Device and method for directly measuring temperature in circulating fluidized bed boiler

Abstract

The invention discloses a device and a method for directly measuring the temperature in a circulating fluidized bed boiler. The direct measuring device for the temperature in the circulating fluidized bed boiler comprises an optical fiber, a plurality of supporting assemblies and a lead assembly, and the optical fiber is provided with a plurality of temperature measuring points; the supporting assemblies are arranged on an anti-abrasion grating in the circulating fluidized bed boiler at intervals, the optical fiber is supported on the supporting assemblies so that the optical fiber can be arranged on a furnace wall of the circulating fluidized bed boiler along a preset path, and multi-point temperature measurement is conducted on the interior of the circulating fluidized bed boiler through a plurality of temperature measurement points on the optical fiber; the lead assembly is arranged on the furnace wall of the circulating fluidized bed boiler, one end of the lead assembly extends into the circulating fluidized bed boiler, the other end of the lead assembly extends out of the circulating fluidized bed boiler, and part of the optical fiber penetrates through the lead assembly. The device for directly measuring the temperature in the circulating fluidized bed boiler can accurately measure the temperature of the fire facing side, continuous and accurate measurement is achieved, and arrangement and later maintenance are convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler temperature monitoring, and in particular relates to a device and method for directly measuring the temperature inside a circulating fluidized bed boiler. Background Art

[0002] Temperature measurement is a crucial link in circulating fluidized bed boilers. Temperature is an important parameter that reflects the combustion conditions in the furnace. If the operating temperature field of the boiler cannot be reflected in real time, the operating personnel will misjudge the boiler operating conditions, which is mainly manifested in the following aspects: (1) Combustion optimization: The combustion efficiency of CFB boilers is closely related to temperature; (2) Safety monitoring: Too high temperature may cause coking, and too low temperature may cause unstable combustion; (3) Startup and shutdown: During the start-up and shutdown of the boiler, temperature control is crucial; (4) Environmental emissions: Temperature affects the generation of pollutants such as NOx; (5) Desulfurization efficiency: For CFB boilers that require desulfurization, the temperature should be controlled within an appropriate range (such as 850-870°C). Misjudgment of the operating temperature field will lead to low utilization of desulfurizers (such as limestone); (6) Automated control: CFB boilers are usually equipped with automated control systems, and temperature measurement data is an important basis for system adjustment and optimized operation.

[0003] Therefore, temperature measurement is crucial to the stable, efficient and safe operation of CFB boilers. It is one of the core contents of boiler operation monitoring. Mastering the accurate temperature distribution in the furnace is crucial for safe and stable operation and optimizing the combustion process. Summary of the invention

[0004] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0005] The inventors have realized that the current temperature measurement methods for boilers in the related art include direct measurement (inserted thermocouples) and indirect measurement (acoustic temperature measurement technology, infrared image temperature measurement technology, etc.). Thermocouple direct measurement technology determines the temperature by measuring the thermoelectric potential difference between two different metals; furnace acoustic temperature measurement technology is a method of measuring the temperature inside the furnace using the relationship between sound waves and temperature; infrared image temperature measurement technology uses the infrared radiation emitted by an object to measure its surface temperature.

[0006] In order to meet the operation and safety requirements, the thermocouple direct measurement technology must find a suitable location to install the thermocouple in the furnace. This method can only obtain limited temperature data. Each thermocouple has a set of signal wires. Overall, there are many signal cables, and the later maintenance workload is large. In addition, due to the existence of the side wall flow in the furnace, the inserted thermocouple is also easily damaged and needs to be replaced frequently. Coal powder combustion will form a visible flame. Many conventional pulverized coal furnaces use optical flame monitoring devices. The flame that can be attributed to a burner cannot be seen in the furnace of the circulating fluidized bed boiler, so it is impossible to use optical methods for flame monitoring.

[0007] The inventors also realized that optical fiber temperature measurement in the related technology has been applied to the detection of the back-fire side outside the furnace, but has not been applied to the scenario with complex working conditions such as the fire side inside the furnace.

[0008] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0009] To this end, an embodiment of the present invention proposes a direct measurement device for the temperature inside a circulating fluidized bed boiler furnace, which can accurately measure the temperature on the fire side, increase the coverage area of ​​the temperature measurement points, achieve continuous and accurate measurement, and facilitate layout and subsequent maintenance.

[0010] The embodiment of the present invention also proposes a direct measurement method.

[0011] The direct measurement device for the temperature in a circulating fluidized bed boiler furnace according to an embodiment of the present invention comprises:

[0012] An optical fiber, wherein the optical fiber has a plurality of temperature measurement points;

[0013] A plurality of support assemblies, wherein the plurality of support assemblies are arranged at intervals on the anti-wear grid in the circulating fluidized bed boiler, and the optical fiber is supported on the plurality of support assemblies, so that the optical fiber is arranged on the furnace wall of the circulating fluidized bed boiler along a preset path, and the temperature in the furnace of the circulating fluidized bed boiler is measured at multiple points through the plurality of temperature measuring points on the optical fiber;

[0014] A lead wire assembly is arranged on the furnace wall of a circulating fluidized bed boiler, one end of the lead wire assembly extends into the furnace of the circulating fluidized bed boiler, and the other end extends outside the furnace of the circulating fluidized bed boiler, and a partial section of the optical fiber is passed through the lead wire assembly to lead the optical fiber out of the circulating fluidized bed boiler.

[0015] The device for directly measuring the temperature in the circulating fluidized bed boiler furnace of the embodiment of the present invention can accurately measure the temperature on the fire side, realize continuous and precise measurement, and facilitate layout and subsequent maintenance.

[0016] In some embodiments, there are multiple optical fibers, at least some of which are arranged along the circumference of the circulating fluidized bed boiler, and the other optical fibers are arranged along the height direction of the circulating fluidized bed boiler.

[0017] In some embodiments, the optical fibers arranged along the circumference of the circulating fluidized bed boiler are located at the lower side of the grid plates arranged along the horizontal direction in the anti-wear grid.

[0018] In some embodiments, the optical fiber is arranged on at least a portion of the furnace wall in the circulating fluidized bed boiler, and a plurality of the temperature measuring points are spaced and distributed in at least a portion of the corresponding furnace wall;

[0019] And / or, the interval between two adjacent temperature measuring points is 200 mm to 2000 mm;

[0020] And / or, the distance between the optical fiber and the water-cooled wall of the circulating fluidized bed boiler is 20 mm to 50 mm.

[0021] In some embodiments, a junction box is further included, and the junction box is located outside the circulating fluidized bed boiler. The optical fiber is connected to an optical fiber extension line in the junction box to connect to a data transmission system and transmit the data to an analysis and recording system.

[0022] In some embodiments, the support assembly comprises:

[0023] A connecting rod, one end of which is used to connect with the anti-wear grille;

[0024] A hanging ring is connected to the other end of the connecting rod, and the optical fiber passes through the inner cavity of the hanging ring and is supported on the hanging ring.

[0025] In some embodiments, the inner diameter of the hanging ring is larger than the outer diameter of the optical fiber;

[0026] And / or, the outer wall of the optical fiber is provided with a protective cover;

[0027] And / or, the material of the connecting rod is the same as that of the anti-wear grille and is fixed by welding;

[0028] And / or, further comprising a heat insulating coating, wherein the heat insulating coating is located on a side of the anti-wear grid close to the optical fiber.

[0029] In some embodiments, the lead assembly includes:

[0030] A fixed tube, wherein the fixed tube is fixed to a furnace wall of a circulating fluidized bed boiler, one end of the fixed tube extends into the furnace of the circulating fluidized bed boiler, and the other end of the fixed tube extends outside the furnace of the circulating fluidized bed boiler, and the optical fiber passes through an inner cavity of the fixed tube;

[0031] A heat-insulating component, the heat-insulating component is filled between the fixing tube and the optical fiber;

[0032] A sealing member is arranged at the end of the fixed pipe.

[0033] In some embodiments, the fixed pipe is fixedly connected to the water-cooled wall of the circulating fluidized bed boiler, a through hole is opened on the water-cooled wall, and one end of the fixed pipe is connected to the furnace of the circulating fluidized bed boiler through the through hole;

[0034] And / or, the fixed tube is made of the same material as the water-cooled wall of the circulating fluidized bed boiler, and the fixed tube and the water-cooled wall are fixed by welding.

[0035] The method for directly measuring the furnace temperature of a circulating fluidized bed boiler according to an embodiment of the present invention, based on the device for directly measuring the furnace temperature of the circulating fluidized bed boiler according to any one of the above embodiments, comprises:

[0036] Arranging at least one optical fiber in a circulating fluidized bed boiler furnace, wherein the optical fiber has a plurality of temperature measurement points;

[0037] The optical fiber is connected to the anti-wear grid, at least part of the optical fiber is arranged along the circumference of the circulating fluidized bed boiler and is located below the anti-wear grid, and a plurality of the temperature measuring points are distributed at intervals in at least part of the furnace wall of the circulating fluidized bed boiler;

[0038] Passing the optical fiber through the furnace wall of the circulating fluidized bed boiler to lead out the optical fiber, and connecting the optical fiber to a data transmission system;

[0039] The temperature parameters of the plurality of temperature measuring points are obtained to reflect the temperature of the temperature field in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the connection between the support assembly and the optical fiber according to an embodiment of the present invention.

[0041] Figure 2 It is a schematic diagram of the connection between the lead assembly and the optical fiber according to an embodiment of the present invention.

[0042] Figure 3 It is a schematic diagram of the connection between the water-cooled wall and the anti-wear grid.

[0043] Figure 4 4 is a flow chart of a method for directly measuring the temperature in a furnace according to an embodiment of the present invention.

[0044] Reference numerals:

[0045] 1. Optical fiber;

[0046] 2. Support assembly; 21. Connecting rod; 22. Hanging ring;

[0047] 3. Lead assembly; 31. Fixing tube; 32. Insulation component; 33. Sealing element; 34. Junction box;

[0048] 4. Anti-wear grille;

[0049] 5. Water-cooled wall; 51. Finned tube; 52. Fin; 521. Through hole. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0051] like Figure 1-Figure 3 As shown, the device for directly measuring the temperature inside a circulating fluidized bed boiler furnace according to an embodiment of the present invention comprises an optical fiber, a plurality of supporting components and a lead component.

[0052] The optical fiber has multiple temperature measuring points. The number of optical fibers can be one or more. Each optical fiber has multiple temperature sensors as temperature measuring points. When the optical fiber is arranged in the furnace, multiple temperature measuring points are set at intervals, and continuous temperature measurement can be performed on multiple points.

[0053] In an embodiment of the present invention, a plurality of support components are arranged at intervals on the anti-wear grille in the circulating fluidized bed boiler, and the optical fiber is supported on the plurality of support components, that is, each optical fiber is connected to the anti-wear grille through a plurality of support components, and a plurality of support components are arranged at intervals on a preset path of the optical fiber to ensure that the optical fiber can be effectively supported, so that the optical fiber is arranged on the furnace wall of the circulating fluidized bed boiler along the preset path, so that the temperature measuring points are reasonably distributed in the furnace, and multi-point temperature measurement is performed on the furnace of the circulating fluidized bed boiler through a plurality of temperature measuring points, thereby more accurately reacting to the temperature of the temperature field in the furnace, providing a new technical means for operating personnel to monitor the combustion state in the furnace and providing a guiding basis for adjusting the operating state of the boiler.

[0054] The lead wire assembly is arranged on the furnace wall of the circulating fluidized bed boiler, one end of the lead wire assembly extends into the furnace of the circulating fluidized bed boiler, and the other end extends outside the furnace of the circulating fluidized bed boiler, and a part of the optical fiber is passed through the lead wire assembly to lead the optical fiber out of the circulating fluidized bed boiler. The optical fiber is led out of the circulating fluidized bed boiler through the lead wire assembly so as to transmit the signal to the host computer, and further, the temperature field screen can be displayed on the host computer.

[0055] The direct measurement device for the temperature inside the circulating fluidized bed boiler furnace of the embodiment of the present invention can improve the coverage area of ​​the temperature measuring points by reasonably arranging the paths and number of optical fibers, effectively reflect the temperature of the temperature field inside the furnace, provide more reliable temperature data, avoid misjudgment by staff, and realize continuous and accurate measurement. In the embodiment of the present invention, one optical fiber can measure multiple temperature measuring points, simplifying the number of wire harnesses and cables, and facilitating layout and subsequent maintenance.

[0056] Furthermore, the temperature measurement range of the temperature measurement point in the optical fiber is 0-1200° C., and the measurement accuracy is 0.1° C., which has the advantages of a large temperature measurement range and high temperature measurement accuracy.

[0057] The embodiments of the present invention solve the problems of poor accuracy and low precision of temperature measurement in related technologies. The optical fiber temperature measurement has high accuracy, high sensitivity and high acquisition frequency, and realizes large-area, multi-point and continuous measurement of the temperature field in the furnace. One optical fiber can measure multi-point temperature data, and the subsequent maintenance is small. By acquiring the temperature field in the furnace, it provides a new technical means for operators to monitor the combustion state in the furnace and provide guidance for adjusting the operation state of the boiler.

[0058] In practical applications, the embodiments of the present invention can also optimize the combustion process by accurately measuring the temperature, ensure the full combustion of the fuel, and improve the thermal efficiency of the boiler; by real-time monitoring of the temperature, the operating parameters can be adjusted in time to prevent unsafe situations during boiler operation; accurate temperature measurement data can help control the coal feeding temperature to avoid risks such as deflagration and coking; by optimizing the temperature, the emission of pollutants can be controlled to a certain extent to meet environmental protection requirements.

[0059] In some embodiments, when there are multiple optical fibers, at least some of the optical fibers are arranged along the circumference of the circulating fluidized bed boiler, and the other optical fibers are arranged along the height direction of the circulating fluidized bed boiler. That is, since the anti-wear grid generally includes a horizontal grid plate extending in the horizontal direction and a vertical grid plate extending in the vertical direction, in order to facilitate the optical fibers to be attached to the anti-wear grid, some of the optical fibers can be arranged along the circumference of the circulating fluidized bed boiler, and the optical fibers can be attached to the horizontal grid plate through a supporting assembly. When there are optical fibers arranged in the vertical direction, the optical fibers can be attached to the vertical grid plate through a supporting assembly.

[0060] Of course, all optical fibers may also extend in the horizontal direction, and each optical fiber may be arranged along the furnace walls at the front, rear, left, and right sides of the circumference of the circulating fluidized bed boiler.

[0061] In some embodiments, the optical fiber is arranged on at least a portion of the furnace wall in the circulating fluidized bed boiler, and a plurality of temperature measurement points are distributed at intervals in at least a portion of the corresponding area on the furnace wall.

[0062] It should be understood that the optical fiber is arranged on one or more of the front furnace wall, the left furnace wall, the rear furnace wall and the right furnace wall. For example, a part of the optical fiber is arranged on the front furnace wall, the left furnace wall and the rear furnace wall. For another example, a part of the optical fiber is arranged only on the front furnace wall. For another example, a part of the optical fiber is arranged on the rear furnace wall and the right furnace wall. The embodiment of the present invention can reasonably arrange the optical fiber according to the requirements of the temperature measurement of the temperature field in the furnace, the arrangement of the temperature measurement points, etc.

[0063] Further, the optical fibers arranged along the circumference of the circulating fluidized bed boiler are located at the lower side of the grid plates arranged along the horizontal direction in the anti-wear grid.

[0064] The optical fiber is arranged at the lower part of the anti-wear grille. There is dust accumulation on the upper part of the anti-wear grille. If it is arranged at the upper part, the measurement results will be inaccurate and easy to wear. There is no dust accumulation at the lower part of the anti-wear grille and the optical fiber temperature sensor is not easily directly washed by the internal circulating material and fly ash, avoiding wear, extending the service life of the optical fiber temperature sensor, and improving stability and measurement accuracy.

[0065] After the optical fiber is arranged in the furnace, the interval between two adjacent temperature measuring points is 200mm to 2000mm; specifically, the interval between two adjacent temperature measuring points can be 200mm, 400mm, 657m, 789mm, 1200mm, 1220mm, 1800mm, or 2000mm. When the interval is too small, there will be too many temperature measuring points, which will increase the cost and difficulty of arrangement. When the interval is too large, it is easy to cause the temperature field's temperature measuring points to be too dispersed, affecting the relevance of the temperature field data. When some data are abnormal, it is not easy to eliminate the abnormal data by comparing the adjacent temperature measuring points, which is easy to cause misjudgment by the staff.

[0066] Since the inner wall of the circulating fluidized bed boiler includes a water-cooled wall and an anti-wear grille arranged on the water-cooled wall, if the optical fiber is too close to the water-cooled wall, the measured temperature will be easily affected by the water-cooled wall and distorted. In the embodiment of the present invention, the distance between the optical fiber and the water-cooled wall of the circulating fluidized bed boiler is 20 mm to 50 mm, thereby avoiding the influence of the ash flow boundary layer attached to the wall and facilitating the measurement of the real temperature.

[0067] In some embodiments, the direct measurement device of the embodiment of the present invention further includes a junction box, which is located outside the furnace of the circulating fluidized bed boiler. The optical fiber is connected to the optical fiber extension line in the junction box to connect to the data transmission system, and then the data can be transmitted to the analysis and recording system. Optionally, the analysis and recording system can be a DCS system. After the optical fiber in the furnace is led out of the circulating fluidized bed boiler through the lead assembly, the optical fiber is connected to the optical fiber extension line in the junction box and connected to the data transmission system, and the temperature signal is uploaded to the host computer to facilitate automatic and visual control.

[0068] The following combination Figure 1 The connection structure between the support assembly and the optical fiber according to the embodiment of the present invention is described as follows:

[0069] The supporting assembly comprises a connecting rod and a hanging ring, one end of the connecting rod is used to connect with the anti-wear grille; the hanging ring is connected with the other end of the connecting rod, and the optical fiber passes through the inner cavity of the hanging ring and is supported on the hanging ring.

[0070] Furthermore, the inner diameter of the hanging ring is larger than the outer diameter of the optical fiber, which facilitates the insertion of the optical fiber into the hanging ring. When the optical fiber expands due to heat, the optical fiber will not be squeezed and damaged by the hanging ring. Optionally, the inner diameter of the hanging ring is not less than 1.1 times the diameter of the optical fiber. For example, the inner diameter of the hanging ring is 1.1 times, 1.15 times or 1.2 times the diameter of the optical fiber, which can be determined based on the diameter of the optical fiber and its own thermal expansion coefficient.

[0071] The outer wall of the optical fiber is provided with a protective cover to prevent the optical fiber from being damaged due to frequent friction between the optical fiber and the hanging ring. Specifically, an alloy armor is provided on the outer wall of the optical fiber to protect the optical fiber.

[0072] In order to facilitate the connection, the material of the connecting rod in the embodiment of the present invention is the same as that of the anti-wear grille, so that the connecting rod and the anti-wear grille can be directly welded and fixed. In a high temperature environment, the performance parameters of the two are basically the same, which improves the convenience and stability of installation. Of course, the material of the hanging ring can also be the same as that of the connecting rod and the anti-wear grille, and the hanging ring and the connecting rod can be made in one piece.

[0073] A heat insulating coating is applied on the anti-wear grid, and the heat insulating coating is located on the side of the anti-wear grid close to the optical fiber, which can reduce the influence of the anti-wear grid on the temperature measurement result after heat transfer to the water-cooled wall.

[0074] Optionally, the connecting rod and the anti-wear grid are both made of rare earth alloy.

[0075] Optionally, the connecting rod may be a solid rod or a hollow round tube.

[0076] The following combination Figure 2 The connection structure of the lead assembly and the optical fiber according to the embodiment of the present invention is described as follows:

[0077] The lead assembly includes a fixed tube, a heat-insulating component and a sealing component. The fixed tube is fixed on the furnace wall of the circulating fluidized bed boiler. One end of the fixed tube extends into the furnace of the circulating fluidized bed boiler and the other end extends outside the furnace of the circulating fluidized bed boiler. The optical fiber passes through the inner cavity of the fixed tube. The heat-insulating component is filled between the fixed tube and the optical fiber. The sealing component is arranged at the end of the fixed tube. The heat-insulating component is a heat-insulating, fire-resistant and flame-retardant material, which is filled between the optical fiber and the fixed tube to avoid direct contact between the pipeline and the fixed tube. The sealing component is used to seal the two ends of the fixed tube to avoid direct exposure of the heat-insulating, fire-resistant and flame-retardant material to the outside.

[0078] Furthermore, the fixed pipe is fixedly connected to the water-cooled wall of the circulating fluidized bed boiler, a through hole is provided on the water-cooled wall, and one end of the fixed pipe is connected to the furnace of the circulating fluidized bed boiler through the through hole.

[0079] The fixed tube is made of the same material as the water-cooled wall of the circulating fluidized bed boiler. The fixed tube and the water-cooled wall are fixed by welding, which is convenient for fixing and installing the fixed tube and can also ensure the stability between the fixed tube and the water-cooled wall in a high temperature environment. Since the water-cooled wall includes finned tubes and fins, the through holes in the embodiment of the present invention are opened on the fins to avoid damage to the finned tubes, and the fixed tubes are also fixed on the fins.

[0080] like Figure 4 As shown, the direct measurement method of the furnace temperature of the circulating fluidized bed boiler furnace direct measurement device according to any one of the above embodiments of the present invention comprises:

[0081] S101. Arrange at least one optical fiber in a circulating fluidized bed boiler, wherein the optical fiber has multiple temperature measuring points. Each optical fiber can continuously and accurately detect the temperature of multiple temperature measuring points, thereby avoiding the problem of too many cables and difficulty in selecting temperature measuring points in related technologies.

[0082] S102. Connect the optical fiber to the anti-wear grille. At least part of the optical fiber is arranged along the circumference of the circulating fluidized bed boiler (of course, all of the optical fibers can also be arranged) and is located below the anti-wear grille. Multiple temperature measuring points are spaced apart in at least part of the furnace wall of the circulating fluidized bed boiler. Arranging the optical fiber below the anti-wear grille can reduce the wear of the optical fiber by fly ash or materials, thereby improving the service life of the optical fiber temperature sensor and the measurement accuracy.

[0083] S103, passing the optical fiber through the furnace wall of the circulating fluidized bed boiler to lead out the optical fiber, and connecting the optical fiber to the data transmission system, leading the optical fiber out of the circulating fluidized bed boiler, and transmitting the temperature signal to the data transmission system, thereby reflecting the temperature of the temperature field in the furnace.

[0084] S104. Obtain temperature parameters of multiple temperature measuring points to reflect the temperature of the temperature field in the furnace, and provide a new technical means for operators to monitor the combustion status in the furnace and provide guidance for adjusting the operating status of the boiler.

[0085] The embodiments of the present invention arrange the optical fibers horizontally or vertically in the height direction through the support components, lead components, and the like, and the number and intervals of the temperature measurement points can be customized, thereby achieving continuous and accurate measurement of multiple points and a large coverage area, and having better practicality. Compared with the thermocouple temperature measurement device in the related art, the optical fiber is light in weight, small in size, and uses an alloy package that is corrosion-resistant and has better stability. The optical fiber temperature measurement also has high sensitivity and high resolution, a measurement range of 0-1200°C, and a measurement accuracy of 0.1°C, which can fully meet the needs of temperature measurement in a circulating fluidized bed boiler furnace. The optical fiber temperature measurement of the embodiments of the present invention can achieve large-area, multi-point, continuous and accurate measurement, and is convenient for later maintenance.

[0086] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0090] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] Although the embodiments of the present invention 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 invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A direct measurement device for the temperature in a circulating fluidized bed boiler furnace, characterized in that: include: An optical fiber, wherein the optical fiber has a plurality of temperature measurement points; A plurality of support assemblies, wherein the plurality of support assemblies are arranged at intervals on the anti-wear grid in the circulating fluidized bed boiler, and the optical fiber is supported on the plurality of support assemblies, so that the optical fiber is arranged on the furnace wall of the circulating fluidized bed boiler along a preset path, and the temperature in the furnace of the circulating fluidized bed boiler is measured at multiple points through the plurality of temperature measuring points on the optical fiber; A lead wire assembly is arranged on the furnace wall of a circulating fluidized bed boiler, one end of the lead wire assembly extends into the furnace of the circulating fluidized bed boiler, and the other end extends outside the furnace of the circulating fluidized bed boiler, and a partial section of the optical fiber is passed through the lead wire assembly to lead the optical fiber out of the circulating fluidized bed boiler.

2. The direct measurement device for the temperature in the circulating fluidized bed boiler furnace according to claim 1, characterized in that: There are multiple optical fibers, at least some of which are arranged along the circumference of the circulating fluidized bed boiler, and the other optical fibers are arranged along the height direction of the circulating fluidized bed boiler.

3. The direct measurement device for the temperature in the circulating fluidized bed boiler furnace according to claim 2, characterized in that: The optical fibers arranged along the circumference of the circulating fluidized bed boiler are located at the lower side of the grid plates arranged along the horizontal direction in the anti-wear grid.

4. The direct measurement device for the temperature in the circulating fluidized bed boiler furnace according to claim 1, characterized in that: The optical fiber is arranged on at least a portion of the furnace wall in the circulating fluidized bed boiler, and a plurality of the temperature measuring points are distributed at intervals in at least a portion of the corresponding furnace wall; And / or, the interval between two adjacent temperature measuring points is 200 mm to 2000 mm; and / or, the distance between the optical fiber and the water-cooled wall of the circulating fluidized bed boiler is 20 mm to 50 mm; And / or, the temperature measurement range of the temperature measurement point on the optical fiber is 0-1200°C, and the measurement accuracy is 0.1°C.

5. The direct measurement device for the temperature in the circulating fluidized bed boiler furnace according to claim 1, characterized in that: It also includes a junction box, which is located outside the circulating fluidized bed boiler. The optical fiber is connected to the optical fiber extension line in the junction box to connect to the data transmission system and transmit the data to the analysis and recording system.

6. The device for directly measuring the temperature in a circulating fluidized bed boiler furnace according to any one of claims 1 to 5, characterized in that: The support assembly comprises: A connecting rod, one end of which is used to connect with the anti-wear grille; A hanging ring is connected to the other end of the connecting rod, and the optical fiber passes through the inner cavity of the hanging ring and is supported on the hanging ring.

7. The direct measurement device for the temperature in the circulating fluidized bed boiler furnace according to claim 6, characterized in that: The inner diameter of the hanging ring is larger than the outer diameter of the optical fiber; And / or, the outer wall of the optical fiber is provided with a protective cover; And / or, the material of the connecting rod is the same as that of the anti-wear grille and is fixed by welding; And / or, further comprising a heat insulating coating, wherein the heat insulating coating is located on a side of the anti-wear grid close to the optical fiber.

8. The device for directly measuring the temperature in a circulating fluidized bed boiler furnace according to any one of claims 1 to 5, characterized in that: The lead assembly comprises: A fixed tube, wherein the fixed tube is fixed to a furnace wall of a circulating fluidized bed boiler, one end of the fixed tube extends into the furnace of the circulating fluidized bed boiler, and the other end of the fixed tube extends outside the furnace of the circulating fluidized bed boiler, and the optical fiber passes through an inner cavity of the fixed tube; A heat-insulating component, the heat-insulating component is filled between the fixing tube and the optical fiber; A sealing member is arranged at the end of the fixed pipe.

9. The device for directly measuring the temperature in a circulating fluidized bed boiler furnace according to claim 8, characterized in that: The fixed pipe is fixedly connected to the water-cooled wall of the circulating fluidized bed boiler, a through hole is opened on the water-cooled wall, and one end of the fixed pipe is connected to the furnace of the circulating fluidized bed boiler through the through hole; And / or, the fixed tube is made of the same material as the water-cooled wall of the circulating fluidized bed boiler, and the fixed tube and the water-cooled wall are fixed by welding.

10. A method for directly measuring the temperature in a furnace of a circulating fluidized bed boiler based on the device for directly measuring the temperature in a furnace of any one of claims 1 to 9, characterized in that: include: Arranging at least one optical fiber in a circulating fluidized bed boiler furnace, wherein the optical fiber has a plurality of temperature measurement points; The optical fiber is connected to the anti-wear grid, at least part of the optical fiber is arranged along the circumference of the circulating fluidized bed boiler and is located below the anti-wear grid, and a plurality of the temperature measuring points are distributed at intervals in at least part of the furnace wall of the circulating fluidized bed boiler; Passing the optical fiber through the furnace wall of the circulating fluidized bed boiler to lead out the optical fiber, and connecting the optical fiber to a data transmission system; The temperature parameters of the plurality of temperature measuring points are obtained to reflect the temperature of the temperature field in the furnace.

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