A device and method for evaluating the fluidity and thermal stability of foam under radiation

Abstract

The present invention discloses a device and method for evaluating the fluidity and thermal stability of foam under radiation, which mainly include: a containing system, a radiation system, a supply system, a nitrogen fire protection system, a monitoring system, and an intelligent control system. The containing system contains oil products and foam and provides a closed environment; the radiation system generates radiation, acts on the oil layer and the foam layer, and simulates the actual fire radiation scene; the supply system is used to supply oil products and foam; the nitrogen fire protection system is used to exhaust the oxygen inside the containing system to prevent combustion; the monitoring system monitors and records parameters such as the foam movement state, destruction process, and radiation intensity in real time; the intelligent control system intelligently controls oil injection, nitrogen injection, foam injection, radiation intensity adjustment, etc., to realize the movement and diffusion of foam at different evaporation rates on the oil surface and the destruction simulation under different radiation intensities. The device of the present invention can realize the comprehensive test of foam fluidity and thermal stability under different radiation environments, and provide guidance for the research and development of fire extinguishing agents.

Description

Technical Field

[0001] The invention belongs to the technical field of foam performance testing devices, and specifically relates to a device and method for evaluating the fluidity and thermal stability of foam under radiation. Background Art

[0002] With the rapid development of my country's economy and the improvement of people's living standards, the demand for oil products has increased year by year. Storage tanks are widely used in liquid fuel storage due to their high safety and low maintenance costs. At present, there are about 35,000 petroleum and petrochemical storage tanks in China, with a total tank capacity of about 350 million cubic meters. However, in recent years, storage tank fire and explosion accidents have occurred frequently, causing heavy casualties and property losses, seriously threatening my country's economic development and social stability.

[0003] Foam fire extinguishing agent is the most commonly used and most effective fire extinguishing agent product for fighting liquid fires. Foam fire extinguishing agent achieves fire extinguishing through multiple functions such as covering, isolating and cooling. Therefore, parameters such as the fluidity and stability of the foam fire extinguishing agent directly affect the fire extinguishing efficiency of the foam fire extinguishing agent. In the actual tank fire scene, when the distance from the oil surface to the tank top is large, the flame will break away from the oil surface, forming a downward flame combustion, and there is a certain distance between the flame root and the oil surface. At this time, the foam fire extinguishing agent covering the surface of the high-speed evaporating oil will be affected by the downward flame radiation and the floating of the oil vapor, which puts higher requirements on the performance of the foam fire extinguishing agent.

[0004] At present, some scholars have conducted relevant research on foam fire extinguishing agent performance testing devices. Authorization Announcement No. CN116399896A discloses a foam fluid thermal stability testing device and method, which tests the influence of thermal radiation and smoke scenes on foam fire extinguishing performance and other parameters by setting up a thermal radiation module and a high-temperature smoke generation module. Authorization Announcement No. CN117571768B discloses a convection and radiation coupled foam thermal stability testing and re-ignition device, which studies the thermal stability of foam fire extinguishing agents in complex heating scenes coupled with thermal convection and thermal radiation by setting up a radiation module and a convection module. Authorization Announcement No. CN112098602B discloses a high-temperature and high-pressure foam evaluation device and evaluation method, which realizes accurate evaluation of important parameters such as foam half-life and liquid separation half-life by separating the foam generation area and the observation area and staggering the observation window. Authorization announcement number CN209542400U discloses a foam performance detection device, which is based on the principle that the liquid phase in the foam is conductive while the gas phase is non-conductive, and monitors the foam stability in real time by measuring the change in conductivity in the foam extinguishing agent. Authorization announcement number CN220525758U discloses a foam performance detector, which automatically detects and records basic parameters such as foaming ability and liquid separation half-life under different temperature conditions by setting infrared sensors, timers, single-chip microcomputers, liquid level meters, etc.

[0005] Through the investigation and analysis of existing technologies, it can be seen that the existing foam fire extinguishing agent performance test devices mainly focus on basic parameters such as foaming ability and half-life of foam fire extinguishing agents and stability tests under thermal convection and thermal radiation coupling scenarios, while there are few test devices for the effects of high-speed oil evaporation and radiation coupling on foam performance. Therefore, it is necessary to develop a device to evaluate the fluidity and thermal stability of foam under radiation. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the technical field of existing foam performance testing devices. To this end, the present invention proposes a device for evaluating the fluidity and thermal stability of foam under radiation, which can simultaneously complete the comprehensive performance test of foam fire extinguishing agents under different radiation intensities and oil evaporation rates.

[0007] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation comprises: a containing system, which contains oil and foam and provides a closed environment; a radiation system, which generates radiation to act on the oil layer and the foam layer to simulate an actual fire radiation scene; a supply system, which is used to supply oil and foam to the containing system to form oil layers and foam layers of different thicknesses in the containing system; a nitrogen fire protection system, which is used to exhaust oxygen inside the containing system to prevent combustion; a recovery system, which is used to recover oil vapor generated under radiation; a monitoring system, which is used to monitor the foam flow state and destruction process during the test of the device for evaluating the fluidity and thermal stability of foam under radiation, and the monitoring system is also used to monitor the radiation intensity, gas concentration and temperature inside the containing system; an intelligent control system, which is used to control the operating state of each system of the device for evaluating the fluidity and thermal stability of foam under radiation and record operating data.

[0008] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation is provided, wherein the containing system includes a containing container, a glass cover, an exhaust hole, an air injection hole, and a liquid drainage hole. The containing container is used to carry oil and foam. The containing container should be rectangular and at least one side should be glass, so as to facilitate observation of the flow state and the destruction state of the foam; the glass cover is infrared-transmissive glass, located on the upper part of the containing container, and forms a closed space with the containing container to prevent the gas inside the closed space from being directly discharged into the atmosphere; holes are evenly opened on the upper side of the glass cover to form exhaust holes, so as to facilitate the discharge of air and oil vapor under radiation; the air injection hole is used to inject nitrogen to form an environment that does not support combustion; the liquid drainage hole is used to discharge excess liquid after the test.

[0009] Optionally, the specific dimensions of the container and the glass cover are determined according to actual test requirements and are not specifically limited here.

[0010] Advantageously, the connection position between the containing container and the glass cover, the connection with other systems and the opening position of the system itself should be sealed to ensure the sealing of the system.

[0011] Advantageously, scales may be provided in the horizontal and vertical directions on the observation side of the container to facilitate calculation of foam thickness and flow length.

[0012] Advantageously, the gas injection hole, the gas exhaust hole and the liquid drain hole should be filled with high temperature resistant sealing materials to prevent the oxygen concentration inside the containing system from being difficult to drop to a concentration that does not support combustion.

[0013] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation, the radiation system includes a radiation plate, a motion bracket, and a radiation controller. The radiation plate is located on the upper part of the containing system, and is used to perform radiation heating on the inside of the containing system, simulating the radiation effect of oil and foam in an actual fire scene; the motion bracket is used to support the radiation plate and control the up and down movement of the radiation plate to adjust the radiation size; the radiation controller is used to control the power size of the radiation plate, and then control the radiation size to simulate different fire scenes.

[0014] Advantageously, the size of the radiation plate should be consistent with the size of the container system, and the radiation plate should be kept parallel to the glass cover to ensure that the radiation intensity at each position inside the container is consistent.

[0015] Advantageously, a limiter should be installed on the moving bracket to prevent the radiation panel from descending to a low height, thereby causing the radiation panel to collide with the containing system, thereby causing damage to the equipment.

[0016] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation, the supply system includes an oil product including an oil storage tank, an oil delivery pump, an oil delivery pipeline, an oil product mass flow meter, a liquid valve, a foam generator, a foam delivery pipe, a foam flow meter, and a foam valve. The oil storage tank is used to store oil products; the oil delivery pump is used to pump the oil products in the oil storage tank into the container; one end of the oil delivery pipeline is connected to the container, and the other end is connected to the oil storage tank, the oil delivery pump, the oil product mass flow meter and the liquid valve to supply oil products to the container; the oil product mass flow meter is used for precise control of the oil product flow; the liquid valve is used to control the opening and closing of the oil delivery pipeline; the foam generator is used to generate foam; one end of the foam delivery pipe is connected to the container, and the other end is connected to the foam generator, the foam flow meter and the foam valve to supply foam to the container; the foam flow meter is used for precise control of the foam flow; the foam valve is used to control the opening and closing of the foam delivery pipe.

[0017] Optionally, the liquid valve and the foam valve may be solenoid valves, which may be directly controlled by an intelligent control system.

[0018] Advantageously, a scale may be provided on the upper portion of the oil storage tank, thereby facilitating calculation and verification of the thickness of the oil inside the container.

[0019] Optionally, the oil type can be determined according to actual foam fire extinguishing agent testing requirements, and is not specifically limited here.

[0020] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation, the nitrogen fire protection system includes a nitrogen bottle, a ventilation hose, a pressure reducing valve, a gas valve, and a gas flow meter. The nitrogen fire protection system is provided with nitrogen by the nitrogen bottle, and nitrogen is provided to the containing system through the ventilation hose, the pressure reducing valve, the gas valve, the gas flow meter, etc., to exhaust the air in the containing system, to prevent the oil layer from catching fire when the radiation system is acting, to generate a convection environment, and to interfere with the size of the radiation; the pressure reducing valve is used to reduce the high-pressure nitrogen in the nitrogen bottle to a stable and controllable low-pressure nitrogen; the gas valve is used to control the opening and closing of the ventilation hose; the gas flow meter is used to accurately control the nitrogen flow rate.

[0021] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation, the recovery system includes a recovery pipe, a cooling device, an exhaust gas discharge hole, an oil recovery tank, and a steam recovery valve. One end of the recovery pipe is connected to the exhaust hole on the upper side of the glass cover of the containing system, and the other end is connected to the cooling device, the exhaust gas discharge hole, and the oil recovery tank, and is used to recover the oil vapor generated under radiation; the cooling device is used to cool the high-temperature oil vapor generated under radiation; the exhaust gas discharge hole is used to discharge excess nitrogen; and the oil recovery tank is used to contain the high-temperature oil cooled by the cooling device.

[0022] Optionally, the recovery pipe should be made of high temperature resistant material to avoid damage due to high temperature.

[0023] Advantageously, the diameter of the recovery pipe should be as small as possible to avoid excessive deviations of the radiation inside the containment system.

[0024] Advantageously, the recovery tank should be provided with a scale to facilitate calculation of the evaporation rate of the oil product.

[0025] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation, the monitoring system includes a video monitoring device, a radiation intensity monitoring device, a gas concentration monitoring device and a temperature monitoring device. The video monitoring device is used to capture the movement process of the foam in the containing system at different oil evaporation rates and the destruction process under different radiation effects; the radiation intensity monitoring device is used to monitor the radiation intensity inside the containing system, and is used to evaluate the degree of foam destruction under different radiation intensities; the gas concentration monitoring device is mainly used to monitor the oxygen concentration inside the containing system to avoid combustion of oil under radiation; the temperature monitoring device is used to monitor the temperature changes of the foam layer, oil layer and gas space in the containing system.

[0026] Optionally, the video monitoring device may be an infrared camera, a wide dynamic camera, a high-speed camera or other video monitoring equipment, which may be selected according to environmental conditions and actual test needs, and is not specifically limited here.

[0027] Optionally, the radiation intensity monitoring device may be a radiation intensity monitoring device such as a heat flux meter or a thermal radiation meter, which may be selected according to actual needs and is not specifically limited here.

[0028] Optionally, the temperature monitoring device may be a temperature monitoring device such as a K-type thermocouple, an infrared temperature sensor, etc., which may be selected according to actual needs and is not specifically limited here.

[0029] Advantageously, the radiation intensity monitoring device should be installed at a position slightly higher than the oil level so as to accurately reflect the radiation intensity at the surface of the oil.

[0030] According to an embodiment of the present invention, a device for evaluating the fluidity and thermal stability of foam under radiation, the intelligent control system includes an intelligent control device and a data recording device, the intelligent control device controls the radiation intensity of the radiation system, thereby simulating different fire scenes; the intelligent control device can also control the operating state of the supply system, thereby intelligently controlling the oil layer thickness and foam volume inside the containing system; the intelligent control device can also control the operating state of the nitrogen fire protection system; the intelligent control device can also control the start and stop of the recovery system, thereby recovering the high-temperature oil vapor inside the containing system; the intelligent control device can also control the start and stop of the monitoring system, thereby controlling the operating state of other systems according to the monitoring situation; the data recording device can record the operating data of the intelligent control device and other systems in real time.

[0031] A method for evaluating foam fluidity and thermal stability under radiation according to an embodiment of the present invention comprises the following steps:

[0032] Step S1: Start the monitoring system; Step S2: Start the nitrogen fire protection system; Step S3: After the monitoring system detects that the oxygen concentration has dropped to a concentration that does not support combustion, start the oil supply module in the supply system to supply oil to the containing system to form an oil layer of a certain thickness; Step S4: Start the radiation system to heat the oil layer in the containing system to simulate the evaporation process of the oil under different radiation effects, and start the recovery system to recover the high-temperature oil vapor under the radiation effect; Step S5: Start the foam generation module in the supply system to supply foam to the containing system to simulate the diffusion process of the foam on the surface of the high-temperature oil and in the radiation environment, and the monitoring system records the foam movement process in real time; Step S6: When the foam completely covers the surface of the oil and forms a certain thickness, the supply system stops running, and the monitoring system records the foam destruction process in real time; Step S7: When the foam is completely destroyed, record the foam destruction time, and turn off the radiation system, monitoring system, etc.; Step S8: Clean the contaminated systems, repeat S1 to S7, and conduct the next test.

[0033] Additional aspects and advantages of the invention will become apparent from the following description, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 The figure is a schematic diagram of the overall structure of a device for evaluating the fluidity and thermal stability of foam under radiation according to an embodiment of the present invention.

[0036] Figure 2The figure is a schematic diagram of the positions of the radiation panel and the moving bracket according to an embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the position of the glass cover and the recycling system according to an embodiment of the present invention.

[0038] Reference numerals:

[0039] A device for evaluating the fluidity and thermal stability of foam under radiation 1000,

[0040] The containing system 100, the containing container 110, the glass cover 120, the exhaust hole 130, the air injection hole 140, and the liquid discharge hole 150

[0041] Radiation system 200, radiation panel 210, motion bracket 220, radiation controller 230,

[0042] Supply system 300, oil storage tank 310, oil delivery pump 320, oil pipeline 330, oil mass flow meter 340, liquid valve 350, foam generator 360, foam delivery pipe 370, foam flow meter 380, foam valve 390,

[0043] Nitrogen fire protection system 400, nitrogen cylinder 410, ventilation hose 420, pressure reducing valve 430, gas valve 440, gas flow meter 450,

[0044] Recovery system 500, recovery pipeline 510, cooling device 520, tail gas discharge hole 530, oil recovery tank 540, steam recovery valve 550,

[0045] Monitoring system 600, video monitoring device 610, radiation intensity monitoring device 620, gas concentration monitoring device 630, temperature monitoring device 640,

[0046] Intelligent control system 700 , intelligent control device 710 , and data recording device 720 . DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] A device for evaluating the fluidity and thermal stability of foam under radiation according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0050] According to an embodiment of the present invention, a device 1000 for evaluating the fluidity and thermal stability of foam under radiation is provided. Figure 1 As shown, it includes a containing system 100 , a radiation system 200 , a supply system 300 , a nitrogen fire protection system 400 , a recovery system 500 , a monitoring system 600 , and an intelligent control system 700 .

[0051] Among them, Figure 1 As shown, the container system 100 is composed of a container 110, a glass cover 120, an exhaust hole 130, an air injection hole 140, and a liquid discharge hole 150. The container 110 is rectangular, and one side is transparent and heat-resistant glass, which is used to contain water and foam; the glass cover 120 is infrared-transmissive glass, located on the upper part of the container 110, and forms a closed space with the container 110 to prevent the internal gas of the container system 100 from being directly discharged into the atmosphere; the upper side of the glass cover 120 is evenly opened to form an exhaust hole 130, which is convenient for exhausting air and oil vapor under radiation; the air injection hole 140 is used to inject nitrogen to form an environment that does not support combustion; the liquid discharge hole 150 is used to discharge excess liquid after the test.

[0052] Optionally, the specific dimensions of the container 110 and the glass cover 120 are determined according to actual test requirements and are not specifically limited here.

[0053] Advantageously, the connection position between the container 110 and the sealing glass cover 120 , the connection with other systems and the opening position of the system itself are sealed to ensure the sealing of the container system 100 .

[0054] Advantageously, scales are provided in the horizontal and vertical directions on the observation side of the container to facilitate calculation of the foam thickness and flow length.

[0055] Combination Figure 1 and Figure 2As shown, the radiation system 200 includes a radiation plate 210, a moving bracket 220, and a radiation controller 230. The radiation plate 210 is located on the upper part of the containing system 100, and is used to perform radiation heating on the inside of the containing system 100, simulating the radiation effect of the actual fire scene on the oil and foam; the moving bracket 220 is used to support the radiation plate 210, and control the radiation plate 210 to move up and down to adjust the radiation size; the radiation controller 230 is used to control the radiation power of the radiation plate 210, and then control the radiation size to simulate different fire scenes.

[0056] Advantageously, the radiation panel 210 is consistent in length and width with the containing system 100 and remains parallel to the containing system 100 during the up and down movement.

[0057] Advantageously, a limiter is installed on the moving bracket 220 to prevent the radiation panel 210 from descending too low and colliding with the containing system 100 or the recovery system 500, thereby causing damage to the device.

[0058] In some embodiments of the present invention, the radiation intensity of the radiation system 200 may be controlled to be 0 to test the flowability and stability of the foam without external interference.

[0059] like Figure 1 As shown, the supply system 300 includes an oil storage tank 310, an oil delivery pump 320, an oil delivery pipeline 330, an oil mass flow meter 340, a liquid valve 350, a foam generator 360, a foam delivery pipe 370, a foam flow meter 380, and a foam valve 390. The oil storage tank 310 is used to store oil products; the oil delivery pump 320 is used to pump the oil products in the oil storage tank 310 into the container 110; one end of the oil pipeline 330 is connected to the container 110, and the other end is connected to the oil storage tank 310, the oil delivery pump 320, the oil mass flowmeter 340 and the liquid valve 350, so as to supply oil products to the container 110; the oil mass flowmeter 340 is used for precise control of the oil flow; the liquid valve 350 is used to control the opening and closing of the oil pipeline 330; the foam generator 360 is used to generate foam; one end of the foam delivery pipe 370 is connected to the container 110, and the other end is connected to the foam generator 360, the foam flowmeter 380 and the foam valve 390, so as to supply foam to the container 110; the foam flowmeter 380 is used for precise control of the foam flow; the foam valve 390 is used to control the opening and closing of the foam delivery pipe 370.

[0060] Optionally, the liquid valve 350 and the foam valve 390 are solenoid valves, which can be directly controlled by the intelligent control system 700 .

[0061] Optionally, the oil storage tank 310 is provided with a scale to verify the amount of oil inside the container 110 .

[0062] Continue to refer to Figure 1 As shown, the nitrogen fire protection system 400 includes a nitrogen bottle 410, a ventilation hose 420, a pressure reducing valve 430, a gas valve 440 and a gas flow meter 450. The nitrogen bottle 410 is used for nitrogen supply, and nitrogen is provided to the container 110 through the ventilation hose 420, the nitrogen bottle 410, the pressure reducing valve 430, the gas valve 440, the gas flow meter 450 and the gas injection hole 140, and the air in the container 110 is discharged to prevent the oil layer from catching fire when the radiation system 200 is in action, and to generate a convection environment and interfere with the radiation size; the pressure reducing valve 430 is used to reduce the high-pressure nitrogen in the nitrogen bottle 410 to a stable and controllable low-pressure nitrogen; the gas valve 440 is used to control the opening and closing of the ventilation hose 420; and the gas flow meter 450 is used for precise control of the nitrogen flow rate.

[0063] Combination Figure 1 and Figure 3 As shown, the recovery system 500 includes a recovery pipe 510, a cooling device 520, an exhaust gas discharge hole 530, an oil recovery tank 540, and a steam recovery valve 550. One end of the recovery pipe 510 is connected to the exhaust hole 130 on the upper side of the glass cover 120, and the other end is connected to the cooling device 520, the exhaust gas discharge hole 530, the oil recovery tank 540, and the steam recovery valve 550, and is used to recover the oil vapor generated under the radiation effect; the cooling device 520 is used to cool the high-temperature oil vapor generated under the radiation effect; the exhaust gas discharge hole 530 is used to discharge excess nitrogen; and the oil recovery tank 540 is used to contain the high-temperature oil cooled by the cooling device 520.

[0064] Optionally, the recovery pipe 510 is made of corrosion-resistant metal material.

[0065] Advantageously, the recovery tank is provided with a scale to facilitate calculation of the evaporation rate of the oil product.

[0066] like Figure 1 As shown, the monitoring system 600 includes a video monitoring device 610, a radiation intensity monitoring device 620, a gas concentration monitoring device 630 and a temperature monitoring device 640. The video monitoring device 610 is used to shoot the movement process of the foam in the containing system 100 at different oil evaporation rates and the destruction process under different radiation effects; the radiation intensity monitoring device 620 is used to monitor the radiation intensity inside the containing system 100 and to evaluate the degree of foam destruction under different radiation intensities; the gas concentration monitoring device 630 is mainly used to monitor the oxygen concentration inside the containing system 100 to avoid oil combustion during radiation effects; the temperature monitoring device 640 is used to monitor the temperature changes of the foam layer, oil layer and gas space in the containing system 100.

[0067] Optionally, the video monitoring device 610 is a high-speed camera, which can be replaced with an infrared camera, a wide dynamic camera or other video monitoring equipment according to actual test needs.

[0068] Optionally, the radiation intensity monitoring device 620 is a heat flux meter, which can be replaced with a radiation intensity monitoring device such as a thermal radiation meter according to actual test needs.

[0069] Optionally, the temperature monitoring device 640 is a K-type thermocouple, which can be replaced with a temperature monitoring device such as an infrared temperature sensor according to actual test needs.

[0070] Advantageously, the radiation intensity monitoring device 620 is installed at a height slightly higher than the oil level.

[0071] Continue to refer to Figure 1 As shown, the intelligent control system 700 includes an intelligent control device 710 and a data recording device 720. The intelligent control device 710 simulates different fire scenes by controlling the radiation intensity of the radiation system 200; the intelligent control device 710 can also control the operation state of the supply system 300, thereby intelligently controlling the thickness of the oil layer and the amount of foam inside the container system 100; the intelligent control device 710 can also control the operation state of the nitrogen fire protection system 400; the intelligent control device 710 can also control the start and stop of the recovery system 500, thereby recovering the high-temperature oil vapor inside the container system 100; the intelligent control device 710 can also control the start and stop of the monitoring system 600, thereby controlling the operation state of other systems according to the monitoring situation; the data recording device 720 can record the operation data of the intelligent control device 710 and other systems in real time.

[0072] A method for evaluating foam fluidity and thermal stability under radiation according to an embodiment of the present invention comprises the following steps:

[0073] Step S1, start the monitoring system.

[0074] Step S2, start the nitrogen fire protection system, introduce nitrogen into the interior of the containing system, and exhaust the air inside the containing system.

[0075] Step S3: After the monitoring system detects that the oxygen concentration has dropped to a concentration that does not support combustion, the oil supply module in the supply system is started to supply oil to the containing system to form an oil layer of a certain thickness.

[0076] Step S4, start the radiation system to heat the oil layer in the containing system, simulate the evaporation process of the oil under different radiation effects, start the recovery system, and recover the high-temperature oil vapor under the radiation effect.

[0077] Step S5, start the foam generation module in the supply system to supply foam into the containing system, simulate the diffusion process of foam on the high-temperature oil surface and in the radiation environment, and the monitoring system records the foam movement process in real time.

[0078] Step S6: When the foam completely covers the surface of the oil product and forms a certain thickness, the supply system stops running and the monitoring system records the foam destruction process in real time.

[0079] Step S7: When all the foam is destroyed, record the foam destruction time and turn off the radiation system, monitoring system, etc.

[0080] Step S8: Clean each contaminated system, repeat S1 to S7, and proceed to the next test.

[0081] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] The device 1000 for simulating tank top damage forms under different explosion scenarios and the principle of combustion and explosion of combustible gas in the simulation method according to an embodiment of the present invention are well known to ordinary technicians in the field and will not be described in detail here.

[0083] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does 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.

[0084] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for evaluating the fluidity and thermal stability of foam under radiation, characterized in that: include: Packing system, radiation system, supply system, nitrogen fire protection system, recovery system, monitoring system, intelligent control system; The containing system comprises a containing container, a glass cover, an exhaust hole, an air injection hole and a liquid discharge hole. The containing container is used to carry oil and foam; the glass cover is located on the upper part of the containing container and forms a closed space with the containing container; holes are evenly opened on the upper side of the glass cover to form exhaust holes, which are convenient for exhausting air and oil vapor under radiation; the air injection hole is used to inject nitrogen to form an environment that does not support combustion; the liquid discharge hole is used to discharge excess liquid after testing; The radiation system includes a radiation plate, a motion bracket, and a radiation controller. The radiation plate is located on the upper part of the containing system and is used to perform radiation heating on the inside of the containing system to simulate the radiation effect on oil and foam in an actual fire scene. The motion bracket is used to support the radiation plate and control the up and down movement of the radiation plate to adjust the radiation size. The radiation controller is used to control the power of the radiation plate, thereby controlling the radiation size to simulate different fire scenes. A supply system, the supply system includes an oil storage tank, an oil delivery pump, an oil delivery pipeline, an oil mass flowmeter, a liquid valve, a foam generator, a foam delivery pipe, a foam flowmeter, and a foam valve. The oil storage tank is used to store oil; the oil delivery pump is used to pump the oil in the oil storage tank into the storage container; one end of the oil delivery pipeline is connected to the storage container, and the other end is connected to the oil storage tank, the oil delivery pump, the oil mass flowmeter and the liquid valve, so as to supply oil to the storage container; the oil mass flowmeter is used for precise control of oil flow; the liquid valve is used to control the opening and closing of the oil delivery pipeline; the foam generator is used to generate foam; one end of the foam delivery pipe is connected to the storage container, and the other end is connected to the foam generator, the foam flowmeter and the foam valve, so as to supply foam to the storage container; the foam flowmeter is used for precise control of foam flow; the foam valve is used to control the opening and closing of the foam delivery pipe; A nitrogen fire prevention system, comprising a nitrogen bottle, a ventilation hose, a pressure reducing valve, a gas valve, and a gas flow meter. The nitrogen fire prevention system is provided with nitrogen by the nitrogen bottle, and nitrogen is provided to the containing system through the ventilation hose, the pressure reducing valve, the gas valve, the gas flow meter, etc., to exhaust the air in the containing system, so as to prevent the oil layer from catching fire when the radiation system is in action, thereby generating a convection environment and interfering with the radiation size; the pressure reducing valve is used to reduce the high-pressure nitrogen in the nitrogen bottle to a stable and controllable low-pressure nitrogen; the gas valve is used to control the opening and closing of the ventilation hose; the gas flow meter is used to accurately control the nitrogen flow rate; A recovery system, the recovery system comprising a recovery pipeline, a cooling device, an exhaust gas discharge hole, an oil recovery tank, and a steam recovery valve; one end of the recovery pipeline is connected to the exhaust hole on the upper side of the glass cover of the containing system, and the other end is connected to the cooling device, the exhaust gas discharge hole, and the oil recovery tank, and is used to recover the oil vapor generated by radiation; the cooling device is used to cool the high-temperature oil vapor generated by radiation; the exhaust gas discharge hole is used to discharge excess nitrogen; the oil recovery tank is used to contain the high-temperature oil cooled by the cooling device; A monitoring system, the monitoring system is used to monitor the foam flow state and destruction process during the testing process of the device, and the monitoring system is also used to monitor the radiation intensity, gas concentration and temperature inside the containing system; An intelligent control system is used to control the operating status of each system of the device and record operating data.

2. The device for evaluating the fluidity and thermal stability of foam under radiation according to claim 1, characterized in that: The monitoring system includes a video monitoring device, a radiation intensity monitoring device, a gas concentration monitoring device and a temperature monitoring device. The video monitoring device is used to capture the movement process of the foam in the containing system at different oil evaporation rates and the destruction process under different radiation effects; the radiation intensity monitoring device is used to monitor the radiation intensity inside the containing system and to evaluate the degree of foam destruction under different radiation intensities; the gas concentration monitoring device is mainly used to monitor the oxygen concentration inside the containing system to avoid oil combustion under radiation effects; the temperature monitoring device is used to monitor the temperature changes of the foam layer, oil layer and gas space in the containing system.

3. The device for evaluating the fluidity and thermal stability of foam under radiation according to claim 1, characterized in that: The intelligent control system includes an intelligent control device and a data recording device. The intelligent control device controls the radiation system to generate different radiation intensities and simulate different fire scenes. The intelligent control device can also control the supply system to inject a certain thickness of oil layer and foam layer into the containing system. The intelligent control device can also control the nitrogen fire protection system to inject nitrogen into the containing system in time. The intelligent control device can also control the start and stop of the recovery system to recover the high-temperature oil vapor inside the containing system. The intelligent control device can also control the start and stop of the monitoring system to control the operation of other systems according to the monitoring situation. The data recording device can record the operation data of the intelligent control device and other systems in real time.

4. A method for evaluating the fluidity and thermal stability of foam under radiation, used in a device for evaluating the fluidity and thermal stability of foam under radiation as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Step S1: start the monitoring system; Step S2: starting the nitrogen fire protection system; Step S3: After the monitoring system detects that the oxygen concentration has dropped to a concentration that does not support combustion, the oil supply module in the supply system is started to supply oil to the containing system to form an oil layer of a certain thickness; Step S4: starting the radiation system to heat the oil layer in the containing system, simulating the evaporation process of the oil product under different radiation effects, and starting the recovery system to recover the high-temperature oil product vapor under the radiation effect; Step S5: Start the foam generation module in the supply system to supply foam into the containing system to simulate the diffusion process of foam on the surface of high-temperature oil and in the radiation environment, and the monitoring system records the foam movement process in real time; Step S6: When the foam completely covers the surface of the oil product and forms a certain thickness, the supply system stops running, and the monitoring system records the foam destruction process in real time; Step S7: When all the foam is destroyed, record the foam destruction time, and turn off the radiation system, monitoring system, etc.; Step S8: Clean each contaminated system, repeat S1 to S7, and proceed to the next test.

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