JPH09217990A - Inspection for cooling state in water cooling type hollow body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and accurately grasp a cooling state by cooling water in a water cooling type hollow body. SOLUTION: A hollow body 4 is provided with spray nozzles 14 in a space part 7 between two side plates 6 and 5. Cooling water is sprayed to the inner surface of the side plate 5 in a heat receiving side by the spray nozzles 14 so that the side plate is cooled. In this case, inspected water W having a temperature difference relative to an inspected atmosphere temperature is supplied to the spray nozzles 14. The temperature distribution of the side plate 5 whose temperature is changed by spraying the inspected water W through the spray nozzles 14 is measured from the outer surface side of the side plate 5 in the heat receiving side by a thermography device 31 to form an image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-receiving side plate or a meandering bend of a double structure hollow body having two side plates, such as a water-cooled furnace lid or furnace wall of an industrial furnace. The present invention relates to a method for inspecting a cooling condition in a water-cooled hollow body in which a pipe wall of a hollow body made of a pipe is cooled by a spray nozzle provided in the hollow body or cooling water flowing in the hollow body.

[0002]

2. Description of the Related Art As a furnace lid or furnace wall (side wall) of an arc furnace for melting metal materials or melting waste, a part or all of the furnace lid or furnace wall is made of heat-resistant steel. A spray-cooled furnace lid or furnace wall (a hollow body having one side plate, and cooling the side plate on the heat receiving side by spraying cooling water from a spray nozzle provided in a space between these two side plates ( Hereinafter, these are collectively referred to as "hollow bodies")
It is proposed by Japanese Patent Laid-Open No. 0538 and Japanese Patent Laid-Open No. 3-75493.

The above-mentioned spray-cooled hollow body is light in weight and has a high cooling efficiency and a low risk of water leakage into the furnace, as compared with a system in which the cooling water is filled and flowing in the hollow body. Although it has the characteristics described above, it is necessary that the cooling by the spray is performed without excess or deficiency. In other words, if there is insufficient spray, there is a risk of local overheating of the heat-receiving side plate, melting damage, and water leakage accidents in the furnace due to it, and excessive cooling uses a large amount of cooling water and increases operating costs. At the same time, if the drainage layer flowing along the inner surface of the side plate becomes thicker, the cooling effect of the spray will be reduced.

Therefore, a spray-cooled hollow body is generally tested in a cooling system after being manufactured in a factory and before shipment to inspect the spray condition. As a method of this inspection, a large number of side plates on the non-heat receiving side are used. From the inspection hole provided, there was only a way for the operator to visually observe the spray situation or put his hand to check the contact condition of the spray water, so it is laborious and inefficient, and the inspection hole There are many problems that it is difficult to observe the spray condition depending on the position and size, and it is difficult to accurately grasp the spray distribution condition and hence the cooling condition.

Further, the cooling water is filled in a water-cooled box-type water-cooled hollow body in which the cooling water flows in a meandering cooling water flow passage in the box body or in a meandering bent pipe. In the meandering tube type water-cooled hollow body that flows through, unlike the case of the spray cooling type, the circulation state of the cooling water cannot be visually observed at all, and the temperature of each part is measured by a thermometer in the cooling water circulation state. Is complicated and the number of thermometers is limited, so it is difficult to accurately grasp the cooling status.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and provides a cooling condition inspection method capable of efficiently and accurately grasping the cooling condition of cooling water in a water-cooled hollow body. To do.

[0007]

According to the first aspect of the present invention,
A water-cooled hollow body that cools the side plate by providing a spray nozzle in the space between the two side plates and spraying cooling water on the inner surface of the heat-receiving side plate by the spray nozzle.
An inspection water having a temperature difference with respect to the inspection atmosphere temperature is supplied to the spray nozzle, and the temperature distribution of the side plate on the heat receiving side that has changed in temperature due to spraying of the inspection water by the spray nozzle is used by the thermographic device to obtain the heat receiving side. It is characterized in that it is measured from the outer surface side of the side plate and imaged.

According to a second aspect of the present invention, there is provided a water-cooled hollow body in which a cooling water flow passage is formed in a space between two side plates, and the side plate on the heat receiving side is cooled by cooling water flowing through the cooling water flow passage. The inspection water having a temperature difference with respect to the inspection atmosphere temperature is supplied into the cooling water flow passage, and the temperature distribution of the heat-receiving side plate whose temperature has changed due to the flow of the inspection water is measured by a thermography device. It is characterized in that it is measured from the outer surface side and imaged.

According to a third aspect of the present invention, a cooling water flow passage extending from one end to the other end of the pipe is formed in the pipe bent in a meandering shape, and the cooling water flowing through the cooling water flow passage is provided on the heat receiving side. In a water-cooled hollow body that cools a pipe pipe wall, test water having a temperature difference with respect to a test atmosphere temperature is supplied into the cooling water flow passage, and the pipe pipe on the heat receiving side is changed in temperature by the flow of the test water. It is characterized in that the temperature distribution of the wall is measured and imaged from the outer surface side of the heat receiving side pipe tube wall by a thermography device.

[0010] The invention according to claim 4 is the invention according to claim 1 or 2.
Alternatively, in the invention described in 3, hot water having a temperature of 5 ° C. or higher with respect to the temperature of the test atmosphere is used as the test water.

In the present invention, the temperature difference with respect to the inspection atmosphere of the inspection water is preferably 5 ° C. or more in order to clarify the temperature distribution on the image by the thermographic device and surely grasp the cooling situation from the temperature distribution. Further, if the temperature difference is set to 10 ° C. or more, the temperature distribution is further clarified, and the cooling condition is more easily grasped, which is more preferable. Further, if the temperature difference is 20 ° C. or more, even if the inspection time is long and there is a tendency that the temperature of the side plate or pipe pipe wall whose temperature is to be measured is increased or decreased due to spraying or distribution of the inspection water, the inspection is performed. Since the temperature difference between the atmosphere and the inspection water is large, it is easy to understand the cooling status based on the temperature distribution, which is particularly preferable.

Further, as the inspection water in the present invention,
As the cold water having a temperature lower than the inspection atmosphere temperature, for example, tap water in the summer or cooling water cooled by a cooling device can be used, and as the hot water having a temperature higher than the inspection atmosphere temperature, hot water heated by a heater or the like can be used. it can. Of these, particularly when hot water is used as the test water, it is possible to easily obtain hot water having a desired temperature difference higher than the test atmosphere temperature by a simple and inexpensive device such as an electric heater, and increase the temperature difference. It has the advantage that the temperature distribution of the image by the thermography device (however, the low temperature part during the cooling operation of the water-cooled hollow body is displayed as the high temperature part during inspection) can be clarified and the cooling status can be grasped with high accuracy. is there.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a spray cooling type furnace lid of a three-phase AC arc furnace, which is mounted on a pedestal 21 of an inspection device 20. The furnace lid 1 is formed in a double-structured annular hollow body 4 using a steel plate, except for a small refractory small ceiling portion 3 having three electrode insertion holes 2, and 5 is for receiving the heat. Side (inside the furnace), 6 is the non-heat receiving side (outside the furnace)
The side plates 7 and 7 are spaces between these side plates. Reference numeral 10 is a cooling device provided in the space 7, 11 is a water supply header made of an annular large diameter pipe, 12 is a water supply port to this header,
During operation of the furnace, it is connected to a cooling water supply source (not shown).
Reference numeral 13 denotes a branch pipe radially connected to the water supply header 11. A large number of spray nozzles 14 are provided on both sides of the branch pipe 13 with their ejection ports facing the inner plate 5.
(See FIG. 2). Reference numeral 16 denotes a drain port provided on the outer peripheral portion of the hollow body 4 and communicating with the hollow body, which is connected to a drain pipe during the furnace operation.

On the other hand, the inspection device 20 is provided with a temperature measuring device 22 below the furnace lid 1 inside the pedestal 21 and a hot water supply device 23 beside the pedestal 21. The gantry 21 is the furnace lid 1
An annular abutment 21a for supporting the lower surface of the edge portion of the above is fixed to a column 21b standing on the foundation. In the temperature measuring device 22, 25 and 25 are rails laid in parallel on the foundation,
A trolley 27 having wheels 26 rolling on the rail 25 rotatably supported on the lower surface is movably supported in the front-rear direction (direction orthogonal to the paper surface of FIG. 1), and is fixedly mounted on the trolley 27.
On a rail 29 extending in the direction orthogonal to 5, a transverse table 30 is supported so as to be reciprocable in the left-right direction along the rail.

Reference numeral 31 denotes a thermographic device for detecting the temperature distribution on the surface of the object, displaying / recording it as an image, and analyzing it. A camera unit (thermal image camera) 32 having an infrared detector and an optical scanning mechanism, and this camera unit 32. The controller unit 33 processes the signal sent from the device and outputs temperature distribution image data to the monitor display 33a, a built-in floppy disk drive unit, a color copying unit and the like for storage. The camera unit 32 is mounted on the traverse base 30 with its lens facing the outer surface (lower surface) of the side plate 5 of the hollow body 4, and the controller unit 33 is installed on the side foundation of the carriage 27. There is.

The hot water supply device 23 includes an electrothermal heater 41 and a strainer 42 in a tank 40 installed on a foundation.
With a pump 43 attached, connect the water supply pipe 44 connected to the discharge port of the pump 43 to the water supply port 12 of the furnace lid 1, and open the drainage pipe 45 connected to the drainage port 16 in the tank 40 as a return pipe. Become. 46 is a throttle valve provided in the water supply pipe 44,
Reference numeral 47 is also a pressure gauge, and 48 is also a flow meter. Further, 49 is a bypass line, and 50 is a throttle valve. The inspection water W in the tank 40 is maintained by the heater 41 at a predetermined temperature (in this specific example, the inspection water temperature = 20 ° C., the hot water temperature = 40 ° C.).

In order to inspect the spray condition in the hollow body 4 by the device having the above-mentioned structure, the pump 43 of the hot water supply device 23 is operated to supply the inspection water W to the water supply header 11 via the water supply port 12. As a result, the inspection water W is ejected from each spray nozzle 14 through each branch pipe 13 and the hollow body 4
Is blown onto the inner surface of the side plate 5 on the heat-receiving side to raise the temperature of the inner plate 5 of the blowing part. In the temperature measuring device 22, the thermography device 3 is driven by driving the carriage 27 and the traverse base 30.
The camera unit 32 of No. 1 is moved to a desired position and stopped, the temperature of the outer surface of the side plate 5 is measured, the controller unit 33 obtains an image of the surface temperature distribution of the side plate 5, and is displayed on the monitor display 33a or a floppy disk. Recording to and output from hard copy.

Since the temperature of the inspection water W is sufficiently higher than the inspection atmosphere temperature (normal temperature) of the furnace lid 1, for example, the insufficient spray portion 56 between the spray nozzles 14 and 14 in FIG. 2 (the spray spraying range 55 of each spray nozzle covers it). The temperature rise of the non-heated portion) is lower than the temperature rise of the spray spray range 55, and this temperature difference is shown in the temperature distribution image 57 shown in FIG. For example, it is clearly displayed as a low temperature region 59 of green to blue, and the presence of the insufficient spray portion (insufficient cooling portion) 56 can be surely and easily grasped by the low temperature region 59. 2 and 3, the four spray nozzles 14 are illustrated, and the spray spraying range 55 of another adjacent spray nozzle 14 and the low temperature region 59 generated between the ranges are omitted.

The camera unit 32 is further moved to move the hollow body 4
If the entire lower surface of the side plate 5 is scanned, in addition to the insufficient spray portion 56 between the spray nozzles 14 as described above, an insufficient spray portion due to, for example, clogging of the spray nozzle 14 or a defective mounting direction can be detected. Further, by adjusting the throttle valve 46, it is possible to easily detect a change in the spray condition due to a change in the flow rate or pressure of the test water W.

As described above, the temperature distribution of the side plate 5 heated by the spray of the inspection water W is measured by the thermography device 31.
If it is measured and displayed as a temperature distribution image, the spray distribution condition, and hence the cooling condition, can be obtained without spending time and labor such as visual observation from the inspection hole (not shown) provided in the side plate 6 as in the conventional case. Can be detected and grasped quickly, easily and accurately with the temperature distribution image.

Next, FIG. 4 shows another embodiment of the present invention, in which 61 is a furnace body of a three-phase AC arc furnace, and the spray cooling type furnace wall is a steel plate on the heat receiving side (inside the furnace). The hollow body 64 has a double cylindrical structure having a side plate 65 and a non-heat receiving side (outside the furnace) side plate 66, and 67 is a space between both side plates. Reference numeral 70 denotes a cooling device provided in the space 67, which has the same structure as the cooling device 10 of the specific example except that the branch pipe 13 is oriented in the vertical direction. Are shown and the detailed description thereof is omitted.

In addition, the temperature measuring device 72 is such that an elevating body 74 is vertically movably mounted on a substrate 73 that is detachably placed on a furnace body 51 placed on the floor of a test site, and a vertical axis line is attached to the lower surface of the elevating body 74. The camera unit 32 of the thermography device 31 is mounted on a swivel base 75 that is rotatably supported around it, with the lens facing the outer surface of the inner plate 65. The output cable of the camera unit 32 is connected to the controller unit 33 on the board 73. Reference numeral 76 is an air cylinder for driving the lifting body 74, 77 is a guide rod for stopping the rotation of the lifting body 74, and the swivel base 75 is swivel-driven by a drive device (not shown).

Also in the above inspection device, the inspection water W is supplied to the water supply header 11 of the cooling device 70 by the same hot water supply device 23 as in the specific example of FIG.
By spraying warm water on the inner surface of the side plate 65 on the heat receiving side, and measuring the temperature distribution of the side plate 65 at this time by the thermography device 31 and imaging it, the spray distribution condition, and thus the cooling condition, can be efficiently evaluated as in the above-mentioned specific example. Can be grasped accurately and accurately.

Although the spray cooling type hollow body has been described above, the present invention shows a water cooling box type hollow body 81 or a meandering shape as shown in the example of the furnace wall 80 of the arc furnace in FIGS. A meandering tube type hollow body 8 consisting of a bent pipe
2, or a cooling water flow formed inside the hollow body such as a furnace lid (not shown) in which the inside of the double-structured hollow body 4 of the furnace lid 1 is divided into a meandering shape by a partition plate like the hollow body 81. The present invention can also be applied to the inspection of the cooling condition in a water-cooled hollow body of the type in which cooling water is filled and flows in a passage.

In FIGS. 5 to 7, a hollow body 81 provided in the lower portion of the furnace wall 80 is a heat-resistant steel box body 86 having a side plate 84 curved along the inner surface of the furnace shell 83 and a heat receiving side plate 85.
The inside is partitioned by a partition plate 87 to form a meandering cooling water flow passage 88.
And a water supply port 89 and a drain port 90 communicating with both ends of the cooling water flow passage 88. Also the furnace wall 80
The meandering tube type hollow body 82 provided on the upper part of the heat-resistant steel tube is bent in a meandering shape in the same manner as the mounting plate 92 which is curved along the inner surface of the furnace shell 83 and is closely arranged as shown in FIG. The pipe 93 is fixed via a bracket 94, and a water supply port 96 and a drain port 97 are provided at both ends of a meandering cooling water flow passage 95 formed in the pipe 93. In addition, in the clearance between the adjacent pipes of the bent pipe 93, an irregular shaped refractory material is filled up to near the furnace inner end surface position of the bracket 94 at the furnace body installation site, and the furnace shell 83 of the pipe 93 is filled.
The side portion is buried in the refractory material layer, but in the furnace body manufacturing factory, the cooling condition inspection may be performed in the illustrated state without the refractory material.

When inspecting the cooling condition of these hollow bodies 81, 82, for example, the temperature measuring device 72 shown in FIG. 4 is used to supply the inspection water W from the hot water supply device 23 of FIG.
6, and is supplied into the hollow bodies 81 and 82 to flow through the cooling water flow passages 88 and 95 in the hollow bodies in a filled state. At this time, the side plates 85 of the hollow bodies 81 and the inside of the furnace of the hollow bodies 82 are seen. The temperature distribution of the pipe wall portion of the pipe 93 may be imaged by a thermographic device. Then, on this image, for example, a stagnation part or a flow velocity decreasing part of the flow of the cooling water flow passages 88 and 95 is displayed as a low temperature part on the temperature distribution image, whereby the insufficient cooling part can be detected and grasped. The hollow body 81 may have a rectangular parallelepiped box body 86 that does not curve along the inner surface of the furnace wall 83. Similarly, the hollow body 82 also has a meandering shape bent in a meandering manner on a plane. It may be a tubular type.

The present invention is not limited to the above specific examples, and the specific configurations of the temperature measuring devices 22, 72 and the hot water supply device 23 may be other than those described above. Further, as the inspection water, cold water having a temperature lower than the inspection atmosphere temperature may be used instead of the above-mentioned hot water, but in this case, the spray insufficient portion (insufficient cooling portion) appears as a high temperature region on the temperature distribution image. Further, the present invention can also be applied to inspection of cooling conditions of various furnaces other than the above-mentioned arc furnace, water-cooled lids such as ladle, and furnace walls.

[0028]

As described above, according to the invention of claim 1, the spray distribution state of the side plate portion on the heat receiving side at the time of spraying by the spray nozzle of the inspection water having a temperature difference with respect to the inspection atmosphere temperature, Since the temperature distribution image is displayed by the thermographic device, the spray distribution condition of the spray cooling type hollow body, and hence the cooling condition, can be grasped efficiently and accurately.

According to the second aspect of the present invention, the temperature distribution state of the side plate portion on the heat receiving side when the inspection water having a temperature difference with respect to the inspection atmosphere temperature flows through the cooling water flow passage,
Since the temperature distribution image is displayed by the thermographic device, the cooling status of the water-cooled box-type water-cooled hollow body can be grasped efficiently and accurately.

According to the third aspect of the present invention, the temperature distribution state of the pipe pipe wall portion on the heat receiving side when the inspection water having a temperature difference with respect to the inspection atmosphere temperature is distributed in the cooling water flow passage is measured by the thermography device. Since the temperature distribution image is displayed, it is possible to efficiently and accurately grasp the cooling status of the meandering tube type water-cooled hollow body.

According to the fourth aspect of the invention, it is possible to easily obtain hot water having a temperature difference higher than the inspection atmosphere temperature by a desired temperature difference with a simple and inexpensive device such as an electric heater, and this temperature difference is large. Then, the temperature distribution of the image by the thermographic device can be clarified, and the cooling condition can be grasped accurately.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a specific example of an apparatus and a test object for carrying out the method of the present invention.

FIG. 2 is a plan view taken on line AA of FIG. 1;

FIG. 3 is a schematic view of a temperature distribution image in which the temperature of the side plate on the heat receiving side of the portion of FIG. 2 is detected and imaged by a thermography device.

FIG. 4 is a vertical cross-sectional view showing another specific example of the apparatus for carrying out the method of the present invention and the inspection object.

FIG. 5 is a vertical cross-sectional view showing still another specific example of the inspection object of the method of the present invention.

6 is a side view taken along the line BB in FIG. 5;

7 is a side view taken along the line CC (partially cutaway) of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Furnace lid, 4 ... Hollow body, 5 ... Side plate, 6 ... Side plate, 7 ... Space part, 10 ... Cooling device, 11 ... Water supply header, 13 ... Branch pipe,
14 ... Spray nozzle, 22 ... Temperature measuring device, 23 ... Hot water supply device, 31 ... Thermography device, 32 ... Camera part, 33 ... Controller part, 33a ... Monitor display, 40 ... Tank, 41 ... Heater, 43 ... Pump, 4
4 ... Water supply pipe, 55 ... Spray spraying area, 56 ... Spray insufficient part, 57 ... Temperature distribution image, 58 ... High temperature area, 59 ... Low temperature area, 61 ... Furnace body, 64 ... Hollow body, 65 ... Side plate, 66 ...
Side plate, 67 ... Space part, 70 ... Cooling device, 72 ... Temperature measuring device, 81 ... Hollow body, 82 ... Hollow body, 84 ... Side plate, 85 ...
Side plate, 86 ... Box body, 87 ... Partition plate, 88 ... Cooling water flow passage, 93 ... Pipe, 95 ... Cooling water flow passage, W ... Inspection water.

Claims (4)

[Claims] 1. An inspection atmosphere in a water-cooled hollow body in which a spray nozzle is provided in a space between two side plates and cooling water is sprayed onto the inner surface of the heat-receiving side plate by the spray nozzle to cool the side plate. An inspection water having a temperature difference with respect to a temperature is supplied to the spray nozzle, and a temperature distribution of the heat-receiving side plate whose temperature is changed by spraying the inspection water by the spray nozzle, a heat-receiving side plate by a thermographic device. A method for inspecting a cooling condition in a water-cooled hollow body, characterized by measuring from the outer surface side and imaging. 2. A water-cooled hollow body in which a cooling water flow passage is formed in a space between two side plates, and the side plate on the heat receiving side is cooled by cooling water flowing through the cooling water flow passage, with respect to an inspection ambient temperature. The test water having a temperature difference is supplied into the cooling water flow passage, and the temperature distribution of the heat-receiving side plate whose temperature is changed by the flow of the test water is measured from the outer surface side of the heat-receiving side plate by a thermography device. A method for inspecting a cooling condition in a water-cooled hollow body, characterized by imaging. 3. A cooling water flow passage extending from one end to the other end of the pipe is formed in a meanderingly bent pipe, and cooling of the pipe pipe wall on the heat receiving side is performed by the cooling water flowing through the cooling water flow passage. In the water-cooled hollow body to be performed, the inspection water having a temperature difference with respect to the inspection atmosphere temperature is supplied into the cooling water flow passage, and the temperature distribution of the pipe pipe wall on the heat receiving side whose temperature is changed by the flow of the inspection water, A method for inspecting a cooling state in a water-cooled hollow body, characterized by measuring from the outer surface side of the heat-receiving side pipe tube wall by a thermography device and imaging. 4. The inspection water is 5 at the inspection ambient temperature.
The method for inspecting a cooling condition in a water-cooled hollow body according to claim 1, 2 or 3, wherein the water is hot water having a temperature of ℃ or higher.