CN115944878A - Service life estimation device for vehicle-mounted water film-forming fire extinguishing agent - Google Patents
Service life estimation device for vehicle-mounted water film-forming fire extinguishing agent Download PDFInfo
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- CN115944878A CN115944878A CN202211661154.6A CN202211661154A CN115944878A CN 115944878 A CN115944878 A CN 115944878A CN 202211661154 A CN202211661154 A CN 202211661154A CN 115944878 A CN115944878 A CN 115944878A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000007667 floating Methods 0.000 claims abstract description 4
- 230000008014 freezing Effects 0.000 claims description 12
- 238000007710 freezing Methods 0.000 claims description 12
- 230000036760 body temperature Effects 0.000 claims description 8
- 239000006261 foam material Substances 0.000 claims description 3
- 101100236764 Caenorhabditis elegans mcu-1 gene Proteins 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
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Abstract
The invention discloses a service life estimation device for a vehicle-mounted water film-forming fire extinguishing agent, which comprises the following components: (1) 1 Microcontroller (MCU) responsible for measuring and storing data; (2) 1 temperature sensor clinging to the water film-forming fire extinguishing agent tank body; (3) 1 temperature sensor floating in the air beside the water film-forming fire-extinguishing agent tank body. The apparatus can evaluate the remaining shelf life of the aqueous film-forming fire suppressant through various logics and provide an alarm when the life is exhausted; the impending over-high and low temperature events can also be pre-warned by additional nearby air temperature sensors.
Description
Technical Field
The invention relates to the field of fire extinguishing agents and automatic intelligent instruments, in particular to an aqueous film-forming foam fire extinguishing agent and an automatic sensing system, and particularly relates to a service life estimation device for a vehicle-mounted aqueous film-forming fire extinguishing agent.
Background
Common vehicle-mounted fire extinguishing agents can be divided into dry powder and water-phase fire extinguishing agents, wherein the water-phase fire extinguishing agents comprise water film-forming fire extinguishing agents. The storage life of the water film-forming fire extinguishing agent obeys the Alonenius formula, namely the storage life exponentially decreases along with the storage temperature, and for a typical water film-forming fire extinguishing agent, the storage temperature is 30 DEG o At the time of C, the carbon black is removed,deducing that the service life reaches 8.9 years; storage temperature is 60 deg.C o C, the life is only 1.1 year (Yuan, xie, han Yong He, etc.. A method for measuring the storage life of the novel water-film-forming fire extinguishing agent [ J]Fire science and technology, 2008, 27 (5): 3.). Under the vehicle-mounted scene, the storage temperature of the water film-forming fire extinguishing agent has a large variation range, and the temperature in the vehicle can reach or exceed 60 ℃ particularly in summer o C, the storage life of the water film-forming fire extinguishing agent is seriously influenced. In addition, aqueous film forming agents have a minimum storage temperature limit below which the components will partially condense and even re-melt, which can seriously affect their fire extinguishing efficacy, thus necessitating the recording of the low temperature events experienced by aqueous film forming agents.
Disclosure of Invention
The invention aims to provide a service life estimation device for a vehicle-mounted water film-forming fire extinguishing agent, aiming at the problem that the service life of the vehicle-mounted water film-forming fire extinguishing agent is easily influenced by the temperature of a vehicle.
The purpose of the invention is realized by the following scheme: an on-vehicle water filming fire extinguishing agent life estimation device comprises the following components:
a microcontroller MCU responsible for measuring and storing data;
a tank body temperature sensor clinging to the water film-forming fire extinguishing agent tank body;
and the microcontroller MCU controls the tank body temperature sensor and the gas temperature sensor, collects primary temperature data at intervals at regular time and sends the primary temperature data to the vehicle-mounted computer.
Preferably, the interval timing is such that temperature data is collected every 10min interval.
Further, the microcontroller MCU evaluates the temperature of the fire extinguishing agent in the tank through the returned temperature data of the tank temperature sensor, estimates the loss of the storage life of the water film-forming fire extinguishing agent in a period of time through an Arrhenius formula, and provides an alarm when the life is exhausted.
Preferably, the surface of the tank temperature sensor is covered by a foam insulation block.
Preferably, the gas temperature sensor is arranged at a position 1 cm beside the fire extinguishing agent tank body; and the microcontroller MCU estimates the temperature variation trend of the tank body temperature sensor through the gas temperature sensor.
The microcontroller MCU returns temperature data through the gas temperature sensor to evaluate whether the temperature is in a preset temperature range, and early warning is provided when the temperature exceeds the upper limit and the lower limit of the temperature.
When the microcontroller MCU reads the excessively low temperature data from the returned temperature data of the temperature sensor closely attached to the water film-forming fire extinguishing agent tank body, an additional introducing mechanism is used for judging the effectiveness of the water film-forming fire extinguishing agent, and the temperature can be set by a fire extinguishing agent manufacturer when leaving a factory.
Preferably, an STM32L431RCT6 single chip microcomputer provided with a LiteOS 5.0 real-time operating system (RTOS) is used as the microcontroller in the MCU.
Preferably, the same temperature sensor is adopted as the tank body temperature sensor and the gas temperature sensor, and both the same temperature sensor and the same temperature sensor are DS18B20 type temperature sensors.
It has been experimentally determined that during storage of a water-film forming fire suppressant, the liquid closer to the tank shell experiences a higher average temperature and loses life faster, and thus in the present invention, the tank temperature is used to estimate the fire suppressant liquid life without penetrating the fire suppressant tank. MCU adopts the Arrhenius formula to calculate the life-span of fire extinguishing agent loss in a period of time (being recorded as dt), if the average temperature in the period of time is recorded as T, then the life-span percentage dL of the water film-forming fire extinguishing agent loss in the period of time is calculated according to the following formula:
dL = dt/(A * exp(-BT) * 100 % (1)
wherein A and B are constants determined by experimentation;
the MCU can evaluate the residual life Lr of the current fire extinguishing agent by continuously accumulating dL values:
Lr = 100 % - ΣdL (2)。
according to the experimental result, the temperature of the fire extinguishing agent in the tank body and the temperature of the fire extinguishing agent in the tank body change along with the temperature of the air near the tank body, the temperature sensor floating in the air beside the water film-forming fire extinguishing agent tank body is used for continuously measuring the air temperature near the fire extinguishing agent tank body in the vehicle so as to predict the change trend of the temperature of the tank body, a user can set low-temperature and high-temperature early warning by himself, and the MCU can prompt by the vehicle-mounted computer with a display screen or connected with the display screen.
For low-temperature events, the device can properly deduct the service life according to the low-temperature experimental result of the fire extinguishing agent, or according to the requirement of GB15308-2006, when the low temperature is not lower than 10 ℃ below the freezing point and the accumulated time of the temperature lower than the freezing point is not more than 96 hours, the fire extinguishing agent can be completely recovered, and the service life is not deducted after the fire extinguishing agent is re-melted; when the accumulated time of the temperature lower than the freezing point exceeds 96 h or the low temperature is lower than 10 ℃ below the freezing point, the fire extinguishing agent is considered to be incapable of being recovered, and the service life is zero.
The invention does not need to penetrate through the water film-forming fire extinguishing agent tank body, and can early warn the upcoming high-temperature/low-temperature event through the additionally arranged air temperature sensor. The device can evaluate the remaining storage life of the water film-forming fire extinguishing agent through various logics and provide an alarm when the life is exhausted; the impending over-high and low temperature events can also be pre-warned by additional nearby air temperature sensors.
Drawings
FIG. 1 is a schematic view of an on-board water-borne film-forming fire suppressant life estimation device;
the numbering in the figures illustrates:
1——MCU;
2-temperature sensor clinging to water film-forming fire extinguishing agent tank body; 21-insulating layer;
3-temperature sensor floating in the air beside the water film-forming fire-extinguishing agent tank body;
4-fire extinguishing agent can body;
5-vehicle computer.
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.
A life estimation device for a water film fire extinguishing agent mounted on a vehicle, as shown in FIG. 1, wherein the water film fire extinguishing agent is loaded in a fire extinguishing agent tank 4, comprising:
a microcontroller MCU1 responsible for measuring and storing data;
a temperature sensor 2 clinging to the water film-forming fire extinguishing agent tank body, and an insulating layer 21 made of foam material is coated outside the temperature sensor 2;
the temperature sensor 3 floats in the air beside the water film-forming fire extinguishing agent tank body, the temperature sensor 2 clinging to the water film-forming fire extinguishing agent tank body and the temperature sensor 3 floats in the air beside the water film-forming fire extinguishing agent tank body are controlled by the microcontroller MCU1, primary temperature data are collected at intervals at regular time, and the primary temperature data are sent to the vehicle-mounted computer 5.
1. Setting up a device:
a microcontroller, a tank body temperature sensor and an air temperature sensor are arranged on a fire extinguishing agent simulation tank body with 8L of solvent according to the attached figure 1, and are connected with a simulation vehicle-mounted computer through TTL level communication.
2. Implementing the device logic:
and a LiteOS 5.0 real-time operating system (RTOS) is installed in the MCU, and task logic is compiled to realize temperature monitoring, life estimation and various functions, so that the device runs stably, and the maximum running time without manual intervention reaches more than 3 months.
The interval timing was such that temperature data was collected every 10 min.
3. The vehicle-mounted water film-forming fire extinguishing agent life estimation device according to claim 1 or 2, wherein the microcontroller MCU (1) estimates the temperature of the water film-forming fire extinguishing agent in the tank body through the temperature data returned by the tank body temperature sensor (2), estimates the loss of the storage life of the water film-forming fire extinguishing agent in a period of time through an Arrhenius formula, and provides an alarm when the life is exhausted.
4. The vehicle-mounted water-filming fire extinguishing agent life estimation device according to claim 3, wherein the MCU calculates the life lost by the fire extinguishing agent over a period of time (denoted by dt) using an Arrhenius equation, and if the average temperature over the period of time is denoted by T, the percentage dL of the life lost by the water-filming fire extinguishing agent over the period of time is calculated according to the following equation:
dL = dt/(A * exp(-BT) * 100 % (1)
wherein A and B are constants determined by experimentation;
the MCU can evaluate the residual life Lr of the current fire extinguishing agent by continuously accumulating dL values:
Lr = 100 % - ΣdL (2)。
5. the life estimation apparatus of a vehicle-mounted water film-forming fire extinguishing agent according to claim 1 or 2, characterized in that the surface of the tank temperature sensor (2) is covered by a heat insulating block (21) of foam material.
6. The life estimation device of a vehicle-mounted water film-forming fire extinguishing agent according to claim 1 or 2, wherein an air temperature sensor (3) is provided 1 cm beside the fire extinguishing agent tank body; the microcontroller MCU (1) estimates the temperature change trend of the temperature sensor (2) clinging to the water film-forming fire extinguishing agent tank body through the gas temperature sensor (3).
7. The device for estimating the service life of the vehicle-mounted water film-forming fire extinguishing agent according to claim 6, wherein the microcontroller MCU (1) estimates whether the temperature is within a preset temperature range through temperature data returned by the gas temperature sensor (3), and provides an early warning when the upper and lower temperature limits are exceeded.
8. The service life estimation device for the vehicle-mounted water film-forming fire extinguishing agent according to claim 1 or 2, characterized in that when the temperature data returned by the temperature sensor (2) of the tank body of the microcontroller MCU (1) reads the too low temperature data, an additional introducing mechanism is used for judging the effectiveness of the water film-forming fire extinguishing agent, and the temperature can be set by a fire extinguishing agent manufacturer when leaving a factory; namely: when the low temperature is not lower than 10 ℃ below the freezing point of the water film-forming fire extinguishing agent and the accumulated time of the temperature lower than the freezing point is not more than 96 hours, the fire extinguishing agent can be completely recovered and does not prolong the service life after being re-melted; when the accumulated time of the temperature below the freezing point exceeds 96 h or the low temperature is below the freezing point by 10 ℃, the fire extinguishing agent is considered to be incapable of being recovered, and the service life is zero.
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. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (8)
1. A life estimation device for an on-vehicle water-film-forming fire extinguishing agent, characterized by comprising:
a microcontroller MCU (1) responsible for measuring and storing data;
a tank body temperature sensor (2) clinging to the water film-forming fire extinguishing agent tank body;
a gas temperature sensor (3) floating in the air beside the water film-forming fire extinguishing agent tank body;
the micro-controller MCU (1) controls the tank temperature sensor (2) and the gas temperature sensor (3), collects primary temperature data at intervals at regular time and sends the primary temperature data to the vehicle-mounted computer.
2. The life estimation apparatus for an on-vehicle water-filming fire extinguishing agent according to claim 1, wherein the interval timing is such that temperature data is collected every 10 min.
3. The vehicle-mounted water film-forming fire extinguishing agent life estimation device according to claim 1 or 2, wherein the microcontroller MCU (1) estimates the temperature of the water film-forming fire extinguishing agent in the tank body through the temperature data returned by the tank body temperature sensor (2), estimates the loss of the storage life of the water film-forming fire extinguishing agent in a period of time through an Arrhenius formula, and provides an alarm when the life is exhausted.
4. The vehicle-mounted water-film-forming fire extinguishing agent life estimation device according to claim 3, wherein the MCU calculates the life lost by the fire extinguishing agent over a period of time (dt) by using an Arrhenius equation, and if the average temperature over the period of time is T, the percentage dL of the life lost by the water-film-forming fire extinguishing agent over the period of time is calculated according to the following equation:
dL = dt/(A * exp(-BT) * 100 % (1)
wherein A and B are constants determined by experimentation;
the MCU can evaluate the residual life Lr of the current fire extinguishing agent by continuously accumulating dL values:
Lr = 100 % - ΣdL (2)。
5. the service life estimation device of the vehicle-mounted water filming fire extinguishing agent according to claim 1 or 2, characterized in that the surface of the tank temperature sensor (2) is covered by a heat insulating block (21) of foam material.
6. The life estimation device of a vehicle-mounted water film-forming fire extinguishing agent according to claim 1 or 2, characterized in that an air temperature sensor (3) is arranged 1 cm beside the fire extinguishing agent tank body; the microcontroller MCU (1) estimates the temperature change trend of the temperature sensor (2) clinging to the water film forming fire extinguishing agent tank body through the gas temperature sensor (3).
7. The device for estimating the service life of the vehicle-mounted water film-forming fire extinguishing agent according to claim 6, wherein the microcontroller MCU (1) estimates whether the temperature is within a preset temperature range through temperature data returned by the gas temperature sensor (3), and provides an early warning when the upper and lower temperature limits are exceeded.
8. The vehicle-mounted water film-forming fire extinguishing agent life estimation device according to claim 1 or 2, characterized in that when the temperature data returned by the tank temperature sensor (2) of the microcontroller MCU (1) reads too low temperature data, an additional introduction mechanism judges the effectiveness of the water film-forming fire extinguishing agent, and the temperature can be set by a fire extinguishing agent manufacturer when leaving a factory; namely: when the low temperature is not lower than 10 ℃ below the freezing point of the water film-forming fire extinguishing agent and the accumulated time of the temperature lower than the freezing point is not more than 96 hours, the fire extinguishing agent can be completely recovered and does not prolong the service life after being re-melted; when the accumulated time of the temperature lower than the freezing point exceeds 96 h or the low temperature is lower than 10 ℃ below the freezing point, the fire extinguishing agent is considered to be incapable of being recovered, and the service life is zero.
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| CN202211661154.6A CN115944878A (en) | 2022-12-23 | 2022-12-23 | Service life estimation device for vehicle-mounted water film-forming fire extinguishing agent |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1252959A (en) * | 1984-03-15 | 1989-04-25 | Hilda Cordes | Liquid foam extinguishing agent |
| DE10110831A1 (en) * | 2001-03-06 | 2002-09-12 | Stockhausen Chem Fab Gmbh | Fire-prevention and -fighting with paper, plastics and metal waste stored in incinerator bunker uses jetted quencher which is water-in-oil or water-in-water polymer dispersion |
| JP2007319281A (en) * | 2006-05-31 | 2007-12-13 | Chugoku Electric Power Co Inc:The | Fire-extinguishing equipment, method of generating fire-extinguishing agent and fire-extinguishing agent |
| KR20110026253A (en) * | 2009-09-07 | 2011-03-15 | 주식회사 창성에이스산업 | Real-time weight sensing apparatus of fire extinguishing chemical and method thereof |
| EP2896432A1 (en) * | 2014-01-17 | 2015-07-22 | Minimax GmbH & Co KG | Method and assembly for extinguishing with a liquid synthetic fire extinguishing agent |
| KR20200040449A (en) * | 2018-10-10 | 2020-04-20 | (주)솔보텍 | Simulation apparatus and method for predicting facility aging of energy generation and storage device |
| 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 |
| CN113701850A (en) * | 2021-08-11 | 2021-11-26 | 上海纳米技术及应用国家工程研究中心有限公司 | Tank storage fire extinguishing agent leakage detection method and tank storage fire extinguishing agent leakage detection device |
| CN114021379A (en) * | 2021-11-19 | 2022-02-08 | 上海纳米技术及应用国家工程研究中心有限公司 | Method for estimating storage life of water storage film-forming fire extinguishing agent of tank and providing extreme temperature early warning by multiple temperature sources |
| CN114323350A (en) * | 2021-12-31 | 2022-04-12 | 上海纳米技术及应用国家工程研究中心有限公司 | Automatic calibration method for temperature sensor in water film-forming fire extinguishing agent |
-
2022
- 2022-12-23 CN CN202211661154.6A patent/CN115944878A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1252959A (en) * | 1984-03-15 | 1989-04-25 | Hilda Cordes | Liquid foam extinguishing agent |
| DE10110831A1 (en) * | 2001-03-06 | 2002-09-12 | Stockhausen Chem Fab Gmbh | Fire-prevention and -fighting with paper, plastics and metal waste stored in incinerator bunker uses jetted quencher which is water-in-oil or water-in-water polymer dispersion |
| JP2007319281A (en) * | 2006-05-31 | 2007-12-13 | Chugoku Electric Power Co Inc:The | Fire-extinguishing equipment, method of generating fire-extinguishing agent and fire-extinguishing agent |
| KR20110026253A (en) * | 2009-09-07 | 2011-03-15 | 주식회사 창성에이스산업 | Real-time weight sensing apparatus of fire extinguishing chemical and method thereof |
| EP2896432A1 (en) * | 2014-01-17 | 2015-07-22 | Minimax GmbH & Co KG | Method and assembly for extinguishing with a liquid synthetic fire extinguishing agent |
| KR20200040449A (en) * | 2018-10-10 | 2020-04-20 | (주)솔보텍 | Simulation apparatus and method for predicting facility aging of energy generation and storage device |
| 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 |
| CN113701850A (en) * | 2021-08-11 | 2021-11-26 | 上海纳米技术及应用国家工程研究中心有限公司 | Tank storage fire extinguishing agent leakage detection method and tank storage fire extinguishing agent leakage detection device |
| CN114021379A (en) * | 2021-11-19 | 2022-02-08 | 上海纳米技术及应用国家工程研究中心有限公司 | Method for estimating storage life of water storage film-forming fire extinguishing agent of tank and providing extreme temperature early warning by multiple temperature sources |
| CN114323350A (en) * | 2021-12-31 | 2022-04-12 | 上海纳米技术及应用国家工程研究中心有限公司 | Automatic calibration method for temperature sensor in water film-forming fire extinguishing agent |
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