Melting liquid temperature continuous measurement method and apparatus

Abstract

The invention discloses a melted liquid temperature continuous measuring method, comprising the steps of: mounting a positioning device on a sensor, a connection pipe of which connected with a temperature measuring pipe. The sensor matches the positioning device; mounting the positioning device on lower side of the liquid level of the melted liquid. A sealed end of the temperature measuring pipe is inserted into a predetermined depth and floated on the measured melted liquid; When the liquid level of the melted liquid fluctuates, the temperature measuring pipe fluctuates along the liquid level; the sensor moves up and down in the positioning device. The depth that the temperature measuring pipe inserted into the melted liquid is not varied; the sealed end of the temperature measuring pipe senses the temperature of the melted liquid and radiates; receiving the radiation sent from the sealed end of the temperature measuring pipe, obtaining temperature of the melted liquid after analysis. The invention further discloses a device implementing the method. The temperature measurement of the invention is low in cost, high in accuracy, which can be applied to temperature continuous measurement of melted liquid such as steel water and so on. The invention discloses a melted liquid temperature continuous measuring method, comprising the steps of: mounting a positioning device on a sensor, a connection pipe of which connected with a temperature measuring pipe. The sensor matches the positioning device; mounting the positioning device on lower side of the liquid level of the melted liquid. A sealed end of the temperature measuring pipe is inserted into a defined depth and floated on the measured melted liquid; When the liquid level of the melted liquid fluctuates, the temperature measuring pipe fluctuates along the liquid level; the sensor moves up and down in the positioning device. The depth that the temperature measuring pipe inserted into the melted liquid is not varied; the sealed end of the temperature measuring pipe senses the temperature of the melted liquid and radiates; receiving the radiation sent from the sealed end of the temperature measuring pipe, obtaining temperature of the melted liquid after analysis. The invention further discloses a device implementing the method. The temperature measurement of the invention is low in cost, high in accuracy, which can be applied to temperature continuous measurement of melted liquid such as steel water and so on.

Description

technical field [0001] The invention relates to the measurement of black body cavity radiation pyrometry, in particular to a method and device for continuously measuring the temperature of molten liquid. Background technique [0002] In industries such as metallurgy and glass production, realizing the continuous measurement of the temperature of molten metal and glass is of great significance to adjust the production process, reduce energy consumption and improve quality. [0003] U.S. Patent US5180228 discloses a method and device for measuring the temperature of molten iron or molten steel, such as figure 1 As shown, the technical solution uses the black body cavity radiation temperature measurement technology, and the specific solution is: the temperature measuring tube 11 with one end open is inserted into molten iron or molten steel 14, the surface of the molten iron or molten steel 14 has floating slag 13, and the upper end of the temperature measuring tube 11 is conne...

AI Technical Summary

Problems solved by technology

The above-mentioned technical scheme realizes the continuous measurement of the temperature of molten iron or molten steel, but it also has the following disadvantages: 1. The structure is complex, and a new part needs to be specially equipped: a ring protector; Radiation temperature measurement, so there is a requirement for the ratio of the depth of the insertion liquid level to the inner diameter of the temperature measurement tube: usually greater than a certain value, and during the entire temperature measurement process, the liquid level is constantly fluctuating, resulting in the insertion depth of the temperature measurement tube It will fluctuate with the fluctuation of the liquid level. However, in the above technical solution, the position of the temperature measuring tube is fixed. Therefore, when the liquid level drops, such as when the ladle is replaced in the steelmaking and continuous casting process, the liquid steel level in the tundish Usually there will be a large drop, and the insertion depth will be insufficient. At this time, the temperature measuring tube cannot be regarded as a blackbody cavity, which will cause a serious drop in temperature measurement accuracy.

[0005] 1. The high cost of the temperature measuring tube is reflected in the following aspects: First, during the temperature measurement process, the position of the temperature measuring tube is fixed, and the length of insertion into the molten metal is limited (the temperature measuring tube only needs to meet the requirements of the black body cavity), and the liquid level The temperature measuring tube above is longer (especially when the liquid level drops), and this part of the temperature measuring tube does not play a role in temperature measurement, which wastes this part of the temperature measuring tube and increases the cost of temperature measurement

Second, in order to meet the requirements of the black body cavity, the ratio of the insertion depth of the temperature measuring tube to the inner diameter must be greater than a certain value, and due to the limitation of the mold (the longer the temperature measuring tube, the longer the inner cavity mold required, In order to ensure the strength of the mold, the diameter of the mold must be larger), the diameter of the inner cavity of this type of temperature measuring tube is usually relatively large, so the insertion depth is also relatively large, resulting in a relatively large total length of the temperature measuring tube

The length of the commonly used temperature measuring tube is about 1100mm. If the cheap aluminum carbon material is used, the weight is 15 kg, and the price of the aluminum carbon material is 30,000 yuan / ton, so the cost of each temperature measuring tube is about 450 yuan. Ceramic temperature measuring tubes are more expensive

Third, there will be a layer of highly corrosive slag on the surface of molten liquid such as molten steel. Therefore, the temperature measuring tube is often broken at the slag line, and the service life is greatly reduced

[0006] 2. It is difficult to process the temperature measuring tube. Since the temperature measuring tube used in the above scheme is long, it is difficult to process a smaller inner diameter in the longer temperature measuring tube, and the requirements for the mold are also high.

[0007] 3. The temperature measurement accuracy is low. Since the black body cavity technology is used for radiation temperature measurement, there is a requirement for the ratio of the depth of the inserted liquid surface to the inner diameter of the temperature measurement tube: usually greater than a certain value, and during the entire temperature measurement process In the method, the liquid level fluctuates continuously, causing the insertion depth of the temperature measuring tube to fluctuate with the fluctuation of the liquid level. However, in the above technical solution, the position of the temperature measuring tube is fixed. Therefore, when the liquid level drops, the insertion depth will fluctuate. Insufficient depth, at this time, the temperature measuring tube cannot be regarded as a black body cavity, resulting in a serious drop in temperature measurement accuracy

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