A continuous temperature measuring device for aluminum electrolytic cell and its manufacturing method

A temperature measuring device, the technology of aluminum electrolytic cell, which is applied in the direction of measuring device, electric device, thermometer using electric/magnetic components directly sensitive to heat, etc. , the influence of the service life of thermocouples, etc., to achieve good thermal shock resistance, electrolyte erosion resistance, and improve current efficiency.

Active Publication Date: 2018-01-02
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN103292924 discloses a rare earth electrolyzer temperature measuring device and a temperature measuring thermocouple. The temperature measuring device is composed of a thermocouple with a protective cover, a PLC and an Omron touch screen. The protective cover is made of graphite material, and the thermocouple passes through the PLC and the Omron touch screen. connected, the PLC collects and records the temperature measurement data through the thermocouple, and checks the actual temperature of the electrolytic cell through the on-site Omron touch screen; although the device can measure the temperature of the electrolyte in the rare earth electrolytic cell in real time online, the graphite material used as the thermocouple protective cover is in the It is easy to oxidize under high temperature conditions, which greatly affects the service life of thermocouples
CN1164919C discloses an immersion thermocouple for measuring the temperature of an aluminum electrolyte. The couple adopts an integral embedded composite tube structure, and is composed of a junction box armored thermocouple, a connecting tube and a composite protection tube, wherein the composite protection tube inner tube It is a ceramic tube, and the outer tube is made of cryolite-resistant iron-based cast alloy protective tube, and the surface of the protective tube needs to be coated with modified materials; the manufacturing process of the thermocouple is complicated, and the iron-based alloy protective tube used is easy to introduce iron, silicon, etc. Impurities, while the thicker protective layer makes the temperature response of the galvanic couple slower

Method used

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  • A continuous temperature measuring device for aluminum electrolytic cell and its manufacturing method
  • A continuous temperature measuring device for aluminum electrolytic cell and its manufacturing method
  • A continuous temperature measuring device for aluminum electrolytic cell and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The structure of continuous temperature measuring device for aluminum electrolytic cell is as follows: figure 1 As shown, it is composed of temperature measuring thermocouple 1, compensation wire 2, single-chip microcomputer 3 and display 4; temperature measuring thermocouple 1 is connected to single-chip microcomputer 3 through compensation wire 2; single-chip microcomputer 3 is connected to display 4;

[0045] Temperature measuring thermocouple 1 is a K-type thermocouple with a structure such as figure 2 As shown, it is composed of a thermal electrode 9, an insulating material 10, a protective sleeve 11 and a junction box 12; the junction box 12 is fixed on the top of the protective sleeve 11; two thermal electrodes 9 are located in the protective sleeve 11, and the top is fixed on the junction box 12, the distance between the positive and negative welding joints 13 of the working ends of the two hot electrodes 9 and the inner wall of the bottom of the protective sle...

Embodiment 2

[0063] The structure of the continuous temperature measuring device of the aluminum electrolytic cell and the structure of the temperature measuring thermocouple are the same as in Example 1; the difference is that the temperature measuring thermocouple 1 is a K-type thermocouple; the distance between the positive and negative electrode welding joints and the bottom inner wall of the protective sleeve is 7mm; The wall thickness of the protective sleeve is 15mm; the composition of the protective sleeve is NiFe 2 o 4 Particles, NiFe 2 o 4 Nano powder and nano binder, respectively 85%, 10% and 5% by mass; NiFe 2 o 4 Particle size 74μm; NiFe 2 o 4 The particle size of nano powder is 65nm; the insulating material is magnesium oxide powder;

[0064] The manufacturing method of the aluminum electrolytic cell continuous temperature measuring device is the same as in Example 1, the difference is that: in step (1), the solid-liquid ratio of the mixed material to deionized water is...

Embodiment 3

[0069] The structure of the continuous temperature measuring device of the aluminum electrolytic cell and the structure of the temperature measuring thermocouple are the same as in Example 1; the difference is that the temperature measuring thermocouple 1 is an S-type thermocouple; the distance between the positive and negative electrode welding joints and the inner wall of the bottom of the protective sleeve is 4 mm; The wall thickness of the protective sleeve is 30mm; the composition of the protective sleeve is NiFe 2 o 4 Particles, NiFe 2 o 4 Nano powder and nano binder, respectively 94%, 5% and 1% by mass; NiFe 2 o 4 Particle size 38μm; NiFe 2 o 4 The particle size of nano powder is 40nm; the insulating material is magnesium oxide powder;

[0070] The manufacturing method of the aluminum electrolytic cell continuous temperature measuring device is the same as in Example 1, the difference is that: in step (1), the solid-to-liquid ratio of the mixed material to deioniz...

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Abstract

A continuous temperature measuring device for an aluminum electrolytic cell and its manufacturing method. The device is composed of a temperature measuring thermocouple, a compensation wire, a single-chip computer and a display; the temperature measuring thermocouple is connected to the single-chip computer through the compensation wire; the single-chip computer is connected to the display; Consists of thermode, insulating material, protective sleeve and junction box. The manufacturing method is as follows: put the working end of the thermal electrode into the protective sleeve, fill the space between the thermal electrode and the protective sleeve with insulating material, fix the cold end of the thermal electrode on the junction box and connect it with the compensation wire; They are respectively connected with the compensation wire and the display; the protective sleeve is prepared by the grouting method. The thermocouple used in the aluminum electrolytic cell continuous temperature measuring device of the present invention has good thermal shock resistance, high thermal conductivity, small thermal expansion, can resist molten salt corrosion at high temperatures, and is resistant to electrolyte erosion. The solid three-phase interface has good corrosion resistance, and can measure the temperature in the electrolytic cell for a long time.

Description

technical field [0001] The invention relates to the technical field of high-temperature melt measurement, in particular to a continuous temperature measuring device for an aluminum electrolytic cell and a manufacturing method thereof. Background technique [0002] Molten salt electrolysis of metal aluminum is carried out in an electrolytic cell, and the raw material used is alumina. Since the melting point of alumina is above 2000°C, it is necessary to use cryolite as a solvent to establish a cryolite-alumina melt electrolyte system, so that the electrolysis process can be carried out between 940°C and 960°C. In the process of electrolysis, carbon material is used as the electrode, direct current is introduced from the anode, and is exported from the cathode after passing through the electrolyte and aluminum liquid layer. Therefore, the industrial aluminum electrolytic cell is always under the influence of factors such as high temperature, strong corrosion and melt erosion c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/04
Inventor 罗洪杰张志刚刘宜汉张晓明曹卓坤吴林丽徐建荣姚广春
Owner NORTHEASTERN UNIV LIAONING
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