TWI532988B - Detection method of foam liquid concentrates - Google Patents

Description

Foam stock detection method

The invention relates to a method for detecting a foam stock solution, in particular to a method for detecting a foam stock solution performed by an electrochemical alternating current impedance analyzer.

Many vehicles (locomotives and cars) are parked in the parking lot. Since the structure of the vehicle itself is mostly flammable, such as fuel, seats, rubber tires, various decorative fabrics and on-board goods, in the event of a fire, the burning speed is fast and the burning is carried out. Rapidly, the smoke and heat generated by these combustions often cause a large number of human casualties and property losses. In order to reduce the expansion of vehicle combustion, the parking lot shall be provided with a foam fire extinguishing system to increase the immediate fire extinguishing time to increase the probability of successful personnel escape. A foam is a kind of water filled with air bubbles. Its density is lower than that of a flammable liquid. When it is emitted through a foam fire extinguishing system, it will cover the surface of the burning object, which will prevent oxygen from continuing to be supplied to the burning object and then burn. Stopping, because the foam does not easily escape, it is also particularly effective for oil (B) fires.

The foam stock solution is usually placed in a solution storage tank separately, and then pumped from a foam nozzle by a pump and a water pipe in a foam fire extinguishing system to form a foam. Therefore, the quality of the foam stock solution can not be taken seriously after the foam is emitted, whether it has sufficient expansion ratio and whether it will be shattered too early to become water, and cannot cover the surface of the fire object and the protective article.

The detailed composition ratio of the foam stock solution is regarded as the trade secret of the manufacturer, and the general users have no way of knowing it. There is no simpler and quicker method to immediately know the performance of the foam stock solution. Currently, it can only be provided by the seller. Written information is reviewed. Take Taiwan as an example. Commercially available foam stocks are usually used after being approved by the administrative authorities. Applicants must attach foreign inspection standards and inspection certificates. Although the sellers claim to be imported in barrels, some are large. Imports are then repackaged into the bucket, but either way, as long as it is provided by the seller When the content is different, it is impossible to know whether the quality is the same as the written information provided on the spot.

At present, the quality control of the foam stock solution is to spray the foam stock solution through the spray head, and then collect the sprayed foam for testing, and the foaming condition can be confirmed through the actual radiation foaming procedure. However, the actual radiation foam requires a lot of manpower. It takes a lot of time to prepare, emit and clean up the aftermath. The most time-consuming and inconvenient is that all the vehicles in the radiation area have to be removed, which takes considerable time, money and manpower. The liquid emitted will also cause environmental pollution. Therefore, the present invention hopes to develop a simpler, correct, effective and economical alternative method for testing foam stocks, providing random inspections by government departments, regular maintenance of fire-fighting equipment professional technicians, self-maintenance inspections by owners and maintenance personnel of the venues, or school institutions, Professional testing organizations substitute new methods for testing to save time and resources.

In view of the above-mentioned problems of the prior art, the object of the present invention is to provide a foam stock solution detection method using an electrochemical AC impedance analyzer, in order to replace the current foam test method, thereby achieving the effects of saving money, time and manpower. .

According to the object of the present invention, a foam stock solution detecting method is provided, which comprises the steps of: placing a foam stock solution in a solution storage tank; disposing a metal diode in the solution storage tank; and connecting an electrochemical AC impedance analyzer to the solution a metal diode, which outputs voltage and current to the foam stock solution for ion-ion migration, and further measures various other relative information such as the admittance frequency of the bubble stock solution through the electrochemical AC impedance analyzer; The actual radiating portion of the foam, the pressurizing motor is activated to spray the foam stock solution through a foaming nozzle; and the sprayed foam is collected by a measuring cylinder for a predetermined amount, and the code table is pressed to calculate the foaming magnification of the foam and 25% reduction time; comparison of various relative information such as admittance frequency and expansion ratio and 25% reduction time, determine the admittance frequency or related information that is qualified for the expansion ratio and 25% reduction time to generate admittance frequency or correlation One of the information can accept a curve or data and store the acceptable curve or data in a database; and a cleaning solution storage tank, Place another foam stock solution of the same brand or unknown brand into the solution storage tank, and measure the admittance frequency curve and various relative information of the other foam stock solution by using an electrochemical impedance analyzer, and then according to the acceptable curve or data To judge whether the foaming ratio of another foam stock solution and the 25% reduction time are qualified or not.

Preferably, the foam stock solution detecting method of the present invention further comprises the following steps Step: Electrochemical AC impedance analyzer measuring part, placing water in the solution storage tank, and stirring and mixing with the foam stock solution.

Preferably, the foam stock solution detecting method of the present invention further comprises the steps of: placing water in the solution storage tank in the actual radiation portion of the foam of the foam fire extinguishing system, and stirring and mixing with the other foam stock solution.

Preferably, the predetermined amount is 1000 ml or other suitable amount.

Preferably, the pressurizing pressure of the pressurizing motor is 6.0 kgf/cm ² or other pressure.

Preferably, the excitation voltage of the electrochemical AC impedance analyzer is set to 0.02V or other testable voltage, and the set frequency is 1HZ to 100KHZ or other testable frequency, and the data is recorded every 50 points or other testable points. .

Preferably, the solution storage tank can be made of steel or other materials.

The method for detecting a foam stock solution according to the object of the present invention is to place a foam stock solution in a solution storage tank, and to provide a conductive diode plate in the solution storage tank, and connect the conductive diode plate to an electrochemical alternating current impedance analysis. The instrument outputs voltage and current to the foam stock solution for ion-ion migration, and further measures various other relative information such as the admittance frequency of the foam stock solution through the electrochemical AC impedance analyzer, and performs foaming of the foam stock solution. Radiation, to observe the record expansion ratio and foam reduction, and compare the relative information such as the admittance frequency with the expansion ratio and the foam reduction, to determine the admittance frequency or the correlation of the foaming ratio and the foam reduction. Information to generate an acceptable curve or data for an admittance frequency or related information.

According to the above, the foam stock solution of the foam tank in the foam fire extinguishing system can be measured by an electrochemical AC impedance analyzer to measure whether the foam can be used continuously, instead of the current actual radiation foam detection method, to supply the government department and the fire fighting equipment. Professional and technical personnel, site owners, maintenance personnel, school institutions and professional testing organizations to use, so that the testing unit can save a lot of time, money and manpower.

S11~S17‧‧‧Steps

Fig. 1 is a flow chart showing the method for detecting a foam stock solution of the present invention.

Figure 2 is a graph showing the relationship between frequency and admittance of (A) brand foam stock at different concentrations.

Figure 3 is a diagram showing the frequency and admittance diagram of foam stocks of various brands.

The technical features, contents, and advantages of the present invention, as well as the advantages thereof, can be understood by the present inventors, and the present invention will be described in detail with reference to the accompanying drawings. The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

Please refer to FIG. 1 , which is a flow chart of a method for detecting a foam stock solution according to the present invention. The process steps include: Step S11: measuring a portion of the electrochemical AC impedance analyzer, and placing the foam stock solution in a solution storage tank; Step S12: Providing a metal diode in the solution storage tank; Step S13: connecting an electrochemical AC impedance analyzer to the metal diode to output a voltage and current to the foam stock solution for ion-ion migration, and then passing the electrochemical The AC impedance analyzer measures various other relative information such as the admittance frequency of the bubble stock solution; step S14: in the actual radiating portion of the foam of the foam fire extinguishing system, start a pressurizing motor to spray the foam stock solution through a foam nozzle And step S15: collecting the sprayed foam by a measuring cylinder for a predetermined amount, and pressing the code table to calculate the foaming magnification of the foam and the 25% reduction time.

Step S16: comparing the relative information such as the admittance frequency with the expansion ratio and the 25% reduction time, and determining the admittance frequency or related information that is qualified for the expansion ratio and the 25% reduction time to generate the admittance frequency or related information. Accept an curve or data and store the acceptable curve or data in a database.

Step S17: cleaning the solution storage tank, and placing another foam stock solution of the same brand or unknown brand into the solution storage tank, and measuring the admittance frequency curve and various relatives of the other foam stock solution by using an electrochemical impedance analyzer. Information, and then based on the acceptable curve or data to determine the foaming rate of another foam stock solution and 25% reduction time pass or not.

In the above, in the step S11 and the step S17 of the method for detecting the foam stock solution of the present invention, the water is placed in a solution storage tank and placed in a foam stock solution of the same brand or an unknown brand. Stir and mix.

In the above, the predetermined amount may be 1000 ml or other suitable amount, and the pressurizing pressure of the pressurizing motor is 6.0 kgf/cm ² or other pressure.

The invention is the first in the world to measure the foam stock using an electrochemical AC impedance analyzer. Electrochemical AC impedance analyzers have been successfully used to detect the concentration of milk in the past. They are also used to analyze the interface behavior of metal materials, battery testing studies, and admittance values of apolysiloxane film to organic vapours. Research, even used to measure the internal saturation of concrete fine aggregates. The application of the instrument has become more and more extensive, and all have obtained good academic results, especially in the application of biomedicine. Therefore, the application of electrical impedance should be a reliable measurement method. However, no one has used this method to study the quality control of foam stocks.

In the above, an example of the operation is as follows. Other instruments, materials, voltages, frequencies, points, sample volumes, waiting time, and related data and graphics data of different specifications are used to test related information. It is within the scope of the invention. The test environment temperature for the stability measurement is 25 ° C. The solution storage tank is a rectangular three-dimensional groove with an acrylic thickness of 4.94 mm, the inner length of the tank is 12.4 cm, the inner width is 7.7 cm and the inner side. The height is 8.0cm. Two plates of white iron metal plate are provided on the two sides of the solution storage tank, and the thickness is 1.18 mm, the length is 10.0 cm, and the width is 7.8 cm. One of the plates is connected to the AC impedance analyzer using two separate shielded coaxial cables for voltage and current output and data input. The excitation voltage of the electrochemical AC impedance analyzer is set to 0.02V, and the set frequency is 1HZ to 100KHZ to record data every 50 points. The AC Impedance Analyzer is connected to the notebook via the EIA-RS-232 connector for test control and data logging. After the volume of the foam solution sample was 50 ml, it was allowed to stand for about 5 minutes until the liquid level was stable, and then the "frequency-admittance" relationship pattern was measured.

In the above, an example is given to illustrate the process. It is also within the scope of the present invention to use other types of foam stocks, obtained related data, figures, materials, etc., using the present invention to test related materials. For the AC impedance test, each concentration is uniformly mixed with new water and mixed with water, and then tested separately. In the first stage, (A) the AC impedance analysis of various concentrations of the brand is first carried out. (A) The relationship between the frequency of various concentrations of the brand (1 Hz to 100 kHz) and the admittance is shown in Fig. 2, and it is found in any concentration case. When the frequency is about 100Hz, the slope (admittance ÷ frequency) is very different. The slope of the foam stock solution is the largest when no water is added. The slope of the liquid is minimized when diluted by water. The relative admittance value of 100% sputum solution at 100KHz is 0.02106S, the relative admittance value of 90% sputum solution at 100KHz is 0.01929S, and the relative admittance value of 80% sputum solution at 100KHz is 0.01719S, 60%. The relative admittance value of the stock solution at 100KHz is 0.01273S, the relative admittance value of 40% foaming stock solution at 100KHz is 0.008790S, and the relative admittance value of 20% foaming stock solution at 100KHz is 0.004301S, for example, 100% foaming stock solution. The relative admittance value at 100KHz is about 40% of the relative admittance value of the bubble solution at 100KHz (0.02106÷0.008590=2.45), and the relative admittance value of the 100% bubble solution at 100KHz is about 20%. The relative liquid admittance value of the original solution is 5 times (0.02106 ÷ 0.004301 = 4.90) at 100KHz. After the frequency is from 100Hz to 100KHz, the slope of various concentrations (admittance ÷ frequency) is 100%, 90%, 80%, 60%, 40. The % and 20% are sequentially measured as 0.0000000038, 0.0000000029, 0.0000000024, 0.0000000011, 0.000000005, 0.000000001, and the slopes are all close to 0, that is, the state in which the horizontal line is present, the difference being the difference in the admittance value.

In the above, an example is given to illustrate the process. It is also within the scope of the present invention to use other types of foam stocks, obtained related data, figures, materials, etc., using the present invention to test related materials. When the liquid is inserted into a pair of electrodes, after energization, under the action of the electric field, the charged ions move in a certain direction, the anions in the water move toward the anode, and the cations move toward the cathode, causing the liquid to conduct electricity. Therefore, the 100% foam stock has the highest electrical conductivity. When the proportion of water is increased, the conductivity of the 20% foam stock is the lowest due to the dilution of the foam stock. In the second stage, AC impedance analysis of three different brands is carried out. The relationship between the frequency of various brands (1Hz to 100KHz) and admittance is shown in Figure 3. The relationship between the three brands (A) and (B) is obvious. Differences, the slopes of various brands before the frequency of about 100Hz (admittance ÷ frequency) are different, (C) the slope of the brand is the largest, (B) the slope of the brand is the smallest, from the frequency of 100Hz to 100KHz, (A) ( B) (C) The slopes of the three brands (admittance ÷ frequency) are measured in order, 0.0000000038, 0.0000000036, 0.0000000054, and the slopes are also close to 0, which is the state of the horizontal line. The difference is the admittance value. size. Among them, (A) (B) two brands have the same physical properties, the acid-base value is 6~7, the specific gravity is 1.00~1.02, but after the test, the curves of the two brands (A)(B) are still For the difference.

Furthermore, a test for foam emission was carried out. The test method used is based on the foaming ratio of the Japanese fire extinguishing equipment and the 25% reduction time determination method and the Taiwan foam nozzle approval standard. The formula is mainly to collect the emitted foam in the two cylinders, and observe that the expansion ratio is greater than 5 times and the 25% reduction time is greater than 60 seconds. 5 times expansion ratio and 25% reduction time is an internationally recognized method. The above is only an example. The test method of foam emission can be carried out in accordance with national standards. The standards for foaming ratio and 25% reduction time in various countries are shown in Table 1.

As an example, the process is as follows. Other instruments, materials, voltages, frequencies, points, sample volumes, waiting time, and related data graphics obtained by using the present invention are also tested. The scope of the invention. (A) The brand is diluted with water to carry out the actual radiation test of different concentrations of foam fire extinguishing system to observe the foaming expansion of various concentrations. A total of nine actual radiation tests are carried out, 100% once (100% foam stock solution), 90% twice. (90% foam stock + 10% water) and 85% secondary (85% foam stock + 15% water), 80% three times (80% foam stock + 20% water), 60% once (60% foam stock + 40 % water), direct comparison analysis with the AC impedance values of the same concentration of foam stock solution. The equipment used in this embodiment comprises a foam nozzle, two 1000ml glass cylinders, one foam sample collector, two scales, two code tables and two calculators. The foam nozzle has a height of 2.2m and pump pressure. Using 6.0 kgf/cm ² , the foam temperature was 26.4 ° C and the ambient temperature was 25 ° C. The foam liquids of different concentrations are fully mixed in the solution storage tank. The tank body is made of steel, which is 190cm long, 169.5cm wide and 114cm high. The unused solution is discarded and re-rinsed to ensure the wall is cleaned. The quality of subsequent trials. The main procedures are: (1) flushing the tank wall → (2) first placing a certain proportion of water and then placing a certain proportion of the foam stock solution → (3) fully mixing → (4) starting the pressurizing motor → (5) emitting the foam solution → (6) ) Collect the foam in 1000ml two measuring cylinders → (7) Stop the collection after the measuring cylinder is full of foam, then press the code table → (8) Measure the expansion ratio = 1000ml / the weight of the sample after subtracting the weight of the container (ml) → (9) Measure 25% reduction time = the time required for the foam defoamed to be the amount of foamed water and reduced to 25% of the total amount of foamed water. When the foam is reduced to 25% of water, the code is taken and recorded. Among them, the expansion ratio refers to the ratio of the foamed water before the final amount of foaming before the air is mixed.

As an example, the process is as follows. Other instruments, materials, voltages, frequencies, points, sample volumes, waiting time, and related data graphics obtained by using the present invention are also tested. Scope of the invention. The actual radiation test results of the foam are shown in Table 2. The 100% concentration of the (A) brand has an average expansion ratio of 6.75 times and a 25% reduction time of 75.12 seconds. The 90% concentration of the (A) brand foam stock solution is actually irradiated with foam. The foaming ratio averages 5.125 times and the 25% reduction time is 73.50 seconds. The 8% concentration of the (A) brand foam stock solution is actually radiated by the foam, the foaming ratio is 4.5 and 25%, and the reduction time is 72.95 seconds, 80% concentration. (A) brand foam stock solution through the actual radiation foam, the expansion ratio is 5 times on average and 25% reduction time is 70.13 seconds, 60% concentration of (A) brand foam stock solution through actual radiation foam, the average expansion ratio is 3.75 And 25% reduction time is 70.55 seconds. According to the above test results, for the (A) brand, the foam characteristics of the foam stock solution of 90% or more are better, so (A) the brand needs to maintain the concentration of more than 90% to effectively achieve the fire extinguishing effect. However, the preferred foam concentration characteristics of the brands are not the same. Preferably, the 90% concentration is only for the (A) brand, and other brands need to be tested separately, and the tests of each brand can be completed by the foam detecting method of the present invention.

According to the above, the detection method provided by the invention can clearly determine the quality of the foam stock solution, and can be divided into two types of detection methods, the first one is the brand identification of the stock liquid, and the second type is the quality control of the stock liquid, which is as follows: Brand identification of raw liquid: The frequency of the foam raw liquid admittance provided by the seller or related information can be recorded in the computer database. In the future, when the brand of the foam liquid is to be determined, the previous computer data can be used to judge the comparison. in accordance with.

The first (A) brand example description process is as follows. Others who use different foam brands and obtain relevant data graphic data, etc., using the present invention, are also within the scope of the present invention. Quality control of raw liquid: When the foam stock brand is known, but I don't know whether its quality can meet the requirements, this method can be used to measure the admittance value. When (A) brand admittance value is lower than 90% curve graph ( For the (A) brand), the foam stock solution that is not considered to be qualified or to be used continuously needs to be subjected to the actual radiation test of the foam; otherwise, when the (A) brand admittance value is higher than 90% of the curve pattern, it is regarded as Safe foam stock, no need to carry out actual foam test.

In summary, the different concentrations of foam stocks of the same brand use AC impedance analyzer to measure the frequency and admittance pattern and other relevant data and data, but the stability is good, and there is a certain proportional relationship among various concentrations. Therefore, it is indeed feasible to determine the concentration of the foam stock solution by measuring the pattern obtained from the foam solution of unknown concentration by an AC impedance analyzer. Different brands of foam stocks use AC impedance analyzer to measure the frequency and admittance pattern. Therefore, each brand should establish its own acceptable curve. (A) The 90% concentration of the foam stock solution is in compliance with the specified acceptable value. The frequency and admittance pattern of the measured 90% concentration of the foam stock solution is also recognized as an acceptable curve. When the foam is below the line, the foam is below the line. The stock solution, which is not considered to be qualified or has to be used continuously. A graph obtained by measuring an unknown concentration of foam stock solution by an AC impedance analyzer can be used as a basis for detecting the quality of commercially available and imported foam stock solutions. The AC impedance analyzer measures the foam stock solution of the foam tank in the foam fire extinguishing system in the building, and can measure whether the foam can continue to be used instead of the current actual radiation foam detection method, saving a lot of time, money and manpower.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

S11~S17‧‧‧Steps

Claims (9)

A foam stock solution detecting method comprising the following steps: A. placing a foam stock solution in a solution tank in an electrochemical impedance impedance analyzer measuring portion, and setting a metal diode plate in the solution tank; B, an electrochemical An AC impedance analyzer is connected to the metal diode to output voltage and current to the foam stock solution for ion ion migration, and the frequency and admittance and frequency of the bubble stock solution are measured by the electrochemical impedance analyzer. Four kinds of relative data of impedance, frequency and conductance, frequency and susceptance; C. In the actual radiating part of the foam of the foam fire extinguishing system, start the pressure motor to spray the foam liquid through the foam nozzle; D, collect the volume by using the measuring cylinder Spraying the foam in a predetermined amount to observe the foaming ratio and foam reduction; and E, comparing the frequency and admittance, frequency and impedance, frequency and conductance, frequency and susceptance of the four relative data and foaming In the case of magnification and foam reduction, the relative relationship between the expansion ratio and the foam reduction situation was determined and recorded. The method for detecting a foam stock solution according to claim 1, wherein in the step A, the method further comprises the steps of: placing water in the solution tank and stirring and mixing with the foam stock solution. The method for detecting a foam stock solution according to claim 1, wherein the step C further comprises the steps of: placing water in the solution tank, and placing the foam stock solution for stirring and mixing. The foam stock solution detecting method according to claim 1, wherein the predetermined amount is 1 to 1000 ml. The foam stock solution detecting method according to claim 1, wherein the pressurizing motor has a pressurizing pressure of 1 to 100 kgf/cm ² . The method for detecting a foam stock solution according to claim 1, wherein the excitation voltage of the electrochemical AC impedance analyzer is set to 0.002 to 30 V, and the set frequency is 0.1 Hz to 10000 KHz. The method for detecting a foam stock solution according to claim 1, wherein the method comprises the following sequence of steps: C, D, A, B, and E. The method for detecting a foam stock solution according to claim 1, wherein the steps A and C further comprise the following steps: the solution tank needs to be cleaned before each test. The method for detecting a foam stock solution according to claim 1, wherein in the step A, the method further comprises the step of: maintaining the liquid level in the solution tank at each test.