CN110715756A - Tube furnace temperature field performance testing device under load condition and performance testing method thereof - Google Patents

Tube furnace temperature field performance testing device under load condition and performance testing method thereof Download PDF

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CN110715756A
CN110715756A CN201911125152.3A CN201911125152A CN110715756A CN 110715756 A CN110715756 A CN 110715756A CN 201911125152 A CN201911125152 A CN 201911125152A CN 110715756 A CN110715756 A CN 110715756A
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furnace
temperature
tube
performance testing
standard
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王喆
余松林
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TIANJIN INSTITUTE OF METROLOGICAL SUPERVISON AND TESTING
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TIANJIN INSTITUTE OF METROLOGICAL SUPERVISON AND TESTING
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/005—Calibration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
    • G01K1/146—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations arrangements for moving thermometers to or from a measuring position
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/002—Calibrated temperature sources, temperature standards therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K15/00—Testing or calibrating of thermometers
    • G01K15/007—Testing

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Abstract

The invention belongs to the field of temperature measurement, and relates to a calibration device for a tubular furnace, in particular to a temperature field performance test device for the tubular furnace under a load condition and a performance test method thereof, wherein the device comprises the tubular furnace to be tested, a furnace tube is arranged in the tubular furnace, a temperature equalizing block is embedded in the furnace tube, a temperature control couple is arranged in the temperature equalizing block, a positioning bracket is arranged in the furnace tube, a plurality of measurement standards are fixed through the positioning bracket, a reference end of each measurement standard is positioned outside an opening of the furnace tube and is connected with one end of a compensation lead, the other end of the compensation lead is connected with one end of a copper lead, and the other end of the copper lead is connected with an electrical measuring device through a multi-point change-over switch; the end part of the compensation lead connected with the reference end of the thermocouple and the reference end of the thermocouple are inserted into a terminal thermostat, and the end part of the compensation lead connected with the copper lead is placed into a glass test tube filled with alcohol and is inserted into a reference end thermostat together.

Description

Tube furnace temperature field performance testing device under load condition and performance testing method thereof
Technical Field
The invention belongs to the field of temperature measurement, relates to a calibration device for a tube furnace, and particularly relates to a tube furnace temperature field performance testing device and a performance testing method thereof under a load condition.
Background
In the field of temperature measurement, a cheap metal thermocouple has a wide measurement range, is the most popular temperature measurement sensor in China, and is a main means for contact temperature measurement of a high-temperature region. It is applied to various fields of petrochemical industry, ferrous metallurgy, machining, finished automobile, aerospace and the like in China, and is also at an important position of national quantity value transmission, and the indication accuracy of the method is directly related to the quality of industrial production and scientific research and the quantity value transmission of an important unit of temperature. Calibrating a cheap metal thermocouple requires the use of a tube furnace (thermocouple verification furnace) as an important corollary to verify, calibrate or detect the thermocouple. Therefore, it is important to calibrate the temperature field distribution for the accuracy and reliability of the indication value of each type of temperature sensor.
The uniform temperature field performance of the traditional temperature field measuring method is measured only under the condition that the tube furnace is unloaded. Such a measurement method is only suitable for production and sales units, but is not suitable for use units (or related metering technical mechanisms), and cannot solve the problem that the influence of the furnace temperature field on the measurement result due to the load condition when the tube furnace is used for detecting and calibrating the thermocouple.
In the uncertainty evaluation of the measurement results of the thermocouples of various types, the expansion uncertainty of the measurement results obtained by applying the tube furnace is generally (0.4-2.5) DEG C, and the standard uncertainty component caused by the nonuniformity of the tube furnace is the largest one of the components, and is generally (0.2-1.0) DEG C. The results measured by the traditional temperature field measuring method cannot be applied to actual use, and technicians used in the method can only take the maximum tolerance as a half-width value object of the evaluation component in the process of analyzing and evaluating the uncertainty. Such a measurement method is neither scientific nor reasonable nor close to actual use conditions. Due to the development of temperature measurement, in order to solve the uniformity of the temperature field of the furnace, the existing tube furnace manufacturers often configure corresponding temperature equalizing devices (such as cup type temperature equalizing blocks and jack type temperature equalizing blocks) for the tube furnace, so that the performance of the temperature field can be improved to a certain extent. This means that the tube furnace cannot be seen peeled off from the uniform mass with which it is arranged.
Therefore, the temperature measuring method of the corresponding tubular furnace temperature field should follow up, and the temperature field performance of the tubular furnace must be combined with the temperature equalizing block, namely, the measurement is carried out under the load state. The invention provides a method for detecting the temperature field of a tubular furnace under a load condition, which solves the problem that the performance of the traditional method for detecting the temperature field of the tubular furnace is disjointed and lagged with the reality.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the positioning support for the tubular furnace temperature field test under the load condition, aims to solve the positioning and moving problems of the tubular furnace temperature field distribution test, enables the position of the measurement standard in the furnace tube to be more accurate and convenient, and installs the corresponding test device through the positioning support and extends out a corresponding calibration method based on the device.
The technical scheme adopted by the invention is as follows:
the utility model provides a tubular furnace temperature field capability test device under load situation, includes the tubular furnace that awaits measuring, be provided with the boiler tube in the tubular furnace, this boiler tube embeds is equipped with the samming piece, installs accuse temperature couple in this samming piece, its characterized in that: a positioning bracket is arranged in the furnace tube, a plurality of measurement standards are fixed through the positioning bracket, a reference end of each measurement standard is positioned outside the opening of the furnace tube and is connected with one end of a compensation lead, the other end of the compensation lead is connected with one end of a copper lead, and the other end of the copper lead is connected with an electrical measuring device through a multi-point change-over switch; the end part of the compensation lead connected with the reference end of the thermocouple and the reference end of the thermocouple are inserted into a terminal thermostat, and the end part of the compensation lead connected with the copper lead is placed into a glass test tube filled with alcohol and is inserted into a reference end thermostat together.
The positioning support comprises an inside positioning disk and an outside positioning disk which are arranged in parallel at intervals, a plurality of groups of jacks are respectively formed in the inside positioning disk and the outside positioning disk, one group of jacks comprises two jacks, the two jacks in the same group are respectively arranged in the inside positioning disk and the outside positioning disk and correspond to the axial positions of the jacks in the same group, and the two jacks in the same group are used for fixing the front end part and the rear end part of a measurement standard; a plurality of moving rods are integrally formed in the end faces of the inner positioning plate and the outer positioning plate on the same side along the vertical direction, the front end parts of the two moving rods penetrate out of the outer positioning plate, and the outer positioning plate can reciprocate outside the moving rods along the axial direction.
Further, in the plurality of moving rods, a scale is formed on an outer surface of at least one of the moving rods in an axial direction thereof.
And a circle of sealing sleeve is integrally arranged in the end face of the outer positioning plate outside the furnace and the end face of the inner positioning plate inside the furnace, and a cylindrical channel is integrally formed in the position, corresponding to the insertion hole, in the sealing sleeve along the axial direction.
The tube furnace temperature field performance testing method applying the tube furnace temperature field performance testing device in the load condition as claimed in any one of claims 1 to 4, characterized in that: the method is suitable for horizontal tubular furnaces, vertical furnaces and annealing furnaces under the load condition within the temperature range of 300-1200 ℃; the length of the furnace body is 280 mm-1000 mm; the inner diameter of the furnace tube is 35-45 mm; the method comprises the following calibration steps:
step 1, checking the appearance dimension specification of the tube furnace, including the length of the furnace body and the diameter of the furnace tube;
step 2, detecting the highest temperature insulation resistance;
step 3, detecting the performance of the furnace temperature field under the load condition;
and 4, processing data.
Further, the step 1 includes appearance inspection and nameplate inspection, wherein the appearance inspection includes the steps of 1.1.1: measuring the distance between the two ports of the furnace body by a ruler or a tape measure by a visual method; step 1.1.2: measuring the inner diameter of the furnace tube by a vernier caliper by a visual method, measuring the inner diameter of the furnace tube three times from different angles, and taking the maximum value as a measurement result;
wherein the nameplate inspection comprises the following steps of 1.2.1: the inspection contents are as follows, a, name b, model c, specification d, factory number e, manufacturing plant f, temperature range g, rated power; step 1.2.2 check and record whether the above contents are complete.
Further, the step 2 comprises: detecting the insulation resistance between a power terminal of the tube furnace and a furnace shell when the tube furnace is at the highest temperature; selecting an insulation resistance tester, wherein the measurement voltage (D.C) is (500 +/-50) V; the method is carried out at the ambient temperature (20 +/-15) DEG C and the relative humidity of not more than 80 percent;
step 2.1: raising the furnace temperature of the tubular furnace to the highest temperature, and keeping the temperature for 30 min;
step 2.2: one end of the insulation resistance tester is connected with a power terminal of the tube furnace, and the other end is connected with the furnace shell. And applying voltage, respectively measuring the insulation resistance between each electrode and the metal sleeve, and recording the insulation resistance indication value at 1 min.
Further, the step 3 includes a step 3.1 preparation process and a step 3.2 detection process, and the preparation process is as follows:
step 3.1.1: the tubular furnace which is newly purchased or is not used for a long time is subjected to furnace drying treatment in advance, and the treatment procedure is carried out according to the use instruction of a manufacturer;
step 3.1.2: measuring the distance between two ports of the furnace body by using a ruler or a tape measure through a visual method, calculating the position of a central point of the tubular furnace, marking the corresponding position of the ruler on the test positioning bracket as a '0' position point by using a pencil, marking a mark from the position point to each 10mm of two ends of the ruler respectively, and marking a coordinate position of-5 to + 5;
step 3.1.3: the temperature equalizing block is positioned in a furnace temperature equalizing field, the positioning support is arranged in a furnace tube and is tightly attached to the temperature equalizing block, the movable external positioning plate is placed at a furnace opening, the ring sealing sleeve is tightly attached to the furnace opening, the jacks of the internal positioning plate and the external positioning plate are axially in one-to-one correspondence, the protection tubes on the measurement standard sleeves are inserted into the corresponding jacks, and the bottoms of the measurement end, the protection tubes and the temperature equalizing block are tightly attached; the number of the jacks in the standard measurement is not less than 5 corresponding to the number of the jacks;
step 3.1.4: after a reference end with a standard measurement is connected with an electric measuring device, the reference end is inserted into a reference end thermostat, the insertion depth is not less than 150mm, and the reference end thermostat is kept at 0 +/-0.1 ℃;
step 3.1.5: selecting detection temperature points, and detecting a plurality of temperature points of one tube furnace successively according to a sequence from low to high;
step 3.1.6: and controlling the furnace temperature to be close to the detection temperature point, wherein the deviation of the furnace temperature from the detection temperature point is not more than +/-5 ℃, and when the preset constant temperature time is reached and the furnace temperature change meets the requirement, the measurement can be started.
Further, the detection process in step 3.2 is as follows:
step 3.2.1: detecting an axial temperature field, moving a measuring end of a measuring standard at each position point between-5 and +5 by moving a positioning bracket, and measuring the thermal electromotive force value of each measuring standard at each position point between-5 and +5 when the furnace temperature is set at a detection temperature point and meets the requirement, wherein the measuring sequence is as follows: -5, -4, -3, -2, -1, 0, +1, +2, +3, +4, +5, and so on, in one cycle, and vice versa; the constant temperature time after the moving measurement standard moves from one detection position point to another position point during measurement is not less than 2 min;
step 3.2.2: and detecting a radial temperature field, and recording corresponding data of different measurement standards at each detection position point.
Further, the data processing of step 4 includes measuring the temperature difference at any point relative to the "0" position point as
Δt(t)io＝[ΔE(t)i-ΔE(t)0]/S(t)Formula 1
In the formula: Δ t(t)ioThe difference, deg.C, of any point even to other criteria with respect to the "0" point;
ΔE(t)i-the arithmetic mean of the difference in the thermal electromotive forces of the other standard pairs at any point with respect to standard 1, μ V;
ΔE(t)0the arithmetic mean of the difference in the thermal electromotive forces of the other standard pairs at the "0" point with respect to standard 1, μ V;
S(t)differential thermoelectric potential values of standard pair-wise test points, platinum and rhodium10-the differential thermoelectromotive force of a platinum thermocouple at 1000 ℃ is 11.54 μ ν/DEG C;
converting the potential value into a temperature value, equation 1 can be written as
Δt(t)io＝Δt(t)i-Δt(t)oFormula 2
In the formula: Δ t(t)i-the arithmetic mean of the temperature differences between the other standard pairs and standard 1 at any point, deg.c;
Δt(t)othe arithmetic mean of the temperature differences between the other standard pairs and standard 1 at the "0" point, C.
The invention has the advantages and positive effects that:
according to the invention, a temperature control couple is arranged in a furnace tube and used for reading the temperature in a hearth, a positioning disc in the furnace is used for embedding a plurality of measurement standards, namely standard couples, so that the potential differences at different radial positions in a temperature field are collected, then the temperature difference at different radial positions can be calculated through the potential difference of the standard couples at the position points of '0', then the axial position of a detection end of the standard couples is adjusted through adjusting the distance between the positioning disc in the furnace and the positioning disc outside the furnace, further the potential differences at different axial positions are collected, and then the temperature difference at different axial positions can be calculated through the potential difference of the standard couples at the position points of '0', so that the temperature test at different radial and axial positions in the temperature field is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the determination of the "0" position point in step 3.1.2;
FIG. 3 is a schematic structural diagram of axial temperature field position detection in step 3.2.1;
fig. 4 is a schematic structural diagram of radial temperature field position detection in step 3.2.2.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A kind of tube furnace temperature field performance test device under the load situation, including a tube furnace 3 to be measured, there are furnace tubes 10 in the said tube furnace, the furnace tube embeds and is equipped with the temperature equalizing block 1, the temperature controlling couple 9 is installed in the temperature equalizing block, the innovation of the invention lies in, as shown in figure 1, install a locating support in the said furnace tube, fix with multiple measurement standards through the locating support, the reference end of each said measurement standard locates outside the opening of furnace tube and links with one end of a compensating wire 5, another end of the compensating wire connects with one end of a copper wire, another end of the copper wire links with an electrical measuring equipment 6 through the multipoint change-over switch 7; the end part of the compensation lead connected with the reference end of the thermocouple and the reference end of the thermocouple are inserted into a terminal thermostat 8, and the end part of the compensation lead connected with the copper lead is placed into a glass test tube filled with alcohol and is inserted into a reference end thermostat together.
In the embodiment, the positioning support comprises an in-furnace positioning disc 2 and an out-furnace positioning disc 4 which are arranged in parallel at intervals, a plurality of groups of jacks are respectively formed in the in-furnace positioning disc and the out-furnace positioning disc, one group of jacks comprises two jacks, the two jacks in the same group are respectively arranged in the in-furnace positioning disc and the out-furnace positioning disc, the axial positions of the jacks correspond to those of the jacks in the same group, and the two jacks in the same group are used for fixing the front end part and the rear end part of a measurement standard; a plurality of moving rods are integrally formed in the end faces of the inner positioning plate and the outer positioning plate on the same side along the vertical direction, the front end parts of the two moving rods penetrate out of the outer positioning plate, and the outer positioning plate can reciprocate outside the moving rods along the axial direction.
In this embodiment, the plurality of moving rods are provided with scales on the outer surface of at least one of the moving rods in the axial direction thereof.
In this embodiment, a circle of sealing sleeve is integrally installed in the end face of the outer positioning plate of the furnace and the end face of the inner positioning plate of the furnace, and a cylindrical channel is integrally formed in the sealing sleeve at a position corresponding to the insertion hole along the axial direction.
The tube furnace temperature field performance testing method applying the tube furnace temperature field performance testing device under the load condition is innovative in that the tube furnace temperature field performance testing method is suitable for horizontal tube furnaces, vertical furnaces and annealing furnaces under the load condition within the temperature range of 300-1200 ℃; the length of the furnace body is 280 mm-1000 mm; the inner diameter of the furnace tube is 35-45 mm; the technical requirements for each type of tube furnace are shown in table 1:
TABLE 1 technical requirements of tube furnace
Figure BDA0002276599290000061
Figure BDA0002276599290000071
The method comprises the following calibration steps:
step 1, checking the appearance dimension specification of the tube furnace, including the length of the furnace body and the diameter of the furnace tube;
in this embodiment, the step 1 includes appearance inspection and nameplate inspection, where the appearance inspection includes the step 1.1.1: measuring the distance between the two ports of the furnace body by a ruler or a tape measure by a visual method; step 1.1.2: measuring the inner diameter of the furnace tube by a vernier caliper by a visual method, measuring the inner diameter of the furnace tube three times from different angles, and taking the maximum value as a measurement result;
wherein the nameplate inspection comprises the following steps of 1.2.1: the inspection contents are as follows, a, name b, model c, specification d, factory number e, manufacturing plant f, temperature range g, rated power; step 1.2.2 check and record whether the above contents are complete.
Step 2, detecting the highest temperature insulation resistance, and selecting different types of tube furnaces according to the table 2; the measurement standards and supporting equipment required for testing the tube furnace are shown in table 3;
TABLE 2 highest temperature insulation resistance detection temperature
TABLE 3 measurement standards and supporting equipment
Figure BDA0002276599290000082
In this embodiment, the step 2 includes: detecting the insulation resistance between a power terminal of the tube furnace and a furnace shell when the tube furnace is at the highest temperature; selecting an insulation resistance tester, wherein the measurement voltage (D.C) is (500 +/-50) V; the method is carried out at the ambient temperature (20 +/-15) DEG C and the relative humidity of not more than 80 percent;
step 2.1: raising the furnace temperature of the tubular furnace to the highest temperature, and keeping the temperature for 30 min;
step 2.2: one end of the insulation resistance tester is connected with a power terminal of the tube furnace, and the other end is connected with the furnace shell. And applying voltage, respectively measuring the insulation resistance between each electrode and the metal sleeve, and recording the insulation resistance indication value at 1 min.
Step 3, detecting the performance of the furnace temperature field under the load condition;
further, the step 3 includes a step 3.1 preparation process and a step 3.2 detection process, and the preparation process is as follows:
step 3.1.1: the tubular furnace which is newly purchased or is not used for a long time is subjected to furnace drying treatment in advance, and the treatment procedure is carried out according to the use instruction of a manufacturer;
step 3.1.2: measuring the distance between two ports of the furnace body by using a ruler or a tape measure through a visual method, calculating the position of a central point of the tubular furnace, marking the corresponding position of the ruler on the test positioning bracket as a '0' position point by using a pencil, marking a mark from the position point to each 10mm of two ends of the ruler respectively, and marking the coordinate positions of-5 to +5 as shown in figure 2;
step 3.1.3: the temperature equalizing block is positioned in a furnace temperature equalizing field, the positioning support is arranged in a furnace tube and is tightly attached to the temperature equalizing block, the movable external positioning plate is placed at a furnace opening, the ring sealing sleeve is tightly attached to the furnace opening, the jacks of the internal positioning plate and the external positioning plate are axially in one-to-one correspondence, the protection tubes on the measurement standard sleeves are inserted into the corresponding jacks, and the bottoms of the measurement end, the protection tubes and the temperature equalizing block are tightly attached; the number of the jacks in the standard measurement is not less than 5 corresponding to the number of the jacks;
step 3.1.4: after a reference end with a standard measurement is connected with an electric measuring device, the reference end is inserted into a reference end thermostat, the insertion depth is not less than 150mm, and the reference end thermostat is kept at 0 +/-0.1 ℃;
step 3.1.5: selecting detection temperature points, and detecting a plurality of temperature points of one tube furnace successively according to a sequence from low to high, wherein the detection temperature points are shown in table 4;
TABLE 4 temperature point for detecting temperature field performance of tubular furnace
Tube furnace type Detection temperature Point/. degree.C
Tube furnace for cheap metal/armoured thermocouple 1000
Short tube furnace for cheap metal/armoured thermocouple 1000
Annealing furnace 1100
Step 3.1.6: the furnace temperature is controlled to be close to the detection temperature point, the deviation of the furnace temperature from the detection temperature point is not more than +/-5 ℃, and the measurement can be started when the constant temperature time and the furnace temperature change meet the requirements of the table 5.
TABLE 5 requirements for constant temperature time and oven temperature variation before constant measurement
Figure BDA0002276599290000091
In this embodiment, the detection process in step 3.2 is as follows:
step 3.2.1: as shown in fig. 3, for the axial temperature field detection, the measuring end of the measuring standard is moved at-5 to +5 positions by moving the positioning support, when the furnace temperature is set at the detection temperature, and after the furnace temperature meets the requirement, the thermal electromotive force values of the measuring standards at-5 to +5 positions are measured, and the measuring sequence is as follows: -5, -4, -3, -2, -1, 0, +1, +2, +3, +4, +5, and so on, in one cycle, and vice versa; the constant temperature time after the moving measurement standard moves from one detection position point to another position point during measurement is not less than 2 min;
step 3.2.2: for radial temperature field detection, the corresponding data for different measurement standards at each detection location point is recorded, as shown in fig. 4.
Step 4, data processing; further, the data processing of step 4 includes measuring the temperature difference at any point relative to the "0" position point as
Δt(t)io＝[ΔE(t)i-ΔE(t)0]/S(t)(1)
In the formula: Δ t(t)ioThe difference, deg.C, of any point even to other criteria with respect to the "0" point;
ΔE(t)i-the arithmetic mean of the difference in the thermal electromotive forces of the other standard pairs at any point with respect to standard 1, μ V;
ΔE(t)0the arithmetic mean of the difference in the thermal electromotive forces of the other standard pairs at the "0" point with respect to standard 1, μ V;
S(t)differential thermoelectric potential values of standard pair-wise test points, platinum and rhodium10-the differential thermoelectromotive force of a platinum thermocouple at 1000 ℃ is 11.54 μ ν/DEG C;
converting the potential value into a temperature value, equation 1 can be written as
Δt(t)io＝Δt(t)i-Δt(t)o(2)
In the formula: Δ t(t)i-the arithmetic mean of the temperature differences between the other standard pairs and standard 1 at any point, deg.c;
Δt(t)othe arithmetic mean of the temperature differences between the other standard pairs and standard 1 at the "0" point, C.

Claims (10)

1. The utility model provides a tubular furnace temperature field capability test device under load situation, includes the tubular furnace that awaits measuring, be provided with the boiler tube in the tubular furnace, this boiler tube embeds is equipped with the samming piece, installs accuse temperature couple in this samming piece, its characterized in that: a positioning bracket is arranged in the furnace tube, a plurality of measurement standards are fixed through the positioning bracket, a reference end of each measurement standard is positioned outside the opening of the furnace tube and is connected with one end of a compensation lead, the other end of the compensation lead is connected with one end of a copper lead, and the other end of the copper lead is connected with an electrical measuring device through a multi-point change-over switch; the end part of the compensation lead connected with the reference end of the thermocouple and the reference end of the thermocouple are inserted into a terminal thermostat, and the end part of the compensation lead connected with the copper lead is placed into a glass test tube filled with alcohol and is inserted into a reference end thermostat together.
2. The tube furnace temperature field performance testing device of claim 1, wherein the tube furnace temperature field performance testing device comprises: the positioning support comprises an in-furnace positioning disc and an out-furnace positioning disc which are arranged in parallel at intervals, a plurality of groups of jacks are respectively manufactured in the in-furnace positioning disc and the out-furnace positioning disc, one group of jacks comprises two jacks, the two jacks in the same group are respectively arranged in the in-furnace positioning disc and the out-furnace positioning disc and correspond to each other in axial positions, and the two jacks in the same group are used for fixing the front end part and the rear end part of a measurement standard; a plurality of moving rods are integrally formed in the end faces of the inner positioning plate and the outer positioning plate on the same side along the vertical direction, the front end parts of the two moving rods penetrate out of the outer positioning plate, and the outer positioning plate can reciprocate outside the moving rods along the axial direction.
3. The tube furnace temperature field performance testing device of claim 1, wherein the tube furnace temperature field performance testing device comprises: in the plurality of moving rods, scales are formed on the outer side surface of at least one moving rod along the axial direction of the moving rod.
4. The tube furnace temperature field performance testing device of claim 1, wherein the tube furnace temperature field performance testing device comprises: a circle of sealing sleeve is integrally arranged in the end face of the outer positioning plate outside the furnace and the end face of the inner positioning plate inside the furnace, and a cylindrical channel is integrally formed in the position, corresponding to the insertion hole, in the sealing sleeve along the axial direction.
5. The tube furnace temperature field performance testing method applying the tube furnace temperature field performance testing device in the load condition as claimed in any one of claims 1 to 4, characterized in that: the method is suitable for horizontal tubular furnaces, vertical furnaces and annealing furnaces under the load condition within the temperature range of 300-1200 ℃; the length of the furnace body is 280 mm-1000 mm; the inner diameter of the furnace tube is 35-45 mm; the method comprises the following calibration steps:
step 1, checking the appearance dimension specification of the tube furnace, including the length of the furnace body and the diameter of the furnace tube;
step 2, detecting the highest temperature insulation resistance;
step 3, detecting the performance of the furnace temperature field under the load condition;
and 4, processing data.
6. The tube furnace temperature field performance testing method of the tube furnace temperature field performance testing device under the load condition of claim 5, characterized in that: the step 1 comprises appearance inspection and nameplate inspection, wherein the appearance inspection comprises the following steps of 1.1.1: measuring the distance between the two ports of the furnace body by a ruler or a tape measure by a visual method; step 1.1.2: measuring the inner diameter of the furnace tube by a vernier caliper by a visual method, measuring the inner diameter of the furnace tube three times from different angles, and taking the maximum value as a measurement result;
wherein the nameplate inspection comprises the following steps of 1.2.1: the inspection contents are as follows, a, name b, model c, specification d, factory number e, manufacturing plant f, temperature range g, rated power; step 1.2.2 check and record whether the above contents are complete.
7. The tube furnace temperature field performance testing method of the tube furnace temperature field performance testing device under the load condition of claim 5, characterized in that: the step 2 comprises the following steps: detecting the insulation resistance between a power terminal of the tube furnace and a furnace shell when the tube furnace is at the highest temperature; selecting an insulation resistance tester, wherein the measurement voltage (D.C) is (500 +/-50) V; the method is carried out at the ambient temperature (20 +/-15) DEG C and the relative humidity of not more than 80 percent;
step 2.1: raising the furnace temperature of the tubular furnace to the highest temperature, and keeping the temperature for 30 min;
step 2.2: one end of the insulation resistance tester is connected with a power terminal of the tube furnace, and the other end is connected with the furnace shell. And applying voltage, respectively measuring the insulation resistance between each electrode and the metal sleeve, and recording the insulation resistance indication value at 1 min.
8. The tube furnace temperature field performance testing method of the tube furnace temperature field performance testing device under the load condition of claim 5, characterized in that: the step 3 comprises a step 3.1 preparation process and a step 3.2 detection process, wherein the preparation process comprises the following steps:
step 3.1.1: the tubular furnace which is newly purchased or is not used for a long time is subjected to furnace drying treatment in advance, and the treatment procedure is carried out according to the use instruction of a manufacturer;
step 3.1.2: measuring the distance between two ports of the furnace body by using a ruler or a tape measure through a visual method, calculating the position of a central point of the tubular furnace, marking the corresponding position of the ruler on the test positioning bracket as a '0' position point by using a pencil, marking a mark from the position point to each 10mm of two ends of the ruler respectively, and marking a coordinate position of-5 to + 5;
step 3.1.3: the temperature equalizing block is positioned in a furnace temperature equalizing field, the positioning support is arranged in a furnace tube and is tightly attached to the temperature equalizing block, the movable external positioning plate is placed at a furnace opening, the ring sealing sleeve is tightly attached to the furnace opening, the jacks of the internal positioning plate and the external positioning plate are axially in one-to-one correspondence, the protection tubes on the measurement standard sleeves are inserted into the corresponding jacks, and the bottoms of the measurement end, the protection tubes and the temperature equalizing block are tightly attached; the number of the jacks in the standard measurement is not less than 5 corresponding to the number of the jacks;
step 3.1.4: after a reference end with a standard measurement is connected with an electric measuring device, the reference end is inserted into a reference end thermostat, the insertion depth is not less than 150mm, and the reference end thermostat is kept at 0 +/-0.1 ℃;
step 3.1.5: selecting detection temperature points, and detecting a plurality of temperature points of one tube furnace successively according to a sequence from low to high;
step 3.1.6: and controlling the furnace temperature to be close to the detection temperature point, wherein the deviation of the furnace temperature from the detection temperature point is not more than +/-5 ℃, and when the preset constant temperature time is reached and the furnace temperature change meets the requirement, the measurement can be started.
9. The tube furnace temperature field performance testing method of the tube furnace temperature field performance testing device under the load condition of claim 8, characterized in that: the detection procedure described in step 3.2 is as follows:
step 3.2.1: detecting an axial temperature field, moving a measuring end of a measuring standard at each position point between-5 and +5 by moving a positioning bracket, and measuring the thermal electromotive force value of each measuring standard at each position point between-5 and +5 when the furnace temperature is set at a detection temperature point and meets the requirement, wherein the measuring sequence is as follows: -5, -4, -3, -2, -1, 0, +1, +2, +3, +4, +5, and so on, in one cycle, and vice versa; the constant temperature time after the moving measurement standard moves from one detection position point to another position point during measurement is not less than 2 min;
step 3.2.2: and detecting a radial temperature field, and recording corresponding data of different measurement standards at each detection position point.
10. The tube furnace temperature field performance testing method of the tube furnace temperature field performance testing device under the load condition of claim 5, characterized in that: the data processing of step 4 comprises measuring the temperature difference at any point relative to the "0" position point as
Δt(t)io＝[ΔE(t)i-ΔE(t)0]/S(t)Formula 1
In the formula: Δ t(t)ioThe difference, deg.C, of any point even to other criteria with respect to the "0" point;
ΔE(t)i-the arithmetic mean of the difference in the thermal electromotive forces of the other standard pairs at any point with respect to standard 1, μ V;
ΔE(t)0the arithmetic mean of the difference in the thermal electromotive forces of the other standard pairs at the "0" point with respect to standard 1, μ V;
S(t)differential thermoelectric potential values of standard pair-wise test points, platinum and rhodium10-the differential thermoelectromotive force of a platinum thermocouple at 1000 ℃ is 11.54 μ ν/DEG C;
converting the potential value into a temperature value, equation 1 can be written as
Δt(t)io＝Δt(t)i-Δt(t)oFormula 2
In the formula: Δ t(t)i-the arithmetic mean of the temperature differences between the other standard pairs and standard 1 at any point, deg.c;
Δt(t)othe arithmetic mean of the temperature differences between the other standard pairs and standard 1 at the "0" point, C.
CN201911125152.3A 2019-11-18 2019-11-18 Tube furnace temperature field performance testing device under load condition and performance testing method thereof Pending CN110715756A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113108927A (en) * 2021-01-04 2021-07-13 上海市计量测试技术研究院 Temperature calibration device and test method for dry-type thermostat

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113108927A (en) * 2021-01-04 2021-07-13 上海市计量测试技术研究院 Temperature calibration device and test method for dry-type thermostat
CN113108927B (en) * 2021-01-04 2022-12-06 上海市计量测试技术研究院 Temperature calibration device for dry-type thermostat

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