CN210603632U

CN210603632U - Improved generation noble metal temperature measuring device

Info

Publication number: CN210603632U
Application number: CN201921275233.7U
Authority: CN
Inventors: 孙光模; 姚清海
Original assignee: Jinan Junyang Automation Science & Technology Co ltd
Current assignee: Jinan Junyang Automation Science & Technology Co ltd
Priority date: 2019-08-03
Filing date: 2019-08-03
Publication date: 2020-05-22
Anticipated expiration: 2029-08-03

Abstract

The utility model relates to a special temperature measuring device of improved generation noble metal belongs to the temperature measurement field. The technical scheme provided by the utility model is an improved noble metal temperature measuring device, which comprises an integral instrument source-taking brick, a specially-made thermocouple and a sealing flange connecting pipe; the method is characterized in that a sealing flange connecting pipe is welded on a furnace shell, an integral instrument source taking brick is built in a process brick, a hole is arranged in the center when viewed from the cross section, a special thermocouple is inserted into the hole of the integral instrument source taking brick, the special thermocouple is positioned in a space enclosed by the sealing flange connecting pipe, the furnace shell and the integral instrument source taking brick, a signal is connected to a wiring device on the sealing flange connecting pipe through a flexible wire, and the special thermocouple is in a free state in the space. The utility model provides a defect and hidden danger that exist among the background art. The temperature measuring instrument has the advantages of reasonable structure, safety, reliability, relatively accurate measurement, convenience in maintenance and replacement, prolonged service life, and the like, and is an improvement and innovation for temperature detection of high-temperature and high-pressure facilities.

Description

Improved generation noble metal temperature measuring device

Technical Field

The utility model relates to an improved generation noble metal temperature measuring device belongs to the temperature measurement field.

Background

The sealing facilities such as a hot blast stove and a hot blast pipeline which are matched with a blast furnace for iron making are commonly characterized in that the high temperature and the high pressure in the facilities are used for preventing heat loss, and a plurality of layers of bricks made of different materials are built in the facilities, so that the internal high temperature environment is insulated and isolated from the outside through the bricks. The hot blast stove works in three states of combustion (the state is 1000-1500 ℃, the pressure is negative pressure), braising (the state is about 1300-1400 ℃, the pressure is 0) and air supply (the state is 1250-1400 ℃, the pressure is 0.35-0.55 MPa), the three states are mutually converted, and the temperature detection is difficult especially in the arch crown (position), the arch crown and the heat accumulator conversion area because the work is intermittent, the working condition changes greatly and is a high-temperature and high-pressure environment; the hot air pipeline is a channel for continuously providing reasonable hot air (0.35-0.55 MPa, 1200 ℃) for the blast furnace by the hot air furnace, the work is continuous, high temperature and high pressure, and the temperature detection is difficult. The following detection methods currently exist: firstly, adopt pre-buried stainless steel protection tube and thermo detector (like thermocouple, infrared pyrometer etc.) to combine, in the technology brick of protection tube insertion furnace wall or pipeline, because the inside and outside difference in temperature of facility is too big, the expend with heat and contract with cold degree difference of inside and outside layer brick, after working a period, the stainless steel protection tube is distorted by the technology brick, the protection tube is crooked to reach 5-6cm, leads to the thermocouple fracture, infrared pyrometer only to detect the temperature of technology brick. Secondly, adopting a form (such as ZL201120349918.9 and ZL201220681029.7) of an instrument brick (with a reserved hole) heating thermocouple, wherein the instrument brick is arranged in a furnace wall or a pipeline, the thermocouple is inserted into a hole formed by combining two instrument bricks, and the thermocouple and the instrument brick are tightly plugged by a plug to exert force; because the furnace wall has different degrees of expansion with heat and contraction with cold inside and outside, the above situation also occurs after working for a period of time. Thirdly, in the method of (2000) YK01-57 of metallurgical installation atlas, the steel plate, the extension pipe and the flange fixing pipe on the outer sleeve brick are all damaged in less than one year, and the thermocouple is unprotected; then the outer sleeve brick is forged and unfired, so that the thermocouple is deformed and broken after working for about one year (even shorter time); the wiring device is small in size, not easy to operate and easy to hurt people. Fourthly, the mode of ZL201320451522.4, the whole instrument brick is fired after being pressed by a press machine, is good in practical application, has no deformation and is broken, but the whole instrument brick is provided with a flange, and a thermocouple is fixedly connected by adopting a flange and fixed by bolts, so that the thermocouple and the whole instrument brick are in an integrated structure, the heat of the thermocouple cannot be dissipated and a thermocouple head is exploded, and the thermocouple is damaged and is not easy to replace; the whole instrument brick is provided with a flange (metal), the brick is made of non-metal materials, the expansion coefficients of the flange and the brick are different, and the thermocouple is easy to break; the wiring device has certain defects, such as easy looseness after a long time, potential safety hazards of fire and the like.

Disclosure of Invention

In order to solve above-mentioned hidden danger and defect, guarantee safety, the economic operation of hot-blast furnace, hot-blast main, the utility model discloses a purpose is: the temperature measuring device has the advantages of reasonable structure, safety, reliability, relatively accurate measurement, long service life and convenient replacement.

In order to overcome the defect that exists among the background art, the utility model provides a technical scheme is: an improved noble metal temperature measuring device comprises an integral instrument source taking brick, a special thermocouple and a sealing flange connecting pipe; the method is characterized in that:

the sealing flange connecting pipe is welded on the furnace shell, the integral instrument source taking brick is built in the process brick, a hole is arranged in the center when viewed from the cross section, the special thermocouple is inserted into the hole of the integral instrument source taking brick, the special thermocouple is positioned in a space surrounded by the sealing flange connecting pipe, the furnace shell and the integral instrument source taking brick, a signal is connected to a wiring device on the sealing flange connecting pipe through a flexible wire, and the special thermocouple is in a free state and is flexible in wiring in the space; the special thermocouple consists of a double-layer protective corundum tube (or recrystallized silicon carbide), a double-core corundum tube, a noble metal thermocouple wire and a steel cap.

The whole instrument source-taking brick is built in the process brick, and the material quality of the whole instrument source-taking brick is matched with the expansion amount of the high-temperature brick at the innermost layer of the process wall or the pipeline. The brick is a cuboid, a straight preformed hole is arranged in the center when viewed from the cross section, and the area of the cross section is twice of the sectional area of the process brick; the length is equal to or similar to the sum of the sizes of the process bricks when viewed from the cross section of the casting furnace. Molding under 17MPa, air drying, and firing at 1720 deg.C.

The special thermocouple consists of a double-layer protective corundum tube (or recrystallized silicon carbide), a double-core corundum tube, a noble metal thermocouple wire and a steel cap. The steel cap is a "concave" groove with a hole in the center. High-temperature-resistant insulating materials (such as magnesium oxide) are coated between the outer double-layer protective corundum tubes, not integrally coated, but coated at intervals, resonance between the two is prevented, and heat can be guaranteed to be emitted without exploding the coupling heads of the outer corundum tubes (10). High-temperature-resistant insulating materials (such as magnesium oxide) are also coated between the inner-layer protective corundum tube (11) and the double-core corundum tube (12), and are coated at intervals instead of being coated integrally, so that resonance between the inner-layer protective corundum tube and the double-core corundum tube is prevented, heat can be distributed, and a coupling head of the inner-layer corundum tube (11) is not exploded. The double-core corundum tube (12) is used for penetrating thermocouple wires. The steel cap presses the tail parts of the internal and external layers to protect the corundum tube, so that the corundum tube and the corundum tube are prevented from being dislocated under the action of external force (such as the pressure of hot air) to damage thermocouple wires, and meanwhile, a certain gap is formed to ensure that energy can be emitted; the double-core corundum tube extends out of the central hole of the steel cap to lead out the thermocouple wire.

The sealing flange connecting pipe is a device which can ensure that a measured medium is not leaked and can lead out a measuring signal. The cable hanging ring is composed of a flange connecting pipe, a binding post, a cable hanging ring and a blind flange; the binding post consists of a base with an external screw thread at one end, a fastener with an internal screw thread at one end, an insulating rod with a central hole, a copper rod with screw threads at two ends, a gasket and a nut; the copper rod is inserted into the insulating rod with the central hole, part of the copper rod in the insulating rod is not provided with screw threads, and only part of the copper rod exposed outside the insulating rod is provided with screw threads; one end of the binding post is connected with the thermocouple wire in the flange connecting pipe to form flexible connection, and the other end of the binding post is connected with an external cable; the cable hanging ring is used for fixing the cable by preventing the cable from pulling out the wiring terminal.

The utility model provides a defect and hidden danger that exist among the background art. The temperature measuring instrument has the advantages of reasonable structure, safety, reliability, relatively accurate measurement, convenience in maintenance and replacement, prolonged service life and the like, and is an improvement and innovation for temperature detection of high-temperature and high-pressure facilities (such as a vault, a dome and a hot air pipeline of a hot air furnace).

Drawings

FIG. 1 is a schematic structural diagram of an improved precious metal temperature measuring device;

FIG. 2 is a schematic view of a special thermocouple structure of an improved precious metal temperature measuring device;

FIG. 3 is a detail view of the terminal post on the sealing flange joint of the improved noble metal temperature measuring device.

Wherein in the figure: 1. taking a source brick of the whole instrument; 2. specially-made thermocouples; 3. sealing the flange adapter; 4. a craft brick; 5. a heat insulation felt; 6. spraying a layer; 7. a furnace shell; 8. a binding post; 9. a cable suspension ring; 10. an outer corundum tube; 11. an inner layer corundum tube; 12. a double-core corundum tube; 13. an insulating material (magnesium oxide) between the inner corundum tube and the double-core corundum tube; 14. insulating material (magnesium oxide) between the outer corundum tube and the inner corundum tube; 15. a thermocouple wire; 16. a steel cap; 17. exposing the thermocouple wire; 18. a base with one end provided with an external screw thread; 19. a fastener with internal threads at one end; 20. an insulating rod with a central hole; 21. the two ends of the copper bar are provided with screw threads; 22. a gasket; 23. and a nut.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. In the present embodiment, the temperature measurement of the arch position of the hot blast stove is taken as an example for explanation.

As shown in figure 1, firstly, the size of an integral instrument source-taking brick (1) is made according to the size of each layer of process bricks (4) of an arch position of a hot blast stove, and in order to reduce unnecessary trouble in the process of casting the stove, the cross section area of the integral instrument source-taking brick (1) is 2 times of that of the process bricks (4), namely the integral instrument source-taking brick (1) occupies the positions of the two process bricks in the process wall from the cross section view; and then manufacturing a model and batching, performing pressure processing, airing, roasting in a kiln, roasting according to the temperature rise curve requirement, re-cooling, and detecting the size of the roasted product, particularly the size of a reserved hole, and whether the roasted product is straight (the error is not more than 3 mm).

With continued reference to fig. 1, a sealed flanged joint (3) is made. Firstly, the drift diameter (such as DN200), the length (such as 150mm) and the flange standard (such as GB/T9119-2010) of the flanged joint pipe are positioned, and then the binding post is manufactured.

Referring to fig. 3, the parts for making the terminal are machined. Firstly, a stainless steel base (such as DN15 and 60mm in length) is manufactured, an external screw thread is processed at one end, and then a fastening piece (19) with an internal screw thread at one end, an insulating rod (20) with a central hole, a copper rod (21) with screw threads at two ends, a gasket (22) and a nut (23) are manufactured according to the base (18) with the external screw thread at one end.

Continuing to refer to the figures 1 and 3, welding a flange at one end of a flange connecting pipe, opening the flange connecting pipe, welding a base (18) with an external screw thread at one end on the flange connecting pipe, wherein one end with the screw thread is positioned at the outer side of the flange connecting pipe, inserting a small end of an insulating rod (20) with a central hole into the base (18) with the external screw thread at one end, inserting copper rods (21) with screw threads at two ends into the insulating rod (20) with the central hole, enabling the screw threads not to enter the insulating rod, respectively exposing about 2cm on the inner side and the outer side of the flange connecting pipe, and fixing the insulating rod (20) with the central hole on the base (18) with the external screw thread at one end by using a fastener (19) with the internal screw thread at one end; gaskets (22) are respectively additionally arranged at two ends of a copper bar (21) with screw threads at two ends and are fixed by nuts (23) to complete the manufacture of a binding post (8), and meanwhile, the binding post (8) is made to complete the wiring of the positive electrode and the negative electrode of a signal; and cable rings (9) are welded at the outer sides of the flange connecting pipes and near the two binding posts (8). And finishing the manufacture of the sealing flange connecting pipe (3).

As shown in fig. 2, a special thermocouple (2) was fabricated. Firstly, selecting thermocouple specification (for example, B couple is selected at 1400 ℃), and then selecting the sizes of an outer-layer corundum tube (10), an inner-layer corundum tube (11), a double-core corundum tube (12) and a thermocouple wire (15) according to the size of a whole instrument source-taking brick (1), the size of a process brick (4) and the size of a sealing flange connecting tube (3). Firstly, adding an insulating material (magnesium oxide) (14) at the bottom of an outer corundum tube (10), then adding glue to dilute the insulating material (magnesium oxide) (14), irregularly coating the insulating material (magnesium oxide) (14) on the outer side of an inner corundum tube (11), wherein the coating part does not form a circumference, inserting the inner corundum tube (11) into the outer corundum tube (10), and shaking for several times, wherein a certain gap is left between the inner corundum tube and the outer corundum tube without actual contact; the outer side of the double-core corundum tube (12) is irregularly coated with an insulation material (magnesium oxide) (13) diluted by glue, the periphery is not formed at the coating position, a thermocouple wire (15) is inserted into the double-core corundum tube (12), the double-core corundum tube (12) at the moment is inserted into the inner-layer corundum tube (11), the inner wall of a steel cap (16) is coated with glue, the tail parts of the inner-layer corundum tube and the outer-layer corundum tube are pressed, the thermocouple wire (15) is led out from the inner hole of the steel cap (16), and the inner hole of the steel cap (16) and the double-core corundum tube (12) are filled with the insulation material. And finishing the manufacture of the special thermocouple (2).

The installation process is as follows:

the method is characterized in that a hole (phi 200) is formed in a furnace shell (7) to be detected on the spot, a sealing flange connecting pipe (3) is welded on the outer side of the furnace shell (7), when the process casting furnace reaches the height of a measuring point, an integral instrument source taking brick (1) is coaxially installed with the sealing flange connecting pipe (3), one end face of the integral instrument source taking brick (1) is flush with the end face of the innermost process brick (4), and other process bricks (4) are built around the integral instrument source taking brick (1). When the production is finished in a casting furnace, a special thermocouple (2) is inserted into a reserved hole of an integral instrument source taking brick (1) and is reserved with a certain length in the furnace, a heat insulation felt (5) is stuffed between the outer side of the special thermocouple (2) and the reserved hole of the integral instrument source taking brick (1), the special thermocouple (2) cannot touch a spraying layer (6) and a furnace shell (7), an exposed thermocouple wire (17) is respectively connected to a binding post (8) of a positive pole and a negative pole-the inner side of a flange connection pipe, an external cable is connected to the binding post (8) of the positive pole and the negative pole-the outer side of the flange connection pipe, and the cable is fixed on a cable hanging ring (9), so that the binding post (8) is prevented from being damaged due to weight of the cable, and a signal channel. And then a blind flange (not shown in the figure) is used for sealing the sealing flange connecting pipe (3) on the furnace shell.

When the thermocouple is damaged in work, the blind flange is detached, the thermocouple wire is detached from the binding post, the thermocouple is pulled out, a new thermocouple is replaced, the blind flange is used for sealing after the thermocouple is inserted slowly, the thermocouple is prevented from bursting, and the thermocouple is connected with the wire again. Is simple and practical.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and decorations can be made, such as the material of each component, the wiring sealing method, the geometric shape of the source brick, etc., which should also be regarded as the protection scope of the present invention.

Claims

1. An improved noble metal temperature measuring device comprises an integral instrument source taking brick, a special thermocouple and a sealing flange connecting pipe; the method is characterized in that:

the sealing flange connecting pipe is welded on the furnace shell, the integral instrument source taking brick is built in the process brick, a hole is arranged in the center when viewed from the cross section, the special thermocouple is inserted into the hole of the integral instrument source taking brick, the special thermocouple is positioned in a space surrounded by the sealing flange connecting pipe, the furnace shell and the integral instrument source taking brick, a signal is connected to a wiring device on the sealing flange connecting pipe through a flexible wire, and the special thermocouple is in a free state and is flexible in wiring in the space; the special thermocouple consists of a double-layer protective corundum tube, a double-core corundum tube, a noble metal thermocouple wire and a steel cap.

2. The improved precious metal thermometric device of claim 1, wherein the integral instrumentation source brick is a cuboid; the center of the brick is provided with a straight preformed hole when viewed from the cross section, and the area of the cross section of the brick is twice of the sectional area of the technical brick; the length is equal to or similar to the sum of the sizes of the process bricks when viewed from the cross section of the casting furnace.

3. An improved precious metal thermometry apparatus according to claim 1 wherein the steel cap is a "concave" trough with a hole in the center.

4. An improved precious metal temperature measuring device as claimed in claim 1, wherein the outer layer of double-layer protective corundum tube is coated with high temperature insulation material, and the inner layer of protective corundum tube (11) and the double-core corundum tube (12) are also coated with high temperature insulation material.

5. An improved noble metal thermometer, as recited in claim 1, wherein the steel cap presses against the inner and outer layers to protect the end of the corundum tube, and the twin-core corundum tube extends out of the central hole of the steel cap to lead out the thermocouple wire.

6. An improved noble metal thermometer according to claim 1, wherein said sealed flanged connection comprises flanged connection, binding post, cable hanging ring, and blind flange.

7. The improved noble metal temperature measuring device as claimed in claim 6, wherein the binding post is composed of a base with an external screw thread at one end, a fastener with an internal screw thread at one end, an insulating rod with a central hole, a copper rod with screw threads at two ends, a gasket and a nut; the copper rod is inserted into the insulating rod with the central hole, part of the copper rod in the insulating rod is not provided with screw threads, and only part of the copper rod exposed outside the insulating rod is provided with screw threads; one end of the binding post is connected with the thermocouple wire in the flange connecting pipe to form flexible connection, and the other end of the binding post is connected with an external cable; the cable hanging ring is used for fixing the cable by preventing the cable from pulling out the wiring terminal.