Molten glass heating device

Abstract

The present invention provides a heating device for molten glass, comprising a platinum channel and a flange sleeved on the outer wall surface of the platinum channel and in electrical contact with the platinum channel, the flange comprising an inner ring and an outer ring circumferentially connected to the inner ring, and by setting the radial thickness of the first arc of the platinum channel to be smaller than the radial thickness of the second arc, and the axial thickness of the first arc segment of the inner ring to be smaller than the axial thickness of the second arc segment, and the outer ring being eccentrically arranged upward relative to the platinum channel in the vertical direction, more current passes through the bottom of the platinum channel to generate more heat, and after the glass liquid at the bottom of the platinum channel is strongly heated, an upward glass liquid flow is generated, and after the glass liquid flow reaches the top of the platinum channel, it flows leftward, downward, rightward, and downward, respectively, thereby realizing the function of "static stirring", and the uniformity of the temperature and composition of the glass liquid is improved, so that the glass liquid achieves the effect of homogenization and uniform heating.

Description

Technical Field

[0001] The invention relates to the field of glass manufacturing, and in particular to a heating device for molten glass. Background Art

[0002] Compared with ordinary soda-lime-silica glass, the mechanical properties, thermal stability, water resistance, alkali resistance, and acid resistance of borosilicate glass are greatly improved. Therefore, it is widely used in aerospace, military, chemical, medicine, fire protection, home appliances and other industries, and has good application value and social benefits.

[0003] Among them, during the production process of neutral medicinal borosilicate glass, the molten glass is transferred to the molding device through a platinum channel containing various process sections. In order to ensure that the molten glass runs under the temperature curve required by the process, each section of the platinum channel can be directly or indirectly heated by applying current in these sections, thereby heating the molten glass therein. The process sections of the platinum channel include but are not limited to the clarification section, stirring section and cooling section.

[0004] However, due to the influence of gravity, the glass liquid in the platinum channel has non-uniform composition in the vertical direction. At the same time, in the existing molten glass heating device, the current is more likely to flow through the upper wall of the platinum channel, and the current flowing through the upper wall of the platinum channel is greater than the current flowing through the lower wall of the platinum channel. Under the same other conditions, the heat generated by the upper wall of the platinum channel is greater than the heat generated by the lower wall of the platinum channel. This causes the glass liquid to be heated unevenly in the vertical direction, which further leads to the non-uniform composition of the glass liquid in the vertical direction. Summary of the invention

[0005] The main purpose of the present invention is to provide a heating device for molten glass, aiming to make the glass liquid in the platinum channel reach a uniform temperature and uniform quality.

[0006] To achieve the above object, the present invention provides a heating device for molten glass, having a symmetry line along a vertical direction, comprising:

[0007] A platinum channel, the wall thickness of which changes in the circumferential direction; the radial cross section of the platinum channel comprises a first circular arc located at the top and a second circular arc located at the bottom, the first circular arc and the second circular arc enclose a radial cross section of the platinum channel, the radial thickness of the second circular arc is greater than the radial thickness of the first circular arc, and the first circular arc and the second circular arc are symmetrically arranged along the symmetry line;

[0008] A flange is sleeved on the outer wall surface of the platinum channel and is in electrical contact with the platinum channel, the flange includes an inner ring and an outer ring circumferentially connected to the inner ring; the inner ring includes a first arc segment located at the top and a second arc segment located at the bottom, the first arc segment and the second arc segment enclose the inner ring, and the first arc segment and the second arc segment are symmetrically arranged along the symmetry line; the axial thickness of the first arc segment is less than the axial thickness of the second arc segment; the inner ring is concentrically arranged with the platinum channel, and the outer ring is eccentrically arranged upward relative to the platinum channel in the vertical direction.

[0009] Optionally, the radial cross-sectional area of ​​the second circular arc is 30% to 60% of the radial cross-sectional area of ​​the platinum channel.

[0010] Optionally, the axial thickness of the second arc segment is 1.2 to 3 times the axial thickness of the first arc segment.

[0011] Optionally, the upward offset of the center of the outer ring relative to the center of the platinum channel is 10% to 60% of the diameter of the platinum channel.

[0012] Optionally, a choke hole is opened on the outer ring, and the choke holes are symmetrically arranged along the symmetry line, and the choke hole is located above the inner ring.

[0013] Optionally, the shape of the choke hole in the radial cross section is a long strip, a crescent or a dovetail.

[0014] Optionally, the heating device for molten glass further comprises a cooling tube, wherein the cooling tube is arranged around the outer ring, and a cooling medium flows through the cooling tube.

[0015] Optionally, the heating device for molten glass further comprises a plurality of reinforcing members, and the plurality of reinforcing members are arranged on the inner wall surface of the top of the platinum channel at intervals along the length direction of the platinum channel.

[0016] Optionally, the shape of the radial cross section of the platinum channel is circular, rectangular, triangular, trapezoidal, parallelogram, elliptical or racetrack.

[0017] Optionally, the material of the inner ring is platinum-based precious metal or platinum-based precious metal alloy; the material of the outer ring is nickel with a purity of at least 99wt%.

[0018] Through special design, the present invention allows more current to pass through the bottom of the platinum channel, thereby generating more heat. After the glass liquid at the bottom of the platinum channel is strongly heated, an upward glass liquid flow is generated. After the glass liquid flows to the top of the platinum channel, it flows to the left and downward and to the right and downward, respectively, thereby realizing the function of "static stirring". The uniformity of the temperature and composition of the glass liquid is improved, thereby achieving the effect of homogenizing and isolating the heat of the glass liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present invention, the drawings required for use in the embodiments or exemplary descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a front view schematic diagram of a heating device for molten glass when the radial cross section of the platinum channel of an embodiment of the present invention is circular;

[0021] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along the axial direction;

[0022] Figures 3 to 5 Schematic diagrams of three implementations of the second arc when the radial cross section of the platinum channel of the present invention is circular;

[0023] Figure 6 It is a front view schematic diagram of a heating device for molten glass when the radial cross section of the platinum channel of an embodiment of the present invention is in the shape of a racetrack;

[0024] Figures 7 to 9 Schematic diagrams of three implementations of the second arc when the radial cross section of the platinum channel of the present invention is in the shape of a racetrack;

[0025] Fig.10 This is a schematic diagram of the installation of the platinum channel reinforcement rib according to an embodiment of the present invention;

[0026] Fig.11 The figure is a schematic diagram of the connection between two adjacent electric heating flanges and a power supply according to an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 10 Platinum Channel 211 First arc 11 First arc 212 The second arc 12 The second arc 22 Outer Ring 121 First wall portion 23 Choke 122 Second wall portion 24 electrode 123 Third wall portion 30 Cooling pipe 20 Flange 40 Reinforcement 21 Inner Ring 50 Power supply

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] As used herein, the term "radial cross section" refers to a cross section formed when a platinum channel is cut by a plane perpendicular to the longitudinal axis of the platinum channel, unless otherwise specified.

[0034] The invention provides a heating device for molten glass.

[0035] In one embodiment, if Figures 1 to 5 As shown, the heating device for molten glass includes a platinum channel 10 and a flange 20, wherein the heating device has a symmetry line Y along the vertical direction, the wall thickness of the platinum channel 10 changes in the circumferential direction, and the flange 20 is sleeved on the outer wall surface of the platinum channel 10 and is in electrical contact with the platinum channel 10. Alternating current is connected to the flange 20, and the flange 20 conducts the current to the platinum channel 10, and the platinum channel 10 is used as an electric heating load for electrical heating. The flange 20 includes an inner ring 21 and an outer ring 22 connected to the inner ring 21, and the inner ring 21 is in electrical contact with the outer wall surface of the platinum channel 10. The outer ring 22 plays a role in distributing the current, and the inner ring 21 plays a role in introducing the current into the platinum channel 10.

[0036] The radial cross section of the platinum channel 10 includes a first arc 11 located at the top and a second arc 12 located at the bottom, the first arc 11 and the second arc 12 together form the radial cross section of the platinum channel 10, the radial thickness of the second arc 12 is greater than the radial thickness of the first arc 11, and the first arc 11 and the second arc 12 are symmetrically arranged along the symmetry line Y; the inner ring 21 includes a first arc segment 211 located at the top and a second arc segment 212 located at the bottom, the first arc segment 211 and the second arc segment 212 together form the inner ring 21, and the first arc segment 211 and the second arc segment 212 are symmetrically arranged along the symmetry line Y; the axial thickness of the first arc segment 211 is less than the axial thickness of the second arc segment 212; the inner ring 21 is concentrically arranged with the platinum channel 10, and the outer ring 22 is eccentrically arranged upward relative to the inner ring 21 in the vertical direction.

[0037] According to the calculation formula of conductor resistance:

[0038] R = ρ × L / S;

[0039] Where ρ is the resistivity of the conductor, L is the length of the conductor, and S is the cross-sectional area of ​​the conductor.

[0040] The radial thickness of the second arc 12 is greater than the radial thickness of the first arc 11, that is, the conductive cross-sectional area of ​​the second arc 12 is larger than the conductive cross-sectional area of ​​the first arc 11. According to the calculation formula of the conductor resistance, under the same other conditions, the resistance of the second arc 12 is smaller than that of the first arc 11, that is, the thicker second arc 12 has a smaller resistance than the first arc 11. Since the first arc 11 and the second arc 12 are arranged in parallel, if a certain voltage is applied, according to Ohm's law, under the premise of a certain voltage, the smaller the resistance, the greater the current, therefore, the current flowing through the second arc 12 is greater than the current flowing through the first arc 11. According to W=UI, under the condition of a certain voltage, the electric heating power generated by the second arc 12 is greater than the electric heating power generated by the first arc 11, that is, the electric heating power at the bottom of the platinum channel 10 is greater than the electric heating power at the top of the platinum channel 10.

[0041] Similarly, the axial thickness W1 of the first arc segment 211 is smaller than the axial thickness W2 of the second arc segment 212, that is, the conductive cross-sectional area of ​​the first arc segment 211 is smaller than the conductive cross-sectional area of ​​the second arc segment 212. According to the calculation formula of the conductor resistance, under the same other conditions, the resistance of the first arc segment 211 is greater than the resistance of the second arc segment 212. Since the first arc segment 211 and the second arc segment 212 are arranged in parallel, if a certain voltage is applied, according to Ohm's law, under the premise of a certain voltage, the smaller the resistance, the greater the current. Therefore, the current flowing through the second arc segment 212 is greater than the current flowing through the first arc segment 211, and the second arc segment 212 is in electrical contact with the second arc 12. The second arc segment 212 introduces a larger current into the second arc 12, further increasing the electric heating power at the bottom of the platinum channel 10.

[0042] Since the outer ring 22 is eccentrically arranged upward relative to the platinum channel 10 in the vertical direction. The radial width H1 of the upper part of the outer ring 22 is greater than the radial width H2 of the lower part of the outer ring 22. The upper part of the outer ring 22 has the same resistivity ρ and conductive cross-sectional area S as the lower part of the outer ring 22. According to the conductor resistance calculation formula, since the radial width H1 of the upper part of the outer ring 22 is greater than the radial width H2 of the lower part of the outer ring 22, the length L of the conductor passing through the upper part of the outer ring 22 is larger, and thus the upper part of the outer ring 22 has a larger resistance R. According to Ohm's theorem, the upper part of the outer ring 22 has a larger resistance R. Under the same voltage U, a smaller current is passed into the top of the platinum channel 10, and a larger current is passed into the bottom of the platinum channel 10, further increasing the electric heating power at the bottom of the platinum channel 10.

[0043] The present invention is specially designed so that more current passes through the bottom of the platinum channel 10 to generate more heat. After the glass liquid at the bottom of the platinum channel 10 is strongly heated, an upward glass liquid flow is generated. After the glass liquid flows to the top of the platinum channel 10, they flow leftward and downward and rightward and downward (such as Figure 5 As shown, where the arrow in the figure indicates the flow direction of the glass liquid), the function of "static stirring" is realized, the uniformity of the temperature and composition of the glass liquid is improved, so that the glass liquid can achieve a homogeneous and uniform heating effect.

[0044] At the same time, the present invention greatly improves the uniformity of the temperature and composition of the glass liquid flowing through the platinum channel 10 while ensuring the life of the platinum channel 10. For the platinum channel 10 of the clarification section, the present invention effectively increases the temperature of the glass liquid near the bottom center of the clarification section, and accelerates the speed of the gaseous substances contained in the glass liquid floating up and being discharged from the glass liquid, greatly improving the clarification effect of the clarification section on the glass liquid. The temperature difference between the temperature of the glass liquid at the outlet center of the platinum channel 10 and the temperature of the glass liquid at the outlet liquid surface of the platinum channel 10 is less than or equal to 5°C.

[0045] The so-called "static stirring" refers to the movement of the fluid inside the platinum channel 10 without the action of moving parts. Different from the traditional stirring relying on moving parts, the reason for the "static stirring" is that there are uneven temperatures and uneven qualities in the fluid, which causes differences in the density of the fluid, and the fluids of different densities produce convection when heated.

[0046] In one embodiment of the present invention, the radial cross-sectional area of ​​the second circular arc 12 is 30% to 60% of the radial cross-sectional area of ​​the platinum channel 10, so that sufficient heat is provided at the second circular arc 12. When the radial cross-sectional area of ​​the second circular arc 12 accounts for too small a proportion, the second circular arc 12 is not obviously thickened, and the current increase of the second circular arc 12 is not obvious; when the radial cross-sectional area of ​​the second circular arc 12 accounts for too large a proportion, for example, exceeding 60% of the radial cross-sectional area of ​​the platinum channel 10, the cost will be increased.

[0047] There is no limitation on the specific form of the second circular arc 12 , as long as the radial thickness of the second circular arc 12 is greater than the radial thickness of the first circular arc 11 , and the second circular arc 12 is symmetrically arranged along the symmetry line.

[0048] Specifically, in one embodiment of the present invention, the second arc 12 can be uniformly thickened, such as Figure 3 and 4 As shown in FIG. 7 , the manufacturing process of uniform thickening is simple. In other embodiments, the second arc may be unevenly thickened. Figure 5 and 8 As shown, the second arc 12 includes a continuous first wall portion 121 and a second wall portion 122, the first wall portion 121 is located at the center of the second arc 12, the second wall portion 122 includes two, the two second wall portions 122 are respectively located on both sides of the first wall portion 121, and the radial thickness of the first wall portion 121 is greater than the radial thickness of the second wall portion 122, and the radial thickness of the second wall portion 122 is greater than the radial thickness of the first arc 11.

[0049] As an optional embodiment, Fig. 9 As shown, the second arc 12 further includes a third wall portion 123, which is disposed between the first wall portion 121 and the second wall portion 122, and the radial thickness of the third wall portion 123 is less than the radial thickness of the first wall portion 121, and the radial thickness of the third wall portion 123 is greater than the radial thickness of the second wall portion 122. That is, the third wall portion 123 is a transition section between the first wall portion 121 and the second wall portion 122, and its radial thickness is between the radial thickness of the first wall portion 121 and the radial thickness of the second wall portion 122, so as to avoid directly reducing from the thicker first wall portion 121 to the thinner second wall portion 122, and to prevent the temperature of the second arc 12 from dropping sharply to both sides.

[0050] In one embodiment of the present invention, Figure 1-5As shown, the shape of the radial cross section of the platinum channel is circular; in another embodiment of the present invention, the shape of the radial cross section of the platinum channel is a racetrack shape, such as Figure 6-9 As shown, the racetrack shape is formed by splicing two parallel straight lines and two semicircles. The circular and racetrack shapes are convenient for the flow of glass liquid because their side walls are continuous arcs. In other embodiments, the radial cross-sectional shape of the platinum channel can also be other shapes, such as: rectangle, triangle, trapezoid, parallelogram or ellipse, etc., which are not limited here.

[0051] Optionally, the inner ring 21 is made of platinum-based precious metals (such as pure platinum) or platinum-based precious metal alloys (such as 10wt% platinum-rhodium or 20wt% platinum-rhodium); the outer ring 22 is nickel with a purity of at least 99wt%. Of course, in other embodiments, the inner ring 21 and the outer ring 22 can also be made of other materials, which are not limited here.

[0052] In one embodiment of the present invention, Figure 2 As shown, the axial thickness W2 of the second arc segment 212 is 1.2 to 3 times the axial thickness W1 of the first arc segment 211, so that the second arc segment 212 can divide a sufficiently large current and then introduce it into the second arc 12, that is, the bottom of the platinum channel 10. If the axial thickness W2 of the second arc segment 212 is less than 1.2 times the axial thickness W1 of the first arc segment 211, the bottom of the platinum channel 10 (that is, the second arc 12) may not be heated significantly; if the axial thickness W2 of the second arc segment 212 is greater than 3 times the axial thickness W1 of the first arc segment 211, the bottom of the platinum channel 10 (that is, the second arc 12) may be overheated, and the manufacturing cost will also increase.

[0053] In one embodiment of the present invention, Figure 1 and 6 As shown, the upward offset of the center of the outer ring 22 relative to the center of the platinum channel 10 is 10% to 60% of the diameter of the platinum channel 10, so that more current can be obtained below the outer ring 22. When the upward offset of the center of the outer ring 22 relative to the center of the platinum channel 10 exceeds 60% of the diameter of the platinum channel 10, the bottom of the platinum channel 10 (i.e., the second arc 12) may be overheated, while when the upward offset of the center of the outer ring 22 relative to the center of the platinum channel 10 is less than 10% of the diameter of the platinum channel 10, the bottom of the platinum channel 10 (i.e., the second arc 12) may not be heated significantly.

[0054] In one embodiment of the present invention, Figure 1 and 6As shown, the outer ring 22 is provided with a choke hole 23, and the choke hole 23 is symmetrically arranged along the symmetry line Y, and the choke hole 23 is located above the inner ring 21. The choke hole 23 arranged above the outer ring 22 is used to block the current directly transmitted to the first arc segment 211 along the center position above the outer ring 22. That is, in this embodiment, by providing the choke hole 23, the alternating current transmitted from the top of the outer ring 22 to the first arc segment 211 is bypassed, that is, the current flow path is increased, so as to indirectly increase the length of the conductor, that is, according to the conductor resistance calculation formula (described above), the conductor resistance R above the outer ring 22 bypassing from the left and right sides of the choke hole 23 has a greater length of the current-carrying conductor than when the choke hole 23 is not installed, so that the resistance value above the outer ring 22 is increased. According to Ohm's law, the resistance of the upper part of the outer ring 22 is greater than the resistance of the lower part of the outer ring 22, so that the current distributed by the second arc segment 212 is greater than the current distributed by the first arc segment 211, and more current is passed into the second arc 12 by the second arc segment 212, so that the second arc 12 obtains more electric heating power, thereby increasing the temperature of the second arc 12.

[0055] Optionally, the shape of the choke hole 23 in the radial cross section is a strip, a crescent or a dovetail shape. Of course, in other embodiments, the choke hole 23 can also be set to other shapes, which are not limited here.

[0056] Further, continue to refer to Figure 1 and 6 As shown, the flange 20 further includes an electrode 24 in electrical contact with the flange 20 and serves to connect the flange 20 to a power source through a cable, a bus bar or other electrical conductors.

[0057] Furthermore, if Figure 1 and 2 As shown, the heating device for molten glass further includes a cooling pipe 30, which is arranged around the outer side of the outer ring 22 to cool the flange 20 to prevent the flange 20 from being damaged due to a high temperature of the flange 20. Cooling water or compressed air is passed through the cooling pipe 30. Alternatively, other cooling substances are passed through the cooling pipe 30, which is not limited here.

[0058] Optionally, the cooling tube 30 is made of copper or nickel. Alternatively, the cooling tube 30 may also be made of other materials, which are not limited here.

[0059] Furthermore, if Fig.10As shown, the heating device for molten glass further comprises a plurality of reinforcing members 40, which are arranged at intervals on the inner wall surface of the top of the platinum channel 10 along the length direction of the platinum channel 10 to prevent the tube wall of the platinum channel 10 from collapsing.

[0060] Optionally, the reinforcement member 40 is a reinforcement rib, the width of the reinforcement rib is 5 mm to 20 mm, the thickness of the reinforcement rib is 0.5 mm to 1.5 mm, and the spacing between the reinforcement ribs is 200 mm to 500 mm.

[0061] Specifically, Fig.11 As shown, the flange 20 includes a plurality of flanges, and the heating device for molten glass also includes a power supply 50, the two ends of which are respectively connected to the current access lead-out terminals 24 of two adjacent flanges 20, so as to heat the platinum channel 10 (such as a container of a clarification section) between the two adjacent flanges 20. That is, the power supply 50, the two adjacent flanges 20, and the platinum channel 10 form a heating loop.

[0062] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent transformations made using the contents of the present invention's specification and drawings, or direct / indirect applications in other related technical fields, under the concept of the present invention, are included in the patent protection scope of the present invention.

Claims

1. A heating device for molten glass, having a symmetry line along the vertical direction, characterized in that: include: A platinum channel, the wall thickness of which changes in the circumferential direction; the radial cross section of the platinum channel comprises a first circular arc located at the top and a second circular arc located at the bottom, the first circular arc and the second circular arc enclose a radial cross section of the platinum channel, the radial thickness of the second circular arc is greater than the radial thickness of the first circular arc, and the first circular arc and the second circular arc are symmetrically arranged along the symmetry line; A flange is sleeved on the outer wall surface of the platinum channel and is in electrical contact with the platinum channel, the flange comprises an inner ring and an outer ring circumferentially connected to the inner ring; the inner ring comprises a first arc segment located at the top and a second arc segment located at the bottom, the first arc segment and the second arc segment enclose the inner ring, the first arc segment and the second arc segment are symmetrically arranged along the symmetry line; the axial thickness of the first arc segment is less than the axial thickness of the second arc segment; the inner ring is concentrically arranged with the platinum channel, and the outer ring is eccentrically arranged upward relative to the platinum channel in the vertical direction; The second circular arc includes a continuous first wall portion and a second wall portion, the first wall portion is located at the center of the second circular arc, the second wall portion includes two second wall portions, the two second wall portions are respectively located on both sides of the first wall portion, and the radial thickness of the first wall portion is greater than the radial thickness of the second wall portion, and the radial thickness of the second wall portion is greater than the radial thickness of the first circular arc; The outer ring is provided with choke holes, the choke holes are symmetrically arranged along the symmetry line, and the choke holes are located above the inner ring.

2. The heating device for molten glass according to claim 1, characterized in that The radial cross-sectional area of ​​the second circular arc is 30% to 60% of the radial cross-sectional area of ​​the platinum channel.

3. The heating device for molten glass according to claim 1, characterized in that: The axial thickness of the second arc segment is 1.2 to 3 times the axial thickness of the first arc segment.

4. The heating device for molten glass according to claim 1, characterized in that: The upward offset of the center of the outer ring relative to the center of the platinum channel is 10% to 60% of the diameter of the platinum channel.

5. The heating device for molten glass according to claim 1, characterized in that: The shape of the choke hole in the radial cross section is a long strip, a crescent or a dovetail.

6. The heating device for molten glass according to any one of claims 1 to 4, characterized in that: The heating device for molten glass further comprises a cooling tube, wherein the cooling tube is arranged around the outer ring, and a cooling medium flows through the cooling tube.

7. The heating device for molten glass according to any one of claims 1 to 4, characterized in that: The heating device for molten glass further comprises a plurality of reinforcing members, which are arranged at intervals on the inner wall surface of the top of the platinum channel along the length direction of the platinum channel.

8. The heating device for molten glass according to any one of claims 1 to 4, characterized in that: The shape of the radial cross section of the platinum channel is circular, rectangular, triangular, trapezoidal, parallelogram, elliptical or racetrack.

9. The heating device for molten glass according to any one of claims 1 to 4, characterized in that: The material of the inner ring is platinum-based precious metal or platinum-based precious metal alloy; the material of the outer ring is nickel with a purity of at least 99 wt%.

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