JPH10253262A - Remaining thickness detecting method of refractory used to operating part of industrial furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remaining thickness detecting method of refractories, used to the operating part of an industrial furnace, which is capable of detecting the impossibility of detection due to the blocking of fluid passage previously and effecting trouble preventing measure quickly thereafter, upon detecting the remaining thickness of the refractories by the changes of the flow rate of fluid, a pressure and the like through the fluid passage in the refractories. SOLUTION: The remaining thickness of refractories used for the operating part of an industrial furnace is detected by a method wherein a fluid passage 2 is provided from the back surface side of refractories to the position of a predetermined thickness toward the operating surface side in the refractories to measure the change of flow rate or pressure of the fluid, supplied into or discharged out of the fluid passage 2, by flow rate detectors 6a, 6b or pressure detectors, arranged at the supplying side and discharging side of fluid connected to the fluid passage 2. In this case, the remaining thickness of refractories 1 is detected by the change and the detection of non-passing of the fluid in the fluid passage is also detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a residual thickness of a refractory used in an operating part of an industrial kiln such as a molten metal container, a molten metal processing apparatus, a cement kiln, an incinerator, and a heating furnace.

[0002]

2. Description of the Related Art Conventionally, wear of refractories used on the operating side of an industrial kiln, for example, refractories such as lining materials, gas injection nozzles or plugs, is a serious problem in operation. It is one of the very important tasks to ensure that the repair and replacement are performed efficiently. As a means of detecting the wear state of the refractory, that is, the remaining thickness of the refractory, it can be measured with various instruments using laser, image, temperature, back pressure, etc. There is known a method of determining a change by detecting the change.

[0003] Among these methods, as a method of detecting a wear state by a change using a fluid, for example, Japanese Patent Application Laid-Open No. 52-35104 discloses a method in which a fluid sensor is embedded in a furnace wall and a fluid sensor is injected. A method of detecting the erosion state of the furnace wall by opening the outlet and changing the back pressure due to the ejection of the fluid is disclosed. Japanese Utility Model Publication No. 62-19924 discloses that the furnace wall pressure is higher than the furnace internal pressure in the length direction of the furnace wall. A detection device is disclosed in which a plurality of partition chambers each containing a constant pressure fluid are provided and connected to a pressure fluid generator via a pressure measuring device outside the furnace.
JP-A-90562 discloses a gas blowing plug having a plurality of through holes communicating from the back surface to the upper surface and a semi-through hole penetrating partway from the back surface to the upper surface. Each of these pipes is buried with the tip sealed in a refractory, and the fluid that has been fed is squirted into the operating furnace due to wear of the refractory, and the fluid pressure measured by the source is measured. By detecting the change in the back pressure drop, it is possible to know to which position the operating surface has been worn.

Japanese Utility Model Laid-Open Publication No. Sho 60-117846 discloses a fluid sensor which can be inserted into a through hole in a furnace wall and injects gas substantially at a right angle, and measures a back pressure change and an inserted length of the fluid sensor. A device is disclosed, in which a fluid sensor that ejects a fluid from a tip portion substantially at right angles to the through hole is gradually inserted into a through-hole provided in a furnace wall, and a point at which the ejection port at the tip projects into the furnace. Thus, the back pressure of the fluid is reduced, and the remaining thickness of the furnace wall is detected by measuring the insertion length of the fluid sensor at that time.

[0005]

However, the above-mentioned Japanese Patent Application Laid-Open No. 52-35104 and Japanese Utility Model Publication No. Sho 62-1992.
No. 4 and Japanese Utility Model Application Laid-Open No. 63-90562 describe that these fluids are sealed in a refractory, so the reason why the back pressure does not decrease is because the refractory has not been worn yet. Alternatively, it is difficult to distinguish whether the back pressure is not lowered because the inside of the fluid supply path is blocked due to some kind of obstacle, so it can not be said that it is a sufficient wear confirmation means, and it may possibly lead to a molten metal leakage accident Was in In other words, with these detection means, when the fluid passage is closed halfway, not only can the remaining thickness of the refractory not be detected, but also it is possible to detect in advance that the fluid passage is closed halfway. It is difficult, and it is conceivable that there is no remaining refractory material without noticing the wear of the refractory material, leading to an accident.

Furthermore, in the case of the residual thickness detecting device disclosed in Japanese Utility Model Application Laid-Open No. Sho 60-117846, a change in back pressure due to clogging of the ejection port or a delay in a countermeasure due to an oversight that detection is not possible, or Work space for moving the fluid sensor forward and backward, mounting structure, safe work in a high temperature place, use in a place that does not come into contact with the molten metal, etc. in order to avoid trouble due to molten metal entering through the through hole, etc. And the scope of application is limited.

According to the present invention, when detecting the remaining thickness of a refractory through a change in a flow rate, a pressure, or the like of a fluid through a fluid passage in the refractory, it is necessary to detect in advance that the refractory cannot be detected due to a blockage of a fluid passage or a spout. An object of the present invention is to provide a method for detecting the remaining thickness of a refractory used in an operating part of an industrial kiln, in which a subsequent accident prevention measure can be promptly performed.

[0008]

According to the present invention, there is provided a fluid passage through which a fluid flows from a back side of a refractory to a working surface side inside the refractory to a predetermined thickness position, and a fluid supply side connected to the fluid passage. And a flow rate detector or a pressure detector disposed on the discharge side measures a change in the flow rate or pressure of the fluid supplied to or discharged from the fluid passage or filled, and detects the remaining thickness of the refractory based on the change. At the same time, the remaining thickness of the refractory used in the operating part of the industrial kiln for detecting whether or not the fluid is flowing in the fluid passage or whether or not pressurization can be filled is detected by the detector.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a fluid passage for injecting a fluid for flow rate or pressure measurement from the back of a refractory and passing through a predetermined thickness position inside the refractory and discharging from the back of the refractory is provided. By measuring the flow rate of the fluid supplied to and discharged from the fluid passage at a predetermined position and the pressure of the fluid to be filled under pressure, measurement of the residual thickness due to opening or blocking (blocking) of the fluid passage before use Detecting the impossible state, preventing the accident of molten metal leakage, and detecting the remaining thickness of the refractory.

In the present invention, water can be used as the fluid for measuring the flow rate and pressure, but it is preferable to use gas. When a metal tube is used as a passage through which a fluid can flow in the refractory, it is preferable to use a gas that reacts with the metal tube at a high temperature as little as possible, for example, a nitrogen gas or an argon gas. .

The present invention relates to a refractory used in an operating part of an industrial kiln such as a molten metal container, a molten metal processing apparatus, a cement kiln, an incinerator, and a heating furnace, that is, each container, device,
It can be applied to places where it is necessary to check the remaining refractories such as refractories for furnace lining, tuyere bricks, tuyere bricks and gas blowing plugs.

As a pressure detector for the fluid to be used, an electronic pressure sensor using a strain resistance or the like or a mechanical pressure sensor using a diaphragm or the like is used. As a flow rate detector, an electronic flow meter or a mass flow sensor is used. Meters can be used in combination.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a first embodiment of a method for detecting the opening or closing of a fluid passage and the remaining thickness of a refractory based on a change in a measured flow rate according to the present invention. Inside of the brick 1 S 4 mm outside diameter and 2 mm inside diameter
A U-shaped metal tube 2 made of US304 is installed, and argon gas is flowed from one of the metal tubes 2 at a flow rate of 1000 cc / min from an argon gas cylinder 3 via an on-off valve 4, a regulator 5 and a mass flow meter 6a, and discharged from the other. The flow rate of the supplied argon gas was detected by the mass flow meter 6b.

In this embodiment, first, when the fluid passage (metal tube) 2 installed in the refractory before use is closed for some reason, the flow rate detected by the mass flow meters 6a and 6b is zero. If the fluid passage 2 is opened for some reason before use, the flow rate detected by the mass flow meter 6b becomes smaller than the flow rate detected by the mass flow meter 6a. The flow rate of the argon gas detected in 6b was equal, and it was confirmed that there was no abnormality in the fluid passage 2.

Next, when the flow rate detected by the mass flow meter 6b during use becomes lower than the flow rate detected by the mass flow meter 6a (the flow rate detected by the mass flow meter 6a remains 1000 cc / min), The measured value of the remaining thickness of the magnesia-carbon brick 1 at the time when the end of the fluid passage 2 is opened as the wear of the refractory proceeds to the tip of the fluid passage 2 in the object, and the installation of the tip of the U-shaped fluid passage 2 The residual thickness of the magnesia-carbon brick 1 estimated from the position matched, and the method for detecting the residual thickness of the refractory according to the present invention was very effective.

FIG. 2 is a diagram showing the opening or closing of a fluid passage by measuring a pressure change of a fluid filled under pressure according to the present invention;
FIG. 4 is a schematic view of a second embodiment of the method for detecting the remaining thickness of the refractory, in which a SUS304 U-shaped fluid passage (metal tube) 2 having an outer diameter of 4 mm and an inner diameter of 2 mm is placed inside a magnesia-carbon brick 1 of a converter. Is installed from the argon gas cylinder 3 via the on-off valve 4 and the regulator 5, and pressurized and filled with argon gas from one of the fluid passages 2 at a pressure of 2 kg / cm2. Detected by sensor 7.

In this embodiment, first, before the stool, the fluid passage 2
Is closed for some reason, the pressure detected by the diaphragm sensor 7 is zero, and if the fluid passage 2 is opened for some reason before use,
Although the pressure detected by the diaphragm sensor 7 becomes smaller than the pressure of the argon gas to be pressurized and filled into the fluid passage 2 by the regulator 5, the pressure detected by the diaphragm sensor 7 and the regulator 5 before use cause the fluid passage 2 to enter the fluid passage 2. The pressures filled under pressure were equal, and it was confirmed that there was no abnormality in the fluid passage 2.

Next, the diaphragm sensor 7 during use
When the pressure of the argon gas detected at the time becomes lower than the pressure for pressurizing and filling the fluid passage 2 in the refractory by the regulator 5, that is, the wear of the refractory proceeds to the tip of the refractory in the fluid passage 2, The measured thickness of the magnesia-carbon brick 1 at the time when the tip of the fluid passage 2 is opened and the remaining thickness of the magnesia-carbon brick 1 estimated from the installation position of the tip of the U-shaped fluid passage (metal pipe) 2 are as follows. In agreement, the method for detecting the remaining thickness of refractories according to the present invention was very effective.

Hereinafter, the method for detecting the remaining thickness of the refractory of the present invention will be described together with various structures of the fluid passage.

As a detection method, a method of flowing a fluid through a fluid passage and measuring the flow rate of the fluid, and a method of pressurizing and filling the fluid in the fluid passage and measuring the pressure of the fluid can be used. .

FIG. 3 is a schematic view of a fluid passage used in the present invention. A fluid passage 2 capable of injecting and discharging a fluid into a refractory is provided so that the tip of a U-shaped tube is at a desired thickness position. It is the structure provided in.

FIG. 4A shows the state in which the fluid passage 2 of the refractory shown in FIG. 3 is opened due to wear, and FIG.
FIG. 3 is a schematic view showing a state in which the fluid passage 2 is closed due to adhesion or entry of metal or the like.

Although the above-described two embodiments have been described as a method for detecting the remaining thickness, when the fluid passage 2 is opened as shown in FIG. 4A, the fluid is discharged from the opening by the flow rate detection method. Since the flow rate measured on the fluid discharge side becomes smaller than the flow rate measured on the fluid supply side, it is possible to detect that the fluid passage 2 has been opened. When the flow rate is measured only on the fluid discharge side, it is possible to detect the opening of the fluid passage 2 by decreasing the flow rate.

When the pressure is detected by the pressure of the filled fluid, since the fluid is discharged from the opening, the pressure measured on the fluid discharge side becomes smaller than the filling pressure indicated on the fluid supply side. Opening can be detected, and when pressure is measured only on the fluid discharge side, opening can be detected when the pressure becomes lower than the initial pressure.

Next, in the method for detecting the remaining thickness when the fluid passage 2 is closed as shown in FIG. 4B, the detection based on the flow rate is such that both the flow rates measured on the fluid supply side and the fluid discharge side become zero. This can be achieved by detecting blockage of the fluid passage.

In the detection based on the pressure, since the pressure measured on the fluid discharge side is smaller than the pressure charged and filled on the fluid supply side, it is possible to detect that the fluid passage 2 is closed. However, since there may be no case where the fluid passage 2 is closed and there is no pressure drop, it is preferable to change the pressure on the pressurized filling side with time and measure the changed pressure.

Prior to the detection of the remaining thickness, it is necessary to confirm that the flow rate of the fluid measured on the fluid supply side and the flow rate of the fluid on the discharge side are the same in the case of the flow rate. When confirming or measuring the flow rate only on one side of the fluid discharge side, it is necessary to confirm that the fluid is flowing to the fluid discharge side and that the fluid is pressurized and filled in the fluid passage 2 so that there is no leakage of the fluid. Confirm. In the case of pressure, it is confirmed that the pressure of the fluid pressurized and filled at a constant pressure is equal to the pressure of the fluid measured on the fluid discharge side. further,
When measuring pressure only on one side of the fluid discharge side, it detects that it is not a closed state by sensing the fluid pressure, and detects that there is no change in the pressure sensed in the filled state and there is no opening Then, it is confirmed that the method for detecting the remaining thickness of the present invention can be implemented.

FIG. 5 is a schematic view of various fluid passages used in the present invention. FIG.
(B) is an example in which the tip is angular, FIG. 5- (c) is an example in which the fluid passage in the refractory is divided into two and circulates at the tip, and FIG.
Is an example of a structure in which a fluid passage is composed of a plurality of layers, and a fluid flows out from an inner passage or an outer passage at a tip portion. As described above, if the fluid flows into and out of the fluid passage 2, a back pressure or a change in the flow can be detected by installing a fluid pressure or flow rate detector outside the fluid passage 2.

FIG. 6 is a schematic view of a plurality of fluid passages provided in a stepwise manner used in the present invention. It is also possible to detect the wear speed and the wear state of the object 1.

Injecting a fluid into a refractory as in the present invention,
And the fluid passage that can be discharged, in the refractory,
For example, it can be easily manufactured by embedding a metal tube. However, in refractories used at very high temperatures, if the metal tube is oxidized or carbonized, it may be opened before it comes into contact with molten metal, etc. due to wear of the refractory. Although it is possible to use a material that has very high corrosion resistance at high temperatures, it is possible to use a metal tube (in a passage).
If a method of measuring the flow rate and / or the pressure of the fluid by flowing the fluid through the pipe is adopted, the metal pipe is cooled by the flowing fluid, so that inexpensive metal such as stainless steel is sufficiently durable.

[0031]

The present invention is a measuring method capable of detecting the remaining thickness and the wear state of a refractory by properly detecting a flow rate and a change in pressure. It can be applied to the detection of the residual thickness of refractory used in the part in contact with the operating side in industrial kilns such as treatment equipment, cement kilns, incinerators, and heating furnaces.

Further, when detecting the remaining thickness of the refractory from a change in the flow rate and pressure of the fluid through the fluid passage in the refractory, the impossibility of detecting the flow rate and pressure due to the blockage of the fluid passage is detected in advance, and the subsequent accident prevention It is now possible to take immediate action.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first embodiment of the present invention.

FIG. 2 is a schematic view of a second embodiment of the present invention.

FIG. 3 is a schematic view of a fluid passage used in the present invention.

FIG. 4 (a) shows the unsealed state of the fluid passage, and FIG.
FIG. 4B is a schematic diagram illustrating a fluid passage closed state.

FIG. 5 is a schematic view of various fluid passages used in the present invention.

FIG. 6 is a schematic view of a plurality of fluid passages provided in a stepwise manner used in the present invention.

[Explanation of symbols]

 Reference Signs List 1 brick (refractory) 2 metal pipe (fluid passage) 3 argon gas cylinder 4 on-off valve 5 regulator 6a, 6b mass flow meter 7 diaphragm sensor

Claims (2)

[Claims] 1. A fluid passage through which fluid flows from a rear side of a refractory to a working surface side inside the refractory to a predetermined thickness position, and a fluid discharge side connected to the fluid passage, or a supply side and a discharge side. The change in the flow rate of the fluid supplied to and discharged from the fluid passage is measured by the disposed flow rate detector, and the remaining thickness of the refractory is detected by the change. A method for detecting the remaining thickness of refractories used in operating parts of industrial kilns that detects whether fluid can flow. 2. A fluid passage through which fluid flows from a back side of the refractory to a working surface side inside the refractory to a predetermined thickness position, and is provided together with a fluid discharge side or a fluid supply side connected to the fluid passage. A fluid pressure detector measures a change in pressure of the fluid pressurized and filled in the fluid passage, detects the remaining thickness of the refractory based on the change, and determines whether the fluid can be filled into the fluid passage before use by the detector. Method for detecting the remaining thickness of refractories used in the operating part of an industrial kiln that detects air.