CN113461308A - Induction coil and glass solidification device for radioactive waste liquid - Google Patents
Induction coil and glass solidification device for radioactive waste liquid Download PDFInfo
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- CN113461308A CN113461308A CN202110684936.0A CN202110684936A CN113461308A CN 113461308 A CN113461308 A CN 113461308A CN 202110684936 A CN202110684936 A CN 202110684936A CN 113461308 A CN113461308 A CN 113461308A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/021—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by induction heating
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/09—Other methods of shaping glass by fusing powdered glass in a shaping mould
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
- G21F9/16—Processing by fixation in stable solid media
- G21F9/162—Processing by fixation in stable solid media in an inorganic matrix, e.g. clays, zeolites
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Manufacturing & Machinery (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
Abstract
An embodiment of the invention discloses an induction coil for providing an electromagnetic field for a cold crucible, comprising: the single-layer multi-turn coil is wound on the outer side of the cold crucible main body; and the turn pitch of each two adjacent turns of coils close to the bottom of the cold crucible is smaller than the turn pitch of each two adjacent turns of coils close to the top of the cold crucible. By adopting the induction coil provided by the embodiment of the invention, the magnetic field intensity of an electromagnetic field at the bottom area of the cold crucible can be enhanced, the phenomenon that the material at the position is too low in temperature and tends to solidify is prevented, and the molten material is favorably discharged from the bottom of the cold crucible.
Description
Technical Field
The invention relates to the technical field of radioactive waste liquid glass solidification, in particular to an induction coil and a device for carrying out glass solidification on radioactive waste liquid.
Background
Currently, China is in the period of high-speed development of nuclear energy, and in the nuclear industry, a large amount of radioactive waste is generated. Among them, radioactive waste liquid, especially high-level radioactive waste liquid, is especially important for the treatment and disposal of radioactive waste liquid because of its characteristics of high specific activity, complex components, strong acidity, strong corrosiveness, containing some nuclides with long half-life and high biotoxicity, etc. The radioactive waste liquid is properly treated, so that the influence of the radioactive waste liquid on the environment can be reduced to the minimum.
The cold crucible glass solidification technology is a novel glass solidification technology for radioactive waste treatment in the world at present. The cold crucible glass solidification technology is that high-frequency current is generated by a high-frequency power supply, and then the high-frequency current is converted into electromagnetic current through an induction coil to penetrate into a material to be treated to form eddy current to generate heat, so that the material to be treated is melted into glass. The inner wall of the furnace body of the crucible is filled with cooling water, and the melt in the crucible is solidified on the inner wall of the crucible to form a cold wall, so the crucible is called as a cold crucible. Since the high temperature melt is not in direct contact with the cold crucible walls, the crucible walls are not corroded. The cold crucible does not need refractory materials or electrode heating, the corrosion and pollution to the crucible are greatly reduced because the melt is contained in the cold wall, the cold crucible has long service life and simple retirement, the cold crucible glass solidification technology has high melting temperature, wider waste treatment types and high solidification speed, and therefore, the cold crucible glass solidification technology has unique advantages in treating radioactive waste.
When the radioactive waste liquid is subjected to glass solidification treatment using a cold crucible, a high-frequency electromagnetic field generated by an induction coil surrounding the outside of a cold crucible main body is generally used to inductively heat and melt a material such as radioactive waste in the cold crucible. The induction coil is one of the core components in the glass solidification process of radioactive waste liquid, and influences the distribution of an electromagnetic field in and around the cold crucible and the intensity of the electromagnetic field, and further influences the operation of the cold crucible, so that the induction coil needs to be reasonably designed to meet the normal operation of the cold crucible and the glass solidification requirements of materials such as radioactive waste and the like. At present, an induction coil of a cold crucible generally adopts a multi-turn close-wound coil, a multi-turn loose-wound coil or a single-turn coil which are uniformly arranged.
Disclosure of Invention
One aspect of the present invention provides an induction coil for providing an electromagnetic field to a cold crucible, comprising: the single-layer multi-turn coil is wound on the outer side of the cold crucible main body; and the turn pitch of each two adjacent turns of coils close to the bottom of the cold crucible is smaller than the turn pitch of each two adjacent turns of coils close to the top of the cold crucible.
In some embodiments, the turn pitch increases linearly from bottom to top along the axial direction of the cold crucible.
In some embodiments, the turn pitch increases stepwise from bottom to top in the axial direction of the cold crucible.
In some embodiments, the induction coil is divided into a plurality of regions from bottom to top along an axial direction of the cold crucible; the stepwise increasing comprises: the turn-to-turn distances of every two adjacent turns of coils in each area are equal; the turn-to-turn distance between every two adjacent turns of the coils in each area is smaller than the turn-to-turn distance between every two adjacent turns of the coils in the other area on each area.
In some embodiments, the induction coil is divided into a plurality of regions from bottom to top along an axial direction of the cold crucible; the turn-to-turn distance of each two adjacent turns of coils in each region is linearly increased; the increment of the turn distance of each two adjacent turns of coils in each area is smaller than the increment of the turn distance of each two adjacent turns of coils in the other area on each area.
In some embodiments, the induction coil is divided into a plurality of regions from bottom to top along an axial direction of the cold crucible; the turn-to-turn distance of each two adjacent turns of coils in each region is linearly increased; the turn-to-turn distance of each adjacent two-turn coil in each region is increased by an amount greater than the turn-to-turn distance of each adjacent two-turn coil in another region located above each region.
In some embodiments, the distance between the induction coil and the bottom of the cold crucible is a predetermined distance.
In some embodiments, the total height of the induction coil is a predetermined height.
In some embodiments, the predetermined height is determined based on a height of the cold crucible body.
In some embodiments, the shape of the cross-section of each turn of the coil comprises a rectangle, a circle, or an ellipse.
In some embodiments, a dimension of a cross section of each turn of coil along an axial direction of the cold crucible is a first predetermined value.
In some embodiments, a dimension of a cross section of each turn of coil in a radial direction of the cold crucible is a second predetermined value.
In some embodiments, a surface of the coil is provided with an insulating layer.
In some embodiments, a plurality of the coils are connected in series or in parallel.
Another aspect of the present invention provides an apparatus for vitrification of radioactive liquid waste, comprising: a cold crucible including a cold crucible body for containing the radioactive liquid waste to glass-solidify the radioactive liquid waste; the induction coil is wound on the outer side of the cold crucible main body; wherein the induction coil comprises the induction coil according to any one of the above embodiments.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic structural view of an induction coil wound outside a cold crucible main body according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the induction coil shown in FIG. 1 from another perspective;
FIG. 3 is a schematic structural view of an induction coil wound outside a cold crucible main body according to a second embodiment of the present invention;
FIG. 4 is a schematic structural view of an induction coil wound outside a cold crucible main body according to a third embodiment of the present invention;
FIG. 5 is a schematic structural view of an induction coil wound outside a cold crucible main body according to a fourth embodiment of the present invention;
FIG. 6 is a schematic structural view of an induction coil wound outside a cold crucible main body according to a fifth embodiment of the present invention;
fig. 7 is an enlarged view at a in fig. 6;
fig. 8 is a schematic structural diagram of an induction coil according to an embodiment of the present invention, in which a plurality of turns are arranged in parallel.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Description of reference numerals:
100. an induction coil; 200. cooling the crucible; 210. a cold crucible main body; 220. cooling the top of the crucible pot; 230. cooling the bottom of the crucible; 300. an insulating layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.
One aspect of the present invention provides an induction coil wound around an outer side of a cold crucible body for providing an electromagnetic field to the cold crucible so that a material in the cold crucible is inductively heated and melted by the electromagnetic field. As shown in fig. 1 and 2, an induction coil 100 according to an embodiment of the present invention includes a single-layer multi-turn coil wound on an outer side of a cold crucible main body 210, adjacent two turns of the multi-turn coil have a turn pitch d therebetween, and the turn pitch of each adjacent two turns of the multi-turn coil near a bottom of the cold crucible is smaller than the turn pitch of each adjacent two turns of the multi-turn coil near a top of the cold crucible.
The induction coil in this embodiment is wound around the outside of the cold crucible main body in a non-uniform arrangement, and each turn of coil near the bottom of the cold crucible is wound tightly, and each turn of coil near the top of the cold crucible is wound loosely relative to each turn of coil near the bottom of the cold crucible. The induction coil can be in the inside electromagnetic field that produces of cold crucible, and the mode through above-mentioned inhomogeneous setting sets up induction coil, can strengthen the magnetic field intensity that is located the regional department electromagnetic field in cold crucible bottom, is favorable to being located the heating and the melting of the material of cold crucible bottom, prevents that the material temperature of this region department from crossing lowly and tending to the solidification, is favorable to unloading out of the cold crucible bottom of fused material.
As shown in fig. 2, in the present embodiment, a distance h between the induction coil 100 and the bottom of the cold crucible is a predetermined distance. The distance between the induction coil 100 and the bottom of the cold crucible influences the distribution of the electromagnetic field inside the cold crucible, and when the cold crucible is used for treating radioactive waste liquid, the glass raw material needs to be heated and melted by the heating material to start the smelting of the radioactive waste liquid to be treated, and during the starting process, the distance h influences the glass melting effect. Therefore, setting the distance h to a predetermined distance facilitates induction heating and melting of the material in the cold crucible. Specifically, the distance h may be specifically set according to conditions such as a specific size of the cold crucible 200, a processing capacity of the material, a heating material used, and a height of the induction coil.
In the present embodiment, the total height H of the induction coil 100 is a predetermined height. Further, the predetermined height may be determined according to the height of the cold crucible body 210. When the cold crucible 200 is used for glass solidification of radioactive waste liquid, the electromagnetic field acts on the glass melt to enable the effective area of the glass melt subjected to induction heating to be within the height range covered by the induction coil 100, the induction coil 100 is set to be at the preset height, the height H of the induction coil is adapted to the height of the cold crucible main body 210, and heating and melting of materials in the process of glass solidification in the cold crucible are facilitated. For example, the predetermined height may be proportional to the height of the cold crucible body.
As shown in fig. 2 and 3, in the present embodiment, the cross-section of the induction coil 100 may have a rectangular shape, a circular shape, an oval shape, a square shape, or other shapes. The cross-sectional shape of the induction coil 100 also affects the distribution of the electromagnetic field in the cold crucible, and the particular cross-sectional shape of the induction coil can be selected based on the desired electromagnetic field.
The size of the cross section of each turn coil may be specifically selected according to conditions such as the actual size of the cold crucible. In the present embodiment, the dimension of the cross section of each coil turn along the axial direction of the cold crucible 200 is a first predetermined value, and the dimension of the cross section of each coil turn along the radial direction of the cold crucible 200 is a second predetermined value, so that the electromagnetic field generated by the induction coil 100 can meet the working requirement. For example, when the sectional shape of the induction coil 100 is a rectangle, the width of the induction coil (i.e., the dimension in the radial direction of the cold crucible 200) may be set to 2 cm, the wall thickness may be set to 0.5 cm, and the height of each turn of the coil may be set according to the total height H of the induction coil 100, the turn pitch d, and the number of turns of the induction coil 100. The size of the induction coil 100 is not limited in this embodiment, and the above specific size parameters are only for the purpose of describing this embodiment.
Further, as shown in fig. 7, the surface of the induction coil 100 is also provided with an insulating layer 300. Insulating layer 300 may be coated or wrapped on the surface of induction coil 100 to prevent breakdown between adjacent turns of the coil. Preferably, the insulating layer 300 can also resist high temperature, for example, the insulating layer 300 can be made of silicone insulating paint, glass fiber or ceramic.
By adopting the induction coil 100 of the embodiment, the turn pitch of the induction coil 100 is set to be loose at the upper part and tight at the lower part, so that the magnetic field intensity of the electromagnetic field at the bottom area of the cold crucible can be enhanced, and the molten material can be discharged from the bottom of the cold crucible.
It should be noted that, the multi-turn coils in this embodiment may be connected in series or in parallel. As shown in fig. 1, the multi-turn coil is connected in series and wound around the outside of the cold crucible main body 210. As shown in fig. 8, the multi-turn coils may be arranged in parallel. For example, the two ends of the multi-turn coil are respectively connected to the same conductor in parallel, and then the two conductors are connected to a power supply, which can supply power to the induction coil 100.
Fig. 3 is a schematic structural view illustrating the induction coil 100 according to the second embodiment of the present invention wound around the outside of the cold crucible body 210. As shown in fig. 3, in the induction coil 100, the turn-to-turn distance d between two adjacent turns increases linearly from bottom to top along the axial direction of the cold crucible 200. For example, the turn pitch d of the induction coil 100 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm in sequence from bottom to top in the axial direction of the cold crucible 200. The specific arrangement of the inter-turn distance is not limited in this embodiment, and in other embodiments, other inter-turn distances that increase linearly may also be adopted.
In addition, other structural arrangements and working principles in this embodiment are the same as those in the first embodiment, and are not described herein again.
Fig. 4 is a schematic structural view illustrating the induction coil 100 according to the third embodiment of the present invention wound around the outside of the cold crucible main body 210. As shown in fig. 4, in the induction coil 100, the turn-to-turn distance d between two adjacent turns increases stepwise from bottom to top along the axial direction of the cold crucible 200.
Optionally, the induction coil 100 is divided into a plurality of regions from bottom to top along the axial direction of the cold crucible 200; and in each region, the turn-to-turn distance between every two adjacent turns of coils is equal, and the turn-to-turn distance between every two adjacent turns of coils in each region is smaller than the turn-to-turn distance between every two adjacent turns of coils in the other region on each region.
As shown in fig. 4, in the present embodiment, the induction coil 100 may be divided into two regions from bottom to top along the axial direction of the cold crucible 200, in a first region near the bottom 230 of the cold crucible, a turn-to-turn distance d between two adjacent turns is a first turn-to-turn distance, in a second region above and adjacent to the first region, the turn-to-turn distance d is a second turn-to-turn distance, and the second turn-to-turn distance is greater than the first turn-to-turn distance. For example, the pitch between four turns of wire near the bottom 230 of the cold crucible may be 3 mm, while the pitch between four turns of wire near the top 220 of the cold crucible may be 5 mm. Of course, the number of turns of the induction coil 100, the number of areas into which the induction coil 100 is divided, and the specific turn pitch are not limited in this embodiment, and in other embodiments, the arrangement may be performed in other manners.
In addition, other structural arrangements and working principles in this embodiment are the same as those in the first embodiment, and are not described herein again.
It should be noted that the manner in which the pitch of the turns of the induction coil 100 is increased stepwise from bottom to top along the axial direction of the cold crucible 200 is not limited to the manner in the third embodiment. Optionally, the induction coil 100 is divided into a plurality of regions from bottom to top along the axial direction of the cold crucible 200; in each region, the turn-to-turn distance of each two adjacent turns of the coil is linearly increased. And the increment of the turn pitch of each two adjacent turns of coils in each region is smaller than that of the two adjacent turns of coils in the other region on each region, or the increment of the turn pitch of each two adjacent turns of coils in each region is larger than that of the two adjacent turns of coils in the other region on each region.
As shown in fig. 5, in the fourth embodiment, the induction coil 100 may be divided into two regions from the bottom to the top in the axial direction of the cold crucible 200. In a first region near the cold crucible bottom 230, the pitch increases linearly and by a first predetermined amount, and in a second region above the first region, the pitch increases linearly and by a second predetermined amount that is less than the first predetermined amount. For example, the turn pitch d is 1, 3, 5, 6, 7, 8 mm in order from bottom to top in the axial direction of the cold crucible 200, wherein the first predetermined amount is 2 mm and the second predetermined amount is 1 mm. Of course, the number of turns of the induction coil 100, the number of areas into which the induction coil 100 is divided, and the specific turn pitch are not limited in this embodiment, and in other embodiments, the arrangement may be performed in other manners.
In addition, other structural arrangements and working principles in this embodiment are the same as those in the first embodiment, and are not described herein again.
Fig. 6 is a schematic structural view illustrating a fifth embodiment of the present invention in which an induction coil is wound around the outside of a cold crucible main body 210. The induction coil 100 is divided into a plurality of regions from bottom to top along the axial direction of the cold crucible 200, and the turn-to-turn distances between two adjacent turns of coils in each region are set in different manners. Specifically, in one region, the turn-to-turn distance of each adjacent two-turn coil may be equal, and in another region above the region, the turn-to-turn distance of each adjacent two-turn coil may increase linearly; alternatively, in one region, the pitch of each adjacent two-turn coil may increase linearly, and in another region above the region, the pitch of each adjacent two-turn coil may be equal. For example, the turn pitch d is 2, 3, 4, 5, 6 mm in order from bottom to top in the axial direction of the cold crucible 200, wherein in a first region the turn pitch is 2 mm each and in a second region the turn pitch increases linearly in increments of 1 mm. Of course, the number of turns of the induction coil 100, the number of areas into which the induction coil 100 is divided, and the specific turn pitch are not limited in this embodiment, and in other embodiments, the arrangement may be performed in other manners.
In addition, other structural arrangements and working principles in this embodiment are the same as those in the first embodiment, and are not described herein again.
Another aspect of the present invention provides an apparatus for glass-solidifying radioactive liquid waste, as shown in fig. 1 to 6, comprising a cold crucible 200 and an induction coil 100, wherein the cold crucible comprises a cold crucible body 210 for containing glass and the radioactive liquid waste to glass-solidify the radioactive liquid waste, the induction coil 100 is wound outside the cold crucible body 210, and the induction coil 100 comprises the induction coil as described in any one of the above embodiments for generating an electromagnetic field inside the cold crucible 200 to inductively heat and melt the glass inside the cold crucible 200. Of course, the apparatus in this example is not limited to use for vitrification of radioactive liquid waste, but in other embodiments, not shown, it may also be used for vitrification of other liquid waste or for melting of other materials.
The device for performing glass curing on radioactive waste liquid provided by the embodiment of the invention has all the beneficial effects by arranging the induction coil in any one of the technical schemes, and the detailed description is omitted.
In the description herein, reference to the term "one embodiment," "some embodiments," "a specific embodiment," or the like, means 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 embodiments of the disclosure. 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. For the embodiments of the present invention, the embodiments of the present invention and features of the embodiments may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (15)
1. An induction coil for providing an electromagnetic field to a cold crucible,
the induction coil (100) comprises: a single-layer multi-turn coil wound on the outer side of the cold crucible main body (210);
and the turn pitch of each two adjacent turns of coils close to the bottom of the cold crucible is smaller than the turn pitch of each two adjacent turns of coils close to the top of the cold crucible.
2. The induction coil as set forth in claim 1, wherein said turn pitch increases linearly from bottom to top in an axial direction of said cold crucible.
3. The induction coil of claim 1, wherein said turn pitch increases stepwise from bottom to top in an axial direction of said cold crucible.
4. The induction coil as set forth in claim 3, characterized in that the induction coil (100) is divided into a plurality of regions from bottom to top in the axial direction of the cold crucible;
the stepwise increasing comprises:
the turn-to-turn distances of every two adjacent turns of coils in each area are equal;
the turn-to-turn distance between every two adjacent turns of the coils in each area is smaller than the turn-to-turn distance between every two adjacent turns of the coils in the other area on each area.
5. The induction coil as set forth in claim 1, characterized in that the induction coil (100) is divided into a plurality of regions from bottom to top in the axial direction of the cold crucible;
the turn-to-turn distance of each two adjacent turns of coils in each region is linearly increased;
the increment of the turn distance of each two adjacent turns of coils in each area is smaller than the increment of the turn distance of each two adjacent turns of coils in the other area on each area.
6. The induction coil as set forth in claim 1, characterized in that the induction coil (100) is divided into a plurality of regions from bottom to top in the axial direction of the cold crucible;
the turn-to-turn distance of each two adjacent turns of coils in each region is linearly increased;
the turn-to-turn distance of each adjacent two-turn coil in each region is increased by an amount greater than the turn-to-turn distance of each adjacent two-turn coil in another region located above each region.
7. The induction coil according to any of claims 1 to 6, characterized in that the distance between the induction coil (100) and the bottom of the cold crucible is a predetermined distance.
8. The induction coil according to any of claims 1 to 7, characterized in that the total height of the induction coil (100) is a predetermined height.
9. The induction coil as set forth in claim 8, wherein the predetermined height is determined based on a height of the cold crucible body (210).
10. The induction coil as claimed in any one of claims 1 to 9, wherein the shape of the cross section of each turn of coil comprises a rectangle, a circle or an ellipse.
11. The induction coil as claimed in any one of claims 1 to 10, wherein a dimension of a cross section of each turn of the coil in an axial direction of said cold crucible is a first predetermined value.
12. The induction coil as set forth in claim 11, wherein a dimension of a cross section of each turn of the coil in a radial direction of the cold crucible is a second predetermined value.
13. An induction coil according to any of claims 1-12, characterized in that the surface of the coil is provided with an insulating layer (300).
14. The induction coil of claim 1, wherein a plurality of turns of said coil are connected in series or in parallel.
15. An apparatus for vitrification of radioactive liquid waste, comprising:
a cold crucible (200) comprising a cold crucible body (210) for containing the radioactive spent liquid for glass-curing the radioactive spent liquid;
the induction coil (100), the induction coil (100) is wound on the outer side of the cold crucible main body (210);
wherein the induction coil (100) comprises an induction coil according to any of claims 1-14.
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