Simulation Experimental Device for Reducing Fire Accidents of Sealing Rings

Abstract

The present application relates to the technical field of safe storage of oil and gas, and provides a simulation experimental device for reducing seal ring fire accidents. The experimental device simulates a target tank containing fuel through a test tank body with an open upper end and a barrel structure filled with fuel. A liftable floating disk in the barrel structure inside the test tank body simulates the floating disk of the target tank body. The lower bottom surface of the liftable floating disk adsorbs on the fuel surface to simulate the mutual contact between the floating disk and the fuel in the target tank body. The annular gap between the liftable floating disk and the inner side wall of the barrel structure of the test tank body simulates the seal ring gap in the target tank body. By using the height adjustment of the liftable floating disk in the vertical direction, the relationship between the positions of floating disks at different heights and the fire accident when a seal ring fire occurs in the target tank body is simulated, and the flame merging situation and fuel boiling time in different combustion periods are analyzed, providing technical support for fire fighting and rescue and personnel evacuation.

Description

Technical Field

[0001] This application relates to the technical field of oil and gas safety storage, and particularly relates to a simulation experiment device for reducing seal ring fire accidents. Background Art

[0002] In places such as oil companies, refineries, petrochemical plants, etc., a large amount of oil products are stored in floating roof tanks. In the leakage accidents of floating roof tanks, the most common one is the seal ring fire. In the seal ring fire, if the fire is not extinguished in time at the initial stage of the fire, there is likely to occur a special flame phenomenon in the seal ring fire of a floating roof oil tank - the flame merging phenomenon. This extreme fire phenomenon is very destructive, and the spread of the fire will rapidly expand, posing a huge threat to the safety of surrounding personnel and facilities, and it is difficult to carry out fire fighting and rescue work. Therefore, the assessment of the seal ring fire is crucial.

[0003] Based on the theory that the actual seal ring fire of the storage tank mainly concentrates on the circular seal ring at the initial stage of combustion, at present, a hollow circular device (a circular oil pool with a hollow in the middle, as shown in Figure 1 is mainly used to simulate the seal ring fire. This circular oil pool with a hollow in the middle does not retain the floating roof part of the real storage tank, and the parameters measured in the simulated circular fire experiment are very different from the real seal ring fire.

[0004] Therefore, there is an urgent need to provide a technical solution to address the above deficiencies in the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a simulation experiment device for reducing seal ring fire accidents to solve or alleviate the problems existing in the above prior art.

[0006] To achieve the above purpose, this application provides the following technical solutions:

[0007] This application provides a simulation experiment device for reducing seal ring fire accidents, which is used to simulate the seal ring fire of a target tank filled with fuel, and includes: a test tank, which is a barrel-shaped structure with an open upper end, and the test tank is filled with fuel; a liftable floating roof, which is located inside the barrel-shaped structure of the test tank, the lower bottom surface adheres to the surface of the fuel, and there is an annular gap between the lower bottom surface and the inner side wall of the barrel-shaped structure of the test tank; wherein, the height of the liftable floating roof can be adjusted in the vertical direction.

[0008] Preferably, the liftable floating roof includes: a floating roof adsorption unit, the lower bottom surface of which adheres to the surface of the fuel; a floating roof moving unit, the lower end of which is slidably inserted into the floating roof adsorption unit and can move up and down relative to the floating roof adsorption unit in the vertical direction.

[0009] Preferably, the floating disk adsorption unit is a barrel-shaped structure with an open upper end. An inner annular ear plate extends radially inward along the upper opening. A plurality of vertically distributed chutes are arranged on the inner side wall in a circumferential direction, and a plurality of pressure balance holes are formed on the top surface. The floating disk moving unit is a barrel-shaped structure with an open lower end. An outer annular ear plate extends radially outward along the lower opening, and a plurality of vertically distributed sliding blocks are arranged on the outer side wall of the outer annular ear plate in a circumferential direction. Among them, a plurality of the vertically distributed sliding blocks are correspondingly inserted and slidably mounted in a plurality of the vertically distributed chutes. The inner annular ear plate, the outer annular ear plate, the inner side wall of the floating disk adsorption unit, and the outer side wall of the floating disk moving unit form an annular cavity. The pressure balance holes are communicated with the annular cavity.

[0010] Preferably, it further includes: a guiding and sealing column and an adjusting push rod. The guiding and sealing column is a cylindrical structure with openings at both ends. The lower end is detachably and penetratively connected to the bottom of the barrel-shaped structure of the test tank body, and the upper end penetrates the bottom of the barrel-shaped structure of the floating disk adsorption unit and extends into the barrel-shaped structure of the floating disk adsorption unit. The adjusting push rod is slidably sleeved in the cylindrical structure of the guiding and sealing column. The upper end is detachably connected to the bottom plate of the barrel-shaped structure of the floating disk moving unit, and the lower end is connected with a telescopic driving unit. And an air flow channel is further arranged on the adjusting push rod. The upper end of the air flow channel is communicated with an air flow through hole arranged on the bottom plate of the barrel-shaped structure of the floating disk moving unit, and the lower end of the air flow channel is located outside the bottom plate of the barrel-shaped structure of the test tank body. Among them, the telescopic driving unit is used to drive the adjusting push rod to move up and down in the vertical direction.

[0011] Preferably, a limiting groove is further arranged on the side wall of the adjusting push rod, and an elastic limiting member is installed in the limiting groove. The limiting groove is located between the lower end of the air flow channel and the bottom plate of the barrel-shaped structure of the test tank body.

[0012] Preferably, the liftable floating disk is made of titanium alloy.

[0013] Beneficial effects:

[0014] In the simulation experiment device for reducing seal ring fire accidents provided by the embodiments of the present application, a test tank filled with fuel is simulated by an upper-open barrel-shaped structure to simulate a target tank filled with fuel. A liftable floating disc in the barrel-shaped structure inside the test tank simulates the floating disc of the target tank. The lower bottom surface of the liftable floating disc adsorbs on the fuel surface to simulate the mutual contact between the floating disc and the fuel in the target tank. The annular gap between the liftable floating disc and the inner side wall of the barrel-shaped structure of the test tank simulates the seal ring gap in the target tank, so as to simulate the seal ring fire of the target tank filled with fuel. By adjusting the height of the liftable floating disc in the vertical direction, the relationship between the positions of floating discs at different heights and the fire accident during fuel combustion when a seal ring fire occurs in the target tank is simulated, and then the flame merging situation and fuel boiling time in different combustion periods are analyzed, providing technical support for fire fighting and rescue and personnel evacuation to ensure full response to complex fire situations and provide more sufficient rescue time for trapped personnel. Description of the Drawings

[0015] The specification drawings forming a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application.

[0016] Among them:

[0017] Figure 1 is a schematic structural diagram of a hollow annular device for simulating seal ring fire in the prior art;

[0018] Figure 2 is a schematic structural diagram of a simulation experiment device for reducing seal ring fire accidents according to some embodiments of the present application;

[0019] Figure 3 is a schematic structural diagram of a liftable floating disc according to some embodiments of the present application;

[0020] Figure 4 is Figure 3 a cross-sectional view of the liftable floating disc shown;

[0021] Figure 5 is Figure 4 a schematic structural diagram of the floating disc adsorption unit in the liftable floating disc shown;

[0022] Figure 6 is Figure 5 a schematic structural diagram of the floating disc moving unit in the liftable floating disc shown;

[0023] Figure 7 is a schematic structural diagram of a guiding and sealing column according to some embodiments of the present application;

[0024] Figure 8Schematic structural diagram of an adjusting push rod provided according to some embodiments of the present application;

[0025] Figure 9 is Figure 8 Cross-sectional view of the adjusting push rod shown;

[0026] Figure 10 Schematic flow diagram of a method for analyzing the accident consequences of reducing the fire accident of a sealing ring provided according to some embodiments of the present application;

[0027] Figure 11 Schematic diagram of the scenario of sealing ring fire simulation provided according to some embodiments of the present application;

[0028] Figure 12 is Figure 11 Schematic diagram of the result of the sealing ring fire simulation shown.

[0029] Explanation of reference numerals:

[0030] 1. Test tank body; 2. Liftable floating disc; 3. Guide sealing column; 4. Adjusting push rod; 5. Lift driving unit; 6. Elastic limiting member;

[0031] 201. Floating disc adsorption unit; 203. Floating disc moving unit; 211. Adsorption cylinder body; 221. Adsorption bottom cover; 231. Vertical sliding groove; 241. Pressure balance hole; 251. Installation through hole; 212. Ventilation hole; 222. Air flow through hole;

[0032] 401. Air flow channel. Detailed implementation manners

[0033] The present application will be described in detail below with reference to the drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application rather than limiting the present application. In fact, those skilled in the art will clearly understand that modifications and variations can be made to the present application without departing from the scope or spirit of the present application. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention shall fall within the scope of protection of the embodiments of the present invention.

[0034] When a sealing ring fire occurs in a real storage tank, although the fuel below the floating disc is not burning, there is a complex heat transfer process with the burning liquid surface. In the prior art, a hollow annular device (a hollow annular oil pool in the middle, such as Figure 1 shown) only uses a stainless steel annular structure with a hollow in the middle and lacks the floating disc part of a real storage tank, making it difficult to truly and effectively simulate the real situation when a sealing ring fire occurs.

[0035] Based on this, an embodiment of the present application proposes a simulation experimental device for reducing the fire accident of the sealing ring. A floating disk type annular oil pool fire with adjustable lifting is used to simulate the fire of the sealing ring. The hollow lifting floating disk is used to simulate the floating disk structure of the external floating roof tank (target tank), replacing the hollow type annular device in the traditional simulation experiment, which is more in line with the real state of the sealing ring fire and the annular fire, and is more conducive to the analysis of the actual floating roof tank sealing ring fire.

[0036] As Figures 2 to 9 shown, the simulation experimental device for reducing the fire accident of the sealing ring for simulating the fire of the sealing ring of the target tank filled with fuel includes: a test tank body 1 and a liftable floating disk 2. The test tank body 1 is a barrel-shaped structure with an open upper end, and is filled with the same fuel as that in the target tank (external floating roof tank) inside, and is used to simulate the external floating roof tank; the liftable floating disk 2 is located inside the barrel-shaped structure of the test tank body 1 and is used to simulate the floating disk structure inside the external floating roof tank; the lower bottom surface of the liftable floating disk 2 adsorbs on the fuel surface to simulate the mutual contact between the floating disk structure of the external floating roof tank and the fuel; there is an annular gap between the liftable floating disk 2 and the inner side wall of the test tank body 1, which is used to simulate the sealing ring gap between the inner side wall of the external floating roof tank and the floating disk structure of the external floating roof tank, so as to simulate the fire of the sealing ring of the target tank filled with fuel.

[0037] At the same time, the liftable floating disk 2 can be telescoped in the test tank body 1 in the vertical direction to adjust the height of the liftable floating disk 2, and then simulate the relationship between the floating disk positions at different heights and the fire accident during fuel combustion when a sealing ring occurs in the external floating roof tank, and then analyze the flame merging situation and fuel boiling time in different combustion periods, providing technical support for fire fighting and rescue and personnel evacuation to ensure full response to complex fire situations and provide more sufficient rescue time for trapped personnel.

[0038] In the present application, the test tank body 1 is located on the fireproof board through the lower bracket. That is to say, a bracket is provided on the bottom surface of the barrel-shaped structure of the test tank body 1 to support the test tank body 1; at the same time, the bracket is located on the fireproof board, and a weighing sensor is provided on the fireproof board. The weighing sensor is used to monitor the mass change in real time during the experiment. Here, the fireproof board can isolate the temperature during the experiment to protect the sensor or other equipment and improve the accuracy of data collection.

[0039] An image acquisition device (such as a camera) is provided outside (side or above) the test tank body 1 for acquiring images of the characteristic changes (such as the change in the shape of the flame) during the experiment; a thermocouple tree is also provided outside the test tank body 1, and a plurality of thermocouples are arranged along the axis of the test tank body 1 on the thermocouple tree for monitoring the flame temperature during the experiment. In addition, the heat radiation during the experiment can be monitored in real time by a heat flux meter arranged on the side of the test tank body. At the same time, the load cell, the image acquisition device, the thermocouple tree, and the heat flux meter are all connected to a data acquisition board, and the data acquisition board is connected to a data processing device.

[0040] In this application, the liftable floating disc 2 is located inside the barrel structure of the test tank body 1, and the lower bottom surface is in contact with the top surface of the fuel contained in the test tank body 1; the liftable floating disc 2 is a hollow structure and can float on the top surface of the fuel under the buoyancy of the fuel, and the lower bottom surface of the liftable floating disc 2 is simultaneously adsorbed by the fuel surface. Therefore, when the top surface of the liftable floating disc 2 moves upward, the lower bottom surface of the liftable floating disc 2 can be adsorbed on the fuel surface to prevent the liftable floating disc 2 from detaching from the fuel. At the same time, the up and down movement of the top surface of the liftable floating disc 2 can effectively change the air volume inside the hollow structure of the liftable floating disc 2, so as to effectively slow down the conductive heat feedback of the fuel covered by the lower bottom surface of the liftable floating disc 2 during fuel combustion.

[0041] In a specific example, the liftable floating disc 2 is a hollow structure, including: a floating disc adsorption unit 201 and a floating disc moving unit 202. The lower bottom surface of the floating disc adsorption unit 201 is adsorbed on the fuel surface, and the lower end of the floating disc moving unit 202 is slidably inserted into the floating disc adsorption unit 201 from the upper end of the floating disc adsorption unit 201, so that the floating disc moving unit 202 can move up and down relative to the floating disc adsorption unit 201 in the vertical direction. The lower bottom surface of the floating disc adsorption unit 201 is adsorbed by the fuel, so that the floating disc moving unit 202 can always keep in contact with the top surface of the fuel when moving upward; the up and down movement of the floating disc moving unit 202 relative to the floating disc adsorption unit 201 can adjust the relative height of the top surface of the floating disc relative to the fuel surface during the experiment to simulate the relationship between the flame merger and the fuel boiling time of the floating disc structures at different heights and the sealing ring during a fire in an external floating roof tank.

[0042] Specifically, the floating disk adsorption unit 201 is a barrel-shaped structure with an open upper end. The open upper end extends radially inward to form an inner annular ear plate. A plurality of vertically arranged chutes 231 evenly distributed in the circumferential direction are provided on the inner side wall of the barrel-shaped structure. The floating disk moving unit 202 is a barrel-shaped structure with an open lower end. The open lower end extends radially outward to form an outer annular ear plate. A plurality of vertically arranged sliders evenly distributed in the circumferential direction are provided on the outer side wall of the outer annular ear plate. The plurality of vertically arranged sliders are correspondingly and slidably inserted into the plurality of vertically arranged chutes 231. The vertically arranged sliders slide in the vertically arranged chutes 231 in the vertical direction, thereby changing the relative height between the top surface of the floating disk moving unit 202 and the top surface of the fuel.

[0043] Herein, the inner side wall of the inner annular ear plate is adapted to the outer side wall of the floating disk moving unit 202, and the outer side wall of the outer annular ear plate is adapted to the inner side wall of the floating disk adsorption unit 201. Therefore, the inner annular ear plate, the outer annular ear plate, the inner side wall of the floating disk adsorption unit 201, and the outer side wall of the floating disk moving unit 202 form an annular cavity. A plurality of pressure balance holes 241 are formed in the inner annular ear plate starting from its top surface in the vertical direction. The plurality of pressure balance holes 241 communicate with the annular cavity, so that the air pressure in the annular cavity is kept balanced with the external air pressure during the up and down movement of the floating disk moving unit 202 relative to the floating disk adsorption unit 201. Further, the pressure balance holes 241 are formed opposite to the vertically arranged chutes 231. On the one hand, it is convenient for the gas flow inside and outside the annular cavity. At the same time, grease can be injected into the annular chute through the pressure balance holes 241 to lubricate the relative sliding between the vertically arranged sliders and the vertically arranged chutes 231, and reduce the sliding friction between the floating disk moving unit 202 and the floating disk fixing unit during the relative movement.

[0044] In this embodiment, the floating disk adsorption unit 201 includes an adsorption bottom cover 221 and an adsorption cylinder 211. Among them, the adsorption cylinder 211 is a cylindrical structure with two open ends. The upper open end of the adsorption cylinder 211 extends radially inward to form an inner annular ear plate. A plurality of vertically arranged chutes 231 are provided on the inner side wall of the adsorption cylinder 211. The lower open end of the adsorption cylinder 211 is tightly fitted with the adsorption bottom cover 221. Specifically, the lower end of the adsorption cylinder 211 is threadedly connected to the adsorption bottom cover 221. During the installation process, the adsorption moving unit is inserted through the lower open end of the adsorption cylinder 211 and extends out through the upper open end of the adsorption cylinder 211. Then, the adsorption bottom cover 221 is threadedly tightened with the lower end of the adsorption cylinder 211.

[0045] In this embodiment, the vertical movement of the floating disc moving unit 202 relative to the floating disc fixing unit is driven by a lifting drive unit 5 (such as an air pump or an electric push rod, etc.). Specifically, an installation through hole 251 is formed in the middle of the bottom plate of the barrel structure of the test tank body 1; the lifting drive unit 5 is located at the lower part of the test tank body 1, and the telescopic part of the lifting drive unit 5 can move up and down along the axis of the installation through hole 251. Furthermore, the height of the floating disc moving unit 202 relative to the floating disc fixing unit is adjusted by the up and down movement of the telescopic part.

[0046] In a specific example, a guiding and sealing column 3 coaxial with the installation through hole 251 is arranged in the test tank body 1; wherein, the guiding and sealing column is a cylindrical structure with openings at both ends. The lower end of the guiding and sealing column 3 is detachably and penetratively connected to the bottom of the barrel structure of the test tank body 1, and the upper end penetrates through the bottom of the barrel structure of the floating disc adsorption unit 201 and extends into the barrel structure of the floating disc adsorption unit 201. Specifically, the lower end of the guiding and sealing column 3 is in tight fit with the installation through hole 251, and the upper end of the guiding and sealing column 3 extends into the hollow structure of the liftable floating disc 2 after passing through the surface of the liftable floating disc 2 in contact with the fuel; the telescopic part of the lifting drive unit 5 extends into the guiding and sealing column 3 from the lower end, and after extending out from the upper end of the cylindrical structure of the guiding and sealing column 3, it is connected to the floating disc moving unit 202 of the liftable floating disc 2. Furthermore, the telescopic part of the lifting drive unit 5 moves circumferentially and telescopically in the guiding and sealing column 3, driving the floating disc moving unit 202 to move up and down relative to the floating disc adsorption unit 201.

[0047] In this embodiment, an installation counterbore coaxial with the installation through hole 251 is provided on the bottom plate of the test tank body 1. Correspondingly, an installation boss is provided on the outer side wall of the guiding and sealing column 3 near the lower end, and the installation boss is in tight fit with the installation counterbore (such as, threaded connection, etc.); the section of the guiding and sealing column 3 cooperating with the installation through hole 251 can be in tight fit or clearance fit.

[0048] In another specific example, an adjusting push rod 4 is also coaxially and slidably sleeved in the cylindrical structure of the guiding and sealing column 3. The upper end of the adjusting push rod 4 passes through the upper end of the guiding and sealing column 3 and is detachably connected to the bottom plate of the barrel structure of the floating disc moving unit 202. That is to say, after the upper end of the adjusting push rod 4 passes through the upper end of the cylindrical structure of the guiding and sealing column 3, it is detachably connected to the bottom plate of the floating disc moving unit 202 (such as, threaded connection). The lower end of the adjusting push rod 4 is connected to the telescopic part of the telescopic drive unit. Thereby, under the drive of the telescopic drive unit, the adjusting push rod 4 is driven to telescopically move in the guiding and sealing column 3, and the height of the top surface of the floating disc moving unit 202 relative to the top surface of the fuel is adjusted in real time and automatically.

[0049] During the installation process, first thread the guiding and sealing column 3 into the installation counterbore, or tightly fit the guiding and sealing column 3 with the installation through hole 251 to firmly connect the guiding and sealing column 3 with the test tank body 1. At the same time, after connecting the upper end of the adjusting push rod 4 with the floating disk moving unit 202, the whole is inserted from the lower end of the adsorption cylinder body 211 so that the vertical slide rail matches the vertical chute 231. Finally, connect the adsorption bottom cover 221 with the adsorption cylinder body 211. After completing the connection between the liftable floating disk 2 and the adjusting push rod 4, insert the assembly of the liftable floating disk 2 and the adjusting push rod 4 downward from the upper end of the guiding and sealing column 3. After passing through the lower end opening of the guiding and sealing column 3, connect it with the telescopic part of the telescopic driving unit.

[0050] Here, it should be noted that a gap can be left between the guiding and sealing column 3 and the adjusting push rod 4, that is, the inner diameter of the cylindrical structure of the guiding and sealing column 3 is larger than the outer diameter of the adjusting push rod 4, so that the hollow structure of the liftable floating disk 2 is connected to the outside of the test tank body 1, making the air pressure in the hollow structure of the liftable floating disk 2 balanced with the outside air pressure of the test tank body 1 to facilitate the up and down movement of the floating disk moving unit 202. In addition, a plurality of ventilation holes 212 communicating with the hollow structure can be opened on the top plate of the floating disk moving unit 202 to allow the internal air flow of the hollow structure to communicate with the air flow above the floating disk moving unit 202. Furthermore, through the gap between the guiding and sealing column 3 and the adjusting push rod 4, the air flow above the floating disk moving unit 202 is communicated with the air flow below the test tank body 1, so as to increase the air entrainment above the floating disk moving unit 202 during fuel combustion and delay the occurrence of flame coalescence in the early stage of combustion.

[0051] In another specific example, an air flow through hole 222 is provided on the bottom plate of the barrel-shaped structure of the floating disk moving unit 202, and an air flow channel 401 is provided on the adjusting push rod 4. The upper end of the air flow channel 401 is communicated with the air flow through hole 222, and the lower end of the air flow channel 401 is located outside the bottom plate of the barrel-shaped structure of the test tank body 1. Specifically, the air flow through hole 222 is axially opened on the bottom plate of the floating disk moving unit 202; an axial channel (not penetrating the bottom surface of the adjusting push rod 4) is axially opened downward from the top surface on the adjusting push rod 4, and a radial channel is opened on the outer side wall of the bottom surface of the adjusting push rod 4 extending out of the test tank body 1. The radial channel is communicated with the axial channel to form the air flow channel 401. In addition, a plurality of threaded blind holes are provided on the lower end surface of the adjusting push rod 4 in the vertical direction, and the adjusting push rod 4 is connected with the telescopic part of the telescopic driving unit by screws.

[0052] After adjusting the connection between the adjusting push rod 4 and the floating disc moving unit 202, the air flow channel 401 on the adjusting push rod 4 communicates with the air flow through hole 222 on the floating disc moving unit 202, enabling the air flow above the floating disc moving unit 202 to communicate with the air flow below the test tank body 1, further enhancing the air entrainment above the floating disc moving unit 202 during fuel combustion and delaying the occurrence of flame merger in the early stage of combustion.

[0053] Meanwhile, a gas valve can also be arranged at the radial channel outlet of the adjusting push rod 4 to control the on-off of the air flow above the floating disc moving unit 202 and the air flow below the test tank body 1 through the opening and closing of the gas valve. During fuel combustion, if the flame converges towards the center (i.e., flame merger) occurs, the gas valve can be opened to enable the air flow above the floating disc moving unit 202 to communicate with the air flow below the test tank body 1, enhancing the air entrainment above the floating disc moving unit 202 during fuel combustion and delaying the occurrence of flame merger in the early stage of combustion, so as to facilitate the analysis of fire laws such as the air entrainment rate, the mass change rate of fuel, and the flame merger probability during the combustion process. In addition, the gas valve can be closed to block the air flow above the floating disc moving unit 202 from communicating with the air flow below the test tank body 1, pushing the floating disc moving unit 202 to rise, and further realizing the law of the stable combustion period of fuel at different floating disc heights.

[0054] In another specific example, a limiting groove is also arranged on the side wall of the adjusting push rod 4, and an elastic limiting member 6 is installed in the limiting groove. The elastic limiting member 6 is located between the lower end of the air flow channel 401 and the bottom plate of the barrel structure of the test tank body 1. The radial dimension of the elastic limiting member 6 is larger than the radial dimension of the mounting through hole 251, and the upward travel of the adjusting push rod 4 is less than or equal to the relative movement travel between the floating disc moving unit 202 and the floating disc adsorption unit 201. Furthermore, the upward travel of the adjusting push rod 4 is limited by the elastic limiting member 6, effectively avoiding the collision between the floating disc moving unit 202 and the floating disc adsorption unit 201 during the upward movement process, and at the same time, effectively avoiding driving the floating disc adsorption unit 201 to separate from the fuel liquid level, further ensuring the accuracy of the experiment.

[0055] During the experiment, after flame merger occurs during fuel combustion, there will be a period of stable combustion stage, that is, the stable period. Subsequently, the combustion rate increases sharply, and the combustion reaches the overall boiling stage. Through the opening and closing of the gas valve and the height adjustment of the liftable floating disc 2, the analysis of combustion laws such as different floating disc heights, air entrainment rate, fuel mass change rate, flame merger probability, and combustion stable period during the fuel combustion process is realized.

[0056] In a specific application scenario, different fuels are used to conduct experiments to obtain fire information and determine whether flame merging occurs in the early stage of combustion; if so, the gas valve is opened; if flame merging does not occur, the relationship between air entrainment rate, different combustion heat release rates, flame merging probability, etc. is established based on the fire data; after opening the gas valve, it is determined whether flame merging will occur at the same time. If so, the gas valve is closed to drive the floating plate activity unit to move, and the duration of the stable period of combustion at different floating plate heights is compared, and the relationship between the air volume in the hollow structure of the lifting floating plate, the floating plate heat conduction, the duration of the stable period, etc. is analyzed. In addition, the air entrainment rate, the mass change rate of the fuel, the flame merging, the duration of the stable period, etc. at different floating plate heights can also be analyzed.

[0057] In this scenario, during the preliminary preparation stage of the experiment, two different fuels, n-heptane and anhydrous ethanol, were used, and the combustion area was A. f =0.0325m 2 , the ratio of inner diameter to outer diameter η is 0.609, 0.732, 0.787, 0.830, 0.877, and five floating disk annular oil tanks (target oil tanks) TrayA, TrayB, TrayC, TrayD, and TrayE. In the simulation experimental device, the lifting float is made of titanium alloy with an adjustment stroke of 50mm; the experimental tank body is made of stainless steel with a height of 100mm; the fireproof board is 10mm thick; the thermocouple is a K-type armored thermocouple with a diameter of 1mm; four weighing sensors are arranged on the fireproof board, one image acquisition device is located at the edge of the test oil tank of the simulation experimental device, and the other image acquisition device is at a 45-degree angle to the ground to shoot down to record the flame fireworks process during the experiment. At the same time, according to the public experiment, the sealing ring fire simulation was carried out on 5 floating disk annular oil tanks with different inner and outer diameter ratios using two different fuels, n-heptane and anhydrous ethanol, and the initial thick layer thickness of the fuel was 30mm.

[0058] Specifically, Figures 10 to 12 As shown, the consequence analysis method for reducing the sealing ring fire accident provided in the embodiment of the present application uses the simulation experimental device for reducing the sealing ring fire accident of any of the above embodiments to simulate the sealing ring fire of the target oil tank, and the method includes:

[0059] Step S101: determining the flame merging probability of a target oil tank when a sealing ring fire occurs based on the mass change rate of the experimental device during the experiment and the constructed flame merging probability model.

[0060] During the experiment, an ethanol-free floating disk pool fire experiment was conducted. Among the five floating disk annular oil tanks (target oil tanks) TrayA, TrayB, TrayC, TrayD, and TrayE, flame convergence towards the center occurred in TrayA, TrayB, and TrayC, and the gas valves of the corresponding target oil tanks were opened; subsequently, flame coalescence occurred in TrayA, while no flame coalescence occurred in oil tanks TrayB, TrayC, TrayD, and TrayE. For oil tanks TrayB, TrayC, TrayD, and TrayE, the relationships between the air entrainment rate, the mass change rate of the fuel, and the law of flame coalescence were analyzed; after flame coalescence occurred in oil tank TrayA, the gas valve was closed, and the height of the liftable floating disk was adjusted. The flame coalescence in oil tank TrayA disappeared, that is, there would be no steady state period in the transition stage of oil tank TrayA. Therefore, there would be no sudden increase in flame height when oil tank TrayA reached the overall boiling stage.

[0061] Step S102: Based on the pre-constructed duration model, determine the dimensionless duration of the steady state period when a seal ring fire occurs in the target oil tank according to the height of the liftable floating disk of the experimental device during the experiment, the mass change rate of the experimental device during the experiment, and the flame temperature and fuel temperature when a seal ring fire occurs in the target oil tank.

[0062] A heptane floating disk pool fire experiment was conducted. Among the five floating disk annular oil tanks (target oil tanks) TrayA, TrayB, TrayC, TrayD, and TrayE, flame convergence towards the center occurred in all five oil tanks; after the gas valves of the target oil tanks were opened, flame coalescence occurred in all five oil tanks; the gas valves were closed, and the height of the liftable floating disk was adjusted. Subsequently, the flame coalescence in oil tanks TrayA and TrayB disappeared, while the flames in oil tanks TrayC, TrayD, and TrayE remained in a coalesced state. Therefore, for oil tanks TrayC, TrayD, and TrayE, the steady state period durations at different floating disk heights were compared, and the relationships between the internal air volume of the hollow structure of the liftable floating disk, the floating disk heat transfer coefficient, the ratio η of the different inner and outer diameters of the target oil tank, and the steady state period duration at different floating disk heights were analyzed.

[0063] From the model of the dimensionless duration of the stable period when the seal ring fire occurs in the target oil tank, it can be seen that when the ratio of the inner diameter to the outer diameter of the target oil tank is the same, η, the height of the liftable floating plate is not adjusted, the air volume in the hollow structure of the liftable floating plate is small, and the overall heat conduction of the liftable floating plate is large, resulting in a shorter duration of the stable period. Therefore, the height of the liftable floating plate is controlled and adjusted to increase the air volume of the hollow structure in the liftable floating plate, slow down the overall conduction heat feedback of the liftable floating plate, effectively prolong the duration of the stable period in the combustion transition stage, and delay the time for the combustion to reach overall boiling, even if the time for the fire to increase is delayed. Furthermore, by correspondingly raising the height of the floating plate structure of the target oil tank, more time can be gained for fire rescue and personnel evacuation.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0068] The foregoing are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A simulation experimental device for reducing fire accidents of sealing rings, characterized in that: Used to simulate the seal fire of the target tank containing fuel, including: The test tank body is a barrel structure with an upper opening, and the test tank body contains fuel; A liftable floating plate is located in the barrel structure of the test tank body, the lower bottom surface is adsorbed on the fuel surface, and an annular gap is left between the floating plate and the inner wall of the barrel structure of the test tank body; wherein the height of the liftable floating plate can be adjusted in the vertical direction, comprising: a floating plate adsorption unit and a floating plate movable unit, the floating plate adsorption unit is a barrel structure with an opening at the upper end, and an inner annular ear plate extends radially inward from the upper end opening, a plurality of vertical slide grooves uniformly distributed along the circumferential direction are arranged on the inner side wall, and a plurality of pressure balancing holes are opened on the top surface; the floating plate movable unit is a barrel structure with an opening at the lower end, and the lower bottom surface is adsorbed on the fuel surface, an outer annular ear plate extends radially outward from the lower end opening, and a plurality of vertical sliding blocks uniformly distributed along the circumferential direction are arranged on the outer side wall of the outer annular ear plate; The plurality of vertical sliders are correspondingly slidably inserted into the plurality of vertical slide grooves, and the inner annular ear plate, the outer annular ear plate, the inner wall of the floating plate adsorption unit, and the outer wall of the floating plate movable unit form an annular cavity; the pressure balance hole is connected to the annular cavity.

2. The simulation experimental device for reducing seal ring fire accidents according to claim 1 is characterized in that: The floating plate movable unit is slidably inserted into the floating plate adsorption unit at its lower end, and can move up and down relative to the floating plate adsorption unit in a vertical direction.

3. The simulation experimental device for reducing seal ring fire accidents according to claim 1 is characterized in that: Also includes: Guide sealing column and adjustment push rod; The guide sealing column is a cylindrical structure with two ends opened, the lower end of which is detachably penetrated through the bottom of the barrel structure connected to the test tank body, and the upper end of which penetrates through the bottom of the barrel structure of the floating plate adsorption unit and extends into the barrel structure of the floating plate adsorption unit; An adjusting push rod is slidably sleeved in the cylindrical structure of the guide sealing column, the upper end of which is detachably connected to the bottom plate of the barrel structure of the floating plate movable unit, and the lower end of which is connected to a telescopic driving unit; and the adjusting push rod is also provided with an air flow channel, the upper end of which is communicated with an air flow hole provided on the bottom plate of the barrel structure of the floating plate movable unit, and the lower end of which is located on the outer side of the bottom plate of the barrel structure of the test tank body; Wherein, the telescopic driving unit is used to drive the adjusting push rod to move up and down in the vertical direction.

4. The simulation experimental device for reducing seal ring fire accidents according to claim 3 is characterized in that: A limiting groove is also provided on the side wall of the adjusting push rod, an elastic limiting member is installed in the limiting groove, and the limiting groove is located between the lower end of the air flow channel and the bottom plate of the barrel structure of the test tank body.

5. The simulation experimental device for reducing seal ring fire accidents according to claim 1 is characterized in that: The liftable floating plate is made of titanium alloy.

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