A thermal design method for channel heater selection and temperature field distribution

Abstract

The present invention provides a thermal design method for channel heater selection and temperature field distribution. By establishing a three-dimensional model of the heater and its surrounding environment, the existing channel heater is effectively simulated and simulation calculation and analysis are performed according to simulation software to obtain simulation results. The simulation results are judged by the standard conditions of the channel heater, which greatly improves the optimization rate of the channel heater, facilitates the reasonable design of the heater structure, and avoids the problem of the channel heater being vulnerable to damage. The influence of the current and water flow on the temperature field distribution of the heater is analyzed, and the influence of the heater current and water flow on the temperature of the heater itself is effectively detected, thereby improving the service life of the channel heater.

Description

Technical Field

[0001] The invention relates to the field of substrate glass manufacturing, and in particular to a thermal design method for channel heater selection and temperature field distribution. Background Art

[0002] The pool furnace melts a certain proportion of the batch material. The molten glass liquid must go through a series of processes such as heating, clarification, and cooling in the channel before entering the next process. This stage is particularly important and directly determines whether the glass can be formed. In order to achieve a series of processes in the above-mentioned channel, it is necessary to install heaters in each section of the channel to control the temperature of each section. Channel heaters are extremely important in the manufacturing process of substrate glass.

[0003] In actual use, the junction of the inner and outer plates of the channel heater is often damaged due to excessively high or uneven temperatures, affecting its normal use. Therefore, it is necessary to find a suitable channel heater. If the heater is selected through experiments, it will consume a lot of time, financial resources, and material resources. Summary of the invention

[0004] In view of the problem in the prior art that the junction between the inner and outer disks of the channel heater often has poor heating effect due to excessively high or uneven temperature, which causes damage to the channel heater itself, the present invention provides a thermal design method for channel heater selection and temperature field distribution, establishes a three-dimensional model of the channel heater and its surrounding environment, analyzes the internal structure and layout of the heater through simulation software, and finally obtains a channel heater with good heating effect and uniform temperature distribution.

[0005] The present invention is achieved through the following technical solutions:

[0006] A thermal design method for channel heater selection and temperature field distribution includes the following steps:

[0007] Step 1, simulating the structure of the existing channel heater to establish a three-dimensional model of the channel heater to be optimized and its surrounding environment;

[0008] Step 2, performing a simulation numerical analysis on the thermal design of the channel heater to be optimized in the simulation software, and performing simulation calculation on the channel heater to be optimized and its surrounding environment to obtain a simulation result;

[0009] Step 3, judge the simulation results by the standard conditions of the channel heater. For the simulation results that do not meet the conditions, re-enter the data and re-execute steps 1 and 2 in sequence to judge the simulation results by the standard conditions of the channel heater; the simulation results that meet the conditions are set in the three-dimensional model of the channel heater to be optimized to obtain a channel heater with a uniformly distributed temperature field.

[0010] Preferably, in step 1, the channel heater to be optimized includes a channel, a heater body and a thermal insulation material; the heater body is arranged on the channel; the thermal insulation material is arranged on the channel and wrapped around the heater body; the thermal insulation material is arranged in multiple layers from inside to outside, and each layer has a different thermal conductivity.

[0011] Furthermore, the heater body includes a heater inner plate, a heater outer plate and a water pipe; a channel is set through the heater inner plate, and the inner side of the heater inner plate is set in contact with the channel, and the outer side of the heater inner plate is set in contact with the heater outer plate; the water pipe is wrapped along the edge of the heater outer plate, wherein the heater outer plate and the water pipe are partially exposed outside the insulation material.

[0012] Preferably, in step 2, FloEFD thermal simulation software is used to perform external analysis type on the channel heater to be optimized, and the gravity magnitude is set, wherein the gravity acceleration is 9.81 m / s 2 ; Select the fluid material type, solid material type, wall roughness, fluid initial temperature, and solid initial temperature.

[0013] Furthermore, the fluid material types are air and water; the solid material types are platinum and nickel.

[0014] Furthermore, the three-dimensional model of the channel heater to be optimized is locally meshed.

[0015] Furthermore, the simulation analysis is to establish a three-dimensional model, set boundary conditions, material properties, ambient temperature, etc. in the simulation software, and then perform meshing. The three-dimensional model with meshing is simulated and calculated, and the structural temperature distribution cloud map is output to observe the overall temperature distribution of the structure; the temperature value of the highest point at the junction of the platinum plate and the nickel plate and the radial temperature gradient are output to determine whether the standard conditions of the channel heater are met.

[0016] Preferably, in step 3, the standard condition of the channel heater is that the radial temperature gradient of the heating part in the channel heater is less than 3°C / mm, and the temperature at the junction between the heating parts in the heater is lower than 800°C.

[0017] Preferably, in step 3, the simulation results that do not meet the conditions are re-input with data including the material and size of the structure.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The present invention provides a thermal design method for channel heater selection and temperature field distribution. By establishing a three-dimensional model of the heater and its surrounding environment, the existing channel heater is effectively simulated and simulation calculation and analysis are performed according to simulation software to obtain simulation results. The simulation results are judged by the standard conditions of the channel heater, which greatly improves the optimization rate of the channel heater, facilitates the reasonable design of the heater structure, and avoids the problem of the channel heater being vulnerable to damage. The influence of the current and water flow on the temperature field distribution of the heater is analyzed, and the influence of the heater current and water flow on the temperature of the heater itself is effectively detected, thereby improving the service life of the channel heater.

[0020] Furthermore, the channel heater to be optimized includes a channel, a heater body and a thermal insulation material; the existing channel heater is effectively simulated to improve the accuracy of the simulation results; the thermal insulation material is arranged in multiple layers from the inside to the outside, and each layer has a different thermal conductivity, which improves the uniformity of the temperature distribution of the channel heater.

[0021] Furthermore, the inner side of the inner disk of the heater is arranged in contact with the channel, and the outer side of the inner disk of the heater is arranged in contact with the outer disk of the heater; the water pipe is wrapped along the edge of the outer disk of the heater, thereby improving the heating effect on the channel.

[0022] Furthermore, FloEFD thermal simulation software is used to select the type of the channel heater to be optimized and to set the wall roughness, fluid initial temperature and solid initial temperature, which effectively provides a simulation environment for the channel heater to be optimized and ensures the accuracy of the simulation results.

[0023] Furthermore, air and water are used as fluid material types, and platinum and nickel are used as solid material types, which further improves the simulation of existing channel heaters and ensures the accuracy of subsequent simulation results.

[0024] Furthermore, the three-dimensional model of the channel heater to be optimized is locally meshed and encrypted, and the temperature between the channel heaters to be optimized is transferred to avoid temperature loss, thereby ensuring the accuracy of the temperature calculation results at the junction of the channel heaters to be optimized.

[0025] Furthermore, the usability of the obtained heater is improved through simulation analysis.

[0026] Furthermore, the standard conditions for the channel heater are that the radial temperature gradient of the heating part within the channel heater is less than 3°C / mm, ensuring uniform heating of the channel; the temperature at the junction between the heating parts within the heater is lower than 800°C, reducing the risk of the heater itself being damaged due to excessive temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A flowchart of a thermal design method for channel heater selection and temperature field distribution according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the channel heater to be optimized in the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the thermal insulation material of the present invention;

[0030] Figure 4 It is a schematic diagram of the assembly structure of the overall calculation model of the present invention.

[0031] In the figure: 1-channel; 2-heater inner plate; 3-heater outer plate; 4-water pipe; 5-insulation material. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0033] The present invention provides a thermal design method for channel heater selection and temperature field distribution, comprising the following steps:

[0034] Step 1, simulating the structure of the existing channel heater to establish a three-dimensional model of the channel heater to be optimized and its surrounding environment;

[0035] Step 2, performing a simulation numerical analysis on the thermal design of the channel heater to be optimized in the simulation software, and performing simulation calculation on the channel heater to be optimized and its surrounding environment to obtain a simulation result;

[0036] Step 3, judge the simulation results by the standard conditions of the channel heater. For the simulation results that do not meet the conditions, re-enter the data and re-execute steps 1 and 2 in sequence to judge the simulation results by the standard conditions of the channel heater; the simulation results that meet the conditions are set in the three-dimensional model of the channel heater to be optimized to obtain a channel heater with a uniformly distributed temperature field.

[0037] according to Figure 2 , Figure 3 and Figure 4 As shown, the channel heater to be optimized includes a channel 1, a heater body and a thermal insulation material 5; the heater body is arranged on the channel 1; the thermal insulation material 5 is arranged on the channel 1 and wraps the heater body; the thermal insulation material 5 is arranged in multiple layers from the inside to the outside, and each layer is arranged with a different thermal conductivity.

[0038] Among them, the heating channel body includes a heater inner plate 2, a heater outer plate 3 and a water pipe 4; the channel 1 is set through the heater inner plate 2, and the inner side of the heater inner plate 2 is contacted with the channel 1, and the outer side of the heater inner plate 2 is contacted with the heater outer plate 3; the water pipe 4 is wrapped along the edge of the heater outer plate 3, wherein the heater outer plate 3 and the water pipe 4 are partially exposed outside the insulation material 5.

[0039] In the present invention, FloEFD thermal simulation software is used to perform external analysis on the channel heater to be optimized, wherein the external analysis is to expose the heating components and the insulation structure to the air for analysis; the gravity size is set, wherein the gravity acceleration is 9.81m / s 2 ; Select the fluid material type, solid material type, wall roughness, fluid initial temperature and solid initial temperature. Wall roughness is a property of the material. For example, wood and paper have different surface roughness. You need to set it according to the actual situation. The initial temperature is a boundary condition for simulation calculation to ensure the calculation accuracy. Add fluid subdomains, set water flow parameters, add electrical conditions, set current parameters; customize material properties and heat conduction and radiation properties, set the calculation domain size, manually refine the grid, etc., and finally complete the establishment of the simulation system.

[0040] The fluid material types used are air and water; the solid material types used are platinum and nickel, and the simulation analysis is performed at an ambient temperature of 25°C.

[0041] The three-dimensional model of the channel heater to be optimized is locally meshed to ensure temperature transfer between the channel heaters to be optimized, avoid temperature loss, and ensure the accuracy of temperature calculation results at the junction of the channel heaters to be optimized.

[0042] In the present invention, before judging whether the simulation result meets the conditions, the uniform distribution of the heater temperature is judged by the density of the temperature distribution cloud diagram.

[0043] The simulation analysis in the present invention is to establish a three-dimensional model, set boundary conditions, material properties, ambient temperature, etc. in the simulation software, and then perform grid division, perform simulation calculation on the three-dimensional model with grid division, output the structure temperature distribution cloud map, and observe the overall temperature distribution of the structure; output the temperature value of the highest point at the junction of the platinum plate and the nickel plate and the size of the radial temperature gradient to determine whether the standard conditions of the channel heater are met.

[0044] The standard condition of the channel heater in the present invention is that the radial temperature gradient of the heating part in the channel heater is less than 3°C / mm, and the temperature at the junction between the heating parts in the heater is lower than 800°C.

[0045] Among them, the re-input data of the simulation results that do not meet the conditions include the material and size of the structure.

[0046] Example

[0047] according to Figure 1 As shown, the structural material and size of the channel heater are selected, and the three-dimensional model of the channel heater to be optimized is established. The simulation parameters are set, the mesh is divided, and the simulation calculation is performed in the simulation software to obtain the simulation results. According to the simulation results, it is judged whether the standard conditions of the channel heater are met. For the simulation results that do not meet the conditions, the materials and dimensions are re-entered, the three-dimensional model is re-established, and the simulation analysis and calculation are performed again; the simulation results that meet the conditions are set in the three-dimensional model of the channel heater to be optimized, and the channel heater with uniform temperature field distribution is obtained. Then, the current and water flow of the optimized channel heater structure that meets the standard conditions are analyzed and calculated through the simulation software, and the changing law of the temperature field distribution of the heater itself with the changes of the current and water flow is studied to realize the distribution of the heater temperature field.

[0048] In this invention, it is necessary to perform local mesh encryption on the inner disk and outer disk of the key research object to obtain more accurate results; the calculation results should focus on the temperature at the junction of the inner disk 2 and the outer disk 3 of the heater and the channel temperature. Because the temperature at the junction of the inner disk 2 and the outer disk 3 of the heater determines the life of the heater, and the channel temperature determines the heating effect. According to the simulation numerical analysis, the temperature field distribution of the heater body can be obtained as the water flow and current amount change, which is of great significance to actual production.

[0049] Through the above reasonable selection, the numerical simulation analysis of the optimal model is carried out. According to the actual current size and water flow size, the input current is 8000A and the water flow rate is 10m 3 / s, and finally the temperature at the junction of the heater inner disk 2 and the heater outer disk 3 is 764℃, which is lower than the temperature standard of 800℃, and the radial temperature gradient is 2.6℃ / mm, which is lower than the temperature gradient standard of 3℃ / mm, meeting the uniformity requirement.

[0050] Based on the existing channel heater, the present invention uses Croe to establish a three-dimensional model of the heater and its surrounding environment; then reasonable boundary condition settings, calculation domain settings, grid division, etc. are performed to simulate and calculate the heater and its surrounding environment to obtain simulation results; a contour cloud map of temperature distribution is established to improve the internal structure and layout of the heater that does not meet the working requirements, and finally obtain the preferred heater structure. Then, FloEFD software is used to perform thermal simulation analysis to study the change law of the current and water flow on the temperature distribution of the heater body. The present invention can optimize the channel heater structure through FloEFD simulation, solve the problem of unreasonable heater structure design and easy damage of the channel heater in actual production; analyze the influence of the current and water flow on the temperature field distribution of the heater, and solve the problem that the channel temperature can only be controlled by changing the current and water flow of the heater in actual production, and the influence of these changes on the temperature of the heater itself cannot be measured. The channel heater optimized by the present invention can not only extend the service life, but also improve the uniformity of channel heating. Secondly, the optimization of the heater through simulation greatly reduces the loss of time, financial resources and material resources.

Claims

1. A thermal design method for channel heater selection and temperature field distribution, characterized in that: The following steps are included: Step 1, simulating the structure of the existing channel heater to establish a three-dimensional model of the channel heater to be optimized and its surrounding environment; The channel heater to be optimized comprises a channel (1), a heater body and a heat-insulating material (5); the heater body is arranged on the channel (1); the heat-insulating material (5) is arranged on the channel (1) to wrap the heater body; the heat-insulating material (5) is arranged in multiple layers from the inside to the outside, and each layer is arranged with a different thermal conductivity; The heater body comprises an inner heater plate (2), an outer heater plate (3) and a water pipe (4); the channel (1) is arranged to penetrate the inner heater plate (2), and the inner side of the inner heater plate (2) is arranged to contact the channel (1), and the outer side of the inner heater plate (2) is arranged to contact the outer heater plate (3); the water pipe (4) is arranged to wrap around the edge of the outer heater plate (3), wherein the outer heater plate (3) and the water pipe (4) are partially exposed outside the heat insulation material (5); Step 2, performing a simulation numerical analysis on the thermal design of the channel heater to be optimized in the simulation software, and performing simulation calculation on the three-dimensional model of the channel heater to be optimized and its surrounding environment to obtain a simulation result; Step 3, judge the simulation results by the standard conditions of the channel heater. For the simulation results that do not meet the conditions, re-enter the data and re-execute steps 1 and 2 in sequence to judge the simulation results by the standard conditions of the channel heater; the simulation results that meet the conditions are set in the three-dimensional model of the channel heater to be optimized to obtain a channel heater with a uniformly distributed temperature field.

2. A thermal design method for channel heater selection and temperature field distribution according to claim 1, characterized in that: In step 2, FloEFD thermal simulation software is used to perform external analysis type on the channel heater to be optimized, and the gravity magnitude is set, where the gravity acceleration is 9.81m / s 2 ; Select the fluid material type, solid material type, wall roughness, fluid initial temperature, and solid initial temperature.

3. A thermal design method for channel heater selection and temperature field distribution according to claim 2, characterized in that: The fluid material types include air and water; the solid material types include platinum and nickel.

4. A thermal design method for channel heater selection and temperature field distribution according to claim 2, characterized in that: The three-dimensional model of the channel heater to be optimized is locally meshed.

5. A thermal design method for channel heater selection and temperature field distribution according to claim 2, characterized in that: The simulation analysis is to establish a three-dimensional model, set boundary conditions, material properties, and ambient temperature in the three-dimensional model in the simulation software, and then perform meshing. The three-dimensional model with meshes is simulated and calculated, and the temperature distribution cloud map of the structure is output to observe the overall temperature distribution of the structure. The temperature value of the highest point at the junction of the platinum plate and the nickel plate and the size of the radial temperature gradient are output to determine whether the standard conditions of the channel heater are met.

6. A thermal design method for channel heater selection and temperature field distribution according to claim 1, characterized in that: In step 3, the standard condition of the channel heater is that the radial temperature gradient of the heating part in the channel heater is less than 3°C / mm, and the temperature at the junction between the heating parts in the heater is lower than 800°C.

7. A thermal design method for channel heater selection and temperature field distribution according to claim 1, characterized in that: In step 3, the simulation results that do not meet the conditions are re-input with data including the material and size of the structure.

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