CN104089918A - Oil gas online detection device based on non-dispersed infrared method - Google Patents
Oil gas online detection device based on non-dispersed infrared method Download PDFInfo
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Abstract
The invention discloses an oil gas online detection device based on a non-dispersed infrared method. The device comprises an active gas extraction unit, an oil gas concentration detection unit, an oxygen and temperature/humidity measurement unit, an analysis host and a work station. Based on the infrared spectroscopy, the device improves the detection precision of oil gas concentration; the diameter of an infrared analysis room is 25mm, the service life of the device is effectively prolonged and the sensitivity of the device is effectively improved; an 8-point mechanical stainless steel pipeline at the oil gas danger source field is adopted for absorbing gas, and an anti-explosion analyzer is installed outside an oil depot to reduce the explosion risk of oil gas; meanwhile, by adopting 8 gas sampling pre-extraction paths, the oil gas concentration at each point can be detected online in real time; with a high-frequency electromagnetic valve and the developed combined type control valve body, accurate supply of analysis gas source to each path of gas is guaranteed, and the position signal judgment is performed without wrong start or blocking; with the oxygen and temperature/humidity sensor, the alarm reliability is improved; by adopting a CAN bus, long-distance transmission of the alarm signal is realized, and the reliability is improved.
Description
Technical field
The invention belongs to oil and gas testing technique field, relate in particular to a kind of oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method.
Background technology
Flammable explosive gas on-line monitoring, transducer calibration technology have become key link and the technical foundation of security monitoring, environmental warning at present, simultaneously for safety assessment provides Data support and Theoretical Criterion.The oil and gas industry standard Sy6503-2008 of People's Republic of China (PRC) regulation: exist the place of inflammable gas source of release should establish inflammable gas detection alarm system.
Fuel-air mixture explosion is typical gas burst, and gas burst is one of principal mode of commercial production and sphere of life explosion disaster.The petroleum products storing in oil depot mostly has effumability, when the concentration of oil gas and air mixture is in explosive range, if run into ignition energy, at once can blast, the concentration of oil gas and air mixture can not blasted during higher or lower than the bound of explosive range.
Flammable explosive gas on-line monitoring has become key link and the technical foundation of security monitoring, environmental warning at present, simultaneously for safety assessment provides Data support and Theoretical Criterion.Traditional gas on-line monitoring technique mainly contains vapor-phase chromatography, gas sensor method, Fourier's infra-red sepectrometry, photocaustic spectroscopy etc., but there is sampling complexity, cross sensitivity in these methods in actual use,, long-time stability are poor, detection gas composition is complete not, high in cost of production shortcoming.
Present stage is used more catalytic combustion type detection method to have following drawback:
Inductor monitoring range: catalytic combustion inductor has a fixing exposure limit of power, and within the scope of this, Monitoring Performance is reliable.Surpass use and the overload of inductor load of monitoring range, affect its accuracy, sensor is also correspondingly often in state of saturation; Gas concentration, lower than normal ranges, can weaken the signal of reflection, adds ambient noise interference, makes instrument readings inaccurate, thereby has reduced accuracy and the resolution of instrument.
Gas cross to be measured impact: catalytic combustion sensor is at low temperatures under (200～400 ℃), to realize the concentration of the process of organic complete oxidation being determined to gas by catalyzer.This course of reaction is very common to a lot of gas.The cross influence of gas to be measured makes testing result can not reflect the actual content that detects gas, and testing result loses scientific value and rationality.
The life problems of sensor: the catalyst failure of catalytic combustion and catalyzer poisoning is the fatal disadvantage of this sensor.The equal average life factor of catalytic combustion sensor, MaLS is in air 2 years, after 6 months, sensitivity will constantly decline substantially, need to can maintain use by debugging repeatedly.
NDIR (non-spectral) infrared gas analyzer is as a kind of gas analysis technology fast and accurately, and pollutant monitoring system and motor-vehicle tail-gas detect in application very general especially continuously.Groundwork principle is that to utilize gas be the funtcional relationship of gas concentration to the selective absorption of infrared radiation and its absorption intensity, realizes the detection of oil gas gas concentration.This system is converted into voltage signal by infrared intensity, by digital processor analyses voltage signal, realizes the accurate measurement to gas concentration.
But there is following defect in Non-Dispersive Infra-red (NDIR) gas analyzer at present when measuring oil depot oil gas: the one, do not consider that oil gas polycomponent forms and the feature of easy absorption, on the gas concentration sensor construction of design, there is defect, cause gas concentration measurement to have certain error; The 2nd, do not consider the impact on oil gas explosion limits of temperature, humidity and oxygen concentration, not accurate enough on Alarm; The 3rd, there is no to consider the oil gas sampling flow process when restricted clearance oil gas multiple spot is measured simultaneously.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method, is intended to solve the gas concentration measurement that current Non-Dispersive Infra-red (NDIR) gas analyzer exists when measuring oil depot oil gas and has error; Do not consider the impact on oil gas explosion limits of temperature, humidity and oxygen concentration, not accurate enough on Alarm; There is no to consider the problem of oil gas sampling flow process when restricted clearance oil gas multiple spot is measured simultaneously.
The embodiment of the present invention is to realize like this, an oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method, should comprise by the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method: the active unit of bleeding, gas concentration detecting unit, oxygen and temperature and humidity measurement unit, analysis main frame, CAN bus, workstation;
The active unit of bleeding is for gathering mixed gas by being arranged on 8 sampling spots in oil product storage storehouse;
Gas concentration detecting unit, oxygen and temperature and humidity measurement unit are connected with the active unit of bleeding, and gather oxygen concentration and the temperature and humidity of mixed gas for measuring the active unit of bleeding;
Analyze main frame and be connected with gas concentration detecting unit, oxygen and temperature and humidity measurement unit, for mixed gas gas concentration, oxygen concentration and temperature and humidity that gas concentration, oxygen, temperature and humidity measurement unit are measured, analyze, and show;
Workstation is connected with analysis main frame by CAN bus, mixed gas gas concentration, oxygen concentration and the temperature and humidity of receiving and analyzing host analysis, if gas concentration surpasses upper explosion limit, send warning, realize the grading forewarning system monitoring of oil gas dangerous matter sources and report to the police.
Further, the active unit of bleeding adopts on-the-spot 8 mechanical type stainless steel pipelines air-breathing.
Further, on-the-spot 8 air-breathing employing high-frequency electromagnetic valves of mechanical type stainless steel pipeline and research and development modular control valve body.
Further, gas concentration detecting unit is comprised of infrared-gas absorption chamber, infrared light supply and infrared eye and amplifying circuit; Specific works principle is: light source part is modulated into continuous infrared radiation the chopped radiation of 6.25Hz, alternately (single tube is every half air chamber the analysis limit by air chamber and reference limit again, reference limit is sealing and is not absorbing ultrared high pure nitrogen), finally by detecting device (detecting device that this instrument adopts is cholic acid lithium pyroelectricity detecting device), absorbed.When analysis room passes into high pure nitrogen, the reference limit that detecting device alternately receives is equal with analysis limit infrared energy, and the output signal of instrument is zero; When analysis room passes into gas to be measured, the reference signal that detecting device receives is constant, and analytic signal is because the absorption of gas to be measured in analysis room changes, then just produce one to the proportional output signal of gas concentration to be measured.This small electric signal becomes and the proportional DC signal of gas concentration to be measured by a plurality of links such as preposition amplification, main amplification, frequency-selecting, phase sensitive detection and filtering.
Further, infrared analysis chamber diameter is 25mm.
Further, infrared analysis chamber adopts one-shot forming processing technology, at air chamber inwall, adopts the thick whole Gold plated Layer of 1mm, and the sealed at both ends material of air chamber is surveyed and adopted the gemstone lens of the high grade of transparency bonding.
Further, the setting height(from bottom) of the unit of bleeding is in 1m, the turning in oil product storage storehouse and size, the structural change place mounting points of attaching most importance to.
Further, analyzing main frame is comprised of Single-chip Controlling, TFT colour liquid crystal display device, A/D change-over circuit, digital interface circuit.
Oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method provided by the invention, first based on infra-red sepectrometry, measures the content of each component in common gas-oil mixture by obtaining the intensity of characteristic absorption peak; Obtain oil gas has strong, single absorption peak near 3.39 μ m, and carries out according to this design of gas concentration detecting unit, has improved the precision detecting; The infrared analysis chamber of design, diameter is 25mm, be the 3-6 of conventional infrared analysis chamber doubly, contamination resistance increases 3-6 doubly, long-life and sensitivity in measuring process have been increased efficiently, and in the loss problem for infrared light path, a whole set of infrared analysis chamber adopts one-shot forming processing technology, at air chamber inwall, adopt the thick whole Gold plated Layer of 1mm, the sealed at both ends material of air chamber is surveyed and is adopted the gemstone lens of the high grade of transparency bonding, make form that infrared light that infrared light supply sends approaches zero loss through optics air chamber, guaranteed accurately the analysis ability of analyser; Employing is air-breathing from on-the-spot 8 the mechanical type stainless steel pipelines of oil gas dangerous matter sources, and explosion-proof analysis meter is arranged on outside oil depot, has reduced oil gas risk of explosion, adopts the 8 tunnel gas samplings road of bleeding in advance simultaneously, can detect each point gas concentration by real-time online; Employing high-frequency electromagnetic valve and research and development modular control valve body, guarantee the accurate supply analysis source of the gas of Liao Duimei road gas, position signalling judgement, and error-free startup, nothing are stopped up; Oxygen, temperature and moisture sensors are set; Adopt CAN bus, realized the long-distance transmissions of alerting signal, improved reliability.Of the present invention simple in structure, preferably resolve the gas concentration measurement that current Non-Dispersive Infra-red (NDIR) gas analyzer exists when measuring oil depot oil gas and have error; Do not consider the impact on oil gas explosion limits of temperature, humidity and oxygen concentration, not accurate enough on Alarm; There is no to consider the problem of oil gas sampling flow process when restricted clearance oil gas multiple spot is measured simultaneously.
Accompanying drawing explanation
Fig. 1 is the oil gas on-line measuring device structural representation based on Non-Dispersive Infra-red (NDIR) method that the embodiment of the present invention provides;
Fig. 2 is the schematic diagram of 8 sampling spots in the oil product storage storehouse that provides of the embodiment of the present invention;
Fig. 3 is the analysis main frame that provides of the embodiment of the present invention and the structural representation of workstation;
In figure: 1, oxygen and temperature and humidity measurement unit; 2, the active unit of bleeding; 3, analyze main frame; 4, workstation; 5, gas concentration detecting unit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
As shown in Figure 1, the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method of the embodiment of the present invention is mainly comprised of oxygen and temperature and humidity measurement unit 1, the active unit 2 of bleeding, analysis main frame 3, workstation 4, gas concentration detecting unit 5;
The active unit 2 of bleeding is for gathering mixed gas by being arranged on 8 sampling spots in oil product storage storehouse;
Gas concentration detecting unit 5, oxygen and temperature and humidity measurement unit 1 are connected with the active unit 2 of bleeding, and gather gas concentration detecting unit, oxygen concentration and the temperature and humidity of mixed gas for measuring the active unit 2 of bleeding;
Analyzing main frame 3 is connected with gas concentration detecting unit 5, oxygen and temperature and humidity measurement unit 1, for mixed gas gas concentration, oxygen concentration and temperature and humidity that gas concentration, oxygen, temperature and humidity measurement unit 1 are measured, analyze, and show;
Workstation 4 is connected with analysis main frame 3 by CAN bus, mixed gas gas concentration, oxygen concentration and temperature and humidity that receiving and analyzing main frame 3 is analyzed, if gas concentration surpasses upper explosion limit, send warning, realize the grading forewarning system monitoring of oil gas dangerous matter sources and report to the police;
In an embodiment of the present invention, the active unit of bleeding adopts on-the-spot 8 mechanical type stainless steel pipelines air-breathing; On-the-spot 8 air-breathing employing high-frequency electromagnetic valves of mechanical type stainless steel pipeline and research and development modular control valve body, gas concentration detecting unit is comprised of infrared-gas absorption chamber, infrared light supply and infrared eye and amplifying circuit.Specific works principle is: light source part is modulated into continuous infrared radiation the chopped radiation of 6.25Hz, alternately (single tube is every half air chamber the analysis limit by air chamber and reference limit again, reference limit is sealing and is not absorbing ultrared high pure nitrogen), finally by detecting device (detecting device that this instrument adopts is cholic acid lithium pyroelectricity detecting device), absorbed.When analysis room passes into high pure nitrogen, the reference limit that detecting device alternately receives is equal with analysis limit infrared energy, and the output signal of instrument is zero; When analysis room passes into gas to be measured, the reference signal that detecting device receives is constant, and analytic signal is because the absorption of gas to be measured in analysis room changes, then just produce one to the proportional output signal of gas concentration to be measured.This small electric signal becomes and the proportional DC signal of gas concentration to be measured by a plurality of links such as preposition amplification, main amplification, frequency-selecting, phase sensitive detection and filtering;
Infrared analysis chamber diameter is 25mm; Infrared analysis chamber adopts one-shot forming processing technology, at air chamber inwall, adopts the thick whole Gold plated Layer of 1mm, and the sealed at both ends material of air chamber is surveyed and adopted the gemstone lens of the high grade of transparency bonding; The setting height(from bottom) of unit of bleeding is in 1m, the turning in oil product storage storehouse and size, the structural change place mounting points of attaching most importance to; Analyzing main frame is comprised of Single-chip Controlling, TFT colour liquid crystal display device, A/D change-over circuit, digital interface circuit.Analyzing main frame 3 is comprised of Single-chip Controlling, TFT colour liquid crystal display device (150 * 100VGA), A/D change-over circuit, digital interface circuit.
In conjunction with Fig. 1-Fig. 3, principle of work of the present invention is described further:
The present invention is at oil depot restricted clearance, monitored mixed gas is sent into gas concentration detecting unit, oxygen and temperature and humidity measurement unit by the active unit of bleeding, analysis main frame by on-line monitoring Non-Dispersive Infra-red (NDIR) completes concentration determination analysis, then pass through CAN bus transfer to the workstation of pulpit, if gas concentration surpasses upper explosion limit, send warning, different from general combustible gas detector device; Apparatus of the present invention consider that oil gas explosion ratio is relevant with temperature, humidity and oxygen concentration, so system be coupled oxygen, temperature and humidity measurement unit simultaneously;
Can according to the time period, open successively the by-pass valve control of each measurement point, respectively the parameters such as the oil gas of different measuring point, oxygen, humiture be measured one by one, import tank indoor scene sensing data into analysis main frame and show; By CAN bus, directly the data on analysis main frame are sent to background work station, pulpit again and carry out the processing of grading forewarning system software analysis, grading forewarning system monitoring and the warning of realization to oil gas dangerous matter sources, especially in the design of sampling, adopt on-the-spot 8 mechanical type stainless steel pipelines air-breathing, explosion-proof analysis meter is arranged on outside oil depot, thereby reduced greatly the risk that oil gas is analyzed, guarantee tank indoor without any Circuits System, that avoids causing because measure lights;
Analyzing host computer system is comprised of Single-chip Controlling, TFT colour liquid crystal display device (150 * 100VGA), A/D change-over circuit, digital interface circuit, the independently developed control software with menu in Chinese; Power control system can adopt AC:20-27V according to actual conditions; 70-250V (50Hz), DC:20-36V; 70V-250, exports two AC/DC power modules and is respectively the power supply of microsystem and three-way solenoid valve, transformer and+5V output stabilized voltage supply and+5V input, ± 12V output DC/DC boost module are other parts power supplies of measuring system;
Advantage of the present invention is:
1), based on infra-red sepectrometry, the logical intensity that obtains characteristic absorption peak is measured the content of each component in common gas-oil mixture (gasoline, diesel oil and kerosene etc.); Obtain oil gas has strong, single absorption peak near 3.39 μ um, carries out the design of gas concentration detecting unit according to this key character, has improved the precision detecting;
2) for long-time measuring state, the absorption of oil gas, small dust granule in the humidity of gas and gas all will be the key index that impact is measured, and common infrared analysis air chamber, maximum diameter only has 8mm, minimum diameter only has 4mm, after measuring for a long time, above several factors can directly be attached on the inwall of analysis room, like this in little air chamber space, directly infrared light is had to high loss, thereby cause the decline that sensitivity is very fast, cause analytical instrument not measure accurately, strong adhesive ability for oil gas, the large space infrared analysis chamber of design, diameter is 25mm, be the 3-6 of conventional infrared analysis chamber doubly, contamination resistance increases 3-6 doubly, increased efficiently the long-time sensitivity in measuring process, and in the loss problem for infrared light path, a whole set of infrared analysis chamber adopts one-shot forming processing technology, at air chamber inwall, adopt the thick whole Gold plated Layer of 1mm, the sealed at both ends material of air chamber is surveyed and is adopted the gemstone lens of the high grade of transparency bonding, make form that infrared light that infrared light supply sends approaches zero loss through optics air chamber, thereby guaranteed accurately the analysis ability of analyser,
3) in the design of sampling, employing is air-breathing from on-the-spot 8 the mechanical type stainless steel pipelines of oil gas dangerous matter sources, and explosion-proof analysis meter is arranged on outside oil depot, has reduced oil gas risk of explosion, adopt the 8 tunnel gas samplings road of bleeding in advance simultaneously, can detect each point gas concentration by real-time online; Adopt high-frequency electromagnetic valve and research and development modular control valve body, unique box-like switching gas circuit of design team, in relative small size, completing gas circuit fast switches, the analysis instruction that simultaneously coordinates analyser, the gas circuit that need to control instruction responds in time, thereby guarantee the accurate supply analysis source of the gas of Dui Mei road gas, position signalling is judged, error-free startup, nothing are stopped up, in the cellular installation height placement of bleeding, according to oil gas, easily locate at turning etc. to assemble, therefore tentatively determine that setting height(from bottom) is in 1m, turning and size, the structural change place mounting points of attaching most importance to;
4) take into full account the impact on oil gas explosion limits of temperature, humidity and oxygen concentration, arrange at the scene oxygen, temperature and moisture sensors, when dangerous matter sources blast grading forewarning system Software for Design, adopt the method for comprehensive criterion to carry out dangerous matter sources grading forewarning system simultaneously, reduced wrong report.
5) Field Bus CAN design, can carry out alerting signal reliably, long-distance transmissions, and can dock with oil depot supervisory system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method, it is characterized in that, should comprise by the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method: the active unit of bleeding, gas concentration detecting unit, oxygen and temperature and humidity measurement unit, analysis main frame, CAN bus, workstation;
The active unit of bleeding is for gathering mixed gas by being arranged on 8 sampling spots in oil product storage storehouse;
Gas concentration detecting unit, oxygen and temperature and humidity measurement unit are connected with the active unit of bleeding, and gather oxygen concentration and the temperature and humidity of mixed gas for measuring the active unit of bleeding;
Analyze main frame and be connected with gas concentration detecting unit, oxygen and temperature and humidity measurement unit, for mixed gas gas concentration, oxygen concentration and temperature and humidity that gas concentration, oxygen, temperature and humidity measurement unit are measured, analyze, and show;
Workstation is connected with analysis main frame by CAN bus, mixed gas gas concentration, oxygen concentration and the temperature and humidity of receiving and analyzing host analysis, if gas concentration surpasses upper explosion limit, send warning, realize the grading forewarning system monitoring of oil gas dangerous matter sources and report to the police.
2. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 1, is characterized in that, the active unit of bleeding adopts on-the-spot 8 mechanical type stainless steel pipelines air-breathing.
3. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 2, is characterized in that, on-the-spot 8 air-breathing employing high-frequency electromagnetic valves of mechanical type stainless steel pipeline and research and development modular control valve body.
4. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 1, is characterized in that, gas concentration detecting unit is comprised of infrared-gas absorption chamber, infrared light supply and infrared eye and amplifying circuit.
5. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 4, is characterized in that, infrared analysis chamber diameter is 25mm.
6. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 4, it is characterized in that, infrared analysis chamber adopts one-shot forming processing technology, at air chamber inwall, adopts the thick whole Gold plated Layer of 1mm, and the sealed at both ends material of air chamber is surveyed and adopted the gemstone lens of the high grade of transparency bonding.
7. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 1, is characterized in that, the setting height(from bottom) of the unit of bleeding is in 1m, and the turning in oil product storage storehouse and size, structural change place are mounting points.
8. the oil gas on-line measuring device based on Non-Dispersive Infra-red (NDIR) method as claimed in claim 1, is characterized in that, analyzes main frame and is comprised of Single-chip Controlling, TFT colour liquid crystal display device, A/D change-over circuit, digital interface circuit.
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Application publication date: 20141008 |