Circulating fluidized bed boiler bed material temperature distribution measuring device and method

Abstract

The invention provides a circulating fluidized bed boiler bed layer material temperature distribution measuring device and method, and the device comprises a plurality of distributed optical fibers which are arranged in a bed layer along a first direction in a bed layer plane, and are provided with a plurality of detection points in the first direction, the plurality of distributed optical fibers are distributed at intervals along a second direction in the bed plane, and a preset angle is formed between the first direction and the second direction; a plurality of light-emitting ends of the measurement module are connected with the light inlet ends of the plurality of distributed optical fibers respectively, and a plurality of detection ends of the measurement module are connected with the light outlet ends of the plurality of distributed optical fibers. According to the circulating fluidized bed boiler bed layer material temperature distribution measuring device and method, the temperatures of the detection points are obtained according to the characteristic changes of the optical signals in the distributed optical fibers, and the material temperature distribution of the bed layer is obtained according to the temperatures of the multiple detection points; and safe and stable operation of the boiler is ensured by utilizing temperature distribution of bed materials.

Description

Technical Field

[0001] The present disclosure relates to the technical field of circulating fluidized bed boilers, and in particular to a device and method for measuring the temperature distribution of bed materials in a circulating fluidized bed boiler. Background Art

[0002] As an efficient and clean combustion equipment, circulating fluidized bed boiler plays an important role in power and heat production and comprehensive resource utilization. During the operation of circulating fluidized bed boiler, bed temperature directly affects combustion and pollutant generation. Too high or too low bed temperature may lead to coking or incomplete combustion, excessive pollutant emissions and other problems. Therefore, accurate measurement of bed temperature is crucial for the safe operation of the boiler.

[0003] At present, the measurement of the bed temperature of circulating fluidized bed boilers mainly relies on thermocouple insertion temperature measurement technology, however, this technology has obvious limitations. Specifically, due to the limited number of thermocouple measurement points and the fact that they can only be arranged around the furnace, it is impossible to directly measure the temperature in the center of the bed. In the low-load operation of the boiler, as well as the fire suppression and fire raising process to improve the operating flexibility, due to the lack of necessary temperature data, it is difficult for operators to accurately judge the temperature distribution of the materials in the bed, thus affecting the safe and stable operation of the boiler. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the purpose of the present disclosure is to provide a device and method for measuring the temperature distribution of bed materials in a circulating fluidized bed boiler.

[0006] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a circulating fluidized bed boiler bed material temperature distribution measuring device, comprising: a plurality of distributed optical fibers, the distributed optical fibers are arranged in the bed along a first direction in the bed plane, and the distributed optical fibers have a plurality of detection points in the first direction, and the plurality of distributed optical fibers are spaced and distributed along a second direction in the bed plane, wherein the first direction and the second direction are at a preset angle; a measuring module, the plurality of light-emitting ends of the measuring module are respectively connected to the light-inlet ends of the plurality of distributed optical fibers, and the plurality of detection ends of the measuring module are connected to the light-outlet ends of the plurality of distributed optical fibers, the measuring module is used to obtain the temperature of the detection points according to the characteristic changes of light in the distributed optical fibers, and to obtain the material temperature distribution of the bed according to the temperatures of the plurality of detection points; a plurality of protective thermal conductive sleeves, the plurality of protective thermal conductive sleeves are respectively sleeved on the plurality of distributed optical fibers.

[0007] Optionally, the protective thermal conductive sleeve includes: a protective tile and a plurality of buckle rings, wherein the plurality of buckle rings are arranged on the protective tile at intervals along the first direction, and a sleeve hole is formed between the plurality of buckle rings and the protective tile; wherein the distributed optical fiber passes through the sleeve hole, and the protective tile is located on the fire-facing side of the distributed optical fiber, and the buckle ring is located on the back-fire side of the distributed optical fiber.

[0008] Optionally, the plurality of detection points in the distributed optical fiber are evenly distributed in the first direction, and the plurality of distributed optical fibers are evenly distributed in the second direction, so that the plurality of detection points are arranged in a matrix on the bed plane.

[0009] Optionally, the air distribution plate of the bed layer is provided with a plurality of wind hoods, and the plurality of distributed optical fibers are respectively arranged on the plurality of wind hoods.

[0010] Optionally, the multiple hoods include: multiple first hood groups and multiple second hood groups, the multiple first hood groups and the multiple second hood groups are spaced apart in the second direction, and the first hood group and the second hood group respectively include: multiple hoods spaced apart along the first direction, the multiple hoods of the first hood group and the multiple hoods of the second hood group are spaced apart in the first direction; wherein, the multiple distributed optical fibers are sequentially arranged on the multiple first hood groups and the multiple second hood groups along the second direction.

[0011] Optionally, the distributed optical fiber is located on the center line of the hood.

[0012] Optionally, the measurement module includes: a transmitter, the light-emitting end of the transmitter is connected to the light input end of the distributed optical fiber; a detector, the detection end of the detector is connected to the light output end of the distributed optical fiber; a control unit, the output end of the control unit is connected to the input end of the transmitter, and the input end of the control unit is connected to the output end of the detector, the control unit is used to control the transmitter to emit light to the light input end of the distributed optical fiber, and control the detector to receive the optical signal from the light output end of the distributed optical fiber, and obtain the temperature of the detection point according to the characteristic changes of the optical signal in the distributed optical fiber, and obtain the material temperature distribution of the bed layer according to the temperatures of multiple detection points.

[0013] Optionally, the measurement module also includes: a distributed control system, the input end of the distributed control system is connected to the output end of the control unit, and the distributed control system is used to perform plane visualization processing or three-dimensional visualization processing according to the material temperature distribution of the bed layer.

[0014] A second aspect of the present disclosure provides a method for measuring the temperature distribution of materials in a circulating fluidized bed boiler bed, comprising: arranging a distributed optical fiber in the bed along a first direction in the bed plane, and arranging a plurality of the distributed optical fibers at intervals along a second direction in the bed plane, wherein the distributed optical fiber has a plurality of detection points in the first direction, and the first direction and the second direction form a preset angle; emitting light to a light input end of the distributed optical fiber, and receiving an optical signal from a light output end of the distributed optical fiber; obtaining the temperature of the detection point according to a characteristic change of the optical signal in the distributed optical fiber, and obtaining the material temperature distribution of the bed according to the temperatures of the plurality of detection points.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] Since the distributed optical fiber is arranged in the bed along a first direction in the bed plane, and the distributed optical fiber has a plurality of detection points in the first direction, and the plurality of distributed optical fibers are spaced apart and distributed along a second direction in the bed plane, the bed of the circulating fluidized bed boiler utilizes the arrangement of the plurality of distributed optical fibers to realize the distribution of the plurality of detection points at various positions, and since the plurality of light-emitting ends of the measuring module are respectively connected to the light input ends of the plurality of distributed optical fibers, and the plurality of detection ends of the measuring module are connected to the light output ends of the plurality of distributed optical fibers, the measuring module can emit light to the light input end of the distributed optical fiber, and receive the optical signal from the light output end of the distributed optical fiber, so as to obtain the temperature of the detection point according to the characteristic change of the optical signal in the distributed optical fiber, and obtain the material temperature distribution of the bed according to the temperature of the plurality of detection points, and then utilize the material temperature distribution of the bed to ensure the safe and stable operation of the boiler.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a circulating fluidized bed boiler bed material temperature distribution measuring device proposed in one embodiment of the present disclosure;

[0020] Figure 2 It is a structural schematic diagram of a protective thermal sleeve in a circulating fluidized bed boiler bed material temperature distribution measuring device proposed in an embodiment of the present disclosure;

[0021] Figure 3 It is a plane visualization processing diagram in a circulating fluidized bed boiler bed material temperature distribution measuring device proposed in an embodiment of the present disclosure;

[0022] Figure 4 It is a three-dimensional visualization processing diagram in a circulating fluidized bed boiler bed material temperature distribution measurement device proposed in an embodiment of the present disclosure;

[0023] Figure 5 It is a flow chart of a method for measuring temperature distribution of bed material of a circulating fluidized bed boiler proposed in one embodiment of the present disclosure;

[0024] As shown in the figure: 1. Distributed optical fiber;

[0025] 2. Protective thermal sleeve, 21. Protective tile, 22. Buckle;

[0026] 100, first hood group, 200, second hood group;

[0027] 101. Hood. DETAILED DESCRIPTION

[0028] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0029] like Figure 1 As shown, the embodiment of the present disclosure proposes a circulating fluidized bed boiler bed material temperature distribution measuring device, comprising: a plurality of distributed optical fibers 1 and a measuring module (not shown in the figure), the distributed optical fibers 1 are arranged in the bed along a first direction in the bed plane, and the distributed optical fibers 1 have a plurality of detection points in the first direction, the plurality of distributed optical fibers 1 are distributed at intervals along a second direction in the bed plane, wherein the first direction and the second direction are at a preset angle, a plurality of light-emitting ends of the measuring module are respectively connected to the light input ends of the plurality of distributed optical fibers 1, and a plurality of detection ends of the measuring module are connected to the light output ends of the plurality of distributed optical fibers 1, the measuring module is used to obtain the temperature of the detection point according to the characteristic change of light in the distributed optical fiber 1, and to obtain the material temperature distribution of the bed according to the temperature of the plurality of detection points.

[0030] It can be understood that, since the distributed optical fiber 1 is arranged in the bed along a first direction in the bed plane, and the distributed optical fiber 1 has multiple detection points in the first direction, and the multiple distributed optical fibers 1 are spaced apart along a second direction in the bed plane, the bed of the circulating fluidized bed boiler utilizes the arrangement of multiple distributed optical fibers 1 to achieve the distribution of multiple detection points at various positions, and since the multiple light-emitting ends of the measuring module are respectively connected to the light input ends of the multiple distributed optical fibers 1, and the multiple detection ends of the measuring module are connected to the light output ends of the multiple distributed optical fibers 1, the measuring module can emit light to the light input end of the distributed optical fiber 1, and receive the optical signal from the light output end of the distributed optical fiber 1, so as to obtain the temperature of the detection point according to the characteristic change of the optical signal in the distributed optical fiber 1, and obtain the material temperature distribution of the bed according to the temperature of the multiple detection points, and then utilize the material temperature distribution of the bed to ensure the safe and stable operation of the boiler.

[0031] It should be noted that, compared with the traditional thermocouple insertion temperature measurement, this embodiment can achieve comprehensive measurement of the temperature inside the bed by arranging multiple distributed optical fibers 1 in the bed layer, which helps to more accurately grasp the temperature distribution inside the bed layer, thereby optimizing the operation adjustment of the boiler and ensuring the safe and stable operation of the boiler.

[0032] In addition, the measurement module and the distributed optical fiber 1 constitute an optical fiber sensor, which has the characteristics of high temperature resistance, wear resistance, and long signal transmission distance. It is suitable for the high temperature, high ash, and high wear environment of the circulating fluidized bed boiler. Therefore, the optical fiber temperature measurement method of this embodiment can accurately measure the bed temperature.

[0033] At the same time, by analyzing the temperature distribution data inside the bed, the air volume passing through the hood 101 can be adjusted to optimize the fluidization state of the bed, which helps to improve the combustion efficiency of the boiler and reduce energy consumption. Moreover, accurate bed temperature measurement data can also help operators better understand the operating status of the boiler, detect abnormal conditions in a timely manner and take measures, thereby improving the safe operation level of the boiler.

[0034] In summary, by laying distributed optical fibers 1 in the bed layer, real-time monitoring of the temperature inside the bed layer can be achieved. By analyzing the temperature distribution data inside the bed layer, it can provide important reference for operation adjustment, fault diagnosis and optimization transformation of the boiler.

[0035] The working principle of the circulating fluidized bed boiler is based on the fluidization process, that is, the process in which solid particles are transformed into a fluid-like state by contact with gas or liquid. In the circulating fluidized bed boiler, gas (usually air) is uniformly discharged into the combustion chamber by the air caps 101 of the air distribution plate, and the solid fuel particles and gas are mixed and burned in the combustion chamber to form a fluidized combustion environment. The fine solid particles carried out of the furnace by the flue gas are separated by the gas-solid material separator and then sent back to the furnace for circulation combustion.

[0036] The distributed optical fiber 1 and the measuring module constitute a distributed optical fiber sensor. The distributed optical fiber 1, as the sensing part in the distributed optical fiber sensor, has multiple detection points. The specific type of the distributed optical fiber 1 can be set according to actual needs and is not limited to this. For example, the light input end and the light output end of the distributed optical fiber 1 are the same port, and the tail of the distributed optical fiber 1 is a closed structure. The measuring module emits light from the port of the distributed optical fiber 1 and receives an optical signal from the port. The temperature of different detection points is obtained according to the wavelength information corresponding to different detection points contained in the optical signal. For example: 10 gratings are engraved on the distributed optical fiber 1, and 10 wavelengths, that is, 10 temperatures, will be returned.

[0037] Multiple detection points in each distributed optical fiber 1 are distributed at intervals along the first direction, and multiple distributed optical fibers 1 are distributed at intervals along the second direction, thereby realizing the longitude and latitude distribution of the detection points in the bed layer. The first direction and the second direction are both located in the plane direction of the bed layer, and the first direction and the second direction can be set according to actual needs, without limitation. For example, the first direction and the second direction are perpendicular.

[0038] The measurement module serves as the processing part in the distributed optical fiber sensor. It is used to obtain the temperature of the detection point according to the characteristic changes of light in the distributed optical fiber 1, and then obtain the material temperature distribution of the bed layer according to the temperatures of multiple detection points. The specific type of the measurement module can be set according to actual needs and is not limited to this.

[0039] like Figure 2 As shown, in this embodiment, the device further includes: a plurality of protective thermal conductive sleeves 2, and the plurality of protective thermal conductive sleeves 2 are respectively sleeved on the plurality of distributed optical fibers 1.

[0040] It can be understood that since the protective thermal conductive sleeve 2 is mounted on the distributed optical fiber 1, the protective thermal conductive sleeve 2 can utilize its own protective thermal conductive performance to achieve the protective thermal conductivity of the distributed optical fiber 1, thereby having a longer service life while not affecting the temperature of each position of the bed layer detected by the distributed optical fiber 1.

[0041] It should be noted that the distributed optical fiber 1 is arranged in the bed layer, and there is a large amount of fuel moving under the action of gas in the bed layer. Although the distributed optical fiber 1 itself has excellent anti-wear properties, its life will still be affected by long-term impact and friction. The use of the protective thermal conductive sleeve 2 on the distributed optical fiber 1 can avoid direct impact and friction of the fuel on the distributed optical fiber 1, thereby effectively protecting the distributed optical fiber 1. At the same time, when the protective thermal conductive sleeve 2 is severely worn, only the protective thermal conductive sleeve 2 can be replaced, thereby realizing low-cost continuous detection of the distributed optical fiber 1. Among them, the specific type of the protective thermal conductive sleeve 2 can be set according to actual needs, and there is no limitation to this. For example, the protective thermal conductive sleeve 2 can be made of composite materials and can withstand high temperatures of 1200°C.

[0042] like Figure 2 As shown, in some embodiments, the protective thermal conductive sleeve 2 includes: a protective tile 21 and a plurality of buckle rings 22, wherein the plurality of buckle rings 22 are arranged on the protective tile 21 at intervals along a first direction, and a sleeve hole is formed between the plurality of buckle rings 22 and the protective tile 21. The distributed optical fiber 1 passes through the sleeve hole, and the protective tile 21 is located on the fire-facing side of the distributed optical fiber 1, and the buckle ring 22 is located on the fire-repelling side of the distributed optical fiber 1.

[0043] It can be understood that, since the distributed optical fiber 1 passes through the sleeve holes between multiple buckle rings 22 and protective tiles 21, and the protective tiles 21 are located on the fire-facing side of the distributed optical fiber 1, and the buckle rings 22 are located on the back-fire side of the distributed optical fiber 1, the distributed optical fiber 1 can be protected by the protective tiles 21. At the same time, the arrangement of the buckle rings 22 not only reduces the material used for the protective thermal conductive sleeve 2 and reduces the protection cost of the distributed optical fiber 1, but also reduces the shielding area of ​​the protective thermal conductive sleeve 2 on the distributed optical fiber 1, thereby ensuring that the distributed optical fiber 1 accurately detects the temperature of each position of the bed.

[0044] It should be noted that the protective tile 21 and multiple buckle rings 22 constitute a protective thermal conductive sleeve 2 with a sleeve hole. The specific types of the protective tile 21 and the buckle ring 22 can be set according to actual needs and are not limited to this. For example, the cross-sections of the protective tile 21 and the buckle ring 22 are both semicircular rings, and the length of the protective tile 21 is adapted to the length of the distributed optical fiber 1, while the length of the buckle ring 22 is smaller and only serves to fix the protective tile 21 on the distributed optical fiber 1.

[0045] In some embodiments, the multiple detection points in the distributed optical fiber 1 are evenly distributed in the first direction, and the multiple distributed optical fibers 1 are evenly distributed in the second direction, so that the multiple detection points are arranged in a matrix on the bed plane.

[0046] It can be understood that since the multiple detection points in the distributed optical fiber 1 are evenly distributed in the first direction, and the multiple distributed optical fibers 1 are evenly distributed in the second direction, multiple detection points arranged in a matrix are formed in the bed layer, and then the arrangement of multiple detection points is used to achieve comprehensive detection of the bed temperature.

[0047] It should be noted that the spacing between adjacent detection points in the distributed optical fiber 1 and the spacing between adjacent distributed optical fibers 1 can be set according to actual needs and are not limited thereto.

[0048] like Figure 1 As shown, in some embodiments, the air distribution plate of the bed layer is provided with a plurality of wind hoods 101 , and a plurality of distributed optical fibers 1 are respectively arranged on the plurality of wind hoods 101 .

[0049] It can be understood that since multiple distributed optical fibers 1 are respectively arranged on multiple wind hoods 101, the distributed optical fibers 1 are arranged in the bed layer by using the wind hoods 101 of the air distribution plate. At the same time, by using the position of the wind hoods 101 in the bed layer, the distributed optical fibers 1 can more accurately detect the temperature of each position in the bed layer, thereby ensuring the accurate acquisition of the temperature distribution of the bed material.

[0050] It should be noted that the hood 101 is installed on the air distribution plate to support the material in the furnace and ensure that the airflow through the air distribution plate is evenly distributed to avoid uneven combustion caused by excessive or insufficient local airflow. In addition, the small hole design of the hood 101 allows the airflow to pass through and fluidize the material, so that the material remains suspended in the furnace, thereby achieving efficient combustion and heat transfer. At the same time, the resistance characteristics of the hood 101 have an important influence on the stability of the bed and the uniformity of fluidization.

[0051] The installation method of the distributed optical fiber 1 on the wind cap 101 can be set according to actual needs and is not limited to this. For example, the distributed optical fiber 1 is welded on the wind cap 101 to prevent it from falling off and can expand freely. Each distributed optical fiber 1 is installed in the bed layer using multiple wind caps 101.

[0052] like Figure 1 As shown, in some embodiments, the plurality of hoods 101 include: a plurality of first hood groups 100 and a plurality of second hood groups 200, the plurality of first hood groups 100 and the plurality of second hood groups 200 are spaced apart in the second direction, and the first hood group 100 and the second hood group 200 respectively include: a plurality of hoods 101 spaced apart along the first direction, the plurality of hoods 101 of the first hood group 100 and the plurality of hoods 101 of the second hood group 200 are spaced apart in the first direction. Among them, the plurality of distributed optical fibers 1 are sequentially arranged on the plurality of first hood groups 100 and the plurality of second hood groups 200 along the second direction.

[0053] It can be understood that since the multiple first hood groups 100 and the multiple second hood groups 200 are distributed at intervals in the second direction, and the multiple hoods 101 of the first hood group 100 and the multiple hoods 101 of the second hood group 200 are distributed at intervals in the first direction, a plurality of evenly distributed hoods 101 are formed in the bed layer, so that when the multiple distributed optical fibers 1 are sequentially arranged on the multiple first hood groups 100 and the multiple second hood groups 200 along the second direction, the distributed optical fibers 1 can be stably and evenly arranged in the bed layer.

[0054] It should be noted that the hoods 101 of the first hood group 100 and the hoods 101 of the second hood group 200 are both hoods 101. In order to make the first hood group 100 and the second hood group 200 more compactly arranged, the hoods 101 in the first hood group 100 and the hoods 101 in the second hood group 200 can be arranged to be relatively deflected 45 degrees in the horizontal direction to avoid each other's air outlet structures.

[0055] like Figure 1 As shown, in some embodiments, the distributed optical fiber 1 is located on the center line of the hood 101 .

[0056] It can be understood that, since the distributed optical fiber 1 is located on the center line of the wind hood 101, the distributed optical fiber 1 can not only be stably arranged on the wind hood 101, but also is located close to the material, and can more accurately reflect the temperature in the bed.

[0057] It should be noted that the wind hood 101 has multiple center lines in the bed plane direction, and the distributed optical fiber 1 is located on the center lines of the multiple wind hoods 101 that overlap with each other in the first direction. It can also be understood that the distributed optical fiber 1 is arranged on the top of the wind hood 101.

[0058] There are various types of hoods 101 , and the figure only shows an example, which is not limited to this type.

[0059] In some embodiments, the measurement module includes: a transmitter, a detector and a control unit, the light-emitting end of the transmitter is connected to the light input end of the distributed optical fiber 1, the detection end of the detector is connected to the light output end of the distributed optical fiber 1, the output end of the control unit is connected to the input end of the transmitter, and the input end of the control unit is connected to the output end of the detector, the control unit is used to control the transmitter to emit light to the light input end of the distributed optical fiber 1, and control the detector to receive the optical signal at the light output end of the distributed optical fiber 1, and obtain the temperature of the detection point according to the characteristic changes of the optical signal in the distributed optical fiber 1, and obtain the material temperature distribution of the bed layer according to the temperatures of multiple detection points.

[0060] It can be understood that, since the light-emitting end of the transmitter is connected to the light-input end of the distributed optical fiber 1, and the output end of the control unit is connected to the input end of the transmitter, the control unit can control the transmitter to emit light to the light-input end of the distributed optical fiber 1. At the same time, since the detection end of the detector is connected to the light-output end of the distributed optical fiber 1, and the input end of the control unit is connected to the output end of the detector, the control unit can control the detector to receive the light signal from the light-output end of the distributed optical fiber 1. Thus, by utilizing the emission and reception of light, the control unit obtains the temperature of the detection point according to the characteristic changes of the light signal in the distributed optical fiber 1, thereby obtaining the material temperature distribution of the bed layer according to the temperatures of multiple detection points, and then utilizing the material temperature distribution of the bed layer to ensure the safe and stable operation of the boiler.

[0061] It should be noted that the transmitter is used to transmit light to the light input end of the distributed optical fiber 1, and the specific type of the transmitter can be set according to actual needs and is not limited to this.

[0062] The detector is used to receive the optical signal at the light output end of the distributed optical fiber 1. The specific type of the detector can be set according to actual needs and is not limited to this.

[0063] The control unit is used to control the emitter and the detector, and to obtain the temperature of the detection point according to the characteristic changes of the optical signal in the distributed optical fiber 1, and to obtain the material temperature distribution of the bed layer according to the temperatures of multiple detection points. The specific type of the control unit can be set according to actual needs and is not limited to this.

[0064] like Figure 3 and Figure 4 As shown, in some embodiments, the measurement module also includes: a distributed control system (DCS), the input end of the distributed control system is connected to the output end of the control unit, and the distributed control system is used to perform plane visualization processing or three-dimensional visualization processing according to the temperature distribution of the material in the bed.

[0065] It can be understood that since the input end of the distributed control system is connected to the output end of the control unit, the distributed control system can perform plane visualization processing or three-dimensional visualization processing according to the temperature distribution of the material in the bed, thereby realizing intuitive monitoring of the temperature distribution of the material in the bed by plane visualization processing or three-dimensional visualization processing.

[0066] In the device of this embodiment, a distributed optical fiber 1 is arranged on the wind cap 101 on the air distribution plate of the circulating fluidized bed boiler. This arrangement enables the optical fiber sensor to be closer to the bed material, thereby obtaining more accurate temperature data; in view of the high temperature and high wear environment of the circulating fluidized bed boiler, the high temperature resistant and wear-resistant structure of the distributed optical fiber 1 and the protective thermal sleeve 2 can ensure its stability and reliability in harsh environments; after the temperature distribution of the bed material is measured by the optical fiber sensor, the data is transmitted to the DCS for visualization processing, and the temperature distribution is clear and intuitive.

[0067] like Figure 5 As shown, the embodiment of the present disclosure also provides a method for measuring the temperature distribution of bed materials in a circulating fluidized bed boiler, comprising:

[0068] S1: Distributed optical fiber 1 is arranged in a bed layer along a first direction in a bed layer plane, and multiple distributed optical fibers 1 are arranged at intervals along a second direction in the bed layer plane, wherein the distributed optical fiber 1 has multiple detection points in the first direction, and the first direction and the second direction form a preset angle;

[0069] S2: emitting light to the light input end of the distributed optical fiber 1, and receiving the optical signal from the light output end of the distributed optical fiber 1;

[0070] S3: Obtain the temperature of the detection point according to the characteristic change of the optical signal in the distributed optical fiber 1, and obtain the material temperature distribution of the bed layer according to the temperatures of multiple detection points.

[0071] It can be understood that the distributed optical fiber 1 is arranged in the bed along a first direction in the bed plane, and multiple distributed optical fibers 1 are arranged at intervals along a second direction in the bed plane, and the distributed optical fiber 1 has multiple detection points in the first direction, so that the bed of the circulating fluidized bed boiler utilizes the arrangement of multiple distributed optical fibers 1 to achieve the distribution of multiple detection points at various positions, and emits light to the light input end of the distributed optical fiber 1, and receives the optical signal at the light output end of the distributed optical fiber 1, so as to obtain the temperature of the detection point according to the characteristic change of the optical signal in the distributed optical fiber 1, and obtain the material temperature distribution of the bed according to the temperatures of the multiple detection points, and then utilize the temperature distribution of the bed material to ensure the safe and stable operation of the boiler.

[0072] In the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0073] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A circulating fluidized bed boiler bed material temperature distribution measuring device, characterized in that: include: A plurality of distributed optical fibers, wherein the distributed optical fibers are arranged in the bed layer along a first direction in the bed layer plane, and the distributed optical fibers have a plurality of detection points in the first direction, and the plurality of distributed optical fibers are distributed at intervals along a second direction in the bed layer plane, wherein the first direction and the second direction form a preset angle; A measuring module, wherein the multiple light-emitting ends of the measuring module are respectively connected to the light-incoming ends of the multiple distributed optical fibers, and the multiple detection ends of the measuring module are connected to the light-emitting ends of the multiple distributed optical fibers, and the measuring module is used to obtain the temperature of the detection point according to the characteristic change of the optical signal in the distributed optical fiber, and to obtain the material temperature distribution of the bed layer according to the temperatures of the multiple detection points; A plurality of protective thermal conductive sleeves are respectively sleeved on a plurality of the distributed optical fibers.

2. The circulating fluidized bed boiler bed material temperature distribution measuring device according to claim 1, characterized in that: The protective thermal sleeve comprises: A protective tile and a plurality of buckles, wherein the plurality of buckles are arranged on the protective tile at intervals along the first direction, and sleeve holes are formed between the plurality of buckles and the protective tile; The distributed optical fiber passes through the ferrule, the protective tile is located on the fire-facing side of the distributed optical fiber, and the buckle is located on the non-fire-facing side of the distributed optical fiber.

3. The circulating fluidized bed boiler bed material temperature distribution measuring device according to claim 1, characterized in that: The plurality of detection points in the distributed optical fiber are evenly distributed in the first direction, and the plurality of distributed optical fibers are evenly distributed in the second direction, so that the plurality of detection points are arranged in a matrix on the bed plane.

4. The device for measuring the temperature distribution of bed material in a circulating fluidized bed boiler according to claim 1, characterized in that: The air distribution plate of the bed layer is provided with a plurality of wind hoods, and the plurality of distributed optical fibers are respectively arranged on the plurality of wind hoods.

5. The device for measuring the temperature distribution of bed material in a circulating fluidized bed boiler according to claim 4, characterized in that: The plurality of hoods include: A plurality of first hood groups and a plurality of second hood groups, the plurality of the first hood groups and the plurality of the second hood groups are spaced apart in the second direction, and the first hood group and the second hood group respectively include: a plurality of the hoods spaced apart along the first direction, the plurality of the hoods of the first hood group and the plurality of the hoods of the second hood group are spaced apart in the first direction; Wherein, a plurality of the distributed optical fibers are sequentially arranged on a plurality of the first hood groups and a plurality of the second hood groups along the second direction.

6. The circulating fluidized bed boiler bed material temperature distribution measuring device according to claim 4, characterized in that: The distributed optical fiber is located on the center line of the hood.

7. The device for measuring the temperature distribution of bed material in a circulating fluidized bed boiler according to claim 1, characterized in that: The measurement module comprises: A transmitter, wherein the light-emitting end of the transmitter is connected to the light-incoming end of the distributed optical fiber; A detector, wherein a detection end of the detector is connected to a light output end of the distributed optical fiber; A control unit, wherein the output end of the control unit is connected to the input end of the transmitter, and the input end of the control unit is connected to the output end of the detector, the control unit is used to control the transmitter to emit light to the light input end of the distributed optical fiber, and control the detector to receive the optical signal from the light output end of the distributed optical fiber, and obtain the temperature of the detection point according to the characteristic change of the optical signal in the distributed optical fiber, and obtain the material temperature distribution of the bed layer according to the temperatures of multiple detection points.

8. The device for measuring the temperature distribution of bed material in a circulating fluidized bed boiler according to claim 7, characterized in that: The measurement module also includes: A distributed control system, wherein the input end of the distributed control system is connected to the output end of the control unit, and the distributed control system is used to perform plane visualization processing or three-dimensional visualization processing according to the temperature distribution of the material in the bed.

9. A method for measuring the temperature distribution of bed material in a circulating fluidized bed boiler, characterized in that: include: Arrange a distributed optical fiber in the bed layer along a first direction in the bed layer plane, and arrange a plurality of the distributed optical fibers at intervals along a second direction in the bed layer plane, wherein the distributed optical fiber has a plurality of detection points in the first direction, and the first direction and the second direction form a preset angle; Transmitting light to the light input end of the distributed optical fiber and receiving the optical signal from the light output end of the distributed optical fiber; The temperature of the detection point is obtained according to the characteristic change of the optical signal in the distributed optical fiber, and the material temperature distribution of the bed layer is obtained according to the temperatures of the multiple detection points.

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