CN108956922B - Monitor the device of water body methane wear rate - Google Patents
Monitor the device of water body methane wear rate Download PDFInfo
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- CN108956922B CN108956922B CN201810873520.1A CN201810873520A CN108956922B CN 108956922 B CN108956922 B CN 108956922B CN 201810873520 A CN201810873520 A CN 201810873520A CN 108956922 B CN108956922 B CN 108956922B
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Abstract
The invention discloses a kind of devices for monitoring water body methane wear rate, including greenhouse gases analyzer and at least a set of reaction system, connect into circulation loop by air inlet pipe and an air outlet pipe between greenhouse gases analyzer and reaction system；Reaction system includes the cylinder of sealing, is equipped with aeration pump above inner barrel, the exhaust outlet of aeration pump connect air stone by pipeline with air stone and is located at cylinder body bottom；It is additionally provided with fan in cylinder, the power supply line of aeration pump and fan is connected to cylinder external power supply.The device can be monitored the rate of its methane consumption to multiclass water body simultaneously, have the characteristics that easy to operate, stable and high treating effect, operating cost are cheap, can intelligent management, runing time is controllable, ensure that device stable operation and stable monitoring effect.
Description
Technical field
The present invention relates to aquatic monitoring field, especially a kind of device for monitoring water body methane wear rate.
Background technique
It is shown according to the 5th assessment report of IPCC, since the industrial revolution, carbon dioxide, methane in atmosphere, oxidation
Sub- nitrogen isothermal chamber gas emissions significantly increase, and Global Temperature averagely rises 0.85 DEG C.Climate warming is to earth environment and people
Class activity has produced significant impact, and such as glacier volume-diminished, sea level rise.Freshwater ecosystems are carbon dioxide
With the important emission source of methane.However, the atmospheric heating potential due to equivalent methane is higher by more than 20 times than carbon dioxide.Therefore,
The methane wear rate in water body is monitored to accurately assessment aquatic ecosystem to atmosphere CH4The influence of release iron, and adopt
It takes corresponding measure to weaken greenhouse gases release of aquatic ecosystem etc. to be of great significance.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of devices for monitoring water body methane wear rate, can be fast
Fast accurate measurements water body methane wear rate；The apparatus structure is simple, and reliable performance is easy to carry about with one, moreover it is possible to realize intelligent control
System.
The technical solution adopted by the present invention is that the device of monitoring water body methane wear rate, including greenhouse gases analysis
Instrument and at least a set of reaction system, connect into circulation by air inlet pipe and an air outlet pipe between greenhouse gases analyzer and reaction system
Circuit；Reaction system includes the cylinder of sealing, is equipped with aeration pump above inner barrel, exhaust outlet and the air stone of aeration pump pass through
Pipeline connection, air stone are located at cylinder body bottom；It is additionally provided with fan in cylinder, the power supply line of aeration pump and fan is connected to outside cylinder
Portion's power supply.
Further, the reaction system is 2-6 set, and air inlet pipe includes inlet manifold and air intake branch, and escape pipe includes
Outlet general pipeline and going out gas branch pipe；The air inlet of greenhouse gases analyzer is connected with inlet manifold, and gas outlet is connected with outlet general pipeline,
Every set reaction system is designed with air intake branch and going out gas branch pipe, and air intake branch is connected to inlet manifold, and going out gas branch pipe is all connected with
To outlet general pipeline, and solenoid valve is mounted in each air intake branch and going out gas branch pipe, the air intake branch of every set reaction system and
Solenoid valve in going out gas branch pipe connects a timer jointly.
Further, it is connected between the inlet manifold and outlet general pipeline by solenoid valve.
Further, the cylinder lower part is equipped with inlet and outlet pipe lines, is equipped with accurate constant flow pump on inlet and outlet pipe lines.
Further, the aeration pump and fan are respectively connected with timer.
Further, which further includes the seal box that can control temperature, illumination, its outside temperature removing chamber's gas analyzer
He is respectively positioned in seal box component.
Using the method for described device monitoring water body methane wear rate, comprising the following steps:
Into the cylinder of reaction system, injection monitoring water body, is then turned on aeration pump and fan is handled, 10-20min
Stop aeration, is obtained using the concentration of methane in gas in greenhouse gases analyzer monitoring cylinder, then by Henry's law analysis
Water body methane wear rate.
Further, when setting covers reaction system more, Air Exposure and gas-monitoring in reaction system are successively carried out, and are made
With same greenhouse gases analyzer, when in greenhouse gases analyzer without monitoring gas, by its inlet manifold and outlet general pipeline
Connection carries out internal circulation.
The method have the advantages that:
1) present apparatus is treated survey water sample using aeration pump and air stone and is aerated, and micro- gas is covered on the air stone in water body
Hole can make gas fast exchange in water-gas, and by fan the methane in cylinder internal upper part gas be isolated with water body
The methane come quickly mixes to reach aqueous vapor balance；Different moments water body dissolved methane concentration can be monitored on-line, pass through exposure
Gas can make methane concentration in aqueous vapor reach balance rapidly, when avoiding the artificial bring error of conventional method, while shortening experiment
Between.And using the concentration of methane in greenhouse gases analyzer detection gas, can be intended online with computer after observing a period of time
The data in greenhouse gases analyzer are closed, the device for obtaining monitoring water body methane wear rate can be analyzed by Henry's law,
Also it is avoided that the error that the generation of Laboratory Monitoring off-line monitoring is taken back using conventional method.
2) automatic control system can also be arranged in the present apparatus, and solenoid valve is such as mounted in air inlet pipe and an air outlet pipe,
And by solenoid valve connection timer, measurement duration is set by timer, effectively controls opening and closing for solenoid valve, solenoid valve and meter
When device joint can automatically control the minute of water body dissolved methane concentration.Finally, aeration pump and fan are connected with timer,
The aeration duration of automatic control water body may be implemented.By above-mentioned setting, manual operation process is reduced.
3) present apparatus can be monitored the rate of its methane consumption to multiclass water body simultaneously, have easy to operate, operation surely
Fixed and high treating effect, the features such as operating cost is cheap, can intelligent management, runing time is controllable, ensure that the stabilization of device
Operation and stable monitoring effect.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is continuously to supervise methane total amount variation diagram in Time Measurement Unit for the first time.
Fig. 3 is methane total amount variation diagram in second of continuous prison Time Measurement Unit.
Specific embodiment
The present invention is further illustrated below with reference to examples and drawings, but the scope of protection of present invention is not limited to
In the range of embodiment statement.
As shown in Figure 1, monitoring water body methane wear rate device, including greenhouse gases analyzer 1 and at least it is a set of instead
System is answered, circulation loop is connected by air inlet pipe and an air outlet pipe between greenhouse gases analyzer and reaction system；Reaction system
Cylinder 2 including sealing, inner barrel top are equipped with aeration pump 3, and the exhaust outlet of aeration pump is connect with air stone 4 by pipeline,
Air stone 4 is located at cylinder body bottom；It is additionally provided with fan 5 in cylinder, the power supply line of aeration pump and fan is connected to cylinder external power supply.
Aeration pump is by overhead gas in cylinder, and the pipeline being connected by aeration pump with air stone is into bottom water body
Air stone air inlet, air stone is located in water body to be measured, micro- stomata is covered on air stone, gas in water-gas can be made quick
Exchange, and reach balance；The methane for finally by fan methane in cylinder internal upper part gas being separated with water body is fast
Speed mixes to reach aqueous vapor balance.
Preferably, the reaction system is 2-6 set, and air inlet pipe includes inlet manifold 6 and air intake branch 7, and escape pipe includes
Outlet general pipeline 8 and going out gas branch pipe 9；The air inlet of greenhouse gases analyzer is connected with inlet manifold, and it is total that gas outlet is connected with outlet
Pipe, every set reaction system are designed with air intake branch and going out gas branch pipe, and air intake branch is connected to inlet manifold, and going out gas branch pipe connects
It is connected to outlet general pipeline, and is mounted on solenoid valve, the air intake branch of every set reaction system in each air intake branch and going out gas branch pipe
A timer 11 is connected jointly with the solenoid valve 10 in going out gas branch pipe.It is further preferable that reaction system is 4 sets.Solenoid valve can
Effectively to control air inlet and outlet, the gas circuit of solenoid valve is opened when energized, and the gas circuit of solenoid valve is automatically closed when power-off, in conjunction with
After time timing aeration pump and fan are in conjunction with timer, duration can also be aerated with intelligent control.
It is further preferred that the cylinder is organic glass material.Using glass material, sealing effect well can be played
Fruit will not generate interference to gas therein or water body, and convenient for observation inner case.Settable rubber stopper at the top of cylinder
It is sealed, air inlet, gas outlet and pipeline communication port is set on rubber stopper, wherein air inlet is for installing greenhouse gases analysis
The outlet pipe of instrument, gas outlet is used to install the admission line of greenhouse gases analyzer, and pipeline communication port is for placing aeration
The power supply line of pump and fan.Air inlet pipe is analyzed to greenhouse gases analyzer by the intracorporal gas of reaction system cylinder is defeated, is analyzed
Entered in cylinder by escape pipe after the completion.Recycle under test gas in this way to ensure the stabilization of reaction system internal environment.Air inlet
Pipe reserves a certain distance and difference in height in the intracorporal position of cylinder in the intracorporal position of cylinder and escape pipe, to ensure test result
Accuracy.
In addition, the model of solenoid valve can choose that 2W200-20 of section sieve；The model of timer can select KG316T.Greenhouse
The optional model G2301 greenhouse gases analyzer Picarro of gas analyzer, the U.S. or DLT-100 greenhouse gases analyzer
LGR, the U.S..
It will be understood by those skilled in the art that the electronic components such as solenoid valve, timer belong to skill well known to those skilled in the art
Art is not limited to the record of this specification, the connection and control of timer and conventional electrical component to the selection of their models
Relationship belongs to the common knowledge of those skilled in the art, repeats no more in the present specification, and those skilled in the art can be according to existing
Field actual conditions selection known approaches install each element.
Preferably, it is connected between the inlet manifold and outlet general pipeline by solenoid valve；In no monitoring gas, such as still
It needs greenhouse gases analyzer to be run, will be connected between inlet manifold and outlet general pipeline, so that gas is carried out in instrument internal
Circulation, prevents from blocking and damages to instrument.
Preferably, the cylinder lower part is equipped with inlet and outlet pipe lines, is equipped with accurate constant flow pump on inlet and outlet pipe lines.It can also be with
Inlet and outlet are respectively set, and inlet and outlet are passed through into pipeline respectively and connect accurate constant flow pump, more accurately
The intracorporal water level of application cylinder.
Preferably, the aeration pump and fan are respectively connected with timer, and the automatic control of aeration time may be implemented.
Preferably, which further includes the seal box that can control temperature, illumination, other outside temperature removing chamber's gas analyzer
Component is respectively positioned in seal box.Constant temperature mode can be set in seal box, shading treatment or supplementary light can also be carried out, it can
To be compared simultaneously using methane concentration of ordinary dissolution of multiple reaction systems to water bodys different at identical temperature.Screening can also be passed through
Light processing is to water body whether the methane concentration of ordinary dissolution under illumination condition compares.
Using the method for described device monitoring water body methane wear rate, comprising the following steps:
Into the cylinder of reaction system, injection monitoring water body, is then turned on aeration pump and fan is handled, 10-20min
Stop aeration, is obtained using the concentration of methane in gas in greenhouse gases analyzer monitoring cylinder, then by Henry's law analysis
Water body methane wear rate.
Preferably, when setting covers reaction system more, Air Exposure and gas-monitoring in reaction system are successively carried out, and are used
Same greenhouse gases analyzer connects its inlet manifold and outlet general pipeline when in greenhouse gases analyzer without monitoring gas
It is logical, carry out internal circulation.
When 4 sets of reaction systems are arranged such as apparatus of the present invention, structure chart is as shown in Figure 1.
Specific operation process is as follows, and the timer of first reaction system is opened using timer setting 9:00-9:15,
Aeration pump is controlled, water body is aerated by air stone, timer is concurrently set and opens fan, set 9:15-9:25 timing
Device opens two solenoid valves of control gas analyzer disengaging gas, the two solenoid valves are controlled with a timer, greenhouse gases
Analyzer monitors the concentration of methane gas of first set reaction system at this time, collects data.9:15-9:30 opens second set of reaction
The aeration pump of system is aerated, and the solenoid valve of first set reaction system control disengaging gas has closed when 9:30 after aeration
It closing, setting 9:30-9:40 opens two solenoid valves of disengaging gas of control second set of reaction system of gas analyzer, and so on,
Sequence is monitored the methane concentration of other a few set reaction systems, can every 3 hours companies in order to obtain accurate methane wear rate
Continuous monitoring, which repeats to test primary data of collecting, to be analyzed, and can analyze to consume in water-outlet body the speed of methane by Henry's law
Rate.In this device using upper, we can monitor the water body methane wear rates in more set reaction systems simultaneously, can also lead to
The impact factor of control differential responses system is crossed to carry out check experiment, as first set and second set of reaction system carry out at shading
Reason, third set and the 4th set of reaction system carry out lighting process or four sets of reaction systems use different water bodys；It can also incite somebody to action
Four sets of reaction systems are handled with same way, are compared to result accuracy.
Pass through each device of injection of water inlet siphon successively equivalent after the Surface water sample for being derived from pond being shaken up when experiment
In (transparent organic glass cylinder, internal diameter 22cm, height 30cm) (height for accounting for about one third), all connect then is sealed
Mouthful.When observing gas concentration in certain device, the power supply of air pump and fan in the device is connected by automatic control system, is cut simultaneously
It changes DLT-100 greenhouse gases analyzer to be connected with its gas circuit, CH in measurement pipe headspace gas4Concentration, observe 15 points
(i.e. pipe inner top air CH after clock4With the CH dissolved in water body4Basically reach balance) it is switched to next device.So circulation.Often
3 hours circulation primaries.DLT-100 greenhouse gases analyzer power supply is always in an ON state during all experimentss.According to henry
Sharp law, the amount of dissolved gas is directly proportional to gaseous phase partial pressure in solution；The CH above device4It is dense that partial pressure is higher than water body dissolved methane
When spending, air pump blasts the overhead gas in reactor in water, and portion of methane can be absorbed by water body.Conversely, the methane in water body
It can be come out with the bubble back-diffusion that air pump generates.In this way, the gas in water constantly exists with the gas in device (reactor)
It swaps, so that the concentration of methane in device be made to be in dynamic change state.
The present apparatus is by the CH in observation system used in experiment with computing4Gross mass changes with time to estimate water
CH in body4Wear rate.Methane total amount includes with part existing for gas phase state and the part being dissolved in water sample, Qian Zheyou
The CH of pipe headspace after the water of LGR measurement-gas balance4Concentration (Cg) is directly calculated multiplied by the gas volume of observation system
It obtains, the latter is then calculated according to Henry's law.
According to Henry's law: Hcc=Ca/Cg
Hcc=HcpR T
H in formulaccFor dimensionless Henry solubility；HcpFor Henry solubility (unit: mol/m3/Pa)；T is temperature (K)；R
For gas constant (8.314J/mol/K；For Ca aqueous-phase concentration (μm ol/L)；Cg is gas phase concentration (μm ol/L).
The H chosen during present apparatus experimental calculationcpIt is 1.4 × 10-5mol/m3/Pa。
Choosing calorstat temperature in this experiment is 15 degrees Celsius, the initial methane total amount of injection or various concentration in two devices
Water body, after continuously monitoring, the data that wherein device one is measured according to LGR after treatment, obtain 1 data of table, according to
In acquired continuous time in device methane molal weight variation, carry out exponential fitting obtain Fig. 2.Wherein T-CH4According to
Methane total amount in the device of detection.Sometime the variation of methane total amount is methane wear rate in water body, device in section apparatus
One water body methane wear rate is 0.0265 μm of ol/min.
Methane total amount changes in table 1 first time continuous monitoring device
Device two after treatment according to the data of LGR measurement, obtains 2 data of table, according to acquired after continuous monitoring
In continuous time in device methane molal weight variation, carry out exponential fitting and obtain Fig. 3, the water body methane of device two consumes speed
Rate is 0.0453 μm of ol/min.
| Time/min | T-CH4/μmol | Time/min | T-CH4/μmol | Time/min | T-CH4/μmol |
| 0.000 | 124.370 | 899.845 | 46.359 | 1800.031 | 19.306 |
| 179.951 | 100.588 | 1079.784 | 38.847 | 1979.989 | 16.303 |
| 360.020 | 82.920 | 1259.725 | 32.457 | 2159.946 | 13.718 |
| 539.963 | 67.887 | 1440.005 | 27.237 | 2339.904 | 11.692 |
| 719.901 | 56.461 | 1619.961 | 23.011 | 2519.864 | 10.125 |
Methane total amount changes in second of the continuous monitoring device of table 2
This observation shows in experimentation that the methane content in device is presented index pattern and reduces, although in experimental provision
Setting initial methane total amount or concentration it is inconsistent, but two device monitorings with calculating after obtained methane wear rate in phase
It is very close under synthermal and dark conditions, matched curve also very close to.The result shows that this experimental provision is for monitoring
In water body methane wear rate it is relatively simple with it is quick.
Claims (7)
1. monitoring the device of water body methane wear rate, it is characterised in that: including greenhouse gases analyzer and at least a set of reaction
System connects into circulation loop by air inlet pipe and an air outlet pipe between greenhouse gases analyzer and reaction system；Reaction system packet
The cylinder of sealing is included, is equipped with aeration pump above inner barrel, the exhaust outlet of aeration pump is connect with air stone by pipeline, air stone
Positioned at cylinder body bottom；It is additionally provided with fan in cylinder, the power supply line of aeration pump and fan is connected to cylinder external power supply；The reaction
System is 2-6 set, and air inlet pipe includes inlet manifold and air intake branch, and escape pipe includes outlet general pipeline and going out gas branch pipe；Greenhouse gas
The air inlet of body analyzer is connected with inlet manifold, and gas outlet is connected with outlet general pipeline, and every set reaction system is designed with air inlet branch
Pipe and going out gas branch pipe, air intake branch are connected to inlet manifold, and going out gas branch pipe is connected to outlet general pipeline, and each air intake branch
With solenoid valve is mounted in going out gas branch pipe, the solenoid valve on the air intake branch and going out gas branch pipe of every set reaction system connects jointly
One timer.
2. the apparatus according to claim 1, it is characterised in that: pass through solenoid valve between the inlet manifold and outlet general pipeline
Connection.
3. the apparatus according to claim 1, it is characterised in that: the cylinder lower part is equipped with inlet and outlet pipe lines, inlet and outlet pipes
Accurate constant flow pump is installed on road.
4. the apparatus according to claim 1, it is characterised in that: the aeration pump and fan are respectively connected with timer.
5. device according to any one of claims 1-4, it is characterised in that: the device further include can control temperature,
The seal box of illumination, the other component outside temperature removing chamber's gas analyzer are respectively positioned in seal box.
6. using the method for claim 5 described device monitoring water body methane wear rate, which is characterized in that including following step
It is rapid:
Into the cylinder of reaction system, injection monitoring water body, is then turned on aeration pump and fan is handled, and 10-20min stops
Aeration analyzes to obtain water-outlet body using the concentration of methane in gas in greenhouse gases analyzer monitoring cylinder, then by Henry's law
Methane wear rate.
7. according to the method described in claim 6, it is characterized by: aeration when the more set reaction system of setting, in reaction system
Processing and gas-monitoring successively carry out, using same greenhouse gases analyzer, when monitoring gas no in greenhouse gases analyzer
When, its inlet manifold is connected to outlet general pipeline, carries out internal circulation.
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| CN103321616A (en) * | 2013-07-06 | 2013-09-25 | 李贤明 | Method and system for collecting seabed methane hydrate |
| CN105137020A (en) * | 2015-08-20 | 2015-12-09 | 四川大学 | Method for promoting release of supersaturated total dissolved gas by using aeration and experimental device thereof |
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