CN1410189A - Accurate measuring method of casted blank surface temperature of continuous casting secondary cold region - Google Patents
Accurate measuring method of casted blank surface temperature of continuous casting secondary cold region Download PDFInfo
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Abstract
本发明涉及一种钢水连铸过程中在二次冷却区间铸坯表面温度准确测定方法。本测温方法由两个部分组成，其一是对铸坯二冷区的单点或多点的连续测取其表面温度的测温方法，其二是对所测的温度数据进行处理找出被测处铸坯的准确温度的方法。本发明提供的连铸二冷区铸坯表面温度准确测定方法通过设于连铸机二冷区的若干测温仪与计算机连接，向计算机同时连续地传输温度数据和计算机将在一个时间间隔中获得的若干温度数据作取其中最大值的处理可以同时连续地反映出二冷区内连铸坯的表面真实的温度，通过该温度，可以有效的调控连铸机的拉坯速度，调整冷却水的流量等参数，提高连铸铸坯的产量和质量。
The invention relates to a method for accurately measuring the surface temperature of a slab in a secondary cooling zone during continuous casting of molten steel. This temperature measurement method consists of two parts, one is to continuously measure the temperature of the surface temperature of the single point or multiple points in the secondary cooling zone of the slab, and the other is to process the measured temperature data to find out The method of measuring the accurate temperature of the slab. The method for accurately measuring the surface temperature of the slab in the secondary cooling zone of continuous casting provided by the present invention is connected with a computer through a number of thermometers located in the secondary cooling zone of the continuous casting machine, and simultaneously and continuously transmits the temperature data to the computer and the computer will be in a time interval. The temperature data obtained by taking the maximum value can simultaneously and continuously reflect the real temperature of the surface of the continuous casting slab in the secondary cooling zone. Through this temperature, the casting speed of the continuous casting machine can be effectively adjusted, and the cooling water can be adjusted. The parameters such as the flow rate can improve the output and quality of the continuous casting slab.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for accurately measuring the surface temperature of a casting blank in a secondary cooling zone in the continuous casting process of molten steel.
Background
At present, the modern steel and iron united enterprise basically adopts the continuous casting process in production, and the secondary cooling control is an important component of the continuous casting process. In the continuous casting process, the heat dissipated by the casting blank in the secondary cooling area (secondary cooling area for short) accounts for 60% of the heat dissipated by the casting blank in the solidification process, and directly influences the yield and quality of the casting blank. The surface temperature of the casting blank is an important parameter for adjusting the flow of cooling water, controlling the blank drawing speed and determining the depth of a liquid cavity. In order to know the running state of the casting blank in the continuous casting process and implement automatic control, the surface temperature of the casting blank at the outlet of the crystallizer, in the vicinity of the fan-shaped section and the straightening point needs to be detected.
In the prior art, the temperature of the continuous casting blank is generally measured by a point measurement method, namely a non-contact type temperature measuring instrument is used for measuring the surface temperature of the casting blank discontinuously at a certain point of a secondary cooling area. The temperature error of the surface of the casting blank measured by the temperature measurement method is very large, and the whole temperature change condition of the casting blank in the secondary cooling area of continuous casting cannot be reflected, and the reason is that:
as is known to all, the temperature of a continuous casting blank in a secondary cooling area is extremely high, a water film and an iron scale are formed on the surface of the casting blank in the cooling process, water vapor can diffuse on the surface of the casting blank, and the water vapor, the water film and the iron scale on the surface of the casting blank and the like make it difficult to accurately measure the surface temperature of the casting blank by using a point measurement method.
In addition, the temperature of the casting blank at each key point in the secondary cooling area is not measured point by point, because the temperature of the casting blank at each point is changed every moment, continuous casting process parameters suitable for the casting blank are difficult to be worked out according to the temperature of each point of the casting blank in the secondary cooling area,
disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for continuously and accurately measuring the surface temperature of a casting blank at the same time in a continuous casting secondary cooling area.
In order to achieve the purpose, the invention adopts the following design scheme:
the temperature measuring method consists of two parts, one is a temperature measuring method for continuously measuring the surface temperature of a casting blank in a secondary cooling area at a single point or multiple points, and the other is a method for processing the measured temperature data to find out the accurate temperature of the casting blank at the measured position. The temperature measuring method comprises the following steps:
A. continuously measuring the temperature through a temperature measuring system and transmitting the measured temperature data to a computer:
a. at the position of the continuous casting machine where the temperature of the casting blank needs to be accurately measured, preferably, a continuous temperature measuring instrument is fixedly arranged on the passing casting blank to continuously measure the temperature of the casting blank in a non-contact way;
b. the temperature measuring instrument transmits signals to a computer, namely, the signal output end of the temperature measuring instrument is connected with a communication port of the computer, so that the temperature signals of the casting blank measured by the temperature measuring instrument are continuously transmitted to the computer.
B. The method for determining the real temperature of the surface of the casting blank comprises the following steps:
a. the computer takes out a plurality of temperature data acquired at one temperature measuring point in a time interval;
b. comparing the plurality of acquired temperature data, and acquiring the maximum temperature data;
c. and outputting the obtained maximum temperature data as a processing result, such as storing the maximum temperature data in a disk file or printing the maximum temperature data out or displaying the maximum temperature data through a display.
The signal output end of the temperature measuring instrument can be connected with the communication port of the computer in a serial or parallel mode.
In order to comprehensively reflect the temperature of the continuous casting billet in the secondary cooling area, the thermometers can be respectively arranged in a crystallizer outlet area, a fan-shaped section, a straightening section and a horizontal section of the continuous casting machine and are all connected with the computer. By means of the temperature measuring system, the surface temperatures of the casting blanks at all points in the two cooling areas can be continuously reflected at the same time. The thermometers can also be arranged in a plurality of transverse directions of the casting blank at the straightening section of the continuous casting machine at certain intervals. The temperature measuring instruments can also be arranged in a crystallizer outlet area, a fan-shaped section area, a straightening section area and a horizontal section area in the longitudinal direction of the continuous casting machine, and a plurality of temperature measuring instruments are arranged in the casting blank transverse direction of the straightening section area at certain intervals. And the temperature data acquired by each temperature measuring instrument is transmitted to the computer, and the computer is used for processing the temperature data acquired by each temperature measuring instrument.
The mechanism for accurately measuring the surface temperature of the casting blank in the secondary cooling area by the temperature measuring method provided by the invention is as follows: in the actual continuous casting process, the surface of the casting blank is often covered by a water film, steam fog, iron scale and the like, the temperature of the surface of the casting blank is measured, the temperature of the water film or the iron scale attached to the surface of the casting blank is likely to be measured, but the covering of the water film, the steam fog or the iron scale on the casting blank is not continuous, and the casting blank passing through within a certain time period is not completely covered within the range of a target point of a thermodetector, so that the real surface temperature of the casting blank is rapidly collected into a computer when the uncovered part of the surface of the casting blank appears in the temperature measuring target point of the thermodetector at a certain moment in the time interval. This is the purpose of the method according to the invention of continuously measuring the temperature at one point of the casting machine by means of a temperature measuring device, i.e. of capturing the instantaneous actual surface temperature of the uncovered surface of the cast strand. Since the temperature of the surface of the cast strand covered by the water film, the steam mist or the iron scale should be lower than the temperature of the surface of the cast strand not covered, the actual temperature of the surface of the cast strand must be the highest temperature value measured in the time interval. Therefore, an algorithm for selecting the maximum value of several measured temperature data as the true surface temperature of the cast slab in a time interval is scientific.
According to the temperature measurement principle, it is critical to set a proper time interval for obtaining the real temperature of the surface of the casting blank, and the proper time interval can be 30 seconds to 5 minutes generally according to the covering condition of the casting blank in the secondary cooling area by a water film and/or steam fog and/or iron scale. Further, preferably in the range of 30 seconds to 2 minutes, the possibility of capturing the true temperature of the uncovered slab surface in such a time interval is high. If the time interval is too small, the uncovered surface of the casting blank may not pass through the target point of the temperature measurement of the temperature measuring instrument, but if the time interval is too long, the temperature measurement efficiency is reduced, and the continuous casting process parameters cannot be adjusted timely through the measurement result.
In addition, other factors affecting accurate temperature measurement include:
the response time of the temperature measuring system is the time for the temperature measuring instrument to measure a temperature and then transmit the temperature to the computer, and the size of the response time has great influence on accurate temperature measurement. The response time of the temperature measuring system is generally required to be 300 milliseconds to 2 seconds.
And the temperature measuring distance is the vertical distance between a temperature measuring head of the temperature measuring instrument and the surface of the continuous casting billet. It may typically be between 0.5 and 5 meters.
The target spot of the temperature measuring instrument is small because the uncovered part on the casting blank is likely to be small, and if the target spot is too large, the target spot is difficult to capture, and the accuracy of the measured temperature is reduced. The target point of the thermometer is preferably no larger than 5 mm in diameter.
In addition, the temperature measuring range of the used temperature measuring instrument is within 600-2000 ℃, and the maximum error is preferably less than 1%.
The method for accurately measuring the surface temperature of the casting blank in the continuous casting secondary cooling area is characterized in that a plurality of thermometers arranged in the continuous casting secondary cooling area are connected with a computer, temperature data are simultaneously and continuously transmitted to the computer, the computer takes the maximum value of the temperature data obtained in a time interval to process, so that the real surface temperature of the casting blank in the secondary cooling area can be simultaneously and continuously reflected, the blank drawing speed of the continuous casting machine can be effectively regulated and controlled through the temperature, and the flow of cooling water is adjusted, so that the yield and the quality of the continuous casting blank are improved.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic view showing a structure in which a temperature measuring instrument is provided in the longitudinal direction of a continuous casting machine and the temperature measuring instrument is connected to a computer
FIG. 2 is a schematic structural view of a thermometer transversely arranged on a continuous casting machine and connected with a computer
Detailed Description
As shown in figure 1, a temperature measuring instrument 2 is respectively arranged in a crystallizer outlet area A, a fan-shaped section area B, a straightening section area C and a horizontal section area D of a continuous casting machine, and the signal output end of the temperature measuring instrument is connected with a communication port of a computer 1 to form a temperature measuring system, so that temperature signals of a casting blank 3 measured by the temperature measuring instrument are continuously transmitted to the computer 1. The temperature measuring instrument 2 is arranged above the casting blank 3, and the distance from the surface of the casting blank is 1 m. The response time of the thermometry system is 400 milliseconds. The target spot of the thermometer was 2 mm in diameter.
The temperature is continuously measured by the temperature measuring system and the measured temperature data is transmitted to the computer. The computer obtains a plurality of temperature data of each temperature measuring point in a time interval for comparison, and the maximum temperature data is obtained; and outputting the obtained maximum temperature data as a processing result, such as storing the maximum temperature data in a disk file or printing the maximum temperature data out or displaying the maximum temperature data through a display. The time interval is 2 minutes.
As shown in fig. 2, the temperature measuring devices 2 may be arranged several, for example four, in the transverse direction of the straightening zone of the slab 3: a ' is provided with a temperature measuring instrument 2 at a position A ' which is less than or equal to 10 mm away from one side edge of the casting blank, a temperature measuring instrument 2 is respectively provided at a middle point C ' of the whole casting blank and a position B ' 1/4 of the casting blank width between A ' and C ', and a fourth temperature measuring instrument is provided at a position D ' which is 1/8 of the casting blank width away from the other edge in the width direction of the casting blank.
The method for measuring the temperature and the method for processing the collected temperature data are as before. The time interval was 4 minutes and the response time was 1 second. The temperature measurement distance is 3 meters.
The thermometers can be arranged on the continuous casting machine in the longitudinal direction as shown in figure 1, and in the transverse direction as shown in figure 2, so that more comprehensive system temperature data of the casting blank can be obtained.
Claims (8)
1. A method for accurately measuring the surface temperature of a casting blank in a continuous casting secondary cooling area is characterized by comprising the following steps: the method comprises the following steps:
a, measuring the temperature of the casting blank by a temperature measuring instrument in a non-contact way,
b the temperature data signal is continuously transmitted to the computer,
c, the computer processes the temperature data according to a specific algorithm to obtain the accurate casting blank temperature.
Wherein,
the temperature measuring instrument is arranged above a casting blank running track of the continuous casting machine;
the signal output end of the temperature measuring instrument is connected with the communication port of the computer, so that the temperature data acquired by the temperature measuring instrument is transmitted to the computer;
the computer processes the temperature data transmitted by the temperature measuring instrument as follows:
a. the computer takes out a plurality of temperature data acquired by the thermodetector in a time interval;
b. comparing a plurality of temperature data acquired by the thermodetector, and acquiring the maximum temperature data;
c. and outputting the obtained maximum temperature data as a processing result.
2. The method for measuring according to claim 1, wherein: the temperature measuring devices are multiple, at least one temperature measuring device is respectively arranged in a crystallizer outlet area, a fan-shaped section area, a straightening section area and a horizontal section area on the continuous casting machine, temperature data collected by each temperature measuring device is transmitted to the computer, and the computer is used for processing the temperature data collected by each temperature measuring device.
3. The assay method according to claim 1 or 2, characterized in that: and a plurality of temperature measuring instruments are arranged on the transverse direction of the casting blank in the straightening section area of the continuous casting machine.
4. The method for measuring according to claim 3, wherein: four temperature measuring instruments are arranged in the transverse direction of a straightening section area of a casting blank of a continuous casting machine: one temperature measuring instrument 2 is arranged at a position which is less than or equal to 10 mm away from one side edge of the casting blank, a temperature measuring instrument is respectively arranged at the middle point C ' of the whole casting blank and the position 1/4 of the casting blank width between A ' and C ', and a fourth temperature measuring instrument is arranged at the position which is 1/8 of the casting blank width away from the other edge of the casting blank in the width direction.
6. The method for measuring according to claim 1, wherein: the time interval is 30 seconds to 5 minutes.
7. The method for measuring according to claim 6, wherein: the time interval is 30 seconds to 2 minutes.
8. The method for measuring according to claim 1, wherein: the corresponding time of temperature measurement of the temperature measuring instrument is 300 milliseconds to 2 seconds.
9. The method for measuring according to claim 1, wherein: the temperature measurement target point of the temperature measuring instrument is not more than 5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01141418 CN1228159C (en) | 2001-09-24 | 2001-09-24 | Accurate measuring method of casted blank surface temperature of continuous casting secondary cold region |
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| CN 01141418 CN1228159C (en) | 2001-09-24 | 2001-09-24 | Accurate measuring method of casted blank surface temperature of continuous casting secondary cold region |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1292859C (en) * | 2004-12-06 | 2007-01-03 | 北京华创精英自动化技术有限公司 | Cooling controller with continuous blank manufacture |
| CN100402190C (en) * | 2005-11-03 | 2008-07-16 | 上海梅山钢铁股份有限公司 | A method and device for monitoring and analyzing the surface target temperature of continuous casting slab |
| CN101347822B (en) * | 2008-09-12 | 2010-06-02 | 攀钢集团研究院有限公司 | Bloom continuous casting online temperature field detection method and secondary cooling water control method |
| CN101162171B (en) * | 2007-11-28 | 2010-06-09 | 重庆大学 | Measuring method of surface temperature of high temperature slab under water mist medium |
| CN101905293A (en) * | 2010-05-31 | 2010-12-08 | 北京科技大学 | Camera Temperature Measurement System and Method for High Temperature Slab in Secondary Cooling Zone of Continuous Casting Machine |
| CN101664793B (en) * | 2009-09-14 | 2011-03-30 | 东北大学 | Online forecasting method of continuously cast bloom real-time temperature field based on infrared thermal imaging |
| US8104954B2 (en) | 2007-10-24 | 2012-01-31 | Northeastern University | Apparatus and method for measuring the surface temperature of continuous casting billet/slab |
| CN102513516A (en) * | 2011-12-20 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Dynamic temperature measurement method for straightening section of continuous casting machine for 400mm thick slabs |
| CN102632213A (en) * | 2011-02-12 | 2012-08-15 | 沈阳鑫君城电子有限公司 | Method for measuring and controlling surface temperature of casting blank and special device thereof |
| CN102847726A (en) * | 2012-09-19 | 2013-01-02 | 南京钢铁股份有限公司 | Wire temperature detection method for water cooling line |
| CN102935496A (en) * | 2012-10-23 | 2013-02-20 | 鞍钢股份有限公司 | Portable continuous casting billet surface temperature measuring device and temperature measuring method |
| CN103347627A (en) * | 2011-02-14 | 2013-10-09 | 新日铁住金株式会社 | Cast slab surface temperature measuring device used in continuous casting machine |
| CN104062030A (en) * | 2014-06-16 | 2014-09-24 | 北京首钢股份有限公司 | Device and method for measuring surface temperature of plate blank online |
| CN116809874A (en) * | 2023-07-03 | 2023-09-29 | 福建三宝钢铁有限公司 | Preparation technology for reducing internal cracks of Q355B slab |
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2001
- 2001-09-24 CN CN 01141418 patent/CN1228159C/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292859C (en) * | 2004-12-06 | 2007-01-03 | 北京华创精英自动化技术有限公司 | Cooling controller with continuous blank manufacture |
| CN100402190C (en) * | 2005-11-03 | 2008-07-16 | 上海梅山钢铁股份有限公司 | A method and device for monitoring and analyzing the surface target temperature of continuous casting slab |
| US8104954B2 (en) | 2007-10-24 | 2012-01-31 | Northeastern University | Apparatus and method for measuring the surface temperature of continuous casting billet/slab |
| CN101162171B (en) * | 2007-11-28 | 2010-06-09 | 重庆大学 | Measuring method of surface temperature of high temperature slab under water mist medium |
| CN101347822B (en) * | 2008-09-12 | 2010-06-02 | 攀钢集团研究院有限公司 | Bloom continuous casting online temperature field detection method and secondary cooling water control method |
| CN101664793B (en) * | 2009-09-14 | 2011-03-30 | 东北大学 | Online forecasting method of continuously cast bloom real-time temperature field based on infrared thermal imaging |
| CN101905293B (en) * | 2010-05-31 | 2012-07-25 | 北京科技大学 | High-temperature slab imaging temperature detecting system in secondary cooling zone of continuous casting machine and temperature detecting method thereof |
| CN101905293A (en) * | 2010-05-31 | 2010-12-08 | 北京科技大学 | Camera Temperature Measurement System and Method for High Temperature Slab in Secondary Cooling Zone of Continuous Casting Machine |
| CN102632213A (en) * | 2011-02-12 | 2012-08-15 | 沈阳鑫君城电子有限公司 | Method for measuring and controlling surface temperature of casting blank and special device thereof |
| CN103347627A (en) * | 2011-02-14 | 2013-10-09 | 新日铁住金株式会社 | Cast slab surface temperature measuring device used in continuous casting machine |
| US8888363B2 (en) | 2011-02-14 | 2014-11-18 | Nippon Steel & Sumitomo Metal Corporation | Cast slab surface temperature measuring device used in continuous casting machine |
| CN103347627B (en) * | 2011-02-14 | 2016-02-10 | 新日铁住金株式会社 | The temperature measuring equipment on the slab surface used in continuous casting machine |
| CN102513516A (en) * | 2011-12-20 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Dynamic temperature measurement method for straightening section of continuous casting machine for 400mm thick slabs |
| CN102847726A (en) * | 2012-09-19 | 2013-01-02 | 南京钢铁股份有限公司 | Wire temperature detection method for water cooling line |
| CN102935496A (en) * | 2012-10-23 | 2013-02-20 | 鞍钢股份有限公司 | Portable continuous casting billet surface temperature measuring device and temperature measuring method |
| CN102935496B (en) * | 2012-10-23 | 2016-03-02 | 鞍钢股份有限公司 | Portable continuous casting billet surface temperature measuring device and temperature measuring method |
| CN104062030A (en) * | 2014-06-16 | 2014-09-24 | 北京首钢股份有限公司 | Device and method for measuring surface temperature of plate blank online |
| CN116809874A (en) * | 2023-07-03 | 2023-09-29 | 福建三宝钢铁有限公司 | Preparation technology for reducing internal cracks of Q355B slab |
| CN116809874B (en) * | 2023-07-03 | 2024-04-12 | 福建三宝钢铁有限公司 | Preparation technology for reducing internal cracks of Q355B slab |
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