TW202142838A - Earthquake monitoring system for boiler, and earthquake monitoring device for boiler - Google Patents

Abstract

The present invention is an earthquake monitoring system for a boiler, the boiler comprising a furnace and a cage part that is disposed at the back of the furnace. The boiler has vibration detection sensors for detecting: the vibration of a furnace rear wall opposing the cage part of the boiler; and the vibration of a cage front wall opposing the furnace rear wall. The sensors are disposed on the furnace rear wall and on the cage front wall. The earthquake monitoring device analyzes the relative displacement amount in the three-dimensional direction between the furnace and the cage part on the basis of sensor data, and outputs the analysis results.

Description

Boiler seismic monitoring system and boiler seismic monitoring device

The present invention relates to an earthquake monitoring system and device for a boiler, and particularly relates to a technology for monitoring the influence of the shaking of a boiler equipped with a furnace and a cage at the rear of the furnace.

As a technology for monitoring the impact of an industrial plant when an earthquake occurs, Non-Patent Document 1 has disclosed a technology for applying a smart technology including a sensor to an industrial plant.

In addition, Patent Document 1 discloses a vibration monitoring system in which a structure is equipped with a three-axis acceleration sensor, and the measurement value of the three-axis acceleration sensor is collected through a wireless communication network to monitor the vibration of the structure. . [Prior Technical Literature] [Non-Patent Literature]

[Non-Patent Document 1] "INTEGRATED SMART SEISMIC RISKS MANAGEMENT" Proceedings of the ASME 2019 Pressure Vessels & Piping Conference PVP2019 July 14-19, 2019, San Antonio, Texas, USA [Patent Literature]

[Patent Document 1] Japanese Patent Application Publication No. 2019-100914

[The problem to be solved by the invention]

Fuel incineration boilers used in power plants are equipped with furnaces and cages, which are suspended and supported on steel beams through suspension rods. In addition, in order to prevent the stove and the cage from swinging when an earthquake occurs, the steel column and the stove and the steel column and the cage are connected through an anti-seismic belt.

The furnace is a box-shaped structure surrounded by a water wall formed by connecting the heat transfer tubes with boiler water to each other through a membrane rod, and the cage is installed in the box-shaped structure for alignment. Heat transfer tube group for flow heat transfer. Therefore, there will be a great difference between the mass per unit volume of the furnace (mass density) and the mass density of the cage. Specifically, the mass density of the stove is very small compared to the mass density of the cage.

Therefore, when an earthquake occurs, the furnace and the cage will vibrate with a natural period corresponding to their respective rigidity and mass. For example, there may be localization of the secondary side wall or nozzle provided between the furnace and the cage. Risk of damage due to stress. In particular, in the flow path direction of the combustion gas from the furnace, the position where the flow path direction of the exhaust smoke on the upstream end side of the secondary side wall changes from the vertical direction to the horizontal direction, or the downstream end of the secondary side wall The part on the side that changes from the horizontal direction to the vertical downward direction (the part where the flow path direction is changed) will cause stress concentration, and there will be tearing from the auxiliary side wall to the furnace or from the auxiliary side wall to the cage. "Boiler-specific "Injury" is the so-called "strand split" phenomenon.

If the boiler is damaged, it will cause the power plant to stop operating and thus stop the power supply to the power system. Therefore, in order to prevent the power plant from stopping at an unexpected timing, and to recover as soon as possible in the event of a shutdown, it is desirable to predict The demand for the occurrence of "strand crack", which is unique to boiler damage. In order to predict this occurrence, it is necessary to monitor the earthquake in consideration of the inherent structure of the boiler.

However, what is disclosed in Non-Patent Document 1 and Patent Document 1 is only a general technique for vibration monitoring of industrial plants and power plants. Therefore, even if the techniques of Non-Patent Document 1 and Patent Document 1 are applied to boilers, the occurrence of "strand cracks" due to the unique structure of the furnace and cage may not be fully predicted.

The present invention was completed in view of such circumstances, and its purpose is to provide a technology that can detect with higher accuracy the behavior of a boiler with a furnace and a cage when an earthquake occurs, so as to achieve the occurrence of "strand crack" prediction. [Technical means to solve the problem]

In order to achieve the foregoing objective, the present invention has the composition described in the scope of the patent application. As an example, the present invention is an earthquake monitoring system for a boiler. The boiler is equipped with a stove and a cage at the rear of the aforementioned stove; it is characterized by: equipped with: a vibration detection sensor, in order to evaluate the facing of the aforementioned stove The relative displacement of the rear wall of the furnace of the cage part and the front wall of the cage facing the rear wall of the furnace to output sensor data; the seismic monitoring device analyzes the furnace based on the data of the sensor The relative displacement with the three-dimensional direction of the cage; and an output device that outputs the analysis result of the earthquake monitoring device; the vibration detection sensor is arranged on at least one of the rear wall of the furnace and the front wall of the cage. [Effects of the invention]

According to the present invention, it is possible to provide a technology capable of detecting the behavior of a boiler with a furnace and a cage at the time of an earthquake with higher accuracy, and achieving prediction of the occurrence of "strand cracks". In addition, the problems, constitution, and effects other than the foregoing are clarified by the following description of the embodiment.

Hereinafter, the boiler earthquake monitoring system and device according to the embodiment of the present invention will be described with reference to the drawings. For all the drawings, the same components are assigned the same symbols, and repeated descriptions are omitted.

<The first embodiment> Fig. 1 is a schematic configuration diagram of an earthquake monitoring system 100 for a boiler. The earthquake monitoring system 100 is constituted by a communication connection between a fuel-burning boiler 1 installed in a thermal power plant and a center 110 that monitors the behavior of the boiler 1 via a network 105.

Boiler 1, is equipped with: at least one vibration detection sensor (SHM sensor: Structural Health Monitoring) 101A1, 101A2, 101A3,..., 101An; data collection device 102, which collects and senses from vibration detection The sensor data output by the sensors 101A1, 101A2, 101A3, ..., 101An; and the first communication device 106, which transmits the sensor data to the center 110 via the network 105. The SHM sensor observes the physical quantities that represent the vibration of the structure on which the sensor is installed, and outputs sensor data that includes the vibration data representing the observation result. As specific examples of the SHM sensor, for example, a three-axis acceleration sensor, a gauge sensor, a distortion sensor, etc. can be used.

The center 110 is configured to include: a second communication device 107 that receives sensor data via a network 105; an earthquake monitoring device 103 that monitors the behavior of the boiler 1 based on the sensor data; and an output device 104 that outputs earthquakes The analysis result of the monitoring device 103. The output device 104 may be a display device that displays the analysis result on the screen, a terminal device, or a report generation device that outputs the analysis result in the form of a paper medium or a file, regardless of the output form.

The earthquake monitoring device 103 is configured to include, for example, a processor using a CPU, RAM, ROM, HDD, etc., and an earthquake monitoring program stored in a ROM or HDD. The CPU reads the earthquake monitoring program and loads it into RAM, and executes the earthquake monitoring program, thereby realizing the function of the earthquake monitoring program. ROM and HDD are an example of storage, and may also be EPROM, etc., regardless of the type of storage.

＜Integral structure of boiler 1＞ The overall structure of the boiler 1 will be described with reference to Figs. 2, 3, and 4. FIG. 2 is a perspective view showing an example of the structure of the boiler 1. FIG. 3 is a side view showing an example of the structure of the boiler 1. FIG. 4 is a plan view showing an example of the structure of the boiler 1.

The boiler 1 is mainly divided into three spaces: the furnace 2 is formed with a combustion space inside; the auxiliary side wall part 3 is formed in the flow path of the combustion gas generated in the furnace 2; and the cage part 4 is connected to Heat exchangers such as superheater, reheater, economizer, etc. are installed inside. The three spaces are arranged in the order of the furnace 2, the sub-side wall portion 3, and the cage portion 4 from the upstream side to the downstream side in the flow direction of the combustion gas.

Also, in the following description, the arrangement direction of the furnace 2, the sub-side wall portion 3, and the cage portion 4 is referred to as the "depth direction" (or the front-rear direction), and the furnace 2 side in the depth direction is referred to as the "front side" or " The "upstream side" is referred to as the "rear side" or "downstream side" on the side of the cage 4 on the opposite side. In addition, the direction orthogonal to the floor surface where the boiler 1 is installed is referred to as the "up and down direction". In addition, the direction orthogonal to the depth direction and the up-down direction is referred to as the "left-right direction".

The stove 2 is equipped with: a stove front wall 21, which is arranged on the front side and becomes the front surface of the stove 2; a stove rear wall 22, which is arranged opposite to the stove front wall 21 and becomes the back of the stove 2; and a pair of stove side walls 23, It is arranged between the front wall 21 of the stove and the back wall 22 of the stove to become the side of the stove 2;

The front wall 21 of the furnace and the rear wall 22 of the furnace are respectively provided with a plurality of burners 20 in the lower part that supply pulverized coal and air as fuel into the furnace 2. In the present embodiment, in the front wall 21 of the furnace and the rear wall 22 of the furnace, the burners 20 of 8 are respectively divided into two layers in the vertical direction, and 4 of them are arranged in each.

The pulverized coal supplied from each burner 20 is burned in the combustion space in the furnace 2, thereby generating combustion gas. The generated combustion gas flows from the lower side to the upper side of the furnace 2 in the ascending direction, and then flows down the cage 4 through the secondary side wall 3.

The sub-side wall part 3 is a flow path that connects the furnace 2 and the cage part 4 in the upper part in the depth direction. The secondary side wall part 3 is provided with: a pair of side walls 33 connected to a pair of furnace side walls 23 to become the side surfaces of the secondary side wall part 3; a top plate wall 34 connected to the furnace top wall 24 to become the top plate of the secondary side wall part 3; And the bottom wall 35 is arranged at the lower part of the pair of side walls 33 to become the bottom surface of the sub-side wall part 3.

The connecting portion between the upper end of the stove back wall 22 and the bottom wall 35 is formed with a nose portion 22a, which is formed by a recess formed by protruding the stove back wall 22 toward the combustion space side of the stove 2.

The cage 4 is provided with: a cage front wall 41, which is arranged opposite to the furnace rear wall 22 of the furnace 2 and becomes the front of the cage 4; the cage rear wall 42, which is arranged opposite to the cage front wall 41 and becomes a cage 4; a pair of cage side walls 43, which are arranged between the cage front wall 41 and the cage rear wall 42 to become the sides of the cage 4; and the cage top wall 44, which is connected to the top wall 34 of the auxiliary side wall 3 and It becomes the top plate of the cage 4.

As shown in FIG. 3, the furnace 2 is connected to a plurality of steel columns 12f arranged in front of the furnace 2 through a plurality of seismic belts 13f. In more detail, the back bracket 25f (hereinafter referred to as the "front back bracket") provided on the front wall 21 of the furnace and the steel column 12f are connected by the seismic belt 13f.

In addition, the cage 4 is connected to a plurality of steel columns 12b provided at the rear of the cage 4 through a plurality of seismic belts 13b. In more detail, the back bracket 25b (hereinafter referred to as the "rear side back bracket") provided on the cage rear wall 42 and the steel column 12b are connected by an earthquake-resistant belt 13b.

In the boiler 1, the walls constituting the furnace 2, the auxiliary side wall portion 3, and the cage portion 4 are alternately joined by a heat transfer tube in which a fluid flows and a plate-shaped membrane rod extending in the direction in which the heat transfer tube extends The resulting plate-shaped film wall is formed.

As shown in the enlarged view of Fig. 3, the front side back bracket 25f made of H-shaped steel is installed on the rear wall 22 of the furnace. In addition, a rear side support 25b made of H-shaped steel is also installed on the front wall 41 of the cage.

When an earthquake occurs, the stress will be concentrated on the part where the flow direction of the combustion gas from the furnace 2 to the auxiliary side wall 3 and the cage 4 changes (indicated by "X" in Figures 2 and 3) and the nose 22a, which is easy Cause breakage.

Therefore, in this embodiment, the evaluation is performed based on the sensor data that detects the relative displacement between the rear wall 22 of the furnace and the front wall 41 of the cage with the vibration detection sensor. In this embodiment, a 3-axis acceleration sensor is used as the vibration detection sensor. In addition, the amplitudes of the acceleration waveforms in each of the XYZ directions detected by the 3-axis acceleration sensors installed on the side of the furnace rear wall 22 and the cage front wall 41 are converted into the amplitudes of the relative displacement waveforms, and the amplitudes are monitored. Whether it is in the safe area between the lower limit and the upper limit, or is it in the damage area lower than the lower limit or higher than the upper limit. What's more, based on the relative displacement converted using the sensor data from the 3-axis acceleration sensor on the back wall 22 of the stove and the sensor data from the 3-axis acceleration sensor on the front wall 41 of the cage, the stove 2 is estimated And the distortion of the cage 4. This speculation is helpful to predict the occurrence of strand cracks. In addition, the 3-axis acceleration sensor itself cannot detect the relative displacement only by detecting the respective motions of the rear wall 22 of the furnace and the front wall 41 of the cage. However, because the rear wall 22 and the front wall 41 of the cage are respectively arranged The 3-axis acceleration sensor converts the acceleration waveform into a relative displacement waveform and can detect the relative displacement.

Therefore, in this embodiment, three 3-axis acceleration sensors 101A1, 101A2, 101A3 are installed in the left-right direction of the side back bracket 25f before the height position L1 (the height where the nose 22a is located). Similarly, three 3-axis acceleration sensors 101A4, 101A5, 101A6 are provided facing the 3-axis acceleration sensors 101A1, 101A2, and 101A3 along the left-right direction of the side back support 25b located behind the height position L1. At the height position L1, there are three pairs of three-axis acceleration sensor groups 101A1 and 101A4, 101A2 and 101A5, 101A3 and 101A6 arranged in opposite directions.

In addition, three pairs of three-axis acceleration sensor groups are also respectively arranged at the front side back bracket 25f and the rear side back bracket 25b at a height position L2 located below the height position L1. Based on the above, a total of 12 3-axis acceleration sensors of 6 pairs in 3 rows in the left-right direction and 2 layers in the up-down direction are arranged in the boiler 1 system.

Furthermore, the front side back bracket 25f and the rear side back bracket 25b may also be respectively arranged with three pairs of three-axis acceleration sensor groups at a height position L3 located below the height position L2. In this case, 18 triaxial acceleration sensors in total of 9 pairs in 3 rows in the left-right direction and 3 layers in the up-down direction are arranged in the boiler 1 system.

Fig. 5 is a flowchart showing the flow of seismic monitoring processing in the first embodiment. When the boiler 1 is in operation, the earthquake monitoring system 100 is activated. When the earthquake monitoring system 100 is activated, each 3-axis acceleration sensor system outputs sensor data. The earthquake monitoring device 103 obtains sensor data through the network 105 (S101).

Next, the seismic monitoring device 103 monitors the relative displacement of the rear wall 22 of the furnace and the front wall 41 of the cage.

Specifically, the earthquake monitoring device 103 calculates the difference of each component waveform in the X direction, the Y direction, and the Z direction of the sensor data output from each of the three-axis acceleration sensors arranged in the opposite direction (S102).

The seismic monitoring device 103 analyzes the relative displacement of the furnace 2 and the cage 4 from the difference of the waveforms of each component (S103). Examples of relative displacement are described later.

The earthquake monitoring device 103 monitors whether the amplitude of the relative displacement analyzed by the foregoing is between the lower limit allowable value and the upper limit allowable value (within the allowable range) (S104). Here, in the case of exceeding the allowable range, an alarm may be output.

The earthquake monitoring device 103 outputs the analysis result of the relative displacement between the furnace and the cage to the output device 104 (S105). When the earthquake monitoring process is about to end (S106: YES), the process ends. In the case where the seismic monitoring process is to be continued (S106: NO), the process returns to step S101.

With reference to FIGS. 6 to 8, an example of relative displacement will be described.

Fig. 6 is a diagram showing a state where the furnace 2 and the cage 4 are twisted and deformed in the left-right direction (twisted and deformed A). In this case, the stove 2 and the cage portion 4 hardly have relative displacement in the X direction and the Z direction. However, the relative displacement of the furnace 2 and the cage 4 in the Y direction is measured. That is, among the difference of the component waveforms in each direction obtained in step S103, the amplitude of the component waveform in the Y direction is measured, and the amplitude of the component waveform in the X direction and the Z direction is hardly measured.

FIG. 7 shows a state in which the space between the left and right directions of the furnace 2 and the cage 4 has been twisted and deformed (twisted deformation B) that expands from right to left. In this case, the stove 2 and the cage 4 will not have relative displacement in the Y direction and the Z direction. However, although the relative displacement in the X direction is not measured on the right side, the more to the left, the greater the relative displacement in the X direction. That is, the amplitude measured as the difference of the component waveforms in the X direction spreads from right to left.

FIG. 8 shows a state in which the space between the left and right directions of the furnace 2 and the cage 4 has been twisted and deformed (twisted deformation C). In this case, the stove 2 and the cage 4 will not have relative displacement in the Y direction and the Z direction. However, although the relative displacement in the X direction is not measured on the left side, the more to the right, the greater the relative displacement in the X direction. That is, the amplitude measured as the difference of the component waveforms in the X direction spreads from left to right.

According to this embodiment, a vibration detection sensor is installed on the opposite surface of the furnace 2 and the cage 4, and the detected sensor data is converted into a relative displacement amount and output to the earthquake monitoring device 103. The seismic monitoring device 103 determines whether the relative displacement exceeds the allowable value of damage.

In addition, since the vibration detection sensor is equipped with multiple layers in the up and down direction and multiple rows in the left and right direction, the relative displacement of the furnace 2 and the cage 4 can be measured for the relative displacement of the facing surface. By this, it is possible to determine how the furnace 2 and the cage 4 move in what cycle and direction, and it is easy to estimate whether the furnace 2 and the cage 4 are damaged.

In particular, by measuring the relative displacement of the height positions L1 and L2 near the nose portion 22a and the combustion gas flow path direction change location X, the stove 2 can be measured in consideration of the elastic deformation in the height direction of the stove 2 and the cage 4 And the relative displacement of the cage 4.

In addition, three relative displacement detection sensors are installed along the left and right directions on the front back bracket 25f and the rear back bracket 25b, so that it is easy to measure the left and right twists of the furnace 2 and the cage 4, that is, It is easy to measure when any one of the left and right end parts and the center part is deformed.

In particular, a three-axis acceleration sensor is used as a vibration detection sensor to detect the vibrations in the X, Y, and Z directions at each point on the facing surface of the furnace 2 and the cage 4 to analyze it, thereby enabling The amount of movement in each of the X direction, Y direction, and Z direction of the furnace 2 and the cage 4 is measured, and it is possible to estimate what kind of distortion occurs. According to the results of this estimation, if the distortion and deformation that are prone to damage occur, it is possible to prepare for repair as soon as possible, and it is expected that the shutdown time caused by the damage of the boiler 1 can be shortened, and even the time for the system to stop power transmission can be shortened. Effect.

As the vibration detection sensor, a contact type distance sensor or a non-contact type distance sensor may be used instead of the 3-axis acceleration sensor. As the contact-type distance sensor, for example, a wire-type displacement meter that electrically outputs the length of the expansion and contraction of a stainless steel wire may be used. In addition, a transformer displacement meter using a coil is used. In addition, it can also be used in a ruler type displacement meter with a ruler inside. In addition, it is also possible to use a ruler shooting system that uses a CMOS sensor to shoot absolute value glass rulers at high speed.

In addition, as examples of non-contact distance sensors, ultrasonic distance meters, LiDAR, and infrared sensors may also be used. In the case of using a distance sensor, it is also possible to arrange the stove 2 and the cage by arranging a plurality of distance sensors on the opposite surface of the furnace 2 and the cage 4, and measuring the relative displacement of the opposite surfaces. 4's motion speculation is even damage prediction.

Since the first embodiment only needs to be able to analyze the relative displacement, it can be realized even if one of the furnace rear wall 22 or the cage front wall 41 is equipped with a vibration detection sensor. In response to this, in the second embodiment described later, the form of monitoring the instantaneous value of the movement of the stove 2 and the instantaneous value of the movement of the cage 4 can be achieved by each of the stove back wall 22 or the cage front wall 41 having at least More than one vibration detection sensor to achieve. In addition, when combining the first embodiment and the second embodiment, and monitoring the instantaneous value of the amount of movement indicated by the sensor data of the vibration detection sensor used in the first embodiment, compare the furnace back wall 22 or the front of the cage The amount of movement indicated by the sensor data of the vibration detection sensor provided on any one of the walls 41 and the warning threshold described later may be sufficient.

<The second embodiment> In the second embodiment, a warning threshold is set in advance for the instantaneous value of the amount of movement (acceleration and displacement in this embodiment) indicated by the sensor data of the vibration detection sensors 101A1 to 101An, and a warning is issued if the value is greater than or equal to the warning threshold.的 IMPLEMENTATION FORM. The first embodiment is an embodiment that focuses on the relative displacement of the furnace 2 and the cage 4 to perform seismic monitoring. In contrast, this embodiment focuses on the instantaneous value of the amount of movement indicated by the sensor data rather than the relative displacement. It's different. The warning thresholds are respectively equivalent to the upper limit and the lower limit of the range (allowable range) that allows the instantaneous value of the exercise amount indicated by the sensor data to change. If it is within the allowable range, that is, the instantaneous value of the sensor data is greater than the lower limit of the allowable range and does not reach the upper limit, no warning will be issued.

In the following description, a three-axis acceleration sensor is used as the vibration detection sensor, and the instantaneous value of acceleration indicated by the sensor data and the instantaneous value of displacement calculated from the acceleration are the monitoring objects.

Alternatively, a meter sensor or a distance sensor can be used as the vibration detection sensor, and the instantaneous value of the displacement can be used as the monitoring object based on the sensor data. Alternatively, it is also possible to use a meter sensor or a distance sensor and calculate the acceleration based on the sensor data as the monitoring object.

In addition, only acceleration or only displacement may be the monitoring object.

Fig. 9 is a schematic configuration diagram of an earthquake monitoring system 100a of the boiler 1 according to the second embodiment. In addition, in the second embodiment, the network 105 is used to construct a cloud environment network. In addition, the vibration detection sensors 101A1, 101A2, 101A3,..., 101An provided in the boiler 1 and the center 110 are communicatively connected via a network 105.

The network 105 can also be communicatively connected with a mobile terminal device 104a carried by an operating operator of the boiler 1 and a console 104b installed in the control room of the thermal power plant installed in the boiler 1. In addition, the warning from the earthquake monitoring device 103 may be output to the mobile terminal device 104a and the console 104b in addition to the output device 104 of the center 110.

Hereinafter, the flow of the seismic monitoring processing of the second embodiment will be described with reference to FIG. 10. Fig. 10 is a flowchart showing the flow of seismic monitoring processing in the second embodiment.

The earthquake monitoring device 103 obtains a warning threshold for comparison with the instantaneous value of the amount of exercise indicated by the sensor data output by the vibration detection sensors 101A1 to 101An (S201). As shown in FIG. 9, the warning threshold for the case where acceleration is the monitoring target includes the acceleration warning threshold in the positive direction (the upper limit of the allowable range) and the acceleration warning threshold in the negative direction (the lower limit of the allowable range). In addition, the warning threshold for the case where displacement is the monitoring object includes a positive displacement warning threshold (upper limit of the allowable range) and a negative displacement warning threshold (lower limit of the allowable range). These warning thresholds may be set based on values obtained by structural analysis of the boiler 1 in advance, or may be set based on design values.

The earthquake monitoring device 103 obtains the sensor data of all the vibration detection sensors 101A1 to 101An through the network 105 (S202).

The seismic monitoring device 103, if the acceleration indicated by the sensor data from all the vibration detection sensors 101A1 to 101An is included in the allowable range, that is, if the acceleration warning threshold in the negative direction is greater than the positive direction If the acceleration warning threshold is exceeded, it is determined that the acceleration falls within the allowable range (S203: YES).

In addition, the seismic monitoring device 103, if the displacement indicated by the sensor data from all the vibration detection sensors 101A1 to 101An is included in the allowable range, that is, if the displacement warning threshold in the negative direction is greater than and does not reach If the displacement warning threshold is in the positive direction, it is judged that the displacement falls within the allowable range (S204: YES).

On the other hand, when the acceleration indicated by the sensor data from one or more of the vibration detection sensors 101A1 to 101An is greater than or equal to the acceleration warning threshold in the positive direction or less than the acceleration warning threshold in the negative direction (S203: NO), Or, when the displacement indicated by the sensor data from one or more vibration detection sensors 101A1 to 101An is greater than or equal to the displacement warning threshold in the positive direction or less than the displacement warning threshold in the negative direction (S204: NO), it is for The output device 104 outputs warning information (S205).

The output form of the warning information may be displayed on the screen of the output device 104. In addition, the warning information from the earthquake monitoring device 103 may be sent to the mobile terminal device 104a and the console 104b via the network 105. At this time, as the warning information, the URL of the report in which the sensor data (original data), etc. are recorded may be sent and uploaded.

Step S203 and step S204 may be in reverse order. In addition, the step S204 is skipped when only the acceleration is the monitoring target, and the step S203 is skipped when only the displacement is the monitoring target.

In the case where the seismic monitoring device 103 has acquired instantaneous values of all the sensor data within the allowable range (S204: YES) and the seismic monitoring process has not ended (S206: NO), the process returns to step S201. In the case where the earthquake monitoring process is about to end (S206: YES), the process ends.

According to this embodiment, by using the instantaneous value of the sensor data as the monitoring object, it is possible to monitor the motion state of each part of the furnace 2 and the cage 4 to predict or monitor the damage of the boiler 1.

For example, if the stove 2 and the cage 4 move in the same direction with almost the same acceleration or accompanied by displacement, it is difficult to determine how the stove 2 and the cage 4 move only by the amount of change in the relative displacement. However, in this embodiment, since the instantaneous value of each sensor data is compared with the warning threshold value, it is also possible to measure movement that is not easily expressed in relative displacement and issue a warning.

In addition, the present invention is not limited to the foregoing embodiments, and various modifications can be made without departing from the spirit of the present invention. Technical matters included in the technical ideas described in the scope of the patent application are all objects of the present invention. Although the foregoing embodiments represent suitable examples, those with ordinary knowledge in the technical field to which the invention pertains can implement various alternatives, modifications, modifications, or improvements from the content disclosed in this specification. Attached is the technical scope recorded in the scope of patent application.

In addition, the first embodiment and the second embodiment may be used in combination with one boiler 1.

1: boiler 2: stove 3: Sub-side wall part 4: Cage 12b, 12f: steel column 13b, 13f: seismic belt 20: Burner 21: The front wall of the stove 22: The back wall of the stove 22a: Nose 23: Stove sidewall 24: stove top wall 25b: Rear side support 25f: Front side back bracket 33: side wall 34: roof wall 35: bottom wall 41: The front wall of the cage 42: Cage Back Wall 43: Cage side wall 44: Cage ceiling wall 100, 100a: Earthquake monitoring system 101A1~101A6, 101An: 3-axis acceleration sensor (vibration detection sensor) 102: data collection device 103: Earthquake monitoring device 104: output device 104a: Mobile terminal device 104b: console 105: Network 106: The first communication device 107: 2nd communication device 110: Center

[Figure 1] A schematic configuration diagram of the boiler seismic monitoring system of the first embodiment. [Fig. 2] A perspective view showing an example of the structure of a boiler. Fig. 3 is a side view showing an example of the structure of the boiler. [Fig. 4] A plan view showing an example of the structure of a boiler. [Fig. 5] A flowchart showing the flow of seismic monitoring processing in the first embodiment. [Fig. 6] A diagram showing a state where the furnace and the cage are twisted and deformed in the left-right direction (twisted deformation A). [Fig. 7] A diagram showing a state in which the space between the left and right directions of the furnace and the cage portion has been twisted and deformed (twisted deformation B) extending from right to left. [Fig. 8] A diagram showing a state in which the space between the left and right directions of the furnace and the cage portion 4 has been twisted and deformed (twisted deformation C) that spreads from left to right. [Figure 9] A schematic configuration diagram of the boiler seismic monitoring system of the second embodiment. [Fig. 10] A flowchart showing the flow of seismic monitoring processing in the second embodiment.

1: boiler

100: Earthquake Monitoring System

101A1~101A6, 101An: 3-axis acceleration sensor (vibration detection sensor)

102: data collection device

103: Earthquake monitoring device

104: output device

105: Network

106: The first communication device

107: 2nd communication device

110: Center

Claims (12)

An earthquake monitoring system for a boiler, the boiler is equipped with a stove and a cage at the rear of the aforementioned stove; and is characterized by: having: The vibration detection sensor detects the vibration of the back wall of the stove facing the cage and the front wall of the cage facing the back wall of the stove, and outputs sensor data; The seismic monitoring device analyzes the relative displacement of the furnace and the cage in the three-dimensional direction based on the data of the sensor; and The output device is to output the analysis results of the aforementioned seismic monitoring device; The vibration detection sensor is arranged on at least one of the rear wall of the furnace and the front wall of the cage. The seismic monitoring system for boilers as described in claim 1, wherein: The back wall of the aforementioned furnace is constructed by arranging a plurality of heat transfer tubes arranged in an axial direction parallel to the vertical direction in the left-right direction, and is provided with a front back bracket that connects the plurality of heat transfer tubes and extends in the left-right direction. The front wall of the cage is constituted by arranging a plurality of heat transfer tubes arranged in an axial direction parallel to the vertical direction in the left-right direction, and is provided with a rear back bracket that connects the plurality of heat transfer tubes and extends in the left-right direction. In the aforementioned front back support, a plurality of vibration detection sensors are arranged along the extension direction of the front back support, In the aforementioned back support, a plurality of vibration detection sensors are arranged along the extension direction of the back support. The seismic monitoring system for boilers as described in claim 2, wherein: The back wall of the aforementioned stove is equipped with a plurality of layers of the aforementioned front back support at different height positions, The front wall of the aforementioned cage is equipped with multiple layers of the aforementioned rear back support at different height positions, On each layer of the front back support, a plurality of vibration detection sensors are arranged along the extending direction of the front back support, A plurality of vibration detection sensors are arranged along the extending direction of the rear back support on each layer of the aforementioned rear back support. The seismic monitoring system for boilers as described in claim 3, wherein: At least one layer of the plurality of front-side back brackets is attached to the upper part of the furnace, and is located near the height position where the combustion gas generated in the furnace changes from the ascending direction to the front-rear direction. The seismic monitoring system for boilers as described in claim 2, wherein: In the aforementioned front back support, at least three vibration detection sensors are arranged along the extension direction of the front back support, At least three vibration detection sensors are arranged along the extension direction of the rear back support in the aforementioned rear back support. The seismic monitoring system for boilers as described in claim 1, wherein: The vibration detection sensor is respectively arranged on the rear wall of the furnace and the front wall of the cage. One pair of three-axis acceleration sensors, or is arranged at the distance of at least one of the rear wall of the furnace and the front wall of the cage. Sensor. The seismic monitoring system for boilers as described in claim 3, wherein: The aforementioned earthquake monitoring device uses the sensor data of the aforementioned vibration detection sensors respectively installed on the front back support and the rear back support at the same height position to calculate the displacements in the X, Y, and Z directions, and calculate The difference in the X direction, which is the difference between the X-direction displacement on the front back support side and the X-direction displacement on the rear back support side, is the difference between the Y-direction displacement on the front back support side and the Y-direction displacement on the rear back support side. The difference in the Y-direction, the Z-direction difference as the difference between the Z-direction displacement on the front back support side and the Z-direction displacement on the rear back support side, is evaluated based on the aforementioned X-direction difference, the aforementioned Y-direction difference, and the aforementioned Z-direction difference The relative displacement of the stove and the aforementioned cage. The seismic monitoring system for boilers as described in claim 7, wherein: The aforementioned earthquake monitoring device analyzes whether the relative position of the stove and the cage is distorted in the left-right direction, the relative position of the stove and the cage is twisted and deformed in a way that expands from right to left, the stove and the aforementioned The relative position of the cage is twisted and deformed in a manner that expands from left to right. The seismic monitoring system for boilers as described in claim 1, wherein: The aforementioned earthquake monitoring device compares the instantaneous value of the respective movement amounts of the furnace and the aforementioned cage indicated by the aforementioned sensor data with the warning threshold value formed by the limit value of the allowable range that allows the fluctuation of the aforementioned instantaneous value, If the aforementioned instantaneous value is the same as the aforementioned warning threshold value or out of the aforementioned allowable range, a warning message is output to the aforementioned output device. The seismic monitoring system for boilers as described in claim 9, wherein: The aforementioned seismic monitoring device uses acceleration or displacement as the aforementioned instantaneous value. An earthquake monitoring system for a boiler, the boiler is equipped with a stove and a cage at the rear of the aforementioned stove; and is characterized by: having: The vibration detection sensor detects the vibration of the back wall of the stove facing the cage and the front wall of the cage facing the back wall of the stove, and outputs sensor data; The earthquake monitoring device analyzes the movement of the stove and the cage based on the data of the aforementioned sensor; and The output device is to output the analysis results of the aforementioned seismic monitoring device; The aforementioned vibration detection sensor is arranged at least one on the back wall of the furnace, and at least one is arranged on the front wall of the cage, The aforementioned earthquake monitoring device compares the instantaneous value of the respective movement amounts of the furnace and the aforementioned cage indicated by the aforementioned sensor data with the warning threshold value formed by the limit value of the allowable range that allows the fluctuation of the aforementioned instantaneous value, If the aforementioned instantaneous value is the same as the aforementioned warning threshold value or out of the aforementioned allowable range, a warning message is output to the aforementioned output device. An earthquake monitoring device for a boiler, the boiler system is equipped with a furnace and a cage is provided at the rear of the aforementioned furnace; and is characterized by: For at least one of the rear wall of the furnace facing the cage and the front wall of the cage facing the cage, the vibration of the rear wall of the furnace and the front wall of the cage is detected according to the The vibration data analyzes the relative displacement of the above-mentioned stove and the above-mentioned cage in the three-dimensional direction, and outputs the analysis result.

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