Platinum kiln and manufacturing method thereof

Abstract

The invention relates to a platinum kiln and a manufacturing method thereof.The platinum kiln comprises a vertical kiln body, the bottom end of the kiln body is connected with a discharging pipe extending downwards, the discharging pipe is communicated with an inner cavity of the kiln body, heating mechanisms are arranged on the kiln body and the discharging pipe respectively, and crucible brick layers are further arranged on the outer side of the kiln body and the outer side of the discharging pipe in a supported mode; the kiln body and the discharging pipe are made of platinum or platinum-rhodium alloy. The kiln body and the discharge pipe are directly made of platinum or platinum-rhodium alloy, the kiln body is made of precious metal, the clarification temperature of the kiln can be greatly increased and can be increased to 1700 DEG C to the maximum degree, so that higher-end glass can be manufactured, the kiln body is made of the precious metal, pollution of brick erosion to molten glass can be reduced, and the glass quality is improved; the crucible brick layer effectively supports the main body and balances the stress of the main body. And the heating mechanism adopts a heating flange made of platinum or platinum rhodium alloy and is externally connected with an electric heating loop, so that the high-clarification-temperature heating requirement of the kiln body can be met, and the environment is better protected.

Description

Technical Field

[0001] The invention belongs to the technical field of glass manufacturing and forming in chemistry and metallurgy, and specifically relates to a platinum kiln and a manufacturing method thereof. Background Art

[0002] The kiln is the most important thermal process equipment in a glass factory. Existing kilns include the fully electric melting furnace disclosed in Chinese patent CN203582693U, which has an electric melting furnace body and a glass liquid channel connected thereto. A silicon-carbon heating rod is installed in the glass liquid channel to maintain a fixed temperature for the glass liquid, and the glass liquid channel has a discharge port. The glass liquid channel consists of three layers, namely, a corundum layer, a refractory brick layer, and an insulation brick layer from the inside to the outside. The inner wall of the glass liquid channel and the discharge port are also coated with a palladium-rhodium alloy layer. However, this type of kiln has limited capabilities for clarification of the glass liquid, temperature increase upper limit, and temperature maintenance, and it is difficult to meet the high-quality mass production of high-end glass.

[0003] There are also platinum channel structures in the prior art, such as the one disclosed in CN109336366A, but it adopts a horizontal design, which is inconvenient to use and the overall structure is too complicated, and needs further improvement and optimization. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is how to provide a platinum kiln and a manufacturing method thereof to make the structure simpler and to meet the high-quality mass production needs of high-end glass, thereby achieving the effect of meeting production and quality requirements.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: A platinum kiln comprises a vertical kiln body, the bottom end of the kiln body is connected to a discharge pipe extending downward, the discharge pipe is communicated with the inner cavity of the kiln body, the kiln body and the discharge pipe are respectively provided with heating mechanisms, and the kiln body and the discharge pipe are also supported on the outer sides with a crucible brick layer; the kiln body and the discharge pipe are made of platinum or platinum-rhodium alloy.

[0006] To further improve the above technical solution, the heating mechanism includes a heating flange, which is composed of a coplanar flange ring plate and a side support plate, and the side support plate is radially connected to the flange ring plate and is an integrated structure; The material of the heating flange is platinum or platinum-rhodium alloy.

[0007] Furthermore, a feeding port is provided on the upper part of the side wall of the kiln body, and the feeding port penetrates upward through the top of the kiln body to form a notch shape; A corresponding circle of flanges is arranged at the radial outer edge of the top edge of the kiln body, and a top cover brick for closing the top of the kiln body is slidably placed on the flanges.

[0008] Furthermore, an exhaust hole is penetrated through the top cover brick, and a stirring rod is movably inserted into the kiln body along the exhaust hole.

[0009] Furthermore, the crucible brick layer comprises an upper crucible brick layer coated on the outer circumferential side of the kiln body, and a lower crucible brick layer coated on the outer circumferential side of the discharge pipe; the outer circumferential side of the upper crucible brick layer is coated with an upper insulation brick layer, and the upper end of the lower crucible brick layer is sleeved with a circle of middle crucible brick layer, and the lower surfaces of the kiln body, the upper crucible brick layer and the upper insulation brick layer are all in contact with the upper surface of the middle crucible brick layer; The outer side of the lower crucible brick layer is covered with a lower insulation brick layer, and the lower end of the discharge pipe passes through the lower insulation brick layer.

[0010] Furthermore, there are at least two heating flanges on the kiln body, which are vertically spaced and sleeved on the outer circumferential side of the kiln body through flange ring plates; There are at least two heating flanges on the discharge pipe, which are vertically spaced and sleeved on the outer circumferential side of the discharge pipe through flange ring plates; The side support plates of each heating flange extend out of the corresponding insulation brick layer so as to be connected to an external heating electric circuit.

[0011] Furthermore, each heating flange is arranged horizontally; among each heating flange on the kiln body, the bottom one is flush with the bottom surface of the kiln body, and the top one is flush with the bottom edge of the feeding port; On the discharge pipe, the lowest heating flange is flush with the lower surface of the discharge pipe.

[0012] Furthermore, it also includes a supporting steel structure, which includes a horizontal supporting steel plate, a mounting hole is vertically penetrated through the supporting steel plate, and a plurality of supporting columns arranged circumferentially with the mounting holes are connected to the lower surface of the supporting steel plate; The middle crucible brick layer is placed on the supporting steel plate, the lower insulation brick layer passes downward through the mounting hole, and the bottom end of the discharge pipe is vertically higher than the bottom end of the supporting column.

[0013] Furthermore, the material of the upper crucible brick layer and the lower crucible brick layer is sintered high zirconium brick, fused high zirconium brick, sintered alumina brick or fused alumina brick; The top cover brick is made of sintered high zirconium brick, fused high zirconium brick, sintered alumina brick, fused alumina brick or alumina insulation brick; The upper insulation brick layer and the lower insulation brick layer are made of insulation board, insulation cotton or alumina insulation brick.

[0014] The present invention also provides a method for manufacturing the above-mentioned platinum kiln, comprising the following steps: 1) Prepare the kiln body and connect the discharge pipe; build the supporting steel structure; 2) Laying a medium crucible brick layer on the supporting steel plate of the supporting steel structure; 3) The kiln body is placed on the middle crucible brick layer, and the discharge pipe passes through the middle of the middle crucible brick layer and the installation hole downward; 4) Install the upper crucible brick layer and the lower crucible brick layer; 5) Install the upper insulation brick layer and the lower insulation brick layer; 6) Install the top cover bricks.

[0015] Furthermore, between step 3) and step 4), there is also step 3.1) on-site welding of each heating flange; After step 6), the step 7) is also included: connecting the outer end of the side support plate of the heating flange to form a heating electric circuit.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The platinum kiln of the present invention, the kiln body and the discharge pipe are directly made of platinum or platinum-rhodium alloy. The kiln body made of precious metals can greatly increase the clarification temperature of the kiln, which can be raised to 1700°C at most, so as to produce higher-end glass. The kiln body made of precious metals can also reduce the pollution of glass liquid caused by brick erosion and improve the quality of glass. The platinum heating flange can support the high clarification temperature heating requirements of the kiln body. It adopts pure electric heating, basically does not produce exhaust gas, and meets environmental protection requirements.

[0017] 2. The platinum kiln and manufacturing method of the present invention can stably build and manufacture the platinum kiln, with a convenient installation process and a smooth and stable use process, which can fully guarantee the heating and heat preservation of the kiln body and the discharge pipe to prevent heat loss and meet the quality and output requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a platinum-made part in a platinum kiln in an embodiment; Figure 2 is a schematic diagram of a platinum kiln of an embodiment; Figure 3 A schematic diagram of the installation of a platinum kiln in an embodiment; Figure 4 A separate schematic diagram of a top cover brick in the embodiment (enlarged); Among them, 1-feeding port, 2-heating flange, 5-kiln body, 6-discharging pipe, 11-top cover brick, 13-upper crucible brick layer, 15-upper insulation brick layer, 17-middle crucible brick layer, 18-lower crucible brick layer, 19-lower insulation brick layer, 31-support steel plate, 32-support column. DETAILED DESCRIPTION

[0019] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0020] See also Figure 1A platinum kiln in a specific embodiment includes a vertical kiln body 5, which is cylindrical and sealed at the bottom. A discharge pipe 6 extending downward is connected to the sealed bottom. The discharge pipe 6 is connected to the inner cavity of the kiln body 5. A heating mechanism is respectively provided on the kiln body 5 and the discharge pipe 6. A crucible brick layer is also supported on the outer side of the kiln body 5 and the discharge pipe 6. The kiln body 5 and the discharge pipe 6 are made of platinum or platinum-rhodium alloy.

[0021] The platinum kiln of the embodiment, the kiln body 5 and the discharge pipe 6 are directly made of platinum or platinum-rhodium alloy. The kiln body 5 made of precious metals can greatly increase the clarification temperature of the kiln, which can be raised to 1700°C at most, so that higher-end glass can be produced. The kiln body 5 made of precious metals can also reduce the pollution of glass liquid caused by brick erosion and improve the quality of glass. The crucible brick layer can effectively support the main body and balance the force on the main body.

[0022] Wherein, the heating mechanism includes a heating flange 2, which is composed of a coplanar flange ring plate and a side support plate, and the side support plate is radially connected to the flange ring plate and is an integral structure; the material of the heating flange 2 is platinum or platinum-rhodium alloy.

[0023] In this way, the high clarification temperature heating demand of the kiln body 5 can be supported, pure electric heating is adopted, basically no waste gas is generated, and environmental protection requirements are met.

[0024] Please continue to see Figure 1 , Figure 2 A charging port 1 is provided on the upper part of the side wall of the kiln body 5, and the charging port 1 penetrates upward through the top of the kiln body 5 to form a notch; a corresponding circle of flanges is provided on the radial outer edge of the top edge of the kiln body 5, and a top cover brick 11 for closing the top of the kiln body 5 is slidably placed on the flange.

[0025] In this way, it is convenient to add materials from the specially designed smaller feeding port 1, which prevents heat leakage and is conducive to heating and heat preservation.

[0026] See also Figure 4 , wherein, an exhaust hole is formed through the top cover brick 11, and a stirring rod (not shown in the figure) is provided along the exhaust hole and inserted into the kiln body 5. In this way, the space structure is reasonably utilized, the functional design is integrated, and the stirring rod is used to effectively solve the glass streak problem. During implementation, it is preferred to design the top cover brick 11 into two symmetrical halves, and the exhaust holes are correspondingly formed in the corresponding halves of the top cover brick 11, which is convenient for sliding and moving, and improves the convenience of use.

[0027] Please continue to see Figure 2Specifically, the kiln body 5 is a circular cylindrical structure, and the discharge pipe 6 extending downward and connected to the sealed bottom end thereof is also a circular pipe. The crucible brick layer includes an upper crucible brick layer 13 coated on the outer circumferential side of the kiln body 5, and a lower crucible brick layer 18 coated on the outer circumferential side of the discharge pipe 6; the outer circumferential side of the upper crucible brick layer 13 is coated with an upper insulation brick layer 15, and the upper end of the lower crucible brick layer 18 is sleeved with a circle of middle crucible brick layer 17, and the lower surfaces of the kiln body 5, the upper crucible brick layer 13 and the upper insulation brick layer 15 are all in contact with the upper surface of the middle crucible brick layer 17; the outer side of the lower crucible brick layer 18 is coated with a lower insulation brick layer 19, and the lower end of the discharge pipe 6 passes through the lower insulation brick layer 19.

[0028] In this way, the heating and insulation of the kiln body 5 and the discharge pipe 6 are fully guaranteed to prevent heat loss; the crucible layer and the insulation layer have compact structures and occupy less space. The middle crucible brick layer 17 can effectively support the kiln body 5, the upper crucible brick layer 13 and the upper insulation brick layer 15, playing the role of connecting the upper and the lower; the upper crucible brick layer 13 effectively supports the kiln body 5 and balances the force of the kiln body 5; the lower crucible brick layer 18 effectively supports the discharge pipe 6 and balances the force of the discharge pipe 6.

[0029] Please continue to see Figure 1 The number of heating flanges 2 on the kiln body 5 is determined according to the amount of melting and the specific height of the kiln body 5, and is at least two as shown in the figure in this embodiment. The heating flanges 2 are fixedly sleeved horizontally on the outer circumferential side of the kiln body 5 through the flange ring plate, and the lower one is flush with the lower surface of the kiln body 5, and the upper one is flush with the lower edge of the charging port 1; there are also two heating flanges 2 on the discharge pipe 6, which are fixedly sleeved horizontally on the outer circumferential side of the discharge pipe 6 through the flange ring plate, and the lower one is flush with the lower surface of the discharge pipe 6; the heating flanges 2 on the discharge pipe 6 can effectively heat and insulate the glass liquid during the discharge process of the kiln body 5, and prevent the glass liquid from losing heat or causing large fluctuations. The side support plates of each heating flange 2 extend out of the corresponding insulation brick layer to connect an external heating electric circuit (not shown in the figure), which does not affect the coating of the crucible layer and the insulation layer, and is easy to manufacture and build.

[0030] See also Figure 3 The platinum kiln of the embodiment also includes a supporting steel structure, which includes a horizontal supporting steel plate 31, and a mounting hole is vertically penetrated on the supporting steel plate 31. The lower surface of the supporting steel plate 31 is connected to a plurality of supporting columns 32 arranged circumferentially with the mounting holes; the supporting steel plate 31 shown in the figure has a square shape, and four supporting columns 32 are provided corresponding to the four corners. The middle crucible brick layer 17 is placed on the supporting steel plate 31, and the lower insulation brick layer 19 passes downward through the mounting holes. The bottom end of the discharge pipe 6 is vertically higher than the bottom end of the supporting column 32, which is convenient for external connection. The kiln body 5 is supported and fastened by the supporting steel structure, which is convenient for installation and can also ensure smooth and stable use.

[0031] Please continue to see Figure 2 In order to ensure the effects of heating, heat preservation and heat loss prevention, during the specific manufacturing, the material of the upper crucible brick layer 13 and the lower crucible brick layer 18 can be selected from sintered high zirconium bricks, fused high zirconium bricks, sintered alumina bricks or fused alumina bricks. The material of the top cover brick 11 can be selected from sintered high zirconium bricks, fused high zirconium bricks, sintered alumina bricks, fused alumina bricks or alumina insulation bricks. The material of the upper insulation brick layer 15 and the lower insulation brick layer 19 can be selected from insulation board, insulation cotton or alumina insulation bricks.

[0032] The present invention also provides a method for manufacturing the above-mentioned platinum kiln, comprising the following steps: 1) Prepare the kiln body 5 and connect the discharge pipe 6; build the supporting steel structure; When preparing the kiln body, first determine the daily output, such as 50kg-5 tons, which can be unloaded continuously or intermittently; the appropriate heating flange cross-sectional area can be selected according to the energy required for melting the glass material. The energy formula for melting glass is: Q=cm△t, where c is the specific heat capacity (J / kg℃), m is the mass (kg), and △t is the temperature change (℃). According to the strength of platinum, the platinum wall thickness is generally selected to be 0.5-5mm, and the cross-sectional area of ​​platinum and platinum-rhodium alloy can pass 10A current per square millimeter. The cross-sectional area required for the kiln body can be calculated by Joule's law, Ohm's law and the resistance formula, and thus the diameter of the platinum body of the kiln can be calculated; Joule's law: Q=I²Rt, where Q is electric heat (J), I is the current passing through the conductor (A), R is the resistance value of the conductor (Ω), and t is the power-on time (s); Ohm's law: I=U / R, where I is the current intensity of the conductor (A), U is the voltage across the conductor (V), and R is the resistance value of the conductor (Ω); The resistance formula of platinum and platinum-rhodium alloy is R=ρL / S, where ρ is the resistivity (Ω•m), L is the length of the conductor (m), and S is the cross-sectional area of ​​the conductor (m 2 ). The furnace body is the main melting and clarification area. The height of the glass liquid level is usually at 2 / 3-1 / 10 of the furnace body, and the distance between the glass liquid level and the upper edge of the furnace body is ≥10mm; the glass storage capacity of the furnace body is ≥1 / 12 ​​of the designed daily output. According to the designed daily output of glass, the appropriate height can be selected according to the pipe diameter of the furnace body. The total length of the discharge pipe is 300-500mm, and the discharge pipe diameter can be calculated by the following formula: , the theoretical formula for pressure head loss of straight circular pipe, Where H is the pressure head loss (M), μ is the glass viscosity (Kg / MS), L is the length of each platinum section (M), and Q is the glass volume flow rate (M 3 / S), ρ is the glass density (Kg / M 3 ), D is the diameter of each segment (M), g is the acceleration due to gravity (M / S 2 ).

[0033] 2) Laying a middle crucible brick layer 17 on the supporting steel plate 31 of the supporting steel structure; 3) The kiln body 5 is placed on the middle crucible brick layer 17, and the discharge pipe 6 passes downward from the middle of the middle crucible brick layer 17 and the installation hole; 3.1) On-site welding of each heating flange 2; 4) Installing the upper crucible brick layer 13 and the lower crucible brick layer 18; 5) Install the upper insulation brick layer 15 and the lower insulation brick layer 19; 6) Install the top cover brick 11; 7) The outer end of the side support plate of the heating flange 2 is connected to form a heating electrical circuit.

[0034] In this way, the platinum kiln can be stably built and manufactured, the installation process is convenient, and the use process is smooth and stable.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A platinum kiln, characterized in that: It comprises a vertical kiln body, the bottom end of which is connected with a discharge pipe extending downward, the discharge pipe is communicated with the inner cavity of the kiln body, heating mechanisms are respectively provided on the kiln body and the discharge pipe, and crucible brick layers are also supported on the outer sides of the kiln body and the discharge pipe; the kiln body and the discharge pipe are made of platinum or platinum-rhodium alloy.

2. A platinum kiln according to claim 1, characterized in that: The heating mechanism comprises a heating flange, which is composed of a coplanar flange ring plate and a side support plate, and the side support plate is radially connected to the flange ring plate and is an integral structure; The material of the heating flange is platinum or platinum-rhodium alloy.

3. A platinum kiln according to claim 2, characterized in that: A charging port is provided on the upper part of the side wall of the kiln body, and the charging port penetrates upward through the top of the kiln body to form a notch shape; A corresponding circle of flanges is arranged at the radial outer edge of the top edge of the kiln body, and a top cover brick for closing the top of the kiln body is slidably placed on the flanges.

4. A platinum kiln according to claim 3, characterized in that: An exhaust hole is penetrated through the top cover brick, and a stirring rod is movably inserted into the kiln body along the exhaust hole.

5. A platinum kiln according to claim 3, characterized in that: The crucible brick layer comprises an upper crucible brick layer coated on the outer circumferential side of the kiln body, and a lower crucible brick layer coated on the outer circumferential side of the discharge pipe; the outer circumferential side of the upper crucible brick layer is coated with an upper insulation brick layer, and the upper end of the lower crucible brick layer is sleeved with a circle of middle crucible brick layer, and the lower surfaces of the kiln body, the upper crucible brick layer and the upper insulation brick layer are all in contact with the upper surface of the middle crucible brick layer; The outer side of the lower crucible brick layer is covered with a lower insulation brick layer, and the lower end of the discharge pipe passes through the lower insulation brick layer.

6. A platinum kiln according to claim 5, characterized in that: There are at least two heating flanges on the kiln body, which are vertically spaced and sleeved on the outer circumferential side of the kiln body through flange ring plates; There are at least two heating flanges on the discharge pipe, which are vertically spaced and sleeved on the outer circumferential side of the discharge pipe through flange ring plates; The side support plates of each heating flange extend out of the corresponding insulation brick layer so as to be connected to an external heating electric circuit.

7. A platinum kiln according to claim 6, characterized in that: Each heating flange is arranged horizontally; among the heating flanges on the kiln body, the bottom one is flush with the bottom surface of the kiln body, and the top one is flush with the bottom edge of the charging port; On the discharge pipe, the lowest heating flange is flush with the lower surface of the discharge pipe.

8. A platinum kiln according to claim 7, characterized in that: It also includes a supporting steel structure, which includes a horizontal supporting steel plate, a mounting hole is vertically penetrated through the supporting steel plate, and a plurality of supporting columns arranged circumferentially with the mounting holes are connected to the lower surface of the supporting steel plate; The middle crucible brick layer is placed on the supporting steel plate, the lower insulation brick layer passes downward through the installation hole, and the bottom end of the discharge pipe is higher than the bottom end of the supporting column in the vertical direction.

9. A platinum kiln according to any one of claims 5 to 8, characterized in that: The materials of the upper crucible brick layer and the lower crucible brick layer are sintered high zirconium bricks, fused high zirconium bricks, sintered alumina bricks or fused alumina bricks; The top cover brick is made of sintered high zirconium brick, fused high zirconium brick, sintered alumina brick, fused alumina brick or alumina insulation brick; The upper insulation brick layer and the lower insulation brick layer are made of insulation board, insulation cotton or alumina insulation brick.

10. The method for manufacturing a platinum kiln according to claim 8, characterized in that: The steps include: 1) Prepare the kiln body and connect the discharge pipe; build the supporting steel structure; 2) Laying a medium crucible brick layer on the supporting steel plate of the supporting steel structure; 3) The kiln body is placed on the middle crucible brick layer, and the discharge pipe passes through the middle of the middle crucible brick layer and the installation hole downward; 4) Install the upper crucible brick layer and the lower crucible brick layer; 5) Install the upper insulation brick layer and the lower insulation brick layer; 6) Install the top cover bricks.

11. The method for manufacturing a platinum kiln according to claim 10, characterized in that: Between step 3) and step 4), step 3.1) on-site welding of each heating flange is also included; After step 6), the step 7) is also included: connecting the outer end of the side support plate of the heating flange to form a heating electric circuit.

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