JPH0572048A - Temperature measuring probe at lower part of blast furnace - Google Patents

Abstract

PURPOSE:To obtain a probd, which satisfies safety, simplification of a structure, low cost, easy manufacture and mechanical strength in a non-water cooling heat insulating mechanism in order to measure the temperature of the lower part of a blast furnace. CONSTITUTION:This probe is constituted of the parts having the following structures. An inner pipe 7 comprises heat insulating matertial such as paper. A tube-shaped body 6 of probe is constituted of the laminated structure of the inner pipe 7 and an outer pipe 8 comprising heat resisting metal material. A temperature measuring means 9 is made to protrude to the tip of the body 6 and fixed. A proterting cap 10 is attached to the tip part of the probe body 6 so that the cap is freely attached and removed and surrounds the temperature mesuring means 9. The temperature measuring means 9 is constituted of a thermocouple 13 housed in a U-shaped protecting pipe 12 and a supporting body 14 comprising an insulator which supports the thermocouple 13. The supporting body 14 is inserted into the probe body 6. The tip part of the probe body 6 reaches the supporting body 14 through the tip surface of the probe body 6 from the outer surface of the outer pipe 8. The tip part is sealed with a sealing material 24 in an airtight mode. The protecting cap 10 is externally applied around the outer surface region of the tip of the probe body 6 so that the cap is freely attached and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a probe for measuring the temperature of the lower part of a blast furnace, particularly the core of a furnace filled with coke when there is no wind.

[0002]

2. Description of the Related Art The upper part of a blast furnace is kept at a relatively low temperature of about 1,000 degrees Celsius or less, but the lower part of the blast furnace, especially the core of the blast furnace, has a temperature of 1,200 ° C. ~ 1,5
It is set to a high temperature of 00 degrees Celsius.

Therefore, conventionally, as a temperature measuring probe for the lower part of the blast furnace, particularly for the core of the blast furnace, the one disclosed in Japanese Utility Model Publication No. 55-35535 is known. This probe uses a water-cooled triple metal protection tube, and inserts a non-consumable probe containing a sheath-type or non-sheath type platinum thermocouple throughout the probe into the furnace core from the tuyere to measure the temperature. Is going. This probe employs a structure in which the temperature measuring means is provided at the tip of the probe so that the temperature measuring means can be freely retracted and retracted, and after inserting the tip of the probe into the core of the furnace, the temperature measuring means is projected from the tip of the probe.

The probe disclosed in Japanese Utility Model Laid-Open No. 58-30839 is a non-water-cooled type in which a refractory heat insulating material is filled between a metal outer tube and an inner tube, and a thermocouple is housed in the entire probe. It is a consumable type probe and is supposed to measure the temperature by inserting the probe into the furnace core through the tuyere.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the probe of Japanese Patent No. 35535 is water-cooled, it is necessary to have a high-strength structure as a whole in order to ensure safety, and there is a problem that the probe is large and costly. That is, when the probe is inserted from the tuyere toward the furnace core, there is a large resistance due to the coke grains, so even if the preliminary hole is formed by a jig in advance, about 1.
Insertion thrust of 0 to 5.0 tons is required, and if the probe breaks during insertion and leaks cooling water, not only will the temperature inside the furnace be adversely affected, but there is also the risk of personal injury due to steam explosion. is there.

On the other hand, according to the probe of Japanese Utility Model Laid-Open No. 58-30839, the structure can be made smaller and the cost can be provided at a relatively lower cost than that of the water-cooled type, but the thermocouple is housed over the entire probe. Therefore, it is necessary to use a thermocouple having an insertion length (several meters) up to the core of the furnace. Moreover, as a result of using the platinum thermocouple, the cost is still inevitable.

[0007] Therefore, as a result of pursuing safety and cost reduction by simplifying the structure, the inventors of the present invention determined that the water-cooled type by circulating the refrigerant was unsuitable, and developed a probe having an adiabatic structure. I decided it should.

By the way, when the heat insulating structure of the probe is required, various structures can be adopted. However, the inventors of the present invention have a low cost, and the assembly at the time of manufacturing the probe is as easy as possible. In addition, as a result of intensive research aimed at satisfying the conditions such as having the strength capable of withstanding the large insertion thrust when inserted into the furnace, as a result of the above-mentioned Japanese Utility Model Laid-Open No. 58-30839. It is not a good idea to fill the entire area of the probe between the inner and outer tubes with a refractory insulation material, instead of an integral inner tube made of a heat insulating material such as a paper tube and an outer tube made of a heat-resistant metal material. It has been found that it is most advantageous to construct a tubular probe body according to the structure.

However, in the case where the inner tube is constituted by the paper tube as described above, on the other hand, while having the above-mentioned advantages, when the experiment is carried out by inserting the inner tube into the furnace,
We faced the new problem that gases such as combustion gas and water vapor are generated from the paper tube in a high temperature atmosphere. This problem is because, particularly when the temperature measuring means of the probe is constituted by a thermocouple, the gas adversely affects the electromotive force generation around the thermocouple, resulting in an error in the temperature measurement result.

Therefore, in order to solve the problem caused by gas, it is necessary to provide a sealing means for isolating the gas generating region from the paper tube and the temperature measuring means. in this regard,
The inventors of the present invention have described that since the temperature measuring unit is configured to be retractable at the tip of the tube-shaped probe main body as in the above-mentioned Japanese Utility Model Publication No. 55-35535, a sliding portion is required. It is not preferable to secure the sealing property, and therefore, the temperature measuring means provided at the tip of the tube-shaped probe body is projected and fixed from the body, and the tip portion of the probe body is sealed under this structure. It turns out that the configuration is the most advantageous.

By the way, in the structure in which the temperature measuring means is projected at the tip, a protection means is required for preventing the temperature measuring means from being damaged when the probe main body is inserted into the furnace. In this regard, the present inventors detachably attach a protective cap for protecting the temperature measuring means to the tip of the probe main body, and the protective means is protected by the protective cap while the probe main body is inserted into the furnace. Meanwhile,
It has been found that it is most preferable that the probe main body is retracted slightly in the furnace after the insertion into the furnace so that the protective cap is detached from the probe main body, and thereby the temperature measuring means is exposed. Further, in the configuration in which the temperature measuring means is projected at the tip as described above, the configuration in which the protective cap is formed in a hollow cup shape and the protective cap is detachably fitted to the outer peripheral area of the tip of the probe body is most suitable. I knew that it was advantageous.

[0012]

In order to solve the above-mentioned problems, the present invention has a laminated structure of an inner tube made of a heat insulating material such as paper and an outer tube made of a heat-resistant metal material. It is composed of a tube-shaped probe main body configured, a temperature measuring means protruding and fixed to the tip of the probe main body, and a protective cap detachably attached to the tip of the probe main body and surrounding the temperature measuring means. , The temperature measuring means,
It is composed of a thermocouple housed in a U-shaped protection tube and a support body made of an insulator that supports the thermocouple, and the support body is inserted into the probe body.
From the outer peripheral surface of the outer tube, through the tip surface of the probe main body, to the support, and to be hermetically sealed by a sealing material, the protective cap is detachably fitted onto the outer peripheral area of the tip of the probe main body. It consists of

In the additional configuration of the present invention, it is preferable that the inner tube forming the probe body is impregnated with a liquid, and the gas generated inside the probe body near the tail end of the probe body is removed from the furnace. It is preferable to provide a degassing means for discharging the gas. Further, it is preferable that the protective cap has an outer peripheral portion formed with a cap-shaped tip portion having an outer diameter larger than the outer diameter of the protective cap.

[0014]

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 4, the temperature measuring probe 1 of the present invention has a tuyere 3 to a cohesive zone 3 of a blast furnace 2 when there is no wind.
0 through the core surface layer portion 31 located below the core core portion 4
It is inserted into the lower part of the furnace including and the temperature of the furnace core part 4 or its vicinity is measured. At the time of insertion, a jig made of a rod, a pipe or the like is previously inserted from the tuyere 3, so that the preliminary hole is passed from the tuyere 3 through the surface layer portion 31 of the core to the lower part of the furnace including the core 4. Is formed, and the probe 1 is inserted through this preliminary hole. The distance from the tuyere 3 to the surface layer of the furnace core is usually about 2 to 3 m, and therefore the total length of the probe 1 is about 5 m. Since the temperature of the furnace core part 4 is 1,200 to 1,500 degrees Celsius even when there is no wind, it is important to insert the probe and stop it after the insertion within a short time (within about 2 minutes). Is.

As shown in FIGS. 1 and 2, the probe body 6
Is a tubular shape constituted by a laminated structure of an inner pipe 7 and an outer pipe 8. The inner pipe 7 has a double structure of an inner layer pipe 7a and an outer layer pipe 7b. The inner tube 7 is made of a heat insulating material such as paper, and is preferably an inner layer tube 7a and an outer layer tube 7b.
Both of them are made of paper tubes. On the other hand, the outer tube 8 is
It is made of heat resistant metal such as stainless steel.

A temperature measuring means 9 is projected and fixed to the tip of the probe body 6, and the temperature measuring means 9 is surrounded by a protective cap 10. At the tail end of the probe main body 6, a screw type coupling 11 which is attachable to the insertion device 5 is provided.

The temperature measuring means 9 comprises a platinum-platinum-rhodium alloy type thermocouple 13 housed in a U-shaped protective tube 12 made of a quartz tube, and an insulator supporting the thermocouple 13 together with the U-shaped protective tube 12. And a support body 14 which is composed of
From the tip of the probe body 6 to the inner layer tube 7a.
It is fitted and fixed in. In order to reduce the amount of wires used in the thermocouple 13 and to make the structure inexpensive, the wires of the thermocouple 13 inserted from the tubular portion 14a are connected to the lead wires 15,
The lead wire 15 is guided along the inside of the probe body 6. The portion near the tail end of the probe main body 6, that is, the portion located outside the furnace at the time of temperature measurement is composed of only the outer tube 8, and the outer tube 8 is protruded by the guide cylinder 17 via the lead wire guide hole 16. A connector 19 is connected to the guide cylinder 17 via a connector 18. Therefore, although not shown, the lead wire 15 is connected to the connector 19 through the guide hole 16, and the thermocouple 13 is connected through the connector 19.
The electromotive force of is output to the outside. The U-shaped protection tube 12 accommodating the thermocouple 13 is surrounded by a cup-shaped auxiliary cap 20 made of a thin metal plate such as aluminum, and the auxiliary cap 20 is supported by the flange 14b of the support body 14. There is.

In the vicinity of the tip of the probe body 6, a space between the inner pipe 7a and the outer pipe 8 of the inner pipe 7 is filled with a heat insulating inorganic cushioning material 21 instead of the outer pipe 7b. That is, the outer layer tube 7b made of the paper tube ends at a position that does not reach the vicinity of the tip of the probe main body 6, and the space between the inner layer tube 7a and the outer tube 8 formed by this is filled with the inorganic cushioning material 21. To be done. The inorganic cushioning material 21 is made of, for example, ceramic fiber and has elasticity, and forms an inward flange portion 21a extended so as to cover the tip end surface of the inner layer pipe 7a. The outer periphery of the cylindrical portion 14a of the support 14 is held by 21a. As a result, shock or vibration generated when the probe 1 is inserted into the furnace is transmitted from the outer tube 8 through the outer layer tube 7b to the support 1
4 and prevents the U-shaped protective tube 12 and / or the thermocouple 13 from being damaged.

A connecting member 22 made of a nail or the like is provided in a region of the probe body 6 filled with the inorganic cushioning material 21. A plurality of the connecting members 22 are provided at positions very close to the temperature measuring means 9 side at intervals in the circumferential direction, penetrate the inorganic cushioning material 21 from the outer tube 8 and are pierced by the inner layer tube 7a. The outer pipe 8 and the inner pipe 7a are connected and fixed so that their positions are not displaced in the axial direction. In other words, if this connecting member 22 is not provided, the inner layer tube 7a made of paper tube that heats up in a high-temperature atmosphere contracts when the probe 1 is inserted into the furnace, which causes the temperature measuring means 9 to operate. A gap is generated between the support 14 and the inner layer tube 7a, and the gas generated from the paper tube inside the probe body 6 is ejected from the tip of the probe body 6 to the periphery of the thermocouple 13 through this gap. There is a risk of doing it. On the other hand, the connecting member 2
According to the configuration provided with 2, the inner layer tube 7a is prevented from contracting on the temperature measuring means 9 side, and the above-described gap can be prevented from occurring.

At the tip of the probe body 6, the outer tube 8
Has a groove 23 cut from the outer peripheral portion to the tip, and the groove 23 is filled with a sealing material 24. This seal material 2
4 is made of a heat insulating material such as refractory cement and is filled in the groove 23 so that the outer peripheral surface is formed substantially flush with the outer peripheral surface of the outer tube 8 and the inorganic buffer material 21 is directed inward from the tip of the outer tube 8. A seal portion 24a that covers the outer periphery of the flange portion 21a and covers the outer periphery of the flange 14b of the support 14 is formed.
As a result, the tip portion of the probe body 6 is hermetically sealed from the outer peripheral surface of the outer tube 8 to the support body 14, and the gas generated from the paper tube inside the probe body 6 reaches the tip of the probe body 6. Prevent spurting.

In order to fit the protective cap 10 onto the outside, a seat tube 25 is provided which surrounds the tip portion of the probe body 6, that is, the outer circumference from the outer tube 8 to the tip of the sealing material 24. The seat tube 25 is made of a heat-resistant metal material such as stainless steel, and is fixed to the outer tube 8 by welding or the like. Therefore, the protective cap 10 can be removably fitted on the seat tube 25. The stopper tube 2 made of a heat-resistant metal material such as stainless steel is provided on the outer periphery of the seat tube 25 in order to form a stopper for the protective cap 10 fitted on the outside.
6 is extrapolated and fixed by welding or the like. The seat tube 25 and the stopper tube 26 are used for the protection cap 10.
The main purpose is to insert the
3 and the compensation contact portion 13a of the lead wire 15 are protected from the outside and also have a function of preventing the temperature rise of the compensation contact portion 13a as much as possible. In other words, by this, the compensation contact portion 1
3a is an inner layer pipe 7a, an inorganic cushioning material 21,
The outer tube 8, the seal member 24, the seat tube 25, and the stopper tube 26 are protected by a multi-layered structure including six layers.

The protective cap 10 is made of a heat-resistant metal material such as steel and is formed in a cup shape, and it is preferable to form a spherical or conical streamlined portion 10a at the tip end portion as shown in the drawing, but the tip end portion is preferable. May be formed on a flat surface. As described above, the protective cap 10 includes the tubular portion 10b and the seat tube 25.
While being externally fitted, the end of the tubular portion 10b is brought into contact with the end of the stopper tube 26, and the temperature measuring means 9 is surrounded in this state. While the probe 1 is inserted into the furnace, the protection cap 10 is supported by the stopper tube 26 and set in a predetermined position. However, when the probe 1 is retracted after the insertion, the protection cap 10 is protected by the resistance of the coke lump of the furnace core 4. The tip portion of the probe main body 6 is pulled out from the cap 10, that is, the protective cap 10 is dropped to expose the temperature measuring means 9. Therefore, in order to ensure that the protective cap 10 comes off, as shown in FIG. 3, a cap-shaped tip portion 27 having an outer diameter larger than the outer diameter of the protective cap 10 is provided on the outer peripheral portion of the protective cap 10. It is preferable to provide the tip portion 27, and the tip portion 27 may have various shapes other than the bulky shape as shown in the drawing.

The portion near the tail end of the probe body 6, that is, the portion located outside the furnace at the time of temperature measurement, is composed of only the outer tube 8 as described above, and the outer tube 8 is provided inside the probe body 6. A degassing means 28 for discharging the gas generated from the paper tube to the outside of the furnace is provided. In FIG. 1, the gas venting means 28 shows a gas venting hole 29 opened in the outer pipe 8, but a suction means composed of a steam ejector or a suction pump connected to the gas venting hole 29 may be constituted. preferable.

Although not shown, it is preferable that the inner layer tube 7a and / or the outer layer tube 7b made of paper tube constituting the inner tube 7 be impregnated with a liquid to contribute to the prevention of temperature rise.
The liquid may be water, but is preferably selected from oils having a boiling point of about 150 degrees Celsius, for example.

According to the above-described embodiment, when the blast furnace 2 is in a resting state, the probe 1 is inserted by the insertion device 5 from the tuyere 3 to the furnace core portion 4.
The temperature of the lower part of the furnace including the core part 4 can be measured by inserting it into the lower part of the furnace including. As described above, a large shock or vibration is applied to the probe main body 6 at the time of insertion, but the shock and vibration to the temperature measuring means 9 are suitably buffered by the inorganic buffer material 21, so that the U-shaped protective tube 12 is not affected. There is no breakage or breakage of the thermocouple 13 or the lead wire 15. During this insertion, the protective cap 10
It is attached to the tip of the probe body 6 and is supported by a stopper tube 26 to protect the temperature measuring means 9.

When the tip of the probe 1 enters a predetermined position in the furnace, the insertion is stopped and then the probe 1 is slightly retracted. As a result, the probe body 6 is pulled out from the protection cap 10 while the protection cap 10 is placed inside the coke grains, so that the temperature measuring means 9 is exposed at the tip of the probe body 6. At this time, since the temperature measuring unit 9 has the auxiliary cap 20, the thermocouple 13 can be protected from the coke that collapses immediately after the protective cap 10 is dropped. After that, the auxiliary cap 20 is melted away, but the thermocouple 13
Responds in about several tens of seconds to stabilize the electromotive force and obtain a predetermined temperature measurement result. At this time, the temperature measuring means 9
Since it is projected from the tip of the probe body 6,
Excellent responsiveness. Moreover, as described above, the temperature measurement accuracy can be assured because it is configured so as not to be affected by gas.

During the temperature measurement, the temperature of the probe main body 6 can be raised as a whole, but the temperature rise rate can be suppressed as much as possible by impregnating the paper tube with the liquid as described above. .. Gas such as combustion gas or steam is generated from the paper tube forming the inner tube 7 as the heat becomes higher, and such gas is suitably discharged to the outside of the furnace through the gas venting means 28. Moreover, at the tip of the probe body 6, the outer tube 8
Since the seal member 24 hermetically seals between the support 14 and the support 14, such a gas does not leak toward the thermocouple 13. Further, the inner tube 7a made of paper tube which constitutes the inner tube 7 tends to shrink due to high heat, but at least in the vicinity of the tip of the probe body 6, the inner tube 7a is connected and fixed to the outer tube 8 by the connecting member 22. Therefore, there is no deviation in the contraction direction, and the sealing performance of the sealing material 24 is not impaired.

When the temperature measurement is completed, the probe 1 is pulled out from the furnace by the insertion device 5, and the work is completed.

[0030]

According to the present invention as set forth in claim 1, it is based on a tubular probe body having a laminated structure of an inner tube made of a heat insulating material such as paper and an outer tube made of a heat-resistant metal material. Therefore, under the non-water-cooled insulation structure,
It is possible to provide a probe that satisfies both safety and low cost requirements due to the simplification of the structure, that is, relatively easy to assemble at the time of manufacturing the probe, and that can withstand the thrust force when inserted in the furnace.

At the tip of the probe body,
Not only does the responsiveness of the temperature measuring device improve by making the temperature measuring device protrude, but it also occurs when the paper material that constitutes the probe main body heats up due to the airtight sealing by the sealing material. The temperature measuring means can be protected from the gas and the temperature measuring accuracy can be guaranteed.

In this respect, since the protective cap is removably fitted on the outer peripheral region of the tip of the probe main body, the complete sealing by the sealing material and the protruding structure of the temperature measuring means can be realized. Moreover, the protection of the temperature measuring means by the protective cap during insertion into the furnace and the removal of the protective cap after insertion into the furnace can be realized with a simple structure.

According to the second aspect of the present invention, it is possible to provide a probe having excellent heat insulation by suppressing the temperature rising rate of the probe body as much as possible.

According to the third aspect of the present invention, by discharging the gas generated inside the probe main body to the outside of the furnace, it is possible to more reliably achieve the purpose of protecting the temperature measuring means from the gas. it can.

According to the fourth aspect of the present invention, it is possible to surely and easily remove the protective cap from the probe main body after the insertion into the furnace.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view showing a tip portion of a probe main body in a state in which a protective cap is removed.

FIG. 3 is a vertical cross-sectional view showing a modified embodiment of the protective cap.

FIG. 4 is an explanatory view showing a state in which a temperature measuring probe is inserted into a furnace core portion from tuyere in a blast furnace.

[Explanation of symbols]

 1 Probe 2 Blast Furnace 3 Tuyere 4 Furnace Core 5 Insertion Device 6 Probe Body 7 Inner Tube 7a Inner Layer Tube 7b Outer Layer Tube 8 Outer Tube 9 Temperature Measuring Device 10 Protective Cap 12 U-Type Protective Tube 13 Thermocouple 14 Support 15 Lead Wire 20 Auxiliary Cap 21 Inorganic Cushioning Material 22 Connecting Material 24 Sealing Material 28 Degassing Means 30 Fusion Zone 31 Furnace Core Surface Layer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Kenji Yamane, 5-3 Tokai, Tokai-shi, Aichi Pref.Nippon Steel Works (72) Inventor, Hidenori Yoshimitsu 5--3, Tokai, Tokai-shi, Aichi Nippon Steel Co., Ltd.Nagoya Steel Works (72) Inventor Ikuhei Sakaguchi 1-7-10 Nishihonmachi, Nishi-ku, Osaka City, Osaka Prefecture Kawaso Electric Industry Co., Ltd. 1-7-10 Honmachi Kawaso Electric Co., Ltd. (72) Inventor Toshiyuki Kitaura 1-7-10 Nishihonmachi Nishi-ku, Osaka City, Osaka Pref. Kawaso Electric Co., Ltd.

Claims (4)

[Claims] 1. A tube-shaped probe main body composed of a laminated structure of an inner tube made of a heat insulating material such as paper and an outer tube made of a heat-resistant metal material, and a temperature measuring device projectingly fixed to the tip of the probe main body. And a protective cap that is detachably attached to the tip of the probe body and that surrounds the temperature measuring means. The temperature measuring means includes a thermocouple housed in a U-shaped protective tube and the thermocouple. A support body made of an insulator that supports the support body, and the support body is inserted into the probe body. The tip portion of the probe body is formed from the outer peripheral surface of the outer tube through the tip surface of the probe body to the support body. According to another aspect of the present invention, there is provided a temperature measuring probe in a lower portion of a furnace of a blast furnace, wherein the protective cap is hermetically sealed by a sealing material, and the protective cap is detachably fitted to an outer peripheral region of a tip of a probe body. 2. The temperature measuring probe in the lower part of the blast furnace according to claim 1, wherein the inner tube forming the probe main body is impregnated with a liquid. 3. The gas venting means for exhausting gas generated inside the probe main body to the outside of the furnace in the vicinity of the tail end of the probe main body, according to claim 1 or 2. Probe for temperature measurement in the lower part of the blast furnace in Japan. 4. A blast furnace according to claim 1, 2 or 3, wherein the protective cap has an outer peripheral portion formed with a bulky tip having an outer diameter larger than the outer diameter of the protective cap. Temperature probe in the lower part of the furnace.