CN114113274A - Water film-forming fire extinguishing agent on-line monitoring device that mildenes and rot - Google Patents
Water film-forming fire extinguishing agent on-line monitoring device that mildenes and rot Download PDFInfo
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- CN114113274A CN114113274A CN202111462399.1A CN202111462399A CN114113274A CN 114113274 A CN114113274 A CN 114113274A CN 202111462399 A CN202111462399 A CN 202111462399A CN 114113274 A CN114113274 A CN 114113274A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000012806 monitoring device Methods 0.000 title claims abstract description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 239000010936 titanium Substances 0.000 claims abstract description 33
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 239000011550 stock solution Substances 0.000 claims description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 claims description 12
- 101150102866 adc1 gene Proteins 0.000 claims description 12
- 101150042711 adc2 gene Proteins 0.000 claims description 11
- 239000004408 titanium dioxide Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 claims description 2
- 230000032798 delamination Effects 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
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- Molecular Biology (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses an online mildew monitoring device for a water film-forming fire extinguishing agent, wherein a titanium electrode penetrating through a liquid level is used as a manually manufactured easily-polluted area, and when the titanium electrode mildews, the corresponding electrochemical property changes, and electric signal fluctuation is generated to indicate the occurrence of the mildewing.
Description
Technical Field
The invention relates to the field of novel sensors, in particular to a device for monitoring mildew by artificially establishing a susceptible area and utilizing an electric signal, and particularly relates to an online monitoring device for the mildew of a water film-forming fire extinguishing agent.
Background
The water filming fire extinguishing agent is one kind of liquid fire extinguishing agent for extinguishing oil fire, and its original liquid may produce biological pollution to mildew and lose fire extinguishing effect. Biological contamination generally first occurs in surface liquids, and when the biological contamination penetrates into the interior of the solution, the possibility of saving the fire extinguishing agent is not available, so that the mildew phenomenon can be conveniently found by measuring the physicochemical properties of the interior of the liquid, but the early warning capability is unavailable.
Titanium is a metal with better biocompatibility, and the surface of a pure titanium product is covered with a uniform and compact titanium dioxide protective layer, so that the effect of isolating air and preventing further oxidation can be achieved, and the corrosion resistance can be improved. The titanium dioxide protective layer on the surface of the titanium product can be thickened properly by heating the titanium product in the air.
Disclosure of Invention
The invention aims to provide an on-line monitoring device for mildew of a water film-forming fire extinguishing agent, aiming at the problems of detection and early warning of mildew caused by mildew pollution of the water film-forming fire extinguishing agent.
Yet another object of the present invention is to: a method of manufacturing the above device is provided.
The purpose of the invention is realized by the following scheme: the utility model provides an online monitoring device that water film-forming fire extinguishing agent mildenes and rot, microcontroller unit MCU and probe electrode are connected, and the data that microcontroller unit MCU collected transmit for the server through wireless or limited interface, utilize the titanium system electrode of crossing the liquid level to survey water film-forming fire extinguishing agent stoste and mildenes and rot the phenomenon in early stage, connect microprocessing unit (MCU) by three pure titanium electrodes that stretch into water film-forming fire extinguishing agent stoste at least, includes following part:
(1) the pure titanium electrode is obtained by heating three pure titanium rods with the same size in an air atmosphere to 300 ℃ for 1 hour, so that a titanium dioxide layer is formed on the surface of the pure titanium electrode;
(2) dividing the 3 pure titanium electrodes obtained in the step (1) into a working electrode, an auxiliary electrode and a counter electrode, wherein the counter electrode is positioned in the liquid level of the fire extinguishing agent stock solution, and one end of the counter electrode is connected with an MCU (microprogrammed control unit) through a digital-analog voltage conversion (DAC) interface or a general programmable I/O (input/output) port GPIO (general purpose input/output); one end of the working electrode extends into the liquid level of the water film-forming fire extinguishing agent, the other end of the working electrode is exposed out of the liquid level and is connected to the MCU through an ADC1 interface of an analog-digital voltage conversion channel, and the MCU is connected with the working electrode through a constant value resistor R1Grounding; the auxiliary electrode is positioned in the liquid surface of the water film-forming fire extinguishing agent, is connected to the MCU through the two ADC2 interfaces of the analog-digital voltage conversion channel and passes through the two R constant-value resistors2Grounding;
square wave signals are output through a DAC interface or a GPIO port, feedback electric signals are obtained by collecting an analog-digital voltage conversion channel I ADC1 and an analog-digital voltage conversion channel II ADC2 in a pulse period at intervals of 1 millisecond, signal data obtained by the ADC1 and the ADC2 are added by the MCU to obtain the added value of a working electrode and an auxiliary electrode, and a constant value resistor R is adjusted1And a constant value resistance two R2Making the two summed values substantially equal; MCU monitors the ratio change of the sum of the working electrode and the auxiliary electrode, and gives out a mildew early warning when the sum is abnormally increased within a plurality of days.
The invention relates to an online monitoring device for mildew of a water film-forming fire extinguishing agent, which is realized by connecting three pure titanium electrodes extending into stock solution of the water film-forming fire extinguishing agent with a microprocessing unit (MCU). Wherein, two pure titanium electrodes extend into the liquid level below, and one pure titanium electrode is arranged across the liquid level. The MCU judges whether the pure titanium electrode placed across the liquid level is mildewed or not through the electric signal, so that early warning of the mildewing of the water film-forming fire extinguishing agent stock solution is realized.
The principle of the invention is as follows: the working electrode which penetrates through the liquid level and is provided with the thickened titanium dioxide layer on the surface is the object which is most easily polluted by the mildew in the storage tank, when the mildew occurs at other positions in the storage tank, the spores are easily spread to the surface of the working electrode, and experiments show that the sum value of signals generated by the polluted working electrode is obviously increased. Therefore, the invention realizes the early warning of the mildew of the fire extinguishing agent stock solution in the whole tank body by artificially manufacturing the susceptible area. After the surface is mildewed, the current carrying capacity of the electrode is improved to some extent, which is the basic principle followed by the invention.
In the electrode circuit, the auxiliary electrode, the working electrode and the counter electrode are manufactured by the same method, and only the mounting positions are different, so that the interference of irrelevant factors is reduced.
In addition, in the electrode circuit, the auxiliary electrode and the working electrode are connected in parallel in the circuit, and the electrode circuit can play a role in eliminating voltage fluctuation and other irrelevant electric signal interference.
Because the two current paths of the device have the characteristic of automatically eliminating the influence of voltage fluctuation,when the GPIO port is adopted to output square wave signals, only R needs to be reset1And R2The precision identical to that of the DAC port can be achieved.
On the basis of the above scheme, the device of the present invention further comprises: the liquid level height indicating sensor, the sensor for phenomena such as external polluted liquid and unstable solution layering, and the like, when the server finds that the readings of other sensors are normal and the working electrode summation value/auxiliary electrode summation value given by the sensor is abnormally increased, the mildew phenomenon can be judged to occur.
Preferably, the pure titanium electrode adopts a titanium rod with the purity of 99.9%, the diameter of the titanium rod is 2 mm, and the length of the titanium rod is 10 cm.
Preferably, the voltage of the square wave pulse signal sent by the MCU is 3.2 volts, and the duration is 200 milliseconds; the MCU sends a signal every 6 hours.
The invention also provides a manufacturing method of the water film-forming fire extinguishing agent mildew on-line monitoring device, which adopts a DAC interface or a general programmable I/O port GPIO to send out a square wave pulse signal to the water film-forming fire extinguishing agent stock solution mildew on-line monitoring system, and the system is manufactured according to the following steps:
(1) 3 pure titanium rods with the diameter of 2 millimeters and the length of 10 centimeters are placed in an electric furnace and heated to 300 ℃ for 1 hour in the air atmosphere to be respectively used as a working electrode, an auxiliary electrode and a counter electrode;
(2) the counter electrode is positioned in the liquid level of the fire extinguishing agent stock solution, and one end of the counter electrode is connected with the MCU through a digital-to-analog voltage conversion channel DAC interface or a general programmable I/O port GPIO; one end of the working electrode extends into the liquid level of the water film-forming fire extinguishing agent, the other end of the working electrode is exposed out of the liquid level and is connected to the MCU through an ADC1 interface of an analog-digital voltage conversion channel, and the MCU is connected with the working electrode through a constant value resistor R1Grounding; the auxiliary electrode is positioned in the liquid surface of the water film-forming fire extinguishing agent, is connected to the MCU through the two ADC2 interfaces of the analog-digital voltage conversion channel and passes through the two R constant-value resistors2Grounding;
(3) writing a program to send out a pulse square wave signal at a DAC interface end, wherein the voltage is 3.2 volts and the duration is 200 milliseconds; the MCU through ADC1 and ADC2 collects feedback from the working electrode and auxiliary electrode during pulses at 1 millisecond intervalsCollecting 400 signal values of 200 working electrodes and 200 auxiliary electrodes in total by electric signals, and respectively summing 200 signal data obtained by the working electrodes and the auxiliary electrodes to obtain the sum of the working electrodes and the auxiliary electrodes; adjusting the constant resistance R1And R2The resistance values are basically equal, and the MCU sends out 1 pulse signal every 6 hours at regular intervals;
(4) the MCU monitors the ratio of the sum of the working electrode and the auxiliary electrode for a long time, and gives out a mildew early warning when the sum is abnormally increased within a plurality of days.
The invention has the advantage that the low-cost titanium electrode with long service life is used for realizing the low-cost early warning device for the mildew of the water film-forming fire extinguishing agent.
Drawings
FIG. 1: the invention is a structural block diagram;
1-stainless steel tank body;
11-fire extinguishing agent stock solution level;
2-working electrode;
3-counter electrode;
and 4-auxiliary electrode.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1.
An online monitoring device for mildew of a water film-forming fire extinguishing agent is shown in figure 1, and is manufactured by adopting a DAC port to send out a square wave pulse signal according to the following steps:
(1) the electrode comprises three pure titanium electrodes with the diameter of 2 mm and the length of 10 cm, wherein the pure titanium electrodes are obtained by heating three pure titanium rods with the same size in an air atmosphere to 300 ℃ for 1 hour, so that titanium dioxide layers are formed on the surfaces of the pure titanium electrodes;
(2) dividing the 3 pure titanium electrodes obtained in the step (1) into a working electrode, an auxiliary electrode and a counter electrode according to the formula shown in figure 1The working electrode, the auxiliary electrode and the counter electrode are arranged in the fire extinguishing agent stock solution in parallel at equal intervals, wherein the counter electrode 3 is positioned in the fire extinguishing agent stock solution liquid level 11, and one end of the counter electrode is connected with the MCU through a digital-to-analog voltage conversion DAC interface; one end of the working electrode 2 extends into the liquid level 11 of the water film-forming fire extinguishing agent, the other end of the working electrode is exposed out of the liquid level and is connected to the MCU through an ADC1 interface of an analog-digital voltage conversion channel, and the MCU is connected with the MCU through a constant value resistor R1Grounding; the auxiliary electrode 4 is positioned in the liquid level 11 of the water film-forming fire extinguishing agent, has the same immersion depth as the counter electrode 3 in the fire extinguishing agent stock solution, is connected to the MCU through a second ADC2 interface of an analog-digital voltage conversion channel, and is connected to the MCU through a second constant resistance R2Grounding;
(3) a program is compiled to output pulse square wave signals through a DAC interface, the voltage is 3.2 volts, and the duration is 200 milliseconds; the MCU collects feedback electric signals obtained by the first analog-digital voltage conversion channel ADC1 and the second analog-digital voltage conversion channel ADC2 in a pulse period at 1 millisecond intervals, the two ADC channels collect 400 signal values in total, namely 200 working electrodes and 200 auxiliary electrodes, and 200 signal data obtained by the working electrodes are added to obtain the addition value of the working electrodes; summing 200 signal data obtained by the auxiliary electrode to obtain a sum value of the auxiliary electrode; adjusting the constant resistance R1And R2Substantially equalizing the two values; the MCU sends out 1 pulse signal every 6 hours through program timing;
(4) and the MCU calculates the ratio of the sum of the working electrode and the auxiliary electrode and sends the ratio to the server 5 end through the network, and when the sum is increased by more than 5% within 5 days, the server end sends out a mildew early warning.
Example 2.
The utility model provides an online monitoring device that water film-forming fire extinguishing agent mildenes and rot, replaces DAC mouth with general purpose input/output interface GPIO and sends square wave pulse signal, and other structures are the same with embodiment 1, when MCU's DAC interface is not enough, can replace it to send square wave pulse signal with GPIO interface. The method specifically comprises the following steps: GPIO port, high speed turning mode and push-pull mode; the GPIO port can directly output 3.3 volt power supply signal, and because two current paths of the device have the characteristic of automatically eliminating the influence of voltage fluctuation, only R needs to be reset1And R2The precision identical to that of the DAC port can be achieved. Other hardware and software settings are the same as in example 1.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (6)
1. The utility model provides an online monitoring device that water film-forming fire extinguishing agent mildenes and rot, microcontroller unit MCU and probe electrode are connected, and the data that microcontroller unit MCU collected transmit for the server through wireless or limited interface, and its characterized in that utilizes the titanium system electrode of striding the liquid level to survey the early mildenes and rot phenomenon of water film-forming fire extinguishing agent stoste, connects microprocessing unit (MCU) by three pure titanium electrodes that stretch into water film-forming fire extinguishing agent stoste at least, includes following part:
(1) the pure titanium electrode is obtained by heating three pure titanium rods with the same size in an air atmosphere to 300 ℃ for 1 hour, so that a titanium dioxide layer is formed on the surface of the pure titanium electrode;
(2) dividing the 3 pure titanium electrodes obtained in the step (1) into a working electrode, an auxiliary electrode and a counter electrode, wherein the counter electrode is positioned in the liquid level of the fire extinguishing agent stock solution, and one end of the counter electrode is connected with an MCU (microprogrammed control unit) through a digital-analog voltage conversion (DAC) interface or a general programmable I/O (input/output) port GPIO (general purpose input/output); one end of the working electrode extends into the liquid level of the water film-forming fire extinguishing agent, the other end of the working electrode is exposed out of the liquid level and is connected to the MCU through an ADC1 interface of an analog-digital voltage conversion channel, and the MCU is connected with the working electrode through a constant value resistor R1Grounding; the auxiliary electrode is positioned in the liquid surface of the water film-forming fire extinguishing agent, is connected to the MCU through the two ADC2 interfaces of the analog-digital voltage conversion channel and passes through the two R constant-value resistors2Grounding;
outputting square wave signals through DAC interface or GPIO port, MCU collects analog-to-digital voltage conversion channels during pulses at 1 millisecond intervals, ADC1 andthe second ADC2 in the analog-digital voltage conversion channel obtains feedback electric signals, the MCU respectively sums the signal data obtained by the two channels of ADC1 and ADC2 to obtain the sum of the working electrode and the auxiliary electrode, and the first constant resistance R is adjusted1And a constant value resistance two R2Substantially equalizing the two values; MCU monitors the ratio change of the sum of the working electrode and the auxiliary electrode, and gives out a mildew early warning when the sum is abnormally increased within a plurality of days.
2. An on-line monitoring device for mildew of water film forming fire extinguishing agent, according to claim 1, further comprising a liquid level indicating sensor, a sensor for indicating the level of contaminated liquid and for indicating the instability and delamination of the solution, wherein when the server finds that the other sensors are reading normally and the working electrode sum/auxiliary electrode sum given by the sensor is abnormally increased, the occurrence of the mildew is determined.
3. The apparatus as claimed in claim 1, wherein the pure titanium electrode is a titanium rod with a purity of 99.9%, and has a diameter of 2 mm and a length of 10 cm.
4. The device for monitoring the mildew of the water-film forming fire extinguishing agent according to claim 1, wherein the voltage of the square-wave pulse signal emitted by the MCU is 3.2 volts and the duration is 200 milliseconds; the MCU sends a signal every 6 hours.
5. The method for manufacturing the device for monitoring the mildew of a water-film-forming fire extinguishing agent according to any one of claims 1 to 4, wherein: the on-line monitoring system for the mildew of the water film-forming fire extinguishing agent stock solution by adopting a DAC port to send out a square wave pulse signal is manufactured according to the following steps:
(1) 3 pure titanium rods with the diameter of 2 mm and the length of 10 cm are placed in an electric furnace and heated to 300 ℃ for 1 hour in the air atmosphere to form a titanium dioxide layer on the surface of a pure titanium electrode; respectively as a working electrode, an auxiliary electrode and a counter electrode;
(2) subjecting the working electrode, the auxiliary electrode and the electrode obtained in step (1)The counter electrodes are arranged in the fire extinguishing agent stock solution in parallel at equal intervals and are respectively connected with the MCU, wherein the counter electrodes are positioned in the liquid level of the fire extinguishing agent stock solution, and one end of each counter electrode is connected with the MCU through a DAC (digital-to-analog voltage conversion) interface; one end of the working electrode extends into the liquid level of the water film-forming fire extinguishing agent, the other end of the working electrode is exposed out of the liquid level and is connected to the MCU through an ADC1 interface of an analog-digital voltage conversion channel, and the MCU is connected with the working electrode through a constant value resistor R1Grounding; the auxiliary electrode is positioned in the liquid surface of the water film-forming fire extinguishing agent, has the same immersion depth as the counter electrode in the fire extinguishing agent stock solution, is connected to the MCU through the two ADC2 interfaces of the analog-digital voltage conversion channel, and is connected to the MCU through the two R fixed-value resistors2Grounding;
(3) programming a program to output a pulse square wave signal at a DAC interface end, wherein the voltage is 3.2 volts and the duration is 200 milliseconds; the MCU collects feedback electric signals obtained by an analog-digital voltage conversion channel I ADC1 and an analog-digital voltage conversion channel II in a pulse period at 1 millisecond intervals, collects 400 signal values in total, namely 200 working electrodes and 200 auxiliary electrodes, and sums up 200 signal data obtained by the working electrodes to obtain the sum value of the working electrodes; summing 200 signal data obtained by the auxiliary electrode to obtain a sum value of the auxiliary electrode; adjusting the constant resistance R1And R2The resistance values are basically equal, and the MCU sends out 1 pulse signal every 6 hours at regular intervals;
(4) and the MCU calculates the ratio of the sum of the working electrode and the auxiliary electrode and sends the sum to the server, and when the sum is increased by more than 5% within 5 days, the server sends out a mildew early warning.
6. The method for manufacturing an online monitoring device for mildew of a water-film-forming fire extinguishing agent according to claim 5, wherein: replace DAC mouth with general purpose input/output interface GPIO and send square wave pulse signal, specifically set up to: GPIO port, high speed turning mode and push-pull mode; the GPIO port will directly output a 3.3 volt power signal.
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|---|---|---|---|---|
| GB2293241A (en) * | 1994-09-14 | 1996-03-20 | Metal Box Plc | Detection of microbiological contamination of liquid or semi-liquid substances |
| CN101882350A (en) * | 2010-05-24 | 2010-11-10 | 清华大学 | Water pollution organism early warning system and method based on principle of microbial fuel cells |
| EP2918993A1 (en) * | 2014-03-01 | 2015-09-16 | Thomas Warscheid | Method and device for displaying the growth of mould in a monitored environment |
| KR101799353B1 (en) * | 2017-06-19 | 2017-11-20 | (주)윈스테크 | Pollution of reagent Measuring Methods for Water Quality Measuring system |
| CN112014298A (en) * | 2020-10-22 | 2020-12-01 | 广州大学 | Mold monitoring device, method and system based on weak electric signals |
| CN113607791A (en) * | 2021-08-11 | 2021-11-05 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of tank-stored foam extinguishing agent mildew early warning device and product thereof |
-
2021
- 2021-12-02 CN CN202111462399.1A patent/CN114113274B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2293241A (en) * | 1994-09-14 | 1996-03-20 | Metal Box Plc | Detection of microbiological contamination of liquid or semi-liquid substances |
| CN101882350A (en) * | 2010-05-24 | 2010-11-10 | 清华大学 | Water pollution organism early warning system and method based on principle of microbial fuel cells |
| EP2918993A1 (en) * | 2014-03-01 | 2015-09-16 | Thomas Warscheid | Method and device for displaying the growth of mould in a monitored environment |
| KR101799353B1 (en) * | 2017-06-19 | 2017-11-20 | (주)윈스테크 | Pollution of reagent Measuring Methods for Water Quality Measuring system |
| CN112014298A (en) * | 2020-10-22 | 2020-12-01 | 广州大学 | Mold monitoring device, method and system based on weak electric signals |
| CN113607791A (en) * | 2021-08-11 | 2021-11-05 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of tank-stored foam extinguishing agent mildew early warning device and product thereof |
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