CN1822065A - Leakage real time probe for liquefied petroleum gas tank/tank car while transport - Google Patents
Leakage real time probe for liquefied petroleum gas tank/tank car while transport Download PDFInfo
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- CN1822065A CN1822065A CN 200510200754 CN200510200754A CN1822065A CN 1822065 A CN1822065 A CN 1822065A CN 200510200754 CN200510200754 CN 200510200754 CN 200510200754 A CN200510200754 A CN 200510200754A CN 1822065 A CN1822065 A CN 1822065A
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Abstract
This invention relates to real time detector for leakage of LPG transportation tank cars including a master detector and two sub-detectors, in which, the master detector contains an environment sensitive probe, a control and information merging center inserted with a temperature and humidity compensation and concentration conversion algorithm and connected with a gas sensor, a temperature and humidity and cavity cover switch test circuit, a data storage circuit, a communication interface circuit, a heating control circuit and a power supply circuit, the sub-detector includes a gas sensor and its heating voltage conversion and voltage-current conversion circuit.
Description
Technical field
The invention belongs to the gas detection analysis technical field.Relate to a kind of gas detection analyzer, be specially adapted to liquefied petroleum gas (LPG) (LPG) and transport leakage real-time detection in the process safely with temperature and humidity compensation function.
Background technology
The leakage accident of liquefied petroleum gas tank vehicle happens occasionally in recent years, brings threat for the people's lives and properties.The saturated vapour pressure height of liquefied petroleum gas (LPG) (50 ℃ time be 116MPa), flash-point, burning-point are low, and the explosion limits scope is approximately 2%～10%.In case generation leakage accident, the liquefied gas that leaks spreads rapidly along ground, in on a large scale, form explosive mixture, volume can reach 5000 liters after 1 kilogram of liquefied gas all gasified, if can form 25 cubic metres of damps with the calculating of 2% concentration, its brisance is equivalent to the explosive yield of 10 kilograms of TNT explosives.The shock wave that blast forms not only can make building collapsing, and moment formation large volume space flame, and destructive power is extremely strong.Mechanical tensimeter and level gauge only are installed on the present liquefied petroleum gas tank/tank car, without any leakage monitoring equipment.Because liquefied petroleum atmospheric pressure height (generally being higher than 2Mpa) in jar case, easily vaporization has only the variation that just may observe pressure and liquid level when serious leakage accident takes place, the accidental risk height.On the partial liquefaction petroleum gas haulage vehicle GPS/GPRS terminal system has been installed, can send vehicle location and velocity information to control center in real time, but when having an accident, can only notify relevant departments to site disposal, the efficient that has reduced accident treatment and in time taken precautions against by driver or supercargo.
Summary of the invention
The purpose of this invention is to provide a kind of real-time leak detector of liquefied petroleum gas (LPG) with temperature and humidity compensation function that can be applicable to the liquefied petroleum gas (LPG) transportation, make full use of vehicle-mounted GPS/GPRS terminal, real-time monitoring information is sent to Master Control Center by the GPS/GPRS communicating terminal at any time, and start warning device caution driver and personnel on every side.
Technical scheme of the present invention is, to easy each mouthful installation environment sensing probe that leaks of LPG cyoinders case, information by single-chip machine information processing enter detection probe and to detected information handle, temperature and humidity compensation and divided rank, and the information after will handling sends to the GPS/GPRS terminal by serial ports, starts acoustooptic alarm system according to leakage class and reports to the police.The position that the LPG cyoinders case is revealed easily in the transportation mainly is three accents, immediate shipment discharge port, air inlet/outlet and population, so detector comprises a main detector and two secondary detectors, correspondence is installed near three accents respectively.Main detector is mainly handled the unit by information Control and is popped one's head in by the environment sensitive that a gas sensor, humidity-sensitive element and temperature sensing element are formed and forms.The environment sensitive external corresponding signal conditioning circuit of popping one's head in, analog to digital conversion circuit is link information control and processing unit then, finish to the quantification of environment temperature and humidity with to the temperature and humidity compensation of gas sensor signal by information process unit, and the conversion of signals after will compensating is the concentration of LPG gas in the monitoring of environmental, according to default leakage class leakage situation is divided and defined, at last with humiture, information such as leakage class and time is sent to the GPS/GPRS terminal by serial ports, judge whether to start sound light alarming circuit according to leakage class and report to the police, and information is sent to Master Control Center by this terminal.Two secondary detectors respectively comprise a gas sensor and signal conditioning circuit and voltage-to-current signaling conversion circuit, are the current signal of 4-20mA with the conversion of signals on the sensor, link to each other with main detector by lead.The used circuit of major and minor detector is present prior art, realizes easily.According to the slow characteristics of gas diffusion velocity, be averaged by repeated detection, front and back data variation analysis-by-synthesis has judged whether liquefied petroleum gas leakage, can avoid interference, thereby this gas detection analyzer have stronger leakage identification and analysis and antijamming capability owing to vibrations, fume and flue gas etc.Total system comprise environment sensitive probe, sample circuit, information processing and control center, to gas sensor add thermal control units, the storage data E
2The warning circuit and the power circuit of PROM, RS232 interface, overload alarm.Among the present invention, the environment sensitive probe comprises gas sensor, humidity sensor and temperature sensor.Control center mainly comprises A/D conversion, Signal Pretreatment, information fusion and temperature and humidity compensation technology by chip microcontroller.
Effect of the present invention and benefit be the tank/tank car for liquefied petroleum gas (LPG) transportation usefulness designed science, effective leakage real time probe, leakage situation by continual detection liquefied petroleum gas (LPG), finding to leak the back evacuates by sound and light alarm notice surrounding population, notify automobilist and supercargo in time take measures leak stopping and report to control center, control center according to circumstances monitors the scene, can farthest reduce the loss of lives and properties aspect, reduce accidental risk, the measure of improving the precaution realizes transporting safely of liquefied petroleum gas (LPG).
Description of drawings
Fig. 1 is a liquefied petroleum gas leakage detector theory diagram of the present invention.
Wherein (I) is main detector environment sensitive probe, and (II) (III) be secondary detector, (IV) be alarm unit, (V) is power module and (VI) be the main detector mainboard.
Fig. 2 is the environment sensitive probe circuit schematic diagram of main detector of the present invention.
Fig. 3 is a secondary detector circuit schematic diagram of the present invention.
Fig. 4 is power circuit principle figure of the present invention.
Fig. 5 is the motherboard circuit schematic diagram of main detector of the present invention.
Embodiment
Below in conjunction with technical scheme and accompanying drawing, be described in detail the specific embodiment of the present invention from two aspects of hardware and software.According to theory diagram, the embodiment of each unit of hardware components is as follows:
(I) main detector environment sensitive probe
As the compressed petroleum gas sensing probe, temperature and humidity detects the sensor that adopts Pt1000 and HIH3610 model respectively with the TGS2611 type sensor of Japanese Figaro company in the present invention.Adopt the state of opening and the off status of Hall element monitoring enclosed cavity, do not close fashionablely when detecting enclosed cavity, start warning system, caution driver and supercargo close the chamber lid.When illegally opening the chamber, also start warning system.The environment sensitive probe circuit schematic diagram of main detector is seen Fig. 2.
(II) (III) secondary detector
This part mainly comprises the voltage-to-current modular converter that adds the gentle sensor signal of thermal control units of gas sensor.Secondary detector is installed in the overhead entrance and the air inlet/outlet of LPG jar case, because LPG jar case size is bigger, about about 10 meters of distance between the major-minor detector, sensor signal is converted to current signal between the 4-20mA, be wired to main detector then, can reduce the loss of voltage on the circuit.The circuit theory diagrams of secondary detector are seen Fig. 3.
(IV) warning circuit
This partial circuit mainly comprises audible alarm (big decibel siren is reported to the police) and light warning (showing the gas leakiness by LED light) circuit, can be by power supply of GPS/GPRS terminal and control, when receiving the warning message that the detector serial ports sends over, start according to leakage class.This part is installed in the pilothouse of haulage vehicle, in time notifies driver and supercargo.
(V) power unit circuit
Detector adopts automobile power source power supply (24V), mainly comprises low pressure and overvoltage crowbar, supply voltage monitoring circuit and DC-DC modular converter.When being lower than normal working voltage, supply voltage sends low pressure alarming information.The circuit theory diagrams of this part are seen Fig. 4.
(VI) main detector mainboard
The main detector mainboard is a System Control Center, mainly comprises single-chip microcomputer and peripheral circuit thereof, finishes the control of gas sensor mode of operation, to the controlling of sampling of gas, temperature, humidity sensor, and the timing of control system, serial communication etc.The typical peripheral circuit of single-chip microcomputer mainly comprises storer (calibration value and constant values such as various compensating parameters, warning limit that are used for storage sensor) and serial ports (being used to be connected the GPS/GPRS communication module, the transmission detection information).According to the information transmission distance, when the distance between main detector and the GPS/GPRS module surpasses 15 meters, add the long line acceptance/transmitter of RS232 in the communication line, widen the transmission range of signal.The circuit theory diagrams of main detector mainboard are seen Fig. 5.
Software section is the core of detector, mainly is control and the information process unit that embeds in the single-chip microcomputer.Detection control, A/D conversion, storage, calendar scheduling all are general Single Chip Microcomputer (SCM) program, are easy to programming.At this detector, the temperature and humidity compensation of gas sensor and concentration conversion method are the cores of software.Concrete detection method of the present invention is as follows:
Adjust the build-out resistor of sensor, make that the voltage on the sensor resistance is about 3V, just the voltage signal on the build-out resistor is about 0.3V, Vcc=3.3V.This moment, build-out resistor was about 5Kohm.
The signal of repeated detection environment temperature, humidity and gas sensor is averaged.According to the conversion table of Temperature Humidity Sensor, obtain current environment temperature and envionmental humidity.
Record environment temperature T (℃), relative humidity RH (%) calculates temperature and humidity compensation coefficient a
When RH＜40%, a=-0.027*T+2.0533;
When 40%＜RH＜55%, a=-0.025*T+1.72;
When 55%＜RH＜80%, a=-0.022*T+1.47;
When 80%＜RH, a=-0.0217*T+1.34.
According to the temperature and humidity compensation coefficient, the gas sensor voltage signal VLs that compensation AD is converted to; Signal VL0 after the compensation is VL0=a*VLs
According to the matching voltage signal VL0 after the compensation, calculate gas concentration Conc
log
10Conc＝2.3767*log
10VL0+2.9289
The both sides inverse logarithm is tried to achieve gas concentration Conc (ppm).
Tell leakage class
When Conc＜LEVEL1, do not leak;
When LEVEL1＜Conc＜LEVEL2, micro-leakage;
When LEVEL2＜Conc, the violent leakage.
Wherein LEVEL1 and LEVEL2 determine according to actual conditions.(be initially set to LEVEL1=3000ppm, LEVEL2=8000ppm)
Claims (5)
1. a liquefied petroleum gas tank/tank car transports leakage real time probe, comprise a main detector and two secondary detectors, main detector is installed in the charging discharging opening of LPG cyoinders case bottom, two secondary detectors are installed in the population and the air inlet gas outlet of jar box top respectively, it is indoor that alarm unit is installed in car steering, it is characterized in that, comprise the environment sensitive probe in the main detector, control and information fusion center and the gas sensor testing circuit that is attached thereto, temperature sensing circuit, humidity measuring circuit, chamber lid switch testing circuit, data storage circuitry, communication interface circuit, heating control circuit and power circuit; Comprise gas sensor and heating voltage change-over circuit thereof, current/charge-voltage convertor in the secondary detector; Main detector has been embedded in the temperature and humidity compensation and the concentration transfer algorithm of gas sensor.
2. a kind of liquefied petroleum gas tank/tank car transportation leakage real time probe according to claim 1, it is characterized in that, described control and information fusion center are by the MSP430F149 chip microcontroller, the heater circuit of gas sensor partly adopts the DC voltage conversion between the voltage stabilizing control module LM2576 realization 2V-15V, storer uses the EEPROM of 256K capacity, adopt MAX3221 to realize the level conversion of single-chip microcomputer RS232 mouth, gas sensor and temperature sensing circuit adopt wheatstone bridge to realize, adopt AD694 to realize sensor voltage signal is converted to the 4-20mA current signal.
3. a kind of liquefied petroleum gas tank/tank car transportation leakage real time probe according to claim 1, it is characterized in that, have or not and leak degree that gas leaks use the method for repeated detection Comprehensive Assessment to obtain, and detection signal uses described temperature and humidity compensation algorithm and concentration transfer algorithm to convert leakiness information to.
4. a kind of liquefied petroleum gas tank/tank car transportation leakage real time probe according to claim 1 and 2, it is characterized in that, after detector detects leakage information and chamber lid unlatching information, send warning message to the GPS/GPRS terminal module by serial ports, start alarm module according to leakage class, and leakage information is sent to Master Control Center.
5. a kind of liquefied petroleum gas tank/tank car transportation leakage real time probe according to claim 1 and 2 is characterized in that use the Vehicular accumulator cell power supply, power pack increases low pressure/overvoltage crowbar and power supply low pressure alarming point road.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510200754 CN1822065A (en) | 2005-11-28 | 2005-11-28 | Leakage real time probe for liquefied petroleum gas tank/tank car while transport |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825595A (en) * | 2010-05-04 | 2010-09-08 | 电子科技大学 | Device with quick response and double gas sensors |
| CN102467804A (en) * | 2010-11-19 | 2012-05-23 | 鸿富锦精密工业（深圳）有限公司 | Security sensing system for fire disaster and method thereof |
| CN102620768A (en) * | 2012-02-28 | 2012-08-01 | 江阴市富仁高科股份有限公司 | Sensor combination device for storage tank vehicle |
| CN104422565A (en) * | 2013-08-27 | 2015-03-18 | 福特全球技术公司 | Battery pack leak detection assembly and method |
| CN104536317A (en) * | 2014-12-16 | 2015-04-22 | 大连理工大学 | Dangerous chemical transport data transmitting system and method |
| CN105445340A (en) * | 2014-08-29 | 2016-03-30 | 中国石油化工股份有限公司 | Method and apparatus for measuring content of hydrogen sulfide in crude oil, and crude oil transportation safety monitoring method and apparatus thereof |
| CN105987795A (en) * | 2015-02-12 | 2016-10-05 | 比亚迪股份有限公司 | Water inflow detection device of battery box and detection method |
| CN107643100A (en) * | 2016-07-21 | 2018-01-30 | 西安定华电子股份有限公司 | A kind of tank car Integrated Measurement System that can efficiently judge leakage |
| CN110426492A (en) * | 2019-08-01 | 2019-11-08 | 无锡格林通安全装备有限公司 | A kind of test method of gas detector, apparatus and system |
| CN113283705A (en) * | 2021-04-24 | 2021-08-20 | 深圳市中燃科技有限公司 | TMS-based liquefied petroleum gas transportation method, system, equipment and medium |
-
2005
- 2005-11-28 CN CN 200510200754 patent/CN1822065A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825595A (en) * | 2010-05-04 | 2010-09-08 | 电子科技大学 | Device with quick response and double gas sensors |
| CN101825595B (en) * | 2010-05-04 | 2012-07-18 | 电子科技大学 | Quick resonse device with double gas sensors |
| CN102467804A (en) * | 2010-11-19 | 2012-05-23 | 鸿富锦精密工业（深圳）有限公司 | Security sensing system for fire disaster and method thereof |
| CN102620768A (en) * | 2012-02-28 | 2012-08-01 | 江阴市富仁高科股份有限公司 | Sensor combination device for storage tank vehicle |
| CN104422565A (en) * | 2013-08-27 | 2015-03-18 | 福特全球技术公司 | Battery pack leak detection assembly and method |
| CN105445340A (en) * | 2014-08-29 | 2016-03-30 | 中国石油化工股份有限公司 | Method and apparatus for measuring content of hydrogen sulfide in crude oil, and crude oil transportation safety monitoring method and apparatus thereof |
| CN104536317A (en) * | 2014-12-16 | 2015-04-22 | 大连理工大学 | Dangerous chemical transport data transmitting system and method |
| CN105987795A (en) * | 2015-02-12 | 2016-10-05 | 比亚迪股份有限公司 | Water inflow detection device of battery box and detection method |
| CN105987795B (en) * | 2015-02-12 | 2019-04-19 | 比亚迪股份有限公司 | A kind of water inlet detecting device and its detection method of Battery case |
| CN107643100A (en) * | 2016-07-21 | 2018-01-30 | 西安定华电子股份有限公司 | A kind of tank car Integrated Measurement System that can efficiently judge leakage |
| CN110426492A (en) * | 2019-08-01 | 2019-11-08 | 无锡格林通安全装备有限公司 | A kind of test method of gas detector, apparatus and system |
| CN110426492B (en) * | 2019-08-01 | 2022-04-19 | 无锡格林通安全装备有限公司 | Testing method, device and system of gas detector |
| CN113283705A (en) * | 2021-04-24 | 2021-08-20 | 深圳市中燃科技有限公司 | TMS-based liquefied petroleum gas transportation method, system, equipment and medium |
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