CN206038173U - Device based on high quartz melting furnace temperature is measured to transient state heat transfer theory - Google Patents
Device based on high quartz melting furnace temperature is measured to transient state heat transfer theory Download PDFInfo
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- CN206038173U CN206038173U CN201621023712.6U CN201621023712U CN206038173U CN 206038173 U CN206038173 U CN 206038173U CN 201621023712 U CN201621023712 U CN 201621023712U CN 206038173 U CN206038173 U CN 206038173U
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- melting furnace
- temperature
- quartz
- type thermocouples
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000010453 quartz Substances 0.000 title claims abstract description 59
- 238000002844 melting Methods 0.000 title claims abstract description 42
- 230000008018 melting Effects 0.000 title claims abstract description 42
- 230000001052 transient effect Effects 0.000 title claims abstract description 16
- 238000012546 transfer Methods 0.000 title claims abstract description 13
- 229910052582 BN Inorganic materials 0.000 claims abstract description 9
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910002804 graphite Inorganic materials 0.000 claims description 12
- 239000010439 graphite Substances 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000004364 calculation method Methods 0.000 abstract description 3
- 239000010425 asbestos Substances 0.000 abstract 3
- 229910052895 riebeckite Inorganic materials 0.000 abstract 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 11
- PXXKQOPKNFECSZ-UHFFFAOYSA-N platinum rhodium Chemical compound [Rh].[Pt] PXXKQOPKNFECSZ-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005350 fused silica glass Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model provides a device based on high quartz melting furnace temperature is measured to transient state heat transfer theory arranges three K type thermocouples in quartzy melting furnace, wherein, quartzy melting furnace includes circular shape asbestos shingle, and the last parcel of asbestos shingle has boron nitride layer, the last aerobic magnesium layer of wrapping up of boron nitride layer, three K type thermocouples are located the same horizontal plane of quartzy melting furnace, and are as the criterion with asbestos shingle's axis and distribute in proper order along quartzy melting furnace's direction of radius, three K type thermocouples pass through wire and signal processing device respectively with the computer link, the computer obtains the quartzy temperature of furnace core according to three K type thermocouple measurement's temperature calculation. The utility model discloses a plurality of extreme temperature resistance are about 1200 DEG C K type thermocouple, the inside high temperature of the quartzy melting furnace of indirect measurement, and measurement accuracy is high, with low costs.
Description
Technical Field
The utility model belongs to the technical field of the thermophysical measurement, concretely relates to device based on transient state heat transfer theory measurement high temperature quartz fusion furnace temperature.
Background
In the processing process of the bulk finished quartz, the quartz raw material needs to be heated to a high temperature of 2000 ℃. Generally, the only devices capable of measuring a temperature of 2000 ℃ are radiation thermometers and platinum rhodium thermocouples. Because the fused silica is positioned in the heating equipment and cannot be penetrated by radiation, only one platinum-rhodium thermocouple can be used for measuring the temperature. However, considering that the price of the platinum-rhodium thermocouple is about 3000 yuan/count, and the service life is also shortened sharply at high temperature (each thermocouple can be reused at most 3 times), the cost is not affordable by general industrial enterprises. Therefore, many enterprises choose not to measure the temperature of the quartz raw material, but estimate the heating time and the heating power according to experience, which easily causes energy waste, product quality reduction and other adverse effects.
The traditional method usually adopts worker experience to estimate the temperature of the furnace core, and occasionally a single high-temperature thermocouple is directly inserted into the furnace core. The former method makes it very difficult to control the heating process due to the inaccuracy of empirical estimation, and this method cannot mass-produce high quality quartz products because the quality of the quartz product is directly affected by the heating power and time during the heating process. The price of the high-temperature thermocouple used in the latter is more than 3000 yuan, and the long-time measurement of the high temperature of the furnace core can lead the service life to be reduced sharply, and the high-temperature thermocouple is usually damaged for tens of hours, thus bringing very high production cost and being unbearable for most enterprises.
Disclosure of Invention
The utility model provides a device based on transient state heat transfer theory measurement high temperature quartz melting furnace temperature is about 1200 ℃ K type thermocouple through a plurality of temperature resistant limits, the inside high temperature of indirect measurement quartz melting furnace, and measurement accuracy is high, with low costs.
In order to solve the technical problem, the utility model provides a device for measuring the temperature of a high-temperature quartz melting furnace based on a transient heat transfer theory, wherein three K-type thermocouples are arranged in the quartz melting furnace; the quartz melting furnace comprises a round graphite sleeve, wherein the graphite sleeve is wrapped with a boron nitride layer, and the boron nitride layer is wrapped with a magnesium oxide layer; the three K-type thermocouples are positioned in the same horizontal plane of the quartz melting furnace and are sequentially distributed along the radius direction of the quartz melting furnace by taking the axis of the graphite sleeve as a reference; the three K-type thermocouples are respectively connected with a computer through leads and signal processing equipment; and the computer calculates and obtains the temperature of the furnace core quartz according to the temperatures measured by the three K-type thermocouples.
Further, the horizontal plane of the three K-type thermocouples is 30cm away from the bottom discharge hole of the quartz melting furnace, and the distances between the three K-type thermocouples and the axis of the graphite sleeve are 30cm, 60cm and 100cm in sequence.
Compared with the prior art, the utility model, it is showing the advantage and lies in, the utility model discloses use many K type thermocouples to form temperature measurement system, solve the furnace core temperature through transient heat transfer formula, both avoided artifical experience estimation's inaccuracy, it is more economical than direct single high temperature resistant thermocouple disect insertion furnace core again, reached the compromise of accuracy and economic nature, be fit for the high-quality quartz products of mass production.
Drawings
FIG. 1 is a sectional view of a quartz melting furnace according to the present invention.
Fig. 2 is a distribution diagram of the K-type thermocouples in the present invention.
Fig. 3 is a schematic diagram of the present invention defining the ith cell.
Detailed Description
It is easy to understand, according to the technical solution of the present invention, under the condition of not changing the essential spirit of the present invention, the general technical personnel in the field can imagine the present invention discloses various embodiments of the device for measuring the temperature of the high temperature quartz melting furnace based on the transient heat transfer theory. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be construed as limiting or restricting the technical solutions of the present invention in its entirety or as a limitation of the present invention.
With the attached drawings, the method for measuring the temperature of the high-temperature quartz melting furnace by using the device based on the transient heat transfer theory comprises the following steps:
first, a quartz melting furnace as shown in fig. 1 was set up. The quartz melting furnace comprises a circular graphite sleeve, wherein a cylindrical cavity in the quartz melting furnace is used as a place for melting quartz and a quartz channel, the top opening of the quartz melting furnace is a feeding port for quartz raw materials, the bottom opening of the quartz melting furnace is used as a discharging port for melting quartz, the graphite sleeve is wrapped by a boron nitride layer, and the boron nitride layer is wrapped by a magnesium oxide layer. In the process of building the quartz melting furnace, three K-type thermocouples are respectively arranged according to the positions shown in figure 2. The specific positions of the three K-type thermocouples are as follows: the three K-type thermocouples are positioned in the same horizontal plane, and the distance between the horizontal plane and a discharge hole at the bottom of the quartz melting furnace is 30 cm; the three K-type thermocouples are distributed along the radial direction of the quartz melting furnace by taking the axis of the cylindrical quartz channel as a reference, and the distances from the inside to the outside of the three K-type thermocouples to the axis of the quartz channel are respectively 30cm, 60cm and 100 cm. The three K-type thermocouples are respectively marked as a No. I K-type thermocouple, a No. II K-type thermocouple and a No. III K-type thermocouple from inside to outside. The three K-type thermocouples are respectively connected with a computer through leads and signal processing equipment. In order to ensure the reliability, a plurality of temperature measuring systems consisting of three K-type thermocouples can be arranged along the circumference of the quartz melting furnace as redundant backup according to the method.
Secondly, after the quartz melting furnace starts to operate, a temperature measuring program in the computer is started, and temperature measuring work is started. After the quartz melting furnace is started from a cold state, the temperature of the whole furnace body begins to gradually rise, and the quartz melting furnace is in a transient heat transfer process. At the moment, the temperature measured by the K-type thermocouple is a transient value, and the computer records and settles the transient temperature value in real time to obtain the temperature of quartz at the furnace core in the transient heat transfer process. At this time, in the process of solving the quartz temperature of the furnace core, the temperature of the quartz at the furnace core needs to be solved by using the related solving method of transient heat transfer shown in the formula (1),
in the formula (1), Cp,iIs the specific heat capacity of the i-th unit, piIs the density of the ith cell, ViIs the volume of the ith cell, TiIs the temperature of the ith cell, RiIs the radius of the ith cell, qiThe power of a heating internal heat source of the ith unit, t is time, h is the height of the quartz melting furnace, and lambda is the heat conductivity corresponding to various materials. As shown in FIG. 3, the i-th cell is from the furnace center to the furnace centerThe outer, i.e. the concentric cylindrical structure artificially divided from the axis of the quartz channel to the outside, appears as several concentric rings in plan view, the wall thickness of the cylinder is Δ R, and the radius of the inner circle of the ith cylinder is RiThis structure does not actually exist, but is a region that is manually divided for numerical calculation, see fig. 2. Three K-type thermocouples are respectively distributed in three cylinder walls, and the temperature T measured by the K-type thermocouples can be considered as the wall thickness delta R of the cylinder is smalleriI.e. the temperature T of the cylinder in which it is locatedi. From the formula (1), the temperature T of each K-type thermocouple is showniWhen the curve changing along with the time is known, the curve dT of the change rate of the temperature to the time can be obtainediSince the specific heat capacity, density, volume, radius and other parameters are known fixed values, T can be solved by transforming equation (1) into equation (2)i+1+Ti-1The sum of the temperatures of the two adjacent cylinders inside and outside the cylinder where a certain K-type thermocouple is located is solved. According to the measured temperatures of three K-type thermocouples, three groups of T can be obtainedi+1+Ti-1According to the three groups Ti+1+Ti-1The temperature of each unit, i.e., each cylinder, can be determined. Therefore, the temperature of the quartz at the core can be obtained by the inward estimation. In actual measurement, the solution is automatically completed by a computer program according to the method.
Thirdly, when the heating process lasts for enough time, the temperature readings of the three K-type thermocouples and the furnace core temperature result obtained by calculation are not changed any more, and at the moment, the transient heating process of the melting furnace is considered to be finished, and the steady-state heating process is started. After entering the steady state heating process, the temperature of the quartz at the core can still be indirectly measured. At this time, the temperature of the quartz at the furnace core is calculated by using the method shown in the formula (3),
in the formula (3), R1Is the inner diameter of the graphite sleeve, R2Is the outer diameter of the graphite sleeve, R3Is the outer diameter of the boron nitride layer, R4Is the outer diameter of the magnesium oxide layer, TITemperature, T, measured by type I K thermocoupleIITemperature, T, measured by type II K thermocoupleIIITemperature, R, measured by type III K thermocoupleIIs the distance R between the type I K thermocouple and the axis of the quartz channelIIIs the distance R between the No. II K-type thermocouple and the axis of the quartz channelIIIIs the distance between the type III K thermocouple and the axis of the quartz channel, and lambda is the heat conductivity corresponding to various materials. According to equation (3), except for the core temperature TFurnace coreBesides, other parameters are known quantities, so that the temperature of the furnace core can be solved by directly substituting the known quantities, and steady-state measurement is realized.
Claims (2)
1. A device for measuring the temperature of a high-temperature quartz melting furnace based on a transient heat transfer theory is characterized in that three K-type thermocouples are arranged in the quartz melting furnace; wherein,
the quartz melting furnace comprises a round graphite sleeve, the graphite sleeve is wrapped with a boron nitride layer, and the boron nitride layer is wrapped with a magnesium oxide layer;
the three K-type thermocouples are positioned in the same horizontal plane of the quartz melting furnace and are sequentially distributed along the radius direction of the quartz melting furnace by taking the axis of the graphite sleeve as a reference;
the three K-type thermocouples are respectively connected with a computer through leads and signal processing equipment;
and the computer calculates and obtains the temperature of the furnace core quartz according to the temperatures measured by the three K-type thermocouples.
2. The apparatus for measuring the temperature of the high-temperature quartz melting furnace according to claim 1, wherein three K-type thermocouples are located at a horizontal plane 30cm away from the bottom discharge port of the quartz melting furnace, and the three K-type thermocouples are located at distances of 30cm, 60cm and 100cm from the axis of the graphite sleeve in this order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621023712.6U CN206038173U (en) | 2016-08-31 | 2016-08-31 | Device based on high quartz melting furnace temperature is measured to transient state heat transfer theory |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621023712.6U CN206038173U (en) | 2016-08-31 | 2016-08-31 | Device based on high quartz melting furnace temperature is measured to transient state heat transfer theory |
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| Publication Number | Publication Date |
|---|---|
| CN206038173U true CN206038173U (en) | 2017-03-22 |
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| CN201621023712.6U Expired - Fee Related CN206038173U (en) | 2016-08-31 | 2016-08-31 | Device based on high quartz melting furnace temperature is measured to transient state heat transfer theory |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225943A (en) * | 2016-08-31 | 2016-12-14 | 南京理工大学连云港研究院 | A kind of device and method measuring high quartz melting furnace temperature based on Transient Heat Transfer theory |
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2016
- 2016-08-31 CN CN201621023712.6U patent/CN206038173U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106225943A (en) * | 2016-08-31 | 2016-12-14 | 南京理工大学连云港研究院 | A kind of device and method measuring high quartz melting furnace temperature based on Transient Heat Transfer theory |
| CN106225943B (en) * | 2016-08-31 | 2018-12-14 | 南京理工大学连云港研究院 | A kind of device and method based on Transient Heat Transfer theory measurement high quartz melting furnace temperature |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170322 Termination date: 20170831 |