KR20100100948A - Refractory thickness measuring method, and apparatus therefor - Google Patents

Abstract

The refractory thickness measuring method irradiates the tubular material with radiation, detects attenuated radiation that has passed through the tubular material and the refractory inside the tubular material, and detects the irradiation position surface temperature and attenuated radiation of the surface of the irradiated tubular material. The detection position surface temperature of the surface is detected, the attenuation intensity of the tubular material is removed from the attenuation intensity of the detected attenuation radiation, the attenuation intensity of the refractory is calculated, the refractory thickness is calculated from the refractory attenuation intensity, and the irradiation position surface temperature And the refractory thickness measurement method which calculates irradiation side refractory thickness and detection side refractory thickness from refractory thickness using the detection position surface temperature.

Description

REFRACTORY THICKNESS MEASURING METHOD, AND APPARATUS THEREFOR}

The present invention relates to a method for measuring the refractory thickness and a device thereof, and more particularly to a method and an apparatus for detecting the refractory thickness on the irradiation side and the refractory thickness on the detection side using radiation.

In auxiliary facilities such as blast furnaces and hot blast furnaces in steel mills or chimneys such as sintering and coke ovens, in order to take pig iron out of iron ore, the blast furnace and its auxiliary facilities are exposed to an extremely high temperature atmosphere, and thus the refractory inside the steel shell. Has In addition, since the blast furnace is continuously operated without shutting down after the start of operation, peeling of the refractory cannot be judged from the inside, and nondestructive inspection such as detection using radiation from the outside is performed.

Therefore, in non-destructive inspection, it is an important subject to find the defect part of the refractory material of a tubular material with high precision, and to repair a defect part, to prevent an accident in advance, and to realize the softening of an apparatus.

In addition, as a method of reducing the thickness of the tube material and the deposit thickness using radiation, at least two kinds of radiation sources having different ratios of absorption coefficients of the tube material and the deposit material may be used for the same portion of the tube. The method of irradiating and measuring the intensity of transmitted radiation and calculating the thickness of a pipe | tube and a deposit | attachment from the attenuation amount with respect to each radiation is disclosed (Japanese Patent Application Laid-open No. 63-210707).

Moreover, as a method of calculating the refractory thickness of a tubular material using muon which is a spacecraft, the method of calculating the thickness of a refractory material from the attenuation amount with respect to a spacecraft is disclosed (Japanese Patent Application Laid-open No. Hei 8-263741).

However, in the proposed method, radiation and spacecraft attenuation used in the measurement occur in both the shell and the refractory on the irradiation side, and the shell and the refractory on the detection side, but the thickness of the refractory on the irradiation side and the refractory on the detection side. There was a problem such that each of the thicknesses cannot be discriminated.

In view of the above problems, an object of the present invention is to irradiate the refractory on the inside of the tubular material and to calculate each of the refractory thickness on the radiation side and the refractory thickness on the radiation detection side.

In order to solve the said subject, the refractory thickness measuring method irradiates a tubular material with radiation, detects the attenuation radiation which passed the refractory material inside a tubular material and a tubular material, and irradiated position surface temperature of the surface of the irradiated tubular material, and The detection position surface temperature of the surface of the tube material for which the attenuated radiation has been detected is detected, the attenuation intensity of the tubular material is removed from the attenuation intensity of the detected attenuation radiation, the attenuation strength of the refractory is calculated, and the refractory thickness is determined from the attenuation strength of the refractory. Is calculated and the irradiation side refractory thickness and detection side refractory thickness are calculated from the refractory thickness using irradiation position surface temperature and detection position surface temperature.

The attenuation intensity of the tubular material can be calculated based on the thickness of the tubular material detected by the ultrasonic measurement. The irradiation position of the irradiation and the detection position of the attenuated radiation may be the same position in the horizontal direction.

Moreover, in order to solve the said subject, the refractory thickness measuring method which concerns on this invention irradiates a tubular material, detects the 1st attenuated radiation which passed the refractory of a tubular material and the inside of a tubular material, and irradiates a radiation The position or the detection position for detecting the radiation is changed, the radiation is irradiated to the tubular material to detect the second attenuated radiation that has passed through the tubing material and the refractory inside the tubular material, and the attenuation intensity of the first attenuated radiation By comparing the attenuation intensities of the two attenuated radiations, an abnormality in the refractory thickness is determined.

Moreover, in order to solve the said subject, the radiation irradiation part which irradiates a radiation material to a tubular material, the radiation detection part which detects the radiation which attenuated through the refractory material inside a tubular material and a tubular material, and the irradiation of the surface of the tubular material irradiated with radiation Detection of the surface of the tube material having detected the position surface temperature and the attenuated radiation Temperature detector for detecting the position surface temperature, and the thickness of the tube material and the refractory material is calculated from the attenuation intensity, and the tube material and the refractory thickness are calculated. The refractory thickness is calculated by subtracting the thickness, and using the irradiation position surface temperature and the detection position surface temperature, the calculation processing unit calculates the irradiation side refractory thickness and the detection side refractory thickness from the refractory thickness.

The attenuation intensity of the tubular material can be calculated based on the thickness of the tubular material detected by the ultrasonic measurement. The radiation irradiator and the radiation detector may be the same position in the horizontal direction.

Moreover, in order to solve the said subject, the radiation irradiation part which irradiates a tubular material with the refractory thickness measuring device radiation, and the tubular material which detects the first attenuation radiation which passed the refractory inside a tubular material and a tubular material, and irradiates a radiation By comparing the radiation detection unit for detecting the second attenuation radiation with the attenuation intensity of the first attenuation radiation and the second attenuation radiation attenuation intensity by changing the surface of the tube material or changing the surface of the tube material detecting the attenuation radiation, It has a discriminating part which discriminates the abnormal part of refractory thickness.

In addition, you may calculate the damping intensity of a tubular material based on the thickness of the tubular material detected by the ultrasonic measurement.

According to the present invention, in the measurement of the thickness of the refractory material using radiation, the measured refractory thickness can be calculated by the surface temperature of the shell, so that the refractory thickness on the irradiation side and the refractory thickness on the detection side of the radiation can be calculated. It can be found that the refractory thickness of the portion is reduced.

Further, according to the present invention, by comparing the attenuation intensity of the detected radiation with the attenuation intensity of the radiation detected using another detection unit or irradiation unit, it is possible to find out which part of the refractory thickness in the tubular material is reduced.

The present invention will be described below with reference to the accompanying drawings.

1 is a top view showing an example of a refractory thickness measuring apparatus.
2 is a side view showing an example of a refractory thickness measuring apparatus.
It is a figure which shows an example of the detail of a measuring apparatus.
It is a figure explaining an example of the processing flow of refractory thickness measurement by a refractory thickness measuring apparatus.
5 is a diagram illustrating the attenuation intensity of the attenuated radiation detected by the radiation detector.
6 is a diagram illustrating a relationship between damping strength and refractory thickness.
It is a figure explaining an example of the processing flow of refractory thickness measurement by a refractory thickness measuring apparatus.
8 is a diagram illustrating a relationship between the irradiation position and the detection position.
9 is a graph showing the radiation intensity of attenuated radiation.
FIG. 10 is a diagram illustrating attenuated radiation in which the attenuated radiation shown in FIG. 9 is removed from noise. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

1 is a top view showing an example of a refractory thickness measuring apparatus. The sintered chimney 1 which is a blast furnace installation is a furnace which melts iron ore and manufactures pig iron, and is a cylindrical container or tubing material in which the refractory 5 was applied inside the thick steel shell 3. The measuring apparatus 10 is installed in the sintering chimney 1 and further includes a radiation irradiator 11 for irradiating the radiation indicated by the arrow 7, the inner shell 3a and the inner shell 3a of the irradiation side 50 of the radiation. The radiation detection unit 14 and the input / output unit 15 having a semiconductor detection element for detecting radiation attenuated through the refractory 5a of the radiation, the refractory 5b of the radiation detection side 60 and the shell 3b. Has a computer 16.

The radiation irradiator 11 is connected to a source vessel 12 for storing iridium (Ir-192), which is a radiation source having a high dose rate, and a transmission tube for transmitting radiation such as gamma rays or X-rays from the source vessel 12. The source vessel 12 is connected to the manipulator 13 and the release wire for performing radiation radiation control from the management zone. By operating the opening and closing operation of the shutter of the source vessel 12 by the manipulator 13 from the management zone, the radiation is emitted from the source vessel 12 and the radiation irradiation section 11 provided in the shell 3a of the sintered chimney 1. Radiation is irradiated to the shell 3a, penetrates the sintered chimney 1 as indicated by the arrow 7, and the radiation attenuated by the radiation detector 14 provided in the shell 3b is detected. In addition, the radiation detector 14 detects a voltage generated by the ionizing action of the radiation. In addition, the manipulator 13 may be connected to the input / output unit 15 via a serial cable or the like, and may be communicatively connected to the computer 16 described later through the input / output unit 15. Therefore, the manipulator 13 can be operated by the computer 16. In addition, the radiation detector 14 converts the detected voltage into digital data, and transmits the voltage data to the computer 16 through the input / output unit 15 connected by a serial cable or the like.

2 is a screen diagram showing an example of a refractory thickness measuring apparatus. The sintered chimney 1 is coated with the refractory 5 inside the shell 3. The measuring device 10 is installed in the sintered chimney 1, and includes a radiation irradiator 11 for irradiating the radiation indicated by the arrow 7, and a refractory material inside the shell 3a and the shell 3a on the irradiation side of the radiation ( 5a) and the radiation detection part 14 provided with a semiconductor detection element for detecting the radiation which attenuated through the refractory 5b and the shell 3b of the detection side 60 of radiation.

It is a figure which shows an example of the detail of a measuring apparatus. The measuring device 10 is installed in the sintered chimney 1, and shows radiation represented by an arrow 7 attenuated through the radiation irradiation section 11, the shell 3, and the refractory 5 (not shown) that irradiate radiation. It has the radiation detection part 14 which detects.

The radiation irradiation section 11 may be provided with a temperature detector 36a for measuring the irradiation position surface temperature of the surface of the tube material irradiated with radiation and an ultrasonic measurement section 38a for measuring the thickness of the shell by ultrasonic waves. The radiation irradiation unit 11 has a control unit 31a, stores the temperature data of the shell 3 detected by the temperature detector 36a, and transmits various detection data recorded on the computer 16 by wire or wireless communication. Can be. Moreover, the control part 31a can also record this data to a storage medium, convey a storage medium to the computer 16, and perform data transmission / reception.

The radiation detection unit 14 is provided on the rail 35b so as to be movable, and has a scanner unit 37 including a semiconductor detection element, and the surface of the tube material in which the attenuated radiation is detected around the scanner unit 37. You may provide the temperature detection part 36b which detects the detection position surface temperature. In addition, the radiation detection unit 14 has an ultrasonic measuring unit 38b around the scanner unit 37. In addition, the radiation detector 14 has a control unit 31b, the radiation data detected by the radiation detector 14, the ultrasonic data measured by the ultrasonic measuring unit 38b, and the iron shell 3 detected by the temperature detector 36b. Temperature data is stored and various inspection data stored in the computer 16 are transmitted by wire or wireless communication. Moreover, the control part 31b can also record these data to a storage medium, convey a storage medium to the computer 16, and perform data transmission / reception.

In addition, the temperature detection parts 36a and 36b may detect temperature with the detection element which detects near-infrared rays. In addition, although not shown in figure, the radiation irradiation part 11 may also be provided on the rail 35a so that a movement is possible, and it may be movable.

The ultrasonic measuring units 38a and 38b irradiate the steel bar 3 with the ultrasonic wave, and detect the thickness of the steel bar 3 by the characteristics such as a change in the amount of attenuation of the ultrasonic wave, reflection, absorption, and transfer time difference. In addition, the ultrasonic measuring units 38a and 38b can be mounted by a known ultrasonic thickness meter. In addition, the ultrasonic thickness gauge is based on the time (propagation time) in which ultrasonic waves transmitted from a sensor called a transducer (probe and probe) attached to the shell 3 are reflected back to the opposite side of the measurement object (propagation time). Calculate the thickness of 3).

The temperature detectors 36a and 36b and the ultrasonic wave detectors 38a and 38b can transmit data to the computer 16 via the input / output unit 15 connected by a serial cable or an Ethernet (registered trademark) cable.

In addition, the temperature detectors 36a and 36b and the ultrasonic wave detectors 38a and 38b do not necessarily need to be integrated with the radiation detector 14 or the radiation irradiator 11, and the worker knows the irradiation position and the detection position. By measuring using a portable thermotracer, the respective surface temperatures may be detected and recorded in the input unit 24 or the storage unit 21 of the computer 16.

The computer 16 includes a processing unit 25, a storage unit 21 for recording a program defining various operations of the processing unit 25 and various data, a communication unit 22 for transmitting and receiving data by wired or asynchronous communication, and an input unit ( 24, the display unit 23 is provided.

The computer 16 can obtain the attenuation intensity of the radiation corresponding to the thickness of the steel bar 3 detected by the ultrasonic measuring units 38a and 38b according to Lambert's law shown below (Equation 1).

[Equation 1]

α is the linear weakness coefficient. Where x is the thickness of the shell. I can calculate the intensity of radiation when I ₀ moves the radiation intensity in the shell by a distance x before entering the shell. In other words, when x is known by the ultrasonic measuring unit 18 in advance, the intensity of I after the passage of the steel bar can be calculated. The computer 16 subtracts the attenuation intensity of the bark calculated using Equation 1 from the attenuation intensity of the detected radiation. The attenuation intensity calculated by subtracting in this manner is the attenuation intensity only for the refractory thicknesses on the irradiation side and the detection side.

The computer 16 then calculates the refractory thickness corresponding to the attenuation strength of the refractory thickness from the calibration curve of the radiation attenuation intensity and the refractory thickness (shown in FIG. 6 to be described later).

The computer 16 calculates the irradiation side refractory thickness and the detection side refractory thickness using the calculated refractory thickness using irradiation position surface temperature and detection position surface temperature. In addition, the calculation method uses the following formula assuming that the conductive heat transfer amount of the refractory, the radiation heat transfer amount from the surface of the shell and the convective heat transfer are in an equilibrium state. In addition, the thermal conductivity of the steel bar is ignored because the thermal conductivity is extremely high and the thermal resistance is extremely small. In addition, although the sintered chimney has a cylindrical shape, the pole surface is small enough to require a flat wall model. Therefore, the conductive heat transfer formula of the flat wall is used for the calculation of the conductive heat transfer amount, and the cylindrical conductive heat transfer formula is not used. It was assumed that.

[Equation 2]

[Equation 3]

q1 is the heat amount from the irradiated side shell in an equilibrium state, and is radiative heat transfer and convection heat transfer. In addition, q2 is the amount of heat from the detection bar of the equilibrium state, and radiant heat transfer and convective heat transfer. t0 is the furnace temperature, t1 is the furnace temperature (irradiation side), t2 is the furnace temperature (detection side), b1 is the irradiation side insulation thickness, b2 is the detection side insulation thickness, and ε is the Stephan Boltman coefficient (e.g. If the chimney, about 0.7), λ is the thermal conductivity.

The left side of Equation 2 represents the amount of conduction heat transfer represented by Fourier's law, and the first term on the right side of Equation 2 represents the radiative heat transfer represented by Stefan Boltmann's law, and the second side of Equation 2 represents the amount of convective heat transfer. In addition, hc is used according to the shape. Hc = 2.2 for the vertical wall surface, hc = 2.8 for the upward wall surface, and hc = 1.5 for the downward wall surface. The same applies to Equation 3.

In addition, (lambda) is set to the same value as a detection side and an irradiation side. This is because the horizontal positions of the detection side and the irradiation side are made the same. That is, in general, the thermal conductivity is sometimes changed by a phenomenon such as fluid seeps into the furnace environment and the components in the refractory evaporate. However, in an environment such as a blast furnace or a chimney, the furnace environment is common depending on the height direction. This is because the physical properties of the refractory are considered to be the same when the horizontal positions of are the same. As shown in Fig. 2, refractory materials formed of liquid materials such as concrete and refractory materials that are already solid, such as bricks, are made of the same shape or material in the height direction, so the properties before the change in physical properties are the same. Do. Therefore, when calculating the irradiation side refractory thickness and the detection side refractory thickness using surface temperature, it is preferable that a detection side and an irradiation side are provided in a horizontal position on the assumption that the thermal conductivity is the same in order to improve calculation accuracy. By modifying equations 2 and 3, equations 3 for calculating b1 (irradiation side insulation thickness) and equations 4 for calculating b2 (detection side insulation thickness) can be derived.

[Equation 4]

[Equation 5]

Thus, the computer 16 can calculate b1 (irradiation side insulation thickness) and b2 (detection side insulation thickness) using the formula which assumed the equilibrium state of conduction heat transfer, convection heat transfer, and radiation heat transfer. However, the equations of convective heat transfer and radiant heat transfer, which are the denominators of Equations 4 and 5, are often inconsistent with the results obtained from the relationship between the outside environment (temperature, humidity, air pressure, wind), and surface shape. Therefore, since b1 and b2 calculated in this way have low precision, it is difficult to use it as it is.

On the other hand, measurement by radiation can calculate an accurate value. However, only the total thickness of the irradiation side and the detection side can be calculated. Therefore, in the present Example, the thicknesses b1 and b2 calculated by the expressions 3 and 4 are used for the ratio calculation with respect to the value measured using the radiation.

[Equation 6]

Formula 6 is a formula which shows the ratio obtained from b1 and b2. Using this formula 6 and the thickness L of the radiation measured value, the ratio based on the radiation measured value and the heat transfer calculation can be defined as follows: L1 (irradiation side insulation thickness) and L2 (detection side insulation thickness). .

[Equation 7]

[Equation 8]

In Equations 7 and 8, Equations 4 and 5 having low calculation accuracy are used as ratios for determining the refractory thickness on the irradiation side and the refractory thickness on the detection side. By doing in this way, the refractory thickness by radiation measurement with high calculation precision can be divided into the irradiation side refractory thickness and the detection side refractory thickness. Thus, the measuring apparatus 10 can calculate irradiation side refractory thickness and detection side refractory thickness using irradiation position surface temperature and detection position surface temperature.

The computer 16 can also detect the refractory thickness or determine abnormality in the refractory thickness without using the surface temperature. For example, the measuring device 10 fixes the irradiation position for irradiating the radiation and the detection position for detecting the radiation to detect attenuated radiation that has passed through the tubular material and the refractory inside the tubular material, and then the radiation detector ( By moving 14) in the horizontal direction or the vertical direction, the detection position is changed, or by moving the radiation irradiation section 11 in the horizontal direction or the vertical direction, the irradiation position is changed to detect the second attenuated radiation.

When the difference between the attenuation intensities of the first and second attenuated radiations detected by the computer 16 occurs, the thickness of the refractory corresponding to the difference in the attenuation intensities is calculated, before the detection position change and after the detection position change ( Alternatively, the difference in thickness before the irradiation position change and after the irradiation weaving change can be obtained from the calibration curve of the radiation attenuation intensity and the refractory thickness (shown in FIG. 6 to be described later).

In this way, by changing the detection position or the irradiation position, the difference amount between the radiation intensity and the refractory thickness can be obtained. And when a difference amount is large, it is also possible to distinguish a detection position or an irradiation position as an abnormal point. Moreover, the difference value (ΔL) is made by making the average value of the detected attenuation intensity | strength into the average refractory thickness avL, and making the thickness of the part judged to be normal refractory in the normal state without the difference of a difference value into the average refractory thickness avL. ), It is possible to obtain the refractory thickness by adding or subtracting the difference value to the average refractory thickness avL.

An example of the processing flow of refractory thickness measurement by a refractory thickness measuring apparatus is demonstrated using FIG. First, the radiation is irradiated from the radiation irradiation part 11 to the back surface of the shell 3 of the sintered chimney 1, which is a cylindrical container made of a tubular material (step 101). When the radiation passes through the sintered chimney 1, the radiation is attenuated by the interaction between the steel bar 3a on the irradiation side and the refractory 5a, passes through the interior of the sintered chimney 1, and further, on the detection side bar 3b. ) And attenuation due to the interaction of the refractory 5b. Thus, the radiation detection part 14 detects the attenuation radiation which passed through the shells 3a and 3b and the refractory body 5a and 5b of the sintered chimney 1 which is a cylindrical container which consists of tubular material (step 102). .

5, the attenuation intensity of the attenuation radiation detected by the radiation detector 14 is shown. This attenuation intensity is measured by the radiation detection unit 14 at a position of 180 degrees with respect to the radiation irradiation unit 11 with respect to the sintered chimney having a tube diameter of 6600 mm. The measured data is the attenuation intensity of the radiation detected by the radiation detection unit 14 and the radiation irradiation unit 11 by moving the horizontal position 1 mm to 750 mm by the rail movement.

4, next, the irradiation position surface temperature of the surface of the tube material to which the radiation was irradiated, and the detection position surface temperature of the surface of the tube material which detected the attenuation radiation are detected (step 103). In this step, for example, the temperature detector 36a on the irradiation side and the temperature detector 36b on the detection side measure the temperature by detecting infrared rays emitted from the surface of the sintered chimney to be detected, and the measurement data is input and output. It is stored in the storage unit 21 of the computer 16 via the unit 15. In addition, this step may be measured by a worker using a thermo tracer, and stored in the storage unit 21 of the computer 16 via the input unit 24.

Next, the attenuation intensity of the tubular material is removed from the attenuation intensity of the detected radiation to calculate the attenuation intensity of the refractory (step 104).

In this step, the processing unit 25 of the computer 16 receives the thickness of the shell 3 detected by the ultrasonic measuring unit 18. Next, the processing unit 25 of the computer 16 calculates the attenuation intensity of the radiation in the shell 3 corresponding to the thickness of the received shell 3.

For example, the thickness of the steel bar 3 detected by the ultrasonic measuring unit 18 was 11 mm on the irradiation side, 11 mm on the detection side, and 22 mm in total, the radiation intensity of the radiation was 300 keV, and the line loss coefficient was 0.864. In this case, the processor 25 of the computer 16 can calculate the attenuation strength of the bar 3 by 300 × e (−0.864 × 2.22) = 45 [μSv / s] using the above equation 1. Next, the attenuation intensity of the bark 3 is subtracted from the attenuation intensity of the detected radiation as shown in FIG. By doing in this way, since the damping strength of the steel shell 3 is subtracted from the damping strength by the steel shell and the refractory thickness shown in FIG. 5, the damping strength of a refractory body is calculated.

Next, the refractory thickness is calculated from the attenuation strength of the refractory (step 105).

6 is a diagram illustrating a relationship between damping strength and refractory thickness. As shown in the figure, the refractory thickness can be calculated from the detected attenuation strength by using the relationship between the attenuation strength and the refractory thickness previously determined by the experiment. Therefore, in step 104, the refractory thickness is calculated based on the calibration curve shown in FIG. 6 from the damping strength obtained by subtracting the peeling damping strength.

Next, the irradiation side refractory thickness and detection side refractory thickness are computed using the refractory thickness computed in step 105 using irradiation position surface temperature and detection position surface temperature (step 106). This calculation calculation is calculated by the computer 20 using Equations 7 and 8 as described above. And the process flow of refractory thickness measurement is complete | finished.

Table 1 shown below shows the result of the calculation by the said process flow in the horizontal position area | regions a, b, c, d, and e which are shown in FIG.

TABLE 1

The refractory thicknesses b1 and b2 determined by the heat transfer calculation and the refractory thicknesses L1 and L2 distributed by the heat transfer calculation are not values coincident in the calculation accuracy of the heat transfer calculation as described above. However, by using the refractory thicknesses b1 and b2 calculated | required by electrothermal calculation as a ratio calculation, the refractory thickness L1 and L2 with which calculation precision was improved was able to be calculated.

An example of the processing flow of the refractory thickness measurement by a refractory thickness measuring apparatus is demonstrated using FIG. First, the radiation is radiated from the radiation irradiator 11 onto the surface of the shell 3 of the sintered chimney 1, which is a cylindrical container made of a tubular material (step 201). Attenuated radiation that has passed through the refractory inside the material is detected (step 202).

8 is a diagram illustrating a relationship between the irradiation position and the detection position. In step 201, radiation is first emitted at the irradiation position 50a at a position of 180 degrees with respect to the detection position 60a.

7 again, the irradiation position which irradiates a radiation or the detection position which detects radiation is changed (step 203). This shows that the irradiation position 50a shown in FIG. 8 is changed counterclockwise, for example, 13.1 degree irradiation position 50b, for example, fixing the detection position 60a. In addition, although not shown in FIG. 8, it is also possible to carry out similarly to changing the detection position 60a, fixing the irradiation position 50a.

Next, the radiation is radiated from the radiation irradiator 11 onto the surface of the shell 3 of the cylindrical container sintered chimney 1 which is the same as the sintered chimney which is a cylindrical container made of a tubular material (step 204). The attenuated radiation which passed the refractory inside a tubular material is detected (step 205).

9 is a graph showing the radiation intensity of the detected attenuation radiation. Reference numeral 171 is a graph showing the attenuation intensity of the detected radiation before the irradiation position change, and reference numeral 172 is a graph showing the attenuation intensity of the detected radiation after the irradiation position change. The vertical axis of the graph 171 and the graph 172 represents the chimney height direction, and the horizontal axis is the damping intensity. Since the damping intensity waveform indicated by reference numeral 152a shows a large damping intensity in comparison with other waveforms, it is considered that the refractory thickness is thin at the height and position. However, since the detected radiation intensity is attenuated by the refractory on the irradiation side and the refractory on the detection side, only the graph 171 cannot determine whether the refractory thickness of the irradiation position or the detection position is thin.

Therefore, as shown in the graph 172, when the irradiation position is changed and the radiation intensity is detected and the waveform of 152b having the same height reference is confirmed, it is understood that the attenuation intensity of the radiation is reduced. Therefore, since the damping intensity decreased by changing the irradiation position, it becomes possible to discriminate that the refractory thickness of the irradiation position 50a becomes thin.

And the detected attenuation radiation shown by the graph 171 and the graph 172 is memorize | stored in the memory | storage part 31b of the radiation detection part. Then, the data of the attenuated radiation is stored in the storage unit 21 of the computer 16 by using a recording medium, wireless communication, or the like which is not shown from the storage unit 31b.

7 again, the processing unit of the computer 16 performs a noise removing process on the stored attenuation radiation data (step 206). Since the attenuated radiation data is composed of signals sampled in the vertical direction, noise removal processing is performed by averaging the data values sampled in units of 1 mm in the vertical direction, for example.

Reference numeral 173 shown in FIG. 10 denotes a graph of the attenuated radiation obtained by removing the attenuated radiation shown in the graphs 171 and 172 of FIG. 9. Reference numeral 174 shown in FIG. 10 denotes a graph in which the two attenuated radiations shown in the graph 173 are folded based on the height direction. The attenuation radiation clarified by performing noise removal enables comparison of the data shown in the graph 173 and the graph 174 using the computer 16.

7 again, the attenuation intensities of the two attenuation radiation having different irradiation positions are compared (step 207). By superimposing the waveforms 152a and 152b as indicated by reference numeral 152c in FIG. 10, it becomes clear that the peak portion indicated by 152a does not change the irradiation position. Therefore, it turns out that the damping intensity becomes small at the position of the irradiation position 50a, ie, peeling of a refractory material occurs. In addition, the processing unit 25 of the computer 16 detects the difference ΔL of the attenuation intensities of the two attenuated radiations, and determines that the abnormality in which the refractory peeling occurs occurs because the difference ΔL exceeds a certain threshold. It becomes possible (step 208). In addition, it is possible to evaluate the difference ΔL using the transmitted radiation intensity instead of the attenuation intensity.

In addition, the attenuation intensity of the radiation is detected at many points and stored in the storage unit 21 of the computer 16, and the average value of the plurality of detected attenuation intensities is set as the average refractory thickness avL, without variation of the difference value. By making the thickness of the location judged to be the fireproof sphere in the normal state into the average refractory thickness avL, the refractory thickness can also be calculated | required by adding or calculating a difference value to the average refractory thickness avL by the difference value (DELTA) L. .

In this way, the process flow of refractory thickness measurement is complete | finished.

Although the sintering chimney 1 was described as an example, this invention is not limited to the application to the sintering chimney 1. The present invention is widely applicable to various cylindrical vessels and / or tubular materials that require non-destructive testing of, for example, blast furnaces, piping materials having refractory applied on the inside, heating furnaces, and the like. In addition, although the refractory material was described as an example, it is widely applicable to the material applied inside to various pipe | tube materials which need inspection in a non-destructive test, such as a heat insulating material and a heat insulating material.

In addition, embodiment described above is only typical and it is clear that combining the component of each embodiment, its deformation | transformation, and a variation are clear to those skilled in the art, and those skilled in the art should follow the principle and Claim of this invention. It is apparent that various modifications of the above-described embodiments can be made without departing from the scope of the invention described.

Claims (8)

Irradiate the tubular material with radiation,
Detects attenuated radiation that has passed through the tubular material and the refractory inside the tubular material,
Detecting the irradiation position surface temperature of the surface of the tube material irradiated with the radiation and the detection position surface temperature of the surface of the tube material detecting the attenuated radiation,
Attenuation intensity of the refractory material is removed from the attenuation intensity of the detected attenuation radiation to calculate the attenuation intensity of the refractory material,
Calculating the refractory thickness from the attenuation strength of the refractory,
The refractory thickness measurement method characterized by calculating the irradiation side refractory thickness and detection side refractory thickness from the said refractory thickness using the said irradiation position surface temperature and the said detection position surface temperature. The method of claim 1, wherein the attenuation intensity of the tubular material is calculated based on the thickness of the tubular material detected by the ultrasonic measurement. The refractory thickness measuring method according to claim 1 or 2, wherein the irradiation position of the irradiation and the detection position of the attenuated radiation are the same position in the horizontal direction. Irradiate the tubular material with radiation,
Detecting first attenuated radiation that has passed through the tubular material and the refractory inside the tubular material,
The irradiation position for irradiating the radiation or the detection position for detecting the radiation is changed,
Irradiate the tubular material with radiation,
Detecting second attenuated radiation that has passed through the tubular material and the refractory inside the tubular material,
The refractory thickness measuring method is characterized by determining the abnormality of the refractory thickness by comparing the transmission intensity or attenuation intensity of the first attenuation radiation with the transmission intensity or attenuation intensity of the second attenuation radiation. A radiation irradiation section for irradiating the tube material with radiation;
A radiation detector for detecting radiation attenuated through the tubular material and the refractory inside the tubular material;
A temperature detector for detecting an irradiation position surface temperature of the surface of the tube material irradiated with the radiation and a detection position surface temperature of the surface of the tube material detecting the attenuated radiation;
The thickness of the tubular material and the refractory is calculated from the damping intensity, and the thickness of the tubular material and the refractory is subtracted from the calculated thickness of the tubular material and the refractory to calculate the refractory thickness, and the irradiation position surface temperature and the detection position surface temperature are calculated. Using an arithmetic processing unit for calculating the irradiation side refractory thickness and the detection side refractory thickness from the refractory thickness, using a refractory thickness measuring apparatus. The measuring device according to claim 5, wherein the attenuation intensity of the tubular material is calculated based on the thickness of the tubular material detected by the ultrasonic measurement. The refractory thickness measuring method of Claim 5 or 6 whose said radiation irradiation part and the said radiation detection part are the same position in a horizontal direction. A radiation irradiation section for irradiating the tube material with radiation;
Detecting first attenuated radiation that has passed through the tubular material and the refractory inside the tubular material, and changing the surface of the tubular material to which the radiation is irradiated, or changing the tubular material surface to detect the attenuated radiation A radiation detector for detecting second attenuated radiation by
The refractory thickness measuring apparatus characterized by having the discrimination part which determines the abnormal part of a refractory thickness by comparing the transmission intensity | strength or attenuation intensity | strength of the said 1st attenuation radiation, and the attenuation intensity | strength of the said 2nd transmission intensity or attenuation radiation.

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