A fire extinguishing concentration test device and method for organic liquid fire extinguishing agent

Abstract

The present invention discloses an organic liquid fire extinguishing agent fire extinguishing concentration test device and test method, the fire extinguishing concentration test device comprises: an air supply device, providing two air passages, the first air passage is connected to the liquid fire extinguishing agent storage module, so that the first air can enter the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module to bubble, and the second air passage is connected to the combustion module; the liquid fire extinguishing agent storage module is connected to the buffer module, so that the first air enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module to bubble, and then carries the fire extinguishing agent into the buffer module; the buffer module makes the liquid fire extinguishing agent carried in the first air condense and collect in the buffer module, and the mixed gas of the air and the gaseous fire extinguishing agent is adjusted by the first regulating valve and mixed with the second air and enters the combustion module; the combustion module is used to measure the fire extinguishing concentration of the fire extinguishing agent. The present invention has the advantages of stable flow, good repeatability, simple operation, accurate measurement, etc.

Description

Technical Field

[0001] The invention relates to fire extinguishing agent fire extinguishing concentration detection, in particular to an organic liquid fire extinguishing agent cup type fire extinguishing concentration test device and a test method. Background Art

[0002] According to my country's national standards, ISO international standards and the US NFPA standards, fire extinguishing agents can be divided into three states: gas, liquid and solid. Among them, gas fire extinguishing agents are the most widely used and occupy the vast majority of the market. With the continuous improvement of the requirements of international environmental protection organizations, the demand for the development of environmentally friendly and clean fire extinguishing agents is becoming more and more urgent. Fluorinated ketone and fluorinated olefin fire extinguishing agents are expected to replace existing HCFCs and HFCs because they do not damage the ozone layer (ODP = 0), have a low greenhouse effect (GWP < 150), have low toxicity, no residue after extinguishing the fire, are green and environmentally friendly, and are easy to store. In recent years, they have begun to attract the attention of the international community.

[0003] The evaluation of the fire extinguishing performance index of the fire extinguishing agent is an important parameter to measure the fire extinguishing performance of the fire extinguishing agent, and it also provides basic data and technical support for the design of the actual engineering fire extinguishing system. Therefore, it is very necessary to test the fire extinguishing concentration of the fire extinguishing agent scientifically, accurately, concisely and quickly. At present, the cup-type fire extinguishing burner test device is usually used to test the fire extinguishing concentration of gas fire extinguishing agents at home and abroad. It can refer to ISO 14520-1-2006 and GB / T 20702 standards, but it can only test the fire extinguishing agent that is gaseous at room temperature. For organic liquid fire extinguishing agents, such as the newly developed fluorinated ketones and fluorinated olefins, etc., due to their relatively high boiling points, they are liquid at room temperature and pressure, and cannot be measured based on the existing cup-type burner test device and test method. Therefore, it is urgent to develop a cup-type fire extinguishing concentration test device and test method suitable for organic liquid fire extinguishing agents.

[0004] In order to accurately determine the cup-type fire extinguishing concentration of such organic liquid fire extinguishing agents, such as perfluoro-2-methyl-3-pentanone, 2-bromo-3,3,3-trifluoroolefin and other fire extinguishing agents, the prior art has made the following efforts:

[0005] Chinese patents CN104749331A and CN106823227A respectively report on the critical fire extinguishing concentration test method and test device of this type of organic liquid fire extinguishing agent. The test technical principles provided by the two patent methods are consistent, that is, the liquid fire extinguishing agent is completely vaporized in different ways and then mixed with air for measurement. One method uses heating to vaporize the liquid fire extinguishing agent, and the other uses an evaporator to quickly vaporize the liquid fire extinguishing agent. However, the vaporization methods of the above two fire extinguishing agents both have the problem of insufficient supply of vaporized gaseous fire extinguishing agent, resulting in unstable fire extinguishing agent gas path flow, uneven gas path temperature control, etc., resulting in poor repeatability and low accuracy of the test results of the fire extinguishing concentration.

[0006] Therefore, it is necessary to redesign the cup-type fire extinguishing concentration test device and test method for organic liquid fire extinguishing agents, adopt new design ideas and concepts, and solve the problems of uneven concentration and unstable flow of such organic liquid fire extinguishing agents after vaporization from the source. Summary of the invention

[0007] The purpose of the present invention is to provide an organic liquid fire extinguishing agent fire extinguishing concentration test device and test method, which can accurately measure the cup-type fire extinguishing concentration, and the detection gas path flow is stable, the detection result has good repeatability and high accuracy, and the operation is simple, fast and efficient.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] An organic liquid fire extinguishing agent fire extinguishing concentration test device, the fire extinguishing concentration test device comprising:

[0010] An air supply device, wherein the air supply device provides two air passages, a first air passage is connected to the liquid fire extinguishing agent storage module so that the first air can enter the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module for bubbling, and a second air passage is connected to the combustion module;

[0011] The liquid fire extinguishing agent storage module is connected to the buffer module, so that the first air path enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module, bubbles, and then carries the fire extinguishing agent into the buffer module;

[0012] The buffer module allows the liquid fire extinguishing agent carried in the first air path to condense and collect in the buffer module, and the mixed gas of the air and the gaseous fire extinguishing agent is regulated by the first regulating valve and mixed with the second air path and enters the combustion module. The buffer module includes a buffer tank and a constant temperature cooler;

[0013] A combustion module is used to measure the fire extinguishing concentration of the fire extinguishing agent.

[0014] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, the liquid fire extinguishing agent storage module includes a liquid fire extinguishing agent storage container and a heater for heating the liquid fire extinguishing agent.

[0015] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, the air supply device is divided into two air passages by a first three-way pipe fitting, the second air passage and the first air passage at the outlet of the first regulating valve are merged through a second three-way pipe fitting, and a second regulating valve and a first gas mass flow meter are provided between the first three-way pipe fitting and the second three-way pipe fitting.

[0016] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, optionally, the heater adopts a constant temperature water bath heater to control the temperature of the liquid fire extinguishing agent storage module to be higher than the temperature of the buffer module but lower than the boiling point of the fire extinguishing agent.

[0017] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, the temperature of the liquid fire extinguishing agent storage module is 20° C. to 40° C. higher than the temperature of the buffer module.

[0018] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, optionally, the constant temperature cooler adopts a constant temperature water bath cooler, so that the saturated vapor pressure concentration of the fire extinguishing agent at the temperature of the buffer module is greater than the fire extinguishing concentration.

[0019] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, the air supply device includes an air storage container, a first stop valve and a pressure reducing valve connected in sequence.

[0020] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, a second gas mass flow meter and a second stop valve are provided on the pipeline between the first three-way pipe fitting and the liquid fire extinguishing agent storage module.

[0021] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, the liquid fire extinguishing agent storage container is provided with a liquid filling valve and a liquid discharge valve to facilitate the addition and discharge of the liquid fire extinguishing agent.

[0022] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, the buffer module includes a first buffer tank and a second buffer tank, and the inlet of the first buffer tank is a serpentine coil.

[0023] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, preferably, both the first buffer tank and the second buffer tank are provided with a drain valve.

[0024] The present invention also provides a fire extinguishing concentration test method for any of the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test devices, the fire extinguishing concentration test method comprising the following steps:

[0025] (A1) The air supply device provides two air paths. The first air path enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module to bubble, and then carries the fire extinguishing agent into the buffer module to condense and collect the liquid fire extinguishing agent. The mixed gas of the first air path and the gaseous fire extinguishing agent is mixed with the second air path and then enters the combustion module;

[0026] (A2) adjusting the gas flow rate of the first channel so that the flame in the combustion module is just extinguished;

[0027] (A3) Collecting the gas in the combustion module when the flame is extinguished, and analyzing the volume fraction of the fire extinguishing agent in the collected gas, i.e., the fire extinguishing concentration, by headspace gas chromatography-external standard method.

[0028] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test method, preferably, the fire extinguishing agent concentration at the gas outlet of the first buffer module is controlled within 2 minutes with a deviation of no more than 0.2% to improve the stability and accuracy of the test results.

[0029] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test method, preferably, the fire extinguishing concentration test method also includes the following steps:

[0030] (B1) turning on the heater of the liquid fire extinguishing agent storage module and the constant temperature cooler of the buffer module, controlling the temperature of the liquid fire extinguishing agent storage module to be 20-40° C. higher than the temperature of the buffer module, the maximum temperature of the liquid fire extinguishing agent storage module being lower than the boiling point of the fire extinguishing agent, and the saturated vapor pressure concentration of the fire extinguishing agent in the buffer module being greater than the fire extinguishing concentration at its temperature;

[0031] The step (B1) is located before the step (A1).

[0032] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test method, preferably, the fire extinguishing concentration test method also includes the following steps:

[0033] (C1) Adjust the gas flow rate of the second path, repeat steps (A2) and (A3), obtain the fire extinguishing concentration under different air flow rates, and take the average value as the fire extinguishing concentration.

[0034] According to the above-mentioned test method for the fire extinguishing concentration of organic liquid fire extinguishing agent, preferably, the headspace gas chromatography-external standard method for analyzing the fire extinguishing concentration comprises the following steps:

[0035] (D1) Prepare standard fire extinguishing agents of different volume concentrations: Calculate the preparation amount according to the temperature and pressure during the experiment and add a mass m of liquid fire extinguishing agent to a volume V. 0 In the standard air bag, fully gasify the liquid fire extinguishing agent in the air bag, use a pneumatic pump to extract standard gases of different concentrations into the headspace bottle, and seal it after full replacement;

[0036] (D2) drawing external standard curves of fire extinguishing agent standards of different volume concentrations: analyzing the fire extinguishing agent standards of different volume concentrations collected in step (D1) by headspace gas chromatography, and drawing external standard curves based on peak area and fire extinguishing agent volume concentration;

[0037] (D3) Determination of the extinguishing concentration of liquid fire extinguishing agent: The gas in the combustion module when the extinguishing point is reached is collected in a headspace bottle in the same sampling method as the standard product. After full replacement, the gas is sealed and the extinguishing concentration is determined by headspace gas chromatography external standard method.

[0038] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test method, optionally, in the step (D1), the prepared fire extinguishing agent standard product has different volume concentrations ranging from 1% to 10%, and the standard air bag volume V 0 Select any one of 2L, 3L, and 5L, and the sampling replacement time is 30 to 60s.

[0039] According to the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test method, preferably, the mass m of the added liquid fire extinguishing agent is calculated according to the following formula (I):

[0040]

[0041] Where: m is the mass of liquid fire extinguishing agent, in g;

[0042] P is the pressure during the experiment, in KPa;

[0043] V 0 is the standard air bag volume, unit L;

[0044] V S is the volume concentration of the standard fire extinguishing agent, in %;

[0045] R is the gas constant, which is 8.314 and is expressed in J / (mol·K);

[0046] T is the temperature during the experiment, in K;

[0047] M is the molar mass of the liquid fire extinguishing agent, in g / mol.

[0048] According to the above-mentioned test method for the fire extinguishing concentration of organic liquid fire extinguishing agent, preferably, the correlation coefficient of the external standard curve of the standard drawn in step (D2) is greater than 0.995.

[0049] Compared with the prior art, the present invention has the following advantages:

[0050] (1) The present invention obtains gaseous fire extinguishing agent by air bubbling. The stable air flow enables the gaseous fire extinguishing agent to be introduced into the combustion module at a stable pressure and flow rate, thereby ensuring the uniformity of the fire extinguishing agent concentration and having good repeatability of the test results, greatly saving the test cost and improving the feasibility of the test, thus overcoming the defect that the cup burner test device in the prior art is only suitable for measuring gaseous fire extinguishing agent;

[0051] (2) The present invention collects the gas in the chimney of the combustion module when the fire extinguishing point is reached, and directly determines the concentration of the fire extinguishing agent in the gas by headspace gas chromatography-external standard method, thereby improving the accuracy of the test method. The method is simple, easy to operate, and suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic structural diagram of an organic liquid fire extinguishing agent fire extinguishing concentration test device according to Example 1 of the present invention. DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0054] Example 1

[0055] This embodiment provides a device for testing the fire extinguishing concentration of an organic liquid fire extinguishing agent. Figure 1 The structure diagram of the fire extinguishing concentration test device of this embodiment is schematically shown as follows: Figure 1 As shown, the fire extinguishing concentration test device comprises:

[0056] An air supply device 1, the air supply device comprising an air storage container 11, a first stop valve 12 and a pressure reducing valve 13 connected in sequence;

[0057] A first three-way pipe fitting 21 and a second three-way pipe fitting 22, the air provided by the air supply device is divided into two paths through the first three-way pipe fitting 21, the first path of air enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module to bubble, and the second path of air enters the combustion module through the second three-way pipe fitting 22;

[0058] A liquid fire extinguishing agent storage module, the liquid fire extinguishing agent storage module comprising a liquid fire extinguishing agent storage container 31 and a heater 32 for heating the liquid fire extinguishing agent; a first path of air enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module to bubble, and then carries the fire extinguishing agent into the buffer module;

[0059] A buffer module, the buffer module includes a first buffer tank 41, a second buffer tank 42 and a constant temperature cooler 43 for cooling the first buffer tank and the second buffer tank; the liquid fire extinguishing agent in the first path of air carrying the fire extinguishing agent is condensed and collected in the buffer module, and the mixed gas of the air and the gaseous fire extinguishing agent enters the second three-way pipe through the first regulating valve 51;

[0060] The combustion module 6 adopts a cup-type burner connected to the outlet of the second three-way pipe fitting and is used to measure the fire extinguishing concentration of the fire extinguishing agent.

[0061] Furthermore, a second regulating valve 52 and a first gas mass flow meter 71 are provided between the first three-way pipe fitting and the second three-way pipe fitting, and the fire extinguishing concentration under different air flow rates is measured by adjusting the second regulating valve.

[0062] A second gas mass flow meter 72 and a second stop valve 33 are provided on the pipeline between the first three-way pipe fitting and the liquid fire extinguishing agent storage module.

[0063] Furthermore, the heater adopts a constant temperature water bath heater to control the temperature of the liquid fire extinguishing agent storage module to be higher than the temperature of the buffer module, but lower than the boiling point of the fire extinguishing agent; preferably, the temperature of the liquid fire extinguishing agent storage module is 20°C to 40°C higher than the temperature of the buffer module.

[0064] The cooler adopts a constant temperature water bath cooler, so that the saturated vapor pressure concentration of the fire extinguishing agent at the temperature of the buffer module is greater than the fire extinguishing concentration.

[0065] Furthermore, the liquid fire extinguishing agent storage container is provided with a third stop valve 34, a liquid filling port valve 35 and a liquid discharge port valve 36 to facilitate the addition and discharge of the liquid fire extinguishing agent.

[0066] Furthermore, the inlet of the first buffer tank is a serpentine coil; the first buffer tank and the second buffer tank are respectively provided with a drain valve 44 and a drain valve 45.

[0067] This embodiment also provides a test method for the above-mentioned organic liquid fire extinguishing agent fire extinguishing concentration test device, comprising the following steps:

[0068] (B1) turning on the heater of the liquid fire extinguishing agent storage module and the constant temperature cooler of the buffer module, controlling the temperature of the liquid fire extinguishing agent storage module to be 20-40° C. higher than the temperature of the buffer module, the maximum temperature of the liquid fire extinguishing agent storage module being lower than the boiling point of the fire extinguishing agent, and the saturated vapor pressure concentration of the fire extinguishing agent in the buffer module being greater than the fire extinguishing concentration at its temperature;

[0069] (A1) Open the first stop valve, the pressure reducing valve, the second stop valve and the third stop valve, and the air provided by the air storage container is divided into two paths. The first path is bubbled into the liquid fire extinguishing agent storage container, and the liquid fire extinguishing agent in the liquid fire extinguishing agent storage container is vaporized and condensed in the first buffer tank and the second buffer tank. The extinguishing agent droplets wrapped in the gas are mixed with the second path air and then enter the cup burner; open the second regulating valve to stabilize the flow of the second path air;

[0070] (A2) adjusting the opening of the first regulating valve to adjust the flow rate of the first gas path so that the flame in the cup burner is just extinguished;

[0071] (A3) Collect the gas in the cup burner when the flame is extinguished, and analyze the volume fraction of the fire extinguishing agent in the collected gas, i.e., the fire extinguishing concentration, by headspace gas chromatography-external standard method.

[0072] In order to improve the stability of the test results, the concentration of the fire extinguishing agent at the gas outlet of the first buffer module is controlled to have a deviation of no more than 0.2% within 2 minutes.

[0073] In order to improve the accuracy of the test results, the fire extinguishing concentration is measured multiple times and the average value is taken, so:

[0074] Furthermore, the fire extinguishing concentration test method further comprises the following steps:

[0075] (C1) Adjust the gas flow rate of the second path, repeat steps (A2) and (A3), obtain the fire extinguishing concentration under different air flow rates, and take the average value as the fire extinguishing concentration.

[0076] The headspace gas chromatography-external standard method for analyzing the fire extinguishing concentration comprises the following steps:

[0077] (D1) Prepare standard fire extinguishing agents of different volume concentrations: Calculate the preparation amount according to the temperature and pressure during the experiment and add a mass m of liquid fire extinguishing agent to a volume V. 0 The liquid fire extinguishing agent in the standard air bag is fully gasified, and the standard gas of different concentrations is extracted into the headspace bottle by a pneumatic pump, and sealed after full replacement; the prepared fire extinguishing agent standard product has different volume concentrations ranging from 1% to 10%, and the volume of the standard air bag V 0 Select any one of 2L, 3L, and 5L, and the sampling replacement time is 30 to 60s;

[0078] (D2) drawing external standard curves of fire extinguishing agent standards of different volume concentrations: analyzing the fire extinguishing agent standards of different volume concentrations collected in step (D1) by headspace gas chromatography, and drawing an external standard curve based on peak area and fire extinguishing agent volume concentration, wherein the external standard curve correlation coefficient is greater than 0.995;

[0079] (D3) Determination of the extinguishing concentration of liquid fire extinguishing agent: The gas in the combustion module when the extinguishing point is reached is collected in a headspace bottle in the same sampling method as the standard product. After full replacement, the gas is sealed and the extinguishing concentration is determined by headspace gas chromatography external standard method.

[0080] The mass m of the added liquid fire extinguishing agent is calculated according to the following formula (I):

[0081]

[0082] Where: m is the mass of liquid fire extinguishing agent, in g;

[0083] P is the pressure during the experiment, in KPa;

[0084] V 0 is the standard air bag volume, unit L;

[0085] V S is the volume concentration of the standard fire extinguishing agent, in %;

[0086] R is the gas constant, which is 8.314 and is expressed in J / (mol·K);

[0087] T is the temperature during the experiment, in K;

[0088] M is the molar mass of the liquid fire extinguishing agent, in g / mol.

[0089] Example 2

[0090] An example of application of the organic liquid fire extinguishing agent fire extinguishing concentration test device of Example 1 of the present invention in testing perfluorohexanone fire extinguishing agent.

[0091] In this application example, the air storage container is an air storage cylinder, the heater is a constant temperature water bath, the cooler is a low temperature freezing water bath, and the first regulating valve and the second regulating valve are needle valves.

[0092] The outlet of the air storage cylinder is connected to the second three-way pipe fitting in sequence through the first stop valve, the pressure reducing valve, the first three-way pipe fitting, the second needle valve, the first gas mass flow meter; a second stop valve and a second gas mass flow meter are arranged between the inlet of the liquid fire extinguishing agent storage container (placed in a constant temperature water bath for heating) and the first three-way pipe fitting, and the outlet of the liquid fire extinguishing agent storage container is provided with a third stop valve and is connected to the first buffer tank (placed in a low-temperature freezing water bath), the second buffer tank (placed in a low-temperature freezing water bath), the first needle valve and the second three-way pipe fitting in sequence; the second three-way pipe fitting is connected to the cup burner.

[0093] This application example uses headspace gas chromatography to determine the fire extinguishing concentration of perfluorohexanone. First, the external standard curves of perfluorohexanone standard samples with different concentrations are obtained. The specific steps are as follows:

[0094] (1) Preparation of standard fire extinguishing agent with different volume concentrations: prepare standard samples of perfluorohexanone fire extinguishing agent with different volume concentrations respectively. The experimental temperature is 22.5°C and the pressure is normal. According to formula (I), the mass m of perfluorohexanone fire extinguishing agent (accurate to 0.1 mg) is accurately added into a standard air bag with a volume of 5 L. The liquid fire extinguishing agent in the air bag is fully gasified. The standard gas with different concentrations is extracted into the headspace bottle by a pneumatic pump. After fully replacing for 60 seconds, it is sealed.

[0095]

[0096] Where: m is the mass of liquid fire extinguishing agent, in g;

[0097] P is the pressure during the experiment, in KPa;

[0098] V 0 is the standard air bag volume, unit L;

[0099] Vs is the volume concentration of the fire extinguishing agent standard sample, in %;

[0100] R is the gas constant, which is 8.314 and is expressed in J / (mol·K);

[0101] T is the temperature during the experiment, in K;

[0102] M is the molar mass of the liquid fire extinguishing agent, in g / mol.

[0103] (2) Drawing external standard curves of perfluorohexanone fire extinguishing agent with different volume concentrations: Analyze the perfluorohexanone fire extinguishing agent standards with different volume concentrations collected in step (1) by headspace gas chromatography, and draw external standard curves based on peak area and volume concentration;

[0104] (3) Determination of the cup-type fire extinguishing concentration of perfluorohexanone fire extinguishing agent: Use the same sampling method as the standard product to collect the gas in the chimney when it reaches the fire extinguishing point in a headspace bottle, seal it after full replacement, and use the headspace gas chromatography external standard method to determine the fire extinguishing concentration.

[0105] Table 1 Preparation of standard samples of perfluorohexanone at different concentrations and drawing of external standard curves

[0106]

[0107] After obtaining the external standard curve, the organic liquid fire extinguishing agent cup-type fire extinguishing concentration test device of Example 1 of the present invention is used to measure the fire extinguishing concentration of perfluorohexanone, and the specific steps are as follows:

[0108] The first step is to place the perfluorohexanone fire extinguishing agent in a liquid fire extinguishing agent storage container, open a constant temperature water bath, and control the temperature to 40°C;

[0109] Step 2: Open the low-temperature freezing water bath and control the temperature to 8°C;

[0110] Step 3: Open the first stop valve at the outlet of the air storage cylinder, adjust the pressure reducing valve at the outlet of the cylinder to 0.5 MPa, and allow air to pass through the first three-way pipe fitting;

[0111] Step 4: Open the second needle valve and adjust the air flow rate to 10L / min to keep the reading of the first gas mass flow meter stable;

[0112] Step 5: Put ethanol fuel in the cup burner, adjust the fuel liquid level to about 1mm below the cup mouth, ignite the flame, and pre-burn for 60s;

[0113] Step 6: Open the second needle valve, the second stop valve and the third stop valve on the liquid fire extinguishing agent storage container, so that air bubbles into the liquid fire extinguishing agent storage container and then carries the fire extinguishing agent through the first buffer tank and the second buffer tank in sequence;

[0114] Step 7. Mix the first-path air, gaseous fire extinguishing agent mixture and second-path air through the second three-way pipe fitting and pass them into the cup burner. Adjust the opening of the first needle valve until the flame is just extinguished. Record the reading of the second gas mass flow meter. At the same time, turn on the pneumatic pump. Use a headspace bottle to collect the gas in the chimney of the cup burner when the flame is extinguished. Fully replace for 60s, seal, and use headspace gas chromatography-external standard method to quantitatively analyze the volume fraction of liquid fire extinguishing agent in the gas, that is, the fire extinguishing concentration.

[0115] Step 8. Increase the opening of the first needle valve and readjust the air flow rate to 20L / min, 30L / min, 40L / min, and 50L / min respectively, so that the indication of the first gas mass flowmeter remains stable for at least 60s to ensure that the new ratio of liquid fire extinguishing agent and air mixture can reach the combustion cup position. Repeat steps 5 and 7, and repeat the test three times at each air flow rate. The fire extinguishing concentration of the fire extinguishing agent is taken as the average of the three times. The specific test data are shown in Table 2 below.

[0116] Table 2 Perfluorohexanone cup extinguishing concentration test data under different air flow conditions (fuel: ethanol)

[0117]

Claims

1. An organic liquid fire extinguishing agent fire extinguishing concentration test device, characterized in that: The fire extinguishing concentration test device comprises: An air supply device, wherein the air supply device provides two air passages, a first air passage is connected to the liquid fire extinguishing agent storage module so that the first air can enter the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module for bubbling, and a second air passage is connected to the combustion module; The liquid fire extinguishing agent storage module is connected to the buffer module, so that the first air path enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module, bubbles, and then carries the fire extinguishing agent into the buffer module; The buffer module allows the liquid fire extinguishing agent carried in the first air path to condense and collect in the buffer module, and the mixed gas of the air and the gaseous fire extinguishing agent is regulated by the first regulating valve and mixed with the second air path and enters the combustion module. The buffer module includes a buffer tank and a constant temperature cooler; A combustion module is used to measure the fire extinguishing concentration of the fire extinguishing agent.

2. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 1, characterized in that: The liquid fire extinguishing agent storage module includes a liquid fire extinguishing agent storage container and a heater for heating the liquid fire extinguishing agent.

3. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 1, characterized in that: The air supply device is divided into two air passages by a first three-way pipe fitting, the second air passage and the first air passage at the outlet of the first regulating valve are merged through a second three-way pipe fitting, and a second regulating valve and a first gas mass flow meter are provided between the first three-way pipe fitting and the second three-way pipe fitting.

4. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 2, characterized in that: The heater is a constant temperature water bath heater, which controls the temperature of the liquid fire extinguishing agent storage module to be higher than the buffer module but lower than the boiling point of the fire extinguishing agent.

5. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 4, characterized in that: The temperature of the liquid fire extinguishing agent storage module is 20° C. to 40° C. higher than the temperature of the buffer module.

6. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 1, characterized in that: The constant temperature cooler adopts a constant temperature water bath cooler, so that the saturated vapor pressure concentration of the fire extinguishing agent at the temperature of the buffer module is greater than the fire extinguishing concentration.

7. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 1, characterized in that: The air supply device includes an air storage container, a first stop valve and a pressure reducing valve which are connected in sequence.

8. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 3, characterized in that: A second gas mass flow meter and a second stop valve are provided on the pipeline between the first three-way pipe fitting and the liquid fire extinguishing agent storage module.

9. The organic liquid fire extinguishing agent fire extinguishing concentration test device according to claim 1, characterized in that: The buffer module includes a first buffer tank and a second buffer tank, and the inlet of the first buffer tank is a serpentine coil.

10. The method for testing the fire extinguishing concentration of the organic liquid fire extinguishing agent fire extinguishing concentration testing device according to any one of claims 1 to 9, characterized in that: The fire extinguishing concentration test method comprises the following steps: (A1) The air supply device provides two air paths. The first air path enters the liquid fire extinguishing agent in the liquid fire extinguishing agent storage module to bubble, and then carries the fire extinguishing agent into the buffer module to condense and collect the liquid fire extinguishing agent. The mixed gas of the first air path and the gaseous fire extinguishing agent is mixed with the second air path and then enters the combustion module; (A2) adjusting the gas flow rate of the first channel so that the flame in the combustion module is just extinguished; (A3) Collecting the gas in the combustion module when the flame is extinguished, and analyzing the volume fraction of the fire extinguishing agent in the collected gas, i.e., the fire extinguishing concentration, by headspace gas chromatography-external standard method.

11. The fire extinguishing concentration test method according to claim 10, characterized in that: The fire extinguishing agent concentration at the gas outlet of the buffer module is controlled within 2 minutes so that the deviation does not exceed 0.2%.

12. The fire extinguishing concentration test method according to claim 10, characterized in that: The fire extinguishing concentration test method also includes the following steps: (B1) turning on the heater of the liquid fire extinguishing agent storage module and the constant temperature cooler of the buffer module, controlling the temperature of the liquid fire extinguishing agent storage module to be 20-40° C. higher than the temperature of the buffer module, the maximum temperature of the liquid fire extinguishing agent storage module being lower than the boiling point of the fire extinguishing agent, and the saturated vapor pressure concentration of the fire extinguishing agent in the buffer module being greater than the fire extinguishing concentration at its temperature; The step (B1) is located before the step (A1).

13. The fire extinguishing concentration test method according to claim 12, characterized in that: The fire extinguishing concentration test method also includes the following steps: (C1) Adjust the gas flow rate of the second path, repeat steps (A2) and (A3), obtain the fire extinguishing concentration under different air flow rates, and take the average value as the fire extinguishing concentration.

14. The fire extinguishing concentration test method according to claim 10, characterized in that: The headspace gas chromatography-external standard method for analyzing the fire extinguishing concentration comprises the following steps: (D1) Prepare standard fire extinguishing agents of different volume concentrations: Calculate the preparation amount according to the temperature and pressure during the experiment and add a liquid fire extinguishing agent of mass m into a standard air bag of volume V0, fully gasify the liquid fire extinguishing agent in the air bag, use a pneumatic pump to extract standard gases of different concentrations into the headspace bottle, and seal it after full replacement; (D2) drawing external standard curves of fire extinguishing agent standards of different volume concentrations: analyzing the fire extinguishing agent standards of different volume concentrations collected in step (D1) by headspace gas chromatography, and drawing external standard curves based on peak area and fire extinguishing agent volume concentration; (D3) Determination of the extinguishing concentration of liquid fire extinguishing agent: The gas in the combustion module when the extinguishing point is reached is collected in a headspace bottle in the same sampling method as the standard product. After full replacement, the gas is sealed and the extinguishing concentration is determined by headspace gas chromatography external standard method.

15. The fire extinguishing concentration test method according to claim 14, characterized in that: In the step (D1), the prepared fire extinguishing agent standard product has different volume concentrations ranging from 1% to 10%, the standard air bag volume V0 is selected from any one of 2L, 3L, and 5L, and the sampling replacement time is 30 to 60s.

16. The fire extinguishing concentration test method according to claim 14, characterized in that: The mass m of the added liquid fire extinguishing agent is calculated according to the following formula (I): Where: m is the mass of liquid fire extinguishing agent, in g; P is the pressure during the experiment, in KPa; V0 is the standard air bag volume, unit L; V S is the volume concentration of the standard fire extinguishing agent, in %; R is the gas constant, which is 8.314 and is expressed in J / (mol·K); T is the experimental temperature, in K; M is the molar mass of the liquid fire extinguishing agent, in g / mol.

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