Method for simulating failure of fire monitor in oil-filled equipment explosion environment

Abstract

The application discloses a kind of methods for judging the failure of fire monitor in simulating oil-filled equipment combustion environment, the method comprises: selecting flat test site, arranging two pressure test lines, a plurality of pressure test points are arranged in each pressure test line, explosion center and each pressure test point are linearly arranged at equal intervals, infrared thermal imager and camera are arranged at the first preset distance from explosion center, and unmanned aerial vehicle is arranged at the second preset distance above explosion center, flow field parameters are obtained by carrying out multiple oil combustion experiments, flow field parameters include the pressure and temperature of each pressure test point, the size of fireball corresponding to explosion center;Fire monitor is placed to corresponding pressure test point from far to near in turn in each experiment from explosion center, oil combustion experiment is carried out, in the case of failure, the flow field parameters of this experiment are used as its failure condition;The application has the advantages that the failure conditions of fire monitor around large oil-filled equipment are studied, the fire extinguishing effect of fire monitor system is guaranteed, and safety hazards are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale transformer power transmission fire protection, and in particular to a method for simulating the explosion environment of oil-filled equipment to judge the failure of a fire monitor. Background Art

[0002] Large oil-filled equipment typically contains over 130 tons of oil. If an explosion or fire occurs, the impact is massive and high. Currently, fire monitors utilize conventional housings, without considering the unique explosion and fire scenarios of large oil-filled equipment. Their fire resistance and explosion resistance properties are insufficient to meet the actual firefighting requirements of large oil-filled equipment in UHV converter stations and substations. Section 5.2 of the national standard GB 19156-2019, "Fire Monitors," stipulates the explosion-proof requirements for component performance, stating that "Fire monitors with explosion-proof requirements shall comply with the relevant provisions of GB 3836.2." This standard only sets explosion-proof requirements for the monitor itself and does not address requirements for monitors to effectively withstand external impacts or explosion resistance.

[0003] Fire monitor systems have been deployed around large oil-filled equipment to prevent potential fires and explosions. However, current fire monitors utilize conventional cannon bodies, without considering the unique fire scenarios of large oil-filled equipment. Their fire resistance and explosion resistance make them inadequate for the firefighting equipment required for large oil-filled equipment in UHV converter stations and substations. Due to the high-voltage safety live distance restrictions, fire monitors are typically deployed close to large oil-filled equipment. Their performance is significantly impacted by the impact of explosions and fires, posing a risk of failure. In practice, the failure of a fire monitor is only detected when the corresponding fire monitor is triggered. This failure is detrimental to fire control, making it difficult to extinguish the fire in a timely manner and posing a significant safety hazard. Therefore, analyzing the failure conditions of fire monitors has become a key research topic.

[0004] In the field of large-scale transformer power transmission fire protection technology, most of the design focuses on the structure of the fire monitor itself and the fire extinguishing principles of the fire extinguishing system. For example, Chinese Patent Publication No. CN111790082A discloses an operation control method for a fire extinguishing system suitable for an ultra-high voltage converter station, and Chinese Patent Publication No. CN107485817A discloses a mobile experimental platform for three-phase jet fire extinguishing technology and its application method. However, there is no research on the failure conditions of fire monitors around large oil-filled equipment. Therefore, it is difficult to predict whether the fire monitor will fail in the event of a fire or explosion in the oil-filled equipment, and the fire extinguishing effect of the fire monitor system cannot be guaranteed, posing a safety hazard. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing technology lacks research on the failure conditions of fire monitors around large oil-filled equipment. It is difficult to predict whether the fire monitors will fail in the event of a fire or explosion in the oil-filled equipment, and thus the fire extinguishing effect of the fire monitor system cannot be guaranteed, posing a safety hazard.

[0006] The present invention solves the above technical problems through the following technical means: a method for simulating the explosion environment of oil-filled equipment to determine the failure of fire monitors, the method comprising:

[0007] Step a: Select a flat test site and arrange two pressure test lines at 90 degrees to each other with the explosion center as the center. Set a number of pressure test points on each pressure test line. The explosion center and each pressure test point are arranged linearly with equal spacing. Place an infrared thermal imager and a video camera at a first preset distance from the explosion center, and place an unmanned aerial vehicle at a second preset distance above the explosion center. Conduct multiple oil explosion experiments to obtain flow field parameters, including the pressure and temperature of each pressure test point and the size of the fireball corresponding to the explosion center.

[0008] Step b: Set the same experimental conditions as step a and record the corresponding flow field parameters. For each experiment, place fire monitors at the corresponding pressure test points from far to near the explosion center to conduct oil combustion and explosion experiments. For each experiment, analyze the components of the fire monitor and evaluate its performance to determine whether the fire monitor has failed. In the case of failure, the flow field parameters of this experiment are used as its failure condition. If it has not failed, place the fire monitor that has not failed at a pressure test point closer to the explosion center and continue the experiment until the fire monitor fails. Record the corresponding flow field parameters as the failure condition.

[0009] Furthermore, before step a, the method further includes:

[0010] Collect actual accident data and design an oil spill device that meets the explosion conditions in the accident explosion environment based on the accident data, with the oil spill device as the explosion center.

[0011] Furthermore, the oil spreading device includes a detonator, a booster charge column, a central charge column, an oil filling area, an outer shell and a container cover, the detonator, the booster charge column and the central charge column are connected in sequence, and the diameter of the detonator is smaller than the diameter of the booster charge column, the diameter of the booster charge column is smaller than the diameter of the central charge column, the top of the central charge column is fixedly connected to the container cover, the central charge column is placed in the outer shell, the upper edge of the outer shell is fixedly connected to the container cover, the area outside the central charge column in the outer shell forms an oil filling area, the central charge column is filled with explosives, and the oil filling area is filled with oil.

[0012] Furthermore, based on a large number of experimental tests, no matter how many liters of oil spraying device (a cylinder with an aspect ratio of 1.75), the diameter of the central charge column is 1 / 5 of the diameter of the outer shell of the oil spraying device. If the effect of directly detonating the oil in the oil spraying device is to be achieved, the height of the central charge column inside the oil spraying device should be the same as the height of the outer shell of the oil spraying device. If the effect of secondary detonation is to be achieved, the height of the central charge column should be 2 / 3 times the height of the outer shell of the oil spraying device.

[0013] Furthermore, the explosion center and each pressure test point are arranged linearly with equal spacing, including:

[0014] The explosion center is the coordinate origin, and each pressure test point on the two pressure test lines is 2m, 3m, 4m, 6m, 8m, 10m, and 12m away from the explosion center respectively.

[0015] Furthermore, the first preset distance is 20m to 30m, and the second preset distance is 40m to 60m.

[0016] Furthermore, each pressure test point is provided with a pressure sensor, which is placed in a pressure sensor base. The pressure sensor base is buried in the ground corresponding to each test point. The data of each pressure sensor is transmitted to the data collector through the data acquisition line, and the data collector transmits the collected data to the host computer.

[0017] Furthermore, after step c, the following steps are further included:

[0018] According to the failure conditions of fire monitors, protective measures for fire monitors are given.

[0019] Furthermore, the fire monitor protection measures include:

[0020] The pressure test point where the fire monitor is located is known according to the failure condition of the fire monitor, and the fire monitor is arranged at other pressure test points, and the distance between the other pressure test points and the explosion center is greater than the distance between the pressure test point where the fire monitor is located and the explosion center.

[0021] Furthermore, the infrared thermal imager collects temperature, and the camera and the drone jointly collect fuel spill diameter and fireball size.

[0022] The advantages of the present invention are: the present invention simulates the combustion and explosion environment of oil-filled equipment to judge the failure of the fire monitor, and reliably analyzes the failure conditions of the fire monitor, so as to predict whether the corresponding fire monitor will fail in the event of a fire or explosion of the oil-filled equipment, so as to avoid the occurrence of failure conditions in actual applications according to its failure conditions, and provide protective measures based on evidence to ensure the fire extinguishing effect of the fire monitor system, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of an oil-spraying device in a method for simulating an explosion environment of oil-filled equipment to determine failure of a fire monitor disclosed in an embodiment of the present invention;

[0024] Figure 2 This is a diagram of the test system layout in a method for judging fire monitor failure by simulating an explosion environment of oil-filled equipment disclosed in an embodiment of the present invention;

[0025] Figure 3 A schematic structural diagram of a pressure sensor base in a method for judging fire monitor failure by simulating an explosion environment of oil-filled equipment disclosed in an embodiment of the present invention;

[0026] Figure 4 This is a picture of the on-site detonation of an oil explosion experiment in a method for judging the failure of a fire monitor by simulating the explosion environment of an oil-filled device disclosed in an embodiment of the present invention;

[0027] Figure 5 A thermal image of an infrared thermal imager in a method for judging failure of a fire monitor by simulating an explosion environment of oil-filled equipment disclosed in an embodiment of the present invention;

[0028] Figure 6 This is a temperature distribution diagram of an infrared thermal imager at different test times in a method for judging fire monitor failure by simulating an explosion environment of oil-filled equipment disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] like Figures 1 to 3 As shown, the present invention provides a method for judging the failure of a fire monitor by simulating the explosion environment of an oil-filled device, the method comprising:

[0031] S1. Collect actual accident data and design an oil-spraying device that meets the explosion conditions in the accident explosion environment based on the accident data. The oil-spraying device is the explosion center 8. The explosion center 8 is connected to the initiator 7 via a lead.

[0032] like Figure 1As shown, the oil spraying device includes a detonator 1, an explosive column 2, a central charge column 3, an oil filling area 4, an outer shell 5 and a container cover 6. The detonator 1, the explosive column 2 and the central charge column 3 are connected in sequence, and the diameter of the detonator 1 is smaller than the diameter of the explosive column 2, the diameter of the explosive column 2 is smaller than the diameter of the central charge column 3, the top of the central charge column 3 is fixedly connected to the container cover 6, the central charge column 3 is placed in the outer shell 5, the upper edge of the outer shell 5 is fixedly connected to the container cover 6, the area outside the central charge column 3 in the outer shell 5 forms an oil filling area 4, the central charge column 3 is filled with explosives, the explosives are aluminum-containing explosives, and the oil filling area 4 is filled with oil. The outer shell 5 is a PVC outer shell 5. After the oil filling area 4 is filled with oil, the container cover 6 is fixed to the outer shell 5 with AB glue. Combined Figure 2 The detonator 1 is an electric detonator 1, which is connected to the detonator 7 via a copper wire. The detonator 7 and the operator are both at a safe distance. The detonator 7 is essentially a device that can emit current pulses and is powered by two No. 5 dry batteries. After the detonator 7 is turned on, current passes through the electric detonator 1 and it will explode. By triggering the detonator 1, the aluminum-containing explosive in the explosive column 2 and the center charge column 3 is detonated, causing the oil to be scattered and detonated. Video is taken at a safe distance to obtain the parameters of the spreading diameter, fireball diameter and ignition position, and compared with the actual accident parameters. If the actual accident explosion conditions are not met, the size of the oil-scattering device and the charge of the center charge column 3 are adjusted until the actual accident conditions are met, thereby simulating the actual explosion environment of the oil-filled equipment.

[0033] According to a large number of experimental tests, no matter how many liters of oil spraying device (a cylinder with an aspect ratio of 1.75) there are, the diameter of the central charge column 3 is 1 / 5 of the diameter of the outer shell 5 of the oil spraying device. If the effect of directly detonating the oil in the oil spraying device is to be achieved, the height of the central charge column 3 inside the oil spraying device should be the same as the height of the outer shell 5 of the oil spraying device. If the effect of secondary detonation is to be achieved, the height of the central charge column 3 should be 2 / 3 times the height of the outer shell 5 of the oil spraying device.

[0034] S2, such as Figure 2 As shown, a flat test site is selected, and two pressure test lines are arranged at 90 degrees to each other with the explosion center 8 as the center. Each pressure test line is provided with a number of pressure test points. The explosion center 8 and each pressure test point are arranged linearly with equal spacing. In this embodiment, the explosion center 8 is the coordinate origin. Seven pressure test points are set on both pressure test lines, and each pressure test point is respectively 2m, 3m, 4m, 6m, 8m, 10m, and 12m away from the explosion center 8. Each pressure test point is provided with a pressure sensor 9, which is placed in a pressure sensor base, and the pressure sensor base is buried in the ground corresponding to each test point.

[0035] like Figure 3As shown, in this embodiment, the pressure sensor base includes a base cover 10 and a base body 11. The base cover 10 is circular and the base body 11 is a hollow cylinder. The base cover 10 covers the base body 11. Threaded holes 12 are provided on the edge of the base cover 10 and above the base body 11 at the corresponding position. Before arranging the pressure test point, the distance between the measuring point and the explosion center 8 is first determined by measurement. After measuring the distance, a pit is dug at the corresponding position and the pressure sensor base is placed in the pit with the base cover 10 flush with the ground. Then, the pressure sensor 9 is installed on the base cover 10 in turn, and the data acquisition line 13 is connected to the pressure sensor 9 through the threading hole. Finally, the base cover 10 is fixed to the pressure sensor base with bolts at the threaded hole 12.

[0036] After all pressure test points are set up, connect the data acquisition line 13 to the data acquisition device 14. Connect the data acquisition device 14 to the host computer 15 via a network cable. At this point, the pressure test system is ready. An infrared thermal imager 16 and a camera 17 are placed 825 meters from the explosion center, with the cameras of the infrared thermal imager 16 and camera 17 facing the side where each pressure test point is located. A drone 18 is also placed 50 meters above the explosion center 8. The infrared thermal imager 16 collects temperature, and the camera 17 and drone 18 jointly collect fuel spray diameter and fireball size.

[0037] In this embodiment, infrared thermal imager 16 and video camera 17 are mounted on a tripod at a safe distance. Infrared thermal imager 16 is connected to infrared thermal imager computer 19 and video camera 17 is connected to video camera computer 20 via a network cable. The images captured are of ground zero 8 and fire monitor 21, with clear modulation. The frame rate for infrared thermal imager 16 is set to 20 fps, while the frame rate for video camera 17 is set to 1000 fps. Drone 18 is responsible for capturing an overhead view of the fireball, with clear modulation and a frame rate of 60 fps.

[0038] Once the test system is deployed, the experimenters retreat to a safe distance, where specialists load the fuel, aluminum-containing explosives, and install detonator 1. After the homemade fuel dispensing device is loaded and all personnel retreat to a safe distance, each test system enters a data acquisition state. Professionals use initiators 7 to trigger detonator 1 to complete the fuel explosion simulation experiment. Flow field parameters are obtained from three fuel explosion experiments. These flow field parameters include the pressure and temperature at each pressure test point, and the size of the fireball corresponding to the explosion center 8.

[0039] S3. Set the same experimental conditions as in step S2 and record the corresponding flow field parameters. For each experiment, place the fire monitor 21 at the corresponding pressure test point from far to near the explosion center 8, and conduct the oil explosion experiment. After each experiment, take photos of the scene and analyze whether the control box, motor, exposed cable, camera, terminal release device and the overall structure of the fire monitor 21 are damaged or functionally incomplete (refer to the various provisions in "GB19156-2003-General Technical Conditions for Fire Monitors" and "GB19157-2003-General Technical Conditions for Remote Control Fire Monitor Systems") to determine whether the fire monitor 21 has failed. In the case of failure, the flow field parameters of this experiment are used as its failure condition. If it has not failed, place the fire monitor 21 that has not failed at a pressure test point closer to the explosion center 8, continue the experiment until the fire monitor 21 fails, and record the corresponding flow field parameters as the failure condition.

[0040] S4. Provide protective measures for the fire monitor 21 based on the failure condition of the fire monitor 21. The protective measures for the fire monitor 21 may include: determining the pressure test point where the fire monitor 21 is located based on the failure condition of the fire monitor 21, and placing the fire monitor 21 at other pressure test points, with the distance of the other pressure test points from the center of explosion 8 being greater than the distance of the pressure test point where the fire monitor 21 is located from the center of explosion 8. The protective measures for the fire monitor 21 may also include: given the failure condition of the fire monitor 21, finding the corresponding fire monitor 21 model, the pressure and temperature of the pressure test point, and thereby determining the pressure tolerance level and temperature tolerance range of the fire monitor 21, and then selecting a fire monitor 21 of another model. The pressure tolerance level and temperature tolerance range of the other model are greater than those of the failed fire monitor 21. In practical applications, the pressure tolerance level and temperature tolerance range are equivalent to the explosion resistance performance of the fire monitor 21. Therefore, a fire monitor 21 of another model may be selected, and the explosion resistance performance of the other model is better than that of the failed fire monitor 21.

[0041] The effects of the present invention are analyzed through specific simulation experiments below:

[0042] Table 1 below shows the parameter settings for the oil explosion experiment.

[0043] Table 1 Parameter setting table for oil explosion experiment

[0044]

[0045] like Figure 4 The following pictures are given of the detonation scene of the oil explosion experiment: Figure 5 The thermal image of the infrared thermal imager 16 is given. Figure 6 The temperature distribution diagram of the infrared thermal imager 16 at different test times is given. Figures 4 to 6It can be seen that the present invention conducts a combustion and explosion experiment simulating a large oil-filled equipment and records relevant data, and can obtain relevant experimental data, so as to obtain the failure conditions of the fire monitor 21 according to the method steps of the above steps S1 to S4, and then predict whether the corresponding fire monitor 21 will fail in the event of a fire or explosion in the oil-filled equipment based on the failure conditions, so as to avoid the occurrence of failure conditions in actual applications, give protective measures based on evidence, and ensure the fire extinguishing effect of the fire monitor 21 system, which is safe and reliable.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for judging the failure of a fire monitor by simulating the explosion environment of an oil-filled device, characterized in that: The method comprises: Step a: Select a flat test site and arrange two pressure test lines at 90 degrees to each other with the explosion center as the center. Set a number of pressure test points on each pressure test line. The explosion center and each pressure test point are arranged linearly with equal spacing. Place an infrared thermal imager and a video camera at a first preset distance from the explosion center, and place an unmanned aerial vehicle at a second preset distance above the explosion center. Conduct multiple oil explosion experiments to obtain flow field parameters, including the pressure and temperature of each pressure test point and the size of the fireball corresponding to the explosion center. Step b: Set the same experimental conditions as step a and record the corresponding flow field parameters. For each experiment, place fire monitors at the corresponding pressure test points from far to near the explosion center to conduct oil combustion and explosion experiments. For each experiment, analyze the components of the fire monitor and evaluate its performance to determine whether the fire monitor has failed. In the case of failure, the flow field parameters of this experiment are used as its failure condition. If it has not failed, place the fire monitor that has not failed at a pressure test point closer to the explosion center and continue the experiment until the fire monitor fails. Record the corresponding flow field parameters as the failure condition.

2. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 1 is characterized in that: The step a also includes: Collect actual accident data and design an oil spill device that meets the explosion conditions in the accident explosion environment based on the accident data, with the oil spill device as the explosion center.

3. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 2, characterized in that: The oil spreading device includes a detonator, a detonating charge column, a central charge column, an oil filling area, an outer shell and a container cover. The detonator, the detonating charge column and the central charge column are connected in sequence, and the diameter of the detonator is smaller than the diameter of the detonating charge column, the diameter of the detonating charge column is smaller than the diameter of the central charge column, the top of the central charge column is fixedly connected to the container cover, the central charge column is placed in the outer shell, the upper end edge of the outer shell is fixedly connected to the container cover, the area outside the central charge column in the outer shell forms an oil filling area, the central charge column is filled with explosives, and the oil filling area is filled with oil.

4. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 3 is characterized in that: The diameter of the central charge column is 1 / 5 of the diameter of the outer shell of the entire oil spraying device, and the height of the central charge column is the same as the height of the outer shell of the oil spraying device or the height of the central charge column is 2 / 3 times the height of the outer shell of the oil spraying device.

5. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 1 is characterized in that: The explosion center and each pressure test point are arranged linearly with equal spacing, including: The explosion center is the coordinate origin, and each pressure test point on the two pressure test lines is 2m, 3m, 4m, 6m, 8m, 10m, and 12m away from the explosion center respectively.

6. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 1 is characterized in that: The first preset distance is 20m~30m, and the second preset distance is 40m~60m.

7. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 1 is characterized in that: Each pressure test point is provided with a pressure sensor, which is placed in a pressure sensor base. The pressure sensor base is buried in the ground corresponding to each test point. The data of each pressure sensor is transmitted to the data collector through the data acquisition line, and the data collector transmits the collected data to the host computer.

8. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 1 is characterized in that: After step b, the following steps are also included: According to the failure conditions of fire monitors, protective measures for fire monitors are given.

9. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 8, characterized in that: The fire monitor protection measures include: The pressure test point where the fire monitor is located is known according to the failure condition of the fire monitor, and the fire monitor is arranged at other pressure test points, and the distance between the other pressure test points and the explosion center is greater than the distance between the pressure test point where the fire monitor is located and the explosion center.

10. The method for judging fire monitor failure by simulating the explosion environment of oil-filled equipment according to claim 1, characterized in that: The infrared thermal imager collects temperature, and the camera and the drone jointly collect fuel spray diameter and fireball size.

Images