System and method for testing storage performance of gas extinguishing agent

Abstract

The invention discloses a gas extinguishing agent storage performance testing system and method, and the system comprises a glass container which is used for accommodating a to-be-tested extinguishing agent and a metal sample; the pressure container is used for accommodating the glass container and a pressure medium; the constant temperature and humidity chamber is used for accommodating the pressure container and simulating a test environment; and the detection device is used for detecting the corrosion degree of the metal sample in the glass container. The gas extinguishing agent storage performance testing system and the testing method have the beneficial effects that testing and evaluation are achieved by detecting the corrosion degree of the metal sample.

Description

Technical Field

[0001] The present invention relates to the technical field of fire extinguisher testing, and in particular to a gas fire extinguishing agent storage performance testing system and testing method. Background Art

[0002] When storing the new generation of gas fire extinguishing agents under real-world conditions, a variety of metal materials are widely present in their storage containers. Once the metal materials fail, the storage containers will be at risk of leakage, failure, or even explosion. This will directly affect the life and functionality of the storage containers, and is an important limitation to the widespread use of gas fire extinguishing agents.

[0003] However, there is currently no effective test on the storage performance of gas fire extinguishing agents. Summary of the Invention

[0004] The content of this application is used to briefly introduce the concepts that will be described in detail in the detailed description section below. The content of this application is not intended to identify the key features or essential features of the technical solution for protection, nor is it intended to limit the scope of the technical solution for protection.

[0005] Some embodiments of the present application provide a gas fire extinguishing agent storage performance testing system and testing method to solve the technical problems mentioned in the above background technology section.

[0006] As a first aspect of the present application, some embodiments of the present application provide a gas fire extinguishing agent storage performance testing system, comprising: a glass container for containing the fire extinguishing agent to be tested and a metal sample; a pressure vessel for containing the glass container and the pressure medium; a constant temperature and humidity chamber for containing the pressure vessel and simulating the test environment; and a detection device for detecting the degree of corrosion of the metal sample in the glass container.

[0007] In some embodiments of the present application, the gas fire extinguishing agent storage performance testing system further includes: a pressure detection device for detecting the pressure in the pressure container.

[0008] In some embodiments of the present application, the gas fire extinguishing agent storage performance testing system also includes: a controller for controlling the constant temperature and humidity chamber; wherein the pressure detection device is electrically connected to the controller so that the controller controls the constant temperature and humidity chamber according to the pressure detection device.

[0009] In some embodiments of the present application, the pressure vessel includes: a pressure cylinder, which forms a pressure chamber; a pressure cover, which is used to close the pressure chamber; and fixing bolts, which are used to fix the pressure cover to the pressure cylinder.

[0010] In some embodiments of the present application, the pressure vessel includes: a pressure sensor, arranged between the pressure cover and the pressure cylinder to detect the pressure therebetween; wherein the pressure sensor is communicatively connected to the controller so that the controller controls the temperature change of the constant temperature and humidity chamber according to the pressure sensor.

[0011] As a second aspect of the present application, some embodiments of the present application provide a method for testing the storage performance of a gas fire extinguishing agent, comprising the following steps: placing the metal sample into the glass container; placing the glass container containing the metal sample into a pressure vessel and sealing the pressure vessel; placing the pressure vessel into the constant temperature and humidity chamber for preservation according to a preset process; and using the detection device to detect the metal sample in the pressure vessel that has completed the preservation according to the preset process in the constant temperature and humidity chamber.

[0012] In some embodiments of the present application, the gas fire extinguishing agent storage performance testing system further includes: a pressure detection device for detecting the pressure inside the pressure vessel; the gas fire extinguishing agent storage performance testing method further includes the following steps: injecting pressurized gas into the pressure vessel so that the interior of the pressure vessel has a preset pressure.

[0013] In some embodiments of the present application, the gas fire extinguishing agent storage performance testing system also includes: a controller for controlling the constant temperature and humidity chamber; wherein the pressure detection device is electrically connected to the controller so that the controller controls the constant temperature and humidity chamber according to the pressure detection device; the gas fire extinguishing agent storage performance testing method also includes the following steps: the controller fine-tunes the temperature change of the constant temperature and humidity chamber according to the pressure detected by the pressure detection device.

[0014] In some embodiments of the present application, the pressure vessel includes: a pressure cylinder, which forms a pressure chamber; a pressure cover for sealing the pressure chamber; and fixing bolts for fixing the pressure cover to the pressure cylinder; the gas fire extinguishing agent storage performance testing method further includes the following steps: placing the glass container into the pressure cylinder and fixing the pressure cover with the fixing bolts.

[0015] In some embodiments of the present application, the pressure vessel includes: a pressure sensor, which is arranged between the pressure cover and the pressure cylinder to detect the pressure therebetween; wherein the pressure sensor is communicatively connected with the controller so that the controller controls the temperature change of the constant temperature and humidity chamber according to the pressure sensor; the gas fire extinguishing agent storage performance testing method also includes the following steps: the controller adjusts the temperature of the constant temperature and humidity chamber according to the pressure signal of the pressure sensor.

[0016] The beneficial effect of the present application is that it provides a gas fire extinguishing agent storage performance testing system and testing method for testing and evaluating the corrosion degree of metal samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0018] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the elements and components are not necessarily drawn to scale.

[0019] In the attached figure:

[0020] Figure 1 1 is a schematic structural diagram of a gas fire extinguishing agent storage performance testing system according to an embodiment of the present application;

[0021] Figure 2 yes Figure 1 The structure diagram of the gas fire extinguishing agent storage performance test system shown is viewed from another perspective;

[0022] Figure 3 yes Figure 1 The schematic diagram of the structure of the pressure vessel in the gas fire extinguishing agent storage performance test system shown;

[0023] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of the pressure vessel shown;

[0024] Figure 5 yes Figure 3 Schematic diagram of the explosion structure of the pressure vessel shown;

[0025] Figure 6 yes Figure 3 The schematic diagram of the explosion structure of the pressure vessel shown is observed from another perspective;

[0026] Figure 7 yes Figure 3 A schematic diagram of the structure of the mounting plate and the pressure sensor mounted to the cylinder in the pressure vessel shown;

[0027] Figure 8 yes Figure 3 Schematic diagram of the position distribution of pressure sensors and pressure blocks in the pressure vessel shown;

[0028] Figure 9 yes Figure 3 A schematic diagram of a partial cross-sectional structure of a pressure vessel shown;

[0029] Figure 10 This is a schematic diagram of the dimensions of a metal sample according to an embodiment of the present application ( Figure 10 The unit is cm);

[0030] Figure 11 This is a physical photo of a metal sample according to an embodiment of the present application;

[0031] Figure 12 It is a schematic diagram of the principle of the low boiling point fire extinguishing agent filling scheme;

[0032] Figure 13 It is a high boiling point fire extinguishing agent filling solution;

[0033] Figure 14 1 is a schematic diagram of the system architecture of a gas fire extinguishing agent storage performance testing system according to an embodiment of the present application;

[0034] Figure 15 It is a schematic diagram of the main steps of a control method according to an embodiment of the present application.

[0035] Description of reference numerals:

[0036] 100. Test system; 110. Pressure vessel; 111. Pressure cylinder; 111a. Pressure chamber; 111b. Cylinder bolt hole; 112. Pressure cover; 112a. Feed inlet; 112b. Discharge outlet; 112c. Cover bolt hole; 113. Pressure sensor; 114. Pressure block; 114a. Block hole; 115. Mounting plate; 115a. Plate hole; 116. Pressure detection device; 117. Grille; 118. Glass container; 120. Constant temperature and humidity chamber; 200. Fire extinguishing agent cylinder; 300. Refrigerator; 400. Bracket; 500. Peristaltic pump; 600. Electronic balance. DETAILED DESCRIPTION

[0037] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0038] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0039] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0040] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0041] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0042] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0043] Reference Figures 1 to 15 As shown, as a first aspect of the present application, some embodiments of the present application provide a gas fire extinguishing agent storage performance testing system 100 mainly including: a glass container 118, a pressure container 110 and a constant temperature and humidity chamber 120, etc.

[0044] The glass container 118 is used to contain the fire extinguishing agent to be tested and the metal sample. The purpose of using the glass container 118 is to prevent the fire extinguishing agent from corroding the pressure vessel 110.

[0045] Specifically, the pressure vessel 110 is used to accommodate the glass container 118 and the pressure medium; the constant temperature and humidity chamber 120 is used to accommodate the pressure vessel 110 and simulate the test environment; and the detection device is used to detect the corrosion degree of the metal sample in the glass container 118 .

[0046] It should be noted that the specific structure and function of the constant temperature and humidity chamber 120 are already well known to those skilled in the art and will not be described in detail here.

[0047] In some embodiments of the present application, the gas fire extinguishing agent storage performance testing system 100 may further include a pressure detection device 116. The pressure detection device 116 is used to detect the pressure within the pressure vessel 110. As a specific solution, the pressure detection device 116 may be a pressure gauge, or other devices capable of testing fluid pressure.

[0048] Reference Figure 14As shown, in some embodiments of the present application, the gas fire extinguishing agent storage performance testing system 100 further includes a controller. The controller is used to control a constant temperature and humidity chamber 120; a pressure detection device 116 is electrically connected to the controller, so that the controller controls the constant temperature and humidity chamber 120 based on the pressure detection device 116. This can prevent pressure anomalies in the constant temperature and humidity chamber 120 caused by changes in temperature and humidity during the testing process. The controller obtains the pressure inside the pressure vessel 110 through the pressure detection device 116. When the pressure exceeds or falls below a threshold, the controller determines whether a danger exists based on the current temperature and humidity of the constant temperature and humidity chamber 120. For example, if further temperature increase causes the internal pressure to exceed the safety value of the pressure vessel 110, the controller will control the constant temperature and humidity chamber 120 to cool down and simultaneously relieve the pressure of the pressure vessel 110 through the corresponding valve.

[0049] In some embodiments of the present application, reference Figures 3 to 9 As shown, the pressure vessel 110 specifically includes: a pressure cylinder 111, a pressure cover 112 and fixing bolts (not shown in the figure).

[0050] More specifically, the pressure cylinder 111 is formed with a pressure chamber 111 a ; the pressure cover 112 is used to seal the pressure chamber 111 a ; and the fixing bolts are used to fix the pressure cover 112 to the pressure cylinder 111 .

[0051] As a specific solution, the pressure cylinder 111 is primarily used to provide a storage space for the aforementioned glass container 118, metal specimen, and pressure medium. As a preferred solution, the pressure cylinder 111 can be constructed as an open-top cylindrical structure with a mounting flange (not shown) formed around its top periphery. The mounting flange is provided with a plurality of barrel bolt holes 111b for the passage of fixing bolts.

[0052] Reference Figures 4 to 6 As shown, as an optional solution, the pressure vessel 110 further includes a grid 117, which is disposed in the pressure cylinder 111 and can be supported by the edge of the glass container 118; the grid 117 can be used to suspend the sample, and a metal wire can be passed through the through hole of the sample and then hung to the grid 117, so that multiple samples can be tested at one time.

[0053] Specifically, the pressure cover 112 is provided with a plurality of cover bolt holes 112c corresponding to the cylinder bolt holes 111b. The fixing bolts can pass through the cover bolt holes 112c and the cylinder bolt holes 111b, and then be locked by fixing nuts (not shown in the figure). That is, the pressure cover 112 can be pressed to the pressure cylinder 111 under the action of the fixing bolts and fixing nuts.

[0054] It is understandable that the present application can also achieve sealing of the pressure chamber 111 a through a sealing structure such as a sealing ring between the pressure cover 112 and the pressure cylinder 111 .

[0055] As a specific solution, in order to inject fire extinguishing agent or pressure medium into the pressure chamber 111a, the pressure cover 112 is provided with a feed port 112a and a discharge port 112b, and the feed port 112a and the discharge port 112b are respectively connected to the pressure chamber 111a, so that the fire extinguishing agent can enter or flow out of the pressure chamber 111a as needed.

[0056] It should be noted that the feed port 112a and the discharge port 112b should be provided with corresponding valves and pumps, or be provided with an integrated device with integrated valve and pump functions, so that the controller can control the conduction or disconnection of the feed port 112a and the discharge port 112b.

[0057] Reference Figures 3 to 9 As shown, to further precisely control the pressure and ensure better sealing performance of the pressure vessel 110, as a specific solution, the pressure vessel 110 specifically includes a pressure sensor 113. The pressure sensor 113 is positioned between the pressure cover 112 and the pressure cylinder 111 to detect the pressure therebetween. The pressure sensor 113 is communicatively connected to the controller, allowing the controller to adjust the temperature change rate of the constant temperature and humidity chamber 120 based on the pressure sensor 113.

[0058] Specifically, the pressure vessel 110 further includes a mounting plate 115 and a pressure block 114. An annular mounting groove (not shown) may be provided at the end of the pressure cylinder 111, and the mounting plate 115 may be mounted within the mounting groove. The mounting plate 115 includes a plurality of holes 115a corresponding to the cap bolt holes 112c and the barrel bolt holes 111b. Two pressure sensors 113 are located on opposite sides of the holes 115a. These sensors sense changes in pressure when the fixing bolts are tightened by the fixing nuts.

[0059] As an alternative, the pressure sensor 113 can be equipped with a built-in battery and a wireless communication module so that it can function normally after being deployed. Of course, this will increase the cost of the pressure sensor 113 and test the battery's endurance.

[0060] As an optional solution, wire embedding may be performed in the pressure cylinder 111 so that the pressure sensors 113 can be electrically connected to the controller or the peripheral circuit of the controller, thereby obtaining the required electrical energy and transmitting signals.

[0061] As a more specific solution, the pressure cover 112 is provided with a groove (not marked in the figure), a corresponding pressing block 114 is arranged in the groove, and the pressing block 114 is provided with a block hole 114a for the fixing bolt to pass through.

[0062] Reference Figure 9 As shown, after the fixing bolts and the fixing nuts are tightened, the pressing block 114 can apply pressure to the mounting plate 115 and the pressure sensor 113 , and this pressure will change with the gas pressure in the pressure vessel 110 .

[0063] During the test, temperature changes will occur, especially when the temperature change rate is high, that is, when the temperature is changing rapidly, so the pressure inside the pressure chamber 111a will also change rapidly. At this time, the force received by the pressure vessel 110 for sealing the fixing bolt will change. Generally speaking, when the change is slow, the plastic deformation of the fixing bolt can respond to the force, thereby ensuring the stability of the fixed connection. However, when the force changes rapidly, the fixing bolt is easily deformed and cannot respond to the force in time, thereby making the fixed connection unstable and easily causing the risk of leakage in the pressure chamber 111a.

[0064] This can easily cause leakage of the pressure chamber 111a during the test and excessive pressure, posing a safety hazard. This is especially likely to happen during rapid temperature increases and decreases. However, using a slow temperature change will undoubtedly affect the test efficiency. At the same time, increasing the pressure chamber 111a is more likely to result in an increase in the number of fixing bolts. This not only fails to solve the above-mentioned problem, but exacerbates it due to the size and number of fixing points.

[0065] Reference Figure 8 、 Figure 9 and Figure 14 As shown, the controller of the present application obtains data from multiple pressure sensors 113 to determine the stress on the fixing bolts. The controller then adjusts the temperature of the constant temperature and humidity chamber 120 based on the stress on the fixing bolts (actually based on the pressure data from the pressure sensors 113) (of course, the temperature can also be adjusted indirectly by adjusting the humidity). The controller can be integrated into the constant temperature and humidity chamber 120.

[0066] Reference Figures 5 to 9 As shown, the mounting plate 115 and the pressure block 114 can be made of a first type of metal material, while the pressure cylinder 111 can be made of a second type of metal material. The first type of metal material has a greater hardness than the second type of metal material. This allows the pressure sensor 113 to more sensitively detect pressure. As a further preferred embodiment, the fixing bolts can be made of the first type of metal material.

[0067] Reference Figure 8As shown, as an optional solution, the angles between the line D connecting the centers of the two pressure sensors 113 corresponding to a pressure block 114 and the radial direction R of the block hole 114a of the pressure block 114 are different. In this way, firstly, the appropriate relationship of the force received by the fixing bolt at that location can be obtained through the two pressure sensors 113 corresponding to the pressure block 114; secondly, for the entire pressure vessel 110, the overall force relationship of the pressure cover 112 can also be detected through the pressure readings of the pressure sensors 113 corresponding to different pressure blocks 114. In this way, when sealing, the user can be assisted in operating the fixing bolts and fixing nuts so that the overall force of the pressure vessel 110 is relatively balanced.

[0068] Reference Figures 1 to 10 As shown, as a second aspect of the present application, a method for testing the storage performance of a gas fire extinguishing agent comprises the following steps:

[0069] S1 places the metal sample into a glass container 118;

[0070] S2: placing the glass container 118 containing the metal sample into the pressure vessel 110 and sealing the pressure vessel 110;

[0071] S3: placing the pressure container 110 into a constant temperature and humidity chamber 120 for storage according to a preset process;

[0072] S4 uses a detection device to detect the metal sample in the pressure container 110 that has completed the preset process in the constant temperature and humidity box 120.

[0073] Reference Figures 1 to 15 As shown, as a specific implementation scheme of this application, it is described in detail as follows:

[0074] According to Table 5, "Allowable Stress of High-Alloy Steel Plate," in GB / T150.2-2023, "Pressure Vessel 110 Materials," the allowable stress of S30408 ​​below 100°C is no less than 114 MPa. Furthermore, according to GB / T150.3-2023, "Pressure Vessel 110 Design," the default internal pressure vessel configuration is a cylindrical one. Therefore, a cylindrical pressure vessel 110 was selected as the experimental vessel configuration. Based on manufacturing requirements, the experimental vessel configuration selected Table 5.9.8, "Bolted Circular Pressure Seal 112," and Form C.3 in Appendix C of GB / T150.3-2023, "Pressure Vessel 110 Design," as the Bolted Circular Pressure Seal 112 configuration. Furthermore, the integral flange described in 7.4.3 was added to the bolted mounting locations within the pressure seal 112 structure. The overall pressure seal 112 is a cylindrical flanged pressure seal 112.

[0075] According to SW6-2011 (process equipment strength calculation software), under a pressure of 6 MPa, the total cross-sectional area of ​​the bolts in the experimental container should not be less than 0.03 of the inner cavity area, the wall thickness of the cylindrical container should not be less than 6 mm, and the total thickness of the head should not be less than 27 mm in the case of opening compensation.

[0076] The entire cylinder is made of 304 stainless steel and is designed as a flanged cylindrical body with a smooth, flat surface. The cylinder wall is 7mm thick; the inner cavity is 80mm high and 180mm in diameter; the step is 16mm high and 196mm in diameter; and the flange is 23mm thick and 240mm in diameter. The flange is equipped with bolt holes with an outer diameter of 11mm and an inner diameter of 10mm. The centers of the bolt holes are evenly distributed along a 216mm diameter circle centered on the flange.

[0077] The pressure cover 112 is made entirely of 304 stainless steel and is designed as a flat cover with a flange. The total thickness of the pressure cover 112 is 37mm in height, with a flange thickness of 20mm. The pressure cover 112 has three stepped circular holes: the feed port 112a, the discharge port 112b, and the pressure gauge port. The diameter of the upper hole on each step is 14mm, and the lower hole on the step: the pressure gauge port has a diameter of 4mm, its center coinciding with the center of the pressure cover 112; the feed port 112b has a diameter of 6mm, and its center is located at either end of a 160mm diameter circle centered on the center of the pressure cover 112. To facilitate material loading and unloading during actual use, a 50mm long threaded steel column is welded to the feed port for connecting the valve. Twelve bolt holes with an outer diameter of 11 mm and an inner diameter of 10 mm are opened on the flange of the pressure cover 112, and the centers of all the bolt holes are evenly distributed on a circle with a diameter of 216 mm and the center of the flange as the center.

[0078] According to Item 11.2 of GB / T150.4-2023, "Pressure Vessels 110," which states, "The pressure gauge range should be 1.5 to 3 times the test pressure, with an accuracy of at least Class 1.6 and a dial diameter of at least 100 mm," a pressure gauge with a range of 6-13 MPa (0.2 MPa accuracy) should be used during the experiment. The pressure gauge is connected to the pressure gauge port on pressure cover 112 to monitor pressure changes within the test vessel.

[0079] According to the project requirements, the length × width × height of the metal sample used in the experiment is determined to be 15mm * 5mm * 3mm. In order to facilitate mounting, a straight hole with a diameter of 4mm is opened in the upper part of the metal sample. The size of the metal sample is as follows Figure 10 As shown, the actual Figure 11 shown.

[0080] The constant temperature and humidity chamber 120 is programmed to maintain periodic temperature changes inside, achieving a temperature change of 50-0°C and a temperature maintenance of 25°C, and can achieve an internal temperature fluctuation of ±1°C within a 24h temperature cycle.

[0081] When the temperature is alternating during the experiment, the experimental container is placed on the internal shelf of the constant temperature and humidity chamber 120 and placed steadily. The pressure change of the internal pressure gauge can be observed through the observation window. Figure 2 shown.

[0082] According to GB / T150.3-2023 "Design of Pressure Vessels 110," item C.1 states, "The vessel may use sealing methods such as flat gaskets." To ensure the airtightness of the test vessel during the experiment, the pressure cover 112 and the cylinder must be in seamless contact throughout the test cycle. Based on engineering practice and the test results of 3.11, an O-ring was selected as an elastic filler on the cylinder step. Due to the high test pressure, the O-ring needed to maintain a certain strength to withstand the pressure when tightening the pressure cover 112 and the cylinder.

[0083] Based on the 8mm step width and the description in Table 2 of GB / T3452.1-2005, "Hydraulic and Pneumatic O-Ring Dimension Series and Tolerances," combined with commonly used finished product specifications, a hollow fluoropolymer O-ring with an outer diameter of 6-7.5mm can be used for this experiment. The O-ring can be made of a variety of materials, as long as it has good elasticity and the ability to withstand high pressure without breaking.

[0084] The fixing bolts must ensure stable pressure resistance for the experimental vessel and limit deformation of the pressure cover 112 under high pressure. Therefore, according to calculations in SW-2016 and combined with Formula 7-3 in 7.5.2.1, "Bolt Arrangement," of GB / T150.3-2023 "Design of Pressure Vessels 110," the bolt spacing should not exceed 28 mm. According to Formula 7-8 in 7.5.2.3, "Bolt Area," the total cross-sectional area must be no less than 600 cm². Combined with the calculation results in SW-2011, this experiment employed twelve 304 stainless steel M10 full-thread bolts for fastening.

[0085] The fixing bolts must have the ability to remain tight under alternating high and low temperatures. Based on this principle, the experiment can use 304 stainless steel bolts with spring washers or 304 stainless steel bolts with self-tightening nuts to achieve tightening.

[0086] When the gas cylinder injects nitrogen into the experimental container, the internal pressure is 4.2Mpa or even higher, which requires the gas pipe to have sufficient pressure resistance.

[0087] According to Item 3.3 of JB / T13780-2019, "Technical Specifications for Gas Pipes in Construction Machinery," which states that "the maximum operating pressure of reinforced rubber hoses is 300kPa," pure rubber hoses (even reinforced hoses) cannot be used when pressure is at least 4.2 MPa. Therefore, in commercially available products, rubber hoses with brass connectors and internal steel wire wrapping or wire-wrapped stainless steel gas pipes are used in experiments. All components connected to the gas pipeline must meet a pressure resistance of at least 4.2 MPa.

[0088] According to Item 4.1.1 of JB / T7901-2001 “Method for Laboratory Uniform Corrosion Immersion Test of Metal Materials”, “The container medium should be made of materials that are inert to the corrosive medium, such as glass”, the inner wall of the experimental container should be isolated from the metal sample used in the experiment to avoid electrochemical corrosion.

[0089] Therefore, in this experiment, a glass liner that is inert to organic matter is placed in a stainless steel experimental container to prevent the stainless steel wall from contacting the fire extinguishing agent and the metal sample, thereby ensuring that the metal sample is completely chemically corroded in the experiment.

[0090] After all components in the test container have been confirmed, a full-process, full-component detection test must be carried out. The key test items are the container pressure test and leakage test (air tightness).

[0091] According to the requirements of Item 11.1 "Pressure Test" in GB / T150.4-2023 "Pressure Vessels 110" and Item 4.6.2 "The air pressure test pressure of internal pressure vessels is 1.1 times the maximum allowable working pressure" in GB / T150.1-2023 "Pressure Vessels 110", during the pressure test, the test vessel was pressurized to 5.5Mpa (1.43 times the working pressure) and left for 30 minutes. The pressure gauge did not drop, which met the pressure test requirements.

[0092] According to the air tightness test item 11.5.3 in GB / T150.4-2023 "Pressure Vessel 110", "the air tightness test pressure is the design pressure of the container, and small containers can be immersed in water for observation", during the test, the test containers were pressurized to 1.2Mpa and 6Mpa (1.15 times the test pressure) and then placed in water. No bubbles were observed, which meets the leakage test requirements.

[0093] According to Item 3.2.6 of JB / T7901-2001, "Metal Materials Laboratory Uniform Corrosion Full Immersion Test Method," which states, "The sharp corners of the specimen should be maintained; chamfering is not permitted," metal specimens should meet the following requirements during testing: the metal substrate should be unobstructed, the surface should be smooth and flat, and the edges should be sharp and angular. Furthermore, in accordance with Item 3.2.4 of JB / T7901-2001, "Metal Materials Laboratory Uniform Corrosion Full Immersion Test Method," which states, "To improve the uniformity of the test results, sandpaper or other mechanical methods may be used to remove the original metal surface layer," metal specimens should be ground and polished before testing.

[0094] When processing metal specimens, first use an angle grinder to clean the metal protective layer. Then, use 800-grit, 1000-grit, and 2000-grit sandpaper to polish the metal specimen. Once the metal specimen surface is flat, smooth, and shiny, use anhydrous ethanol to perform ultrasonic cleaning for 2 minutes or soak it repeatedly 2-3 times to ensure that there is no processing dust on the metal specimen surface. The treated metal specimen should be stored after vacuum drying.

[0095] Since the bare metal substrate is prone to oxidation, the processed metal samples should be stored for no more than 7 days and should preferably be prepared as needed.

[0096] In accordance with GB / T19291-2003 "Corrosion of Metals and Alloys - General Principles of Testing for Corrosion," Item 3.3.3 states that "Metal specimens should be cleaned quickly and stored in a desiccator until they reach room temperature before measuring their area and weighing." Item 3.3.6 states that "Weighing should be performed using an analytical balance 600 with an accuracy of not less than ±0.5 MPa." Furthermore, Item 7.2 states that "At least three parallel specimens should be used" in GB / T19746-2018 "Corrosion of Metals and Alloys - Salt Solution Immersion Tests." This experiment employed a method in which the metal specimens were cleaned in anhydrous ethanol and dried under vacuum at a constant temperature before weighing. After weighing began, three metal specimens were selected and weighed multiple times on a high-precision electronic analytical balance 600 with an accuracy of 0.01 mg. Three weight values ​​were recorded until a difference of less than 0.05 mg was achieved. The average of these three weight values ​​was then taken as the weighing result.

[0097] The connection between the pressure cover 112 and the cylinder of the experimental vessel is secured solely by bolts. However, during the experiment, the internal pressure is extremely high and must be maintained for an extended period. This requires a stable connection between the pressure cover 112 and the cylinder, with bolts tightened to prevent looseness. This ensures that there are no gaps between the pressure cover 112 and the cylinder, and that none of the edges lift during the experiment.

[0098] According to actual engineering experience, in experiments, when tightening bolts, two bolts that are symmetrical with the center of a circle should be regarded as a group. After each group is tightened, the next group should be tightened to ensure that the heights of both ends of the pressure cover 112 are basically consistent.

[0099] According to Item 5.1 of GB / T19291-2003, "Corrosion Testing of Metals and Alloys: General Principles," "Describe the state of the corrosive medium provided." Therefore, the test container should minimize the amount of contaminating corrosive media. Before adding the corrosive media (i.e., fire extinguishing agent), the test container should be dry and free of water. In this experiment, after the metal specimen is placed in the test container, the water in the container must be removed as soon as possible to prevent water corrosion.

[0100] The experimental container was dehydrated by heating it and then passing dry nitrogen through it to remove moisture. During the experiment, nitrogen was dried by connecting the nitrogen bottle's gas line to a drying tube. The container was first dried by passing dry nitrogen through it for 2-3 minutes. The container was then placed in a constant temperature and humidity chamber (120°C) and heated to 90°C. Dry nitrogen was then passed through it again for 1-2 minutes to ensure the experimental environment was essentially free of water and filled with nitrogen.

[0101] To add fire extinguishing agent, a peristaltic pump 500 is used to pump the gaseous or liquid fire extinguishing agent from the cylinder into the test vessel. Due to internal pressure fluctuations and initial flow instability, it is not recommended to use flow rate as a guide for the pumped amount. Instead, the required mass can be calculated based on the density of the fire extinguishing agent, and the amount added can be determined by the change in the balance 600 reading. According to Item 6.1 of GB / T19291-2003, "Corrosion of Metals and Alloys - General Principles of Corrosion Testing," which states that "the corrosive medium should be present in sufficient quantity, expressed as a ratio of solution volume to specimen surface area; generally, this ratio should be no less than 10 ml / cm²," the calculated pumped amount of fire extinguishing agent for simultaneous testing of 25 metal specimens should be no less than 720 ml.

[0102] Reference Figure 12 As shown, the method of adding low boiling point fire extinguishing agent is as follows:

[0103] 1. Place the fire extinguishing agent cylinder 200200 and the experimental container in a refrigerator 300 set at a temperature lower than the boiling point of the fire extinguishing agent for 30 minutes;

[0104] 2. The fire extinguishing agent is clamped upside down on the bracket 400;

[0105] 3. Vacuum the experimental container;

[0106] 4. Peristaltic pump 500 pumps in the fire extinguishing agent;

[0107] 5. Record the changes in the weighing value of the balance 600 when the fire extinguishing agent is exported;

[0108] 6. Use the density formula to determine that the amount of fire extinguishing agent added exceeds 700ml.

[0109] The method for adding high boiling point fire extinguishing agent omits step 1 above, and the remaining steps remain unchanged.

[0110] For high boiling point (boiling point greater than room temperature) fire extinguishing agents, you can use Figure 13 The low-temperature static step in the low-boiling point fire extinguishing agent filling method is omitted.

[0111] According to Item 5.7 of JB / T7901-2001 “Metal Materials Laboratory Uniform Corrosion Full Immersion Test Method”, “If dissolved oxygen needs to be eliminated, inert gas (nitrogen, etc.) can be introduced.” Nitrogen was used as the deoxygenation and pressurization gas in the experimental container.

[0112] Nitrogen must be dried through a molecular sieve drying tube before being introduced into the experimental vessel. This process must be repeated twice during the experiment: once after the experimental vessel is assembled, low-pressure nitrogen must be introduced for 2-3 minutes to dry the interior of the vessel and remove all water and oxygen. Once again, after the fire extinguishing agent is added, high-pressure nitrogen must be introduced to stabilize the internal pressure at 4.2 MPa. All pressure values ​​are read from the pressure gauge connected to the experimental vessel.

[0113] According to the project requirements, the experiment required six cycles of high and low temperature alternation, with the high temperature at 50°C and the low temperature at 0°C; and one cycle of maintaining the normal temperature at 25°C. Therefore, the ambient temperature for adding fire extinguishing agent and nitrogen in the experiment should be at normal temperature (25°C) to reduce errors.

[0114] Note: Each experimental cycle is 24 hours.

[0115] The experimental gas was stored in a 1L aluminum foil gas storage bag.

[0116] After the experiment, connect the gas storage bag to the experimental container and open the gas storage bag valve to allow the experimental gas to enter. When the gas storage bag is full and there is no obvious rebound when pressed, close the valve to complete the experimental gas collection. Before closing the gas storage bag valve, close the gas outlet valve of the experimental container first to prevent the experimental gas from breaking through the gas storage bag.

[0117] The fire extinguishing agents used in the experiment are relatively unstable. Some of them will photolyze, some have boiling points below zero, and some are volatile. Therefore, the storage of fire extinguishing agents should be handled with caution.

[0118] According to the above characteristics of the fire extinguishing agent, the residual liquid after the experiment should be collected in a brown glass bottle and placed in a sealed barrel. The sealed barrel should be stored at -20℃ (lower than the boiling point of the fire extinguishing agent in the residual liquid).

[0119] After the experiment, a large amount of fire extinguishing agent adhered to the inner wall of the experimental container. According to Item 5.1 "General Requirements for Cleaning" in HG / T2387-2016 "Quality Standard for Chemical Cleaning of Industrial Equipment", the default chemical cleaning method for stainless steel equipment is acid cleaning. In order to clean it thoroughly, stainless steel cleaning agent (acidic) can be used to clean the experimental container.

[0120] To reduce the corrosion effects of stainless steel cleaning agents on the experimental containers, this experiment used an alkaline ionized water cleaning solution and anhydrous ethanol for a secondary cleaning after using the stainless steel cleaning agent. After the above cleaning steps were completed, the experimental containers were dried using molecular sieves before storage.

[0121] According to Item 2.1.3 of GB / T16545-2015, "Corrosion of Metals and Alloys - Removal of Corrosion Products from Corrosion Specimens," which states, "Regardless of the method used, repeated cleaning is required to ensure complete removal of corrosion products." After the corrosion experiment, a combination of chemical immersion and mechanical treatment is used to completely remove corrosion products. Only then can the clean metal specimens be weighed to determine their post-experimental weight. The cleaning solutions for each metal specimen are shown in Table 1, "Chemical Cleaning Methods for Removal of Corrosion Products." A blank test is required for corrosion product removal.

[0122] Table 1 Cleaning solutions for corrosion products of 5 metal specimens

[0123] Metal materials solution Time / min Temperature / ℃ 304 stainless steel <![CDATA[500 ml of phosphoric acid (H3PO4, ρ = 1.70 g / ml), diluted with distilled water to make 1000 ml of solution]]> 60 20~25 Q235 carbon steel <![CDATA[1000 ml of hydrochloric acid (HCl, ρ = 1.19 g / ml), 20 g of antimony trioxide (Sb2O3), 50 g of tin chloride (SnCl2)]]> 1~25 20~25 6061 aluminum alloy <![CDATA[50 ml of phosphoric acid (H3PO4, ρ = 1.69 g / ml), 20 g of chromium trioxide, and distilled water are made up to 1000 ml of solution]]> 5~10 80 H59 brass 50g sulfamic acid, add distilled water to make 1000ml solution 5~10 20~25 T2 copper 50g sulfamic acid, add distilled water to make 1000ml solution 5~10 20~25

[0124] The experimental steps currently being implemented are:

[0125] 1. Process the metal samples and number them, then weigh and record the weight of each metal sample according to the number;

[0126] 2. Mount the metal specimens on the rack with the holes at a height of approximately 70 mm (the metal specimens should be >2 mm from the bottom of the container). The number of each metal specimen mounted should be no less than 5.

[0127] 3. Place the bracket into the cylinder, making sure there is no contact between the bracket and the inner wall.

[0128] 4. Place the O-ring on the container step, then put on the cover and align the bolt holes;

[0129] 5. Tighten the bolts until they cannot be turned any further.

[0130] 6. Dry container;

[0131] 7. Place the container in a 25°C environment for 15 minutes. After removing it, tighten the bolts again to ensure that they are not loose.

[0132] 8. Add fire extinguishing agent;

[0133] 9. Add nitrogen to the container to maintain the internal pressure at 4.2 MPa;

[0134] 10. Place the container in a 25°C environment for 30 minutes to confirm that the pressure gauge reading is stable at 4.2 MPa. Then re-confirm that the bolts are tightened and not loose.

[0135] 11. Place the container horizontally in a constant temperature and humidity chamber 120°C with the pressure gauge facing the observation window.

[0136] 12. Start the constant temperature and humidity chamber at 120°C;

[0137] 13. Record the pressure gauge readings during the experiment and check the instrument every 8 hours (make sure someone is present when changes occur);

[0138] 14. After 7 days, the experiment is completed and the experimental container is removed and placed on a horizontal platform;

[0139] 15. Connect the gas outlet of the container to the gas pipe and connect it to the gas storage bag to collect the experimental gas;

[0140] 16. Dismantle the experimental container after depressurization;

[0141] 17. Take out the metal samples and place them in glass dishes according to their numbers;

[0142] 18. Remove 100ml of the remaining extinguishing agent after the experiment and reserve it in a glass bottle (if the boiling point of the extinguishing agent is too low, remove an additional bag of gas as a sample when proceeding to step 15);

[0143] 19. Take photos of the metal samples and record them;

[0144] 20. Clean the experimental container;

[0145] 21. Place the metal sample in a vacuum desiccator and dry it for 30 minutes. Ensure that the surface is dry and then vacuum pack it according to the number.

[0146] 22. Select one metal specimen for SEM+EDS testing, one metal specimen for XPS testing, and clean the corrosion products from the remaining three metal specimens. Weigh them and record the weight difference before and after the test.

[0147] 23. The gas extracted in the experiment was tested by GCMS;

[0148] 24. Summarize the results of the metal sample testing after the experiment.

[0149] According to GB / T19291-2003 "General Principles of Corrosion of Metals and Alloys" and JB / T7901-1999 "Laboratory Uniform Corrosion Full Immersion Test Method for Metal Materials", the corrosion rate calculation formula is as follows:

[0150]

[0151] Where: R is the corrosion rate, mm / a; M is the mass of the sample before the experiment, g; M1 is the mass of the sample after the experiment, g; M0 is the weight loss of the blank sample, g; S is the total surface area of ​​the sample, cm2 ; T is the experimental time, h; D is the density of the sample, kg / m 3 .

[0152] Scanning electron microscopy (SEM) was used to determine the corrosion morphology; energy dispersive spectroscopy (EDS) was used to monitor the elemental distribution of corrosion products on the metal sample surface; X-ray photoelectron spectroscopy (XPS) was used to determine the composition of corrosion products on the metal sample surface; and gas chromatography / mass spectrometry (GC / MS) was used to analyze the gaseous and liquid phase products during the corrosion process. These test results, along with the corrosion rate, constitute the test results of the gas fire extinguishing agent's corrosion characteristics on the metal material of the storage container.

[0153] The above descriptions are merely some preferred embodiments of the present disclosure and illustrate the underlying technical principles. Those skilled in the art should understand that the scope of the invention encompassed by the embodiments of the present disclosure is not limited to technical solutions formed by specific combinations of the aforementioned technical features. It also encompasses other technical solutions formed by any combination of the aforementioned technical features or their equivalents, without departing from the aforementioned inventive concept. For example, a technical solution formed by replacing the aforementioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A gas fire extinguishing agent storage performance test system, characterized in that: The gas fire extinguishing agent storage performance testing system includes: Glass container for holding the extinguishing agent and metal specimen to be tested; A pressure vessel, used to contain the glass container and a pressure medium; a constant temperature and humidity chamber, used to accommodate the pressure vessel and simulate the test environment; A detection device is used to detect the corrosion degree of the metal sample in the glass container.

2. The gas fire extinguishing agent storage performance testing system according to claim 1, characterized in that: The gas fire extinguishing agent storage performance testing system also includes: Pressure detection device, used to detect the pressure inside the pressure vessel.

3. The gas fire extinguishing agent storage performance testing system according to claim 2, characterized in that: The gas fire extinguishing agent storage performance testing system also includes: A controller, used for controlling the constant temperature and humidity chamber; Wherein, the pressure detection device is electrically connected to the controller, so that the controller controls the constant temperature and humidity chamber according to the pressure detection device.

4. The gas fire extinguishing agent storage performance testing system according to claim 3, It is characterized in that Wherein, the pressure vessel comprises: A pressure cylinder is formed with a pressure chamber; a pressure sealing cover for sealing the pressure chamber; A fixing bolt is used to fix the pressure cover to the pressure cylinder.

5. The gas fire extinguishing agent storage performance testing system according to claim 4, characterized in that: in, The pressure vessel comprises: a pressure sensor, disposed between the pressure cover and the pressure cylinder to detect the pressure therebetween; The pressure sensor is in communication with the controller, so that the controller controls the temperature change of the constant temperature and humidity chamber according to the pressure sensor.

6. A method for testing the storage performance of a gas fire extinguishing agent, characterized in that: This is achieved by the gas fire extinguishing agent storage performance testing system according to claim 1; The gas fire extinguishing agent storage performance testing method comprises the following steps: placing the metal sample into the glass container; placing the glass container containing the metal sample into a pressure vessel and sealing the pressure vessel; Placing the pressure vessel into the constant temperature and humidity chamber for storage according to a preset process; The detection device is used to detect the metal sample in the pressure vessel that has completed the preset process of preservation in the constant temperature and humidity box.

7. The method for testing the storage performance of a gas fire extinguishing agent according to claim 6, characterized in that: The gas fire extinguishing agent storage performance testing system also includes: A pressure detection device for detecting the pressure in the pressure vessel; The gas fire extinguishing agent storage performance testing method further comprises the following steps: Pressurized gas is injected into the pressure container to make the interior of the pressure container have a preset pressure.

8. The method for testing the storage performance of a gas fire extinguishing agent according to claim 7, characterized in that: The gas fire extinguishing agent storage performance testing system also includes: A controller, used for controlling the constant temperature and humidity chamber; Wherein, the pressure detection device is electrically connected to the controller, so that the controller controls the constant temperature and humidity chamber according to the pressure detection device; The gas fire extinguishing agent storage performance testing method further comprises the following steps: The controller fine-tunes the temperature of the constant temperature and humidity chamber according to the pressure detected by the pressure detection device.

9. The method for testing the storage performance of a gas fire extinguishing agent according to claim 8, It is characterized in that Wherein, the pressure vessel comprises: A pressure cylinder is formed with a pressure chamber; a pressure sealing cover for sealing the pressure chamber; A fixing bolt, used for fixing the pressure cover to the pressure cylinder; The gas fire extinguishing agent storage performance testing method further comprises the following steps: After the glass container is placed in the pressure cylinder, the pressure seal is fixed with the fixing bolts.

10. The method for testing the storage performance of a gas fire extinguishing agent according to claim 9, wherein: in, The pressure vessel comprises: a pressure sensor, disposed between the pressure cover and the pressure cylinder to detect the pressure therebetween; The pressure sensor is in communication with the controller, so that the controller controls the temperature change of the constant temperature and humidity chamber according to the pressure sensor. The gas fire extinguishing agent storage performance testing method further comprises the following steps: The controller adjusts the temperature of the constant temperature and humidity chamber according to the pressure signal of the pressure sensor.

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