CN108931561A - Seismological observation escapes trace hydrogen on-line monitoring system and monitoring method with tomography - Google Patents
Seismological observation escapes trace hydrogen on-line monitoring system and monitoring method with tomography Download PDFInfo
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Abstract
The present invention relates to a kind of seismological observation tomographies to escape trace hydrogen on-line monitoring system and monitoring method.Monitoring system includes gas collection pretreatment unit, the first solenoid valve, second solenoid valve, sampling pump, quantity tube, gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump and governor circuit in situ, on Observation of fault activity hole, gas collection pretreatment unit, the first solenoid valve, quantity tube, second solenoid valve, sampling pump and gas outlet in situ are sequentially connected the air intake port cover of gas collection pretreatment unit in situ；First solenoid valve is successively connected through gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump with second solenoid valve again；First solenoid valve, second solenoid valve, sampling pump, circulation air pump and hydrogen gas detector are connected with governor circuit respectively.Operation of the present invention is convenient, can continuously be automatically performed hydrogen measurement in situ, and timeliness is good, and detection sensitivity is high, and accuracy is high, adapts to field Observation of fault activity environment, meets earthquake precursor observation requirement.
Description
Technical field
The present invention relates to seismic precursor underground fluid Gas observation method and observation devices in a kind of geochemical field, especially
It is related to a kind of seismological observation tomography evolution trace hydrogen on-line monitoring system and monitoring method.
Background technique
Tomography is the better channels of earth interior gas transfer and evolution, and creep, the changing of the relative positions and the rupture of tomography are to cause ground
The reason of shake, while the migration that internal gas can be caused different degrees of.Content of the hydrogen in earth's surface air only have 0.5~
1ppm, but there are a large amount of hydrogen for Earth, exist to adsorb the state of dissolved hydrogen and hydrocarbon, mainly pass through fracture
The rock and soil of band are discharged, or are discharged as the GEOTHERMAL WATER of deeper cavity is carried by hot spring dew point.Tomography is answered in construction
It can be slided under power effect, the rock property, the structure of matter on fault plane can change, so as to cause subsurface material, gas
The change of body migration pathway and Migration mark, therefore the evolution of faulting and hydrogen has certain correlation, and tomography hydrogen
Distinguishing feature exactly changes on room and time all larger.
China has started the research of deep evolution hydrogen and Relations To Earthquakes in 70~eighties of 20th century, to 2015
Year, the hydrogen observation station of the China for seismological observation has been approached 20.Currently, common both at home and abroad escape hydrogen observation method
It is to pass through gas-chromatography --- thermal conductivity method taken at regular intervals sample send laboratory testing, and the hydrogen detection of this method is limited to 10ppm.
It is cumbersome, at high cost due to gas chromatograph, and detect limit and be much higher than air background value, continuous observation can not be formed, is led
Cause it ineffective in earthquake precursor observation.
In the prior art, following problems are primarily present to the observation of tomography evolution trace hydrogen：
1. precision is low, the trace hydrogen concentration in air cannot be distinguished from.The density of hydrogen of earth's surface is generally lower, about 0.5~
1ppm, existing observation technology generally can not accurately detect 10ppm trace density of hydrogen below, for seismic precursor tomography
The background observation of gas content observing has a significant impact.
2. existing monitoring system automation degree is low, artifical influence factor is more.Seismic precursor tomography emergent gas
Variation is changed with underground activities, and only continuous observation just facilitates to find the variation of underground activities, and existing monitoring
System is unable to continuous observation, but needs by being just able to achieve observation after manual sampling and transport, therefore can generate large error.
3. formation gas acquisition method causes observation fluctuation big, seismic anomaly cannot be distinguished vulnerable to environmental disturbances.It is modern
Mankind's activity and the influence lived to seismological observation are very big, and the variation for easily causing observing environment causes observation to increase extremely,
Many difficulties are brought to earthquake precursor observation analysis.
Summary of the invention
In order to solve the above-mentioned technical problem the present invention, provides a kind of seismological observation tomography evolution trace hydrogen on-line monitoring
System and monitoring method, automation and intelligentification degree is high, can measure air background value, can continuously be automatically performed hydrogen in situ
Measurement, timeliness is good, and accuracy is high, adapts to field Observation of fault activity environment, meets earthquake precursor observation requirement.
Another object of the present invention is to provide a kind of seismological observation tomography evolution trace hydrogen on-line monitoring system and monitoring
Method excludes environmental impact factor, carries out environmental factor amendment to the hydrogen value that measures, improve hydrogen detection accuracy and can
By property, the environmental suitability of monitoring system is improved.
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals：Seismological observation of the invention
With tomography escape trace hydrogen on-line monitoring system, including gas collection pretreatment unit in situ, the first solenoid valve, second solenoid valve,
Sampling pump, quantity tube, gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump and governor circuit, it is in situ to collect
The air intake port cover of gas pretreatment unit is on Observation of fault activity hole, gas collection pretreatment unit in situ, the first solenoid valve, quantity tube,
Two solenoid valves and sampling pump are sequentially connected, and the efferent duct of sampling pump connects gas outlet；First solenoid valve and and gas splitter phase
Even, gas splitter, hydrogen gas detector, exhaust gas processing device and circulation air pump are sequentially connected, and recycle the efferent duct of air pump again
It is connected with second solenoid valve；First solenoid valve, second solenoid valve, sampling pump, circulation air pump and hydrogen gas detector are respectively and main
Circuit is controlled to be connected.Gas collection pretreatment unit, the first solenoid valve, quantity tube, second solenoid valve, sampling pump and gas outlet in situ are constituted
Acquire gas circuit；First solenoid valve, gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump, second solenoid valve
Closed circulation, which is constituted, with quantity tube detects gas circuit.The work of acquisition gas circuit, tomography emergent gas are pre-processed through gas collection in situ and are filled first
After setting acquisition and pretreatment, under the drive of sampling pump, the first solenoid valve, quantity tube, second solenoid valve and sampling pump are flowed through, most
It is flowed out afterwards from gas outlet, to determine the volume of sample gas, realizes the quantitative collection of sample gas；Then detection gas circuit work, by circulating air
Pump provides gas circulation power, and for the sample gas after quantifying through the first solenoid valve inflow gas splitter, gas splitter isolates sample
Hydrogen in gas, hydrogen flow into hydrogen gas detector, and hydrogen gas detector exports the transducing signal of reflection density of hydrogen to master control
Circuit, gas flows into vent gas treatment resume module later, finally flows through circulation air pump and flows to second solenoid valve, finally from gas outlet
Discharge.Governor circuit completes human-computer dialogue and the integrated control of system, according to the action command of input, carries out a series of adopt
Gas, measurement operation analyze transducing signal, and data are saved and shown.And there can be network with completion timing automatic measurement
Communication and remote control function.Automation and intelligentification degree of the present invention is high, can continuously be automatically performed hydrogen measurement in situ, timeliness
Good, accuracy is high, adapts to field Observation of fault activity environment, meets earthquake precursor observation requirement.
Preferably, the gas collection pretreatment unit in situ includes gas collecting apparatus and filter device in situ, gas collection in situ
Device is an inverted funnel type cover, and cover covers on Observation of fault activity hole, and the top connecting adapter of cover, adapter passes through
Pipeline is connected with the filter device, and filter device is connected with first solenoid valve again.Funnel type cover is for direct
The gas overflowed in peephole (well) is collected, filter device is for separating the steam in gas and the dust less than 10um
Grain, avoids enter into internal system gas circuit and causes airway blockage.
Preferably, the filter device includes connected dirt catcher and steam-water separator, dirt catcher is located at carbonated drink point
Front end from device, i.e. dirt catcher are connected by pipeline with the adapter, and dirt catcher includes the hydrophobic filter membrane of PTFE, steam-water separation
Device includes Straight quartz ampoule and the spiral quartz ampoule and central tube that are located in Straight quartz ampoule, Straight quartz ampoule, spiral
Quartz ampoule and central, tubular are at three cavitys of steam-water separator, and spiral quartz ampoule is by being helically wound around on central tube, spiral
The inlet end of quartz ampoule is connected with dirt catcher, and the outlet side of central tube is connected with first solenoid valve, Straight quartz ampoule
Inner sealing is filled with coolant liquid.Dirt catcher is used to remove the tiny dust particles in gas, prevents from entering quantity tube, gas separation
The equipment such as column and cause airway blockage.For steam-water separator for separating to the steam in test sample gas, sample gas enters spiral quartz ampoule
Under the action of coolant liquid, condensation vapor enters central tube using the diffusion hole of spiral quartz ampoule at liquid, sample gas, then in
Sample gas is discharged in heart pipe.Filter device mainly removes dust particles and steam in sample gas, and impurity is avoided to enter the inspection of monitoring system
It surveys gas circuit and causes pipeline blockage, improve the stability of monitoring system.
Preferably, the hydrogen gas detector includes hemispherical shell and the hydrogen induction member in shell
Part, shell are tightly connected by planar shaped bottom surface and the hemisphere mask body covered on bottom surface, and the central point of hemisphere mask body is set
There is inlet channel, inlet channel is connected with the gas splitter, and the lower part of hemisphere mask body is equipped with outlet passageway, and outlet is logical
Road is connected with the exhaust gas processing device, and the hydrogen sensing element is located on bottom surface, and hydrogen sensing element is using magnetic
The multi-layer nano laminated film that control sputtering method is coated with, including bottom, middle layer and surface layer, bottom are metal copper film layer, in
Interbed is hydrogen-sensitive semiconductor oxide film layer, and surface layer is palladium --- transition element alloy firm layer, hydrogen sensing element draw
Pin out, pin pass through bottom surface and stretch out shell and be connected with the governor circuit.Have using palldium alloy to hydrogen good
Selectivity, when hydrogen sensing element contacts hydrogen, the surface layer nano thin-film of hydrogen sensing element adsorbs hydrogen molecule, in hydrogen molecule
Atom infiltrate through the atomic layer in film, form palladium hydrogen compound with the palladium atom in film, the generation of noval chemical compound so that
The physical property of film changes, and distortion of lattice causes the electron mobility of film to change, this electron mobility and film
Suction hydrogen concentration it is related, therefore pass through electron mobility you can get it the density of hydrogen of measurement film.Hydrogen gas detector utilizes
Gas increases the contact rate of gas and sensing element, improves detection accuracy in the indoor reflection of hemispherical gas.
Preferably, being equipped with Temperature Humidity Sensor in the shell, Temperature Humidity Sensor is mounted on the hemisphere face of shell
The transducing signal of cover inner wall, Temperature Humidity Sensor output is connected with the governor circuit.The temperature and humidity value of gas is acquired, is used
To exclude environmental impact factor, environmental factor amendment is carried out to the hydrogen value measured, reduces field measurement environmental disturbances factor, mentions
The accuracy and reliability of high hydrogen detection, improves the environmental suitability of monitoring system.
Preferably, the gas splitter is the cylinder of an inner hollow, column body is small filled with porous carbon
The sphere diameter of ball, porous carbon bead is all the same.Gas passes through splitter, because each component is different in the adsorptivity of splitter in gas,
So that Time Inconsistency of the different component by splitter, and hydrogen is that adsorptivity is minimum and the smallest component of atomic radius, because
This passes through splitter earliest.The separate time intervals of hydrogen and other gases only need 2 seconds, improve the detection accuracy of sensor.
Preferably, the exhaust gas processing device is a transparent cylinder, column body has cavity, and having in cavity can
The filter medium of colour developing, filter medium are anhydrous cupric sulfate or discoloration silica gel.Exhaust gas processing device mainly removes hydrogen and induction
Steam after element adsorption reaction, gaseous product after avoiding hydrogen adsorption contacted again with the sensing element of hydrogen gas detector and
Influence transducer sensitivity.Filter medium is replaceable, reduces maintenance cost.
Preferably, the governor circuit includes microprocessor unit, signal processing unit, data storage cell, shows
Show unit, wireless communication unit and provides the power supply unit of operating voltage, the hydrogen gas detector output for governor circuit
Transducing signal be connected with the signal processing unit, signal processing unit, data storage cell, display unit, channel radio
News unit be connected respectively with microprocessor unit, microprocessor unit respectively with first solenoid valve, second solenoid valve, adopt
Sample pump and circulation air pump are connected.Display unit uses touch display screen, realizes human-computer interaction, microprocessor unit is according to input
Action command carries out a series of gas production, measurement operation, and signal processing unit is analyzed and handled to transducing signal, and is sent
Data are saved and are shown by microprocessor unit.Data storage cell includes measured database and system monitoring library, measurement data
Library is named data packet according to earthquake precursor observation industry standard, in addition to concentration data, also incidentally temperature, barometric information；
System monitoring library saves the running log and exception information of system intelligent monitoring, safeguards and provides point for the unattended operation of system
Analyse data.Data storage cell is stored using the symmetrical backup mode of redundancy, prevents storage chip because using overlong time shape
At bad block cause historical data to lose, data can be stored (longest was up to 5 years) with long-time stable, improve the long-term steady of system
It is qualitative.Wireless communication unit realizes telecommunication, convenient for network remote monitoring and remote diagnosis and upgrading, realizes that seismic precursor is seen
Field unattended observation in survey.
Seismological observation of the present invention with tomography escape trace hydrogen on-line monitoring system monitoring method be：The collection in situ
Gas pretreatment unit, the first solenoid valve, quantity tube, second solenoid valve, sampling pump and gas outlet constitute acquisition gas circuit, and described the
One solenoid valve, gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump, second solenoid valve and quantity tube are constituted
Closed circulation detects gas circuit；Acquisition gas circuit work first, tomography emergent gas is through gas collection pretreatment unit in situ acquisition and pre- place
After reason, under the drive of sampling pump, the first solenoid valve, quantity tube, second solenoid valve and sampling pump are flowed through, is finally flowed from gas outlet
Out, to determine the volume of sample gas, the quantitative collection of sample gas is realized；Then detection gas circuit work provides gas by circulation air pump and follows
Gyration power, for the sample gas after quantifying through the first solenoid valve inflow gas splitter, gas splitter isolates the hydrogen in sample gas, hydrogen
Gas flows into hydrogen gas detector, and hydrogen gas detector export the transducing signal of reflection density of hydrogen to the governor circuit, it
Gas flows into vent gas treatment resume module afterwards, finally flows through circulation air pump and flows to second solenoid valve.First quantitative collection, then determined
Amount detection, improves the accuracy of detection.Automation and intelligentification degree of the present invention is high, can continuously be automatically performed hydrogen measurement in situ,
Timeliness is good, and accuracy is high, adapts to field Observation of fault activity environment, meets earthquake precursor observation requirement.
Preferably, Temperature Humidity Sensor is equipped in the hydrogen gas detector, the sensing of Temperature Humidity Sensor output
Signal is connected with the governor circuit；The monitoring method includes environmental factor modification method：It is obtained in advance by experiment
Then the particular curve relationship showed between temperature and humidity and environmental factor is written and is led by the environmental factor under different temperature and humidity conditions
In the signal processing unit for controlling circuit；In actual measurement, signal processing unit receives the hydrogen that hydrogen gas detector is sent and passes
Feel signal and temperature and humidity sensing signal, actually measured density of hydrogen value is modified using environmental factor, is finally passed through
Cross the modified density of hydrogen value of environmental factor.Environmental impact factor is excluded, environmental factor amendment is carried out to the hydrogen value measured, is subtracted
Small field measurement environmental disturbances factor improves the accuracy and reliability of hydrogen detection, improves the environmental suitability of monitoring system.
The beneficial effects of the invention are as follows：It realizes that tomography escapes the continuous sampling of gas by gas collection pretreatment unit in situ, keeps away
Exempt from operating error caused by artificial gas production；Sample air volume is determined by quantity tube, and dividing certainly for gas is realized by gas splitter
From reducing the detection limit of system；The multi-layer nano laminated film that hydrogen sensing element uses magnetically controlled sputter method to be coated with improves
Detection sensitivity；Environmental factor compensation is realized by measuring multiple parameters, avoids the interference in field environment observation, improves hydrogen inspection
The accuracy and reliability of survey improves the environmental suitability of monitoring system.Reach network monitoring by wireless telecommunications and remotely examines
Disconnected purpose realizes the field unattended observation in earthquake precursor observation, reduces O&M cost.Automation and intelligentification of the present invention
Degree is high, easy to operate, can measure air background value, can continuously be automatically performed hydrogen measurement in situ, timeliness is good, accuracy
Height adapts to field Observation of fault activity environment, meets earthquake precursor observation requirement.
Detailed description of the invention
Fig. 1 is a kind of system structure diagram of the invention.
Fig. 2 is a kind of structural schematic diagram of original position gas collection pretreatment unit in the present invention.
Fig. 3 is a kind of schematic cross-sectional view of hydrogen gas detector in the present invention.
Fig. 4 is a kind of circuit theory connection block diagram of governor circuit in the present invention.
1. first solenoid valve in figure, 2. second solenoid valves, 3. third solenoid valves, 4. gas collection pretreatment units in situ, 5. adopt
Sample pump, 6. quantity tubes, 7. gas splitters, 8. exhaust gas processing devices, 9. circulation air pumps, 10. hydrogen gas detectors, 11. bottom surfaces,
12. hemisphere mask body, 13. inlet channels, 14. outlet passageways, 15. hydrogen sensing elements, 16. pins, 17. temperature and humidity sensings
Device, 21. microprocessor units, 22. signal processing units, 23. data storage cells, 24. display units, 25. wireless telecommunications lists
Member, 26. power supply units, 31. sample gas air inlet pipe, 32. air intake ducts, 33. gas outlets, 41. gas collecting apparatus in situ, 42. switchings
Head, 43. dirt catchers, 44. Straight quartz ampoules, 45. spiral quartz ampoules, 46. central tubes.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment：The seismological observation of the present embodiment escapes trace hydrogen on-line monitoring system with tomography, as shown in Figure 1, packet
Include gas collection pretreatment unit 4 in situ, the first solenoid valve 1, second solenoid valve 2, third solenoid valve 3, sampling pump 5, quantity tube 6, gas
Body splitter 7, hydrogen gas detector 10, exhaust gas processing device 8, circulation air pump 9 and governor circuit, third solenoid valve, the first electricity
Magnet valve, quantity tube, second solenoid valve and sampling pump are sequentially connected, third solenoid valve be separately connected sample gas air inlet pipe 31 and air into
Tracheae 32, sample gas air inlet pipe and gas collection pretreatment unit in situ, the air intake port cover of gas collection pretreatment unit in situ is in Observation of fault activity
The efferent duct of Kong Shang, sampling pump connect gas outlet 33；First solenoid valve is connected with gas splitter again, gas splitter, hydrogen
Detection device, exhaust gas processing device and circulation air pump are sequentially connected, and the efferent duct for recycling air pump is connected with second solenoid valve again.It is former
Position gas collection pretreatment unit, third solenoid valve, the first solenoid valve, quantity tube, second solenoid valve, sampling pump and gas outlet, which are constituted, adopts
Collect gas circuit；First solenoid valve, gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump, second solenoid valve and
Quantity tube constitutes closed circulation and detects gas circuit.
As shown in Fig. 2, gas collection pretreatment unit 4 in situ includes gas collecting apparatus 41 and filter device in situ, gas collection dress in situ
Setting is an inverted funnel type cover, and cover covers on Observation of fault activity hole, the top connecting adapter 42 of cover.Funnel type cover
It is the well head of peephole (inspection well) for directly collecting the gas overflowed in peephole (inspection well), below cover, well head is straight
Diameter is generally 110~150mm.Adapter is for being fixedly connected with gas piping.Cover material is that stainless steel, polytetrafluoroethylene (PTFE) etc. are low
Adsorptivity, resistant material, adapter gas outlet are directly generally 10~20mm, and material is corrosion-resistant high molecular material.Filtering
Device includes connected dirt catcher 43 and steam-water separator.Dirt catcher is located at the front end of steam-water separator, and adapter passes through pipeline
It is connected with dirt catcher, dirt catcher includes the hydrophobic filter membrane of PTFE, for removing the tiny dust particles in gas, prevents from entering quantitative
The equipment such as pipe, gas splitter and cause airway blockage, the aperture of filter membrane is 0.45~5 μm.Steam-water separator for separate to
Condensation aqueous vapor in test sample gas, steam-water separator include Straight quartz ampoule 44 and the spiral quartz in Straight quartz ampoule
Pipe 45 and central tube 46, three cavitys of Straight quartz ampoule, spiral quartz ampoule and central, tubular at steam-water separator, spiral stone
By being helically wound around on central tube, the inlet end of spiral quartz ampoule is connected English pipe with dirt catcher, the outlet side of central tube and
One solenoid valve is connected, and Straight quartz closed frame tube is filled with coolant liquid.Sample gas enters spiral quartz ampoule in the effect of coolant liquid
Under, for condensation vapor at liquid, sample gas enters central tube using the diffusion hole of spiral quartz ampoule, then by central tube be discharged sample gas to
Third solenoid valve.Filter device mainly removes dust particles and steam in sample gas, and impurity is avoided to enter the detection of monitoring system
Gas circuit and cause pipeline blockage, improve monitoring system stability.
As shown in figure 3, hydrogen gas detector 10 includes hemispherical shell and the hydrogen sensing element in shell,
Shell is tightly connected by planar shaped bottom surface 11 and the hemisphere mask body 12 covered on bottom surface, forms hemispherical gas chamber, hemisphere
The central point of mask body is equipped with inlet channel 13, and inlet channel is connected with gas splitter, and the lower part of hemisphere mask body is equipped with
Gas channel 14, outlet passageway is connected with exhaust gas processing device, and hydrogen sensing element 15 is located on bottom surface.Hydrogen sensing element is to adopt
The multi-layer nano laminated film being coated with magnetically controlled sputter method, including bottom, middle layer and surface layer.Bottom is metal copper film
Layer, as substrate material, film thickness is 8~450nm；Middle layer is hydrogen-sensitive semiconductor oxide film layer, by 2 layers of sull
Composition, with a thickness of 2~10nm；Surface layer is palladium --- transition element alloy firm layer, with a thickness of 0.5~2nm.Each layer film
Difference of thermal expansion coefficient is no more than 5%.Film is coated with using magnetically controlled sputter method, and the sensitivity of every tunic thickness and sensor has
It closes, the film thickness range of sensing element is 10~500nm.Hydrogen sensing element draws pin 16, and pin passes through bottom surface and stretches out shell.
Temperature Humidity Sensor 17 is also equipped on the inner wall of hemisphere mask body.Hydrogen gas detector is indoor in hemispherical gas using gas
Reflection, increases the contact rate of gas and sensing element, improves detection accuracy.The temperature of Temperature Humidity Sensor detection sample gas,
Humidity data, to realize environmental factor amendment to the density of hydrogen measured.
Gas splitter is the cylinder of an inner hollow, and column body is filled with porous carbon bead, porous carbon bead
Sphere diameter is all the same.Gas passes through splitter, because each component is different in the adsorptivity of splitter in gas, so that different component passes through
The Time Inconsistency of splitter, and hydrogen is that adsorptivity is minimum and the smallest component of atomic radius, therefore passes through splitter earliest.
The length of gas splitter is 35~100cm in the present embodiment, and diameter is 2~4mm, and the sphere diameter of porous carbon bead is 10~40
Mesh, sphere diameter is bigger, and splitter is longer, and separating effect is better, and the separate time intervals of hydrogen and other gases were improved up to 2 seconds
The detection accuracy of sensor.Exhaust gas processing device is a transparent cylinder, column body has cavity, and having in cavity can develop the color
Filter medium, filter medium are anhydrous cupric sulfate or discoloration silica gel.Exhaust gas processing device mainly removes hydrogen and sensing element is inhaled
Steam after reaction enclosure, filter medium is replaceable, reduces maintenance cost.
As shown in figure 4, governor circuit includes microprocessor unit 21, signal processing unit 22, data storage cell 23, shows
Show unit 24, wireless communication unit 25 and provides the power supply unit 26 of operating voltage, signal processing unit, data for governor circuit
Storage unit, display unit, wireless communication unit are connected with microprocessor unit respectively, Temperature Humidity Sensor, hydrogen induction member
The pin that part is drawn is each passed through shell and is connected with signal processing unit, microprocessor unit and respectively with the first solenoid valve, the
Two solenoid valves, third solenoid valve, sampling pump and circulation air pump are connected.Microprocessor unit is the core of governor circuit, is based on
Linux stablizes the exploitation of version kernel, embeds fuzzy control operation unit and Easy manual's intelligence learning unit, can be with measurement sample
Being increasing to carry out self judgment study for this, monitors input signal and judges instrument state, calculate for current scene
Optimization processing scheme, maximum exclusion and correction are given to disturbing factor, to realize the continuous measurement of complete automation, number
According to storage analysis and network communication.Data storage cell includes measured database and system monitoring library, measured database according to
Earthquake precursor observation industry standard is named data packet, in addition to concentration data, also incidentally temperature, barometric information；System prison
Running log and exception information that library saves system intelligent monitoring are surveyed, provides analysis number for the unattended operation maintenance of system
According to.Data memory module is stored using the symmetrical backup mode of redundancy, prevents storage chip because using overlong time to be formed
Bad block causes historical data to lose, and data can be stored (longest was up to 5 years) with long-time stable, improves the steady in a long-term of system
Property.Wireless communication unit realizes telecommunication, convenient for network remote monitoring and remote diagnosis and upgrading, realizes earthquake precursor observation
In field unattended observation.Display unit uses touch display screen, realizes human-computer interaction.Microprocessor unit issues control
Signal controls each solenoid valve and sampling pump, the movement for recycling air pump.When acquiring gas circuit work, by controlling the unlatching of solenoid valve,
The volume of adjustment quantitative pipe determines that the volume of analysis sample, quantitative pipe volume are determined by tomography evolution tolerance, generally 1~
10mL.When closed circulation detects gas circuit work, circulation air pump provides power, and closure follows bad detection gas circuit and do not need carrier gas, with to
Gas is surveyed as background gas.According to the mathematical relationship between the physical property and density of hydrogen of hydrogen sensing element, signal processing
Unit uses FPGA and high-precision DA to constitute adjustable reference signal source of the DDS signal generator as sensor.Signal processing list
Member not only has analog-digital conversion function, but also acquires the signal of Temperature Humidity Sensor, to the hydrogen sensing element signal of acquisition into
Row temperature and humidity non-liner revision.So that the sensitivity of detection hydrogen can reach 10-9, for detection limit lower than 5ppb, raising detection is accurate
The environmental suitability of degree and monitoring system.Microprocessor unit uses adaptive control technology, there is system remote diagnosis to report an error,
Remote upgrade, data automatic transmission function are monitored by each module of the serial communication to system, are realized that automation is continuous and are surveyed
Amount, data storage analysis and network communication.Power supply unit is using mains-supplied and the power supply of the two-way switchable of storage battery power supply
Mode.It charges in the case where there is alternating current to battery and provides power supply for system；Electric power storage is used in the case where mains failure
Pond is system power supply, guarantees system power supply.Power supply is automatically cut off when battery voltage drops to set thresholding low pressure, prevents from storing
There is over-discharge phenomenon in battery.Power supply unit is conducive to system in the long-term ocean weather station observation in field using supplied by AC/DC electricity mode, is
The continuous and steady operation of system provides safeguard, it is ensured that the continuous operating time of system.
Above-mentioned seismological observation with tomography escape trace hydrogen on-line monitoring system monitoring method be：Gas collection pretreatment in situ
Device, third solenoid valve, the first solenoid valve, quantity tube, second solenoid valve, sampling pump and gas outlet constitute acquisition gas circuit；First
Solenoid valve, gas splitter, hydrogen gas detector, exhaust gas processing device, circulation air pump, second solenoid valve and quantity tube composition are closed
Close cycle detection gas circuit；The work of acquisition gas circuit, tomography emergent gas are acquired and are pre-processed through gas collection pretreatment unit in situ first
Afterwards, under the drive of sampling pump, third solenoid valve, the first solenoid valve, quantity tube, second solenoid valve and sampling pump are flowed through, finally
It is flowed out from gas outlet, to determine the volume of sample gas, realizes the quantitative collection of sample gas；Then detection gas circuit work, by circulation air pump
Gas circulation power is provided, for the sample gas after quantifying through the first solenoid valve inflow gas splitter, gas splitter isolates sample gas
In hydrogen, hydrogen flow into hydrogen gas detector, hydrogen gas detector output reflection density of hydrogen transducing signal and temperature and humidity
Signal carries out temperature and humidity non-liner revision, environmental factor amendment to signal processing unit, to the hydrogen sensing element signal of acquisition
Method is：The environmental factor under different temperature and humidity conditions is obtained by experiment in advance, then will be between temperature and humidity and environmental factor
In the signal processing unit of the particular curve relationship write-in governor circuit revealed；In actual measurement, signal processing unit is received
Hydrogen transducing signal and temperature and humidity sensing signal are modified actually measured density of hydrogen value using environmental factor, finally
It obtains and passes through the modified density of hydrogen value of environmental factor, and give microprocessor unit, then display unit is sent to show.Gas flows through
After hydrogen gas detector, vent gas treatment resume module is flowed into, circulation air pump, second solenoid valve is passed through, is finally arranged from gas outlet
Out.
Claims (10)
1. a kind of seismological observation escapes trace hydrogen on-line monitoring system with tomography, it is characterised in that pre-processed including gas collection in situ
Device, the first solenoid valve, second solenoid valve, sampling pump, quantity tube, gas splitter, hydrogen gas detector, vent gas treatment dress
It sets, recycle air pump and governor circuit, the air intake port cover of gas collection pretreatment unit in situ on Observation of fault activity hole, locate in advance by gas collection in situ
Reason device, the first solenoid valve, quantity tube, second solenoid valve and sampling pump are sequentially connected, and the efferent duct of sampling pump connects gas outlet；
First solenoid valve is connected with gas splitter again, gas splitter, hydrogen gas detector, exhaust gas processing device and circulation air pump according to
Secondary to be connected, the efferent duct for recycling air pump is connected with second solenoid valve again；First solenoid valve, second solenoid valve, sampling pump, circulating air
Pump and hydrogen gas detector are connected with governor circuit respectively.
2. seismological observation according to claim 1 escapes trace hydrogen on-line monitoring system with tomography, it is characterised in that institute
The gas collection pretreatment unit in situ stated includes gas collecting apparatus and filter device in situ, and gas collecting apparatus in situ is an inverted funnel type
Cover, cover cover on Observation of fault activity hole, the top connecting adapter of cover, and adapter passes through pipeline and the filter device
It is connected, filter device is connected with first solenoid valve again.
3. seismological observation according to claim 2 escapes trace hydrogen on-line monitoring system with tomography, it is characterised in that institute
The filter device stated includes connected dirt catcher and steam-water separator, and dirt catcher is located at the front end of steam-water separator, i.e. dirt catcher
It is connected by pipeline with the adapter, dirt catcher includes the hydrophobic filter membrane of PTFE, and steam-water separator includes Straight quartz ampoule
With the spiral quartz ampoule and central tube being located in Straight quartz ampoule, Straight quartz ampoule, spiral quartz ampoule and central, tubular at
Three cavitys of steam-water separator, spiral quartz ampoule is by being helically wound around on central tube, the inlet end of spiral quartz ampoule and filter
Dirt device is connected, and the outlet side of central tube is connected with first solenoid valve, and Straight quartz closed frame tube is filled with coolant liquid.
4. seismological observation according to claim 1 or 2 or 3 escapes trace hydrogen on-line monitoring system, feature with tomography
It is that the hydrogen gas detector includes hemispherical shell and the hydrogen sensing element in shell, shell is by plane
Shape bottom surface and the hemisphere mask body covered on bottom surface are tightly connected, and the central point of hemisphere mask body is equipped with inlet channel, into
Gas channel is connected with the gas splitter, and the lower part of hemisphere mask body is equipped with outlet passageway, outlet passageway and the tail
Flash Gas Compression Skid System is connected, and the hydrogen sensing element is located on bottom surface, and hydrogen sensing element is to be plated using magnetically controlled sputter method
The multi-layer nano laminated film of system, including bottom, middle layer and surface layer, bottom are metal copper film layer, and middle layer is hydrogen quick half
Conducting oxide film layer, surface layer are palladium --- transition element alloy firm layer, hydrogen sensing element draw pin, and pin is worn
Bottom surface is crossed to stretch out shell and be connected with the governor circuit.
5. seismological observation according to claim 4 escapes trace hydrogen on-line monitoring system with tomography, it is characterised in that institute
Temperature Humidity Sensor is equipped in the shell stated, Temperature Humidity Sensor is mounted on the hemisphere mask body inner wall of shell, temperature and humidity sensing
The transducing signal of device output is connected with the governor circuit.
6. seismological observation according to claim 1 or 2 or 3 escapes trace hydrogen on-line monitoring system, feature with tomography
It is that the gas splitter is the cylinder of an inner hollow, column body is filled with porous carbon bead, porous carbon bead
Sphere diameter it is all the same.
7. seismological observation according to claim 1 or 2 or 3 escapes trace hydrogen on-line monitoring system, feature with tomography
It is that the exhaust gas processing device is a transparent cylinder, column body has cavity, there is the filtering that can be developed the color Jie in cavity
Matter, filter medium are anhydrous cupric sulfate or discoloration silica gel.
8. seismological observation according to claim 1 or 2 or 3 escapes trace hydrogen on-line monitoring system, feature with tomography
It is that the governor circuit includes microprocessor unit, signal processing unit, data storage cell, display unit, channel radio
It interrogates unit and provides the power supply unit of operating voltage, the transducing signal of the hydrogen gas detector output and institute for governor circuit
The signal processing unit stated is connected, signal processing unit, data storage cell, display unit, wireless communication unit respectively with it is micro-
Processor unit be connected, microprocessor unit respectively with first solenoid valve, second solenoid valve, sampling pump and circulation air pump
It is connected.
9. a kind of seismological observation as described in claim 1 escapes the monitoring method of trace hydrogen on-line monitoring system with tomography,
It is characterized in that gas collection pretreatment unit in situ, the first solenoid valve, quantity tube, second solenoid valve, sampling pump and the outlet
Mouth constitutes acquisition gas circuit, first solenoid valve, gas splitter, hydrogen gas detector, exhaust gas processing device, circulating air
Pump, second solenoid valve and quantity tube constitute closed circulation and detect gas circuit；Acquisition gas circuit work first, tomography emergent gas is through original position
After the acquisition of gas collection pretreatment unit and pretreatment, under the drive of sampling pump, the first solenoid valve, quantity tube, the second electromagnetism are flowed through
Valve and sampling pump are finally flowed out from gas outlet, to determine the volume of sample gas, realize the quantitative collection of sample gas；Then gas circuit is detected
Work provides gas circulation power by circulation air pump, and the sample gas after quantifying is through the first solenoid valve inflow gas splitter, gas point
Go out the hydrogen in sample gas from post separation, hydrogen flows into hydrogen gas detector, the biography of hydrogen gas detector output reflection density of hydrogen
Signal is felt to the governor circuit, and gas flows into vent gas treatment resume module later, finally flows through circulation air pump and flows to second
Solenoid valve.
10. seismological observation according to claim 9 escapes the monitoring method of trace hydrogen on-line monitoring system with tomography,
It is characterized in that being equipped with Temperature Humidity Sensor in the hydrogen gas detector, the transducing signal of Temperature Humidity Sensor output and described
Governor circuit be connected；The monitoring method includes environmental factor modification method：Different warm and humid items are obtained by experiment in advance
Environmental factor under part, then by the letter of the particular curve relationship showed between temperature and humidity and environmental factor write-in governor circuit
In number processing unit；In actual measurement, signal processing unit receives the hydrogen transducing signal and temperature that hydrogen gas detector is sent
Humidity sensor signal is modified actually measured density of hydrogen value using environmental factor, finally obtains and passes through environmental factor
Modified density of hydrogen value.
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| CN108931561B (en) | 2020-12-22 |
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