Non-metallic insulation structure for fast reactor container

Abstract

The present invention provides a non-metallic thermal insulation structure for a fast reactor container, comprising: a non-metallic thermal insulation layer, a support portion and a connection portion. The non-metallic thermal insulation layer is arranged in contact with the outer wall of the fast reactor container; the non-metallic thermal insulation layer is arranged between the outer wall of the fast reactor container and the support portion, and the support portion supports the non-metallic thermal insulation layer; the connection portion connects the support portion and the outer wall of the fast reactor container, and fixes the non-metallic thermal insulation layer to the outer wall of the fast reactor container.

Description

Technical Field

[0001] The present disclosure relates to the field of reactors, and in particular to a non-metallic thermal insulation structure for a fast reactor container. Background Art

[0002] In a sodium-cooled fast reactor, the temperature of the liquid metallic sodium in the reactor vessel is relatively high, exceeding 500°C. In order to reduce heat loss, reduce the temperature difference and thermal stress of the reactor vessel, and protect the concrete of the reactor pit, the insulation layers used in currently existing pressure vessels or corresponding pipelines are mostly difficult to meet the use requirements of sodium-cooled fast reactors. Summary of the invention

[0003] In one aspect, a non-metallic thermal insulation structure for a fast reactor container is provided, comprising: a non-metallic thermal insulation layer, a support portion, and a connection portion. The non-metallic thermal insulation layer is arranged in contact with the outer wall of the fast reactor container; the non-metallic thermal insulation layer is arranged between the outer wall of the fast reactor container and the support portion, and the support portion supports the non-metallic thermal insulation layer; the connection portion connects the support portion and the outer wall of the fast reactor container, and fixes the non-metallic thermal insulation layer to the outer wall of the fast reactor container. BRIEF DESCRIPTION OF THE DRAWINGS

[0004] Other objects and advantages of the present disclosure will be apparent from the following description of the present disclosure with reference to the accompanying drawings, and will help to have a comprehensive understanding of the present disclosure.

[0005] Figure 1 It is a schematic diagram of the structure of a fast reactor container according to some exemplary embodiments of the present disclosure.

[0006] Figure 2 It is a schematic diagram of some exemplary non-metallic insulation structures installed in the midsole head area of ​​the present invention.

[0007] Figure 3 yes Figure 2 A partial view of area A in the middle.

[0008] Figure 4 It is a schematic diagram of some exemplary non-metallic insulation structures installed in the middle cylinder area of ​​the present invention.

[0009] Figure 5 It is a schematic diagram of installing a non-metallic thermal insulation structure in the bellows area of ​​some exemplary protection containers disclosed in the present invention.

[0010] Figure 6 It is a schematic diagram of some exemplary non-metallic insulation structures installed in the middle cone top cover area of ​​the present invention.

[0011] Figure 7 for Figure 6 Partial view of area B in the middle.

[0012]

Figure Number

[0013] 1-Bottom head area;

[0014] 2- barrel area;

[0015] 3- Protect the container bellows area;

[0016] 4- cone cap area;

[0017] 5-Outer wall of fast reactor vessel;

[0018] 6- Non-metallic insulation layer;

[0019] 7- Hoop frame;

[0020] 8-Skinning;

[0021] 9-hoop frame seat;

[0022] 10- welding backing plate;

[0023] 11- first fastener;

[0024] 12- first support plate;

[0025] 13- second support plate;

[0026] 14-Filling insulation layer;

[0027] 15- ear plate;

[0028] 16-guard plate;

[0029] 17-Support arc plate.

[0030] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0032] Unless otherwise defined, the technical terms or scientific terms used in this disclosure should be understood by ordinary technicians in the field. "First", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0033] In this document, unless otherwise specified, directional terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present disclosure, and do not indicate or imply that the device, element or component referred to must have a specific orientation, be constructed or operate in a specific orientation. It should be understood that when the absolute position of the described object changes, the relative positional relationship they represent may also change accordingly. Therefore, these directional terms should not be understood as limiting the present disclosure.

[0034] The embodiment of the present disclosure provides a non-metallic thermal insulation structure for a fast reactor container, comprising: a non-metallic thermal insulation layer, a support portion and a connection portion. The non-metallic thermal insulation layer is arranged in contact with the outer wall of the fast reactor container; the non-metallic thermal insulation layer is arranged between the outer wall of the fast reactor container and the support portion, and the support portion supports the non-metallic thermal insulation layer; the connection portion connects the support portion and the outer wall of the fast reactor container, and fixes the non-metallic thermal insulation layer to the outer wall of the fast reactor container.

[0035] Figure 1 Schematic diagram of the structure of a fast reactor container according to some exemplary embodiments of the present disclosure. Figure 1 As shown, the structure of the fast reactor container is first introduced here, which is generally divided into the bottom head area 1, the cylinder area 2, the protective container bellows area 3 and the cone top cover area 4. The connection structure adopted in each area is slightly different to adapt to the structure of the fast reactor container corresponding to each area.

[0036] In some embodiments of the present disclosure, a non-metallic thermal insulation structure is provided in which the bottom head area 1 is located in an elliptical head.

[0037] Figure 2 It is a schematic diagram of some exemplary non-metallic insulation structures installed in the midsole head area of ​​the present invention. Figure 3 yes Figure 2 A local map of area A. Figure 2 , Figure 3 As shown, the welding pad is fixed to the inner wall of the fast reactor container; one end of the first anchor bolt is fixedly connected to the welding pad, and the other end of the first anchor bolt passes through the bolt hole provided on the hoop frame 7 and is fixedly connected to the nut. The skin 8 is provided between the hoop frame 7 and the outer wall 5 of the fast reactor container, and is connected to the outer wall 5 of the fast reactor container.

[0038] The specific installation is as follows: first, the welding plate is welded to the elliptical head of the stack container, the stainless steel anchor bolts are welded to the welding plate, and the non-metallic insulation layer 6 is pressed against the stack container wall through the hoop frame 7. The bolt holes on the hoop frame 7 are set as oblong holes to compensate for the thermal expansion in the cold and hot states. The insulation hoop frame 7 is also covered with a stainless steel skin.

[0039] The following is a detailed introduction to the non-metallic thermal insulation layer 6. The working principle of the non-metallic thermal insulation layer 6 structure is a thermal insulation structure that blocks heat conduction, inhibits heat convection, and blocks heat radiation.

[0040] Specifically, the structure of the non-metallic thermal insulation layer 6 can be made of nanoporous composite insulation felt as the internal material, special glass fiber cloth wrapped on the outer surface, and stainless steel wire reinforced with glass fiber wire sewn together.

[0041] In some embodiments of the present disclosure, the support portion includes: a hoop frame 7. The non-metallic thermal insulation layer 6 is arranged between the hoop frame 7 and the outer wall 5 of the fast reactor container, and the non-metallic thermal insulation layer is supported by the hoop frame 7. The fastener passes through the hoop frame 7 and the non-metallic thermal insulation layer 6 to be fixedly connected on the outer wall surface of the hoop frame 7. The hoop frame 7 can be a stainless steel hoop.

[0042] In some specific embodiments, a hoop frame seat 9 is further included. The hoop frame seat 9 serves as a support for the stainless steel bar hoop. The fastener is a stainless steel anchor bolt. One end of the stainless steel anchor bolt is connected to the outer wall 5 of the fast reactor container through the stainless steel bar hoop (hoop frame seat) and the non-metallic insulation layer 6, and the other end of the stainless steel anchor bolt is connected to the nut. The stainless steel anchor bolt and the nut can be spot welded to prevent loosening.

[0043] In some embodiments of the present disclosure, the support portion further includes: a skin 8. The skin 8 can be arranged on both sides of the non-metallic thermal insulation layer 6, or completely cover the outer wall surface of the non-metallic thermal insulation layer 6. As a load-bearing component covering the outside of the non-metallic thermal insulation layer 6, the skin 8 can be fixed to the non-metallic thermal insulation layer 6 by adhesive or rivets outside the non-metallic thermal insulation layer 6 to form a dimensional component of the shape of the non-metallic thermal insulation layer 6. The skin structure formed by the skin 8 and the non-metallic thermal insulation layer 6 has a large bearing capacity and rigidity, but a very light weight, and plays a role in bearing and transmitting aerodynamic loads.

[0044] In some specific embodiments, the skin 8 is disposed on the side of the non-metallic insulation layer 6 close to the outer wall 5 of the fast reactor container, which can also be understood as attaching the skin 8 to the inner wall surface of the non-metallic insulation layer 6.

[0045] In some specific embodiments, the skin 8 is disposed on the side of the non-metallic insulation layer 6 away from the outer wall 5 of the fast reactor container, and is located between the non-metallic insulation layer 6 and the hoop 7. Here, it can also be understood that the skin 8 is attached to the outer wall surface of the non-metallic insulation layer 6.

[0046] In some specific embodiments, the skin 8 completely covers the entire outer wall surface of the non-metallic thermal insulation layer 6 .

[0047] In some embodiments, in order to increase the fit between the stainless steel skin 8 and the non-metallic insulation layer 6, in addition to the hoop 7 position, a number of anchoring studs are arranged in the middle of the hoop 7 position to fix and press the non-metallic insulation layer 6 and the skin 8. Furthermore, the anchor bolts and nuts are spot welded to prevent loosening. The non-metallic insulation layer 6 of the elliptical head is also supported on the support skirt at the other end by a radial connecting strip.

[0048] In some embodiments of the present disclosure, a non-metallic thermal insulation structure of the barrel area is provided.

[0049] Figure 4 Schematic diagram of some exemplary non-metallic insulation structures installed in the cylinder area of ​​the present disclosure. Figure 4 As shown, first, the welding pad is welded to the outer wall 5 of the fast reactor container, specifically to the elliptical head of the container. The stainless steel anchor bolts are welded to the welding pad, and the non-metallic insulation layer 6 is pressed against the outer wall 5 of the fast reactor container through the insulation hoop 7. In order to compensate for the thermal expansion in the cold and hot states, the bolt holes on the hoop 7 are set as oblong holes. There is also a stainless steel skin 8 outside the insulation hoop 7. In order to improve the supporting strength of the non-metallic insulation layer 6, a plurality of second support plates are also arranged inside the non-metallic insulation layer 6. Specifically, the second support plate can be a heat preservation block support plate.

[0050] In some embodiments of the present disclosure, a non-metallic thermal insulation structure is provided for protecting a bellows area of ​​a container.

[0051] Figure 5 Schematic diagram of non-metallic insulation structure installed in the bellows area of ​​some exemplary protective containers in the present disclosure. Figure 5 As shown, in order to adapt to the shape of the bellows of the protective container, the non-metallic insulation layer 6 outside the bellows is fixed to the stainless steel protective plate around the bellows through the lower supporting arc plate and the upper ear plate, and the non-metallic insulation layer 6 and the skin 8 are fixed to the protective plate by stainless steel anchor bolts. Between the stainless steel protective plate and the bellows, nano new materials are filled as a filling insulation layer. The thermal expansion difference between the stainless steel protective plate and the bellows is released by the stainless steel protective plate along the upper lap groove.

[0052] In some embodiments of the present disclosure, a non-metallic thermal insulation structure of the cone top cover area is provided.

[0053] Figure 6 It is a schematic diagram of some exemplary non-metallic insulation structures installed in the middle cone top cover area of ​​the present invention. Figure 7 for Figure 6 A partial view of area B in the figure. Figure 6 , Figure 7 As shown, firstly, the welding pad is welded to the elliptical head of the stack container, the stainless steel anchor bolts are welded to the welding pad, the non-metallic insulation layer 6 is pressed against the stack container wall through the hoop, and in order to compensate for the thermal expansion in the cold and hot states, the bolt holes on the hoop are set as oblong holes. There is also a stainless steel skin 8 outside the hoop.

[0054] The axial gap between the soft insulation blocks caused by the thermal expansion of the equipment is compensated by cold installation and compaction.

[0055] The material of the non-metallic insulation layer 6 is introduced in detail.

[0056] The material of the non-metallic thermal insulation layer 6 is a nanoporous aerogel composite thermal insulation material, such as silicon dioxide, etc. The thermal conductivity of the non-metallic thermal insulation layer 6 is 0.0206-0.0406 W / m·k.

[0057] The change between the thermal conductivity of the non-metallic thermal insulation layer 6 before irradiation and the thermal conductivity of the non-metallic thermal insulation layer 6 after irradiation is less than a specified thermal conductivity error. For example, the specified thermal conductivity error may be 5%.

[0058] The change between the size of the non-metallic thermal insulation layer 6 before irradiation and the size of the non-metallic thermal insulation layer 6 after irradiation is less than a specified size error. For example, the specified size error may be 0.42%.

[0059] The non-metallic insulation layer 6 material has been tested for irradiation in the reactor. As shown in Table 1 below, the mechanical properties, thermal conductivity and dimensional changes after irradiation are tested. The material can maintain most of the mechanical properties after irradiation, and the thermal conductivity and dimensional changes are within the measurement error range. The material can be used in reactor devices such as reactor vessels.

[0060] Table 1

[0061]

[0062] The test results of thermal conductivity are shown in Table 1. The change rates of thermal conductivity before and after irradiation at 100℃, 200℃, 300℃, 400℃ and 500℃ are -0.5%, 1.7%, -1.1%, 1.8% and -0.2% respectively. The change fluctuates around 0%. In addition, the test accuracy of the thermal conductivity tester itself is ≤5%, so it can be considered that the above change of thermal conductivity is within the test error range.

[0063] The fixing device of the non-metallic insulation layer 6 has been subjected to stress analysis and evaluation, and the connection structure can maintain structural integrity under seismic loads. In addition, the fixing device fully considers the displacement compensation of the thermal expansion of the container.

[0064] The non-metallic thermal insulation structure for a fast reactor container according to an embodiment of the present disclosure has at least one of the following technical effects:

[0065] (1) Nanoporous aerogel composite insulation materials with low thermal conductivity, light weight and radiation resistance can be used in reactor devices after being subjected to the irradiation test.

[0066] (2) The connection structure adopted in the present disclosure can maintain structural integrity under earthquake loads.

[0067] Although some embodiments according to the overall technical concept of the present disclosure have been shown and described, those skilled in the art will appreciate that changes may be made to these embodiments without departing from the principles and spirit of the overall technical concept of the present disclosure, and the scope of the present disclosure is defined by the claims and their equivalents.

Claims

1. A non-metallic thermal insulation structure for a fast reactor container, characterized in that: include: The non-metallic thermal insulation layer is arranged in close contact with the outer wall of the fast reactor container; A support portion, wherein the non-metallic thermal insulation layer is disposed between the outer wall of the fast reactor container and the support portion, and the support portion supports the non-metallic thermal insulation layer; A connecting portion, connecting the supporting portion and the outer wall of the fast reactor container, fixing the non-metallic thermal insulation layer to the outer wall of the fast reactor container; The support portion comprises: A hoop frame, wherein the non-metallic thermal insulation layer is disposed between the hoop frame and the outer wall of the fast reactor container, and the hoop frame is connected to the outer wall of the fast reactor container; The hoop supports the non-metallic thermal insulation layer; The connecting portion comprises: A welding backing plate fixedly connected to the outer wall of the fast reactor container; A first fastener, one end of which is fixedly connected to the welding pad, and the other end of which is fixedly connected to the supporting portion; The first fastener passes through the hoop frame and the non-metallic thermal insulation layer to be fixedly connected to the outer wall surface of the hoop frame; The welding pad is welded to the outer wall of the fast reactor container.

2. The non-metallic thermal insulation structure according to claim 1, characterized in that: The support portion further comprises: The skin is arranged on a side of the non-metallic thermal insulation layer away from the outer wall of the fast reactor container and is located between the non-metallic thermal insulation layer and the hoop.

3. The non-metallic thermal insulation structure according to claim 1, characterized in that: The support portion is provided with an oblong hole, and the first fastener is cooperatively connected with the oblong hole.

4. The non-metallic thermal insulation structure according to claim 1, characterized in that: The non-metallic insulation layer comprises: Nanoporous composite insulation felts; and The non-metal coating layer is coated on the outside of the nanoporous composite insulation felt.

5. The non-metallic thermal insulation structure according to any one of claims 1 to 4, characterized in that: The fast reactor container includes a bottom head area, and in the bottom head area of ​​the fast reactor container, the support part also includes: a first support plate, configured to support the end of the non-metallic insulation layer; the support part also includes: a second fastener, and the first support plate is fastened to the non-metallic insulation layer through the second fastener.

6. The non-metallic thermal insulation structure according to any one of claims 1 to 4, characterized in that: The fast reactor container includes a barrel region, and in the barrel region of the fast reactor container, the support portion further includes: at least one second support plate embedded in the non-metallic thermal insulation layer.

7. The non-metallic thermal insulation structure according to claim 6, characterized in that: The non-metallic insulation layer comprises a plurality of insulation blocks, which are spliced ​​and connected; the support portion is arranged at a position where two of the insulation blocks are joined.

8. The non-metallic thermal insulation structure according to any one of claims 1 to 4, characterized in that: The fast reactor container includes a protective container bellows region, and in the protective container bellows region of the fast reactor container, the non-metallic thermal insulation structure further includes a filling thermal insulation layer, which is arranged between the inner wall of the fast reactor container and the non-metallic thermal insulation layer; as well as In the protective container bellows area of ​​the fast reactor container, the support part also includes: a supporting arc plate, which is clamped on the bottom of the filling insulation layer; an ear plate part, the filling insulation layer and the non-metallic insulation layer are sandwiched between the ear plate part and the supporting arc plate; a guard plate, the guard plate is arranged between the filling insulation layer and the non-metallic insulation layer, one end of the guard plate is fixedly connected to the supporting arc plate, and the other end of the guard plate is clamped on the ear plate part.

9. The non-metallic thermal insulation structure according to any one of claims 1 to 4, characterized in that: The change value between the thermal conductivity of the non-metallic thermal insulation layer before irradiation and the thermal conductivity of the non-metallic thermal insulation layer after irradiation is less than a specified thermal conductivity error.

10. The non-metallic thermal insulation structure according to any one of claims 1 to 4, characterized in that: The change between the size of the non-metallic thermal insulation layer before irradiation and the size of the non-metallic thermal insulation layer after irradiation is less than a specified size error.

11. The non-metallic thermal insulation structure according to any one of claims 1 to 4, characterized in that: The thermal conductivity of the non-metallic thermal insulation layer is 0.0206-0.0406 W / m·k.

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