Molten salt reactor cabin
By introducing heat pipes and heat-conducting structures into the molten salt stack chamber, the problem of poor thermal conductivity of high-temperature pipes was solved, achieving efficient heat dissipation and a compact structure, thus improving the thermal efficiency and reliability of the molten salt stack chamber.
Patent Information
- Application Number
- CN202520049679.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
The carbon steel used in the high-temperature pipelines of existing molten salt stack chambers has poor thermal conductivity, resulting in a bulky structure, limited heat transfer, and a tendency to create local hot spots. It is also difficult to improve thermal efficiency and reliability.
The internal structure design of the molten salt stack chamber is optimized by using heat pipes. The heating elements, insulation materials and heat pipes in the heat-conducting structure are used to conduct heat efficiently through inclined channels and heat pipes, thereby reducing the hot spot temperature and thinning the thickness of the heat-conducting pipes.
It effectively reduced the hot spot temperature in the molten salt stack compartment, improved heat dissipation efficiency and reliability, simplified the structural assembly difficulty, and realized the compact modular design of the stack compartment.
Smart Images
Figure CN223828239U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a molten salt reactor vessel. BACKGROUND
[0002] In the high-temperature molten salt reactor, the operating temperature of the high-temperature pipelines in the molten salt reactor vessel and penetrating the wall structure of the reactor vessel is much higher than the allowable temperature of the concrete and some structural components of the reactor vessel. For the key structures and key equipment in the vicinity, such as the reactor vessel penetrations and structural supports, passive heat insulation and non-active heat transfer are used to achieve heat insulation and heat conduction of the key components inside the reactor vessel, avoid local hot spots, and improve the safety of the reactor.
[0003] In recent years, heat pipe technology has been increasingly popular in engineering applications due to its high heat transfer efficiency, good isothermality, rapid startup, and non-active advantages, and has been applied in many fields.
[0004] The overall structural layout of a molten salt reactor lower reactor vessel is shown in Figure 1 The molten salt reactor 11 (reactor body) and the heat exchange device of the non-active residual heat removal system fixed by the suspender 10 are located in the lower reactor vessel. The wall structure of the lower reactor vessel is sequentially composed of a reactor vessel insulation layer 12, a safety vessel 13, a serpentine stone concrete layer 14, and a common concrete layer 15 from inside to outside. The thickness of the serpentine stone concrete layer 14 is 60 cm, and the thickness of the common concrete layer 15 is 110 cm. The cooling salt loop cold pipe, the hot pipe connected to the reactor body, and the fuel salt loading and discharging pipe are all high-temperature molten salt pipelines, and the air outlet pipe connected to the heat exchange device of the non-active residual heat removal system is a high-temperature air pipeline. These pipelines all penetrate the wall structure of the lower reactor vessel and extend outside the lower reactor vessel, and their operating temperatures are all higher than 500℃.
[0005] For the heat insulation and heat conduction structure of the high-temperature pipelines inside the wall of the lower reactor vessel of the molten salt reactor, the existing scheme uses a carbon steel layer structure for heat conduction. Since the carbon steel has poor heat conduction performance, the thickness is as high as 10 cm, and for a DN40 pipeline with a length of 1.1 m, the weight of the carbon steel pipe is as high as 1.3 t, the structure is heavy and difficult to process and assemble. It will increase the weight and volume of the molten salt reactor vessel, and it is difficult to effectively improve the thermal efficiency and reliability. UTILITY MODEL CONTENTS
[0006] In order to overcome the defects of the structure of the molten salt reactor vessel in the prior art being heavy and the heat transfer being limited, and local hot spots being easily caused, the utility model provides a molten salt reactor vessel. The overall structure design of the inside of the molten salt reactor vessel is optimized by using heat pipes, so that the heat in the molten salt reactor can be efficiently led out, thereby effectively reducing the hot spot temperature in the molten salt reactor vessel and reducing the temperature of the side wall surface of the vessel; meanwhile, the thickness of the heat conduction pipeline arranged in the molten salt reactor vessel can also be reduced, the structural volume is reduced, the construction difficulty is reduced, the overall structure of the vessel is more compact, the heat dissipation efficiency is improved, the structural load is reduced, and the heat efficiency and reliability of the molten salt reactor vessel are effectively improved while the thermal safety of the vessel material is ensured.
[0007] In order to achieve the above object, the utility model provides the following technical scheme:
[0008] The utility model provides a kind of molten salt reactor vessel, it includes inside hollow cabin, first pipeline and be arranged in the inside of the cabin molten salt reactor, one end of the first pipeline is communicated with the molten salt reactor, another end is located in the side wall surface of the cabin, for the heat in the molten salt reactor is led out, heat conduction structure is also arranged in the side wall surface of the cabin, and the heat conduction structure is arranged in the periphery of one end of the first pipeline located in the side wall surface of the cabin;The heat conduction structure includes heating element, heat preservation material, second pipeline and several heat pipes;The first pipeline part is arranged in the second pipeline, and the heating element is arranged on the outer surface of the first pipeline, and the heat preservation material is filled in the gap between the second pipeline and the first pipeline;Several passages are arranged on the side end face of the second pipeline close to the outside of the cabin, and each passage extends to the other side end face of the second pipeline;Each heat pipe is located outside the molten salt reactor vessel, and is arranged on the side end face of the second pipeline, and is communicated with each passage respectively, to form the space filled with heat conduction working medium;Each passage, each heat pipe is parallel with the central axis of the second pipeline, and the second pipeline is arranged obliquely upwards, and the included angle with horizontal plane is 1 °-15 °.
[0009] In the utility model, heat conduction working medium in each passage is heated, and heat conduction working medium is changed from liquid phase to gas phase, and the passage can be called evaporation section;Each heat pipe is arranged outside the molten salt reactor vessel, and heat conduction working medium in the heat pipe is cooled, and heat conduction working medium is changed from gas phase to liquid phase, and the heat pipe can be called condensation section.
[0010] In the utility model, high-temperature molten salt in the first pipeline can not be solidified by arranging heating element, so that local hot spot can not be generated;However, using heating element can make the concrete of the vessel exceed the use limit value.
[0011] In the utility model, through inclining the heat conduction structure upward by a certain angle, make "evaporation section is below, condensation section is above", it is favorable to the heat transfer process of heat conduction working medium, optimize the operation effect of heat conduction working medium.
[0012] In the utility model, the length ratio of the channel and the heat pipe is adjustable, or the length ratio of the evaporation section and the condensation section is adjustable.
[0013] In the utility model, the first pipeline is used to carry high-temperature molten salt led out from the molten salt reactor.
[0014] In the utility model, the included angle between the heat conduction structure and the horizontal plane is designed to facilitate the flow of molten salt inside it.
[0015] In some embodiments, the included angle between the heat conduction structure and the horizontal plane is 3°-10°.
[0016] In a specific embodiment, the included angle between the heat conduction structure and the horizontal plane is 3°-5°.
[0017] In the utility model, by setting the channel and the heat pipe, the heat conduction effect of the second pipeline is improved, which is conducive to heat dissipation.
[0018] In a specific embodiment, each channel is independently set or interconnected; when each channel is independently set, the heat pipe can be independently filled and maintained when it fails, avoiding large-area or overall failure.
[0019] In some embodiments, the inner wall of the channel needs to be passivated.
[0020] In some embodiments, the heat pipe is one of a tubular structure, a plate structure, a tube-fin structure, and a plate-fin structure; preferably, the heat pipe is a tube-fin structure; with this structure, the length of the heat pipe can be shortened to expand the heat dissipation area while ensuring the smoothness of the working medium evaporation pipeline.
[0021] In some embodiments, the inside of each channel and the heat pipe connected thereto is in a vacuum state; the working medium in the heat pipe can be water, toluene, methanol, ethanol, acetone, or hexane; the optimal liquid volume of the working medium is 1 / 5-1 / 3 of the volume of the space formed by the channel and the heat pipe.
[0022] In some embodiments, the inside of the heat pipe is in a vacuum state, and the pressure of the vacuum state is 10 -3 Pa.
[0023] In some embodiments, the second pipe has a running temperature in the range of 50-200 DEG C, the heat pipes are made of copper, and the working medium in each heat pipe and each channel is water, which is low in cost.
[0024] In some embodiments, the second pipe has a running temperature in the range of 30-130 DEG C, the heat pipes are made of copper, and the working medium in each heat pipe and each channel is methanol, which is lower in starting temperature than water and easier to start; when methanol is used as the working medium, the service life of the carbon steel pipe is prolonged.
[0025] In the utility model, the length of the heat conduction structure can be less than or equal to 1 m.
[0026] In some embodiments, each heat pipe is integrated with the second pipe, and the vacuum channel can be formed by machining, so that the working medium can be filled and the vacuum environment can be realized; the thermal resistance of the heat pipe and the channel can be reduced through the integrated structure, so that the thickness of the second pipe can be further reduced, the structure can be simplified, and the heat dissipation effect can be ensured.
[0027] In specific embodiments, the second pipe is made of carbon steel or copper; when the second pipe is made of carbon steel, the thermal conductivity of the material is 50 W / mK, and the cost is low.
[0028] In specific embodiments, the heat pipes are made of carbon steel, copper, aluminum or stainless steel; when the heat pipes are made of copper, the thermal conductivity of the material is 383 W / mK, and the heat conduction effect is good.
[0029] In specific embodiments, the material of the heat pipes is the same as that of the second pipe, so as to reduce the thermal resistance of the gap and enhance heat transfer.
[0030] In some embodiments, the inner wall surfaces of the channels and the heat pipes are provided with axial liquid absorption cores; the liquid absorption cores are in one or more of a wire mesh structure, a groove structure and a sintered structure; the liquid absorption cores are beneficial to the return flow of the condensed working medium and promote heat transfer.
[0031] The wire mesh structure refers to that the liquid absorption core is in a mesh structure.
[0032] The groove structure refers to that the liquid absorption core is in a groove structure.
[0033] The sintered structure is in the form of a sintered powder core, a sintered mesh core or a sintered fiber core; when the sintered structure is a sintered powder core, the porosity is about 50%; when the sintered structure is a sintered mesh core or a sintered fiber core, a heat pipe with a thinner thickness can be obtained.
[0034] In an embodiment, the inner wall of the heat pipe is provided with an axial distribution of wire mesh wicking cores, facilitating processing and rolling.
[0035] In some embodiments, the heating element is a heating tape; the heating tape is arranged around the outer surface of the first pipe.
[0036] In some embodiments, the thermal insulation material is a nanoparticle material, preferably a high-temperature-resistant aluminum silicate fiber with a temperature limit of more than 1000℃.
[0037] In the present application, a filling gap is reserved before filling the thermal insulation material into the second pipe, and the gap is filled with a filler after filling is completed.
[0038] In some embodiments, an aerogel filler is further arranged between the second pipe and the thermal insulation material.
[0039] In the present application, the number, arrangement and diameter of the heat pipes in the heat conduction structure can be designed and analyzed according to the operating temperature to avoid over-temperature of the concrete.
[0040] In some embodiments, the number of channels is the same as the number of heat pipes.
[0041] In some embodiments, the number of heat pipes is ≥10.
[0042] In some embodiments, the diameter of the heat pipe can be 0.8mm or 0.9mm.
[0043] In some embodiments, the inner diameter of the second pipe is 400mm.
[0044] In some embodiments, the thickness of the second pipe is ≤3cm.
[0045] In some embodiments, the cabin body comprises, from inside to outside of the cabin body, a cabin heat insulation layer, a safety container, a serpentine concrete layer and a common concrete layer; the first pipe penetrates through the cabin heat insulation layer, the safety container, the serpentine concrete layer and the common concrete layer.
[0046] The temperature limit of the serpentine concrete is 200℃, and the temperature limit of the common concrete is 70℃.
[0047] In the present application, the design of the molten salt reactor pile cabin makes the local temperature of the serpentine concrete and the common concrete in the molten salt reactor pile cabin lower than the design temperature; at the same time, the influence of the structure of the high-temperature first pipe on the molten salt reactor pile cabin shielding body also needs to meet the requirements of the molten salt reactor pile cabin shielding design, and the opening diameter of the molten salt reactor pile cabin concrete radiation shielding layer is ≤400mm.
[0048] In some embodiments, the heat-conducting structure is arranged in the common concrete layer.
[0049] In the utility model, the heat-conducting structure is arranged in the wall of the molten salt reactor vessel in the form of "penetration", and has the functions of "heat insulation and heat conduction".
[0050] In an embodiment, the second pipeline is a carbon steel pipe with DN40 and an inner diameter of 400 mm, and the number of heat pipes is greater than or equal to 10, which can ensure that the first pipeline can operate at 650 DEG C and the temperature of the common concrete is lower than the limit value.
[0051] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily, that is, the preferred examples of the utility model are obtained.
[0052] The utility model further has the following beneficial effects:
[0053] (1) Through the internal structure design of the molten salt reactor vessel, the heat in the molten salt reactor can be efficiently conducted out, thereby effectively reducing the hot spot temperature in the molten salt reactor vessel and reducing the temperature of the side wall of the reactor vessel, and effectively improving the thermal efficiency and reliability of the molten salt reactor vessel.
[0054] (2) The molten salt reactor vessel of the utility model makes full use of the high-efficiency heat transfer performance of the heat pipe, greatly reduces the thickness of the heat-conducting pipeline while ensuring the safety of the material, thereby reducing the use of the large-diameter thick second pipeline, reducing the difficulty of structure assembly, realizing the compact modularization of the reactor vessel, and the structure is simple and compact, easy to assemble and maintain, and can be applied to the heat insulation and heat conduction of various penetrating members of the reactor vessel. BRIEF DESCRIPTION OF DRAWINGS
[0055] Figure 1 It is a schematic view of the overall structure of the lower reactor vessel in the background art;
[0056] Figure 2 It is a structural schematic view of the heat-conducting structure in the molten salt reactor vessel of the embodiment 1 of the application;
[0057] Figure 3 It is a front view of the heat-conducting structure in the molten salt reactor vessel of the embodiment 1 of the application;
[0058] Figure 4 It is a side view of the heat-conducting structure in the molten salt reactor vessel of the embodiment 1 of the application;
[0059] Figure 5 It is a structural schematic view of the second pipeline of the heat-conducting structure in the molten salt reactor vessel of the embodiment 1 of the application;
[0060] Figure 6 It is a front view of the second pipeline of the heat-conducting structure in the molten salt reactor vessel of the embodiment 1 of the application;
[0061] Figure 7 The space filled with heat-conducting working medium of the heat-conducting structure in the reactor cavity of the molten salt reactor of Example 1 of the present application;
[0062] Figure 8 The cross-sectional view of the reactor cavity of Example 1 of the present application.
[0063] Explanation of reference signs:
[0064] Second pipe 1
[0065] Heat pipe 2
[0066] Thermal insulation material 3
[0067] Heating element 4
[0068] First pipe 5
[0069] Gap 6
[0070] Evaporation section 7
[0071] Condensation section 8
[0072] Passage 9
[0073] Suspender 10
[0074] Molten salt reactor 11
[0075] Reactor cavity thermal insulation layer 12
[0076] Safety container 13
[0077] Serpentine concrete layer 14
[0078] Ordinary concrete layer 15. DETAILED DESCRIPTION
[0079] The following preferred embodiments are listed below, and the present application is more clearly and completely illustrated in combination with the accompanying drawings.
[0080] Example 1
[0081] The present embodiment provides a reactor cavity of a molten salt reactor, which comprises a cavity body with an internal cavity, a first pipe 5 and a molten salt reactor 11 arranged in the internal cavity of the cavity body, one end of the first pipe 5 is in communication with the molten salt reactor 11, and the other end is located in the side wall surface of the cavity body for conducting heat out of the molten salt reactor 11, and a heat-conducting structure is further arranged in the side wall surface of the cavity body, and the heat-conducting structure is arranged around the one end of the first pipe 5 located in the side wall surface of the cavity body;
[0082] The cabin body comprises, from inside to outside of the cabin body, a cabin heat insulation layer 12, a safety container 13, a serpentine concrete layer 14 and a common concrete layer 15; the first pipeline 5 penetrates through the cabin heat insulation layer 12, the safety container 13, the serpentine concrete layer 14 and the common concrete layer 15; and the heat conduction structure is arranged in the common concrete layer 15.
[0083] Figure 2 A structural schematic view of the heat conduction structure in the cabin body of the molten salt reactor of the embodiment; Figure 3 A front view of the heat conduction structure in the cabin body of the molten salt reactor of the embodiment; Figure 4 A side view of the heat conduction structure in the cabin body of the molten salt reactor of the embodiment; the heat conduction structure comprises the heating element 4, the heat preservation material 3, the second pipeline 1 and 10 heat pipes 2; the total length of the heat conduction structure is 1 m, and the second pipeline 1 with a length of 1 m and a carbon steel material is used due to the short structure, the thickness of the second pipeline 1 is 2 cm, and the inner diameter of the second pipeline 1 is 400 mm; Figure 5 A structural schematic view of the second pipeline of the heat conduction structure in the cabin body of the molten salt reactor of the embodiment; Figure 6 A front view of the second pipeline of the heat conduction structure in the cabin body of the molten salt reactor of the embodiment; 10 channels 9 are arranged on one side end surface of the second pipeline 1, and the channels 9 extend to the other side end surface of the second pipeline 1, the diameter of the channel 9 is 0.8 mm, and the channel 9 is used as the evaporation section 7; methanol is used as the heat conduction working medium, the inner wall of the channel 9 is provided with a wire mesh liquid suction core, and the methanol in each channel 9 is encapsulated through the filling process of the heat pipe 2; 10 heat pipes 2 are arranged at the 10 channels 9 and located outside the cabin body of the molten salt reactor 11, and the length of the heat pipe 2 is 0.5 m; the heat pipe 2 used as the condensation section 8 dissipates heat in the air, and in order to enhance heat transfer, the outer part of each heat pipe 2 is provided with fins with a thickness of 0.5 mm, a spacing of 5 mm and a height of 1.2 cm. Figure 7 A space filled with the heat conduction working medium of the heat conduction structure in the cabin body of the molten salt reactor of the embodiment;
[0084] The heat pipe 2 in the embodiment is parallel to the central axis of the second pipeline 1 and slightly inclined upward, and the included angle with the horizontal plane is 5°, so as to more smoothly start and transfer heat.
[0085] Wherein, the nanoparticle material is used as the heat preservation material 3, the heating tape is used as the heating element 4, the heat preservation material 3 is wrapped in the heating tape wound on the first pipeline 5, and the second pipeline 1 is directly fixed and wrapped outside the heat preservation material 3, that is, the heat insulation and heat conduction assembly of the high-temperature first pipeline 5 is realized; if the assembly is completed, there is a mounting gap 6 between the second pipeline 1 and the heat preservation material 3, and the mounting gap 6 is filled with aerogel filler. When the core operating temperature of the molten salt reactor 11 and the heating temperature of the first pipeline 5 are 650 DEG C, the outdoor environment of the heat pipe 2 outside the reactor core of the molten salt reactor 11 is 30 DEG C, at this time, the heat transfer amount of the heat pipe 2 is 180 W, and the maximum temperature of the concrete outside the second pipeline 1 is lower than 65 DEG C, which meets the 70 DEG C use limit.
[0086] Figure 8 The cross-sectional view of the molten salt reactor core of the embodiment.
[0087] The heat conduction structure of the embodiment adopts an integrated molding mode, is suitable for a concrete wall with a relatively thin thickness (less than or equal to 1 m) or local heat dissipation application, has a simpler structure, and simplifies the reactor core structure. The working medium directly exchanges heat with the carbon steel, the thermal resistance is small, the efficiency is higher, the hotspot temperature in the molten salt reactor core is effectively reduced, the temperature of the side wall surface of the reactor core is reduced, and the heat efficiency and reliability of the molten salt reactor core are effectively improved.
[0088] Embodiment 2
[0089] The embodiment provides a molten salt reactor core. Wherein, the material of the second pipeline is carbon steel, the thickness is 3 cm, and the number of heat pipes and channels is 12; other conditions are the same as those in embodiment 1.
[0090] Comparative example 1
[0091] The comparative example is a molten salt reactor core. Wherein, the material of the second pipeline is carbon steel, the thickness is 10 cm, but the heat conduction structure in the molten salt reactor core is not provided with a channel, and the heat pipe connected to the outside is also not provided; other conditions are the same as those in embodiment 1.
[0092] Comparative example 2
[0093] The comparative example is a molten salt reactor core. Wherein, the material of the second pipeline is carbon steel, the thickness is 3 cm, but the heat conduction structure in the molten salt reactor core is not provided with a channel, and the heat pipe connected to the outside is also not provided; other conditions are the same as those in embodiment 1.
[0094] Effect embodiment 1
[0095] The second pipeline outer wall surface maximum temperature and average temperature are investigated in the effect embodiment to determine whether the temperature makes the concrete over-temperature. The analysis method uses ANSYS to model and simulate the through-penetration structure of the reactor cavity penetrator, the through-penetration outer wall is 700 DEG C, the heat pipe condensing section boundary is the convection heat transfer coefficient 5 W / m 2 K, and the reactor cavity air temperature is 30 DEG C.
[0096] Table 1 is the average temperature, maximum temperature and system total heat dissipation of the second pipeline in the reactor cavity of Comparative Examples 1-2 and Example 3.
[0097] Table 1
[0098]
[0099] As shown in Table 1, the average temperature and maximum temperature of the second pipeline outer wall of Example 2 are 55 DEG C and 55.3 DEG C respectively, which are lower than the average temperature and maximum temperature of the second pipeline outer wall of Comparative Examples 1 and 2; and the system total heat dissipation of Example 2 is 247 W, which is higher than the system total heat dissipation of Comparative Examples 1 and 2. It can be known that, by adding the heat pipe in the reactor cavity of the molten salt reactor and cooperating with other designs of the reactor cavity, the temperature of the second pipeline outer wall surface can be reduced, the average temperature and maximum temperature of the second pipeline outer wall surface are controlled to be within 60 DEG C, so as to meet the temperature limit value of ordinary concrete; and the local hot spot is eliminated.
Claims
1. A molten salt stack chamber, comprising a hollow chamber, a first pipe, and a molten salt stack disposed inside the chamber, wherein one end of the first pipe is connected to the molten salt stack, and the other end is located in the side wall of the chamber, for dissipating heat from the molten salt stack, characterized in that... The side wall of the cabin is also provided with a heat-conducting structure, which is located around one end of the first pipe in the side wall of the cabin. The heat-conducting structure includes a heating element, insulation material, a second pipe, and several heat pipes; the first pipe is partially disposed in the second pipe, the heating element is disposed on the outer surface of the first pipe, and the insulation material is filled in the gap between the second pipe and the first pipe; Several channels are provided on one end face of the second pipe near the outside of the chamber, and each channel extends to the other end face of the second pipe; each heat pipe is located outside the molten salt stack chamber and is provided on the side end face of the second pipe, and is connected to each channel to form a space filled with heat-conducting working fluid. Each of the aforementioned channels and each of the aforementioned heat pipes are parallel to the central axis of the second pipe, which is inclined upwards and has an angle of 1°-15° with the horizontal plane.
2. The molten salt stacking tank as described in claim 1, characterized in that, The angle between the second pipe and the horizontal plane is 3°-5°.
3. The molten salt stacking tank as described in claim 1, characterized in that, The heat pipe can be one of the following: tubular structure, plate structure, tube-fin structure, or plate-fin structure.
4. The molten salt stacking tank as described in claim 1, characterized in that, Each heat pipe is integrated with the second pipe in a single structure; The material of each heat pipe and the material of the second pipe are both carbon steel.
5. The molten salt stacking tank as described in claim 1, characterized in that, Both the channel and the inner wall of the heat pipe are provided with axially distributed liquid-absorbing cores; the liquid-absorbing cores are one or more of the following: wire mesh structure, groove structure, and sintered structure.
6. The molten salt stacking tank as described in claim 1, characterized in that, The heating element is a heating cable; the heating cable is wrapped around the outer surface of the first pipe.
7. The molten salt stacking tank as described in claim 1, characterized in that, The thermal insulation material is a nanoparticle material; Alternatively, an aerogel filler may be provided between the second pipe and the insulation material.
8. The molten salt stacking tank as described in claim 1, characterized in that, The thermally conductive structure satisfies one or more of the following conditions: ① The number of channels is the same as the number of heat pipes; ②The number of heat pipes is ≥10; ③The inner diameter of the second pipe is 400 mm; ④ The thickness of the second pipe is ≤3 cm.
9. The molten salt stacking tank as described in claim 1, characterized in that, The hull includes, from the inside out, a hull insulation layer, a safety container, a serpentine concrete layer, and a regular concrete layer; the first pipe passes through the hull insulation layer, the safety container, the serpentine concrete layer, and the regular concrete layer.
10. The molten salt stacking tank as described in claim 9, characterized in that, The heat-conducting structure is located within the ordinary concrete layer.