JP2024155171A - Clinker fall detection device and clinker fall detection system - Google Patents

Abstract

[Problem] To provide a clinker drop detection device capable of quickly detecting the drop of clinker to the bottom of a furnace. [Solution] The clinker drop detection device includes a vibration data acquisition unit configured to acquire vibration data indicating a physical quantity related to the vibration of the lower part from a sensor that detects a physical quantity related to the vibration of the lower part of a boiler furnace, and a clinker drop detection unit configured to detect the drop of clinker to the bottom of the furnace based on the vibration data acquired by the vibration data acquisition unit. [Selected Figure] Figure 1

Description

This disclosure relates to a clinker fall detection device and a clinker fall detection system.

For example, as described in Patent Document 1, in the furnace of a coal-fired boiler, the combustion ash produced by the combustion of coal can adhere to stagnant areas of the combustion air, forming clinker, which is a large mass of combustion ash.

JP 2010-271001 A

The above clinker may fall to the bottom of the furnace inside the boiler due to its own weight or the effect of the ash removal device (soot blower). It is difficult to control the size of the falling clinker, so on rare occasions when large clinker falls, it may damage the equipment at the bottom of the furnace or the water cooling pipes of the furnace, and the plant may have to be shut down.

Considering this, possible measures include, for example, adding additives to the furnace that inhibit clinker growth, or removing the clinker with a soot blower before it grows large, but since it is difficult to completely prevent clinker from growing and falling, it is desirable to quickly detect the fall of clinker so that necessary measures can be taken when it does fall.

In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a clinker fall detection device capable of quickly detecting the fall of clinker to the bottom of a furnace, and a clinker fall detection system including the same.

In order to achieve the above object, a clinker fall detection device according to at least one embodiment of the present disclosure includes:
a vibration data acquisition unit configured to acquire vibration data indicating a physical quantity related to vibration of the lower part from a sensor that detects a physical quantity related to vibration of the lower part of the boiler furnace;
A clinker drop detection unit configured to detect the drop of clinker to a furnace bottom of the boiler based on the vibration data acquired by the vibration data acquisition unit;
Equipped with.

In order to achieve the above object, a clinker fall detection system according to at least one embodiment of the present disclosure includes:
The clinker drop detection device and the sensor are provided.

According to at least one embodiment of the present disclosure, a clinker fall detection device capable of quickly detecting the fall of clinker to the bottom of a furnace and a clinker fall detection system including the same are provided.

1 is a diagram showing a schematic configuration of a boiler 2 according to an embodiment of the present invention; FIG. 2 is a diagram showing an example of a cross section taken along line AA of the lower part of the furnace 4 in FIG. 2 is a schematic cross-sectional view showing an example of the arrangement of a sensor 20 for measuring the vibration acceleration level of a side wall 5 of a furnace 4. FIG. 2 is a diagram illustrating an example of a hardware configuration of a clinker fall detection device 22. FIG. 2 is a diagram for explaining an example of a functional configuration of a clinker fall detection device 22. FIG. FIG. 4 is a diagram showing an example of a clinker fall detection flow by the clinker fall detection device 22. FIG. 7 is a diagram for explaining the judgment of S13 in FIG. 6 in more detail, and shows an example of time series data of vibration acceleration levels La1, La2, La3 and La4 when the vibration acceleration levels of a predetermined frequency band in each of the vibration data acquired from the four sensors 20 are La1, La2, La3 and La4, respectively.

Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the invention.
For example, expressions expressing relative or absolute configuration, such as "in a certain direction,""along a certain direction,""parallel,""orthogonal,""center,""concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained.
For example, expressions indicating that things are in an equal state, such as "identical,""equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained.
For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained.
On the other hand, the expressions "comprise,""include,""have,""includes," or "have" of one element are not exclusive expressions excluding the presence of other elements.

FIG. 1 is a diagram illustrating a schematic configuration of a boiler 2 according to an embodiment.
1, the boiler 2 includes a furnace 4, a burner 12 provided on a side wall 5 of the furnace 4, a superheater 14 serving as a heat exchanger provided in an upper portion 4u of the furnace 4, a flue 16 connected to the upper portion 4u of the furnace 4, and a clinker fall detection system 18. The boiler 2 may be, for example, a coal-fired boiler that uses coal as fuel.

The furnace 4 includes a side wall 5 extending vertically, a furnace bottom 6 connected to the lower end of the side wall 5, and a ceiling wall 8 connected to the upper end of the side wall 5. The furnace bottom 6 is formed in a funnel shape, and an ash outlet 9 is formed at the lower end of the furnace bottom 6 for discharging combustion ash generated by the combustion of fuel. The ash outlet 9 may be formed in the center of the furnace bottom 6 in a plan view. The furnace bottom 6 extends in an inclined direction inclined with respect to both the vertical and horizontal directions so as to approach the ash outlet 9 as it moves downward from the lower end of the side wall 5. An ash processing device 10 is arranged below the ash outlet 9, into which ash that falls from the ash outlet 9 flows.

The burner 12 combusts fuel in the furnace 4 to generate combustion gas.
The superheater 14 includes a heat transfer tube 15 provided on the upper part of the furnace 4, and generates superheated steam by heating the steam flowing through the heat transfer tube 15 with the combustion gas generated in the furnace 4.
The flue 16 is configured to guide exhaust gas discharged from the furnace 4 (combustion gas generated in the furnace 4) to a chimney (not shown). The flue 16 is provided with a coal economizer (not shown) and the like.

The clinker drop detection system 18 includes a plurality of sensors 20 that detect physical quantities related to vibrations of the lower part 4d of the furnace 4, a camera 21 that captures video of the furnace bottom 6 of the furnace 4, and a clinker drop detection device 22 configured to detect the drop of clinker C to the furnace bottom 6 of the furnace 4 based on vibration data indicating physical quantities related to vibrations of the lower part 4d of the furnace 4 detected by the plurality of sensors 20. In the illustrated exemplary embodiment, the plurality of sensors 20 are fixed to the side wall 5 on the outside of the furnace 4 in the lower part 4d of the furnace 4. The lower part 4d of the furnace 4 means a part lower than the center of the furnace 4 in the height direction of the furnace 4, and the plurality of sensors 20 may be provided below the burner 12 in the lower part 4d of the furnace 4 from the viewpoint of accurately detecting the drop of clinker C to the furnace bottom 6 of the furnace 4.

FIG. 2 is a schematic diagram showing an example of a cross section taken along line AA of the lower portion 4d of the furnace 4 in FIG.
In the exemplary embodiment shown in Fig. 2, the furnace 4 has a square cross section, and the four side walls 5 of the furnace 4 include a front wall 5F, a rear wall 5B facing the front wall 5F, a right side wall 5R, and a left side wall 5L facing the right side wall 5R. Note that here, for the sake of convenience, the side wall 5 to which the above-mentioned flue 16 (see Fig. 1) of the furnace 4 is connected is referred to as the rear wall 5B, and the side wall 5 located on the right side when viewed from the front wall 5F to the rear wall 5B is referred to as the right side wall 5R.

In the exemplary embodiment shown in FIG. 2, the multiple sensors 20 include four sensors 20 fixed to the side walls 5 of the furnace 4 in the lower portion 4d of the furnace 4, and more specifically, two sensors 20 fixed to the right side wall 5R and two sensors 20 fixed to the left side wall 5L. Here, if a vertical plane that passes through the center of the ash discharge port 9 and is perpendicular to each of the right side wall 5R and the left side wall 5L is defined as a vertical plane V, the two sensors 20 provided on the right side wall 5R are arranged so as to sandwich the vertical plane V. That is, one of the two sensors 20 provided on the right side wall 5R is arranged on one side (front side) of the vertical plane V, and the other of the two sensors 20 provided on the right side wall 5R is arranged on the other side (rear side) of the vertical plane V. Also, the two sensors 20 provided on the left side wall 5L are arranged so as to sandwich the vertical plane V. That is, one of the two sensors 20 provided on the left side wall 5L is disposed on one side (front side) of the vertical plane V, and the other of the two sensors 20 provided on the left side wall 5L is disposed on the other side (rear side) of the vertical plane V.

Each of the multiple sensors 20 detects a physical quantity related to the vibration of the lower part 4d of the furnace 4 (e.g., a physical quantity that can quantitatively characterize the degree of vibration, such as the displacement of the side wall 5 when the lower part 4d of the furnace 4 vibrates, the vibration velocity, or the vibration acceleration). For this purpose, each of the multiple sensors 20 may be, for example, an AE sensor, an acceleration sensor, or a laser vibration sensor. Below, an example will be described in which each of the multiple sensors 20 is a vibration acceleration sensor that measures the vibration acceleration level of the lower part 4d of the furnace 4 (more specifically, the vibration acceleration level of the side wall 5 at the lower part 4d) as a physical quantity related to the vibration of the furnace bottom 6.

FIG. 3 is a schematic cross-sectional view showing an example of the arrangement of the sensors 20 for measuring the vibration acceleration level of the lower portion 4d of the furnace 4. As shown in FIG.
In the exemplary embodiment shown in Fig. 3, the side wall 5 of the furnace 4 includes alternatingly arranged furnace wall tubes 24 and fins 26, a heat insulating material 28 that covers the surfaces of the furnace wall tubes 24 and the fins 26 facing the outside of the furnace 4, and an exterior plate 30 that covers the surface of the heat insulating material 28 facing the outside of the furnace 4. In addition, one end of a waveguide rod 32 that penetrates the heat insulating material 28 and the exterior plate 30 in their thickness direction is fixed to the fin 26, and the sensor 20 arranged on the outside of the side wall 5 (outside the furnace 4) is fixed to the other end of the waveguide rod 32. In this way, by arranging each of the sensors 20 outside the furnace 4, it is possible to suppress damage to each of the sensors 20 due to the high temperature inside the furnace 4.

Figure 4 is a diagram showing an example of the hardware configuration of the clinker fall detection device 22. Figure 5 is a diagram for explaining an example of the functional configuration of the clinker fall detection device 22. Figure 6 is a diagram showing an example of the clinker fall detection flow by the clinker fall detection device 22.

4, the clinker drop detection device 22 includes, for example, a processor 72, a RAM (Random Access Memory) 74, a ROM (Read Only Memory) 76, a HDD (Hard Disk Drive) 78, an input I/F 80, and an output I/F 82, and is configured using a computer connected to each other via a bus 84. The hardware configuration of the clinker drop detection device 22 is not limited to the above, and may be configured by a combination of a control circuit and a storage device. The clinker drop detection device 22 is also configured by a computer executing a program that realizes each function of the clinker drop detection device 22. The functions of each part in the clinker drop detection device 22 described below are realized, for example, by loading a program stored in the ROM 76 into the RAM 74 and executing it with the processor 72, and by reading and writing data in the RAM 74 and the ROM 76. The hardware that constitutes the clinker drop detection device 22 may be concentrated in one location, or may be distributed across multiple locations.

As shown in FIG. 5, the clinker fall detection device 22 includes a vibration data acquisition unit 36, a frequency analysis unit 38, a clinker fall detection unit 40, a notification information output unit 42, a clinker fall frequency storage unit 44, a temporary video storage unit 46, and an extracted video storage unit 48. Below, the functions of each unit of the clinker fall detection device 22 will be explained using FIG. 6 etc.

As shown in FIG. 6, in S11, the vibration data acquisition unit 36 acquires vibration data (time series data of vibration acceleration level) indicating the vibration acceleration level of the lower part 4d of the furnace 4 from each of the multiple sensors 20 (four sensors 20 in the above exemplary embodiment) as vibration data indicating a physical quantity related to the vibration of the lower part 4d of the furnace 4.

In S12, the frequency analysis unit 38 performs frequency analysis (FFT analysis) on each of the vibration data acquired from the multiple sensors 20, and calculates the vibration acceleration level of a predetermined frequency band for each of the vibration data. Note that the "predetermined frequency band" here may be a frequency band that is somewhat higher than the frequency of stationary vibration of the lower part 4d of the furnace 4 accompanying the operation of the boiler 2 (the frequency of noisy noise (background noise) such as the combustion sound in the furnace 4 and the spray sound of the burner).

In S13, the clinker drop detection unit 40 determines whether the vibration acceleration levels calculated by the frequency analysis unit 38 for the above-mentioned predetermined frequency bands for each sensor 20 (for each vibration data) simultaneously exceed the threshold value, and if it is determined that the vibration acceleration levels calculated by the frequency analysis unit 38 for the above-mentioned predetermined frequency bands for each sensor 20 simultaneously exceed the threshold value, it detects the fall of clinker to the furnace bottom 6 of the furnace 4 (i.e., it determines that clinker has fallen to the furnace bottom 6 of the furnace 4). In S13, if the clinker drop detection unit 40 determines that the vibration acceleration levels calculated by the frequency analysis unit 38 for the above-mentioned predetermined frequency bands for each sensor 20 do not simultaneously exceed the threshold value, it determines that clinker has not fallen to the furnace bottom 6 of the furnace 4, and returns to S11.

In S13, if the clinker fall detection unit 40 detects the fall of clinker onto the furnace bottom 6 (if the vibration acceleration levels calculated by the frequency analysis unit 38 for the specified frequency bands for each sensor 20 simultaneously exceed the threshold value), in S14, the notification information output unit 42 outputs notification information to the notification device 50 to prompt the operator operating the boiler 2 to inspect the furnace bottom 6. For example, if the notification device 50 is a display device such as a display, the notification information output unit 42 outputs a signal to the notification device 50 to cause the notification device 50 to display the notification information, and the notification device 50 (display device) may display the notification information to prompt the operator to inspect the furnace bottom 6. Also, for example, if the notification device 50 is an alarm device or the like, the notification information output unit 42 outputs a signal to the notification device 50 to cause the notification device 50 to output the notification information as sound or the like, and the notification device 50 (alarm device or the like) may output the notification information as sound or the like to prompt inspection of the furnace bottom 6.

Figure 7 is a diagram for explaining the determination of S13 in Figure 6 in more detail, and shows an example of time series data for each of the vibration acceleration levels La1, La2, La3, and La4 when the vibration acceleration levels in the above-mentioned predetermined frequency bands in each of the vibration data acquired from the four sensors 20 are respectively La1, La2, La3, and La4.

In the example shown in FIG. 7, at time t1, the vibration acceleration levels La1, La2, La3 and La4 in the above-mentioned predetermined frequency band in each of the vibration data acquired from the four sensors 20 simultaneously exceed the threshold value La _th , so that the clinker fall detection unit 40 detects that clinker has fallen to the furnace bottom 6 at time t1, and the notification information output unit 42 outputs notification information to the notification device 50 to prompt the operator to inspect the furnace bottom 6.

In the example shown in Fig. 7, the vibration acceleration levels La1, La2, La3 and La4 simultaneously exceed the threshold value _Lath even during the period from time t2 to time t3, but this is due to the fact that a soot blower (not shown) for removing soot from inside the boiler 2 is operated from time t2 to time t3. For this reason, the clinker fall detection unit 40 may be configured not to detect the fall of clinker while the soot blower is operating, based on a control signal for controlling the soot blower.

The effects of the above-described clinker drop detection device 22 will now be described.
As shown in FIG. 1, when clinker C adhering to the inside of the furnace 4 (in the example shown in FIG. 1, the superheater 14 at the upper part of the furnace 4, the side wall 5 of the furnace 4, etc.) falls to the furnace bottom 6 of the furnace, a plurality of sensors 20 provided in the lower part 4d of the furnace 4 detect the vibration acceleration level of the vibration of the lower part 4d of the furnace 4, and the vibration data acquisition unit 36 acquires vibration data indicating the vibration acceleration level of the vibration of the lower part 4d of the furnace 4 from the plurality of sensors 20. Therefore, the clinker fall detection unit 40 can quickly detect the fall of clinker to the furnace bottom 6 of the furnace 4 based on the vibration data. As a result, the notification information output unit 42 outputs notification information to the notification device 50 to prompt the inspection of the furnace bottom 6 of the furnace 4, so that the operator who operates the boiler 2 can check the notification information of the notification device 50 and quickly take necessary measures.

In the above-described embodiment, the clinker fall detection unit 40 detects the fall of clinker to the furnace bottom 6 when the vibration acceleration levels of the above-mentioned predetermined frequency band in each of the vibration data acquired from the multiple sensors 20 simultaneously exceed the threshold value, so that the fall of clinker to the furnace bottom 6 can be detected with high accuracy. In addition, the vibration acceleration level of the vibration of the lower part 4d of the furnace 4 caused by the collision of clinker with the furnace bottom 6 has a frequency characteristic that takes a large value at a relatively high frequency compared to the steady vibration accompanying the operation of the boiler 2. Therefore, by taking into account the frequency characteristic, the above-mentioned predetermined frequency band is set to a frequency band relatively higher than the steady vibration accompanying the operation of the boiler 2 (a frequency band with a relatively large vibration acceleration level in the frequency distribution of the vibration acceleration level of the vibration of the lower part 4d of the furnace 4), so that the fall of clinker to the furnace bottom 6 can be detected with high accuracy.

In some embodiments, as shown in FIG. 5, the clinker drop detection device 22 may include a clinker drop frequency storage unit 44. The clinker drop frequency storage unit 44 stores the frequency at which the vibration acceleration level calculated for the predetermined frequency band for each sensor 20 by the frequency analysis unit 38 (i.e., the vibration acceleration level for the predetermined frequency band in each of the vibration data acquired from the multiple sensors 20) simultaneously exceeds the threshold value in association with the fuel properties of the boiler 2 (e.g., coal type, etc.). That is, the clinker drop frequency storage unit 44 stores the frequency of clinker dropping to the furnace bottom 6 in association with the fuel properties of the boiler. This makes it possible to grasp the relationship between the frequency of clinker dropping to the furnace bottom 6 and the fuel properties based on the frequency and fuel properties stored in the clinker drop frequency storage unit 44. This makes it possible to contribute to the construction of an operation pattern of the boiler 2 for each fuel property by considering the relationship between the frequency of clinker dropping to the furnace bottom 6 and the fuel properties.

In some embodiments, as shown in FIG. 5, the clinker fall detection device 22 may include a temporary video storage unit 46 and an extracted video storage unit 48.

The temporary video storage unit 46 temporarily stores video data acquired from the imaging device 21, which captures video of the furnace bottom 6 of the furnace 4.

Here, the timing (time t1 in the example shown in FIG. 7) at which the vibration acceleration levels calculated by the frequency analysis unit 38 for the specified frequency band for each sensor 20 (i.e., the vibration acceleration levels for the specified frequency band in each of the vibration data acquired from the multiple sensors 20) simultaneously exceed a threshold value is defined as the first timing. The extracted video storage unit 48 extracts and stores video data from the video data temporarily stored in the temporary video storage unit 46, from a specified time before the first timing (e.g., 10 seconds before) to a specified time after the first timing (e.g., 2 minutes after).

According to this configuration, by checking the video data stored in the extracted video storage unit 48, it is possible to check whether clinker has actually fallen onto the bottom 6 of the furnace 4 at the first timing. Therefore, it is possible to accurately detect the fall of clinker onto the bottom 6 of the furnace 4. In addition, by deleting the video data from the temporary video storage unit 46 after the storage of the video data in the extracted video storage unit 48 is completed, it is possible to prevent an increase in the volume of video data to be stored.

The present disclosure is not limited to the above-described embodiments, but also includes variations of the above-described embodiments and appropriate combinations of these embodiments.

For example, the above-mentioned multiple sensors 20 may be a sensor (tube leak detector) provided in the lower part 4d of the boiler 2 to detect steam leakage inside the boiler 2. In other words, the clinker fall detection device 22 may not only detect the fall of clinker to the furnace bottom 6, but also detect steam leakage inside the boiler 2 based on the vibration data acquired from each of the multiple sensors 20.

For example, in the above-described embodiment, the clinker fall detection device 22 compared the vibration acceleration level calculated for the above-mentioned specified frequency band by the frequency analysis unit 38 with a threshold value in order to improve the accuracy of detecting the fall of clinker, but the frequency analysis unit 38 is not essential, and the fall of clinker to the furnace bottom 6 of the furnace 4 may be detected when the vibration acceleration levels obtained from multiple sensors 20 simultaneously exceed the threshold value.

In addition, in the above-described embodiment, the multiple sensors 20 include four sensors 20 in order to increase the accuracy of detecting the fall of clinker, but the number of sensors 20 provided in the clinker fall detection system 18 may be, for example, one, or may be one or more.

The contents described in each of the above embodiments can be understood, for example, as follows:

(1) At least one embodiment of the clinker fall detection device according to the present disclosure (e.g., the above-described clinker fall detection device 22) includes:
a vibration data acquisition unit (e.g., the above-mentioned vibration data acquisition unit 36) configured to acquire vibration data indicating a physical quantity (e.g., the above-mentioned vibration acceleration level) related to the vibration of a lower part (e.g., the above-mentioned lower part 4d) of a furnace (e.g., the above-mentioned furnace 4) of a boiler (e.g., the above-mentioned boiler 2) from a sensor (e.g., the above-mentioned sensor 20) that detects a physical quantity related to the vibration of the lower part;
A clinker drop detection unit (for example, the above-mentioned clinker drop detection unit 40) configured to detect the drop of clinker to the bottom of the furnace based on the vibration data acquired by the vibration data acquisition unit;
Equipped with.

According to the clinker drop detection device described in (1) above, when clinker adhering inside the furnace falls to the bottom of the furnace, the lower part of the furnace vibrates and the vibration data acquisition unit acquires vibration data indicating physical quantities related to the vibration, so that the clinker drop detection unit can quickly detect the fall of clinker to the bottom of the furnace based on the vibration data. This makes it possible to prompt an inspection of the bottom of the boiler furnace, for example, and take necessary measures quickly.

(2) In some embodiments, in the clinker fall detection device described in (1) above,
The device further includes an alarm information output unit (e.g., the above-mentioned alarm information output unit 42) configured to output alarm information to prompt inspection of the bottom of the furnace when the clinker fall detection unit detects that clinker has fallen to the bottom of the furnace.

According to the clinker fall detection device described in (2) above, by outputting alarm information to prompt an inspection of the bottom of the furnace, if clinker falls to the bottom of the furnace, the operator can inspect the bottom of the furnace based on the alarm information, making it possible to take necessary measures promptly.

(3) In some embodiments, in the clinker fall detection device described in (1) or (2) above,
The clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when a physical quantity indicated by the vibration data acquired by the vibration data acquisition unit exceeds a threshold value.

According to the clinker fall detection device described in (3) above, by appropriately setting the threshold value, it is possible to accurately detect the fall of clinker to the bottom of the boiler furnace. For example, by setting the threshold value assuming the vibration that would occur if a clinker of a size that could cause damage to the bottom of the furnace falls, it is possible to detect the fall of clinker only when there is a possibility that the bottom of the furnace will be damaged.

(4) In some embodiments, in the clinker fall detection device according to any one of (1) to (3) above,
The vibration data acquisition unit is configured to acquire vibration data indicating a physical quantity related to the vibration of the lower part from a plurality of sensors that detect a physical quantity related to the vibration of the lower part of the furnace,
The clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when the physical quantities indicated by each of the vibration data acquired from the multiple sensors simultaneously exceed a threshold value.

According to the clinker fall detection device described in (4) above, the fall of clinker to the bottom of the boiler furnace is detected when the physical quantities indicated by the vibration data acquired from the multiple sensors simultaneously exceed the threshold value, so that the fall of clinker to the bottom of the furnace can be detected with high accuracy. In addition, by setting the threshold value assuming the vibration that would occur if clinker of a size that could potentially damage the bottom of the furnace were to fall, for example, the fall of clinker can be detected only when there is a possibility that damage will occur to the bottom of the furnace.

(5) In some embodiments, in the clinker fall detection device according to any one of (1) to (3) above,
A frequency analysis unit (e.g., the above-mentioned frequency analysis unit 38) performs frequency analysis on the vibration data acquired from the sensor and calculates a vibration acceleration level of a predetermined frequency band in the vibration data,
The clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when the vibration acceleration level in the specified frequency band calculated by the frequency analysis unit exceeds a threshold value.

According to the clinker drop detection device described in (5) above, the vibration acceleration level of the vibration of the furnace bottom caused by the collision of clinker with the furnace bottom has frequency characteristics that are large at relatively high frequencies compared to the steady vibration associated with the operation of the boiler. Therefore, by taking into account the frequency characteristics, the above-mentioned specified frequency band is set to a frequency band relatively higher than the steady vibration associated with the operation of the boiler (a frequency band with a relatively large vibration acceleration level in the frequency distribution of the vibration acceleration level of the vibration of the furnace bottom), the drop of clinker to the furnace bottom can be detected with high accuracy.

(6) In some embodiments, in the clinker fall detection device according to any one of (1) to (5) above,
The vibration data acquisition unit is configured to acquire vibration data indicating a physical quantity related to vibration of the lower portion from a plurality of sensors that detect a physical quantity related to vibration of the lower portion of the furnace,
The clinker drop detection device includes a frequency analysis unit (e.g., the above-mentioned frequency analysis unit 38) that performs frequency analysis on each of the vibration data acquired from the plurality of sensors and calculates a vibration acceleration level of a predetermined frequency band in each of the vibration data acquired from the plurality of sensors;
The clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when the vibration acceleration levels in the specified frequency band in each of the vibration data calculated by the frequency analysis unit simultaneously exceed a threshold value.

According to the clinker drop detection device described in (6) above, when the vibration acceleration levels of a predetermined frequency band in each of the vibration data acquired from the multiple sensors simultaneously exceed a threshold value, the drop of clinker to the bottom of the furnace is detected, so that the drop of clinker to the bottom of the furnace can be detected with high accuracy. In addition, the vibration acceleration level of the vibration of the furnace bottom caused by the collision of clinker with the bottom of the furnace has a frequency characteristic that takes a large value at a relatively high frequency compared to the steady vibration associated with the operation of the boiler. Therefore, by taking into account the frequency characteristic, the above-mentioned predetermined frequency band is set to a frequency band relatively higher than the steady vibration associated with the operation of the boiler (a frequency band with a relatively large vibration acceleration level in the frequency distribution of the vibration acceleration level of the vibration of the lower part of the furnace), the drop of clinker to the bottom of the furnace can be detected with high accuracy.

(7) In some embodiments, in the clinker fall detection device according to any one of (6) above,
The system further includes a clinker fall frequency storage unit (e.g., the above-mentioned clinker fall frequency storage unit 44) that stores the frequency at which the vibration acceleration levels in the specified frequency bands in each of the vibration data calculated by the frequency analysis unit simultaneously exceed a threshold value in association with the properties of the fuel in the boiler.

According to the clinker fall detection device described in (7) above, the relationship between the frequency of clinker falling to the bottom of the furnace and the properties of the fuel can be grasped based on the frequency stored in the clinker fall frequency storage unit and the properties of the fuel.

(8) In some embodiments, in the clinker fall detection device described in (6) or (7) above,
A video temporary storage unit (for example, the above-mentioned video temporary storage unit 46) that temporarily stores video data acquired from a photographing device that photographs a video of the bottom part of the furnace;
an extracted moving image storage unit (e.g., the above-mentioned extracted moving image storage unit 48) that extracts and stores moving image data from a predetermined time before the first timing to a predetermined time after the first timing from the moving image data temporarily stored in the moving image temporary storage unit, where the timing at which the vibration acceleration levels in the predetermined frequency band in each of the vibration data calculated by the frequency analysis unit simultaneously exceed a threshold value is defined as a first timing;
It further comprises:

According to the clinker fall detection device described in (8) above, by checking the video data stored in the extracted video storage unit 48, it is possible to check whether clinker has actually fallen to the bottom of the furnace. This makes it possible to accurately detect the fall of clinker to the bottom of the furnace. In addition, by deleting the video data from the temporary video storage unit after the storage of the video data in the extracted video storage unit is completed, it is possible to prevent an increase in the volume of video data to be stored.

(9) At least one embodiment of the clinker fall detection system according to the present disclosure includes:
The clinker drop detection device according to any one of (1), (2), (3) and (5) above is provided, and the sensor is also provided.

According to the clinker fall detection system described in (9) above, since it is equipped with the clinker fall detection device described in (1), (2), (3) or (5) above, the clinker fall detection unit can quickly detect the fall of clinker to the bottom of the furnace.

(10) In some embodiments, in the clinker fall detection system described in (9) above,
The sensor is provided outside the furnace.

According to the clinker fall detection system described in (10) above, by placing the sensor outside the furnace, it is possible to prevent the sensor from being damaged due to high temperatures inside the furnace.

(11) A clinker fall detection system according to at least one embodiment of the present disclosure,
The clinker drop detection device according to (4), (6), (7) or (8) above is provided, and the plurality of sensors are also provided.

According to the clinker fall detection system described in (11) above, since it is equipped with the clinker fall detection device described in (4), (6), (7) or (8) above, the clinker fall detection unit can quickly detect the fall of clinker to the bottom of the furnace.

Reference Signs List 2 Boiler 4 Furnace 4d Lower part 4u Upper part 5 Side wall 5B Rear wall 5F Front wall 5L Left side wall 5R Right side wall 6 Furnace bottom part 8 Ceiling wall 9 Ash discharge port 10 Ash treatment device 12 Burner 14 Superheater 15 Heat transfer tube 16 Flue 18 Clinker fall detection system 20 Sensor 21 Photography device 22 Clinker fall detection device 24 Furnace wall tube 26 Fin 28 Thermal insulation material 30 Exterior plate 32 Waveguide rod 36 Vibration data acquisition unit 38 Frequency analysis unit 40 Clinker fall detection unit 42 Notification information output unit 44 Clinker fall frequency storage unit 46 Video temporary storage unit 48 Extracted video storage unit 50 Notification device 72 Processor 74 RAM
76 ROM
78 HDD
80 Input I/F
82 Output I/F
84 Bus

Claims (11)

a vibration data acquisition unit configured to acquire vibration data indicating a physical quantity related to vibration of the lower part from a sensor that detects a physical quantity related to vibration of the lower part of the boiler furnace;
A clinker drop detection unit configured to detect the drop of clinker to the bottom of the furnace based on the vibration data acquired by the vibration data acquisition unit;
A clinker fall detection device comprising: The clinker drop detection device according to claim 1, further comprising an alarm information output unit configured to output alarm information to prompt inspection of the bottom of the furnace when the clinker drop detection unit detects that clinker has fallen to the bottom of the furnace. The clinker fall detection device according to claim 1, wherein the clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when a physical quantity indicated by the vibration data acquired by the vibration data acquisition unit exceeds a threshold value. The vibration data acquisition unit is configured to acquire vibration data indicating a physical quantity related to vibration of the lower portion from a plurality of sensors that detect a physical quantity related to vibration of the lower portion of the furnace,
The clinker fall detection device according to claim 1, wherein the clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when the physical quantities indicated by each of the vibration data acquired from the plurality of sensors simultaneously exceed a threshold value. A frequency analysis unit performs a frequency analysis on the vibration data acquired from the sensor and calculates a vibration acceleration level of a predetermined frequency band in the vibration data,
The clinker fall detection device according to claim 1, wherein the clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when the vibration acceleration level in the specified frequency band calculated by the frequency analysis unit exceeds a threshold value. The vibration data acquisition unit is configured to acquire vibration data indicating a physical quantity related to the vibration of the lower part from a plurality of sensors that detect a physical quantity related to the vibration of the lower part of the furnace,
The clinker drop detection device further includes a frequency analysis unit that performs frequency analysis on each of the vibration data acquired from the plurality of sensors and calculates a vibration acceleration level of a predetermined frequency band in each of the vibration data acquired from the plurality of sensors;
The clinker fall detection device according to claim 1, wherein the clinker fall detection unit is configured to detect the fall of clinker to the bottom of the furnace when the vibration acceleration levels in the predetermined frequency band in each of the vibration data calculated by the frequency analysis unit simultaneously exceed a threshold value. The clinker fall detection device according to claim 6, further comprising a clinker fall frequency storage unit that stores the frequency at which the vibration acceleration levels in the specified frequency bands in each of the vibration data calculated by the frequency analysis unit simultaneously exceed a threshold value in association with the properties of the fuel in the boiler. A video temporary storage unit that temporarily stores video data acquired from a video capture device that captures a video of the bottom of the furnace;
an extracted moving image storage unit that extracts and stores moving image data from the moving image data temporarily stored in the moving image temporary storage unit, the moving image data being from a predetermined time before the first timing to a predetermined time after the first timing, where the timing at which the vibration acceleration levels in the predetermined frequency band in each of the vibration data calculated by the frequency analysis unit simultaneously exceed a threshold value is defined as a first timing;
The clinker drop detection device of claim 6, further comprising: A clinker fall detection system comprising the clinker fall detection device according to claim 1 and the sensor. The clinker fall detection system according to claim 9, wherein the sensor is provided outside the furnace. A clinker fall detection system comprising the clinker fall detection device according to claim 4 and the plurality of sensors.

Images