CN104422719A - Foam concentrate detection method - Google Patents
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- CN104422719A CN104422719A CN201310395246.9A CN201310395246A CN104422719A CN 104422719 A CN104422719 A CN 104422719A CN 201310395246 A CN201310395246 A CN 201310395246A CN 104422719 A CN104422719 A CN 104422719A
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Abstract
The invention relates to a foam concentrate detection method. The problems that a conventional foam concentrate detection method is long in time and resources are wasted are solved, and the invention provides a foam concentrate detection method. According to the technical scheme, the method comprises the following steps: measuring the admittance frequency and other various relative information of foam concentrate in a foam tank in a foam fire-fighting system by virtue of an electrochemical impedance spectroscopy analyzer, performing foam emission on the foam concentrate, observing and recording a foaming ratio and a foam reduction situation, comparing four kinds of relative data, such as frequency and admittance, frequency and impedance, frequency and electric conductance, and frequency and electrical susceptance, with the foaming ratio and the foam reduction situation, solving a relative relationship between the foaming ratio and the foam reduction situation, and recording the relative relationship. The method disclosed by the invention has the beneficial effects that a large amount of time, money and manual labor is saved for detection units, and the method is suitable for the foam concentrate detection.
Description
Technical field
The present invention relates to foam dope detection method, particularly utilize the foam dope detection method performed by electrochemical AC impedance analyser.
Background technology
Numerous vehicle (locomotive and automobile) has been stopped in parking lot, structure due to vehicle itself is inflammable thing mostly, as fuel oil, seat, rubber tyre, various drapery and with car goods, once breaking out of fire, burning rate is fast and prolong burning rapidly, and the cigarette that these burnings produce, heat often cause a large amount of human life injures and deaths and damage to property.In order to reduce the expansion of vehicle burning, parking lot must arrange froth fire extinguishing system according to regulation, improve namely early attack time to increase personnel escape's probalility of success.Foam is a kind of water being full of air bubble, its density is lower than a kind of aggregate of combustible liquids, can cover on the surface of burning objects when radiating out via froth fire extinguishing system, supply burning objects can be continued and then burning stopped by block oxygen, fall because foam is not easy loss, therefore also effective especially for oils (category-B) fire.
Foam dope is put in separately in solution storage groove at ordinary times, then by the pumping in froth fire extinguishing system and water pipe, finally spills to form foam from foam nozzle.After foam radiates so the quality of foam dope concerns, whether can have enough expansion ratios and whether can too early vanish and become water, and object on fire and protective article for cell surface cannot be covered in a large number, so the quality of foam dope must be paid attention to.
The detailed constituent ratio of foam dope is considered as the trade secret of fabricator, and user all has no way of learning, also can learn that the performance of foam dope is good and bad immediately without more simply and fast method, the written data that can only provide with dealer is at present audited.For Taiwan, commercially available foam dope can use after generally needing administration's paper audit to pass through, applicant must examine attached external test stone and certification of inspection, although dealer is known as with barreled imported with original packaging, but also some is that a large amount of import is given and point is filled in bucket, but no matter be any mode, as long as when the content that provides of dealer is different, be to learn that whether its quality is identical with provided written data then and there.
At present about the quality management and control of foam dope, be all foam dope will be sprayed out via sprinkler head, regather the foam sprayed and detect, just confirmed foaming situation through actual radiation foam program.But, actual radiation foam needs many manpowers, also a lot of time is needed in preparation, radiation and cleaning time of dealing with problems arising from an accident, wherein consuming time and the most inconvenient is that vehicle in radioactive area will all be removed, all will expend suitable time, money and manpower, how much liquid radiated also can cause environmental pollution.Therefore; the present invention wishes to develop more easy, correct, effective, economic foam dope inspection alternative method; government department's selective examination, fire fighting equipment professional and technical personnel prophylactic repair, place everyone and maintainer oneself maintenance overhaul are provided; or mechanism of school, professional testing agency on behalf of inspection new method, to save time and resource.
Summary of the invention
The object of the invention is: because the problem of above-mentioned prior art, a kind of foam dope detection method utilizing electrochemical AC impedance analyser to carry out is provided, to substituting existing bubble test method, and then reach effects such as saving money, time and manpower.
The present invention solves its technical matters, and the technical scheme of employing is, foam dope detection method, and it comprises the following step: place foam dope in a solution storage groove; Metal two pole plate is set in this solution storage groove; One electrochemical AC impedance analyser is connected this metal two pole plate, to vacillate to carry out electron ion in output voltage and electric current to this foam dope, and then other relative information various such as the admittance frequency measuring Gai Pao Droplets stoste through this electrochemical AC impedance analyser; In the foam actual radiation part of froth fire extinguishing system, start compression motor and spray out via a foam nozzle to make this foam dope; And utilize the foam of graduated cylinder collection through spraying in a scheduled volume, and press stopwatch to calculate expansion ratio and 25% recovery time of this foam; The various relative information such as comparison admittance frequency and expansion ratio and 25% recovery time, obtain expansion ratio and 25% recovery time all qualified admittance frequency or relevant information, curve or data can be accepted to produce one of admittance frequency or relevant information, and can accept in curve or data storing to database; And cleaning solution accumulator tank, and another foam dope placed with brand or unknown brand is in solution storage groove, and utilize electrochemical AC impedance analyser to measure the admittance frequency curve of this another foam dope and various relative information, and then foundation can accept curve or whether qualified data are to the expansion ratio and 25% recovery time that judge another foam dope.
Preferably, foam dope detection method of the present invention, it more comprises the following step: electrochemical AC impedance analyser measures part, places water in this solution storage groove, and is uniformly mixed with this foam dope.
Preferably, foam dope detection method of the present invention, it more comprises the following step: in the foam actual radiation part of froth fire extinguishing system, places water in this solution storage groove, and is uniformly mixed with this another foam dope.
Preferably, scheduled volume is 1000ml or other suitable amounts.
Preferably, the moulding pressure of compression motor is 6.0kgf/cm
2or other pressure.
Preferably, the driving voltage system of electrochemical AC impedance analyser be set as 0.02V or other can test voltage, and setpoint frequency 1HZ to 100KHZ or other can test frequency, be test point can carry out data recording with every 50 points or other.
Preferably, solution storage groove can be iron and steel material quality or other materials are made.
The foam dope detection method that object according to the present invention proposes, place foam dope in solution storage groove, and conduction two pole plate is set in this solution storage groove, and this conduction two pole plate is connected an electrochemical AC impedance analyser, to vacillate to carry out electron ion in output voltage and electric current to this foam dope, and then other relative information various such as the admittance frequency measuring Gai Pao Droplets stoste through this electrochemical AC impedance analyser, and carry out the foam radiation of this foam dope, to observe record expansion ratio and foam reduction situation, and the various relative information such as comparison admittance frequency and expansion ratio and foam reduce relative situation, in the hope of going out expansion ratio and the foam all qualified admittance frequency of reduction situation or relevant information to produce accepted curve or the data of an admittance frequency or relevant information.
The invention has the beneficial effects as follows; pass through such scheme; the foam dope of foam chute in froth fire extinguishing system is measured by electrochemical AC impedance analyser; this foam can be measured can continue to use; substitute the detection mode of existing actual radiation foam; to supply government department, fire fighting equipment professional and technical personnel, place everyone, maintainer, mechanism of school and professional testing agency use, and makes this detection unit can save plenty of time, money and manpower.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of foam dope detection method of the present invention;
Fig. 2 is the frequency of foam dope under variable concentrations that exemplify (A) brand and admittance graph of a relation;
Fig. 3 is frequency and the admittance graph of a relation of the foam dope exemplifying various brands.
Embodiment
For the effect fully understanding technical characteristic of the present invention, content and advantage and can reach, hereby by following specific embodiment, and coordinate accompanying drawing, the present invention is described in detail, be described as follows, and wherein used accompanying drawing, its purport is only signal and aid illustration book, may not be actual proportions after the invention process and precisely configure, therefore should not understand with regard to the ratio of institute's accompanying drawing and configuration relation, limit to the interest field of the present invention on reality is implemented.
Refer to Fig. 1, it is the process flow diagram of foam dope detection method of the present invention, and its process step comprises:
Step S11: part surveyed by electrochemical AC impedance analyser, places foam dope in a solution storage groove;
Step S12: metal two pole plate is set in this solution storage groove;
Step S13: an electrochemical AC impedance analyser is connected this metal two pole plate, to vacillate to carry out electron ion in output voltage and electric current to this foam dope, and then other relative information various such as the admittance frequency measuring Gai Pao Droplets stoste through this electrochemical AC impedance analyser;
Step S14: in the foam actual radiation part of froth fire extinguishing system, starts compression motor and sprays out via a foam nozzle to make this foam dope; And
Step S15: utilize the foam of graduated cylinder collection through spraying in a scheduled volume, and press stopwatch to calculate expansion ratio and 25% recovery time of this foam.
Step S16: the various relative information such as comparison admittance frequency and expansion ratio and 25% recovery time, obtain expansion ratio and 25% recovery time all qualified admittance frequency or relevant information, curve or data can be accepted to produce one of admittance frequency or relevant information, and can accept in curve or data storing to database.
Step S17: cleaning solution accumulator tank, and another foam dope placed with brand or unknown brand is in solution storage groove, and utilize electrochemical AC impedance analyser to measure the admittance frequency curve of this another foam dope and various relative information, and then foundation can accept curve or whether qualified data are to the expansion ratio and 25% recovery time that judge another foam dope.
In above-mentioned, in the step S11 of foam dope detection method of the present invention and step S17, water is placed in solution storage groove, and the foam dope of inserting same brand or unknown brand is uniformly mixed.
In above-mentioned, described scheduled volume can be 1000ml or other Sqs, and the moulding pressure of compression motor is 6.0kgf/cm2 or other pressure.
The present invention measures in foam dope for using electrochemical AC impedance analyser in the world first.There is Successful utilization in the electrochemical AC impedance analyser past in the concentration detecting milk, also being applied to the admittance value research of the interface behavior of analysis of metallic materials, the testing research of battery, the polysiloxane film (a polysiloxane film to organic vapours) of organic vapor, even doing interior saturated research for measuring concrete thin aggregate face.The application of instrument more and more adds extensively, all obtains good academy's successes, especially quite a few in the quantity of raw hospital face application, so the application of electrical impedance should be a kind of method for measurement trusty.But there is no people so far uses the method to be applied to the product control research of foam dope.
In above-mentioned, lift an example operation as follows, other use the present invention and use the utensil of different size, material, voltage, frequency, count, sample volume, wait for time, gained related data graph data etc. quietly, and person also belongs to the scope of the invention to be tested out related data.The test ambient temperature measured in stability is 25 DEG C, and solution storage groove is the rectangular solid figure groove of acryl system, and acryl thickness is 4.94mm, and cell body inside length is 12.4 ㎝, inboard width is 7.7 ㎝ and inside height is 8.0 ㎝.The pole plate of two galvanized iron sheet metal materials is provided with, thickness 1.18mm, length 10.0 ㎝ and width 7.8 ㎝ in two sides of solution storage groove.One end of each pole plate respectively uses two individually shielded concentric cable to be connected with ac resistance analysis instrument to carry out voltage and electric current to export and transmits with data input.The driving voltage system of electrochemical AC impedance analyser is set as 0.02V, and a data recording is done with every 50 points by setpoint frequency 1HZ to 100KHZ system.Ac resistance analysis instrument also connects notebook computer again through the joint of EIA-RS-232 and carries out controlling test and data recording.When inserting after foam solution sample volume is 50ml, leave standstill about 5 minutes until liquid level steadily after carry out again measuring " frequency-admittance " relational graph.
In above-mentioned, as follows for an example declarative procedure, other use the present invention and use the foam dope, gained related data, figure, data etc. of different brands, are tested out related data person and also belong to the scope of the invention.When carrying out AC impedance test, often kind of concentration is all get evenly new liquid to add water abundant mixing again, then tests separately respectively.First first stage carries out the ac resistance analysis of the various concentration of (A) brand, (A) relation curve of frequency (1Hz to 100KHz) and the admittance of the various concentration of brand as shown in Figure 2, when finding no matter to be any concentration levels, when the slope of frequency before about 100Hz (admittance ÷ frequency) is all widely different, slope when foam dope does not add water is maximum, and the slope when the concentration of foam dope is diluted maximum by water is minimum.100% Pao Droplets stoste is at the relative admittance value 0.02106S of 100KHz, 90% Pao Droplets stoste is at the relative admittance value 0.01929S of 100KHz, 80% Pao Droplets stoste is 0.01719S at the relative admittance value of 100KHz, 60% Pao Droplets stoste is 0.01273S at the relative admittance value of 100KHz, 40% Pao Droplets stoste is 0.008590S at the relative admittance value of 100KHz, 20% Pao Droplets stoste is 0.004301S at the relative admittance value of 100KHz, such as 100% Pao Droplets stoste is about 2.5 times (the 0.02106 ÷ 0.008590=2.45s) of 40% Pao Droplets stoste at the relative admittance value of 100KHz at the relative admittance value of 100KHz, 100% Pao Droplets stoste is about 5 times (the 0.02106 ÷ 0.004301=4.90s) of 20% Pao Droplets stoste at the relative admittance value of 100KHz at the relative admittance value of 100KHz, after frequency 100Hz to 100KHz, the slope (admittance ÷ frequency) of various concentration is by 100%, 90%, 80%, 60%, 40%, 20% sequentially measurement is 0.0000000038, 0.0000000029, 0.0000000024, 0.0000000011, 0.0000000005, 0.0000000001, slope is all close to 0, that is be present horizontal state, difference is the difference of admittance value.
In above-mentioned, as follows for an example declarative procedure, other use the present invention and use the foam dope, gained related data, figure, data etc. of different brands, are tested out related data person and also belong to the scope of the invention.When liquid inserts pair of electrodes, after energising, under the effect of electric field, charged ion just produces the movement of certain orientation, and in water, negative ion shifts to anode, and kation shifts to negative electrode, makes liquid play electric action.Therefore the electric admittance value of 100% foam dope is the highest, when increasing the ratio of water, owing to diluting foam dope ion, so the electric admittance value of 20% foam dope is minimum.Subordinate phase carries out the ac resistance analysis of three kinds of different brands, the frequency (1Hz to 100KHz) of various brand and the relation curve of admittance are as shown in Figure 3, (A) relation curve of (B) (C) three brand has notable difference, the slope of various brand before frequency is about 100Hz (admittance ÷ frequency) all differs greatly, (C) slope of brand is maximum, (B) slope of brand is minimum, after frequency 100Hz to 100KHz, (A) slope (admittance ÷ frequency) of (B) (C) three kinds of brands sequentially measures and is, 0.0000000038, 0.0000000036, 0.0000000054, slope is also all close to 0, that is be present horizontal state, different difference is the size of admittance value.Wherein, (A) (B) is though two kinds of brands select the same physical property, and pH-value is 6 ~ 7, and proportion is 1.00 ~ 1.02, and after test, the curve map of (A) (B) two kinds of brands is still different.
Moreover, carry out the test of foam radiation.The test method system that it adopts steeps fire protection device expansion ratio and 25% recovery time assay method and Taiwan foam nozzle accreditation benchmark with reference to Japan and formulated, mainly gather the foam that radiates in two graduated cylinders, observe its expansion ratio be greater than 5 times and 25% recovery time was greater than 60 seconds time, side be considered as conforming with the regulations.5 times of expansion ratios and 25% recovery time are a kind of methods of international endorsement.This only illustrates above, foam radiation test method various countries' specification can be coordinated to carry out, various countries about expansion ratio and the standard of 25% recovery time citing as shown in table 1.
Table 1
As follows for an example declarative procedure, other use the present invention and use the utensil of different size, material, voltage, frequency, count, sample volume, wait for time, gained related data graph data etc. quietly, and person also belongs to the scope of the invention to be tested out related data.(A) brand carries out the froth fire extinguishing system actual radiation test that thin up carries out variable concentrations, to observe the foaming and intumescing situation of various concentration, carry out nine actual radiation tests altogether, 100% once (100% foam dope), 90% 2 time (90% foam dope+10% water) and 85% 2 time (85% foam dope+15% water), 80% 3 time (80% foam dope+20% water), 60% once (60% foam dope+40% water), carry out direct compare of analysis with the AC impedance of same concentrations foam dope respectively.The equipment that the present embodiment uses comprise bubble jet first, 1000ml glass cylinder two, foam test portion collector one, amount scale two, two, stopwatch and counter two, foam nozzle radiation is highly 2.2m, engine pressure adopts 6.0kgf/cm2, and foam temperature is 26.4 DEG C and environment temperature 25 DEG C.The foam dope of various variable concentrations is fully mixed in solution storage groove all respectively, and cell body is iron and steel system, long 190 ㎝, wide 169.5 ㎝ and high 114 ㎝, the solution do not used all give discharge give up after and flushed channel wall again, to guarantee the quality of follow-up test.Main program for (1) rinse cell wall → (2) first put the certain proportion water yield insert again finite concentration ratio foam dope → (3) fully mixing → (4) start radiation foam solution → (6), compression motor → (5) gather foam in 1000ml bis-graduated cylinders → (7) graduated cylinder stops gathering after being full of foam, press immediately stopwatch → (8) measure expansion ratio=1000ml/ deduct container weight after net weight examination body volume (ml) → (9) of converting measure 25% recovery time=the foam froth breaking that gathers is the foam water yield, is reduced to 25% required time of whole foam water yield.Foam is reduced into when water reaches 25% and connects lower stopwatch and note down it.Wherein, expansion ratio refers to the ratio measuring the foam water before not being mixed into air and final gas release.
As follows for an example declarative procedure, other use the present invention and use the utensil of different size, material, voltage, frequency, count, sample volume, wait for time, gained related data graph data etc. quietly, and person also belongs to the scope of the invention to be tested out related data.Foam actual radiation test findings is as shown in table 2, expansion ratio average out to 6.75 times and 25% recovery time of (A) brand of 100% concentration are 75.12 seconds, (A) brand foam dope of 90% concentration is through actual radiation foam, expansion ratio average out to 5.125 times and 25% recovery time are 73.50 seconds, (A) brand foam dope of 85% concentration is through actual radiation foam, expansion ratio average out to 4.5 and 25% recovery time are 72.95 seconds, (A) brand foam dope of 80% concentration is through actual radiation foam, expansion ratio average out to 5 times and 25% recovery time are 70.13 seconds, , (A) brand foam dope of 60% concentration is through actual radiation foam, expansion ratio average out to 3.75 and 25% recovery time are 70.55 seconds.Learnt by above test findings, for (A) brand, the foam characteristic of foam dope more than 90% concentration is good, effect of fire extinguishing therefore the concentration that (A) brand need maintain more than 90% begins effectively to reach.So, the better consistency of foam characteristic of various brands is not identical, and better 90% concentration is only for (A) brand, and other brand needs test in addition, and the test of various brands all can come by foam detecting method of the present invention.
Table 2
According to above-mentioned, detection method provided by the present invention can know the quality judging foam dope, wherein can be divided into two class detection methods, and the first is the brand identification of stoste, and the second is the quality control of stoste, is described as follows:
The brand identification of stoste: the foam dope admittance frequency that dealer can be provided or relevant information, be embedded in Computer Database, in the future when determining the brand of foam dope again, can use previous computer data to think the foundation of contrast judgement.
As follows for one (A) brand example declarative procedure, other use the present invention and use different foam brands, gained related data graph data etc., and person also belongs to the scope of the invention to be tested out related data.The quality control of stoste: when foam dope brand is known, but do not know whether its quality can conform with the regulations, this method can be used to carry out admittance value measurement, when (A) brand admittance value is lower than (being for (A) brand) during less than 90% curvilinear figure, be not considered as the qualified foam dope that maybe must continue to use, need to carry out the test of foam actual radiation again; Otherwise, when (A) brand admittance value is higher than more than 90% curvilinear figure, be then considered as safe foam dope, the test of foam actual radiation need not be carried out again.
Comprehensively above-mentioned, the variable concentrations foam dope of same brand, using the measurement of ac resistance analysis instrument to obtain the figure of frequency and admittance and other gained related data graph datas etc. truly has different, and good stability, between various concentration, there is certain proportionate relationship, therefore the figure of foam dope gained of unknown concentration is measured with ac resistance analysis instrument, judge that mode that foam dope concentration presents is really as feasible.The foam dope of different brands, using the measurement of ac resistance analysis instrument to obtain frequency also has different from the figure of admittance, therefore each brand all should set up its respective accepted curve.(A) foam dope of brand 90% concentration is the acceptable value that it conforms with the regulations, measured its frequency of foam dope of 90% concentration and the figure of admittance are also approved for accepting curve, when lower than the foam dope below this line, be not considered as the qualified foam dope that maybe must continue to use.Measure the figure of the foam dope gained of unknown concentration with ac resistance analysis instrument, can be used as the quality foundation detecting commercially available and import foam dope.Can ac resistance analysis instrument measures the foam dope arranging the foam chute in froth fire extinguishing system in buildings, can measure this foam and continue to use, to substitute the detection mode of existing actual radiation foam, save plenty of time, money and manpower.
The foregoing is only illustrative, but not be restricted person.Any spirit and category not departing from the present invention, and to its equivalent modifications of carrying out or change, all should be contained in rear attached claim.
Claims (10)
1. foam dope detection method, it comprises the following step:
A, survey part at electrochemical AC impedance analyser, place foam dope in a solution tank, and metal two pole plate is set in this solution tank;
B, an electrochemical AC impedance analyser is connected this metal two pole plate, to vacillate to carry out electron ion in output voltage and electric current to this foam dope, and then measure frequency and these four kinds of relative datas of admittance, frequency and impedance, frequency and conductance, frequency and susceptance of Gai Pao Droplets stoste through this electrochemical AC impedance analyser;
C, foam actual radiation part in froth fire extinguishing system, start compression motor and spray out via foam nozzle to make this foam solution;
D, utilizing the foam of graduated cylinder collection through spraying in a scheduled volume, carrying out expansion ratio and foam reduction situation observes record;
E, versus frequency and these four kinds of relative data of admittance, frequency and impedance, frequency and conductance, frequency and susceptance and expansion ratio and foam reduce situation, obtain the relativeness of expansion ratio and foam reduction situation, and by its record.
2. foam dope detection method as claimed in claim 1, is characterized in that, in step A, more comprise the following step:
Place water in this solution tank, and be uniformly mixed with this foam dope.
3. foam dope detection method as claimed in claim 1, is characterized in that, in step C, more comprise the following step:
Place water in this solution tank, and insert foam dope and be uniformly mixed.
4. foam dope detection method as claimed in claim 1, it is characterized in that, described scheduled volume is 1 ~ 1000ml.
5. foam dope detection method as claimed in claim 1, it is characterized in that, the moulding pressure of described compression motor is 1 ~ 100kgf/cm
2.
6. foam dope detection method as claimed in claim 1, it is characterized in that, the driving voltage of described electrochemical AC impedance analyser is set as 0.002 ~ 30V, and setpoint frequency 0.1Hz to 10000KHz.
7. foam dope detection method as claimed in claim 1, it is characterized in that, the order of step A ~ E step is the following step order:
C, D, A, B, E or A, B, C, D, E.
8. foam dope detection method as claimed in claim 1, is characterized in that, in step A and step C, more comprises the following step:
This solution tank, before each test, needs cleaning.
9. foam dope detection method as claimed in claim 1, is characterized in that, in step A, more comprise the following step:
This solution tank, when testing at every turn, must keep liquid level smooth.
10. foam dope detection method, it is characterized in that, place foam dope in solution tank, and conduction two pole plate is set in this solution storage groove, and this conduction two pole plate is connected an electrochemical AC impedance analyser, to vacillate to carry out electron ion in output voltage and electric current to this foam dope, and then frequency and the admittance of Gai Pao Droplets stoste is measured through this electrochemical AC impedance analyser, frequency and impedance, frequency and conductance, frequency and these four kinds of relative datas of susceptance, and carry out the foam radiation of this foam dope, to observe record expansion ratio and foam reduction situation, and versus frequency and admittance, frequency and impedance, frequency and conductance, these four kinds of relative datas of frequency and susceptance and expansion ratio and foam reduce the relativeness of relative situation, and noted down.
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| CN104422719B (en) | 2017-07-07 |
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