Flow state monitoring device and monitoring method for peak regulation circulating fluidized bed boiler

Abstract

The invention discloses a flow state monitoring device and monitoring method for a peak-shaving circulating fluidized bed boiler. The flow state monitoring device comprises a plurality of optical fiber temperature measurement assemblies and a signal processing unit. The plurality of optical fiber temperature measurement assemblies are arranged on the screen type heating surface at intervals along a first direction, and each optical fiber temperature measurement assembly comprises a plurality of temperature measurement points which are arranged at intervals along a fluidization direction; the signal processing unit is in communication connection with each optical fiber temperature measurement assembly so as to be suitable for receiving an optical signal fed back by each temperature measurement point in real time and obtaining corresponding temperature data according to the optical signal; the signal processing unit calculates and obtains flow state qualitative parameters according to the temperature data, and the flow state qualitative parameters are used for judging the fluidization state in the hearth. The temperature of the measuring point in the hearth is detected in real time through the optical fiber, and then the fluidization state in the hearth is monitored.

Description

Technical Field

[0001] This invention relates to the field of flow monitoring technology for circulating fluidized bed boilers, and in particular to a flow monitoring device and method for peak-shaving circulating fluidized bed boilers. Background Technology

[0002] For peak-shaving circulating fluidized bed boilers, accurately judging the changes in the flow regime inside the furnace is crucial for optimizing equipment operating parameters, improving energy utilization efficiency, and ensuring the safe and stable operation of the equipment during deep peak shaving.

[0003] Many related technologies measure the temperature at the top and bottom of the furnace, judging the flow regime changes based on the temperature difference between the two parts. A temperature difference greater than 50°C indicates poor fluidization, while a difference less than 50°C indicates good, uniform surface fluidization. However, this flow regime monitoring method lacks sensitivity and accuracy: the temperature difference reflects the average temperature difference across the entire furnace, and temperature changes caused by localized flow regime changes may be masked by the large-scale temperature average. This results in insufficient sensitivity of the temperature difference index to localized flow regime changes, making it impossible to effectively and accurately obtain comprehensive flow regime information within the furnace. Furthermore, flow regime changes within the furnace are a continuous and dynamic process, exhibiting different characteristics and influences at different time and spatial stages. This monitoring and judgment method struggles to capture the detailed and dynamic features of the flow regime changes.

[0004] In addition, the relevant technologies for measuring the temperature of the upper and lower parts of the furnace mainly include thermocouple temperature measurement, infrared radiation temperature measurement, and acoustic temperature measurement. Among them, thermocouple temperature measurement involves directly measuring the temperature by inserting a probe with a wear-resistant protective sleeve into the upper or lower part of the furnace. However, it has the following problems: 1. Long response time: thermal inertia causes temperature changes to take tens of seconds to stabilize, making it difficult to capture instantaneous fluctuations; 2. Large measurement error: due to the "cold wall effect" and fluidized particle erosion, the measured value is generally lower than the actual temperature, with an error of ±10–20℃; 3. Short lifespan: the lifespan of ordinary thermocouples is only 1–3 months, and the lifespan of wear-resistant thermocouples is about 3–6 months. Frequent replacement requires furnace shutdown, which increases maintenance costs. Infrared radiation thermometry captures the infrared radiation energy from the surface of materials inside the furnace for non-contact temperature measurement, offering a fast response time down to the millisecond level. However, it has several drawbacks: 1. It is highly susceptible to environmental interference; dust, water vapor, and cold wall radiation within the furnace significantly absorb or scatter the infrared signal, leading to lower measured values. For example, 960℃ flue gas may only be measured at 823℃, an error exceeding 15%. 2. It cannot cover the interior, only measuring the furnace surface temperature and failing to reflect the true temperature distribution in the central fluidized zone. Acoustic thermometry utilizes the relationship between the speed of sound propagation in gas and temperature, reconstructing the furnace temperature field through a multi-sensor layout. It offers a fast response and is unaffected by particulate matter. However, it also has several problems: 1. Accuracy is affected by noise; boiler operating noise easily interferes with the acoustic signal, requiring complex algorithms to filter background noise. 2. Installation is complex; the sensor layout must be precisely matched to the furnace structure, otherwise, significant errors in the calculation model will occur. Accurate temperature measurement is crucial for determining the fluidization state of peak-shaving circulating fluidized bed boilers, but current technologies cannot accurately measure the furnace temperature of such boilers. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a flow monitoring device and method for peak-shaving circulating fluidized bed boilers, aiming to solve the problem of difficulty in measuring the furnace temperature and determining changes in the flow state within the furnace.

[0006] This invention proposes a flow monitoring device for a peak-shaving circulating fluidized bed boiler. The flow monitoring device includes multiple fiber optic temperature sensing components and a signal processing unit. The multiple fiber optic temperature sensing components are spaced apart along a first direction on the screen-type heating surface of the peak-shaving circulating fluidized bed boiler. Each fiber optic temperature sensing component includes multiple temperature sensing points spaced apart along the fluidization direction. The signal processing unit is communicatively connected to each fiber optic temperature sensing component to receive the real-time optical signal feedback from each temperature sensing point and acquire the corresponding temperature data based on the optical signal. The signal processing unit is adapted to calculate and acquire qualitative flow parameters based on the temperature data. The qualitative flow parameters are used to determine the fluidization state in the furnace.

[0007] The flow monitoring device for peak-shaving circulating fluidized bed boilers according to the present invention uses optical fiber as a temperature measuring element, which has high temperature measurement accuracy, fast response speed, and is not affected by boiler noise, etc. The optical fiber temperature measuring component is set on the screen-type heating surface, which can cover the screen-type heating surface inside the furnace and realize the temperature measurement inside the furnace, thereby comprehensively monitoring the fluidization state inside the furnace.

[0008] According to some embodiments of the present invention, the fiber optic temperature measurement assembly includes a housing and a temperature-measuring fiber, wherein an installation channel is formed inside the housing; the temperature-measuring fiber is disposed in the installation channel and has multiple temperature measurement points.

[0009] According to some embodiments of the present invention, the screen-type heating surface includes multiple fins, and each fiber optic temperature sensing component is welded onto one fin.

[0010] According to some embodiments of the present invention, the distance between two adjacent temperature measuring points is L, and satisfies 50mm≤L≤150mm.

[0011] According to some embodiments of the present invention, the temperature measurement range of the temperature measuring point is 0℃~1200℃, and the temperature measurement accuracy of the temperature measuring point is less than or equal to 0.1℃.

[0012] According to some embodiments of the present invention, the top end of at least one fiber optic temperature sensing component extends to the top of the furnace chamber, and the bottom end of at least one fiber optic temperature sensing component extends to the bottom of the furnace chamber.

[0013] According to some embodiments of the present invention, at least one fiber optic temperature sensing component is disposed near the side wall of the furnace.

[0014] According to some embodiments of the present invention, the screen-type heating surface is constructed in multiple ways, and the multiple screen-type heating surfaces are spaced apart along the second direction; each screen-type heating surface is provided with multiple fiber optic temperature measuring components.

[0015] This invention also proposes a flow monitoring method for a peak-shaving circulating fluidized bed boiler, employing the aforementioned flow monitoring device for the peak-shaving circulating fluidized bed boiler. The flow monitoring method includes: Acquire temperature data at each temperature measurement point within the monitoring period; Calculate the rate of temperature change at each temperature measurement point based on the temperature data. The fluidization state at each temperature measurement point is determined based on the rate of temperature change. The overall fluidization state of the furnace is obtained by measuring the fluidization state at each temperature measurement point.

[0016] According to some embodiments of the present invention, the formula for calculating the temperature change rate is: N = |ΔT / Δt|; where N is the temperature change rate, Δt is the monitoring period, and ΔT is the temperature difference within the monitoring period; The steps for determining the fluidization state at each temperature measurement point based on the rate of temperature change specifically include: If N≤15, the fluidization state of the region where the temperature measuring point is located is in a steady state; If 15 < N ≤ 50, then the fluidization state of the region where the temperature measuring point is located is in a changing state; If 50 < N < 120, then the fluidization state of the region where the temperature measuring point is located is transient; If N≥120, the fluidization state of the area where the temperature measuring point is located is in an accident state.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the flow monitoring device for a peak-shaving circulating fluidized bed boiler according to some embodiments of the present invention; Figure 2 This is a structural view of a flow monitoring device according to some embodiments of the present invention along a second direction; Figure 3 This is a partial structural schematic diagram of a flow monitoring device according to some embodiments of the present invention; Figure 4 This is a schematic diagram of the structure of an optical fiber temperature measurement component according to some embodiments of the present invention.

[0019] Figure label: Peak-shaving circulating fluidized bed boiler 100; furnace 11; air chamber 12; air distribution plate 13; air cap 14; Screen-type heating surface 20; fins 21; Fiber optic temperature measurement component 30; housing 31; temperature measuring fiber 32; temperature measuring point 33. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The following is for reference. Figures 1-4 A flow monitoring device for a peak-shaving circulating fluidized bed boiler is described according to an embodiment of the present invention.

[0022] In related technologies, the furnace 11 of the peak-shaving circulating fluidized bed boiler 100 is provided with a screen-type heating surface 20, which includes multiple fins 21.

[0023] This invention proposes a flow monitoring device for a peak-shaving circulating fluidized bed boiler. The flow monitoring device includes multiple fiber optic temperature sensing components 30 and a signal processing unit. The multiple fiber optic temperature sensing components 30 are spaced apart along a first direction on the screen-type heating surface 20. Each fiber optic temperature sensing component 30 includes multiple temperature sensing points 33 spaced apart along the fluidization direction. The signal processing unit is communicatively connected to each fiber optic temperature sensing component 30 to receive the optical signal fed back in real time from each temperature sensing point 33 and obtain the corresponding temperature data based on the optical signal. The signal processing unit is adapted to calculate and obtain qualitative flow parameters based on the temperature data. The qualitative flow parameters are used to determine the fluidization state in the furnace 11.

[0024] According to the flow monitoring device for a peak-shaving circulating fluidized bed boiler of the present invention, by setting up an optical fiber temperature measuring component 30, real-time temperature measurement is achieved at the location of the measuring point 33, and further, flow information at the corresponding location is obtained based on the temperature change of each measuring point 33. The optical fiber temperature measuring component 30 is disposed on the screen-type heating surface 20, which is a key heating component disposed in the furnace 11 of the peak-shaving circulating fluidized bed boiler 100, providing an installation foundation for the optical fiber temperature measuring component 30, enabling each measuring point 33 to cover the internal area of ​​the furnace 11 of the peak-shaving circulating fluidized bed boiler, thereby realizing temperature monitoring inside the furnace 11. Furthermore, multiple measuring points 33 are spaced apart along the fluidization direction, i.e., as shown... Figure 1 The height of the furnace 11 shown allows for the acquisition of a complete temperature curve along the fluidization direction, visually reflecting the temperature variation differences at various measurement points in different regions along the fluidization direction, and monitoring the spatial dynamic evolution of the fluidization state. The signal processing unit receives the real-time optical signal feedback from each temperature measurement point 33, acquires the corresponding temperature data based on the optical signal, and calculates the qualitative parameters of the flow regime based on the temperature data. The qualitative parameters of the flow regime are the temperature change rate within a certain monitoring period, which can be used to determine the fluidization state at each temperature measurement point, thereby obtaining complete flow regime information in the furnace 11.

[0025] The flow monitoring device for peak-shaving circulating fluidized bed boilers according to the present invention uses optical fiber as a temperature measuring element, which has high temperature measurement accuracy, fast response speed, and is not affected by boiler noise, etc. It can monitor the temperature changes of multiple temperature monitoring points inside the furnace 11 in real time and continuously. By setting the optical fiber temperature measuring component 30 on the screen-type heating surface 20, the optical fiber temperature measuring component 30 can be deployed to the internal area of ​​the furnace 11 to realize the temperature measurement inside the furnace 11, and further acquire the temperature data of each temperature measuring point in each area in the fluidization direction, thereby comprehensively reflecting the fluidization state inside the furnace 11.

[0026] According to some embodiments of the present invention, the fiber optic temperature sensing assembly 30 includes a housing 31 and a temperature-sensing fiber 32, wherein a mounting channel is formed inside the housing 31; the temperature-sensing fiber 32 is disposed in the mounting channel, and the temperature-sensing fiber 32 has a plurality of temperature-sensing points 33. In this embodiment, as shown... Figure 4 As shown, the temperature-sensing optical fiber 32 is the main temperature-sensing structure, and the outer shell 31 can protect and fix the temperature-sensing optical fiber 32. In this embodiment, the outer shell 31 and the temperature-sensing optical fiber 32 form a temperature probe structure. In some embodiments, the outer shell 31 is made of heat-resistant stainless steel, which can withstand temperatures up to 1200℃, has high strength and is resistant to deformation, and can reduce the influence of the internal environment of the furnace 11 on the temperature-sensing optical fiber 32, providing effective protection for the temperature-sensing optical fiber 32 during temperature monitoring.

[0027] According to some embodiments of the present invention, the screen-type heating surface 20 includes a plurality of fins 21, and each fiber optic temperature sensing component 30 is welded to one fin 21. In this embodiment, welding the fiber optic temperature sensing component 30 to the fins 21 of the screen-type heating surface 20 can enable the fiber optic temperature sensing component 30 to maintain high stability during temperature monitoring, thereby ensuring the accuracy of the correlation between the temperature sensing point 33 and its spatial position and improving the accuracy of flow monitoring. Specifically, when the flow monitoring device is assembled into the furnace 11 of the peak-shaving circulating fluidized bed boiler 100, the heat-resistant shell 31 can be welded to the fins 21.

[0028] According to some embodiments of the present invention, the distance between two adjacent temperature measuring points 33 is L, and satisfies 50mm≤L≤150mm. In this embodiment, the distance between the temperature measuring points 33 is set to the above-mentioned range, which can achieve a monitoring density of 6-20 measuring points per meter along the fluidization direction, improve the spatial coverage of measuring points, thereby improving the spatial resolution of temperature measurement and more accurately reflecting the fluidization state.

[0029] According to some embodiments of the present invention, the temperature measurement range of the temperature measuring point 33 is 0℃ to 1200℃, and the temperature measurement accuracy of the temperature measuring point 33 is less than or equal to 0.1℃. In this embodiment, the temperature measuring performance of the temperature measuring point 33 is selected in such a way that it can cover the temperature change range within the furnace 11, ensuring the accuracy of temperature measurement, thereby accurately reflecting the flow state changes within the furnace 11.

[0030] According to some embodiments of the present invention, at least one fiber optic temperature sensing component 30 extends from its top end to the top of the furnace 11 and from its bottom end to the bottom of the furnace 11. In this embodiment, the partial extension of at least one fiber optic temperature sensing component 30 to the top of the furnace 11 and the partial extension of at least one fiber optic temperature sensing component 30 to the bottom of the furnace 11 allows for complete coverage of the internal region of the furnace 11 in the fluidization direction by the fiber optic temperature sensing component 30, enabling temperature monitoring of all regions in the fluidization direction and acquiring complete temperature field data, providing comprehensive and reliable data for monitoring the fluidization state within the furnace 11. Furthermore, the top end of each fiber optic temperature sensing component 30 extends to the top of the furnace, and the bottom end extends to the bottom of the furnace, thus covering the entire internal region of the furnace 11 in the fluidization direction. Even further, each fiber optic temperature sensing component 30 has a temperature sensing point at both its top and bottom ends to achieve temperature detection at the top and bottom of the furnace.

[0031] In some embodiments, the fiber optic temperature sensing component 30 is connected to the air distribution plate 13. Further, the air distribution plate 13 has mounting holes, through which a portion of the fiber optic temperature sensing component 30 extends into the air chamber 12 below the air distribution plate 13; and the outer shell 31 of the fiber optic temperature sensing component 30 is connected to the mounting holes to provide comprehensive protection for the temperature-sensing fiber optic cable 32 within the furnace 11. The bottom end of the fiber optic temperature sensing component 30 refers to the point where the outer shell 31 connects to the mounting holes. The mounting holes are located in the gaps between the air caps 14 or can be directly selected from the air cap mounting holes. Furthermore, the portion of the fiber optic temperature sensing component 30 extending into the air chamber 12 extends through the side wall of the air chamber 12 to the outside of the peak-shaving circulating fluidized bed boiler 100 to facilitate communication with the signal processing unit.

[0032] In some embodiments, to reduce the installation difficulty of the fiber optic temperature sensing assembly 30, each fiber optic temperature sensing assembly 30 consists of multiple temperature sensing units, which are arranged sequentially along the fluidization direction, extending from the lower part of the furnace 11 to the upper part of the furnace 11, so as to facilitate the placement of temperature sensing points 33 at intervals in the fluidization direction. Each temperature sensing unit includes a housing 31 and an internal temperature sensing fiber 32.

[0033] According to some embodiments of the present invention, at least one fiber optic temperature sensing component 30 is disposed near the side wall of the furnace 11. In the furnace 11 of a peak-shaving circulating fluidized bed boiler, the peripheral wall region exhibits significant boundary effects and is a high-incidence area for abnormal phenomena such as coking. The fiber optic temperature sensing component 30 of this embodiment, disposed near the side wall of the furnace 11, can monitor temperature changes at the side wall in real time, thereby achieving fluidization state monitoring at the furnace wall. This provides a more comprehensive reflection of flow regime changes within the furnace 11, captures boundary effects at the furnace wall, and monitors local abnormal phenomena, helping to prevent accidents and ensure the safe and stable operation of the boiler.

[0034] In some embodiments, such as Figure 1-3As shown, the screen-type heating surface 20 is installed on the side wall of the furnace 11 of the peak-shaving circulating fluidized bed boiler and extends to the central area of ​​the furnace 11. The screen-type heating surface 20 is covered with spaced fiber optic temperature measuring components 30 along the first direction, so that the temperature measuring array composed of fiber optic temperature measuring components 30 can monitor the temperature and fluidization state of the central area of ​​the furnace 11, as well as the temperature and fluidization state near the side wall of the furnace 11.

[0035] According to some embodiments of the present invention, in the furnace 11 of a peak-shaving circulating fluidized bed boiler, each fiber optic temperature sensing component 30 forms multiple basic monitoring sections and multiple dense monitoring sections, one of which is located near the furnace top and the other near the furnace bottom; and the density of temperature sensing points 33 in the dense monitoring sections is higher than that in the basic monitoring sections. In this embodiment, since the furnace bottom is near the air distribution plate 13, problems such as uneven fluidization and wear are prone to occur; the furnace top is near the outlet of the furnace 11, and problems such as sudden changes in particle concentration and flow rate are prone to occur. Increasing the distribution density of temperature sensing points 33 in these two areas can enhance the regional monitoring effect, achieve precise control of complex flow state changes in the furnace 11, and improve the accuracy of fluidization state monitoring in the furnace 11.

[0036] According to some embodiments of the present invention, multiple screen-type heating surfaces 20 are constructed, and the multiple screen-type heating surfaces 20 are spaced apart along a second direction; each screen-type heating surface 20 is provided with multiple fiber optic temperature measuring components 30. In this embodiment, the first direction refers to the width direction of the furnace 11 of the peak-shaving circulating fluidized bed boiler, and the second direction refers to the depth direction of the furnace 11 of the peak-shaving circulating fluidized bed boiler. By setting multiple screen-type heating surfaces 20 in the second direction, and spaced multiple fiber optic temperature measuring components 30 along the first direction on each screen-type heating surface 20, the temperature measuring point 33 can cover the three-dimensional space of the internal area of ​​the furnace 11, increasing the coverage of temperature monitoring, obtaining more comprehensive temperature information, reducing monitoring blind spots, and thus realizing the fluidization state monitoring of the entire internal area of ​​the furnace 11.

[0037] In some embodiments, at least one temperature measuring point 33 of each fiber optic temperature measuring component 30 is located on the same reference plane. In this embodiment, since one temperature measuring point 33 of all fiber optic temperature measuring components 30 is located on the same reference plane, a spatial coordinate system can be established through this reference plane. The relative positions of other temperature measuring points 33 in each fiber optic temperature measuring component 30 to the temperature measuring point on the reference plane can be determined by setting the spacing, thereby facilitating the positioning of each temperature measuring point 33 in the spatial coordinate system, thereby improving the efficiency of subsequent signal processing and analysis, helping to construct a high-precision temperature field model, and thus improving the accuracy of temperature monitoring in various regions inside the furnace 11 and the accuracy of fluidization state monitoring.

[0038] This invention also proposes a flow monitoring method for a peak-shaving circulating fluidized bed boiler, employing the aforementioned flow monitoring device for the peak-shaving circulating fluidized bed boiler. The flow monitoring method includes: S1. Obtain the temperature data at the corresponding location of each temperature measurement point 33 within the monitoring period; S2. Calculate the temperature change rate N at each temperature measurement point 33 based on the temperature data, N=|ΔT / Δt|; Where N is the rate of temperature change, in °C / min; ΔT is the temperature difference within the monitoring period, in °C; and Δt is the monitoring period, in min. S3. Determine the fluidization state at each temperature measurement point 33 based on the rate of temperature change: If N≤15, then the fluidization state of the area where the temperature measuring point 33 is located is in a steady state, that is, a stable load state, or a low-speed, stable load increase and decrease state. If 15 < N ≤ 50, then the fluidization state of the area where the temperature measuring point 33 is located is in a changing state, that is, a state of rapid load increase and decrease. If 50 < N < 120, then the fluidization state of the area where the temperature measuring point 33 is located is transient, that is, special states such as suppressed fire and ignition fire. If N≥120, then the fluidization state of the area where temperature measuring point 33 is located is in an accident state, that is, a combustion failure state such as coking and coal shortage, or an accident state. S4. Obtain complete flow information inside the furnace 11 based on the fluidization state at each temperature measurement point 33.

[0039] According to the flow monitoring method of the peak-shaving circulating fluidized bed boiler of the present invention, the temperature field distribution can be obtained through multi-point measurement results, the flow effect at the corresponding position can be judged by the ratio of the temperature change rate at different positions, and finally the overall fluidization state inside the furnace 11 can be obtained.

[0040] According to the flow monitoring device and flow monitoring method of the present invention, the present invention can realize the full-space, highly dynamic temperature sensing in the furnace through multi-dimensional data fusion, and then judge the flow state in the furnace through the furnace temperature, providing effective guidance for operators and improving the safety and stability of boiler operation.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0043] In the description of this invention, "a plurality of" means two or more.

[0044] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0045] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flow monitoring device for a peak-shaving circulating fluidized bed boiler, characterized in that, include: Multiple fiber optic temperature measuring components are arranged at intervals along a first direction on the screen-type heating surface of the peak-shaving circulating fluidized bed boiler. Each fiber optic temperature measuring component includes multiple temperature measuring points arranged at intervals along the fluidization direction. A signal processing unit is communicatively connected to each of the optical fiber temperature measurement components to receive optical signals fed back in real time from each of the temperature measurement points; the signal processing unit is adapted to acquire corresponding temperature data based on the optical signals and to calculate and acquire flow state qualitative parameters based on the temperature data, the flow state qualitative parameters being used to determine the fluidization state in the furnace.

2. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, The fiber optic temperature sensing component includes: The outer casing has mounting channels formed inside it; A temperature-sensing optical fiber is disposed in the mounting channel, and the temperature-sensing optical fiber forms the plurality of temperature-sensing points.

3. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, The screen-type heating surface includes multiple fins, and each of the fiber optic temperature sensing components is welded to one of the fins.

4. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, The distance between two adjacent temperature measuring points is L, and satisfies 50mm≤L≤150mm.

5. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, The temperature measurement range of the temperature measuring point is 0℃~1200℃, and the temperature measurement accuracy of the temperature measuring point is less than or equal to 0.1℃.

6. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, The top end of at least one of the fiber optic temperature sensing components extends to the top of the furnace chamber, and the bottom end of at least one of the fiber optic temperature sensing components extends to the bottom of the furnace chamber.

7. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, At least one of the fiber optic temperature sensing components is disposed near the side wall of the furnace.

8. The flow monitoring device for a peak-shaving circulating fluidized bed boiler according to claim 1, characterized in that, The screen-type heating surface is constructed in multiple ways, and the multiple screen-type heating surfaces are spaced apart along the second direction; each of the screen-type heating surfaces is provided with the multiple fiber optic temperature measuring components.

9. A method for monitoring the flow pattern of a peak-shaving circulating fluidized bed boiler, characterized in that, The flow monitoring device for a peak-shaving circulating fluidized bed boiler as described in any one of claims 1-8, wherein the flow monitoring method includes: Acquire temperature data at the location corresponding to each of the aforementioned temperature measurement points within the monitoring period; Calculate the rate of temperature change at each temperature measurement point based on the temperature data. The fluidization state at each temperature measurement point is determined based on the temperature change rate. The fluidization state of the furnace as a whole is obtained based on the fluidization state at the corresponding position of each temperature measuring point.

10. The flow regime monitoring method for a peak-shaving circulating fluidized bed boiler according to claim 9, characterized in that, The formula for calculating the rate of temperature change is: N = |ΔT / Δt|; where N is the rate of temperature change, Δt is the monitoring period, and ΔT is the temperature difference within the monitoring period. The step of determining the fluidization state at each temperature measurement point based on the temperature change rate specifically includes: If N≤15, then the fluidization state of the region where the temperature measuring point is located is in a steady state; If 15 < N ≤ 50, then the fluidization state of the region where the temperature measuring point is located is in a changing state; If 50 < N < 120, then the fluidization state of the region where the temperature measuring point is located is transient; If N≥120, then the fluidization state of the area where the temperature measuring point is located is in an accident state.

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