CN218524256U

CN218524256U - Device for measuring kiln temperature by optical fiber sensing

Info

Publication number: CN218524256U
Application number: CN202222557550.6U
Authority: CN
Inventors: 王亚奇; 杨冲
Original assignee: Hubei Ronbay Lithium Battery Materials Co Ltd
Current assignee: Hubei Ronbay Lithium Battery Materials Co Ltd
Priority date: 2022-09-27
Filing date: 2022-09-27
Publication date: 2023-02-24
Anticipated expiration: 2032-09-27

Abstract

The application relates to a device for measuring kiln temperature by optical fiber sensing, which comprises a shell, a connecting pipe and a plurality of optical fiber sensing components, wherein the connecting pipe is arranged on the shell, each optical fiber sensing component comprises a U-shaped pipe, a displacement component and a plurality of optical fiber grating components, one end of each U-shaped pipe is communicated with the connecting pipe, each displacement component is provided with a first part and a second part, the first part extends into the U-shaped pipe, the second part is connected with the optical fiber grating components, and the other ends of the optical fiber grating components are used for being connected with demodulation equipment provided with a computer; all pack in U type pipe, connecting pipe and the casing has the inflation liquid of being heated, and this application can carry out accurate the surveying to the temperature of kiln according to the periodic variation of fiber grating subassembly and this height sensitivity of fiber grating, response fast, the strong characteristic of interference killing feature to realize accurate, the real time monitoring to the inside temperature field of kiln, ensure the stability of sintering reaction.

Description

Device for measuring kiln temperature by optical fiber sensing

Technical Field

The application relates to the technical field of fiber grating sensing, in particular to a device for measuring the temperature of a kiln by using optical fiber sensing.

Background

In the lithium battery industry at present, ternary and lithium iron phosphate and other cathode materials need high temperature to carry out sintering reaction, sintering is used as a vital process in the cathode material manufacturing process, and the accuracy and stability of the temperature field of the ternary and lithium iron phosphate cathode materials play a decisive role in the performance of the ternary and lithium iron phosphate cathode materials.

The thermocouple is generally adopted in the existing kiln for temperature detection, and the thermocouple sensor is the most commonly used contact type temperature measuring device in the industry because the thermocouple has the characteristics of stable performance, large temperature measuring range, remote signal transmission and the like.

However, the sensitivity of the thermocouple sensor is very low, and signals of the external environment easily interfere with the thermocouple sensor, and in addition, the thermocouple sensor is also easily affected by the temperature drift of the preamplifier, so that the thermocouple sensor is not convenient to measure very small temperature changes, and thus the thermocouple sensor cannot accurately detect the temperature field inside the kiln, which may affect the temperature control of the sintering reaction, and even may directly cause the reaction failure of the material, resulting in the waste of the raw material.

Aiming at the problems, the device for measuring the temperature of the kiln by using optical fiber sensing is designed.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a device for measuring kiln temperature by optical fiber sensing to solve the problem that the temperature control of sintering reaction can be influenced by the temperature field in the detection kiln which can not be accurately detected by the existing temperature sensor in the kiln in the prior art, and even the reaction failure of materials can be directly caused, so that raw materials are wasted.

In a first aspect, there is provided an apparatus for measuring kiln temperature by optical fiber sensing, comprising:

the furnace comprises a shell, a furnace body and a furnace cover, wherein the shell is used for being installed in the furnace body, and an accommodating cavity is enclosed by the shell;

the connecting pipe is arranged on the shell and communicated with the accommodating cavity in the shell;

the optical fiber sensing assemblies are provided with a plurality of groups, and the optical fiber sensing assemblies are uniformly distributed in an annular shape along the axis of the connecting pipe;

the optical fiber sensing assembly comprises a U-shaped pipe, a displacement assembly and a plurality of optical fiber grating assemblies, wherein one end of the U-shaped pipe is communicated with a connecting pipe, the displacement assembly is provided with a first part and a second part, the first part extends into the U-shaped pipe, the second part is connected with the optical fiber grating assemblies, and the other ends of the optical fiber grating assemblies are used for being connected with demodulation equipment provided with a computer;

and heated expansion liquid is filled in the accommodating cavities of the U-shaped pipe, the connecting pipe and the shell, and when the heated expansion liquid is heated, the heated expansion liquid pushes the first part to move towards the direction away from the U-shaped pipe.

In some embodiments, the fiber grating assembly includes a fiber grating body, a ceramic sleeve and a metal sleeve, two ends of the fiber grating body are respectively connected with the displacement assembly and the demodulation device, the ceramic sleeve is sleeved on the fiber grating body, the metal sleeve is sleeved on the ceramic sleeve, the metal sleeve is connected with the U-shaped tube through a plurality of fixed blocks, and the fiber grating body, the ceramic sleeve and the metal sleeve are coaxially arranged;

and the fiber bragg grating bodies in the fiber bragg grating assemblies are uniformly distributed in an annular shape along the axis of one end, far away from the connecting pipe, of the U-shaped pipe.

In some embodiments, the displacement assembly includes a sliding block, a connecting shaft, and a fixing plate, the sliding block is slidably disposed in the U-shaped tube to form a first portion, the fixing plate is disposed on a side of the U-shaped tube away from the connecting tube to form a second portion, two ends of the connecting shaft are respectively connected to the sliding block and the fixing plate, and the fixing plate is connected to the fiber bragg grating bodies.

In some embodiments, the slider is made of a low coefficient of expansion material.

In some embodiments, the U-shaped tube is provided with an air pressure balancing port located between the slider and the fixing plate.

In some embodiments, the U-tube is a double layer vacuum structure.

In some embodiments, the shell is spherical.

The embodiment of the application provides a device for measuring kiln temperature by optical fiber sensing, because this application accessible demodulation equipment launches the broadband light source to the fiber grating subassembly, then the inflation liquid that is heated will expand and promote a plurality of displacement subassemblies to remove after being heated, make the displacement subassembly of annular distribution even pull the fiber grating subassembly, make the fiber grating subassembly extend along its axial, the cycle of fiber grating subassembly will change like this, the central wavelength of fiber grating subassembly will change along with the cycle of fiber grating subassembly, then wavelength drift signal passback gives demodulation equipment, and detect out the drift volume size of spectrum through demodulation equipment, thereby analyze the change of stress through the computer, and then obtain the size change of temperature, therefore, this application can be according to the cycle change of fiber grating subassembly and this height sensitivity of fiber grating, the response is fast, the characteristics that interference killing feature is strong and the durability is strong, carry out accurate detection to the temperature of kiln, thereby realize the accurate to the inside temperature field of kiln, real time monitoring, ensure the stability of sintering reaction, therefore, the clothes are strong in practicability.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic structural diagram provided in an embodiment of the present application;

fig. 2 is a detection flowchart provided in an embodiment of the present application.

In the figure: 1. a housing; 2. a connecting pipe; 3. an optical fiber sensing assembly; 31. a U-shaped pipe; 32. a displacement assembly; 321. a slider; 322. a connecting shaft; 323. a fixing plate; 33. a fiber grating assembly; 331. a fiber grating body; 332. a ceramic bushing; 333. a metal sleeve; 334. a fixed block; 34. an air pressure balancing port; 4. a liquid that expands upon heating.

Detailed Description

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. 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.

The embodiment of the application provides a device for measuring kiln temperature by optical fiber sensing, which can solve the problem that the temperature control of sintering reaction can be influenced by the temperature field in the kiln which can not accurately detect the temperature in the kiln and can directly cause the reaction failure of materials and the waste of raw materials in the prior art.

Referring to fig. 1-2, an apparatus for measuring kiln temperature by optical fiber sensing includes a housing 1, a connecting pipe 2 and a plurality of sets of optical fiber sensing assemblies 3, wherein the number of the optical fiber sensing assemblies 3 in the present application is preferably three, which are respectively divided into primary, standby and secondary standby, so that when one of the optical fiber sensing assemblies 3 is damaged, the apparatus can still be used;

the shell 1 is used for being installed in a kiln, the shell 1 is made of a titanium alloy material, so that the shell 1 is more resistant to high temperature, is not easily oxidized and is not easily reacted, and the service life of the shell 1 is prolonged, the shell 1 encloses a containing cavity, the connecting pipes 2 are arranged on the shell 1 and are communicated with the containing cavity in the shell 1, three groups of optical fiber sensing assemblies 3 are uniformly distributed in an annular shape along the axis of the connecting pipes 2, the optical fiber sensing assemblies 3 comprise U-shaped pipes 31, displacement assemblies 32 and a plurality of optical fiber grating assemblies 33, in the embodiment, the optical fiber grating assemblies 33 are two groups, one ends of the U-shaped pipes 31 are communicated with the connecting pipes 2, each displacement assembly 32 is provided with a first part and a second part, the first part extends into the U-shaped pipes 31, the second part is connected with the optical fiber grating assemblies 33, and the other ends of the optical fiber grating assemblies 33 are used for being connected with demodulation equipment provided with a computer;

in this embodiment, the demodulation device may be an ASE broadband light source module commercially available on the market, and the computer may be a device capable of independently processing information, such as a computer, so that after the ASE broadband light source module emits a broadband light source to the fiber grating assembly 33, some broadband light sources will form reflected light after being reflected by the fiber grating assembly 33 and return the reflected light to the ASE broadband light source module, and a large amount of reflected light is superimposed to form light with a specific wavelength;

the U-shaped tube 31, the connecting tube 2 and the accommodating cavity in the shell 1 are filled with heated expansion liquid 4, when the heated expansion liquid 4 is heated, the heated expansion liquid 4 pushes the first part to move away from the U-shaped tube 31, in this embodiment, mercury is used as the heated expansion liquid 4, so that in the implementation process, the shell 1 can be inserted into the kiln, the ASE broadband light source module transmits a broadband light source to the fiber grating assembly 33, then the mercury in the shell 1, the connecting tube 2 and the U-shaped tube 31 can be heated and expanded under the influence of the kiln temperature, so that the mercury expansion can push the plurality of displacement assemblies 32 to move, so that the plurality of fiber grating assemblies 33 can be pulled through the plurality of displacement assemblies 32, and meanwhile, the fiber sensing assemblies 3 which are distributed annularly can make the pulling force on the fiber grating assemblies 33 more uniform, the influence of the inclined pulling force generated by uneven stress on the fiber bragg grating component 33 on the temperature measurement accuracy is avoided, so that the fiber bragg grating component 33 can only extend along the axial direction of the fiber bragg grating component 33, the period of the fiber bragg grating component 33 changes, the spectrum drift amount can be detected through the ASE broadband light source module, the stress change is analyzed through a computer, the temperature change is further obtained, meanwhile, the multiple fiber bragg grating components 33 can be simultaneously measured and averaged, the temperature detection accuracy can be further enhanced, the temperature of the kiln can be accurately detected according to the characteristics of the period change of the fiber bragg grating components 33, the height sensitivity, the response speed, the anti-interference capability and the durability of the fiber bragg gratings, the accuracy and the real-time monitoring of a temperature field in the kiln are realized, and the stability of a sintering reaction is ensured, the practicality is strong, and the device need not contact with the kiln when measuring the temperature to the kiln simultaneously, has made things convenient for the use.

Casing 1 is spherical, can increase casing 1's heated area like this, makes the mercury heating in the casing 1 more even, just so can remove simultaneously through a plurality of displacement assembly 32 of the even promotion of mercury to guarantee temperature measurement's accuracy nature.

Wherein, the fiber grating component 33 includes a fiber grating body 331, a ceramic sleeve 332 and a metal sleeve 333, two ends of the fiber grating body 331 are respectively connected with the displacement component 32 and the demodulation device, in this embodiment, the fiber grating body 331 adopts a multimode fiber, and simultaneously, in the actual use process, the multimode fiber is in a stretching state all the time, so that when the multimode fiber is pulled, the period of the multimode fiber is changed more obviously so as to facilitate the detection of the ASE broadband light source module, the ceramic sleeve 332 is sleeved on the fiber grating body 331, the metal sleeve 333 is sleeved on the ceramic sleeve 332, the metal sleeve 333 is connected with the U-shaped tube 31 through a plurality of fixing blocks 334, the fiber grating body 331, the ceramic sleeve 332 and the metal sleeve 333 are coaxially arranged, therefore, when the displacement component 32 moves, the multimode optical fiber is pulled, the pulling period of the multimode optical fiber changes, so that the multimode optical fiber can be detected through the ASE broadband light source module, then the temperature is detected through the cooperation with a computer, meanwhile, the movement of the multimode optical fiber can be guided through the limiting action of the ceramic sleeve 332, so that the multimode optical fiber is only stretched along the axial direction of the multimode optical fiber, and therefore, contact points between the multimode optical fiber and the periphery can be reduced, the interference on the multimode optical fiber is further reduced, the temperature detection accuracy of the device can be further enhanced, meanwhile, the ceramic sleeve 332 and the multimode optical fiber can be protected through the metal sleeve 333, the ceramic sleeve 332 and the multimode optical fiber are prevented from being directly exposed outside and damaged, and the use is facilitated;

the fiber bragg grating bodies 331 in the plurality of fiber bragg grating assemblies 33 are uniformly distributed in an annular shape along the axis of one end of the U-shaped pipe 31, which is far away from the connecting pipe 2, so that the plurality of multimode fibers can be uniformly stressed, the multimode fibers can only extend along the axial direction of the multimode fibers, and the influence of the inclination of the multimode fibers on the temperature measurement precision is avoided.

Specifically, in this embodiment, the displacement assembly 32 includes a sliding block 321, a connecting shaft 322, and a fixing plate 323, the sliding block 321 is slidably disposed in the U-shaped tube 31 to form a first portion, the fixing plate 323 is disposed on a side of the U-shaped tube 31 away from the connecting tube 2 to form a second portion, two ends of the connecting shaft 322 are respectively connected to the sliding block 321 and the fixing plate 323, and the fixing plate 323 is connected to the fiber bragg grating bodies 331, so that the sliding block 321 is pushed to move after the mercury expands due to heating, and the sliding block 321 is pushed to move the fixing plate 323 through the connecting shaft 322, so that the fixing plate 323 pulls the multimode fibers, and the period of the multimode fibers changes.

Further, in this embodiment, the slider 321 is made by low expansion coefficient material, and the slider 321 adopts ceramic to make in this application, can avoid like this that the slider 321 is heated the expansion and plugs up U type pipe 31 and lead to the unable removal of slider 321, the slider 321 inflation condition of splitting U type pipe 31 rising even appears, can guarantee the stability of temperature measurement, and the practicality is strong.

In this embodiment, the U-shaped tube 31 is provided with an air pressure balancing port 34 located between the sliding block 321 and the fixing plate 323, so that when the sliding block 321 moves, the excess air in the U-shaped tube 31 is discharged outwards through the air pressure balancing port 34, thereby reducing the influence of the atmospheric pressure on the detection, and making the sliding block 321 only receive the force of mercury expansion, thereby enhancing the precision of the detection.

Preferably, the U-shaped pipe 31 is of a double-layer vacuum structure, so that the heat preservation effect of the U-shaped pipe 31 can be enhanced, and the problem that the detection precision is affected by mercury shrinkage due to heat dissipation when mercury expands in the U-shaped pipe 31 is avoided.

The working principle of the application is as follows:

in the implementation process, the shell 1 is firstly extended into the kiln, then the broadband light source is emitted to the multimode optical fiber through the ASE broadband light source module, so that reflected light is formed after some broadband light sources are reflected by the multimode optical fiber and is transmitted back to the ASE broadband light source module, a large amount of reflected light is superposed together to form light with a special wavelength, then mercury in the shell 1, the connecting pipe 2 and the U-shaped pipe 31 is influenced by the temperature of the kiln and is heated and expanded to push the sliding blocks 321 to move, so that the sliding blocks 321 push the fixing plate 323 to move through the connecting shaft 322, thereby pulling the multimode optical fibers through the fixing plate 323, simultaneously redundant air in the U-shaped pipe 31 is discharged outwards through the air pressure balancing port 34, when the multimode optical fiber is pulled, the movement of the multimode optical fiber is guided through the limiting effect of the ceramic sleeve 332, so that the multimode optical fiber is stretched only along the axial direction of the multimode optical fiber, thereby reducing contact points between the multimode optical fiber and the surrounding, further reducing the interference of the multimode optical fiber, so that the cycle of the multimode optical fiber is changed, meanwhile, the central wavelength drift signal is transmitted back to the multimode optical fiber, thereby further reducing the interference of the multimode optical fiber, further detecting the multimode optical fiber, the multimode optical fiber can be detected according to the accurate temperature change of the multimode optical fiber, the broadband light spectrum, the ASE temperature change, the detection module can be further detected, the detection sensitivity can be obtained, and the multimode optical fiber temperature change of the multimode optical fiber temperature change, and the multimode optical fiber shift, and the detection sensitivity can be further detected by the multimode optical fiber temperature change of the multimode optical fiber can be further detected, and the multimode optical fiber temperature change of the multimode optical fiber spectrum detection module, and the multimode optical fiber temperature change of the multimode optical fiber change of the kiln. Therefore, the accurate and real-time monitoring of the temperature field in the kiln is realized, the stability of the sintering reaction is ensured, and the practicability is high.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for measuring kiln temperature by optical fiber sensing, comprising:

the furnace comprises a shell (1) and a furnace body, wherein the shell (1) is used for being installed in the furnace, and an accommodating cavity is enclosed by the shell (1);

the connecting pipe (2) is arranged on the shell (1) and communicated with the accommodating cavity in the shell (1);

the optical fiber sensing assemblies (3) are provided with a plurality of groups, and the optical fiber sensing assemblies (3) are uniformly distributed in a ring shape along the axis of the connecting pipe (2);

the optical fiber sensing assembly (3) comprises a U-shaped pipe (31), a displacement assembly (32) and a plurality of optical fiber grating assemblies (33), one end of the U-shaped pipe (31) is communicated with the connecting pipe (2), the displacement assembly (32) is provided with a first part and a second part, the first part extends into the U-shaped pipe (31), the second part is connected with the optical fiber grating assemblies (33), and the other ends of the optical fiber grating assemblies (33) are used for being connected with demodulation equipment provided with a computer;

the U-shaped pipe (31), the connecting pipe (2) and the accommodating cavity in the shell (1) are filled with heated expansion liquid (4), and when the heated expansion liquid (4) is heated, the heated expansion liquid (4) pushes the first part to move in the direction away from the U-shaped pipe (31).

2. The apparatus for measuring kiln temperature using optical fiber sensing as claimed in claim 1, wherein:

the fiber grating component (33) comprises a fiber grating body (331), a ceramic sleeve (332) and a metal sleeve (333), two ends of the fiber grating body (331) are respectively connected with the displacement component (32) and the demodulation equipment, the ceramic sleeve (332) is sleeved on the fiber grating body (331), the metal sleeve (333) is sleeved on the ceramic sleeve (332), the metal sleeve (333) is connected with the U-shaped pipe (31) through a plurality of fixing blocks (334), and the fiber grating body (331), the ceramic sleeve (332) and the metal sleeve (333) are coaxially arranged;

the fiber bragg grating bodies (331) in the fiber bragg grating assemblies (33) are uniformly distributed in an annular shape along the axis of one end, far away from the connecting pipe (2), of the U-shaped pipe (31).

3. The apparatus for measuring kiln temperature using optical fiber sensing as claimed in claim 2, wherein:

the displacement assembly (32) comprises a sliding block (321), a connecting shaft (322) and a fixing plate (323), the sliding block (321) is arranged in the U-shaped pipe (31) in a sliding mode to form a first part, the fixing plate (323) is arranged on one side, away from the connecting pipe (2), of the U-shaped pipe (31) to form a second part, two ends of the connecting shaft (322) are connected with the sliding block (321) and the fixing plate (323) respectively, and the fixing plate (323) is connected with the fiber bragg grating bodies (331).

4. An apparatus for measuring kiln temperature by optical fiber sensing as claimed in claim 3, wherein:

the slider (321) is made of a low expansion coefficient material.

5. An apparatus for measuring kiln temperature by optical fiber sensing as claimed in claim 3, wherein:

an air pressure balancing port (34) positioned between the sliding block (321) and the fixed plate (323) is formed in the U-shaped pipe (31).

6. The apparatus for measuring kiln temperature using optical fiber sensing as claimed in claim 1, wherein:

the U-shaped pipe (31) is of a double-layer vacuum structure.

7. The apparatus for measuring kiln temperature using optical fiber sensing as claimed in claim 1, wherein:

the shell (1) is spherical.