JP2002038210A - Thickness measuring device for deposit on inner wall of blast furnace and operation method for the furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sensitively detect the abnormal deposition of a deposit 4 on a stave cooler 2 and quickly estimate the fluctuation inside a blast furnace by always monitoring the sedimentary condition of the deposit even in a place using the stave cooler 2 made of copper or copper alloy, in a thickness measuring device for the deposit on the sidewall of a blast furnace body, particularly a furnace wall part in a highly thermal loading portion and an operation method for the blast furnace using the measuring device. SOLUTION: This thickness measuring device 7 for the deposit on the sidewall of the blast furnace is characterized in that the tip of one side of a columnar body made of a heat resistant/wear resistant material is cut in a vertical plane 12 obliquely crossing the axis of the columnar body to make an obliquely cut straight columnar body 1, a plurality of elongated holes 6 are bored parallel with the axis of the columnar body 1 from the face of its other side, and thermometers 5 are inserted into the elongated holes 6. At least one elongated hole 6-5 is passed through the columnar body 1 to measure the pressure inside the furnace. The operation method for the furnace is characterized in that thickness of the deposit on the furnace wall is measured and the condition inside the blast furnace is estimated by arranging a plurality of the thickness measuring devices 7 in both circumferential and height directions of the blast furnace body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a blast furnace furnace side wall,
In particular, the present invention relates to an apparatus for measuring the thickness of deposits on a furnace wall of a high heat load section and a method for operating a blast furnace using the apparatus.

[0002]

2. Description of the Related Art A furnace wall of a blast furnace furnace is constructed by extending a stave cooler having an internal cooling mechanism inside a steel shell. As the stave cooler, a cast-made one is adopted, and generally, the stave cooler is made of cast iron in which a cooling pipe for circulating a cooling medium is disposed.
A plurality of fixed bricks are embedded in the furnace inner surface of the stave cooler at intervals.

Further, as disclosed in Japanese Patent Application Laid-Open No. H11-29312, a stave cooler using copper or a copper alloy instead of cast iron has been employed in order to improve the cooling capacity of the stave cooler. Conventionally, these stave coolers employ a cast iron stave cooler in a low heat load portion 11 having a relatively low load, such as a middle and upper portion of a blast furnace body shaft portion and a tuyere portion. A stave cooler made of copper or a copper alloy is used for the load unit 10, and usage is performed in accordance with the cooling capacity of the stave cooler.

[0004] The cast iron stave cooler employed in the low heat load portion has a lower cooling capacity than the copper and copper alloy stave cooler, so that the portion facing the furnace maintains a relatively high temperature. . For this reason, there is little adhesion of deposits on the surface of the stave cooler, and it is in a state where a change in the furnace condition can be easily detected.

A stove cooler made of copper or a copper alloy employed in a high heat load portion has a characteristic that the stove cooler usually has a temperature of about 70 ° C. and has little temperature fluctuation because of its high cooling ability.

[0006] For this reason, on the surface of a copper or copper alloy stave cooler employed in a high heat load portion, adhesion of the melt in the furnace and deposits of iron ore powder adhere, and the deposits grow. A self-learning phenomenon occurs that protects the stave cooler body from thermal shock and wear. This self-fringing results in a longer life of the stave cooler.

[0007] In a cast iron stove cooler, the thermal load in the blast furnace can be estimated by measuring the temperature fluctuation of the stave cooler itself. But,
Since a copper or copper alloy stave cooler has a small temperature change itself, it was not possible to estimate the heat load condition in the furnace based on the temperature fluctuation of the stave cooler itself as in the case of the cast iron stave cooler. For this reason, it was late to detect a change in the condition inside the furnace, and there was a tendency for the reactor to be in an unsatisfactory condition or to operate at a high fuel ratio at least to avoid it.

[0008] Further, when the deposits attached to the furnace wall grow rapidly due to the accumulation of ore powder or the like, the lowering of the in-furnace logistics and the rise of the gas flow are hindered, and shelves are suspended and slips are induced. If large deposits fall off as well as the property of dropping, it is feared that the tuyere may be damaged and the blast furnace may be shut down.

Therefore, in order to pursue a stable and low fuel ratio operation of a blast furnace using a copper and copper alloy stave cooler, the formation state of deposits on the furnace wall is constantly monitored and the layer thickness tends to increase. It is necessary to take immediate action upon detecting this, and it has been desired to develop an apparatus for measuring the thickness of attached matter.

[0010] Japanese Patent Application Laid-Open No. 57-5 / 57 discloses this attached matter measuring device.
No. 7809 is disclosed. JP-A-57-578
No. 09 discloses that a thermometer is inserted into a blast furnace wall from a through hole penetrating to the inside of the furnace, a tip of the thermometer is protruded to a certain length inside the furnace, and the temperature is measured by the thermometer. There has been proposed a technique for detecting the presence or absence of a deposit on a furnace wall by detecting the disappearance of the periodic fluctuation when the measured value periodically fluctuates according to the raw material charging cycle.

[0011] Japanese Patent Application Laid-Open No. 05-1313 discloses that
The furnace wall brick of the blast furnace was divided into a number of sections, and the depth of embedding of the thermocouple tip was varied in the brick layer at each division position.
An apparatus has been proposed in which a plurality of thermocouple thermometers are installed, and the thickness of the deposit is obtained by calculation from the measured temperature values.

Japanese Patent Application Laid-Open No. 08-81707 discloses a blast furnace having a plurality of temperature measuring sections in the thickness direction of the refractory wall, at least one of which is projected into the blast furnace and at least one is disposed in the refractory. Frequency analysis of the time-series data of each temperature measurement value, extract the fluctuation intensity of the frequency component equal to or higher than a predetermined value, and analyze the fluctuation of the measurement unit located in the refractory. There has been proposed a detection method and apparatus for determining whether or not each of the measurement units is in the deposit based on the intensity.

[0013]

SUMMARY OF THE INVENTION Japanese Patent Laid-Open No. 57-5780
In the method described in Japanese Patent Application Laid-open No. 9, since the tip of the thermometer protrudes into the furnace, the tip is exposed to the high temperature in the furnace, and the ore or coke falling is worn away. Life is short. Further, the thickness of the attached matter is only known when the thickness exceeds the protruding length of the thermometer, and the thickness of the attached matter cannot be measured continuously.

In the apparatus described in Japanese Patent Application Laid-Open No. 05-1313, a plurality of thermometers are buried in a refractory constituting a furnace wall to measure the thickness of a deposit, and a stove cooler system made of copper and a copper alloy is used. Can not be adopted because refractory is not used for the furnace wall.

Japanese Patent Application Laid-Open No. 08-81707 uses the characteristic of temperature fluctuation that has a high level of signal processing and has a large temperature fluctuation in the measuring part protruding into the furnace, but rapidly decreases in the deposits and refractories. Therefore, the method cannot be applied to a stove cooler type furnace wall made of copper or a copper alloy which does not use a refractory material for the furnace wall.

[0016]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and the gist thereof is as follows. (1) In a measuring device for measuring the thickness of deposits adhered to a blast furnace wall, one end of a cylindrical body made of a heat-resistant and abrasion-resistant material is cut along a vertical plane 12 oblique to an axis of the cylindrical body. To form a plurality of small holes 6 in parallel with the axis of the slant-cut straight cylinder 1 from the other surface of the slant-cut straight cylinder 1,
A blast furnace furnace wall deposit thickness measuring device, wherein a thermometer 5 is inserted into the pores 6. (2) At least one of the plurality of pores is a pore that penetrates the obliquely cut straight cylindrical body 1 (1).
The blast furnace wall adhering matter measuring device according to item 1. (3) The thickness of the blast furnace furnace wall adhering material according to (2), wherein a pressure gauge for measuring the gas pressure in the furnace and a thermometer 5 for measuring the temperature are juxtaposed on the obliquely cut straight cylindrical body 1. measuring device. (4) The blast furnace furnace according to any one of the above (1) to (3), wherein the blast furnace wall adhering material thickness measuring device 7 is disposed on a furnace wall composed of a copper or copper alloy stave. Wall thickness measurement device. (5) A plurality of the blast furnace furnace wall thickness measuring devices 7 according to any one of the above (1) to (3) are provided in a circumferential direction and a height direction of the blast furnace furnace body, and the blast furnace furnace wall thickness is measured. A method for operating a blast furnace, comprising measuring a thickness of a substance attached to a furnace wall based on a furnace pressure and a furnace gas temperature detected by a thickness measuring device 7 and estimating a furnace state of the blast furnace.

[0017]

FIG. 1 shows an embodiment in which a deposit thickness measuring device 7 of the present invention is arranged in a blast furnace high heat load section 10, and FIG. 2 shows a partial cross section of the deposit thickness measuring device showing an embodiment of the present invention. FIG. 3 is a perspective external view of the attached matter thickness measuring device 7, FIG. 4 is a layout diagram of the pores 6, and FIG.
(B) is another example, and FIG. 5 is an example of temperature measurement by the attached matter thickness measuring apparatus of the present invention.
Is an example of a temperature change when an attached substance starts to grow in a temperature measurement example by the attached substance thickness measuring apparatus of the present invention.

In FIG. 1, a copper and copper alloy stave cooler 2 employed in a high heat load portion 10 of a blast furnace furnace body 2
The apparatus is provided with the attached matter thickness measuring device 7 of the present invention at a predetermined position in the high heat load unit 10 of the blast furnace at a predetermined interval in the circumferential direction. 3 in 1). In FIG. 1, the low heat load unit 11
Is provided with a stave cooler 2a made of cast iron.

FIG. 2 shows the details of the attachment portion where the attached matter thickness measuring device 7 of the present invention is installed. In FIG. 2, the furnace wall structure of the present invention is employed between a copper and copper alloy stave cooler 2. FIG. 2 shows a sectional view thereof, and FIG.
1 shows a perspective external view of the attached matter thickness measuring device 7 of the present invention.
One end of a cylindrical body made of a heat-resistant and abrasion-resistant material is cut at a vertical plane 12 oblique to the axis of the cylindrical body to form the obliquely cut straight cylindrical body 1. A plurality of pores 6 are drilled from the surface on the other side of the obliquely cut straight cylindrical body 1. Of the plurality of perforated pores 6, one of the pores 6-5 passes through the obliquely cut straight cylindrical body 1. A pressure gauge is installed in the penetrated pore 6-5, and the pressure inside the furnace is detected by the pressure gauge. The remaining pores (6-1 to 6-4) are perforated to near the vertical plane 12, but do not penetrate. Since one surface (vertical plane 12) of the obliquely cut straight cylindrical body 1 is inclined with respect to the axis of the cylindrical body, the perforated pore 6 has a perforated length of from the pore 6-4 to the pore 6-6. It gradually decreases toward -1. Then, the thermometer 5 is inserted into the small holes 6 not penetrated.
FIG. 2 shows a situation where the thermometer 5 is inserted into the fine holes 6-1 and 6-4. The obliquely-cut straight cylindrical body 1 thus configured is inserted from outside the furnace toward the inside of the furnace. During insertion, the inclined surface (vertical plane 12) is inserted to the side.
Further, the pores 6 are pierced at equal intervals in the circumferential direction of the furnace. With such a configuration, an attached matter thickness measuring device is obtained.

The heat-resistant and wear-resistant material used for the obliquely cut straight cylindrical body 1 is ceramic or heat-resistant cast steel (SCH2).
2 etc.) can be used. The reason why the oblique cut surface of the obliquely cut straight cylindrical body 1 is a vertical plane is that by making it vertical, it is possible to prevent the furnace contents from being deposited on the upper surface of the attached matter thickness measuring device 7.

As shown in FIG. 2 as the deposit 4, the deposit 4 usually adheres to the surface of the copper and copper alloy stave cooler 2, and the deposit thickness measuring device 7.
Is not covered with the deposit and is close to the furnace contents.
The indicated value of the thermometer 5 provided in the pore (the pore 6-1 in FIG. 2) located at the site where the tip of the pore is covered with the deposit 4 is low, and the temperature fluctuation is small. On the other hand, the thermometer 5 disposed at the pores (pores 6-1 to 6-4 in FIG. 2) at the site where the tip of the pores is not covered with the deposit 4 and is close to the contents of the furnace does not include the furnace. Sensitively detects temperature changes in the interior.

FIG. 4 shows an example of the arrangement of the pores 6. FIG.
(A) is a view on arrow AA in FIG. 2, in which fine holes 6 are arranged at equal intervals in one row in the horizontal direction. FIG.
Are arranged on the circumference of the obliquely cut straight cylinder 1. Any method may be used as long as a plurality of the deposit thickness measuring devices 7 can be arranged at equal intervals in the circumferential direction and the height direction of the furnace.

FIG. 5 shows an example of a temperature change measured by the thermometer 5 inserted into the fine holes 6-1 to 6-4. The horizontal axis indicates time, and the vertical axis indicates temperature. T1 to T4 are measured values measured by a thermometer inserted into the pores 6-1 to 6-4, respectively. The temperature fluctuation is small at the temperature measurement value T1, and the temperature fluctuation is large at T2. From this, the position of the inside of the furnace of the deposit 4 attached to the furnace wall is
-1 (L1 in FIG. 2) and the tip of the pore 6-2 (L2 in FIG. 2). If the perforation lengths of the pores are set in advance as shown in FIG.
And the thickness of the deposit is estimated.

FIG. 6 is a graph showing the temperature change of each thermometer as in FIG. 5, and shows the temperature state when the deposits in the furnace start to grow rapidly. When the in-furnace deposits grow to near the tip positions of the thermometer 5 of the pore 6-3 and the thermometer 5 of the pore 6-4, the temperatures of T3 and T4 shown in FIG. Becomes smaller. From this, it can be inferred that the deposits in the furnace grew rapidly due to the deposition and deposition of ore powder, and if left untouched, it would eventually impede the flow down in the furnace, hinder the gas flow, and cause a furnace condition malfunction. become. If such a large deposit 4 is peeled off, the tuyere may be damaged, and not only the wind must be stopped, but also if the countermeasure is delayed, there is a possibility that the tuyere may become cold. When the growth of the attached matter 4 is detected by the attached matter thickness measuring device 7 of the present invention, by taking quick action, it is possible to prevent a calm or a cold from occurring.

Furthermore, by installing the attached matter thickness measuring device 7 of the present invention at a plurality of locations in the circumferential direction and the height direction of the blast furnace body, the thickness of the attached matter on the entire high heat load section 10 is monitored and at the same time, the inside of the furnace is monitored. By measuring the gas temperature and the gas pressure in the furnace, abnormal changes in the gas temperature in the furnace and abnormal changes in the gas pressure difference in the height direction can be detected without delay, and rapid improvements can be made to maintain stable operation of the blast furnace. Further, the production cost of the hot metal can be reduced by pursuing a low fuel ratio.

[0026]

As described above, the condition of the growth of the deposits grown on the surface of the copper or copper alloy stave cooler can be constantly monitored and the abnormal growth can be detected sensitively by the deposit thickness measuring device of the present invention. In addition, fluctuations in the furnace can be quickly estimated. Further, since a change in the furnace condition can be detected promptly without delay, stable operation of the blast furnace can be maintained, and further, a low fuel ratio can be pursued to reduce the production cost of hot metal.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a blast furnace, showing a state in which an attached matter thickness measuring device of the present invention is arranged in a blast furnace high heat load section.

FIG. 2 is a partial plan sectional view showing an attached matter thickness measuring device of the present invention.

FIG. 3 is a perspective external view of the attached matter thickness measuring apparatus of the present invention.

4A and 4B are arrangement diagrams of pores in the attached matter thickness measuring apparatus of the present invention, wherein FIG. 4A is a view taken along the line AA in FIG. 2 and FIG. 4B is another embodiment.

FIG. 5 is an example of temperature measurement by the attached matter thickness measuring device of the present invention, in which the inside of the blast furnace is in a normal state.

FIG. 6 is an example of temperature measurement by the attached matter thickness measuring device of the present invention, and is an example of a temperature change when the attached matter starts to grow.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oblique straight cylinder 2 Copper or copper alloy stave cooler 2a Cast iron stave cooler 3 Iron shell 4 Deposit 5 Thermometer 6 Pores 7 Deposit thickness measuring device 8 Insulation material 10 High heat load part 11 Low heat load part 12 Vertical Plane T Temperature measured value

Claims (5)

[Claims] 1. A measuring apparatus for measuring the thickness of a substance adhering to a blast furnace wall, wherein one end of a cylindrical body made of a heat-resistant and abrasion-resistant material is cut at a vertical plane oblique to an axis of the cylindrical body. And obliquely cut straight cylindrical body, from the other surface of the obliquely cut straight cylindrical body perforated a plurality of pores in parallel with the axis of the obliquely cut straight cylindrical body,
A blast furnace wall adhering matter thickness measuring device, wherein a thermometer is inserted into the pores. 2. The apparatus according to claim 1, wherein at least one of the plurality of fine holes is a fine hole penetrating a straight obliquely cut cylindrical body. 3. The blast furnace wall thickness measurement according to claim 2, wherein a pressure gauge for measuring the gas pressure in the furnace and a thermometer for measuring the temperature are juxtaposed on the obliquely cut straight cylindrical body. apparatus. 4. A blast furnace furnace wall according to claim 1, wherein said blast furnace furnace wall deposit thickness measuring device is disposed on a furnace wall composed of a copper or copper alloy stave. Kimono thickness measuring device. 5. A blast furnace wall deposit thickness measuring device according to claim 1, wherein a plurality of the blast furnace wall deposit thickness measuring devices are arranged in a circumferential direction and a height direction of the blast furnace furnace body. A method for operating a blast furnace, comprising measuring a thickness of a substance attached to a furnace wall based on a furnace pressure and a furnace gas temperature detected by an apparatus and estimating a furnace state of the blast furnace.