insulating layer provided by the invention can be formed by making the inner shell plate face the outer wall of the heating equipment or making the outer shell plate face the outer wall of the heating equipment, and the overall appearance of the metal heat-insulating layer can be made into a flat plate shape, a round tube shape or a spherical surface shape according to the shape of the surface of the equipment. The filling layer number of the metal reflecting foils is determined according to the heat preservation and radiation shielding requirements of heating equipment, and the distance between two adjacent layers of the metal reflecting foils can be adjusted by controlling the heights of the forward ball socket and the reverse ball socket so as to optimize the filling layer number of the metal reflecting foils and the heat preservation and insulation effects. When two adjacent layers of metal reflecting foils are filled, the positive and negative ball sockets are required to be oppositely arranged in a back staggered manner, so that the contact between the two adjacent layers of metal reflecting foils is all point contact, the metal contact area is reduced, and the metal contact heat conduction loss is reduced.
Furthermore, the heat-preservation outer box is a closed outer box formed by welding an inner shell plate, an outer shell plate and peripheral side shell plates, wherein the inner shell plate, the outer shell plate and the peripheral side shell plates are all made of double-mirror-surface austenitic stainless steel thin plates.
Further, the austenitic stainless steel sheet has a Co content of 1% by mass or less to minimize the level of an activator dose after being subjected to neutron and gamma irradiation.
Further, the inner gamma shielding layer and the outer gamma shielding layer are both made of lead plates or tungsten alloy plates.
Furthermore, the metal reflecting foil is made into a corrugated shape of positive ball sockets and negative ball sockets which are arranged at regular intervals in a longitudinal and transverse mode by adopting an ultrathin austenitic stainless steel foil belt.
Further, the ultrathin austenitic stainless steel foil strip is prepared through solution annealing and double-sided brightness treatment, and the mass percentage of Co is less than or equal to 1%.
The ultra-thin austenitic stainless steel foil strip used for pressing the metal reflective foil should be solution annealed, double-side brightly treated, and Co content controlled at a level not greater than 1%, for the purpose of: 1) the plasticity and toughness of the stainless steel foil strip are enhanced to prevent the stainless steel foil strip from being torn during press forming; 2) the surface smoothness of the stainless steel foil strip is improved to reduce the surface emissivity of the foil strip and enhance the radiation reflection capability of the metal reflection foil to heat; 3) the activation dose level after neutron and gamma irradiation is minimized.
The invention has the following advantages and beneficial effects:
1. the composite metal heat-insulating layer is characterized in that neutron and gamma shielding materials are added in the metal heat-insulating layer structure, so that the excellent heat-insulating function of the metal heat-insulating layer is kept, the radiation shielding function of shielding neutrons and gamma rays is newly added, the neutron shielding layer adopts boron carbide powder, the gamma shielding layers on the inner side and the outer side adopt lead plates or tungsten alloy plates, the three shielding materials are all inorganic shielding materials with metal characteristics, are high-temperature resistant, radiation resistant, stable in chemical and physical properties, can be used in a high-temperature and high-radiation environment for a long life without aging and shielding performance reduction, do not need to be replaced regularly, and well overcome the defects that the non-metal organic shielding materials used in patents CN103174912B and CN103971761A are not high-temperature resistant, easy to age and need to be replaced regularly;
2. the corrugated structure of the single-layer metal reflecting foil and the stacking structure of the multiple layers of metal reflecting foils filled in the composite metal heat-insulating layer can effectively reduce the radiation heat transfer quantity and the metal contact heat conduction heat transfer quantity, and improve the heat-insulating effect of the composite metal heat-insulating layer. In addition, the positive and negative double-ball socket corrugated structures on the metal reflecting foil are regularly arranged on the whole plane at intervals in the longitudinal and transverse directions, are uniformly distributed in all directions, can be extremely conveniently rolled into a circular tube shape or a spherical shape without distinguishing the corrugated directions, and can conveniently make the whole appearance of the whole composite metal heat-insulating layer into a circular tube shape or a spherical shape according to the surface shape of equipment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of a composite metal insulation layer according to the present invention;
FIG. 2 is a plan top view of the metal reflective foil of FIG. 1;
fig. 3 is a cross-sectional structure a-a of the metal reflective foil of fig. 2.
Reference numbers and corresponding part names in the drawings: 1-inner shell plate, 2-outer shell plate, 3-side shell plate, 4-inner gamma shielding layer, 5-boron carbide powder, 6-outer gamma shielding layer, 7-metal reflecting foil, 8-forward ball socket and 9-reverse ball socket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in figure 1, the composite metal heat-insulating layer of the invention is composed of a heat-insulating outer box, an inner gamma shielding layer 4, an outer gamma shielding layer 6, boron carbide powder 5 and a metal reflecting foil 7 which are filled in the heat-insulating outer box, wherein the filling sequence of the parts on the thickness section is as follows: the inner shell plate 1 of the heat-preservation outer box, the inner side gamma shielding layer 4, the multiple layers of metal reflecting foils 7, the boron carbide powder 5, the outer side gamma shielding layer 6 and the outer shell plate 2 of the heat-preservation outer box, wherein the boron carbide powder 5 is uniformly dispersed in a cavity between the two adjacent layers of metal reflecting foils 7. The overall appearance of the composite metal heat-insulating layer with the shielding function can be manufactured into a flat plate shape, a round tube shape or a spherical surface shape according to the shape of the surface of equipment, the used high-temperature range can generally reach 450 ℃, the heat-insulating property can generally achieve that the equivalent heat conductivity coefficient is less than 0.075W/(m.K), and the service life can be expected to be 60 years or even longer.
The heat preservation outer box is a closed outer box formed by welding an inner shell plate 1, an outer shell plate 2 and peripheral side shell plates 3 in a spot welding or intermittent welding mode, the material is made of an austenitic stainless steel thin plate, double-side polishing needs to be carried out on the austenitic stainless steel thin plate to meet the requirement of double mirror surfaces, and the content of Co in the austenitic stainless steel thin plate is controlled to be not more than 1% so as to reduce the level of an activating agent after being subjected to neutron and gamma irradiation as much as possible. The thickness of the inner shell plate 1 and the outer shell plate 2 is generally between 0.6mm and 1.0mm, while the thickness of the side shell plate 3 may be equal to the thickness of the inner shell plate 1 or the thickness of the outer shell plate 2, but considering that the structural strength of the heat preservation box may also be slightly thicker than the thickness of the inner shell plate 1 and the thickness of the outer shell plate 2, but generally not more than 2mm, in order to further enhance the strength of the heat preservation box, the side shell plate may be pressed inward along the thickness direction of the heat preservation box with the thickness of the side shell plate 3 being kept unchanged to form equally spaced triangular grooves or semi-cylindrical grooves, so as to increase the bending section modulus of the side shell plate, thereby improving the overall structural rigidity and strength of the heat preservation box.
The boron carbide powder 5 adopts nuclear pure-grade boron carbide powder, and cavities formed among the metal reflecting foils 7 are uniformly filled in a dispersing way, so that the effect of shielding neutrons is achieved. The relative density of the boron carbide powder after filling is generally controlled to be around 50%.
The inner gamma shielding layer 4 and the outer gamma shielding layer 6 are made of lead plates or tungsten alloy plates, the lead plates are adopted when the working temperature is lower than 327 ℃ and the tungsten alloy plates are adopted when the working temperature is higher than 327 ℃, and the thicknesses of the inner gamma shielding layer 4 and the outer gamma shielding layer 6 are determined according to the radiation shielding requirement.
The metal reflecting foil 7 is made of an ultrathin austenitic stainless steel foil strip, the thickness of the metal reflecting foil is generally 0.05 mm-1.0 mm, the metal reflecting foil is pressed into a positive and negative double ball socket corrugated shape which is shown in figures 2 and 3 and is arranged at regular intervals in a longitudinal and transverse mode, two positive ball sockets are used as a circulating unit, two reverse ball sockets are used as a circulating unit, and the metal reflecting foil is distributed at equal intervals in a circulating mode. The depth of the forward ball socket and the reverse ball socket is generally within the range of 5 mm-15 mm, preferably 5-10 mm; the spacing between the adjacent positive ball sockets, the adjacent reverse ball sockets and the adjacent positive ball sockets and reverse ball sockets is generally in the range of 30 mm-90 mm. The filling layer number of the metal reflecting foils 7 is determined according to the heat preservation requirement of the heating equipment, and the distance between two adjacent layers of the metal reflecting foils 7 can be adjusted by controlling the height of the positive and negative ball sockets, so that the optimization of the filling layer number and the heat preservation and insulation effect of the metal reflecting foils 7 is achieved. When two adjacent layers of metal reflecting foils 7 are filled, the vertex of the forward ball socket 8 needs to be oppositely staggered and stacked to the vertex of the reverse ball socket 9, so that all the contacts between the two adjacent layers of metal reflecting foils 7 are point contacts, the metal contact area is reduced, and the metal contact heat conduction loss is reduced. The ultra-thin austenitic stainless steel foil strip used for pressing the metal reflecting foil 7 is subjected to solution annealing and double-side brightening treatment, and the Co content is controlled to a level of not more than 1%, for the purpose of: 1) the plasticity and toughness of the stainless steel foil strip are enhanced to prevent the stainless steel foil strip from being torn during press forming; 2) the surface smoothness of the stainless steel foil strip is improved to reduce the surface emissivity of the foil strip, and the radiation reflection capability of the metal reflection foil 7 to heat is enhanced; 3) the activation dose level after neutron and gamma irradiation is minimized.
In addition, the metal reflecting foil can also be pressed into the existing periodically-changed positive and negative triangular wave shape or chocolate wave shape, the depth and the corresponding distance parameter are set according to the content, and the pressed and formed metal reflecting foil can also achieve better heat preservation effect when being matched with the heat preservation outer box, the neutron shielding layer, the gamma shielding layer, the partition plate and other structures.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A dispersion filling composite function metal heat preservation layer is characterized by comprising a heat preservation outer box, an inner gamma shielding layer (4), an outer gamma shielding layer (6), boron carbide powder (5) and a metal reflecting foil (7), wherein the inner gamma shielding layer (4) and the outer gamma shielding layer (6) are filled in the heat preservation outer box, and are both made of inorganic shielding materials with metal characteristics; the filling sequence on the thickness section of the heat preservation layer is as follows in sequence: the inner shell plate (1) of the heat-preservation outer box, the inner gamma shielding layer (4), a plurality of layers of metal reflecting foils (7), the outer gamma shielding layer (6) and the outer shell plate (2) of the heat-preservation outer box, wherein the boron carbide powder (5) is uniformly dispersed in a cavity between two adjacent layers of metal foils (7);
each layer of metal reflecting foil (7) has the same structure, positive and negative ball sockets are arranged on each layer of metal reflecting foil (7) at intervals in a longitudinal and transverse regular mode to form a corrugated shape, and the two positive ball sockets are taken as a circulating unit, the two negative ball sockets are taken as a circulating unit, and the positive and negative ball sockets are circularly distributed at equal intervals; the diameters of the positive ball socket and the negative ball socket are equal; two adjacent layers of metal reflecting foils (7) are alternately stacked in a back-to-back mode from the vertex of the forward ball socket (8) to the vertex of the reverse ball socket (9);
the depths of the positive ball socket (8) and the reverse ball socket (9) are both 5 mm-15 mm; the distances between the adjacent positive ball sockets (8), the adjacent reverse ball sockets (9) and the adjacent positive ball sockets (8) and reverse ball sockets (9) are all in the range of 30 mm-90 mm.
2. The dispersion-filled composite functional metal insulation layer according to claim 1, wherein the insulation outer box is a closed outer box formed by welding an inner shell plate (1), an outer shell plate (2) and peripheral side shell plates (3), and the inner shell plate (1), the outer shell plate (2) and the peripheral side shell plates (3) are all made of double-mirror austenitic stainless steel sheets.
3. The dispersion-filled composite functional metal insulation layer according to claim 2, wherein the austenitic stainless steel sheet has a Co content of 1% by mass or less.
4. The dispersion-filled composite functional metal insulation layer according to claim 1, wherein the inner gamma shielding layer (4) and the outer gamma shielding layer (6) are made of lead plates or tungsten alloy plates.
5. The dispersion-filled composite functional metal insulation layer according to claim 1, wherein the metal reflective foil (7) is made of ultra-thin austenitic stainless steel foil with pressure into a corrugated shape with regular intervals of positive ball sockets (8) and negative ball sockets (9).
6. The dispersion-filled composite functional metal insulation layer according to claim 5, wherein the ultra-thin austenitic stainless steel foil strip is prepared by solution annealing and double-sided bright treatment, and the mass percentage of Co is less than or equal to 1%.
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| CN112918032A (en) * | 2021-02-09 | 2021-06-08 | 上海核工程研究设计院有限公司 | Heat insulation part for nuclear energy device |
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| 乏燃料贮运用铝基碳化硼复合材料的屏蔽性能计算;戴龙泽 等;《物理学报》;20131231;1-6页 * |
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