Fire suppression system

Abstract

To provide a fire extinguishing system that performs fire extinguishing in a facility that stores a deposition having an uneven upper surface, such as a storage facility of biomass power generation, for example.SOLUTION: Provided is a fire extinguishing system provided with a movable water discharge part in which a direction is controlled by detection, in a facility that stores a deposition having an uneven upper surface.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a fire extinguishing system that automatically sprays water toward a fire flame. [Background technology]

[0002] Biomass power generation uses waste wood and other materials that eventually turn into CO2 through biological decomposition, so compared to fossil fuels, final CO2 emissions do not increase, and it has been drawing attention as an effective energy source for reducing greenhouse gas emissions. The fuel for biomass power generation is wood pellets, and in the direct combustion method, wood pellets and other materials stored in a storage facility are transported to a boiler and burned to use the heat. However, if a large amount of combustible material is stored in a storage facility, there is a possibility that it will spontaneously combust due to temperature increases caused by oxidation reactions, etc. Furthermore, under the Fire Service Act, wood pellet storage facilities are classified as designated combustible storage facilities. For this reason, it is necessary to install water-discharging sprinkler systems, water spray systems, foam fire extinguishing systems, etc. Among these, water spray systems are often used.

[0003] However, in order to spray a large amount of water into the fire-prone area of ​​the storage facility, which is the protected area, a water spray system requires a water source that can store a large amount of water and a pump that can deliver a large amount of water. Furthermore, it is necessary to lay a lot of pipes on the high ceiling of the storage facility and install water spray heads for large flow rates, and it is necessary to set up temporary scaffolding, which requires a long construction period and high construction costs.

[0004] In contrast, a system that uses a movable water discharge head does not require the installation or installation of equipment or piping on high ceiling surfaces. In addition to the wood pellets and wood chips used in biomass power generation, large amounts of combustible materials are stored in coal storage facilities and garbage pits, etc., which can also spontaneously combust. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-097613 A Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 describes a movable water discharge head equipped with an infrared linear sensor, a flame detector, and a fire extinguishing nozzle. When extinguishing a fire, the infrared linear sensor rotates to detect the position of a heat source, the flame detector is directed toward the heat source to determine the fire source, and the extinguishing nozzle is aimed toward the fire source to discharge water. The extinguishing head is equipped with a long-throw head that discharges water far away, a medium-throw head that discharges water at a medium distance, and a close-throw head that discharges water close by, and discharges water from a close position to a far position at once toward the fire source. The movable water discharge head of Patent Document 1 is used in places with flat floors such as atriums and gymnasiums.

[0007] An object of the present invention is to provide a fire extinguishing system that extinguishes fires in facilities that store piles having uneven upper surfaces, such as storage facilities for biomass power generation, etc. [Means for solving the problem]

[0008] One embodiment of the present invention is a fire extinguishing system in which a storage facility where wood pellets are stored so that the top surface is uneven is provided with a movable water-discharge unit that controls direction by detection, and a protected area is provided with an infrared detection unit and a nozzle unit in which the water-discharge unit rotates, and when a fire signal is obtained, the infrared detection units of the multiple nozzle units are rotated to detect a flame and extinguish the fire by discharging water from the water-discharge unit, a flame detection operation is performed to detect the flame position from infrared information obtained by the infrared detection units of the multiple nozzle units, and a water-discharge start operation is performed to start discharging water from the water-discharge unit, with the nozzle unit among the multiple nozzle units that is closest to the flame position being used as the water-discharge unit, the storage facility is divided into a plurality of areas, and each area is provided with a differential distribution type heat detector with an air pipe running on the ceiling surface, a fire receiver that receives fire signals from the multiple heat detectors, and a central operation panel to which a report signal is sent when the fire receiver determines that a fire exists, and when a fire occurs, the central operation panel controls the opening of the open valve of the nozzle unit. Moreover, one embodiment of the present invention is a fire extinguishing system in which a movable water-discharging unit that controls direction by detection is provided in a facility for storing deposits having an uneven upper surface, an infrared detection unit and a nozzle unit in which the water-discharging unit rotates are provided in a protected area, and when a fire signal is obtained, a flame is detected by the infrared detection units of a plurality of the nozzle units and the fire is extinguished by discharging water from the water-discharging unit, the fire extinguishing system performs a flame detection operation to detect a flame position from infrared information obtained by the infrared detection units of the plurality of the nozzle units, performs a water-discharging start operation to start discharging water from the water-discharging unit using any one of the plurality of the nozzle units as a water-discharging unit, and after the water-discharging start operation, performs a water-discharging correction operation to feedback-control the water discharge of the water-discharging unit so that the water falls to the flame position based on infrared information obtained by the infrared detection units of the nozzle units other than the water-discharging unit. Effect of the Invention

[0009] According to the present invention, it is possible to provide a fire extinguishing system that discharges water in a facility that stores piles having an uneven upper surface. [Brief description of the drawings]

[0010] [Figure 1] Fire extinguishing system 2 installed at a wood pellet storage facility 3. [Diagram 2] The nozzle unit 21 of the first embodiment. [Diagram 3] FIG. 2 is a diagram showing a situation in which water is being sprayed from the nozzle unit 21 onto a fire flame 4. [Figure 4] System configuration of fire extinguishing system 2. [Diagram 5] Fire extinguishing flow chart. [Figure 6] 13 is an image taken by infrared camera 293d at a nozzle unit 21d other than the nozzle unit 21 that is discharging water. [Figure 7] Nozzle unit 29 of the second embodiment. [Figure 8] A diagram showing a situation where a flame 4 is generated in a valley of wood pellets 3. [Figure 9] 13 is a diagram showing a state in which wood pellets 3 are blown off by water discharged from a nozzle unit 29 in the third embodiment. FIG. [Figure 10] The interior of storage facility 1 as seen from infrared camera 293 of nozzle unit 29. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0011] FIG. 1 shows a fire extinguishing system 2 installed in a storage facility 1 for wood pellets 3. FIG. 1(A) shows the storage facility 1, which is a protected area, as viewed from above, and FIG. 1(B) shows a side view. The fire extinguishing system 2 comprises a plurality of nozzle units 21 and a plurality of heat detectors 22 as equipment within the storage facility 1. In the fire extinguishing system 2 of the first embodiment, the plurality of nozzle units 21 are installed at the same height, spaced apart from one another on the sides, in a high location on the wall surface 11 of the storage facility 1. The heat detectors 22 are Differential It is a distributed type, and Fig. 1 shows the part of the air pipe laid on the ceiling surface 12. As shown in Fig. 1(B), wood pellets 3 are piled up inside the storage facility 1. When the temperature inside the stored wood pellets 3 rises and flammable gas is generated, flames 4 appear on the upper surface of the wood pellets 3, causing a fire. Fig. 1 is divided into four areas, and a heat detector 22 is installed in each area to detect fires within the area.

[0012] FIG. 2 shows the nozzle unit 21 of the first embodiment. The nozzle unit 21 is provided with a movable deflector 212 at the tip of the nozzle 211, which is a water discharge part. In addition, an infrared camera 213, which is an infrared detection part, is provided below the nozzle 211, and a flame detection device 214, which is a flame detection part, is provided below that. The infrared camera 213 is used to obtain an infrared image or an infrared video, which is infrared information. The flame detection device 214 is used to confirm that the heat source captured by the infrared camera is a flame. And, below the nozzle 211, there is a horizontal rotation device 215 that rotates the nozzle 211 in a horizontal direction. Below the horizontal rotation device 215 is a base 216, which supports the whole. The base 216 of the first embodiment is a pipe through which water passes, and the water for discharge passes through the base 216, passes through the horizontal rotation device 215, and enters the nozzle 211. The tip of the nozzle 211 faces diagonally upward, and the infrared camera 213 and the flame detection device 214 face diagonally downward. The nozzle 211, the infrared camera 213, and the flame detection device 214 rotate together in the horizontal direction, are aligned in the same direction in the horizontal direction, and face the same direction when the nozzle unit 21 is viewed from above.

[0013] FIG. 3 is a diagram showing a state in which water is discharged from the nozzle unit 21 to the flame 4 of a fire. The water is discharged in a mountain-shaped water discharge trajectory 5. Therefore, the water falls on the location of the flame 4 from almost directly above the flame 4. The falling water spreads and penetrates into the pile of wood pellets 3, cooling the heat source from which the flammable gas is generated. The horizontal angle of the water discharge is adjusted by the horizontal rotation device 215, and the flight distance is adjusted by the action of the deflector 212 by moving the deflector 212. When the action of the deflector 212 is weakened, the water discharge becomes rod-shaped and falls far away, and when the action is strengthened, the water discharge is weakened and falls nearby. In the first embodiment, the action of the deflector 212 changes continuously, so the strength of the water discharge changes continuously.

[0014] FIG. 4 shows the system configuration of the fire extinguishing system 2. The nozzle units 21 are connected to a central operation panel 23 by a serial wiring 261. The central operation panel 23 is connected to a fire receiver 24 and a pump control panel 25. The fire receiver 24 receives fire signals from the heat detectors 22. The nozzle units 21 are connected to a local control panel 27 by a serial wiring 262. The local control panel 27 is connected to an open valve 28 and an operation unit (not shown). The open valve 28 has a valve for each nozzle unit 21, and can select one of the nozzle units 21 to supply water. The central operation panel 23, the fire receiver 24, and the pump control panel 25 are provided in the control room of the power plant, and the open valve 28 is provided near the storage facility 1. The open valve 28 may be controlled to open and close from the central operation panel 23 without providing the local control panel 27.

[0015] Fig. 5 is a flow diagram of fire extinguishing. The operation of fire extinguishing will be explained according to this flow diagram. When a fire occurs, the heat detector 22 is activated and transmits a fire signal to the fire receiver 24. When the fire receiver 24 judges that there is a fire, a communication signal is transmitted to the central operation panel 23 (step S1). The communication signal initiates the flame detection operation.

[0016] <Flame detection operation> A search instruction signal for searching for the flame 4 is sent from the central operation panel 23 to all the nozzle units 21 (step S2). Each nozzle unit 21 performs a search operation (step S3). In the search operation, when the nozzle 211 is rotated by the horizontal rotation device 215, the infrared camera 213 installed below the nozzle 211 also rotates. Then, the direction of the high temperature area in the protection area is searched for by the infrared image, which is infrared information, and the high temperature area with the highest temperature stops at a position that is the center of the infrared camera 213 in the left-right direction. At this time, the flame detection device 214, which is attached facing the same direction as the infrared camera 213, faces the high temperature area. Then, the flame detection device 214 performs a flame judgment by detecting the CO2 resonance radiation specific to a flame and the fluctuation of its intensity. If it is judged not to be a flame, the next high temperature area with the highest temperature is searched for and a flame judgment is performed.

[0017] If it is determined to be a flame, the horizontal angle at that time is obtained. Then, the obtained horizontal angle data and the infrared image of the infrared camera 213 are transmitted from all the nozzle units 21 to the central operation panel 23 (step S4).

[0018] The central operation panel 23 calculates the vertical angle from the infrared image of the infrared camera 213 sent from each nozzle unit 21, and obtains the received horizontal angle data and the flame direction vector from each nozzle unit 21. Then, for the multiple nozzle units 21, the flame position, which is the three-dimensional position of the flame 4, is calculated from the stored positions of each nozzle unit 21 and the flame direction vector (step S5).

[0019] <Water spray start operation> Next, the central operation panel 23 selects the nozzle unit 21 closest to the position of the flame 4 as the water-discharging unit. Then, horizontal distance data is calculated from the three-dimensional position of the flame 4 and the position of the water-discharging unit (step S6). Then, a water-discharging instruction signal and horizontal distance data are sent from the central operation panel 23 to the water-discharging unit that is the nozzle unit 21 selected (step S7). Furthermore, a pump operation signal is sent to the pump control panel 25 (step S8) to operate the pump (not shown).

[0020] The nozzle unit 21 that receives the water discharge instruction signal becomes a water discharge unit. Then, the position of the deflector 212 is controlled by the horizontal distance data (step S9). If the deflector 292 is strongly effective, the horizontal distance of water discharge becomes shorter, and if the deflector 292 is weak, the horizontal distance becomes longer. Also, the water discharge unit transmits its own unit identification signal and a valve open signal to the local control panel 27 via the serial wiring 262 (step S10). The local control panel 27 opens the valve of the water discharge unit in the open valve 28 (step S11). The water discharge unit stops at a position where the high temperature area is the center of the left and right of the infrared camera 213, and the directions of the infrared camera 213 and the nozzle 211 in the horizontal direction are the same, so water is discharged in the direction of the flame 4. Then, the deflector 212 adjusted by the horizontal distance data discharges water so that it falls at the flame position. As described above, in the first embodiment, the position is controlled by calculating the falling point of the discharged water to be the flame position before the water is discharged.

[0021] <Water discharge correction operation> When water discharge starts, the water discharge sensor (not shown) in the water discharge unit detects water discharge (step S12) and transmits a water discharge confirmation signal to the central operation panel 23 (step S13). The central operation panel 23 calculates horizontal angle data of each nozzle unit 21 from the stored three-dimensional position of the flame and the position of the nozzle unit 21 (step S14). Then, the central operation panel 23, which has received the water discharge signal, transmits an image capture instruction signal and horizontal angle data to the nozzle units 21 other than the water discharge unit. The nozzle unit 21, which has received the image capture instruction signal, aims the infrared camera 213 toward the flame 4 according to the horizontal angle data and captures an image (step S15). This corrects the horizontal deviation of the nozzle units 21 other than the water discharge unit. Then, the infrared image is transmitted to the central operation panel 23 (step S16).

[0022] The central operation panel 23 extracts high temperature and low temperature areas from the infrared image. The high temperature area is the position of the flame 4, and the low temperature area is the water discharge trajectory 5 shown in Fig. 3. If there is a deviation between the three-dimensional position of the high temperature area and the lower part of the low temperature area, which is the water discharge drop position, the water discharge drop position differs from the flame position, so the amount and direction of deviation are calculated, and horizontal angle data and horizontal distance data are calculated (step 17) and sent to the water discharge unit (step 18).

[0023] The water discharge unit corrects the rotation angle and the position of the deflector 212 based on the received horizontal angle data and horizontal distance data, thereby correcting the water discharge (step S19).

[0024] <Repeat Action> Image signals from the nozzle units 21 other than the water discharge unit are continuously sent to the central operation panel 23, which calculates the amount and direction of deviation, sends horizontal angle data, and sends a strength signal of the deflector 212. This feedback control causes the deviation between the water discharge point and the flame 4 to converge, and the water falls on the flame 4. After a certain time has elapsed since it was confirmed by the infrared image that low-temperature water is falling on the position of the flame 4, the central operation panel 23 sends a water discharge stop signal to the water discharge unit (step S20), and the water discharge unit sends a valve close signal to the local control panel 27 (step S21). Then, the local control panel 27 closes the valve of the release valve 28 (step S22). The valve of the water discharge unit closes and water discharge is temporarily stopped. Then, the flame detection operation, water discharge start operation, and water discharge correction operation are performed again. This is repeated.

[0025] According to the first embodiment, the water can be accurately sprayed onto the flame position, which is the three-dimensional position of the flame 4, by feedback control of the water spray correction operation. Therefore, even with a small amount of water, the water can reach the flame 4 and the heat source that is the source of the flame 4 and extinguish the fire. Furthermore, particularly when the flame 4 occurs at multiple locations, an error is likely to occur in the three-dimensional position of the flame 4, but since the sprayed water falls at one location, the error can be corrected and the water can be sprayed onto the correct position by the water spray correction operation. Furthermore, by performing the operation again, when flames 4 are occurring in multiple places, the flames 4 can be extinguished in order.

[0026] In this embodiment, in a fire extinguishing system 2 in which a plurality of nozzle units 21 each having an infrared detection unit (infrared camera 293) and a water discharge unit (nozzle 211) that can rotate horizontally are provided in a protected area (storage facility 1), when one nozzle unit 21 discharges water in the event of a fire, the nozzle 211 of the one nozzle unit 21 is controlled based on information obtained from the infrared camera 293 of the nozzle units 21 other than the one nozzle unit 21. By performing such water discharge control, water discharge from the one nozzle unit 21 can be efficiently directed at the flame 4 of the fire, and fire extinguishing efficiency can be improved. Here, it is considered that the one nozzle unit 21 can control water discharge based on information from its own infrared camera 293, for example, but the direction of water discharge toward the flame 4 overlaps with the field of view of the infrared camera 293, and heat source information cannot be obtained well.

[0027] Therefore, it is preferable to obtain information from the infrared detection unit not from one nozzle unit 21, but preferably from a nozzle unit 21d adjacent to this one nozzle unit 21 or a nozzle unit 21d diagonally opposite to this one nozzle unit 21, and judge whether there is any deviation between the water discharge trajectory 5 from the one nozzle unit 21 and the position of the flame 4. Of course, each nozzle unit such as the nozzle units 21, 21d, etc. is set with an individual ID. The central operation panel 23 specifies a nozzle unit 21d other than the nozzle unit 21 that is discharging water, and obtains information from the infrared camera 293d of the specified nozzle unit 21d. This makes it possible to detect whether there is any deviation between the low temperature area (water discharge trajectory 5) and the high temperature area (flame 4) caused by water discharge from a location different from the water discharge position. If there is any deviation, the optimal water discharge angle and the direction of the deflector 212 are transmitted from the central operation panel 23 to the nozzle unit 21 that is discharging water, and the deviation is corrected, thereby enabling effective water discharge.

[0028] FIG. 6 shows an image of the infrared camera 293d in a nozzle unit 21d other than the nozzle unit 21 discharging water. When the water discharge trajectory 5 is deviated from the flame 4 as shown in FIG. 6(A), the deflector 212 is controlled to increase the force of water discharge, so that the water discharge trajectory 5 overlaps with the flame 4 as shown in FIG. 6(B). When the water discharge trajectory is deviated as shown in FIG. 6(C), the deflector 212 is controlled to decrease the force of water discharge, so that the water discharge trajectory 5 overlaps with the flame 4 as shown in FIG. 6(B). The control can be performed by continuously applying feedback based on the image of the infrared camera 293d. According to this, even if the force of water discharge is increased too much from the state of FIG. 6(A) to the state of FIG. 6(C), the feedback will converge to the state of FIG. 6(B). Also, the infrared cameras 293d in a plurality of nozzle units 21d can be used. In this case, the three-dimensionally accurate positions of the flame 4 and the water discharge trajectory 5 can be obtained, and the nozzle unit 21 can be controlled to guide the water discharge trajectory 5 to the position of the flame 4.

[0029] <Modification of water discharge start operation> In the water discharge start operation, in the first embodiment, the position is controlled by calculating the falling point of the discharged water to be the flame position before the water is discharged. However, the above position control may not be performed or may be partially omitted. For example, the water discharge may be started in the horizontal direction only without calculating the horizontal distance data, and the falling point of the discharged water may be set to the flame position by the water discharge correction operation.

[0030] <Modification of repetitive motion> In the repeating operation of the first embodiment, after a certain time has elapsed since it was confirmed by the infrared image that the water is falling on the position of the flame 4, the valve is closed to temporarily stop the water discharge, and the flame detection operation etc. are performed again. However, when the position of the heat of the flame 4 cannot be confirmed near the position where the water is falling based on the infrared information, the water discharge may be temporarily stopped and the flame detection operation etc. may be performed again. EXAMPLES

[0031] FIG. 7 shows the nozzle unit 29 of the second embodiment. FIG. 7(A) is a side view, and FIG. 7(B) is a view seen from below. The nozzle unit 29 is provided with a deflector 292 at the tip of the nozzle 291. In addition, an infrared camera 293 as an infrared detection unit and a flame detection device 294 as a flame detection unit are provided below the nozzle 291. In FIG. 7(A), the flame detection device 294 is hidden in the shadow of the infrared camera 293. A horizontal rotation device 295 is provided on a base 297, and a nozzle stand 298 is provided thereon, on which the nozzle 291 is installed via a vertical rotation device 296. The horizontal rotation device 295 rotates the nozzle 291 in the horizontal direction, and the vertical rotation device 296 rotates the tip of the nozzle 291 in the vertical direction. The nozzle 291, the infrared camera 293, and the flame detection device 294 rotate together in the horizontal and vertical directions. A hose 299 is connected to the rear of the nozzle 291. 7(A), the axis of the infrared camera 293 passes through the axis of the vertical rotation device 296. The same applies to the flame detection device 294.

[0032] As shown by dotted lines in FIG. 7B, the nozzle 291, the infrared camera 293, and the flame detection device 294 are attached facing outward from the axis of the nozzle 291 when viewed from below. That is, the nozzle axis 291a, which is the axis of the nozzle 291, the camera axis 293a, which is the axis of the infrared camera 293, and the flame detection axis 294a, which is the axis of the flame detection device 294, intersect at the horizontal rotation axis 295a, which is the axis of the horizontal rotation device 295 when viewed from below. Therefore, the nozzle 291, the infrared camera 293, and the flame detection device 294 can be moved in the same direction, for example, by moving the flame detection axis 294a to the position of the camera axis 293a by controlling the positions of the horizontal rotation device 295 and the vertical rotation device 296. In addition, the central axes of the three devices pass through the intersection of the vertical rotation axis and the horizontal rotation axis that do not move due to rotation, and calculations can be performed using the same angular coordinates.

[0033] Nozzle unit 29 of Example 2 is equipped with vertical rotation device 296 and rotates three-dimensionally, so that it is possible to perform fire extinguishing and the like with a more appropriate water discharge trajectory 5. In addition, nozzle 291, infrared camera 293, and flame detection device 294 rotate integrally in the horizontal and vertical directions, so that the two rotation devices can control the up, down, left, and right directions of the three devices.

[0034] <Modification of Example 2> In the second embodiment, the flame detection device 294 is used, but it is also possible to detect a flame by analyzing flickering from an infrared image obtained from the infrared camera 293. In a modified example, the flame detection device 294 is not used, and the infrared camera 293 is provided directly below the nozzle 291, and the horizontal directions of the nozzle axis 291a and the camera axis 293a coincide with each other. In this modified example as well, the two rotating devices can control the up / down / left / right directions of each device. Note that the infrared camera 293 and the nozzle 291 do not have to be provided integrally as described above, and may have mechanisms for rotating separately. EXAMPLES

[0035] FIG. 8 is a diagram showing a situation where a flame 4 occurs in a valley of wood pellets 3. When the wood pellets 3 have a valley, it is assumed that a flame 4 will occur if there is a low part of the valley near a source of flammable gas. When the heat detector 22 is activated and the fire receiver 24 judges that a fire has occurred and sends a signal to the central operation panel 23 to perform a flame detection operation, the flame 4 is hidden from the flame detection device 214 by the wood pellets 3 as shown by the dotted line in FIG. 8, so that the flame cannot be detected. In such a case, in the third embodiment, the pile of wood pellets 3 that is an obstacle is blown away and removed by a rod-shaped water discharge, so that the flame 4 can be detected. Since there is a high-temperature area above the flame 4, the presence of a heat source in this direction can be captured by information from the infrared camera 293. In the third embodiment, the nozzle unit 29 equipped with the vertical rotation device 296 of the second embodiment is used. In addition, all the nozzle units 29 are provided at the same height.

[0036] Fig. 9 is a diagram showing a state in which wood pellets 3 are sprayed with water by nozzle unit 29 in Example 3. In Example 3, water is sprayed from nozzle unit 29 so that water spray trajectory 5 hits the tops of wood pellets 3. Other than the structure and operation of nozzle unit 29, it is the same as Example 1. When flame 4 is present in a valley as shown in Fig. 8, if water is sprayed below the occurring high-temperature area in the image of infrared camera 293, the sprayed water will hit the tops of wood pellets 3.

[0037] <Flame detection operation> 10 shows the inside of the storage facility 1 as seen from the infrared camera 293 of the water discharge unit. The fire extinguishing system of this embodiment operates as follows during flame detection. A flame search instruction signal is sent from the central operation panel 23 to all the nozzle units 29. When the nozzle 291 is rotated by the horizontal rotation device 295 in each nozzle unit 29, the infrared camera 293 installed below the nozzle 291 rotates to search the direction of the high temperature area 6, and stops at a position where the high temperature area 6 with the highest temperature is the center of the left and right of the infrared camera 293. Then, the horizontal rotation device 295 is rotated so that the position of the camera axis 293a at this time becomes the position of the flame detection axis 294a. As a result, the flame detection device 294 faces the high temperature area 6. Then, the flame detection device 214 judges the flame by detecting the CO2 resonance radiation specific to the flame and the fluctuation of its intensity, and transmits the result to the central operation panel 23. If the flame 4 cannot be recognized by the multiple nozzle units 29, the position of the flame 4 cannot be specified. In this case, the blowing operation is started.

[0038] On the other hand, when the flame 4 is recognized by multiple nozzle units 29, the infrared image and the horizontal and vertical rotation angles are transmitted to the central operation panel 23. The central operation panel 23 calculates the three-dimensional position of the flame 4 from the position of each nozzle unit 29, the infrared image, and the horizontal and vertical rotation angles, and sprays water in the same manner as in the first embodiment. Since the nozzle unit 21 of the second embodiment is used, the nozzle axis 291a can also be moved vertically. When spraying water, the vertical rotation angle of the vertical rotation device 296 is also controlled so that water falls from above the flame 4.

[0039] <Blowing action> If the flame 4 cannot be recognized by the multiple nozzle units 29, the vertical rotation angle of all nozzle units is controlled by the vertical rotation device 296 by a camera horizontal signal from the central operation panel 23, and the camera axis 293a, which is the detection direction, is made horizontal. Then, the horizontal rotation device 295 rotates horizontally to search and direct the camera axis 293a toward the high temperature area 6. Then, the horizontal angle is obtained and used as the horizontal rotation angle, and the data of the infrared image and the horizontal rotation angle are sent to the central operation panel 23. The central operation panel 23 calculates the planar position of the high temperature area 6 from the position of the high temperature area 6 shown in the infrared image. Then, the nearest nozzle unit 29 is selected as the water discharge unit. In the water discharge unit, the nozzle 291 is directed to the lower end of the high temperature area 6 shown in the infrared image, and the deflector 292 is set in a state where it can discharge water in a rod shape. Next, a pump operation signal is sent from the central operation panel 23 to the pump control panel 25 to operate the pump and open the valve of the water discharge unit. Here, blow water discharge is a type of water discharge in which water is sprayed onto a part of the deposit to move it, and the rod-shaped water discharge in Example 3 is a type of blow water discharge.

[0040] When water discharge starts, the horizontal rotation device 295 and the vertical rotation device 296 move the water discharge direction left and right within a predetermined angle range as shown by the arrows in Fig. 10 as water discharge movement 51, while gradually moving downward to discharge water. As a result, a rod-shaped water discharge is performed toward the area below the high temperature area 6 detected by the infrared camera 293, which is the infrared detection unit. The nozzle 291 discharges water in a rod-shaped manner with the greatest force, blowing away the wood pellets 3. When water discharge is completed, the process returns to the flame detection operation. Here, the area below the high temperature area is the part that corresponds to the top of the wood pellets 3, and is the part that is below the high temperature area.

[0041] The blowing action removes the top surface of the wood pellets 3 that hides the flame 4, making it easier to identify the position of the flame 4 in the flame detection action. It is expected that the blowing action will blow the wood pellets 3 away together with the water, covering the flame 4 and causing it to disappear. In this case, the amount of water discharged is small, so there is a possibility that the flame 4 will reappear, but the peaks and valleys of the wood pellets 3 are somewhat flattened, making it easier to check the flame 4. If the flame 4 appears in a hidden position, the blowing action is performed again.

[0042] In addition, in the blowing operation, the high temperature area 6 is detected by setting the camera axis 293a, which is the detection direction, horizontally in all the nozzle units provided at the same height. Therefore, it is easy to calculate the high temperature area 6 with a small error as a two-dimensional position when the protected area is viewed from above.

[0043] <Modification of the third embodiment> In the blowing operation of the third embodiment described above, the wood pellets 3 are blown away while changing the direction of the water discharge, as shown in Fig. 10 as the water discharge movement 51. However, the blowing operation can also be performed without changing the direction of the water discharge. It can also be moved only in the vertical direction. The above-mentioned blowing operation is also effective when the rod-shaped water discharge is relatively thick or when the wood pellets 3 tend to crumble in the area where they are blown away.

[0044] In the above embodiment and modified example, the falling direction of the discharged water can be greater than 0° and less than 45° when viewed from the vertical at the point where the water falls, and is preferably greater than 0° and less than 40°. In addition, in the blowing operation, the falling direction of the water can be greater than 50° and less than 90° when viewed from the vertical at the point where the water falls, and is preferably greater than 60° and less than 90°.

[0045] In this embodiment, the storage facility 1 in the protected area has been described as a biomass power generation warehouse storing wood pellets 3. However, instead of wood pellets 3, the present invention can also be applied to storage and accommodation facilities where no workers are stationed, such as a garbage pit where garbage is piled up and stored, or a coal silo where coal is piled up and stored.

[0046] The movable water discharge head of Patent Document 1 is used in places with flat floors such as atriums and gymnasiums. On the other hand, in storage facilities for biomass power generation, etc., the upper surface of wood pellets is usually uneven rather than flat, since they are stored close to the edge and transported using a grab bucket suspended from the ceiling. Therefore, when the movable water discharge head of Patent Document 1 is used, depending on the position of the flame, it is difficult for water to hit the pellets. Also, in storage facilities, heat is generated and flammable gas is generated deep in the pile of wood pellets, and the flammable gas reaches the nearby surface and burns, causing a flame. Therefore, a large amount of water needs to be dropped near the flame, but the movable water discharge head of Patent Document 1 sprays water from a close position to a far position at once in the direction of the flame, which requires an even larger amount of water.

[0047] In a fire extinguishing system in which a nozzle unit with a rotating infrared detection unit and a water discharge unit is provided in a protected compartment, and when a fire signal is received, the infrared detection units of a plurality of the nozzle units are rotated to detect a flame and extinguish the fire by discharging water from the water discharge unit, a flame detection operation is performed to detect the flame position from infrared information obtained by the infrared detection units of the plurality of the nozzle units, a water discharge start operation is performed to start discharging water from the water discharge unit with the nozzle unit among the plurality of the nozzle units closest to the flame position as the water discharge unit, and after the water discharge start operation, the flame position and water discharge position are detected from infrared information obtained by the infrared detection units of the water discharge units other than the water discharge unit, and a water discharge correction operation is performed to feedback control the water discharge of the water discharge unit so that it falls on the flame position, thereby making it possible to provide a fire extinguishing system that accurately discharges water to the position of the flame. [Explanation of symbols]

[0048] 1 Storage facility, 11 Wall surface, 12 Ceiling surface, 2 Fire extinguishing system, 21 Nozzle unit, 21d Nozzle unit, 211 Nozzle, 212 Deflector, 213 Infrared camera, 213d Infrared camera, 214 Flame detection device, 215 Horizontal rotation device, 216 Base, 22 Heat detector, 23 Central operation panel, 24 Fire receiver, 25 Pump control panel, 261 Serial wiring, 262 Serial wiring, 27 Local control panel, 28 Release valve, 29 Nozzle unit, 291 Nozzle, 291a Nozzle axis, 292 Deflector, 293 Infrared camera, 293a Camera axis, 294 Flame detection device, 294a Flame detection axis, 295 Horizontal rotation device, 295a Horizontal rotation axis, 296 Vertical rotation device, 297 Base, 298 Nozzle base, 299 Hose, 3 Wood pellets, 4 Flame, 5 Water jet trajectory, 51 Water jet movement, 6 Hot area

Claims

1. In a storage facility where wood pellets are stored so that the top surface is uneven, a movable water discharge unit that controls direction by detection is provided, The protection section is provided with an infrared detection unit and a nozzle unit in which the water discharge unit rotates, A fire extinguishing system that detects a flame by rotating the infrared detection units of the plurality of nozzle units when a fire signal is received, and extinguishes the flame by discharging water from the water discharging unit, A flame detection operation is performed to detect a flame position from infrared information obtained by the infrared detection units of the plurality of nozzle units; a water discharge start operation is performed to start discharging water from the water discharge section by using the nozzle unit closest to the flame position among the plurality of nozzle units as a water discharge unit; The storage facility is divided into a number of areas, each of which is equipped with a differential distribution type heat detector with an air pipe running along the ceiling surface, a fire receiver that receives fire signals from the plurality of heat detectors, and a central control panel that sends an alarm signal when the fire receiver determines that there is a fire, and when a fire occurs, the opening of the nozzle unit's open valve is controlled from the central control panel. This fire extinguishing system is characterized by the above.

2. The fire extinguishing system according to claim 1, characterized in that the central control panel extracts high temperature areas which are the location of the flame and low temperature areas which are the trajectory of the water discharge from the infrared image obtained by the infrared detection unit, and detects the location of the flame and the location of the water discharge.

3. 2. The fire extinguishing system according to claim 1, wherein the nozzle units are connected to the central operation panel by wiring and are also connected to a local control panel by separate wiring.

4. In a facility for storing sediment having an uneven surface, a movable water discharge unit that controls direction by detection is provided, The protection section is provided with an infrared detection unit and a nozzle unit in which the water discharge unit rotates, A fire extinguishing system that detects a flame by the infrared detection units of the plurality of nozzle units when a fire signal is received, and extinguishes the flame by spraying water from the water spray unit, A flame detection operation is performed to detect a flame position from infrared information obtained by the infrared detection units of the plurality of nozzle units; performing a water-discharging start operation in which any one of the plurality of nozzle units is used as a water-discharging unit to start discharging water from the water-discharging section; a water-discharging correction operation is performed to feedback-control the water discharge of the water-discharging unit so that the water falls on the flame position based on infrared information obtained by the infrared detection unit of the nozzle unit other than the water-discharging unit after the water-discharging start operation.

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