阅读说明：本技术 基于有效发射率校正的钢包温度场测量方法 (Ladle temperature field measuring method based on effective emissivity correction ) 是由 刘军 黄艳辉 于 2021-07-30 设计创作，主要内容包括：本发明公开了基于有效发射率校正的钢包温度场测量方法,包括以下步骤步骤S1：激光器发出的激光束经过激光稳功率系统后形成稳定性优于0.05％的激光,所述激光经过调制后,分别由硅陷阱探测器和高温辐射计接收；步骤S2：数值处理器采集硅陷阱探测器的电压输出值和高温辐射计的输出功率值；步骤S3：分析系统比对硅陷阱探测器的电压输出值和高温辐射计的输出功率值,得到硅陷阱探测器光谱响应度。(The invention discloses a ladle temperature field measuring method based on effective emissivity correction, which comprises the following steps of S1: laser beams emitted by the laser form laser with the stability superior to 0.05% after passing through a laser power stabilizing system, and the laser is modulated and then is received by a silicon trap detector and a high-temperature radiometer respectively; step S2: the numerical processor collects the voltage output value of the silicon trap detector and the output power value of the high-temperature radiometer; step S3: and comparing the voltage output value of the silicon trap detector with the output power value of the high-temperature radiometer by the analysis system to obtain the spectral responsivity of the silicon trap detector.)

1. The ladle temperature field measuring method based on effective emissivity correction comprises the following steps:

step S1: laser beams emitted by the laser form laser with the stability of 0.05% after passing through a laser power stabilizing system, and the laser is modulated and then received by a silicon trap detector and a high-temperature radiometer respectively;

step S2: the numerical processor collects the voltage output value of the silicon trap detector and the output power value of the high-temperature radiometer;

step S3: and comparing the voltage output value of the silicon trap detector with the output power value of the high-temperature radiometer by the analysis system to obtain the spectral responsivity of the silicon trap detector.

2. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 1, wherein: the steel ladle radiation amount measuring device comprises a steel ladle, a focusing lens, a filtering radiometer, a numerical processor and an analysis system; the spectral radiant flux emitted by the steel ladle enters the filtering radiometer after passing through the focusing lens, the photosensitive surface of the detector of the filtering radiometer is positioned on the image surface of the focusing lens, the output signal of the filtering radiometer is collected by the numerical processor, and the effective emissivity of the steel ladle is calculated by the analysis system.

3. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 1, wherein: the laser is transmitted using an optical fiber in step S1, and noise is filtered in the ultrasonic bath.

4. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 1, wherein: in step S2, the analysis system compares the detection signal values of the filter radiometer and the pyroelectric detector, and obtains the response value of the filter radiometer at the remaining wavelengths by comparison and interpolation, thereby obtaining the absolute spectral responsivity of the filter radiometer.

5. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 1, wherein: the spectral radiant flux emitted by the steel ladle enters the filtering radiometer after passing through the focusing lens, the photosensitive surface of the detector of the filtering radiometer is positioned on the image surface of the focusing lens, the output signal of the filtering radiometer is collected by the numerical processor, and the effective emissivity of the steel ladle is calculated by the analysis system.

6. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 1, wherein: the laser power stabilizing system comprises a first polaroid, an electro-optic crystal, a second polaroid, a microscope objective, a first iris diaphragm, a collimating objective, a second iris diaphragm, a wedge-shaped beam splitter, a monitoring detector and a servo amplification system.

7. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 6, wherein: the laser beam entering the laser stable power system is polarized by the first polaroid, and then passes through the electro-optic crystal and the second polaroid, so that the laser is linearly polarized with an electric vector vertical to the table top.

8. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 7, wherein: a pinhole diffraction light spot is generated by the focusing of the microscope objective lens and passing through the first iris diaphragm, the light beam is collimated by the collimating objective lens, and the center bright ring of diffraction is selected by the second iris diaphragm.

9. The ladle temperature field measurement method based on effective emissivity correction as claimed in claim 8, wherein: a part of laser is provided to a monitoring detector as a monitoring beam through a wedge-shaped beam splitter, an output signal of the monitoring detector is used as a reference signal of a servo amplification system, and the servo amplification system drives an electro-optic crystal, so that the transmittance of the electro-optic crystal is changed, and the effect of stabilizing power is achieved.

Technical Field

The invention relates to the field of ferrous metallurgy, in particular to a ladle temperature field measuring method based on effective emissivity correction.

Background

In continuous casting production, a steel ladle is an intermediate container for connecting steel making and pouring links, and the temperature of the steel ladle container is an important parameter influencing the tapping temperature, the quality and the service life of steel ladle refractory. If the temperature of the steel ladle is too low, the temperature difference between the high-temperature molten steel and the inner wall of the steel ladle is too large, the tapping quality is directly influenced, even a safety production accident is caused, if the temperature of the steel ladle is too high, the energy waste of steel making can be caused, and meanwhile, the service life of the steel ladle is shortened. The accurate control of the steel-making superheat degree can be realized by accurately acquiring the temperature of the inner wall of the steel ladle, so that the aims of ensuring the steel-making quality, realizing safe production and saving the cost can be fulfilled.

At present, a monochromatic infrared point measurement method is generally adopted for measuring the temperature of the inner wall of the steel ladle in the ferrous metallurgy field, but the surface emissivity of the material of the inner wall of the steel ladle is difficult to determine, so that the temperature of the inner wall of the steel ladle cannot be accurately obtained. The interior of the ladle container is of a truncated cone-shaped cavity structure, and a theoretical calculation method is usually adopted for determining the effective emissivity of a certain point on the surface of the interior of the cavity. The effective emissivity formula of the isothermal cavity is derived by the method of integration, such as the chuangning method, and the formula is used as an estimation basis of the effective emissivity of the cavity, but the calculation is complex. Therefore, the method for measuring the ladle temperature field based on effective emissivity correction is provided, and the monitoring effect on the surface temperature of the ladle is improved.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides the ladle temperature field measuring method based on effective emissivity correction.

In order to achieve the purpose, the invention adopts the technical scheme that: the ladle temperature field measuring method based on effective emissivity correction comprises the following steps: step S1: laser beams emitted by the laser form laser with the stability superior to 0.01% after passing through a laser power stabilizing system, and the laser is modulated and then received by a silicon trap detector and a high-temperature radiometer respectively; step S2: the numerical processor collects the voltage output value of the silicon trap detector and the output power value of the high-temperature radiometer; step S3: and comparing the voltage output value of the silicon trap detector with the output power value of the high-temperature radiometer by the analysis system to obtain the spectral responsivity of the silicon trap detector.

In a preferred embodiment of the invention, the steel ladle radiation measuring device comprises a steel ladle, a focusing lens, a filtering radiometer, a numerical processor and an analysis system; the spectral radiant flux emitted by the steel ladle enters the filtering radiometer after passing through the focusing lens, the photosensitive surface of the detector of the filtering radiometer is positioned on the image surface of the focusing lens, the output signal of the filtering radiometer is collected by the numerical processor, and the effective emissivity of the steel ladle is calculated by the analysis system.

In a preferred embodiment of the present invention, the laser in step S1 is transmitted through an optical fiber, and noise is filtered in the ultrasonic bath.

In a preferred embodiment of the present invention, in step S2, the analysis system compares the detection signal values of the filter radiometer and the pyroelectric detector, and obtains the response value of the filter radiometer at the remaining wavelengths through comparison and interpolation, thereby obtaining the absolute spectral responsivity of the filter radiometer.

In a preferred embodiment of the invention, spectral radiant flux emitted by the steel ladle enters the filtering radiometer after passing through the focusing lens, a photosensitive surface of a detector of the filtering radiometer is positioned on an image surface of the focusing lens, and an output signal of the filtering radiometer is collected by the numerical processor and is calculated by the analysis system to obtain the effective emissivity of the steel ladle.

In a preferred embodiment of the invention, the laser power stabilizing system comprises a first polaroid, an electro-optic crystal, a second polaroid, a microscope objective, a first iris diaphragm, a collimating objective, a second iris diaphragm, a wedge-shaped beam splitter, a monitoring detector and a servo amplification system.

In a preferred embodiment of the invention, a laser beam entering the laser stabilized power system is polarized by the first polarizer, and then passes through the electro-optical crystal and the second polarizer, so that the laser is linearly polarized with an electric vector vertical to the table top.

In a preferred embodiment of the invention, a pinhole diffraction spot is generated by focusing with a microscope objective lens and passing through a first iris diaphragm, the light beam is collimated with a collimator objective lens, and a center bright ring of diffraction is selected by a second iris diaphragm.

In a preferred embodiment of the invention, a part of laser is provided to a monitoring detector as a monitoring beam through a wedge-shaped beam splitter, an output signal of the monitoring detector is used as a reference signal of a servo amplification system, and the servo amplification system drives an electro-optical crystal, so that the transmittance of the electro-optical crystal is changed, and the effect of stabilizing the power is achieved.

The invention solves the defects in the background technology, and has the following beneficial effects:

the method comprises the steps of firstly calibrating a silicon trap detector by using a high-temperature radiometer, then forming a relatively stable uniform laser beam by combining a tunable laser light source, a laser stable power controller and an integrating sphere, after the uniform laser beam is collimated by a collimating lens, respectively receiving and measuring the uniform laser beam by using a filtering radiometer, the silicon trap detector and a pyroelectric detector, calibrating absolute responsivity of the filtering radiometer under a specific wavelength by using a radiation comparison method, then accurately measuring spectral radiant flux of a steel ladle in a temperature plateau section by using the calibrated filtering radiometer, wherein the temperature of the steel ladle working in the temperature plateau section is a fixed value, and calculating the emissivity of the steel ladle by using the measured radiant flux and the temperature of the steel ladle. Thereby realizing the measurement of the effective emissivity of the ladle. The method solves the problem of measuring the effective emissivity of the steel ladle at present, and has the characteristics of high measuring accuracy and wide application prospect.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Reference in the specification to "an embodiment," "one embodiment," "some embodiments," or "other embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments. The various appearances of "an embodiment," "one embodiment," or "some embodiments" are not necessarily all referring to the same embodiments.

The method for measuring the temperature of the steel ladle tests the steel ladle in circulation in a certain steel plant, and utilizes a rotary platform executing mechanism to drive an infrared temperature measuring sensor to scan the inner wall surface of the steel ladle to obtain infrared measurement temperature values of points of the intersection line of the longitudinal section of the steel ladle passing through the central axis of the steel ladle and the inner wall of the steel ladle on the premise of determining that the distance from a baffle plate of the steel ladle to the steel ladle opening is 1600mm and the emissivity of the material of the inner wall of the steel ladle is 0.85, and then corrects the emissivity of infrared temperature measurement through the analysis result of the effective emissivity of the points of the inner wall, thereby obtaining the real temperature of the inner wall of the steel ladle.

The ladle temperature field measuring method based on effective emissivity correction comprises the following steps: step S1: laser beams emitted by the laser form laser with the stability superior to 0.01% after passing through a laser power stabilizing system, and the laser is modulated and then received by a silicon trap detector and a high-temperature radiometer respectively; step S2: the numerical processor collects the voltage output value of the silicon trap detector and the output power value of the high-temperature radiometer; step S3: and comparing the voltage output value of the silicon trap detector with the output power value of the high-temperature radiometer by the analysis system to obtain the spectral responsivity of the silicon trap detector.

In a preferred embodiment of the invention, the steel ladle radiation measuring device comprises a steel ladle, a focusing lens, a filtering radiometer, a numerical processor and an analysis system; the spectral radiant flux emitted by the steel ladle enters the filtering radiometer after passing through the focusing lens, the photosensitive surface of the detector of the filtering radiometer is positioned on the image surface of the focusing lens, the output signal of the filtering radiometer is collected by the numerical processor, and the effective emissivity of the steel ladle is calculated by the analysis system.

In a preferred embodiment of the present invention, the laser in step S1 is transmitted through an optical fiber, and noise is filtered in the ultrasonic bath.

In a preferred embodiment of the present invention, in step S2, the analysis system compares the detection signal values of the filter radiometer and the pyroelectric detector, and obtains the response value of the filter radiometer at the remaining wavelengths through comparison and interpolation, thereby obtaining the absolute spectral responsivity of the filter radiometer.

In a preferred embodiment of the invention, spectral radiant flux emitted by the steel ladle enters the filtering radiometer after passing through the focusing lens, a photosensitive surface of a detector of the filtering radiometer is positioned on an image surface of the focusing lens, and an output signal of the filtering radiometer is collected by the numerical processor and is calculated by the analysis system to obtain the effective emissivity of the steel ladle.

In a preferred embodiment of the invention, the laser power stabilizing system comprises a first polaroid, an electro-optic crystal, a second polaroid, a microscope objective, a first iris diaphragm, a collimating objective, a second iris diaphragm, a wedge-shaped beam splitter, a monitoring detector and a servo amplification system.

In a preferred embodiment of the invention, a laser beam entering the laser stabilized power system is polarized by the first polarizer, and then passes through the electro-optical crystal and the second polarizer, so that the laser is linearly polarized with an electric vector vertical to the table top.

In a preferred embodiment of the invention, a pinhole diffraction spot is generated by focusing with a microscope objective lens and passing through a first iris diaphragm, the light beam is collimated with a collimator objective lens, and a center bright ring of diffraction is selected by a second iris diaphragm.

In a preferred embodiment of the invention, a part of laser is provided to a monitoring detector as a monitoring beam through a wedge-shaped beam splitter, an output signal of the monitoring detector is used as a reference signal of a servo amplification system, and the servo amplification system drives an electro-optical crystal, so that the transmittance of the electro-optical crystal is changed, and the effect of stabilizing the power is achieved.

The method comprises the steps of firstly calibrating a silicon trap detector by using a high-temperature radiometer, then forming a relatively stable uniform laser beam by combining a tunable laser light source, a laser stable power controller and an integrating sphere, after the uniform laser beam is collimated by a collimating lens, respectively receiving and measuring the uniform laser beam by using a filtering radiometer, the silicon trap detector and a pyroelectric detector, calibrating absolute responsivity of the filtering radiometer under a specific wavelength by using a radiation comparison method, then accurately measuring spectral radiant flux of a steel ladle in a temperature plateau section by using the calibrated filtering radiometer, wherein the temperature of the steel ladle working in the temperature plateau section is a fixed value, and calculating the emissivity of the steel ladle by using the measured radiant flux and the temperature of the steel ladle. Thereby realizing the measurement of the effective emissivity of the ladle. The method solves the problem of measuring the effective emissivity of the steel ladle at present, and has the characteristics of high measuring accuracy and wide application prospect.

If the specification states a component, feature, structure, or characteristic "may", "might", or "could" be included, that particular component, feature, structure, or characteristic is not required to be included. If the specification or claim refers to "a" or "an" element, that does not mean there is only one of the element. If the specification or claim refers to "a further" element, that does not preclude there being more than one of the further element.

In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.