JPH09318457A - Method and apparatus for measurement of temperature of high-temperature object in fume atmosphere - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the temperature of a high-temperature object continuously and precisely by a method wherein the visual field of an infrared camera directed to the high-temperature object in a fume atmosphere is divided, the light receiving energy of respective divided parts is found and the temperature of the divided parts whose light receiving energy is high is computed and displayed. SOLUTION: An auxiliary electrode is inserted into a furnace near a slug discharge port, and a cover 1 is attached so as to surround the discharge port. A lens tube 22 is passed through the cover 1, and an infrared camera 2 takes a picture of a molten slug A which flows to the visual field and flows down from the slug discharge port. At the lens tube 22, a cooling-water passage is formed at the outside, and a purge gas passage is formed at the inside in order to prevent a lens 21 from being cooled and fume from being stuck to the tip part of the tube 22. The molten slug A is photographed by the infrared camera 2, a circular visual field D in a diameter of about 100mm is set on its image face so as to be divided into mesh shapes in a total of about 100 pieces, the light receiving energy of divided parts is found by a computing device 3 via a light receiving part 24, and only the divided parts whose light receiving energy is high are displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for measuring a high temperature object surface (surface temperature) in a fume atmosphere. In the case of melting and processing metal scrap using a melting furnace, or in the case of melting and processing municipal waste incineration residues using a melting furnace, in order to ensure safe operation of the furnace and to achieve its processing purpose, It is important to continuously and accurately measure the temperature of the melt generated in the fume atmosphere scattered or radiated from metal scrap, municipal waste incineration residue, and the like. The present invention relates to a method and an apparatus capable of continuously and accurately measuring the temperature of a high temperature object in the above-described fume atmosphere.

[0002]

2. Description of the Related Art For example, when melting an incineration residue of municipal solid waste by using a melting furnace, molten slag is produced in the furnace and the molten slag is discharged from a slag discharge port of the furnace. The inside of the furnace is filled with fine fumes scattered or radiated from the incineration residue of municipal waste, and the fumes are also blown out from the slag discharge port of the furnace. In such a fume atmosphere, the temperature of the molten slag cannot be measured by a normal radiation thermometer. Therefore, conventionally, a consumable thermocouple is intermittently inserted into the molten slag generated in the furnace or discharged from the slag discharge port of the furnace, the temperature is intermittently measured, and the temperature of the melting furnace is measured based on this. The reality is that the operating conditions are controlled. However, such a conventional method causes various problems because the temperature of the molten slag can be measured only intermittently. Although the properties and substantive amount of the municipal solid waste incineration residue that is input to the melting furnace are constantly changing, the conventional method that measures the temperature of the molten slag only intermittently is to make the operating conditions of the melting furnace sufficiently follow such fluctuations. Therefore, unmelted matter is discharged from the slag discharge port of the furnace, or the molten slag is congested inside the furnace or at the slag discharge port of the furnace due to insufficient energy input to the melting furnace, and conversely to the melting furnace. There are various problems such as melting and damage of the furnace wall due to excess input energy.

[0003]

The problem to be solved by the present invention is that the conventional method can only intermittently measure the temperature of a high temperature object in a fume atmosphere.

[0004]

SUMMARY OF THE INVENTION The present invention, however, divides the field of view of an infrared camera toward a high temperature object in a fume atmosphere, obtains received light energy for each divided portion, and only the divided portion having high received light energy. The present invention relates to a method for measuring the temperature of a high temperature object in a fume atmosphere, characterized in that the temperature of the object is calculated and displayed. Further, the present invention comprises an infrared camera having a water-cooled and / or gas-cooled lens tube, an arithmetic unit connected to a light receiving unit of the infrared camera, and a temperature display unit connected to the arithmetic unit. , The field of view of the infrared camera directed to a high temperature object in a fume atmosphere is divided, the received light energy is obtained for each divided portion, and the temperature of only the divided portion having a high received energy is calculated and displayed. The present invention relates to an apparatus for measuring a high temperature object temperature in a fume atmosphere.

An infrared camera is used in the measuring method according to the present invention. In a normal camera that is sensitive to visible light in the wavelength range of 0.4 to 0.8 μm, visible light is absorbed or scattered by the fumes around the high-temperature object, so it can identify high-temperature objects. This is because it is not possible, but with an infrared camera having sensitivity to infrared rays having a wavelength range longer than visible light, the infrared rays can be transmitted without being absorbed or scattered by the fumes, so that a high temperature object can be identified.

In the infrared camera, the light receiving element is 1.0 to
Those having high sensitivity in the wavelength region of 2.0 μm (near infrared region) are preferable. Most of the fumes around a high-temperature object as described above have a particle size of 1 μm or less, and usually 12
Electromagnetic waves radiated from a high-temperature object in the temperature range of about 0 to 1600 ° C have a wavelength range of 2.0 μm or less, so electromagnetic waves (near infrared rays) radiated from a high-temperature object are not absorbed by such fumes and are high. This is because light can be received with sensitivity. Further, the infrared camera preferably has a visible light cut filter between the light receiving element and the lens. This is because it is possible to prevent so-called halation caused by a high-temperature arc for melting the metal scrap or melting the municipal waste incineration residue. Furthermore, the infrared camera preferably has a water-cooled and / or gas-cooled lens tube. This is because the lens of the infrared camera can be protected from the high temperature atmosphere.

In the measuring method according to the present invention, the field of view of the infrared camera directed to a high temperature object in a fume atmosphere is divided, the received light energy is obtained for each divided portion, and the temperature of only the divided portion having high received energy is calculated. indicate. For example, a circular visual field with a diameter of about 100 mm is set on the image plane of an infrared camera, and the circular visual field is divided into a total of about 100 meshes, and the received light energy is obtained for each divided portion. The temperature of only the part is calculated and displayed.

As an example of the molten slag discharged from the slag discharge port of the melting furnace when melting municipal waste incineration residue as a high-temperature object in a fume atmosphere, the molten slag at the time of discharge is The downflow position sways left and right and up and down. Further, a part of the molten slag is cooled and solidified, and the solidified product exists so as to sandwich both sides of the molten slag that is flowing or flowing, or partially covers the surface of the molten slag that is flowing or flowing. To do. Even under such circumstances, by setting a certain field of view on the image surface of the infrared camera, it is possible to reliably catch the molten slag whose outflow position or downflow position fluctuates, and to receive light within each division. The temperature of the molten slag itself can be accurately measured by calculating and displaying the temperature of only the section having high energy. And, needless to say, since the molten slag itself is constantly monitored by the infrared camera, the temperature of the molten slag itself can be continuously measured.

When dividing the field of view of the infrared camera toward a high temperature object in a fume atmosphere to obtain the received light energy for each divided portion and calculating and displaying the temperature of only the divided portion having high received energy, each divided portion is calculated. It is preferable to integrate the received light energy for each fixed time to obtain the integrated value, and calculate and display the temperature of only the section where the integrated value is high. It is preferable to continuously calculate and display the temperature of only the section where the received light energy is high.

[0010] As a high-temperature object in a fume atmosphere, in the case where molten slag discharged from a slag discharge port of a melting furnace in the case of melting and treating municipal waste incineration residue is taken as an example, unmelted matter is discharged together with the molten slag. In some cases, the surface of the molten slag captured by the infrared camera may be temporarily covered with the cooled solidified product.
In such a case, if the temperature of a section having a high received energy is simply calculated and displayed among the sections, the calculated and displayed temperature fluctuates greatly temporarily, and eventually the operating conditions of the melting furnace are changed. Confuse control. Even in such a case, the temperature of the molten slag itself can be accurately measured by integrating the received light energy for a certain period of time as described above, or by obtaining the change over time of the received light energy. It can be avoided.

A measuring device according to the present invention includes an infrared camera having a water-cooled or air-cooled lens tube, a calculation device connected to a light receiving part of the infrared camera, and a temperature display part connected to the calculation device. Is equipped with. 1 light receiving part
It has an individual or a plurality of light receiving elements, and the arithmetic unit has an image processing function for dividing the field of view of the infrared camera,
It has an arithmetic processing function of calculating the received light energy for each divided portion, excluding the divided portion having low received energy, and calculating the temperature of only the divided portion having high received energy from the received light energy.

As described above, the light receiving element forming the light receiving portion is preferably a light receiving element having a high sensitivity in the wavelength range of 1.0 to 2.0 μm, for example, a light receiving element made of PbS or Ge. Is preferably one having a function of integrating the received light energy for each divided portion for a certain period of time to obtain the integrated value, or a function of obtaining the temporal change of the received light energy for each divided portion. For the temperature display of the section where the received light energy is high, the temperature may be displayed for each section where the received light energy is high, or the maximum value or the average value of the temperature of the section where the received light energy is high may be displayed. Good.

[0013]

1 is a longitudinal sectional view schematically showing an embodiment of a measuring apparatus according to the present invention. 1 is a cover for a slag outlet not shown, 2 is an infrared camera, 3 is a computing device,
4 is a temperature display part. The infrared camera 2 includes a total of three lenses 21 arranged in series, a water-cooled and air-cooled lens tube 22 surrounding and protecting the lens 21, a casing 23 attached to the lens tube 22, and a casing 2.
3, a visible light cut filter 25 attached between the lens 21 and the light receiving portion 24.

The melting furnace (not shown) comprises a furnace body, a furnace lid attached to the furnace body, and a main electrode inserted into the furnace from the furnace lid, and a slag discharge port is opened at the bottom of the side wall of the furnace body. The auxiliary electrode is inserted in the furnace near the slag discharge port, and the cover 1 is attached so as to surround the slag discharge port. A lens tube 22 is inserted through the cover 1, so that the infrared camera 2 can catch the molten slag flowing out and flowing down from the slag discharge port in its field of view. In this case, the lens tube 22 has a cooling water passage formed on the outside and a purge gas passage formed on the inside. The purge gas cools the lens 21 and fumes adhere to the tip of the lens tube 22. It is designed to prevent you from doing so.

The arithmetic unit 3 includes a light receiving section 2 of the infrared camera 2.
4, the image processing function for dividing the field of view of the infrared camera 2 and the received light energy for each divided portion are excluded, the divided portion with low received energy is excluded, and the temperature of the divided portion with high received energy is excluded. Has a calculation processing function of calculating from the received light energy. The temperature display unit 4 is connected to the arithmetic unit 3 and displays the temperature of the section having a high received light energy calculated as described above.

FIG. 2 is a schematic view showing an embodiment of the measuring method according to the present invention, and FIG. 3 is a partially enlarged view of FIG. Molten slag A produced when the municipal solid waste incineration residue is melted and discharged flows out and flows down from a slag discharge port 11 opened at a lower portion of a side wall of a furnace body of a melting furnace (not shown). An auxiliary electrode 12 is inserted in the furnace near the slag discharge port 11, and cooling solidified products B and C of the molten slag A hang down like an icicle on both sides of the molten slag A during the outflow and the downflow.

When the outflow and downflow conditions of the molten slag A as described above are monitored by using the measuring apparatus as described above with reference to FIG. 1, the infrared scam 2 captures the molten slag A in the middle of the outflow and downflow, and its image plane is displayed. A circular field of view D having a diameter of about 100 mm is set in this area, and this circular field of view D is divided into a total of about 100 meshes as shown in FIG. Of the received energies thus obtained by the arithmetic unit 3, the divided parts with low received energy are excluded, and the divided parts with high received energy (in FIG. 3, molten slag A flowing out and flowing down)
The temperature of only the scoring part corresponding to (1) is calculated and displayed on the temperature display part 4 via the calculation device 3.

When a plurality of light receiving element arrangements are used as the light receiving section 3, the light receiving energy of each dividing section can be calculated for each light receiving element corresponding to each dividing section. When using one light receiving element,
It can be obtained by optically scanning the individual light receiving elements to each of the divisions. For example, in FIG. 3, after scanning each section from the left side to the right side of the first stage,
All the divisions are scanned by the procedure of scanning each division from the right side to the left side of the step, and the received light energy of each division is obtained. The temperature can be displayed as a numerical value or a graph for each section of high received energy, but the temperature of only the section of highest received energy among the sections of high received energy must be displayed. It is also possible to display the average value of each temperature of the section where the received light energy is high.

[0019]

As is apparent from the above, the present invention described above has an effect that the temperature of a high temperature object in a fume atmosphere can be continuously and accurately measured.

[Brief description of drawings]

FIG. 1 is a vertical sectional view schematically showing an embodiment of a measuring device according to the present invention.

FIG. 2 is an assumed view schematically showing an embodiment of a measuring method according to the present invention.

FIG. 3 is a partially enlarged view of FIG.

[Explanation of symbols]

1 ... Cover, 11 ... Slag outlet, 12 ...
Auxiliary electrode, 2 ... infrared camera, 21 ... lens,
22 ... Lens tube, 23 ... Casing, 2
4 ... Light receiving part, 25 ... Visible light cut filter, 3
... Computing device, 4 ... Temperature display, A ... Molten slag, D ... Field of view

Claims (7)

[Claims] 1. A field of view of an infrared camera directed to a high-temperature object in a fume atmosphere is divided, the received light energy is obtained for each divided portion, and the temperature of only the divided portion having high received energy is calculated and displayed. Method for measuring the temperature of a high temperature object in a fume atmosphere. 2. The method for measuring the temperature of a high temperature object in a fume atmosphere according to claim 1, wherein the infrared camera has a water-cooled and / or gas-cooled lens tube. 3. The infrared camera has a light receiving element of 1.0 to
The method for measuring a high temperature object temperature in a fume atmosphere according to claim 1 or 2, which has a high sensitivity in a wavelength range of 2.0 µm. 4. The fume atmosphere according to claim 1, 2 or 3, wherein the received light energy is integrated for each divisional portion for a certain period of time to obtain an integrated value, and the temperature of only the divisional portion having a high integral value is calculated and displayed. How to measure the temperature of high temperature objects. 5. A high temperature in a fume atmosphere according to claim 1, 2 or 3, wherein a temporal change in received light energy is obtained for each divided portion, and the temperature of only the divided portion having a high received energy is calculated and displayed continuously for a certain period of time. How to measure body temperature. 6. An infrared camera having a water-cooled and / or gas-cooled lens tube, an arithmetic unit connected to a light receiving unit of the infrared camera, and a temperature display unit connected to the arithmetic unit. , The field of view of the infrared camera directed to a high-temperature object in a fume atmosphere is divided, the received light energy is obtained for each divided portion, and the temperature of only the divided portion having a high received energy is calculated and displayed. Measuring device for high temperature objects in fume atmosphere. 7. The infrared camera has a visible light cut filter between the light receiving portion and the lens.
Apparatus for measuring the temperature of a high temperature object in the described fume atmosphere.