System for testing thermal efficiency of iron-chromium-aluminum alloy wire and heating furnace thereof

Abstract

The utility model discloses an iron-chromium-aluminum alloy wire thermal efficiency test system and a heating furnace thereof, and the system comprises a test furnace which is used for placing a spiral iron-chromium-aluminum alloy wire and providing a test environment; the power supply equipment is used for applying a preset current and a preset voltage to the iron-chromium-aluminum alloy wire in the process of testing the thermal efficiency of the iron-chromium-aluminum alloy wire, and the preset voltage is 0-220V alternating current; the temperature measuring equipment is used for recording furnace temperature change data of the test furnace and recording wire temperature change data of the iron-chromium-aluminum alloy wire; the controller is used for acquiring the furnace temperature change data and the wire temperature change data from the temperature measuring equipment so as to determine the heat efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data; and the controller is also used for controlling the working state of the power supply equipment and is electrically connected with the power supply equipment and the temperature measuring equipment. According to the method, the technical problem of low selection reasonability of the iron-chromium-aluminum alloy is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal efficiency testing, and in particular relates to a thermal efficiency testing system for an iron-chromium-aluminum alloy wire and a heating furnace thereof. Background Art

[0002] Iron-chromium-aluminum alloy is mainly used as electric heating element in heating furnace, resistance furnace and diffusion furnace, etc., to transfer heat in the form of radiation heat transfer. Part of the heat flux radiated by the electric heating element is directly projected on the heated metal, and part is projected on the inner surface of the furnace lining and the adjacent electric heating element and the hook supporting the electric heating element.

[0003] During use, the different element ratios of the iron-chromium-aluminum alloy lead to different thermal efficiencies of the iron-chromium-aluminum alloy. If the thermal efficiency of the iron-chromium-aluminum alloy is too low, that is, the radiation capacity of the iron-chromium-aluminum alloy is poor, it will cause the furnace to heat up slowly, increase power consumption, and cause large economic losses. If the thermal efficiency of the iron-chromium-aluminum alloy is too high, the iron-chromium-aluminum alloy will heat up too high in a short period of time, seriously affecting its service life, and even causing the electric heating element material to be scrapped. Therefore, the low rationality of the selection of the iron-chromium-aluminum alloy is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a thermal efficiency testing system of an iron-chromium-aluminum alloy wire and a heating furnace thereof, which solves the technical problem of low rationality in selecting the iron-chromium-aluminum alloy.

[0005] In a first aspect, an embodiment of the present invention provides a thermal efficiency testing system for an iron-chromium-aluminum alloy wire, comprising: a testing furnace for placing a spiral iron-chromium-aluminum alloy wire and providing a testing environment; a power supply device for applying a preset current and a preset voltage to the iron-chromium-aluminum alloy wire during a thermal efficiency test of the iron-chromium-aluminum alloy wire, wherein the preset voltage is 0 to 220 V AC; a temperature measuring device for recording furnace temperature change data of the testing furnace and wire temperature change data of the iron-chromium-aluminum alloy wire; a controller for acquiring the furnace temperature change data and the wire temperature change data from the temperature measuring device to determine the thermal efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data; and a controller for controlling the working state of the power supply device, wherein the controller is electrically connected to the power supply device and the temperature measuring device, respectively.

[0006] In combination with the first aspect of the present invention, in some embodiments, the test furnace includes: refractory materials arranged around the test furnace to enhance the fire resistance of the test furnace.

[0007] In combination with the first aspect of the present invention, in some embodiments, the power supply device includes: a voltage stabilizer for stabilizing the preset voltage applied to the iron-chromium-aluminum alloy wire; a current stabilizer for stabilizing the preset current applied to the iron-chromium-aluminum alloy wire; and a current and voltage regulator for adjusting the magnitude of the preset current and the preset voltage applied to the iron-chromium-aluminum alloy wire.

[0008] In combination with the first aspect of the present invention, in some embodiments, the temperature measuring equipment includes: a thermocouple device, used to record the furnace temperature change data of the test furnace, installed inside the furnace body of the test furnace; a thermometer, used to record the wire temperature change data of the iron-chromium-aluminum alloy wire, installed outside the furnace body of the test furnace, wherein the thermometer performs infrared emission temperature measurement through a small hole on the test furnace.

[0009] In combination with the first aspect of the present invention, in some embodiments, the thermometer includes: a non-contact temperature sensor; a support frame, used to provide support for the non-contact temperature sensor, and installed on the front side of the furnace door of the test furnace.

[0010] In combination with the first aspect of the present invention, in some embodiments, it includes: the controller is used to determine the temperature difference change data between the wire temperature of the iron-chromium-aluminum alloy wire and the preset wire temperature value based on the wire temperature change data; obtain the test time corresponding to the temperature difference in the temperature difference change data being reduced to a preset temperature difference threshold; based on the test time, determine the thermal efficiency.

[0011] In combination with the first aspect of the present invention, in some embodiments, it includes: the controller is used to determine the thermal efficiency based on the furnace temperature change data and the wire temperature change data.

[0012] In combination with the first aspect of the present invention, in some embodiments, it includes: the controller is used to control the temperature measuring equipment to record the furnace temperature of the test furnace and the wire temperature of the iron-chromium-aluminum alloy wire once every preset period to obtain the furnace temperature change data and the wire temperature change data; based on the furnace temperature change data and the wire temperature change data, obtain the temperature difference change data of the furnace temperature and the wire temperature in each preset period; obtain the test time corresponding to the temperature difference decreasing to the preset temperature difference threshold in the temperature difference change data; and determine the thermal efficiency based on the test time.

[0013] In combination with the first aspect of the present invention, in some embodiments, the refractory material includes refractory bricks.

[0014] In a second aspect, an embodiment of the present invention provides a heating furnace, comprising a thermal efficiency testing system for the iron-chromium-aluminum alloy wire as described in any one of the first aspects.

[0015] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0016] The thermal efficiency test system of the iron-chromium-aluminum alloy wire provided by the embodiment of the present invention comprises: a test furnace for placing the spiral iron-chromium-aluminum alloy wire and providing a test environment; a power supply device for applying a preset current and a preset voltage to the iron-chromium-aluminum alloy wire during the thermal efficiency test of the iron-chromium-aluminum alloy wire, wherein the preset voltage is 0-220V AC; a temperature measuring device for recording the furnace temperature change data of the test furnace and the wire temperature change data of the iron-chromium-aluminum alloy wire; a controller for obtaining the furnace temperature change data and the wire temperature change data from the temperature measuring device to determine the thermal efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data; and a controller for controlling the working state of the power supply device, wherein the controller is electrically connected to the power supply device and the temperature measuring device respectively. During the thermal efficiency test of the spiral iron-chromium-aluminum alloy wire, the thermal efficiency of the iron-chromium-aluminum alloy wire is determined at least based on the wire temperature change data, and the thermal efficiency of the iron-chromium-aluminum alloy wire with different element ratios can be obtained. Then, based on the actual needs of the working scene, the iron-chromium-aluminum alloy wire with different element ratios is selected, which can save electric energy to the greatest extent and extend the service life. Therefore, the rationality of selecting Fe-Cr-Aluminum alloy is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of a thermal efficiency testing system for an iron-chromium-aluminum alloy wire according to an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of furnace temperature, wire temperature and temperature difference recorded at different times in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] Figure 1 FIG. 1 is a schematic diagram of a thermal efficiency testing system 10 for an iron-chromium-aluminum alloy wire according to an embodiment of the present invention. Figure 1 As shown, a thermal efficiency testing system 10 of an iron-chromium-aluminum alloy wire provided by an embodiment of the present invention may include: a testing furnace 110, for placing a spiral iron-chromium-aluminum alloy wire and providing a testing environment; a power supply device 120, for applying a preset current and a preset voltage to the iron-chromium-aluminum alloy wire during a thermal efficiency test of the iron-chromium-aluminum alloy wire, wherein the preset voltage is 0-220V AC; a temperature measuring device 130, for recording furnace temperature change data of the testing furnace 110, and recording wire temperature change data of the iron-chromium-aluminum alloy wire; a controller 140, for acquiring furnace temperature change data and wire temperature change data from the temperature measuring device 130, so as to determine the thermal efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data; the controller 140 is also used to control the working state of the power supply device 120, and the controller 140 is electrically connected to the power supply device 120 and the temperature measuring device 130, respectively.

[0023] In some embodiments, the test furnace 110 may include: a refractory material 1110 disposed around the test furnace 110 to improve the fire resistance of the test furnace 110. The refractory material 1110 may be a refractory brick.

[0024] In some embodiments, the power supply device 120 may include: a voltage stabilizer 1210 for stabilizing a preset voltage applied to the iron-chromium-aluminum alloy wire; a current stabilizer 1220 for stabilizing a preset current applied to the iron-chromium-aluminum alloy wire; and a current and voltage regulator 1230 for adjusting the magnitude of a preset current and a preset voltage applied to the iron-chromium-aluminum alloy wire.

[0025] In some embodiments, the temperature measuring equipment 130 may include: a thermocouple device 1310, which is used to record the furnace temperature change data of the test furnace 110 and is installed inside the furnace body of the test furnace 110; a thermometer 1320, which is used to record the wire temperature change data of the iron-chromium-aluminum alloy wire and is installed outside the furnace body of the test furnace 110, wherein the thermometer 1320 performs infrared emission temperature measurement through a small hole on the test furnace 110.

[0026] In some embodiments, the temperature measuring instrument 1320 may include: a non-contact temperature sensor 1320A; and a support frame 1320B, which is used to provide support for the non-contact temperature sensor 1320A and is installed on the front side of the furnace door of the testing furnace 110 .

[0027] It is understandable that the controller 140 determines the thermal efficiency of the Fe-Cr-Al alloy wire based at least on the wire temperature variation data. There are multiple implementations, which are described below by way of example:

[0028] Implementation method 1:

[0029] The controller 140 is used to determine the temperature difference change data between the wire temperature of the iron-chromium-aluminum alloy wire and the preset wire temperature value based on the wire temperature change data; obtain the test time corresponding to the temperature difference decreasing to the preset temperature difference threshold in the temperature difference change data; and determine the thermal efficiency based on the test time.

[0030] It should be noted that the wire temperature preset value refers to a higher temperature value that the iron-chromium-aluminum alloy wire is expected to reach, and the wire temperature preset value is used to determine whether the temperature of the iron-chromium-aluminum alloy wire increases to the expected temperature. The temperature difference change data includes the temperature difference at different times, and the temperature difference refers to the temperature difference between the wire temperature of the iron-chromium-aluminum alloy wire and the wire temperature preset value. The temperature difference is reduced to the preset temperature difference threshold value, which means that the temperature of the iron-chromium-aluminum alloy wire has increased to the expected temperature. In some embodiments, the thermal efficiency is determined based on the test duration, which can be: the reciprocal of the test duration is used as the thermal efficiency. The shorter the test duration, the higher the thermal efficiency. The preset temperature difference threshold value can be 0.1°C, 1°C, 10°C or 110°C. Implementation method 1 can determine the thermal efficiency of the iron-chromium-aluminum alloy wire only based on the wire temperature change data, avoids combining with other data to determine the thermal efficiency of the iron-chromium-aluminum alloy wire, reduces the acquisition of test data, reduces the test complexity, and reduces the hardware requirements. Therefore, the convenience of testing is improved.

[0031] Implementation method 2:

[0032] The controller 140 is used to determine the thermal efficiency based on the furnace temperature change data and the wire temperature change data.

[0033] Specifically, the controller 140 is used to control the temperature measuring device 130 to record the furnace temperature of the test furnace 110 and the wire temperature of the iron-chromium-aluminum alloy wire once every preset period to obtain furnace temperature change data and wire temperature change data; the controller 140 is used to obtain the temperature difference change data of the furnace temperature and the wire temperature in each preset period based on the furnace temperature change data and the wire temperature change data; obtain the test time corresponding to the temperature difference decreasing to the preset temperature difference threshold in the temperature difference change data; and determine the thermal efficiency based on the test time.

[0034] It should be noted that the temperature difference change data includes the temperature difference at different times, which is the temperature difference between the wire temperature and the furnace temperature. Figure 2As shown, the furnace temperature, wire temperature and temperature difference recorded at different times. The temperature difference is reduced to the preset temperature difference threshold value, which means that the furnace temperature and the wire temperature are close enough due to the heat transfer of the iron-chromium-aluminum alloy wire. In some embodiments, the thermal efficiency is determined based on the test duration, which can be: taking the reciprocal of the test duration as the thermal efficiency. It should be noted that the preset period can be a duration of less than 1 hour, such as 1 second, 1 minute, 5 minutes or half an hour, etc. The preset temperature difference threshold value can be 0.1°C, 1°C, 10°C or 110°C. Implementation method two determines the thermal efficiency based on the furnace temperature change data and the wire temperature change data, which not only includes the wire temperature change data, but also the furnace temperature change data, so that the acquired thermal efficiency is more accurate and the credibility of the test is improved.

[0035] It should be noted that the test data can refer to Table 1, wherein the steel type of the iron-chromium-aluminum alloy wire is A-1, the test start time is 9:40, the resistance of the iron-chromium-aluminum alloy wire is 4Ω, and the resistivity of the iron-chromium-aluminum alloy wire is 1.45 ohm·m.

[0036] Table 1:

[0037]

[0038]

[0039] It should be noted that in order to provide users with more targeted references when using, the radiation heat transfer effect of the electric heating element can be better combined with the use requirements, and energy consumption can be saved to the maximum extent, and the surface load of the material under different use conditions is determined. Generally, the higher the surface load of the material, the more heat is radiated, but if the surface load is too high, the working conditions will deteriorate and the life will be reduced. The thermal efficiency test method of iron-chromium-aluminum alloy is designed to simulate the use conditions, and the heat transfer efficiency of typical materials is tested. Among them, the surface load refers to the power radiated per unit surface area of ​​the electric heating body. The test temperature of the embodiment of the present invention is not more than 2000℃. The iron-chromium-aluminum alloy wire can be a spiral with an inner diameter of 13mm, and the sample is fixed with bolts at both ends. The furnace temperature reaches the furnace wire temperature to complete the test. If the furnace door is opened by mistake during the test and affects the furnace temperature, the test ends early. At the end of the test, the power supply should be adjusted to the off state. If you need to continue measuring the next group of samples, you need to turn on the power switch after the new samples are installed.

[0040] The thermal efficiency testing system 10 of the iron-chromium-aluminum alloy wire provided in the embodiment of the present invention includes: a test furnace 110, which is used to place the spiral iron-chromium-aluminum alloy wire and provide a test environment; a power supply device 120, which is used to apply a preset current and a preset voltage to the iron-chromium-aluminum alloy wire during the thermal efficiency test of the iron-chromium-aluminum alloy wire, and the preset voltage is 0-220V AC; a temperature measuring device 130, which is used to record the furnace temperature change data of the test furnace 110 and the wire temperature change data of the iron-chromium-aluminum alloy wire; a controller 140, which is used to obtain the furnace temperature change data and the wire temperature change data from the temperature measuring device 130, so as to determine the thermal efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data; and is also used to control the working state of the power supply device 120, and the controller 140 is electrically connected to the power supply device 120 and the temperature measuring device 130 respectively. In the process of testing the thermal efficiency of the spiral iron-chromium-aluminum alloy wire, at least based on the wire temperature change data, the thermal efficiency of the iron-chromium-aluminum alloy wire can be determined, and the thermal efficiency of the iron-chromium-aluminum alloy wire with different element ratios can be obtained. Then, based on the actual needs of the working scene, the iron-chromium-aluminum alloy wire with different element ratios can be selected to save electricity and extend the service life to the greatest extent. Therefore, the rationality of the selection of the iron-chromium-aluminum alloy is improved.

[0041] Based on the same inventive concept, an embodiment of the present invention provides a heating furnace, including a thermal efficiency testing system 10 of an iron-chromium-aluminum alloy wire according to any one of the above embodiments.

[0042] It should be understood that more implementation details of the heating furnace in the embodiment of the present invention refer to the thermal efficiency testing system 10 of the iron-chromium-aluminum alloy wire described above, and for the sake of brevity of the specification, they are not repeated here.

[0043] Based on the same inventive concept, an embodiment of the present invention provides a method for testing the thermal efficiency of an iron-chromium-aluminum alloy wire, which is applied to a thermal efficiency testing system 10 and a heating furnace for the iron-chromium-aluminum alloy wire. The method comprises: in the process of testing the thermal efficiency of the iron-chromium-aluminum alloy wire, applying a preset current and a preset voltage to the iron-chromium-aluminum alloy wire, wherein the preset voltage is 0 to 220 V AC; recording the furnace temperature change data of the test furnace 110, and recording the wire temperature change data of the iron-chromium-aluminum alloy wire; and determining the thermal efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data.

[0044] It can be understood that the thermal efficiency testing method of the iron-chromium-aluminum alloy wire may also include: obtaining the current test voltage and the current test current of the iron-chromium-aluminum alloy wire; determining the current test power of the iron-chromium-aluminum alloy wire based on the current test voltage and the current test current; and estimating the service life of the iron-chromium-aluminum alloy wire based on the current test power, wherein if the current test power is greater than a preset power threshold within a preset time period, the service life of the iron-chromium-aluminum alloy wire will be greatly reduced.

[0045] It should be noted that, to determine the current test power of the iron-chromium-aluminum alloy wire according to the current test voltage and the current test current, the product of the current test voltage and the current test current may be used as the current test power of the iron-chromium-aluminum alloy wire.

[0046] It should be understood that more implementation details of the thermal efficiency testing method of the iron-chromium-aluminum alloy wire in the embodiment of the present invention refer to the thermal efficiency testing system 10 of the iron-chromium-aluminum alloy wire described above, and for the sake of brevity of the specification, they are not repeated here.

[0047] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A thermal efficiency test system for iron-chromium-aluminum alloy wire, characterized in that: include: A test furnace, used to place the spiral iron-chromium-aluminum alloy wire and provide a test environment; A power supply device, used for applying a preset current and a preset voltage to the iron-chromium-aluminum alloy wire during a thermal efficiency test of the iron-chromium-aluminum alloy wire, wherein the preset voltage is 0 to 220 V AC; A temperature measuring device, used to record the furnace temperature change data of the test furnace and the wire temperature change data of the iron-chromium-aluminum alloy wire; A controller is used to obtain the furnace temperature change data and the wire temperature change data from the temperature measuring device to determine the thermal efficiency of the iron-chromium-aluminum alloy wire at least based on the wire temperature change data; and is also used to control the working state of the power supply device. The controller is electrically connected to the power supply device and the temperature measuring device, respectively.

2. The thermal efficiency testing system of Fe-Cr-Al alloy wire according to claim 1, characterized in that: The test furnace comprises: Refractory materials are arranged around the test furnace to improve the fire resistance of the test furnace.

3. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 1, characterized in that: The power supply device comprises: A voltage stabilizer, used to stabilize the preset voltage applied to the iron-chromium-aluminum alloy wire; A current stabilizer, used for stabilizing the preset current applied to the iron-chromium-aluminum alloy wire; A current and voltage regulator is used to adjust the magnitude of the preset current and the preset voltage applied to the iron-chromium-aluminum alloy wire.

4. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 1, characterized in that: The temperature measuring device comprises: A thermocouple device, used for recording the furnace temperature change data of the test furnace, installed inside the furnace body of the test furnace; A thermometer is used to record the wire temperature change data of the iron-chromium-aluminum alloy wire and is installed outside the furnace body of the test furnace, wherein the thermometer performs infrared emission temperature measurement through a small hole on the test furnace.

5. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 4, characterized in that: The thermometer comprises: Non-contact temperature sensor; The support frame is used to provide support for the non-contact temperature sensor and is installed on the front side of the furnace door of the test furnace.

6. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 1, characterized in that: include: The controller is used to determine the temperature difference change data between the wire temperature of the iron-chromium-aluminum alloy wire and the preset wire temperature value based on the wire temperature change data; The test time length corresponding to when the temperature difference in the temperature difference change data decreases to a preset temperature difference threshold value is obtained; and the thermal efficiency is determined based on the test time length.

7. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 1, characterized in that: include: The controller is used to determine the thermal efficiency based on the furnace temperature change data and the wire temperature change data.

8. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 7, characterized in that: include: The controller is used to control the temperature measuring device to record the furnace temperature of the test furnace and the wire temperature of the iron-chromium-aluminum alloy wire once every preset period to obtain the furnace temperature change data and the wire temperature change data; to obtain the temperature difference change data of the furnace temperature and the wire temperature in each preset period based on the furnace temperature change data and the wire temperature change data; to obtain the test time corresponding to the temperature difference decreasing to a preset temperature difference threshold value in the temperature difference change data; and to determine the thermal efficiency based on the test time.

9. The thermal efficiency testing system of the Fe-Cr-Al alloy wire according to claim 2, characterized in that: include: The refractory material includes refractory bricks.

10. A heating furnace, characterized in that: A thermal efficiency testing system comprising the iron-chromium-aluminum alloy wire according to any one of claims 1-9.

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