阅读说明：本技术 一种高炉测温电偶的修复方法 (Repairing method of blast furnace temperature measuring couple ) 是由 赵德涛 杨超 王茂海 于 2021-06-18 设计创作，主要内容包括：本发明提供了一种高炉测温电偶的修复方法,利用银基钎料优异的流动性、填缝性及银钎焊熔剂优异的去膜、保护及活化性能,使用补偿导线对损坏的高炉测温电偶进行焊接修复,修复后的热电偶运行稳定,保证了仪表检测的可靠性和精度要求,对炉况监控和延长高炉使用寿命提供了有效保障。(The invention provides a method for repairing a blast furnace temperature thermocouple, which utilizes the excellent fluidity and gap filling property of silver-based brazing filler metal and the excellent film removing, protecting and activating properties of silver brazing flux, uses a compensating wire to weld and repair the damaged blast furnace temperature thermocouple, ensures the reliability and precision requirements of instrument detection, and provides effective guarantee for monitoring the furnace condition and prolonging the service life of a blast furnace.)

1. A blast furnace temperature measurement couple repairing method is characterized by comprising the following steps:

step S1: stripping the coupling core;

step S2: repairing the coupling core;

step S3: insulation treatment and peripheral protection;

the method is characterized in that in the step S2, the even core repairing comprises welding the end of the compensating lead and the end of the even core, and a silver-based brazing filler metal and a silver brazing flux are used in the welding process.

2. The repair method of claim 1, wherein the silver-based solder is a 45% silver-based solder and the silver brazing flux is a QJ102 silver brazing flux.

3. The repair method according to claim 1, wherein the compensating lead wires to be welded are sequentially sleeved with a heat shrinkable tube, a yellow wax tube and a metal hose before the couple core is repaired.

4. The repair method according to claim 1, wherein the welding process comprises heating the ends of the couple core and the compensating lead, melting the silver-based solder dipped with the silver brazing flux by a high temperature gun, contacting the ends of the couple core and the compensating lead, and overlapping the ends of the couple core and the compensating lead after plating a layer of solder thereon;

preferably, the high temperature gun is a welding flame spray gun.

5. The repairing method according to claim 1, wherein in step S1, the damaged galvanic couple is cut off at a suitable position, a steel saw is used to saw the metal protection tube along the axial direction of the metal protection tube at an angle of 45 ° at a position 1-2cm away from the fracture surface, a pipe cutter is used to cut along the radial direction of the metal protection tube after the tail portion is sawed, the metal protection tube is stopped when the metal protection tube is broken, then the section of the metal protection tube is stripped off after the insulating layer filler of the section is lightly knocked out, the couple core is left, and the exposed insulating layer filler is sealed by the insulating glue, so as to prevent the filler from leaking.

6. The repair method according to claim 1, wherein before repairing the couple core, the couple core end is cleaned of oxide skin.

7. The method of repairing a metal conduit of claim 1, wherein the steps of applying the insulation treatment and the outer periphery protection are applying a heat shrink tube to the weld, baking the heat shrink tube to shrink the heat shrink tube, applying a yellow wax tube to the heat shrink tube for insulation, and applying a metal conduit to the heat shrink tube and applying a protective joint.

8. The repair method according to claim 1, wherein after the couple core is peeled off, the couple core is tested by using a multimeter; measuring the resistance value between the two couple cores in a normal range by using an ohmic level of a multimeter, and measuring the millivolt value between the two couple cores in the normal range by using a millivolt level of the multimeter;

preferably, after the couple core is repaired, the compensation lead is tested by using a universal meter; and connecting the two compensating wires into a measuring instrument, wherein the instrument displays whether the data is consistent with the temperature value corresponding to the previous measured millivolt value, and if so, the repair couple temperature detection is normal.

9. The repair method according to claim 4, wherein the other end of the compensating wire is connected to a display instrument or a control instrument.

10. Use of the method according to any one of claims 1 to 9 in blast furnace hearth thermometric galvanic couple repair.

Technical Field

The application belongs to the field of instruments and meters in steel plants, and particularly relates to a repair method of a blast furnace temperature measurement couple.

Background

In the use process of the blast furnace, the temperature of the furnace body and the furnace hearth needs to be monitored in real time, and the armored thermocouple is a commonly used temperature measuring device. Because the environment around the blast furnace body is poor, cooling water pipe and temperature measuring point are more, in the middle and later period of the blast furnace age, along with the damage of cooling plate, the furnace shell cracks and other reasons, cause the furnace body thermocouple to damage seriously, wherein most of them all are that the couple core of galvanic couple breaks and cause.

For the case that the couple core of the armored thermocouple in the blast furnace wall is not broken and the couple core outside the furnace wall is broken, for the couple core extending out of the furnace wall and the length of the couple core reaches more than 5cm, the repairing operation difficulty is very large when a common operation method is adopted, for example, when a pipe cutter is used for cutting a metal protection pipe, the couple core is easy to damage, the operation time is long, the armored thermocouple core is stripped because the magnesium oxide packing has good air tightness, and the couple core is easy to break and damage when the magnesium oxide is removed. After the couple core is stripped, repair is typically done with a normal wire connection, i.e., the break is hinged or butted and then taped with insulating tape. But such a simple connection is prone to problems of poor contact and short service life. In addition, the material brittleness of the even core is different from that of the common lead, so that the hinged or butted part is easy to be broken again. By adopting the repairing method, the phenomenon of poor contact can occur after about ten days of use, the real-time performance of monitoring of the instrument is interfered, and the normal operation of production is influenced.

Therefore, an efficient and stable online repair method for blast furnace temperature measuring couples is urgently needed to repair damaged couples, provide guarantee for stable and real-time monitoring of furnace temperature, and further correctly guide the follow-up operation flow.

Disclosure of Invention

The embodiment of the application aims to provide a repair method and application of a blast furnace temperature thermocouple, which utilize the excellent flowability and gap filling property of silver-based brazing filler metal and the excellent film removing, protecting and activating properties of a silver brazing flux to weld and repair a damaged blast furnace temperature thermocouple by using a compensation lead, ensure the reliability and precision requirements of instrument detection and provide effective guarantee for monitoring furnace conditions and prolonging the service life of a blast furnace, and the repaired thermocouple runs stably.

In a first aspect, an embodiment of the present application provides a method for repairing a blast furnace temperature measurement couple, where the temperature measurement couple includes a metal protection tube, an insulation layer, and a couple core, and is characterized by including the following steps:

step S1: stripping the coupling core;

step S2: repairing the coupling core;

step S3: insulation treatment and peripheral protection;

the method is characterized in that in the step S2, the even core repairing comprises welding the end of the compensating lead and the end of the even core, and a silver-based brazing filler metal and a silver brazing flux are used in the welding process.

Further, the silver-based solder is 45% silver-based solder, and the silver brazing flux is QJ102 silver brazing flux.

Further, before repairing the couple core, the compensating lead to be welded is sleeved with a heat shrink tube, a yellow wax tube and a metal hose in sequence, and the end is exposed.

Further, the welding process comprises the steps of heating the end head of the couple core and the end head of the compensation lead, melting the silver-based brazing filler metal dipped with the silver brazing flux by using a high-temperature gun, contacting the silver-based brazing filler metal with the end head of the couple core and the end head of the compensation lead, and overlapping the silver-based brazing filler metal after plating a layer of brazing filler metal on the end head of the couple core and the end head of the compensation lead;

preferably, the high temperature gun is a welding flame spray gun.

Further, in the couple core stripping process of the step S1, the damaged couple is cut off at a proper position, the metal protection pipe is sawed through a steel saw along the axial direction of the metal protection pipe at an angle of 45 degrees at a position 1-2cm away from the section, then the metal protection pipe is cut along the radial direction of the metal protection pipe through a pipe cutter after the tail portion of the metal protection pipe is sawed through surrounding, the metal protection pipe is stopped when the metal protection pipe is rapidly broken, then the insulating layer filler of the section is slightly knocked out, the section of the metal protection pipe is stripped off, the couple core is left, and the exposed insulating layer filler is sealed through insulating glue, so that the filler is prevented from leaking.

In the implementation process, due to the air tightness of the insulating layer magnesium oxide filler, if the insulating layer magnesium oxide filler is directly sawed around the pipe wall, the section of the metal protection pipe is difficult to strip, and the couple core to be stripped is easily damaged in the stripping process. After the pipe wall is sawn along the axial direction of the pipe at an angle of 45 degrees, the tail part is sawn in a surrounding manner, the metal protection pipe section is cut by the pipe cutter to be quickly broken, the metal protection pipe section is stopped and is slowly knocked, the insulating layer magnesium oxide filler can be knocked out, and therefore the couple core cannot be damaged by cutting the pipe violently.

Furthermore, before the couple core is repaired, the oxide skin at the end of the couple core needs to be cleaned, so that the subsequent plating of the brazing filler metal is facilitated.

Further, after the couple core is repaired, the step of insulation treatment and peripheral protection is to sleeve the welding position with heat-shrinkable tube, bake the heat-shrinkable tube to shrink, sleeve the heat-shrinkable tube with yellow wax tube for insulation, and finally sleeve the metal conduit and sleeve the protective joint.

In the implementation process, the welding point of the compensation lead and the couple core needs to be subjected to insulation treatment and peripheral protection. Because the compensation lead is sleeved with the heat-shrinkable tube, the yellow wax tube and the metal hose in sequence in advance, at the moment, after welding is finished, the heat-shrinkable tube can be moved axially, the heat-shrinkable tube is sleeved at the welding position, the heat-shrinkable tube is baked by fire to be shrunk, then the yellow wax tube is sleeved for insulation, and finally the metal hose is sleeved and sleeved with the protective joint.

Further, after the couple core is peeled off, the couple core is tested by using a multimeter. The resistance value between two couple cores is measured in normal range by using the ohm shift of a universal meter (the temperature value is high, the resistance value is large, the temperature value is low, the resistance value is small, generally within 200 omega), and the millivolt shift of the universal meter is used for measuring the millivolt value between two couple cores in normal range.

Preferably, after the couple core is repaired, the compensation lead is tested by using a universal meter. And (4) connecting the two compensating wires into a measuring instrument, displaying whether the data is consistent with the temperature value corresponding to the previous millivolt value by a computer, and if so, normally detecting the temperature of the repair couple.

Further, the other end of the compensation wire is connected with a display instrument or a control instrument.

In a second aspect, the embodiment of the present application provides an application of the above method in a blast furnace hearth temperature measuring couple.

Has the advantages that:

in the implementation process, the invention provides a repair method of a blast furnace temperature thermocouple, which utilizes the excellent fluidity and gap filling property of silver-based brazing filler metal and the excellent film removing, protecting and activating properties of silver brazing flux, uses a compensation lead to weld and repair the damaged blast furnace temperature thermocouple, ensures the reliability and precision requirements of instrument detection, and provides effective guarantee for monitoring the furnace condition and prolonging the service life of the blast furnace.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a temperature measuring couple according to an embodiment of the present invention.

Wherein, each reference numeral is, 1-a metal protection tube; 2-an insulating layer; 3-couple core; 4-compensation wire.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Examples

Referring to fig. 1, the present application provides a method for repairing a blast furnace thermocouple, which is generally an armored thermocouple and structurally includes a metal protection tube 1, an insulation layer 2 and a thermocouple core 3. The metal protection tube is usually made of stainless steel, the insulating layer is made of magnesium oxide, and the couple core is made of nickel-chromium-nickel-silicon material. In the case that the couple core of the armored thermocouple in the blast furnace wall is not broken and the couple core outside the furnace wall is broken, and the length of the couple core extending out of the furnace wall is more than 5cm, the method provides a stable and efficient online repairing method, which comprises the following steps:

step S1: stripping the coupling core;

step S2: repairing the coupling core;

step S3: insulation treatment and peripheral protection;

in step S2, the pair core repairing includes welding the end of the compensation lead wire to the end of the pair core, and the welding process uses a silver-based solder and a silver brazing flux. The silver-based solder is 45% of silver-based solder, and the silver brazing flux is QJ102 silver brazing flux.

The 45% silver-based brazing filler metal has the silver content of 45%, the melting point of 660-725 ℃, good fluidity and gap filling property, smooth brazing seam surface, high joint strength and impact resistance, and is commonly used for brazing copper, copper alloy, steel, stainless steel and the like.

The QJ102 silver brazing flux is a powdered silver brazing flux, has a melting point of about 450 ℃, and can effectively remove oxides on stainless steel and promote the overflow of brazing filler metal. It is usually used in 600-. The QJ102 silver brazing flux may function as follows: (1) removing the film, removing the oxides on the surfaces of the base metal and the brazing filler metal, and creating necessary conditions for spreading and filling the joints on the base metal by the liquid brazing filler metal; (2) the protection function is that the surface of the base metal and the brazing filler metal is covered by a liquid thin layer, and the oxidation is prevented by isolating air; (3) the activation promotes the interface activation and improves the wetting capacity of the liquid solder to the surface of the base metal.

The phosphorus copper welding rod commonly used in the market has high welding temperature, high difficulty, poor conductivity and corrosion resistance and easy breakage. The 45% silver-based solder has excellent processing performance, proper melting point, good wettability and capability of filling gaps, and is high in strength, good in plasticity, and excellent in conductivity and corrosion resistance.

It has been surprisingly found that the strength of the soldered joint between the compensating lead and the couple core is quite high when a silver-based solder is used as the solder in combination with a silver soldering flux. The operation is normal after the welding rod is used for three months, compared with the service life of overlapping or welding by a phosphor copper welding rod in the conventional process, the service life is only less than ten days, and the work period is improved by nearly ten times!

Before repairing the couple core, namely before welding, the surface grease, oxide skin and the like at the end of the couple core need to be cleaned, so that the subsequent plating of the brazing filler metal is facilitated.

Before repairing the couple core, the compensating lead to be welded is sleeved with a heat shrink tube, a yellow wax tube and a metal hose in sequence, and the end is exposed.

The welding process comprises the steps of heating the ends of the couple core and the compensating lead, melting the silver-based brazing filler metal dipped with the silver brazing flux by using a high-temperature gun, contacting the ends of the couple core and the compensating lead, and overlapping the ends of the couple core and the compensating lead after plating a layer of brazing filler metal on the ends of the couple core and the compensating lead; wherein, the high temperature gun is a welding flame spray gun.

Further, in the couple core stripping process of the step S1, the damaged couple is cut off at a proper position, the metal protection pipe is sawed through a steel saw along the axial direction of the metal protection pipe at an angle of 45 degrees at a position 1-2cm away from the section, then the metal protection pipe is cut along the radial direction of the metal protection pipe through a pipe cutter after the tail part of the metal protection pipe is sawed through surrounding, the metal protection pipe is stopped when the metal protection pipe is rapidly broken, then the insulating layer magnesium oxide filler of the section is slightly knocked out, the section of the metal protection pipe is stripped off, the couple core is left, and the exposed insulating layer magnesium oxide filler is sealed through insulating glue, so that the filler is prevented from leaking.

In the implementation process, due to the air tightness of the insulating layer magnesium oxide filler, if the insulating layer magnesium oxide filler is directly sawed around the pipe wall, the section of the metal protection pipe is difficult to strip, and the couple core to be stripped is easily damaged in the stripping process. After the pipe wall is sawn along the axial direction of the pipe at an angle of 45 degrees, the tail part is sawn in a surrounding manner, the metal protection pipe section is cut by the pipe cutter to be quickly broken, the metal protection pipe section is stopped and is slowly knocked, the insulating layer magnesium oxide filler can be knocked out, and therefore the couple core cannot be damaged by cutting the pipe violently. After the pipe wall is sawn by 45 degrees along the axial direction of the pipe, the magnesium oxide filler in the metal protective pipe can be loosened, and the couple core is not easy to damage.

Further, after the couple core is repaired, the step of insulation treatment and peripheral protection is to sleeve the welding position with heat-shrinkable tube, bake the heat-shrinkable tube to shrink, sleeve the heat-shrinkable tube with yellow wax tube for insulation, and finally sleeve the metal conduit and sleeve the protective joint.

In the implementation process, the welding point of the compensation lead and the couple core needs to be subjected to insulation treatment and peripheral protection. Because the compensation lead is sleeved with the heat-shrinkable tube, the yellow wax tube and the metal hose in sequence in advance, at the moment, after welding is finished, the heat-shrinkable tube can be moved axially, the heat-shrinkable tube is sleeved at the welding position, the heat-shrinkable tube is baked by fire to be shrunk, then the yellow wax tube is sleeved for insulation, and finally the metal hose is sleeved and sleeved with the protective joint.

Further, after the couple core is peeled off, the couple core is tested by using a multimeter. The resistance value between two couple cores is measured in normal range by using the ohm shift of a universal meter (the temperature value is high, the resistance value is large, the temperature value is low, the resistance value is small, generally within 200 omega), and the millivolt shift of the universal meter is used for measuring the millivolt value between two couple cores in normal range.

Preferably, after the couple core is repaired, the compensation lead is tested by using a universal meter. And connecting the compensating lead into a measuring instrument, displaying whether the data is consistent with the temperature value corresponding to the previous measured millivolt value by a computer, and if so, normally detecting the temperature of the repair couple.

Further, the other end of the compensation wire is connected with a display instrument or a control instrument.

In a second aspect, the method for repairing a blast furnace temperature couple in the embodiment of the application can be applied to the repairing effect of a blast furnace hearth temperature couple.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.