CN212727469U - Metal working medium bottom heating device - Google Patents
Metal working medium bottom heating device Download PDFInfo
- Publication number
- CN212727469U CN212727469U CN202020784548.0U CN202020784548U CN212727469U CN 212727469 U CN212727469 U CN 212727469U CN 202020784548 U CN202020784548 U CN 202020784548U CN 212727469 U CN212727469 U CN 212727469U
- Authority
- CN
- China
- Prior art keywords
- heat
- working medium
- graphite heater
- metal working
- induction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- General Induction Heating (AREA)
Abstract
The utility model provides a metal working medium bottom heating device, include: the graphite heater heats the metal working medium according to electromagnetic induction generated after the induction coil is electrified; the induction coil converts high-frequency alternating current generated by the power supply into a high-frequency alternating current electromagnetic field so as to provide electromagnetic induction for the graphite heater; the heat-insulating sleeve provides a bearing space for the metal working medium and provides heat-insulating and heat-insulating effects; the bottom heat-insulating layer is in a gap with the bottom of the graphite heater and is used for heat insulation; the coil heat-insulating layer is used for supporting the graphite heater and insulating the graphite heater; and the high-temperature measuring hole is used for monitoring the temperature of the graphite heater and controlling the power of the induction coil according to the temperature. The utility model discloses can heat metal working medium to the molten condition fast to ensure metal level heat transfer boundary condition and reactor serious accident condition similarity, make the test data of developing high temperature liquid metal heat transfer and the relevant experiment of material more have engineering guidance value.
Description
Technical Field
The utility model relates to a reactor thermal technology hydraulic test technical field, in particular to metal working medium bottom heating device.
Background
After the reactor core of the pressurized water reactor nuclear power plant is melted, the fuel elements and the reactor internals are melted due to insufficient cooling, and a layered molten pool structure is formed at the bottom of the pressure vessel. The upper layer of the bath is a less dense metal layer, mainly consisting of molten stainless steel and non-oxidized zirconium, at a temperature of about 1600K. The main heat transfer process of the metal layer is as follows: the lower part is heated through the bottom to the top metal level by the higher oxide intralamellar decay heat of temperature, and the top is passed through the radiation and is carried out the heat transfer to the outside, and the lateral part is then carried out the heat transfer to the pressure vessel lateral wall through the convection current. Due to the fact that the metal layer is thin and the contact area of the metal layer and the container wall is small, heat transfer is concentrated, the heat flow density is high, and the integrity of the pressure container is threatened greatly. In the research related to the retention and mitigation measures in the pressure vessel stack, which is carried out with the aim of reducing the heat flow density of the side wall of the metal layer, it is necessary to carry out a heat transfer characteristic test of the high-temperature liquid metal of the prototype material, so as to provide direct data support for the safety analysis program of the reactor.
The most key basic condition of the high-temperature molten metal layer heat transfer test is a reliable molten material bottom heating device which is used for providing heat required by a metal working medium to reach the liquid phase temperature and maintaining stable bottom-upward heat flow. The conventional test apparatus for high-temperature molten metal layer can be classified into two types according to the heating method: induction heating, direct heating with an electric heating rod (ELIAS device). The anis and HITEC devices using induction heating technology can achieve 1700K operating temperature, but the heater forms and materials are different. Among them, the anisi was designed by french CEA, using a zirconia ceramic crucible as a liquid metal holding container, and heating of about 20kg of stainless steel to a molten state was achieved. The HITEC skid, university of California, USA, used an induction heating graphite crucible and lined with a steel crucible to rapidly heat a mixture of about 13g of ferrozirconium metal to 1410 ℃. However, the two heating methods are both bottom and side wall heating at the same time, and because the induction heating is adopted, an internal heat source exists in the molten metal, the heating condition is different from that of a single bottom under a real condition, and the influence on heat exchange is difficult to evaluate. Therefore, the korean ELIAS apparatus selects a simulated low melting point metal for conducting the test, and heats the zinc metal to 700K by direct heating with a bottom heating plate. However, due to the difference in the thermal properties of the mixture of metallic zinc and ferrozirconium, the results are still to be evaluated.
Specifically, the core part of the HITEC test device is a graphite crucible and a stainless steel crucible lined with the graphite crucible, and the periphery of the graphite crucible is covered by a heat insulation material. In order to avoid the oxidation of the crucible and the ferrozirconium working medium in the air under the high temperature condition, a glass surrounding barrel is adopted for sealing, and argon is filled for protection. The induction coil is positioned outside the side wall of the glass surrounding barrel, the graphite crucible is heated through induction, heat is conducted to the stainless steel and the ferrozirconium working medium, the mixture of 13g of ferrozirconium metal powder can be heated to 1410 ℃, and the heating time is about 3-4 hours. The inner diameter of the steel crucible in the technical scheme is 12.7mm, the inner height is 25.4mm, and the mass of the working medium for carrying out the test is small and is about 13 g. In addition, the melting point of a mixture corresponding to 4.8-8.8% of zirconium (mole fraction) as a test working medium is about 1335 ℃, and the temperature is below the melting point of the steel crucible, so that the steel crucible with the thickness of 6.35mm can be kept complete in the test process, and the steel crucible is corroded by a certain thickness after the test is finished, so that the component proportion of the working medium in a molten pool is changed. Meanwhile, after the components of the test working medium are changed and the melting point is increased, the steel crucible can be completely melted, for example, when the mole fraction of zirconium is increased to 33%, the corresponding melting point of the working medium is 1675 ℃, so that the temperature application range of the technical scheme is limited.
The anisi was designed by french CEA using a cold crucible induction heating technology to load a zirconia crucible liquid metal having a diameter of 200mm into a container, from which an alumina sleeve, a water-cooled copper crucible, glass fibers and an induction coil were placed in order. The whole testing device is positioned in the safety protection chamber and protected by inert gas. The induction coil directly inductively heated about 20kg of 304 stainless steel in the zirconia crucible to 1650 ℃ to a molten state. The induction coil is adopted to directly and electromagnetically heat the metal working medium, so that the electromagnetic stirring force exists in the metal working medium when an internal heat source exists, and the electromagnetic stirring force is obviously different from the Rayleigh-Berard thermal convection (driven by the temperature difference between the bottom and the upper part and has no other external force) which is typical for the internal flow of the metal layer under the prototype condition, therefore, the influence of the electromagnetic induction scheme adopted by the test device on the flow and the heat transfer in the molten pool is difficult to evaluate.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of above-mentioned technical problem at least.
Therefore, the present invention is directed to a bottom heating device for metal working medium, which can heat the metal working medium to a molten state quickly and ensure that the boundary condition of heat transfer of the metal layer is the bottom upward heat transfer.
In order to achieve the above object, the utility model provides a metal working medium bottom heating device, include: the graphite heater is used for heating the metal working medium according to electromagnetic induction generated after the induction coil is electrified; the induction coil is positioned at the periphery of the graphite heater and used for converting high-frequency alternating current generated by a power supply into a high-frequency alternating current electromagnetic field so as to provide electromagnetic induction for the graphite heater; the heat-insulating sleeve is used for providing a bearing space for the metal working medium and providing heat insulation and heat insulation effects; the bottom heat-insulating layer is positioned at the bottom of the graphite heater, and a gap is formed between the bottom heat-insulating layer and the bottom of the graphite heater for heat insulation; the coil heat-insulating layer is used for supporting the graphite heater and insulating the graphite heater; and the high-temperature measuring hole is used for monitoring the temperature of the graphite heater and controlling the power of the induction coil according to the temperature.
In addition, according to the utility model discloses foretell metal working medium bottom heating device can also have following additional technical characterstic:
in some examples, the graphite heater is composed of three parts, namely an induction heating area, a flat heat conducting area and a side sealing area, wherein the thickness of the flat heat conducting area is larger than the thickness of a skin layer under the selected condition, so as to shield the influence of an electromagnetic field on the metal working medium and provide stable heat flow for the metal working medium; the side sealing area is selectively of an upward turning structure; the induction coil is positioned at the periphery of the induction heating area and is positioned at the lower part of the flat heat conduction area.
In some examples, the induction heating zone is configured as a cylindrical, barrel, square, or hollow square structure, and current is passed through the induction coil to generate eddy currents in the induction heating zone to heat the induction heating zone.
In some examples, the induction heating zone is configured as a cylindrical, barrel, square, or hollow square structure, and current is passed through the induction coil to generate eddy currents in the induction heating zone to heat the induction heating zone.
In some examples, the induction coil is a spiral water-cooling copper pipe, and cooling water is introduced into the spiral water-cooling copper pipe.
In some examples, the insulative sleeve includes an insulative inner sleeve and an insulative outer sleeve.
In some examples, the coil insulation layer includes: lay in inside coil heat preservation inside the induction coil with lay in outside coil heat preservation outside the induction coil, the inside coil heat preservation is used for shielding electromagnetic induction, the outside coil heat preservation is used for providing support and heat preservation effect.
In some examples, the high temperature measuring hole monitors the temperature of the graphite heater by means of a high temperature thermocouple or infrared temperature measurement.
In some examples, the high temperature thermocouple is mounted on the graphite heater using a sidewall insertion.
In some examples, the graphite heater is constructed of a high purity, static pressure graphite material.
According to the utility model discloses a metal working medium bottom heating device can realize the speed and heat the metal working medium to the molten state to provide stable upward heat flow by the molten metal bottom, be used for carrying out high temperature liquid metal heat transfer and material relevant test, ensure that metal level heat transfer boundary condition is similar with the reactor serious accident condition, the experimental data who obtains more has engineering guiding value; in addition, a uniform temperature gradient within the molten metal can be ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a metal working medium bottom heating device according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a graphite heater according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes a metal working medium bottom heating device according to an embodiment of the present invention with reference to the drawings.
Fig. 1 is a schematic structural diagram of a metal working medium bottom heating device according to an embodiment of the present invention.
As shown in fig. 1, the metal working medium bottom heating device comprises: graphite heater 1, induction coil 2, heat preservation sleeve, bottom heat preservation 5, coil heat preservation and high temperature thermocouple hole 8.
The graphite heater 1 is used for heating the metal working medium 9 according to electromagnetic induction generated after the induction coil 2 is electrified.
The induction coil 2 is located at the periphery of the graphite heater 1 and is used for converting high-frequency alternating current generated by a power supply into a high-frequency alternating current electromagnetic field so as to provide electromagnetic induction for the graphite heater 1.
The heat-insulating sleeve is used for providing a bearing space for the metal working medium 9 and providing heat insulation and heat insulation effects.
The bottom heat preservation layer 5 is positioned at the bottom of the graphite heater 1, and a gap exists between the bottom heat preservation layer and the bottom of the graphite heater 1 for heat preservation and heat insulation. Specifically, the bottom heat-insulating layer 5 is positioned at the bottom of the graphite heater 1, and a gas space can be left or not left between the bottom heat-insulating layer and the bottom of the graphite heater 1, so that the bottom of the heating body has better heat-insulating effect.
The coil heat-insulating layer is used for supporting the graphite heater and insulating the graphite heater.
The high-temperature measuring hole 8 is used for monitoring the temperature of the graphite heater 1 and controlling the power of the induction coil 2 according to the temperature.
In one embodiment of the present invention, as shown in fig. 2, the graphite heater 1 is composed of three parts, i.e. an induction heating zone 11, a flat heat conducting zone 12 and a side sealing zone 13, for providing a stable upward flow density for the bottom of the liquid zircaloy metal and ensuring that the liquid metal working medium does not leak from the side wall of the graphite heater 1 under the test conditions.
Specifically, the thickness of the flat plate heat conducting area 12 is larger than the thickness of the skin layer under the selected condition, so as to shield the influence of the electromagnetic field on the metal working medium 9 and provide stable heat flow for the metal working medium 9; the side sealing area 13 is selectively of an upturned edge structure; the induction coil 2 is located at the periphery of the induction heating area 11 and at the lower part of the plate heat conduction area 12.
The graphite heater 1 is a core heating component of the test device, and the graphite heater 1 is made of high-purity static pressure graphite materials and can bear high temperature of about 2800 ℃ in an inert gas environment. The lower part of the graphite heater 1 is an induction heating area 11 which is heated under the action of the induction coil 2; the heat is transferred to the metal working medium 9 above through the flat heat conducting area 12.
In some examples, the induction heating zone 11 is configured as a cylindrical, barrel, square or hollow square structure, the current passing through the induction coil 2 generates eddy currents in the induction heating zone 11 to heat the induction heating zone 11, and the upper portion of the graphite heater 1 may or may not have a lip between the induction coil 2 and the insulating inner sleeve 3.
Specifically, after the induction coil 2 is electrified, the graphite heater 1 generates heat under the action of electromagnetic induction, and the heat is upwards transferred to the upper metal working medium 9 through the graphite crucible. The graphite heater 1 can be roughly divided into three parts, namely an induction heating area 11, a flat heat-conducting area 12 and a side sealing area 13. The thickness of the flat heat conducting area 12 is larger than the thickness of the skin layer under the selected condition, so that the flat heat conducting area is used for shielding the influence of an electromagnetic field on the metal working medium 9, avoiding the electromagnetic induction heating of the metal working medium 9, and providing stable heat flow upwards. The graphite sides may or may not optionally have upturned edge structures. The induction coil 2 is located at the periphery of the induction lower induction heating zone 11 and below the plate heat conduction zone 12.
In some examples, the induction coil 2 is a spiral water-cooled copper pipe, and cooling water is introduced into the copper pipe. The induction coil 2 converts a high-frequency alternating current generated by a power supply into a high-frequency alternating current electromagnetic field, and inductively heats the graphite heater 1.
Specifically, the induction coil 2 is located at the periphery of the induction heating area 11 and below the flat heat conduction area 12, and converts a high-frequency alternating current generated by a power supply into a high-frequency alternating electromagnetic field to heat the induction heating area 11.
The heat-insulating sleeve comprises a heat-insulating inner sleeve 3 and a heat-insulating outer sleeve 4. The heat-preservation inner sleeve 3 and the heat-preservation outer sleeve 4 are used for providing a bearing space for the working medium to be heated and providing heat preservation and heat insulation functions.
The coil heat preservation includes: lay the inside coil heat preservation 6 of locating induction coil inside and lay the outside coil heat preservation 7 of locating induction coil outside, inside coil heat preservation 6 is used for shielding electromagnetic induction, and outside coil heat preservation 7 is used for providing support and heat preservation effect. In other words, the bottom insulating layer is laid inside and outside the induction coil 2, the selection of the inner insulating material and the structure of the coil needs to be satisfied, and the outer insulating layer further provides the supporting and insulating functions.
The high-temperature measuring hole 8 is arranged on the graphite heater 1, and is used for monitoring the temperature of the graphite heater 1 in a high-temperature thermocouple or infrared temperature measuring mode and the like, so that on one hand, the high-temperature measuring hole is used for monitoring the temperature of the graphite without overtemperature, and the safety of the graphite heater 1 is ensured; and on the other hand for controlling the heating power of the induction coil 2.
Specifically, the high-temperature thermocouple is installed on the graphite heater 1 in a side wall insertion mode, penetrates through the heat insulation layer, and is convenient to install.
According to the utility model discloses metal working medium bottom heating device can realize the speed and heat the metal working medium to the molten state to provide stable upward heat flow by the molten metal bottom, be used for developing high temperature liquid metal heat transfer and material relevant test, ensure that metal level heat transfer boundary condition is similar with the serious accident condition of reactor, the experimental data who obtains has engineering guidance value more; in addition, a uniform temperature gradient within the molten metal can be ensured.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A metal working medium bottom heating device is characterized by comprising:
the graphite heater is used for heating the metal working medium according to electromagnetic induction generated after the induction coil is electrified;
the induction coil is positioned at the periphery of the graphite heater and used for converting high-frequency alternating current generated by a power supply into a high-frequency alternating current electromagnetic field so as to provide electromagnetic induction for the graphite heater;
the heat-insulating sleeve is used for providing a bearing space for the metal working medium and providing heat insulation and heat insulation effects;
the bottom heat-insulating layer is positioned at the bottom of the graphite heater, and a gap is formed between the bottom heat-insulating layer and the bottom of the graphite heater for heat insulation;
the coil heat-insulating layer is used for supporting the graphite heater and insulating the graphite heater;
and the high-temperature measuring hole is used for monitoring the temperature of the graphite heater and controlling the power of the induction coil according to the temperature.
2. The metal working fluid bottom heating device according to claim 1, wherein the graphite heater is composed of three parts, an induction heating zone, a flat heat conducting zone and a side sealing zone, wherein,
the thickness of the flat heat conducting area is larger than that of the skin layer under the selected condition, and the flat heat conducting area is used for shielding the influence of an electromagnetic field on the metal working medium and providing stable heat flow for the metal working medium;
the side sealing area is selectively of an upward turning structure;
the induction coil is positioned at the periphery of the induction heating area and is positioned at the lower part of the flat heat conduction area.
3. The metal working fluid bottom heating device according to claim 2, wherein the induction heating zone is configured in a column, barrel or square shape, and an eddy current is generated in the induction heating zone by the induction coil to heat the induction heating zone.
4. The metal working medium bottom heating device of claim 1, wherein the induction coil is a helical water-cooled copper pipe, and cooling water is introduced into the induction coil.
5. The metal working medium bottom heating device of claim 1, wherein the heat-insulating sleeve comprises a heat-insulating inner sleeve and a heat-insulating outer sleeve.
6. The metal working medium bottom heating device of claim 1, wherein the coil insulation layer comprises: lay in inside coil heat preservation inside the induction coil with lay in outside coil heat preservation outside the induction coil, the inside coil heat preservation is used for shielding electromagnetic induction, the outside coil heat preservation is used for providing support and heat preservation effect.
7. The metal working medium bottom heating device according to claim 1, wherein the high temperature measuring hole monitors the temperature of the graphite heater by means of a high temperature thermocouple or infrared temperature measurement.
8. The metal working medium bottom heating device of claim 7, wherein the high temperature thermocouple is mounted on the graphite heater in a side wall insertion manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020784548.0U CN212727469U (en) | 2020-05-12 | 2020-05-12 | Metal working medium bottom heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020784548.0U CN212727469U (en) | 2020-05-12 | 2020-05-12 | Metal working medium bottom heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212727469U true CN212727469U (en) | 2021-03-16 |
Family
ID=74945313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020784548.0U Active CN212727469U (en) | 2020-05-12 | 2020-05-12 | Metal working medium bottom heating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212727469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351269A (en) * | 2022-09-22 | 2022-11-18 | 肇庆本田金属有限公司 | Transfer device |
-
2020
- 2020-05-12 CN CN202020784548.0U patent/CN212727469U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351269A (en) * | 2022-09-22 | 2022-11-18 | 肇庆本田金属有限公司 | Transfer device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2717123C2 (en) | Furnace with cold crucible with heating by two electromagnetic inductors equipped with device which forms magnetic flux concentrator, use of furnace for melting of mixture of metal(s) and oxide(s) characteristic for corium | |
| US7388896B2 (en) | Induction melter apparatus | |
| EP2671430B1 (en) | High performance induction plasma torch | |
| CN111562282B (en) | Test device and method for simulating transient reaction of melt at high temperature | |
| CN104567401B (en) | Fused mass Medium frequency induction high-temperature heating equipment | |
| US10231290B2 (en) | Electromagnetic induction furnace and use of the furnace for melting a mixture of metal(s) and oxide(s), said mixture representing a corium | |
| CN212727469U (en) | Metal working medium bottom heating device | |
| CN211626073U (en) | Vacuum smelting furnace for granulating precious metals | |
| CN103717282A (en) | Process and device for bringing two immiscible liquids into contact, without mixing and at high temperature, with heating and brazing by induction | |
| Hong et al. | Application of cold crucible for melting of UO2/ZrO2 mixture | |
| US20130259181A1 (en) | Device for Generating a High Temperature Gradient in a Nuclear Fuel Sample | |
| Min et al. | COMSOL simulation for design of induction heating system in VULCAN facility | |
| RU2227336C2 (en) | Method and induction heating system for pyrochemical recovery of spent nuclear fuel | |
| CN107132242B (en) | High-temperature molten salt electrochemical in-situ Synchrotron Radiation Study device | |
| KR101517377B1 (en) | High temperature measurement instrument in molten material with long-term durability | |
| CN104517657A (en) | Device for generating a high temperature gradient in a sample, including optical control means | |
| Sugilal | Experimental study of natural convection in a glass pool inside a cold crucible induction melter | |
| CN209968446U (en) | Fixed point device based on temperature control high-precision salt bath thermostatic bath | |
| CN113012830B (en) | Be applied to melting tank wholeness capability test device | |
| Kessie et al. | Process vessel design for frozen-wall containment of fused salt | |
| Chudanov et al. | The analysis of the large scale RCW test | |
| Wang et al. | The Thermal and Structural Analysis of Vertical Stability Coil | |
| An et al. | Experimental investigation of the interaction kinetics between metallic melt and special concrete | |
| Hao et al. | Research and development of copper joint for ITER In-Vessel Coils | |
| Hanus et al. | Computational and Experimental Examination of Simulated Core Damage and Relocation Dynamics of a BWR Fuel Assembly—16013 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |