JPH063197A - Blast furnace furnace body temperature monitoring device and temperature control device using the same - Google Patents

Abstract

(57) [Summary] [Purpose] The temperature of the iron shell of the blast furnace is monitored, and water is sprayed automatically at high temperatures to protect the furnace body. [Structure] The optical fiber 2 is spirally arranged on the surface of the iron shell,
One of the terminals is connected to the measuring instrument 23. In the measuring instrument 23, the pulse drive circuit 4 drives the optical switch 14 to form two types of detection paths having different lengths of 0.5 m, and the Raman scattered light generated at each part of the detection paths is used as a basis. Then, the temperature distribution measured value is calculated by the high-speed averaging processing device 11. Calculated phase of 0.5m shifted both detected values determined whether it exceeds the desired setting temperature in the control computer 25 to the original, with respect to hot spots, which exceeds the set temperature,
Water is sprayed by opening the corresponding automatic control valve 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature monitoring device for a furnace body of a blast furnace for continuously detecting the temperature distribution on the surface of the iron shell of the blast furnace and maintaining the furnace body, and a temperature control device using the same.

[0002]

2. Description of the Related Art In order to perform stable blast furnace operation, it is necessary to know the condition inside the blast furnace, and abnormally high temperatures shorten the life of the iron shell. It was necessary to monitor the temperature. Therefore, conventionally, the surface temperature of the iron shell of the blast furnace is monitored by installing a number of pyrometers such as thermocouples on the entire surface of the iron shell of the blast furnace body.

Further, as described in Japanese Patent Publication No. 57-31073, a plurality of movable carriages are installed around the blast furnace, and the iron skin surface temperature is moved while moving each carriage carrying a radiation thermometer. There is also disclosed an apparatus for measuring the temperature and detecting an abnormally high temperature location.

[0004]

However, the above-mentioned method of measuring temperature by installing a pyrometer such as a thermocouple on the surface of a steel shell requires a large number of thermocouples, which requires enormous equipment costs. In addition, it requires a lot of time and labor for its maintenance and inspection, and in spite of that, it lacks accuracy in finding an abnormally hot spot.

Further, in the iron skin surface temperature monitoring device described in Japanese Patent Publication No. 57-31073, it is necessary to install a traveling device for a truck carrying a monitoring unit around the blast furnace body. It is difficult to install a traveling device around the blast furnace where cooling water pipes, various gas pipes, cables, rebars, etc. are intricate, and in addition, the equipment cost required for the traveling device and position detection device of the bogie. Is expensive and requires a lot of time and labor for maintenance and inspection because the equipment is complicated. Furthermore, since the blast furnace furnace area is hot and humid, and is in a CO gas atmosphere, it is a traveling device for the truck. There was an unsolved problem that it was mechanically difficult to operate.

Therefore, the present invention has been made by paying attention to the above-mentioned unsolved problems of the prior art, and monitors the temperature of all the necessary parts of the surface of the blast furnace iron shell thoroughly to accurately detect an abnormally high temperature part, An object of the present invention is to provide a temperature monitoring device for a furnace body of a blast furnace capable of maintaining the furnace body and a temperature control device using the same.

[0007]

In order to achieve the above object, the apparatus according to claim 1 is a temperature monitoring device for a blast furnace body for monitoring the temperature of the blast furnace body, which is arranged spirally on the surface of the iron shell. An optical fiber provided, and a temperature measuring means that is connected to one end of the optical fiber and measures the temperature distribution on the surface of the iron shell from the backward Raman scattered light intensity and its return time when an optical pulse is incident on the optical fiber, It is characterized by having.

A device according to claim 2 is the device according to claim 1.
The optical fiber described in (1) is characterized in that a margin is provided in the middle of the spiral. Further, in the apparatus according to claim 3, the optical fiber spirally arranged on the surface of the iron skin, the backward Raman scattered light intensity when an optical pulse is incident on the optical fiber connected to one end of the optical fiber, Temperature measurement means for measuring the temperature distribution on the surface of the iron shell from the return time, and whether the temperature distribution information from the temperature measurement means exceeds a set temperature that has been arbitrarily set, and the set temperature is exceeded. When it is determined that the water spray valve is open, the water spray control means opens the water spray valve at the corresponding high temperature portion, and the water spray means is controlled by the water spray control means to spray water on the surface of the iron shell.

[0009]

In the present invention, the optical fiber is spirally arranged on the surface of the iron shell of the blast furnace, the backward Raman scattered light intensity generated at each part of the optical fiber is detected, and the temperature is calculated from the detected intensity and its return time. The temperature distribution on the surface of the iron skin is measured by the measuring means. Based on the measured temperature distribution, the sprinkling control means determines whether there is an abnormally high temperature location, and controls the sprinkling means to sprinkle the relevant location. In the case of the optical fiber having a margin, the optical fiber is temporarily retracted during maintenance work.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 1 is a blast furnace body, and 21 is a steel shell forming the outer periphery of the blast furnace. An optical fiber 2 made of, for example, quartz glass or multi-component glass, which has heat resistance, is arranged on the surface of the iron shell 21.
They are arranged in a spiral shape at a constant interval of 0 mm or less, and a margin allowance 22 is provided every two to three turns of the spiral in the middle of the spiral on the surface of the iron shell.
It has been made possible to evacuate.

Further, a water sprinkling ring tube 27 is horizontally arranged around the iron shell 21 around which the optical fiber 2 is spirally wound, which is the same as the disposing interval of the optical fibers 2. The sprinkling ring pipes 27 are arranged at the same intervals as the number of spiral stages. The sprinkling nozzle 2 is attached to the sprinkling ring pipe 27.
6 is provided, and water is sprayed from the water spray nozzle 26 onto the iron shell 21.

One end of the optical fiber 2 is connected to a measuring device 23 as a temperature measuring means, and the measuring device 23 calculates the temperature and the position based on the measured value of the optical fiber, and the calculation result is displayed on a display computer ( CRT) 24 and sprinkling control computer 25, and display computer (CRT)
At 24, the calculation result is displayed on the CRT. In the sprinkling control computer 25, based on the calculation result, it is determined whether or not the calculated temperature exceeds a preset temperature set in advance,
If it exceeds, the automatic water supply valve 26 corresponding to the sprinkling ring pipe 27 arranged around the abnormally high temperature location is opened, and water is sprayed from the sprinkling nozzle 28 to the abnormally high temperature location to lower the temperature of the abnormally high temperature location. When this happens, the automatic water supply valve 26 is closed to stop watering.

As shown in FIG. 2, the measuring instrument 23 drives a pulse semiconductor laser (hereinafter referred to as LD) 5 driven by a pulse drive circuit 4 to oscillate an optical pulse, and an optical pulse oscillated by the pulse semiconductor laser 5. Light that has two types of interference filters 7 and 8 that enter the optical fiber 2 and separate the Stokes light and the anti-Stokes light, which are the two components of the Raman backscattered light, from the backscattered light at each part of the optical fiber 2. The pulse width of the optical pulse driven by the demultiplexer 6 and the pulse drive circuit 4 in synchronization with the LD 5 (1 in this embodiment)
m) half the distance resolution (0.5 in this embodiment)
m) has a pair of fiber length adjusting optical fibers 15 and 16 different in length, and when driven by the pulse drive circuit 4, any one of the fiber length adjusting optical fibers 15 and 16 is instantaneously attached to the optical fiber 2. Optical switch 14 connected to
And a high temperature tank 17 for keeping the temperature section of the optical fiber 2 constant within a predetermined section (1 m in this embodiment), and first and second APDs (avalanche) for photoelectrically converting the two components separated by the optical demultiplexer 6. (Photo diode) 9, 10 and a high-speed averaging processor 11 for A / D-converting the two photoelectrically converted components and adding them into the memory corresponding to each delay time, A data processing device 12 for calculating temperature distribution information based on output data.

Therefore, in this embodiment, two types of detection paths having different lengths of 0.5 m are provided, and the shorter detection path of the optical fiber 2 is the first route, and the longer detection path is the first route. There are 2 routes. Here, the measuring instrument 23 corresponds to the temperature measuring means, the sprinkling control computer 25 corresponds to the sprinkling control means, and the sprinkling ring pipe 27 and the sprinkling nozzle 28 correspond to the sprinkling means.

Next, the operation of the above embodiment will be described. First, in the measuring instrument 23, the LD is driven by the pulse drive circuit 4.
5 and the optical switch 14 are driven to connect the optical fiber 2 to the optical fiber 15 for fiber length adjustment, and an optical pulse is incident on the first route. By using the interference filters 7 and 8 of the optical demultiplexer 6, the backscattered light generated at each part of the optical fiber 2 is
The first and second APDs 9 and 1 are separated into Stokes light and anti-Stokes light, which are two components of Raman backscattered light.
Photoelectric conversion is performed with 0.

The two components of the Stokes light and the anti-Stokes light, which have been photoelectrically converted, are A / D converted by the high-speed averaging processor 11, and the intensities of the respective components are added to the memory corresponding to each delay time. Store. Next, after all the backscattered light from the first route has returned, the pulse drive circuit 4 is driven, the optical fiber 2 and the fiber length adjusting optical fiber 16 are connected, and the detection route is switched to the second route. A light pulse is incident on two routes, and the Stokes light and the anti-Stokes light, which are the two components of the Raman backscattered light that have returned as described above, are separated, and the intensity of the two components is stored in the memory of the high-speed averaging processor 11. Store inside. This operation is repeated a number of times to store it in the memory of the high-speed averaging processor 11 and divide by the number of repetitions to obtain the first
The averaging process is performed on each of the route and the second route, the intensity ratio of the Stokes light and the anti-Stokes light is calculated, and output to the data processing device 12.

The averaging process is performed to prevent a measurement error because the Raman backscattered light is very weak, and is performed, for example, several thousand times. The data processing device 12 previously has temperature data with respect to the intensity ratio of the Stokes light and the anti-Stokes light, and calculates the intensity ratio between the Stokes light and the anti-Stokes light calculated by the high-speed averaging processing device 11. Based on this, the temperature distribution measurement value is obtained for each of the first route and the second route. The temperature distribution measurement values obtained by the data processing device 12 are two temperature distribution measurement values having a phase shift of 0.5 m as shown in FIGS. 3 and 4.

The measurement start point (reference point of the distance) in the figure is the entrance point P of the constant temperature chamber 17, and, for example, from the speed of the optical pulse in the optical fiber 2 and the distance from the LD 5 to the constant temperature chamber 17. The measurement start point is specified by calculating the delay time of the backscattered light. Further, symbols (T ₁₁ , T ₁₂ , T ₁₃ , ...) In FIG. 3 are 1 in the first route.
The section average temperature for each m is shown, and the symbol (T ₂₁ ,
T _22, T _23, ···) indicates the interval average temperature for each 1m in the second route. Then, the symbol (t
(1, t2, t3, ...) Indicates the section average temperature every 0.5 m, but it has not yet been obtained at this point.

Next, the data processor 12 calculates the section average temperature for every 0.5 m based on these two temperature distribution measurement values for every 1 m. First, in the section between 0 and 1 m on the first route, the optical fiber 2 is placed in the constant temperature bath 17
, The temperature is kept constant, so
The section average temperatures t1 and t2 for every 5 m are the section average temperatures T
It is equal to _11, and t1 = t2 = T _11. Next, since the section average temperature T ₂₁ of the 0.5 to 1.5 m section in the second route is the average value of the section average temperatures t2 and t3, T ₂₁ = (t2 + t3) / 2, from which t3
= A 2T ₂₁ -t2. Here, as described above, t2 = T
_Since it is ₁₁ , t3 = 2T ₂₁ −T ₁₁ is obtained. Similarly, the section average temperature t4 is 1 to 2 m in the first route.
It can be obtained from the section average temperatures T ₁₂ and t3 of the section, and from T ₁₂ = (t3 + t4) / 2, t4 = 2T ₁₂ −t
3 = 2T ₁₂ −2T ₂₁ + T ₁₁ is obtained.

The data processing device 12 will be referred to as t5 and so on.
Subsequent section average temperatures are obtained, summarized in temperature distribution information, and output to the display computer 24 and the sprinkling control computer 25 as the surface temperature distribution of the blast furnace shell 21. On the display computer 24, the temperature distribution information from the data processing device is displayed in different colors for each temperature section. The sprinkling control computer 25 determines whether or not the temperature distribution information from the data processing device 12 exceeds a preset temperature that is arbitrarily set in advance. If the temperature exceeds the preset temperature, based on the position information of the temperature distribution information. The sprinkling ring pipe 27 at the high temperature location is selected, and the automatic water supply valve 26 of the sprinkling ring pipe 27 is opened. As a result, water is sprayed on the iron shell 21 at the high temperature portion, and the temperature of the iron shell surface is lowered by the water spray. In the sprinkling control computer 25, when it is determined from the temperature distribution information from the data processing device that the temperature of the sprinkling point has dropped below the set temperature, the automatic water supply valve 26
Close.

Therefore, by winding the optical fiber 2 around the blast furnace iron shell surface and obtaining the temperature distribution information, the temperature distribution on the iron shell surface can be continuously and easily measured.
Furthermore, when the measured temperature is higher than the set temperature, water is sprinkled, so it is possible to automatically and centrally monitor and protect the furnace body, and reduce the time required for maintenance and inspection work of the blast furnace body. It is possible to reduce the number of operations and work in a bad environment with high heat and a lot of dust.

Further, since the allowance margin 22 is provided in the optical fiber 2 spirally arranged on the surface of the iron shell, the optical fiber 2 can be temporarily retracted at the time of maintenance of the blast furnace body, thus improving work efficiency. You can Further, since the temperature is detected by the optical fiber, the facility cost can be reduced, and since the deterioration is small, the labor and time required for maintaining and managing the optical fiber can be greatly reduced.

In the above embodiment, the optical fibers are arranged spirally on the surface of the iron shell, but the invention is not limited to this, and the optical fibers may be arranged in a plurality of loops. . Further, in the above embodiment, the optical fiber is arranged in direct contact with the blast furnace iron shell, but it is also possible to arrange a stainless steel pipe in the blast furnace iron shell and insert the optical fiber therein. is there.

Further, in the above-mentioned embodiment, water is sprinkled from the entire circumference of the sprinkling ring pipe arranged around the abnormally high temperature portion. However, the sprinkling ring pipe is divided into quarters, for example. It is also possible to sprinkle water only in the vicinity of an abnormally high temperature location by providing an automatic water supply valve for each.

[0025]

As described above, according to the temperature monitoring apparatus for the furnace body of the blast furnace and the temperature control apparatus using the same according to the present invention, the optical fiber is spirally arranged on the surface of the iron shell of the furnace body of the blast furnace. By doing so, it is possible to continuously measure the temperature distribution on the surface of the iron shell and to automatically spray water when the measured temperature distribution information is higher than the set temperature. Water can be automatically sprinkled on and the surface temperature of the skin can be automatically kept below the set temperature. Further, by providing a margin for the optical fiber, the optical fiber can be retracted during maintenance work of the blast furnace, and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a temperature monitoring device for a blast furnace furnace body and a temperature control device using the same according to the present invention.

FIG. 2 is a block diagram showing a configuration of a measuring instrument.

FIG. 3 is a temperature distribution measurement graph in this example.

FIG. 4 is a temperature distribution measurement graph in this example.

[Explanation of symbols]

 1 Blast Furnace Body 2 Optical Fiber 4 Pulse Drive Circuits 15 and 16 Optical Fiber for Fiber Length Adjustment 17 Constant Temperature Bath 21 Iron Cover 22 Margin Allowance 23 Measuring Instrument 24 Display Computer 25 Control Computer 26 Automatic Control Valve 27 Sprinkling Ring Pipe 28 Watering nozzle

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[Procedure amendment]

[Submission date] December 21, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Furthermore, at the same intervals as the arrangement interval of optical fiber 2 are optical fiber 2 around the steel shell 21 which is wound helically, the helix of stages as many sprinkling ring pipe 27 is water
It is arranged flat . This sprinkling ring pipe 27 has iron skin
21 A number of water spray nozzles 2 8 is provided on the inner peripheral surface opposed to, spraying water from water spray nozzles 2 8 steel shell 21.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (3)

[Claims] 1. An apparatus for monitoring the temperature of a blast furnace body for monitoring the temperature of a blast furnace body, comprising: an optical fiber spirally arranged on the surface of an iron shell; and an optical pulse connected to one end of the optical fiber. A temperature monitoring device for a blast furnace body, comprising temperature measuring means for measuring the temperature distribution on the surface of the iron shell from the intensity of the backward Raman scattered light when the light is incident and the returning time. 2. The temperature monitoring device for a blast furnace body according to claim 1, wherein the optical fiber is provided with a margin in the middle of the spiral. 3. The optical fiber spirally arranged on the surface of the iron shell, the backward Raman scattered light intensity when the optical pulse is incident on the optical fiber connected to one end of the optical fiber, and the returning time thereof, Temperature measuring means for measuring the temperature distribution on the surface of the iron skin, and whether or not the temperature distribution information from the temperature measuring means exceeds a set temperature that is arbitrarily set, and when it is determined that the set temperature is exceeded. A temperature control device for a furnace body of a blast furnace, comprising: a sprinkling control means for opening a sprinkling valve at a high temperature location, and a sprinkling means for sprinkling water on the surface of the iron shell controlled by the sprinkling control means.