A perfluorocyclohexanone fire extinguishing efficiency test system and method

Abstract

This invention discloses a perfluorohexanone (PFH) fire extinguishing performance testing system and method, comprising a PPH storage tank and a laboratory. The PPH storage tank is located outside the laboratory and is connected to the laboratory via a pipeline. An oil pan is located in the center of the laboratory to simulate a fire source. A thermocouple tree is connected to the upper side of the oil pan to measure the temperature at different flame heights. Multiple first thermocouples are installed at different heights on the side walls of the laboratory to measure temperature changes at different heights. Nozzles are detachably connected to the ends of the pipelines. The nozzles are evenly arranged at a designed spacing, and the spray coverage of the nozzles completely covers the protected area of ​​the laboratory. A high-definition camera and a thermal imaging camera are installed in the laboratory. This invention can monitor the fire extinguishing performance of PPH under different spray pressures and nozzle types, and the test data is accurate.

Description

Technical Field

[0001] This invention relates to the field of perfluorohexanone fire extinguishing performance testing technology, and in particular to a perfluorohexanone fire extinguishing effectiveness testing system and method. Background Technology

[0002] Perfluorohexanone, as a highly efficient fire extinguishing agent, has been widely used in various situations, and testing its fire extinguishing performance is crucial for ensuring public safety. Perfluorohexanone extinguishes fires through endothermic cooling and chemical inhibition of the combustion chain reaction. Its effectiveness depends on rapidly reaching the design concentration (usually 4%–6% by volume) within the protected area. Insufficient concentration may lead to fire extinguishing failure, while delaying the attainment of the concentration will give the fire time to spread. Gaseous fire extinguishing systems need to complete the release within a short time to quickly extinguish initial fires and prevent the fire from spreading.

[0003] However, the fire extinguishing performance of perfluorohexanone is related to the type of nozzle used and the injection pressure. The optimal nozzle and injection pressure required for perfluorohexanone fire extinguishing must be determined through experiments to achieve the best fire extinguishing performance. There is no similar comprehensive testing system in the current technology. Summary of the Invention

[0004] To address the above shortcomings, this invention provides a perfluorohexanone fire extinguishing performance testing system, capable of monitoring the fire extinguishing performance of perfluorohexanone under different injection pressures and nozzle types. The specific technical solution is as follows: A perfluorohexanone (PFH) fire extinguishing efficiency testing system includes a PPH storage tank and a laboratory. The PPH storage tank is located outside the laboratory and is connected to the laboratory via a pipeline. An oil pan is located in the center of the laboratory to simulate a fire source. A thermocouple tree is connected to the upper side of the oil pan to measure the temperature at different flame heights. Multiple first thermocouples are installed at different heights on the side walls of the laboratory to measure temperature changes at different heights. Nozzles are detachably connected to the ends of the pipelines. The nozzles are evenly spaced according to a design, and their spray coverage completely covers the protected area of ​​the laboratory. A high-definition camera and a thermal imaging camera are installed inside the laboratory. The high-definition camera records the fire source combustion process, and the thermal imaging camera records the fire extinguishing process.

[0005] Preferably, a square pressure relief port with a side length of 395mm is provided at the top of one side wall of the laboratory, 4.5m above the ground, and the square pressure relief port is equipped with a mechanical pressure relief device.

[0006] Preferably, the laboratory has a smoke exhaust hole on the top, which is connected to a smoke exhaust pipe and a smoke purifier, and the diameter of the smoke exhaust hole is 250mm.

[0007] Preferably, the thermocouple tree includes a connecting rod, and the connecting rod is connected to six second thermocouples, the six second thermocouples being at heights of 0.2m, 0.5m, 1m, 2.0m, 3.0m, and 5m above the ground, respectively.

[0008] Preferably, the heights of the first thermocouples connected to the sidewalls from the ground are 0.3m, 3m, and 5.2m, respectively.

[0009] Preferably, the laboratory has openable doors on its two side walls, and the dimensions of the openable doors are 2m × 1.2m.

[0010] Preferably, the laboratory has observation windows measuring 1.2m × 0.8m on three side walls, and the observation windows are made of CCC-certified fireproof glass.

[0011] Preferably, the high-definition camera is located in front of the fire source, and a connecting bracket is connected to the lower side of the high-definition camera.

[0012] Preferably, the thermal imaging camera is located on top of the laboratory.

[0013] A method for testing the fire extinguishing effectiveness of perfluorohexanone, the method comprising the following steps: S1: First, pour n-heptane into the oil pan in the laboratory as fuel, and then ignite it; S2: After the experiment is ignited, close the laboratory door after 30 seconds of pre-ignition, observe the fire evolution process through the observation window, and manually trigger the fire extinguishing system after the fire has stabilized. The total spraying time of perfluorohexanone extinguishing agent shall not exceed 10 seconds. S3: Record image data using a high-definition camera and a thermal imaging camera, and record the temperature inside the laboratory using a first thermocouple and a second thermocouple; S4: Change the type of nozzle and repeat steps S1-S4 to test the fire extinguishing performance of different nozzles; S5: Adjust the nozzle spray pressure and repeat steps S1-S4 to test the fire extinguishing performance of perfluorohexanone under different spray pressure conditions.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the fire extinguishing performance of perfluorohexanone under different injection pressures and different nozzle types can be monitored, and the test data are accurate.

[0015] 2. This system can analyze the influence of the spray pressure and nozzle type of the fire extinguishing system on the fire control effect, and reveals the temperature change law of the side wall and central vertical temperature of the electrical equipment room under the action of the perfluorohexanone fire extinguishing system.

[0016] 3. This system demonstrates that the extinguishing time of a spiral nozzle is shorter and the concentration distribution is more uniform than that of a jet nozzle, resulting in better extinguishing performance. The conclusions drawn from this system can provide a reference for the selection of future fire extinguishing nozzles. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the left side of the device of the present invention; Figure 2 This is a schematic diagram of the right side of the device of the present invention; Figure 3 This is an outer view of the device of the present invention; Figure 4 The fire evolution process in various firefighting scenarios; Figure 5 Statistics on the extinguishing time of perfluorohexanone; Figure 6 Temperature changes at the side wall of the electrical equipment room when perfluorohexanone is injected through a spiral nozzle; Figure 7 Temperature changes at the side wall of the electrical equipment room when perfluorohexanone is injected through a jet nozzle; Figure 8 Vertical temperature distribution above the fire source in a scenario where perfluorohexanone is sprayed from a spiral nozzle; Figure 9 Vertical temperature variation for fire extinguishing with different nozzle types at a pressure of 0.35 MPa; Figure 10 The vertical temperature peak values ​​are for different nozzle types. In the picture: 1-Perfluorohexanone storage tank, 2-Laboratory, 3-Oil pan, 4-Thermocouple tree, 41-Connecting rod, 42-Second thermocouple, 5-First thermocouple, 6-Nozzle, 7-High-definition camera, 71-Connecting frame, 8-Thermal imaging camera, 9-Pressure relief device. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0023] Example 1 Reference Figures 1-3A perfluorohexanone fire extinguishing efficiency testing system includes a perfluorohexanone storage tank 1 and a laboratory 2. It should be noted that in this embodiment, the laboratory is 5.5 meters high. The perfluorohexanone storage tank 1 is located outside the laboratory 2 and is connected to the laboratory 2 via a pipe. An oil pan 3 is located in the center of the laboratory 2, simulating a fire source. A thermocouple tree 4 is connected to the upper side of the oil pan 3, measuring the temperature at different flame heights. Multiple first thermocouples 5 are installed at different heights on the side walls of the laboratory 2 to measure temperature changes at different heights. Nozzles 6 are detachably connected to the end of the pipe, and the nozzles 6 are evenly arranged at designed intervals, completely covering the laboratory's protected area. A high-definition camera 7 and a thermal imaging camera 8 are installed inside the laboratory 2; the high-definition camera 7 records the fire source combustion process, and the thermal imaging camera 8 records the fire extinguishing process. The top of perfluorohexanone storage tank 1 is equipped with a pressure regulating device. During the experiment, after ignition, the laboratory door 2 is closed after 30 seconds of pre-ignition. The fire evolution process is observed through the observation window. Once the fire has stabilized, the fire extinguishing system is manually triggered. The total spray time of the perfluorohexanone extinguishing agent should not exceed 10 seconds. Figure 4 The fire suppression system depicts the flame evolution process under various fire suppression scenarios, encompassing ignition, development into a steady-state combustion phase, activation of the perfluorohexanone (PFH) extinguishing system, and rapid fire decay to extinguishment. Because the extinguishing system is manually activated, the activation time varies after the fire reaches the steady-state combustion phase, but all systems activate only after this phase. Adjusting the pressure of nozzle 6 using a pressure regulating device, experimental results show that higher spray pressure results in a smaller flame and allows the fire to be extinguished in a shorter time. Overall, the spiral nozzle is more effective than the jet nozzle in extinguishing the fire in laboratory 2, enabling it to be extinguished more quickly.

[0024] A square pressure relief port with a side length of 395mm is installed at the top of one side wall of Laboratory 2, 4.5m above the ground. The square pressure relief port is equipped with a mechanical pressure relief device 9. Pressure relief is achieved by controlling the opening and closing of the mechanical pressure relief device 9.

[0025] Laboratory 2 has a smoke exhaust vent at the top, connected to a smoke exhaust pipe and a smoke purifier. The vent has a diameter of 250mm. The smoke purifier cleans the smoke generated in the laboratory, reducing air pollution.

[0026] The thermocouple tree 4 includes a connecting rod 41, which connects to six second thermocouples 42. The heights of the six second thermocouples 42 from the ground are 0.2m, 0.5m, 1m, 2.0m, 3.0m, and 5m, respectively. In this embodiment, the connecting rod 41 is used to fix the second thermocouples 42. The distance between two second thermocouples 42 increases from bottom to top, adapting to the nonlinear temperature change characteristics of the flame along the height direction. At the bottom of the flame, the chemical reaction is intense, and the temperature changes very rapidly with height, resulting in a large temperature gradient. In the upper part of the flame, combustion tends to be complete, and the temperature change is gradual. This setting can more accurately reflect the flame temperature change.

[0027] Multiple first thermocouples 5 connected to the sidewalls are positioned at heights of 0.3m, 3m, and 5.2m above the ground. The temperature changes of the sidewalls are measured using these first thermocouples 5. Since the sidewalls are relatively far from the flame, the temperature changes are gradual, and the three thermocouples can reflect these temperature variations.

[0028] Laboratory 2 has two operable doors installed on its two side walls. The doors are 2m high and 1.2m wide.

[0029] Observation windows measuring 1.2m wide and 0.8m high are installed on the three side walls of Laboratory 2. The observation windows are made of CCC-certified fireproof glass.

[0030] The high-definition camera 7 is located in front of the fire source, and a connecting bracket 71 is connected to the lower side of the high-definition camera 7.

[0031] Thermal imaging camera 8 is located on top of laboratory 2.

[0032] Example 2: A method for testing the fire extinguishing effectiveness of perfluorohexanone, comprising the following steps: S1: First, pour n-heptane into the oil pan 3 in laboratory 2 as fuel, and then ignite it; S2: After the experiment is ignited, close the two laboratory doors after 30 seconds of pre-ignition. Observe the evolution of the fire in the room through the observation window. After the fire is stable, manually trigger the fire extinguishing system. The total spraying time of perfluorohexanone extinguishing agent shall not exceed 10 seconds. S3: Record image data through high-definition camera 7 and thermal imaging camera 8, and record the temperature inside laboratory 2 through first thermocouple 5 and second thermocouple; S4: Change the type of nozzle 6 and repeat steps S1-S4 to test the fire extinguishing performance of different nozzles 6; S5: Adjust the spray pressure of nozzle 6, repeat steps S1-S4, and test the fire extinguishing performance of perfluorohexanone under different spray pressure conditions.

[0033] The following three experiments can be conducted using the methods described above: First test: Fire extinguishing effectiveness of perfluorohexanone under different nozzle types ① Simulate a fire according to the corresponding method; ② When the fire reaches the predetermined triggering conditions, start the perfluorohexanone fire extinguishing efficiency test system and record the system's release time, flow rate, pressure and other parameters; ③ Observe the release process of perfluorohexanone, use a high-speed camera to record the spray state of nozzle 6, the diffusion trajectory and coverage of the extinguishing agent, and analyze its distribution uniformity at different locations; ④ Monitor the fire suppression and extinguishing process, and record the flame extinguishing time, temperature drop curve, perfluorohexanone concentration change curve, etc.; ⑤ Repeat the test by changing different types of nozzle 6.

[0034] Experimental Results: To analyze the impact of spiral nozzles and jet nozzles on the fire extinguishing performance of the perfluorohexanone fire extinguishing system in Laboratory 2, the peak vertical temperature under various spray pressures was compared, such as... Figure 10 As shown, the peak vertical temperature induced by the jet nozzle in Laboratory 2 is higher than that induced by the spiral nozzle. Furthermore, the temperature difference between the two nozzle types is greater closer to the fire source, primarily influenced by the atomization pattern of the airflow, the immersion velocity of the bottom combustion zone, and the distribution of perfluorohexanone concentration. The spiral nozzle can rapidly transport perfluorohexanone to the bottom space of Laboratory 2, quickly forming a uniform, high-concentration perfluorohexanone immersion zone at the bottom, controlling the fire's combustion behavior and achieving fire extinguishing. Regardless of whether it's a spiral or jet nozzle, higher jet pressure results in a higher peak vertical temperature, especially for spiral nozzles where the peak temperature difference exceeds 100°C due to increased pressure. The pressure change in the jet nozzle has a smaller impact on the peak temperature. The higher the distance from the fire source, the smaller the peak temperature difference, as this area is a hot smoke layer with a smaller temperature rise and less affected by the combustion state.

[0035] The second test: the fire extinguishing performance of perfluorohexanone under different discharge pressures. ① Simulate a fire in the corresponding manner; ② When the fire reaches the predetermined triggering conditions, activate the perfluorohexanone fire extinguishing efficiency test system and record parameters such as release time, flow rate, and pressure; ③ Observe the release process of perfluorohexanone, and use a high-speed camera to record the spray state of nozzle 6, the diffusion trajectory and coverage of the extinguishing agent, and analyze its distribution uniformity at different locations; ④ Monitor the fire suppression and extinguishing process, and record the flame extinguishing time, temperature drop curve, and perfluorohexanone concentration change curve; ⑤ Set different release pressures to repeat the test.

[0036] Experimental results: Figure 5The graph shows the extinguishing time curves of perfluorohexanone under different nozzle types and injection pressures. Experimental results show that with the spiral nozzle, the fire can be extinguished within 10 seconds at various injection pressures. The extinguishing times are 9 seconds, 8 seconds, and 7 seconds at pressures of 0.35 MPa, 0.45 MPa, and 0.6 MPa, respectively. With the jet nozzle, the extinguishing time exceeds 13 seconds at lower injection pressures. Since the system's maximum injection time is 10 seconds, after injection, perfluorohexanone forms a total flood state in laboratory 2, still inhibiting the combustion of combustibles and achieving fire extinguishing. When the injection pressure increases from 0.35 MPa to 0.6 MPa, the extinguishing time decreases from 13 seconds to 9 seconds. Although the reduction in extinguishing time is relatively small with increasing pressure for both types of nozzles, they are extremely effective in extinguishing fires, promptly suppressing initial fires and preventing catastrophic accidents. Figure 9 A comparison of the temperature above the fire source under the action of spiral nozzles and jet nozzles shows a good mapping relationship between the vertical temperature change and the evolution of the flame image. A comparison of the flame image and the injection time clearly shows that the fire extinguishing system is activated before reaching the peak temperature, and a significant entrainment airflow is formed on the ground, causing the temperature to rise to the peak. At a injection pressure of 0.35 MPa, the vertical temperature peak induced by the jet nozzle's perfluorohexanone extinguishing effect in the electrical equipment room is higher, and the temperature decay is slower, resulting in the electrical equipment room being affected by high temperatures for a longer period after the fire extinguishing system is activated. However, the spiral nozzle has a better fire extinguishing effect, with a shorter period of high temperature exposure and a lower temperature peak in the electrical equipment room, thus reducing the risk of igniting more combustibles indoors.

[0037] The third type of test: Test of the protective range of perfluorohexanone. ① Multiple ignition sources were arranged within the test area; ② When the fire reached the predetermined triggering conditions, the perfluorohexanone fire extinguishing efficiency test system was activated, and parameters such as release time, flow rate, and pressure of the system were recorded; ③ The release process of perfluorohexanone was observed, and the spraying state of nozzle 6, the diffusion trajectory and coverage of the extinguishing agent were recorded using a high-speed camera, and its distribution uniformity at different locations was analyzed; ④ The fire suppression and extinguishing process was monitored, and the flame extinguishing time, temperature drop curve, and perfluorohexanone concentration change curve at different locations were recorded.

[0038] Experimental Results: The higher the spray pressure of the perfluorohexanone fire extinguishing efficiency test system, the greater the mass of perfluorohexanone sprayed into laboratory 2 per unit time, enabling the perfluorohexanone concentration in laboratory 2 to reach the critical extinguishing concentration earlier, thus resulting in a shorter extinguishing time. The spiral nozzle 6 has spiral grooves inside; under high pressure, perfluorohexanone is sprayed through these grooves to form a conical atomized space covering the combustion zone, creating a more uniform perfluorohexanone concentration distribution within the room. The jet nozzle, on the other hand, relies on a cavity structure, accelerating the extinguishing agent into a high-speed jet through pressure, forming a conical jet. Atomization distribution is achieved through the frictional shear force between the jet and air, resulting in a smaller coverage area and less uniform concentration distribution. Therefore, the spiral nozzle has a better fire extinguishing effect and can extinguish the fire in laboratory 2 in a shorter time.

[0039] Reference Figure 6 and Figure 7 During the experiment, the sidewall temperature was measured simultaneously. After the perfluorohexanone fire extinguishing system in Laboratory 2 was activated, the high-pressure jet extinguishing agent impacted the ground combustion zone, forming a perfluorohexanone jet cloud rising from the ground. This resulted in a lower temperature in the ground sidewall area. Figure 6 As shown. After the perfluorohexanone was first sprayed, the temperature at the bottom of the side walls of Laboratory 2 dropped below the ambient temperature. After the spraying stopped and the fire was extinguished, the temperature gradually returned to ambient temperature. Because the jet stream decreased in speed and expanded in its downward spraying from 3.3m, the bottom temperature did not reach its lowest point immediately upon spraying. Instead, it gradually decreased and reached its lowest temperature after the fire was extinguished. Then, the perfluorohexanone gradually dissipated, causing the temperature to rise back to ambient temperature. The higher the spraying pressure, the faster the temperature at the bottom of the side walls of Laboratory 2 decreased, and the lower the minimum temperature. This was mainly because the jet velocity was higher and more extinguishing agent was sprayed per unit time, resulting in a more significant temperature drop at the bottom, with the minimum temperature below 0℃. The temperature at the top of the side walls showed a slight increase during the extinguishing agent spraying process, exceeding 10℃. This was mainly because the sprayed extinguishing agent impacted the ground and was drawn upwards, pushing the hot combustion gas stream towards the top of Laboratory 2, causing the top temperature to rise. Due to the buoyancy of the heat, the top temperature reached its peak and then decreased slowly, eventually returning to ambient temperature. The higher the spray pressure of a perfluorohexanone fire extinguishing system, the higher the peak temperature at the top of the side wall. This is mainly because the bottom has a greater inertial force that pushes the hot airflow to the top. However, the overall temperature rise at the top is relatively small and insufficient to ignite solid combustibles.

[0040] The temperature above the fire source changes significantly as it progresses from ignition to steady-state combustion and then to extinguishing the fire. Because the oil pan burns rapidly to a steady state after ignition, the temperature at each measuring point rises rapidly to its peak value after ignition. Upon activation of the perfluorohexanone extinguishing system, the temperature exhibits an exponential decay and eventually reaches ambient temperature. Figure 8As shown, the closer to the fire source, the higher the peak temperature and the faster the temperature rises. During the decay phase, the temperature drops more slowly. This is mainly because those closer to the fire source are affected by the high temperature of the flame earlier and are in the flame zone, where the temperature is higher. During the extinguishing phase, the flame on the oil pan's combustion surface is gradually extinguished, and the oil surface remains hot, hence the slower the temperature drops closer to the fire source. The peak temperature at 0.2m from the fire source exceeds 350℃, while the peak temperature rise at 5.0m directly above the fire source and 0.5m below the ceiling is only about 10℃. The temperature rise in this area is mainly due to the spread of hot smoke below the ceiling, and the formation of a mixed gas with cold air due to entrainment, resulting in a lower temperature rise. As the injection pressure increases, the transient peak temperature, especially the peak temperature near the combustion surface, is higher. This is mainly because the two extinguishing agent nozzles are located on both sides of the fire source. The high-pressure jet from the top down on both sides creates an airflow at the extinguishing agent's leading edge. This airflow on both sides aids combustion on the oil pan's combustion surface, resulting in a transiently high temperature. However, the temperature drops rapidly once the extinguishing agent submerges the oil pan. The experimental results show that the temperature values ​​within 1m above the ground are relatively high, all exceeding 100℃. The temperature rise peak is lower in areas above 1m, mainly because the 1m range is in the continuous flame zone and intermittent flame zone, while the area beyond 1m is the hot flue gas zone with a lower temperature rise.

[0041] As a further embodiment, the top of the perfluorohexanone storage tank 1 is provided with a bottle head valve, an electromagnetic starter on the bottle head valve, and an electromagnetic starter. The bottle head valve controls the pressure release of the perfluorohexanone storage tank 1 through a pressure release switch.

[0042] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A perfluorohexanone fire extinguishing performance testing system, characterized in that, The system includes a perfluorohexanone storage tank (1) and a laboratory (2). The perfluorohexanone storage tank (1) is located outside the laboratory (2). The perfluorohexanone storage tank (1) is connected to the laboratory (2) through a pipe. An oil pan (3) is provided in the middle of the laboratory (2). The oil pan (3) is used to simulate a fire source. A thermocouple tree (4) is connected to the upper side of the oil pan (3). The thermocouple tree (4) is used to measure the temperature at different flame heights. Multiple first thermocouples (5) are provided at different heights on the side walls of the laboratory (2) to measure the temperature changes at different heights on the side walls. A nozzle (6) is detachably connected to the end of the pipe. The nozzles (6) are evenly arranged at the designed spacing. The spray coverage of the nozzles (6) completely covers the laboratory protection area. A high-definition camera (7) and a thermal imaging camera (8) are arranged in the laboratory (2). The high-definition camera (7) is used to record the fire source combustion process. The thermal imaging camera (8) is used to record the fire extinguishing process.

2. The perfluorohexanone fire extinguishing efficiency testing system according to claim 1, characterized in that, A square pressure relief port with a side length of 395mm is provided at the top of one side wall of the laboratory (2) at a distance of 4.5m from the ground. The square pressure relief port is equipped with a mechanical pressure relief device (9).

3. The perfluorohexanone fire extinguishing efficiency testing system according to claim 2, characterized in that, The laboratory (2) has a smoke exhaust hole on the top, which is connected to a smoke exhaust pipe and a smoke purifier. The diameter of the smoke exhaust hole is 250mm.

4. The perfluorohexanone fire extinguishing performance testing system according to claim 3, characterized in that, The thermocouple tree (4) includes a connecting rod (41) which is connected to six second thermocouples (42). The heights of the six second thermocouples (42) from the ground are 0.2m, 0.5m, 1m, 2.0m, 3.0m and 5m respectively.

5. The perfluorohexanone fire extinguishing performance testing system according to claim 1, characterized in that, The heights of the first thermocouples (5) connected to the sidewalls from the ground are 0.3m, 3m, and 5.2m, respectively.

6. The perfluorohexanone fire extinguishing performance testing system according to claim 5, characterized in that, The laboratory (2) has two side walls with openable doors, each with a height of 2m and a width of 1.2m.

7. The perfluorohexanone fire extinguishing performance testing system according to claim 6, characterized in that, The laboratory (2) has observation windows with dimensions of 1.2m wide and 0.8m high on three side walls. The observation windows are made of CCC-certified fireproof glass.

8. The perfluorohexanone fire extinguishing performance testing system according to claim 7, characterized in that, The high-definition camera (7) is located in front of the fire source, and a connecting bracket (71) is connected to the lower side of the high-definition camera (7).

9. The perfluorohexanone fire extinguishing performance testing system according to claim 1, characterized in that, The thermal imaging camera (8) is located on top of the laboratory (2).

10. A method for testing the fire extinguishing effectiveness of perfluorohexanone, characterized in that, Using the perfluorohexanone fire extinguishing performance testing system according to any one of claims 1-9, the method comprises the following steps: S1: First, pour n-heptane into the oil pan (3) in the laboratory (2) as fuel, and then ignite it; S2: After the experiment is ignited, close the laboratory (2) door after 30 seconds of pre-ignition. Observe the evolution of the fire in the room through the observation window. After the fire is stable, manually trigger the fire extinguishing system. The total spray time of perfluorohexanone fire extinguishing agent shall not exceed 10 seconds. S3: Record image data through a high-definition camera (7) and a thermal imaging camera (8), and record the temperature inside the laboratory (2) through a first thermocouple (5) and a second thermocouple; S4: Change the type of nozzle (6), repeat steps S1-S4, and test the fire extinguishing performance of different nozzles (6); S5: Adjust the spray pressure of the nozzle (6), repeat steps S1-S4, and test the fire extinguishing performance of perfluorohexanone under different spray pressure conditions.

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