CN112668214A - Thermal design method for channel heater model selection and temperature field distribution - Google Patents
Thermal design method for channel heater model selection and temperature field distribution Download PDFInfo
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- CN112668214A CN112668214A CN202011376792.4A CN202011376792A CN112668214A CN 112668214 A CN112668214 A CN 112668214A CN 202011376792 A CN202011376792 A CN 202011376792A CN 112668214 A CN112668214 A CN 112668214A
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- 238000009826 distribution Methods 0.000 title claims abstract description 35
- 238000013461 design Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 239000012774 insulation material Substances 0.000 claims description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910052697 platinum Inorganic materials 0.000 claims description 7
- 239000011343 solid material Substances 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
The invention provides a thermal design method for channel heater type selection and temperature field distribution, which effectively simulates the prior channel heater to carry out simulation calculation and analysis according to simulation software by establishing a three-dimensional model of the heater and the surrounding environment thereof so as to obtain a simulation result; the simulation result is judged according to the standard condition of the channel heater, so that the optimization rate of the channel heater is greatly improved, the reasonable design of the heater structure is facilitated, and the problem that the channel heater is easy to damage is avoided; the influence of the magnitude of the current and the magnitude of the water flow on the temperature field distribution of the heater is analyzed, the influence of the magnitude of the current and the magnitude of the water flow of the heater on the temperature of the heater is effectively detected, and the service life of the channel heater is prolonged.
Description
Technical Field
The invention relates to the field of substrate glass manufacturing, in particular to a thermal design method for channel heater type selection and temperature field distribution.
Background
The tank furnace melts the batch materials in a certain proportion, and the molten glass can enter the next procedure after being subjected to a series of treatments such as heating, clarification and cooling through the channel, which is particularly important and directly determines that the glass can not be formed. In order to achieve the above-described series of processes at the passage, it is necessary to install a heater at each section of the passage to control the temperature of each section. Channel heaters are extremely important in substrate glass manufacturing processes.
In the actual use process, the junction of the inner disk and the outer disk of the channel heater is often damaged due to overhigh or uneven temperature, so that the normal use of the channel heater is influenced. Therefore, a suitable channel heater needs to be found. If the heater selection is performed through experiments, a lot of time, money and material resources are consumed.
Disclosure of Invention
Aiming at the problem that the heating effect is poor and the channel heater is damaged due to overhigh or uneven temperature at the junction of an inner disc and an outer disc of the channel heater in the prior art, the invention provides a thermal design method for channel heater type selection and temperature field distribution, which is used for establishing a three-dimensional model of the channel heater and the surrounding environment of the channel heater and analyzing the structure and layout of the interior of the heater through simulation software to finally obtain the channel heater with good heating effect and even temperature distribution.
The invention is realized by the following technical scheme:
a thermal design method for channel heater type selection and temperature field distribution comprises the following steps,
Preferably, in step 1, the channel heater to be optimized comprises a channel, a heater body and a heat insulating material; the heater body is arranged on the channel; the heat insulation material is arranged on the channel and wraps the heater body; the heat insulation material is arranged in multiple layers from inside to outside, and each layer is provided with different heat conductivities.
Further, the heater body comprises a heater inner disc, a heater outer disc and a water pipe; the channel penetrates through the inner disc of the heater, the inner side of the inner disc of the heater is arranged in contact with the channel, and the outer side of the inner disc of the heater is arranged in contact with the outer disc of the heater; the water pipe is wrapped along the edge of the outer heater disc, wherein the outer heater disc and the water pipe are partially exposed outside the heat insulation material.
Preferably, in step 2, FloEFD thermal simulation software is adopted to perform external analysis on the channel heater to be optimized, and the gravity is set, wherein the gravity acceleration is 9.81m/s2(ii) a The fluid material type, solid material type, wall roughness, fluid onset temperature, and solid onset temperature are selected.
Further, the fluid material types adopt air and water; the solid material types employ platinum and nickel.
Further, the three-dimensional model of the channel heater to be optimized is subjected to local mesh encryption.
Further, simulation analysis is to establish a three-dimensional model, set boundary conditions, material properties, environment temperature and the like in simulation software, then perform grid division, perform simulation calculation on the three-dimensional model with the grid division, output a structural temperature distribution cloud chart, and observe the overall temperature distribution condition of the structure; and outputting the highest temperature value of the temperature at the junction of the platinum disk and the nickel disk and the magnitude of the radial temperature gradient, and judging whether the standard conditions of the channel heater are met.
Preferably, in step 3, the standard conditions of the channel heater are that the temperature gradient of the heating parts in the channel heater along the radial direction is less than 3 ℃/mm, and the temperature of the joint between the heating parts in the heater is less than 800 ℃.
Preferably, in step 3, the simulation result that does not satisfy the condition is re-input with data including the material and size of the structure.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a thermal design method for channel heater type selection and temperature field distribution, which effectively simulates the prior channel heater to carry out simulation calculation and analysis according to simulation software by establishing a three-dimensional model of the heater and the surrounding environment thereof so as to obtain a simulation result; the simulation result is judged according to the standard condition of the channel heater, so that the optimization rate of the channel heater is greatly improved, the reasonable design of the heater structure is facilitated, and the problem that the channel heater is easy to damage is avoided; the influence of the magnitude of the current and the magnitude of the water flow on the temperature field distribution of the heater is analyzed, the influence of the magnitude of the current and the magnitude of the water flow of the heater on the temperature of the heater is effectively detected, and the service life of the channel heater is prolonged.
Further, the channel heater to be optimized comprises a channel, a heater body and a heat insulation material; the existing channel heater is effectively simulated, so that the accuracy of a simulation result is improved; the heat insulation material is arranged in multiple layers from inside to outside, and each layer is provided with different heat conductivities, so that the temperature distribution uniformity of the channel heater is improved.
Furthermore, the inner side of the inner heater disc is arranged in contact with the channel, and the outer side of the inner heater disc is arranged in contact with the outer heater disc; the water pipe is arranged along the edge of the outer disc of the heater in a wrapping mode, and the heating effect on the channel is improved.
Furthermore, FloEFD thermal simulation software is adopted to select the type of the channel heater to be optimized and set the wall surface roughness, the fluid initial temperature and the solid initial temperature, so that a simulation environment is effectively provided for the channel heater to be optimized, and the accuracy of a simulation result is ensured.
Further, the fluid material type employs air and water; the solid material type adopts platinum and nickel, so that the simulation of the existing channel heater is further improved, and the accuracy of a later simulation result is ensured.
Furthermore, the three-dimensional model of the channel heater to be optimized is subjected to local grid encryption, temperature transfer between the channel heaters to be optimized is realized, temperature loss is avoided, and the accuracy of the temperature calculation result of the joint of the channel heaters to be optimized is ensured.
Further, the usability of the resulting heater is improved by simulation analysis.
Furthermore, the standard condition of the channel heater is that the temperature gradient of a heating part in the channel heater along the radial direction is less than 3 ℃/mm, so that the uniformity of heating the channel is ensured; the temperature of the joint between the heating parts in the heater is lower than 800 ℃, so that the risk of damage of the heater due to overhigh temperature is reduced.
Drawings
FIG. 1 is a block flow diagram of a thermal design method for channel heater selection and temperature field distribution in accordance with the present invention;
FIG. 2 is a schematic diagram of a channel heater configuration to be optimized in accordance with the present invention;
FIG. 3 is a schematic structural view of the thermal insulation material of the present invention;
FIG. 4 is a schematic diagram of an overall calculation model assembly structure according to the present invention.
In the figure: 1-a channel; 2-inner disc of heater; 3-outer disc of heater; 4-a water pipe; 5-heat insulation material.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a thermal design method for channel heater model selection and temperature field distribution, which comprises the following steps,
According to fig. 2, 3 and 4, the tunnel heater to be optimized comprises a tunnel 1, a heater body and a thermal insulation material 5; the heater body is arranged on the channel 1; the heat insulation material 5 is arranged on the channel 1 in a manner of wrapping the heater body; the heat insulation material 5 is arranged in a plurality of layers from inside to outside, and each layer is provided with different heat conductivities.
The heating channel body comprises a heater inner disc 2, a heater outer disc 3 and a water pipe 4; the channel 1 penetrates through the inner heater disc 2, the inner side of the inner heater disc 2 is in contact with the channel 1, and the outer side of the inner heater disc 2 is in contact with the outer heater disc 3; the water pipe 4 is wrapped along the edge of the outer heater disc 3, wherein the outer heater disc 3 and the water pipe 4 are partially exposed outside the heat insulation material 5.
The method adopts FloEFD thermal simulation software to carry out external analysis on a channel heater to be optimized, wherein the external analysis is to expose a heating part and a heat insulation structure in the air for analysis; setting the gravity, wherein the gravity acceleration is 9.81m/s2(ii) a The fluid material type, solid material type, wall roughness, fluid initial temperature, and solid initial temperature are selected, wherein wall roughness is a property of the material, such as wood and paper, that varies in surface roughness and is set as desired. The initial temperature is a boundary condition for simulation calculation, and is used for ensuring the calculation accuracy, adding a fluid subdomain, setting a water flow parameter, adding an electric condition and setting a current parameter; customizing material properties and heat conduction and heat radiation properties, setting the size of a calculation domain, manually refining a grid and the like, and finally completing simulationAnd (5) establishing a system.
Wherein, the fluid material type adopts air and water; solid material types used platinum and nickel, with simulation analysis performed at an ambient temperature of 25 ℃.
The three-dimensional model of the channel heater to be optimized is subjected to local grid encryption, so that the temperature transfer between the channel heaters to be optimized is ensured, the temperature loss is avoided, and the accuracy of the temperature calculation result at the joint of the channel heaters to be optimized is ensured.
According to the invention, the uniform distribution of the heater temperature length is judged according to the density degree of the temperature distribution cloud picture before judging whether the simulation result meets the condition.
In the invention, simulation analysis is to establish a three-dimensional model, set boundary conditions, material properties, environmental temperature and the like in simulation software, then carry out grid division, carry out simulation calculation on the three-dimensional model with the grids divided, output a structural temperature distribution cloud picture and observe the overall temperature distribution condition of the structure; and outputting the highest temperature value of the temperature at the junction of the platinum disk and the nickel disk and the magnitude of the radial temperature gradient, and judging whether the standard conditions of the channel heater are met.
The standard conditions of the channel heater in the invention are that the temperature gradient of the heating part in the channel heater along the radial direction is less than 3 ℃/mm, and the temperature of the joint between the heating parts in the heater is less than 800 ℃.
Wherein the simulation result re-input data that does not satisfy the condition includes the material and the size of the structure.
Examples
According to the method, as shown in fig. 1, a structural material and a size of a channel heater are selected, a three-dimensional model of the channel heater to be optimized is established, simulation parameters are set, gridding is divided, and simulation calculation is carried out in simulation software to obtain a simulation result, whether standard conditions of the channel heater are met is judged according to the simulation result, the material and the size are input again in the simulation result which does not meet the conditions, the three-dimensional model is established again, and simulation analysis and calculation are carried out again; the simulation result meeting the conditions is set in a three-dimensional model of the channel heater to be optimized to obtain the channel heater with uniformly distributed temperature fields, and then simulation software is used for analyzing and calculating the current magnitude and the water flow magnitude of the structure of the optimized channel heater meeting the standard conditions, researching the change rule of the current magnitude and the water flow magnitude change of the temperature field distribution of the heater, and realizing the distribution of the temperature fields of the heaters.
In the invention, local grid encryption needs to be carried out on the inner disk and the outer disk of the key research object, thereby obtaining more accurate results; the calculation result focuses on the temperature of the junction between the inner heater disc 2 and the outer heater disc 3 and the channel temperature. Since the temperature at the junction of the inner heater disk 2 and the outer heater disk 3 determines the life of the heater, the channel temperature determines the heating effect. According to simulation numerical analysis, the rule that the temperature field distribution of the heater body changes along with the water flow and the current magnitude can be obtained, and the method has great significance for actual production.
Through the reasonable model selection, the optimized model is subjected to numerical simulation analysis, current 8000A and water flow 10m are input according to the actual current and water flow3And/s, finally obtaining that the temperature of the joint of the inner disc 2 of the heater and the outer disc 3 of the heater is 764 ℃, is lower than the temperature standard of 800 ℃, and the radial temperature gradient is 2.6 ℃/mm and is less than the temperature gradient standard of 3 ℃/mm, thereby meeting the requirement of uniformity.
The invention establishes a three-dimensional model of a heater and the surrounding environment thereof by applying Croe on the basis of the existing channel heater; carrying out reasonable boundary condition setting, calculation domain setting, grid division and the like to carry out simulation calculation on the heater and the surrounding environment thereof to obtain a simulation result; and (3) establishing a contour line cloud chart of the temperature distribution to improve the structure and the layout of the interior of the heater which do not meet the working requirement, and finally obtaining the preferred heater structure. And then, performing thermal simulation analysis on the heater body by using FloEFD software, and researching the change rule of the magnitude of current and the magnitude of water flow on the temperature distribution of the heater body. The invention can optimize the channel heater structure through FloEFD simulation, and solves the problems that the heater structure is unreasonable in design and the channel heater is easy to damage in actual production; the influence of the magnitude of the current and the magnitude of the water flow on the temperature field distribution of the heater is analyzed, and the problem that the influence of the changes on the temperature of the heater can not be measured because the temperature of a channel can only be controlled by changing the magnitude of the current and the magnitude of the water flow of the heater in actual production is solved. The channel heater optimized by the invention not only can prolong the service time and improve the uniformity of channel heating, but also greatly reduces the loss of time, financial resources and material resources by optimizing the heater through analog simulation.
Claims (9)
1. A thermal design method for channel heater model selection and temperature field distribution is characterized by comprising the following steps,
step 1, simulating the structure of the existing channel heater to establish a three-dimensional model of the channel heater to be optimized and the surrounding environment thereof;
step 2, performing simulation numerical analysis on the thermal design of the channel heater to be optimized in simulation software, and performing simulation calculation on the channel heater to be optimized and the surrounding environment thereof to obtain a simulation result;
step 3, judging the simulation result through the standard condition of the channel heater, inputting data again for the simulation result which does not meet the condition, executing the step 1 and the step 2 again in sequence, and judging the standard condition of the channel heater for the simulation result; and setting the simulation result meeting the conditions in a three-dimensional model of the channel heater to be optimized to obtain the channel heater with uniformly distributed temperature fields.
2. The thermal design method for channel heater selection and temperature field distribution according to claim 1, wherein in step 1, the channel heater to be optimized comprises a channel (1), a heater body and a thermal insulation material (5); the heater body is arranged on the channel (1); the heat insulation material (5) is arranged on the channel (1) in a way of wrapping the heater body; the heat insulation material (5) is arranged in a plurality of layers from inside to outside, and each layer is provided with different heat conductivities.
3. A thermal design method for channel heater selection and temperature field distribution according to claim 2, characterized in that the heater body comprises a heater inner disc (2), a heater outer disc (3) and a water pipe (4); the channel (1) penetrates through the inner heater disc (2), the inner side of the inner heater disc (2) is arranged in contact with the channel (1), and the outer side of the inner heater disc (2) is arranged in contact with the outer heater disc (3); the water pipe (4) is wrapped along the edge of the outer heater disc (3), wherein the outer heater disc (3) and the water pipe (4) are partially exposed outside the heat-insulating material (5).
4. The thermal design method for channel heater model selection and temperature field distribution according to claim 1, wherein in step 2, FloEFD thermal simulation software is adopted to perform external analysis on the channel heater to be optimized, and the gravity is set, wherein the gravity acceleration is 9.81m/s2(ii) a The fluid material type, solid material type, wall roughness, fluid onset temperature, and solid onset temperature are selected.
5. The thermal design method for channel heater selection and temperature field distribution of claim 4 wherein said fluid material type is air and water; the solid material types employ platinum and nickel.
6. The thermal design method for channel heater selection and temperature field distribution of claim 4, wherein the three-dimensional model of the channel heater to be optimized is partially grid-encrypted.
7. The thermal design method for channel heater model selection and temperature field distribution as claimed in claim 4, wherein the simulation analysis is to establish a three-dimensional model, set boundary conditions, material properties, ambient temperature and the like in simulation software, then perform grid division, perform simulation calculation on the three-dimensional model with grids, output a structural temperature distribution cloud map, and observe the overall temperature distribution of the structure; and outputting the highest temperature value of the temperature at the junction of the platinum disk and the nickel disk and the magnitude of the radial temperature gradient, and judging whether the standard conditions of the channel heater are met.
8. The thermal design method for channel heater selection and temperature field distribution according to claim 1, wherein in step 3, the standard conditions of the channel heater are that the heating part in the channel heater extends along a radial temperature gradient of less than 3 ℃/mm, and the temperature of the junction between the heating parts in the heater is less than 800 ℃.
9. The thermal design method for channel heater selection and temperature field distribution as claimed in claim 1, wherein in step 3, the simulation result that does not satisfy the condition is re-input with data including material and size of the structure.
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