CN111474019A - Soil gas layered sampler and sampling well-flushing method - Google Patents
Soil gas layered sampler and sampling well-flushing method Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 277
- 239000002680 soil gas Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000011010 flushing procedure Methods 0.000 title claims description 12
- 239000007789 gas Substances 0.000 claims abstract description 146
- 230000007246 mechanism Effects 0.000 claims abstract description 118
- 239000000523 sample Substances 0.000 claims abstract description 107
- 238000001914 filtration Methods 0.000 claims abstract description 51
- 238000005406 washing Methods 0.000 claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 10
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 74
- 238000007789 sealing Methods 0.000 claims description 51
- 229920001971 elastomer Polymers 0.000 claims description 15
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 239000000428 dust Substances 0.000 claims description 5
- 229920002943 EPDM rubber Polymers 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 239000012982 microporous membrane Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- RFFFKMOABOFIDF-UHFFFAOYSA-N Pentanenitrile Chemical compound CCCCC#N RFFFKMOABOFIDF-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims 1
- 238000004868 gas analysis Methods 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
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Abstract
The invention provides a soil gas layered sampler and a sampling well washing method, which comprises a sampling mechanism, a sampling probe, a plurality of connecting mechanisms and two times of extension rods, wherein the extension rods are used for sampling soil in a layered mode and determining the optimal sampling time, the well washing mechanism is used for injecting well washing media from a sampling device and carrying the media in a shaft to the ground so as to change the property of the media in the shaft and meet the operation requirement, a filter mechanism is arranged on one side inside the sampling mechanism and used for filtering the media obtained by sampling and conveying the filtered media to an analyzer for analysis and treatment, a media conveying hose is arranged between the sampling mechanism and the filter mechanism and used for conveying the obtained media, and the soil gas layered sampler can be used for rapidly detecting the concentration of various gases in soil in a layered mode, and the gas can be dewatered and dedusted, so that the subsequent analysis of the sampled gas is facilitated.
Description
Technical Field
The invention relates to the technical field of soil quality evaluation, in particular to a soil gas layered sampler and a sampling and well washing method.
Background
Today, soil gas analysis is mainly used to assess contaminated sites and remediation of contaminated sites. On the one hand, it is used for pre-identification and preliminary investigations to determine the pollution focus. On the other hand, the soil gas monitoring is carried out during the implementation of the remediation measures, and finally after the remediation measures are completed, the final inspection can also be carried out through soil gas analysis, the other important point of the soil gas analysis is to control the landfill area, the traditional soil gas sampling method is very simple, and only one hose is put into the sampling well.
The traditional sampling instrument cannot determine the optimal sampling time of the point when the VOC is collected, the data distortion is serious, the real soil condition cannot be truly reflected, and the repeatability is poor; the sampling flow can not be adjusted according to the actual monitoring well, and the water and dust removal treatment can not be carried out on the sampled gas, so that the conventional soil gas sampler is economical in price but far from meeting the current investigation and evaluation of the polluted site.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a soil gas layered sampler and a sampling well-flushing method, and the invention adopts the following technical scheme for achieving the purpose:
a soil gas stratified sampler comprises
The sampling mechanism consists of a sampling main body, a sampling probe rod, a sampling probe, a plurality of connecting mechanisms and two times of extension rods of which the number is twice that of the connecting mechanisms, and is used for carrying out layered sampling on soil and determining the optimal sampling time;
the well washing mechanism is used for injecting a well washing medium into the well washing mechanism through the sampling device and carrying the medium in the shaft to the ground, so that the property of the medium in the shaft is changed to meet the process of operation requirements;
the filtering mechanism is arranged on one side in the sampling main body and is used for filtering the sampled and obtained medium and conveying the filtered medium into an analyzer for analysis;
a media transfer hose disposed between the sampling mechanism and the filter mechanism for transferring the captured media.
Preferably, the outer end surface of the sampling main body is respectively provided with a first right-angle elbow, a second right-angle elbow, a third right-angle elbow, a fourth right-angle elbow and a fifth right-angle elbow, one end of a first medium transmission hose is communicated with a sampling probe rod positioned at the bottom of the sampling main body, the other end of the first medium transmission hose is communicated with one end of the first right-angle elbow positioned at one side of the outer part of the sampling main body, the other end of the first right-angle elbow is communicated with one end of the second right-angle elbow through a second medium transmission hose, one side of the inner part of the sampling main body is provided with a second thin right-angle elbow corresponding to the second right-angle elbow, one end of the second thin right-angle elbow is pressed into the second right-angle elbow, the other end of the second thin right-angle elbow is pressed into the air inlet end of the filtering mechanism, one side of the third right-, a panel type adjustable gas flowmeter is arranged on one side, far away from the second right-angle thin elbow, in the sampling main body, one end of a third medium transmission hose is communicated with the third right-angle elbow, the other end of the third medium transmission hose is communicated with the gas inlet end of the panel type adjustable gas flowmeter, one end of a fourth medium transmission hose is communicated with the gas outlet end of the panel type adjustable gas flowmeter, the other end of the fourth medium transmission hose is communicated with a fourth right-angle elbow positioned on one side outside the sampling main body, one end of a fifth medium transmission hose is communicated with one end of the fourth right-angle elbow, the other end of the fifth medium transmission hose is communicated with a fifth right-angle elbow positioned on one side outside the sampling main body, one end of a sixth medium transmission hose is communicated with the fifth right-angle elbow, and the other end of the sixth medium transmission hose is provided with a quick-insertion port, the quick-plugging port is connected with a gas analyzer, a sampling pump for providing power for the sampler is arranged in the gas analyzer, and a switch for controlling the sampling pump is arranged on the outer end face of the gas analyzer.
Preferably, the first right-angle elbow, the second right-angle elbow, the third right-angle elbow, the fourth right-angle elbow and the fifth right-angle elbow are all hinge type right-angle elbows, and the second right-angle thin elbow is a PP right-angle elbow with the same inner diameter size as the second right-angle elbow.
Preferably, the sampling probe that sets up in sampling main part bottom is cavity form tubular structure sampling device terminal surface is equipped with the head that sets up in probe one side, sampling device with the sampling probe is the slant intercommunication form, sampling device is used for injecting the well-flushing medium into sampling well/downthehole portion through the sampling probe, wherein, sampling device joinable embeds VOC adsorbs the rubber chock plug of pipe box or disposable syringe.
Preferably, a sealed vertebra is connected to sampling probe rod bottom, sealed vertebra bottom is provided with the extension rod, wherein, arbitrary two be provided with a coupling mechanism between the extension rod for with two extension rod intercommunications, singly extension rod length is 1 meter coupling mechanism outside is provided with a sealing washer for seal extension rod and coupling mechanism's joint line, the sealing washer material is any one of them of silicon rubber, butyl cyanide rubber, ethylene propylene diene monomer rubber.
Preferably, the bottom end of the extension rod is communicated with a sampling probe through the connecting mechanism, a sealing ring is arranged outside the connecting mechanism and the extension rod and used for sealing a connecting gap between the extension rod and the sampling probe, the bottom of the sampling probe is in an inverted cone shape, the diameter of the middle part of the sampling probe is smaller than the diameter of the two end parts of the sampling probe, and small holes which are uniformly distributed are formed in the outer surface of the middle part of the sampling probe.
Preferably, the panel-type adjustable gas flow meter controls the flow at 80L/h.
Preferably, filtering mechanism comprises linear filter, gasket and round hole filter from last to down in proper order, the gasket can be passed through for the gas, sets up linear filter with the centre of round hole filter for increase area of contact between them, filtering mechanism's the end internal surface of giving vent to anger be equipped with third elbow bend assorted screw thread, filtering mechanism's the end of giving vent to anger with third elbow bend carries out threaded connection, and the medium that obtains loops through linear filter with the round hole filter carries out filtering operation.
Preferably, the round hole filter in the filtering mechanism is a polytetrafluoroethylene microporous membrane filter with the pore size of 0.2 μm.
A sampling method of a soil gas stratified sampler comprises the following steps:
s1, a sampling mechanism is installed, the length of a single extension rod is 1 meter, the number of the extension rods is determined according to the sampling depth requirement, the extension rods are communicated with a connecting mechanism, a sampling probe is connected to the bottom of the extension rods through the connecting mechanism, a sealing ring is arranged outside the connecting mechanism, the top of each extension rod is inserted into a sealing cone of which the inner diameter size is matched with the outer diameter size of each extension rod, the sampling probe is inserted into a specified position to be detected, the lower end face of each sealing cone is located under the ground, the upper end face of each sealing cone is located on the ground, the sampling probe connected with a sampling main body is communicated with the top of each extension rod through the sealing cones, and a quick-insertion port is connected into an analyzer.
S2, sampling, turning on a switch for controlling a sampling pump, pressing a gas medium at a designated point in soil into the sampling probe through small holes uniformly distributed on the outer surface of the middle part of the sampling probe, enabling the gas medium to enter a first medium transmission hose which is positioned in the sampling main body and communicated with the sampling probe through an extension rod and the sampling probe, enabling the gas medium to enter a first right-angle elbow which is communicated with the first medium transmission hose and positioned on one side outside the sampling main body, enabling the gas medium to enter a second right-angle elbow which is positioned on one side outside the sampling main body through a second medium transmission hose communicated with the first right-angle elbow, and enabling the gas medium to enter an air inlet end of a filtering mechanism through a second right-angle thin elbow which is communicated with the second right-angle elbow and positioned on one side inside the sampling.
S3, removing water and dust from the sampled gas, enabling the sampled medium to pass through a circular hole filter at the bottom of the filtering mechanism through the air inlet end of the filtering mechanism, enabling the medium with the diameter larger than the aperture of the circular hole in the gas medium to be incapable of passing through the circular hole filter, enabling the medium with the diameter smaller than the aperture of the circular hole filter in the gas medium to enter the linear filter through a gasket which can enable the gas to pass through and is located between the circular hole filter and the linear filter, and removing water and impurities in the gas medium.
S4, adjusting the flow of the gas medium, enabling the gas medium without water and impurities to enter a third elbow bend which is communicated with the gas outlet end of the filtering mechanism and is positioned on one side of the upper end face of the filtering mechanism through the gas outlet end of the filtering mechanism, enabling the gas medium to enter the gas inlet end of the panel type adjustable gas flowmeter through a third medium transmission hose connected with the third elbow bend, controlling the flow rate of the gas medium to be 80L/h through adjusting the gas flowmeter, enabling the gas medium with the flow rate adjusted to enter a fourth medium transmission hose communicated with the gas outlet end of the panel type adjustable gas flowmeter through the gas outlet end of the panel type adjustable gas flowmeter, enabling the gas medium to enter a fifth medium transmission hose through a fourth elbow bend which is communicated with the fourth transmission hose and is positioned on one side of the outer portion of the sampling main body, enabling the gas medium to enter a fifth elbow bend which is communicated with the fifth medium transmission hose and is provided with a sixth medium transmission hose, and enabling the sampled gas medium to be connected with the analyzer through a fast plug port at the tail end of the sixth medium hose.
And S5, after sampling is finished, closing a switch for controlling the sampling pump, disconnecting the quick-plugging port from the analyzer, disconnecting the sampling probe rod from the extension rod, and pulling the extension rod and the sampling probe out of the designated detection point.
A well washing method of a soil gas stratified sampler is applied to the well washing method of the sampler and comprises the following steps:
s1, installation well washing mechanism, single extension rod length is 1 meter, confirms the quantity of extension rod according to the sampling degree of depth requirement, with extension rod and coupling mechanism intercommunication, the sampling probe passes through coupling mechanism and connects in the bottom of extension rod the coupling mechanism outside sets up the sealing washer, inserts the sealed awl of internal diameter and extension rod' S external diameter assorted with the top of extension rod, inserts appointed position of awaiting measuring with the sampling probe, makes sealed awl lower terminal surface be located subaerial, and sealed awl up end is located subaerial, will even have the sampling probe of sampling main part to pass through sealed awl and extension rod top intercommunication, will be located sampling probe one side the sampling device terminal surface sets up and is used for disposable syringe male rubber stopper.
And S2, washing the well, inserting the sampling device into the shaft, sucking the well washing medium into the disposable injector, and injecting the well washing medium into the shaft through the rubber plug.
And S3, completing well washing, disconnecting the sampling probe rod and the extension rod, and pulling the extension rod and the sampling probe out of the designated detection point.
Compared with the prior art, the invention has the beneficial effects that:
① the invention can realize layered sampling by arranging an extension rod and a connecting mechanism, and the sampling depth is not limited by the length of the instrument of the invention.
② the invention can inject the well-flushing medium from the sampling device by setting the sampling device, and carry the medium in the shaft to the ground by the sampling device, thereby changing the medium property in the shaft to meet the requirements of well-flushing operation.
③ the sampling device can be arranged into a suction tube sleeve with a suction tube inside or a rubber plug capable of being inserted into a disposable syringe through the seal head of the sampling device, and the sampling can be realized in a gathering type (suction tube) and a non-gathering type (headspace bottle).
④ compared with the prior art, the invention has the advantages of simple operation, multiple functions, easily obtained raw materials, low cost, and easy operation by only one person, and is very suitable for popularization and application.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a front view of a sampler as disclosed herein;
FIG. 2 is a top view of the disclosed sampler;
FIG. 3 is an enlarged view of a portion of the disclosed sampler filter mechanism;
FIG. 4 is a flow chart of the sampler sampling disclosed in the present invention;
FIG. 5 is a flow chart of a sampler well wash disclosed herein;
reference numerals: 1-a sampling main body, 2-a sampling probe rod, 3-a first medium transmission hose, 4-a first right-angle elbow, 5-a panel type adjustable gas flowmeter, 6-a sixth medium transmission hose, 7-a second right-angle elbow, 8-a second medium transmission hose, 9-a fourth medium transmission hose, 10-a fifth right-angle elbow, 11-an end enclosure, 12-a linear filter, 13-a gasket, 14-a round hole filter, 15-a filtering mechanism, 16-a quick connector, 17-a second right-angle thin elbow, 18-an analyzer, 19-a sampling probe, 20-a connecting mechanism, 21-an extension rod, 22-a sealing cone, 23-a sampling device, 24-a sampling pump, 25-a sealing ring, 26-a fifth medium transmission hose, 27-a fourth right-angle elbow, 28-a hole, 29-a third right-angle elbow, 30-a third medium transmission hose, 31-a panel type adjustable gas flowmeter gas outlet end and 32-a panel type adjustable gas flowmeter gas inlet end.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 3, the soil gas stratified sampling apparatus of the present embodiment includes a sampling mechanism, which is composed of a sampling main body 1, a sampling probe rod 2, a sampling probe 19, a plurality of connection mechanisms 20, and two times of extension rods 21 in the connection mechanisms 20, and is used for stratified sampling of soil and determination of optimal sampling time;
the well washing mechanism is used for injecting well washing media from the sampling device 23 and carrying the media in the shaft to the ground, so that the property of the media in the shaft is changed to meet the process of operation requirements;
the filtering mechanism 15 is arranged on one side inside the sampling main body 1 and is used for filtering the sampled medium and conveying the filtered medium into the analyzer 18 for analysis;
a media transfer hose disposed between the sampling mechanism and the filtering mechanism 15 for transferring the captured media.
Preferably, the outer end face of the sampling main body 1 is hinged with a first right-angle elbow 4, a second right-angle elbow 7, a third right-angle elbow 29, a fourth right-angle elbow 27 and a fifth right-angle elbow 10, one end of a first medium transmission hose 3 is connected with the sampling probe rod 2 at the bottom of the sampling main body 1 by a ferrule, the other end of the first medium transmission hose 3 is connected with one end of the first right-angle elbow 4 at one side of the outer part of the sampling main body 1 by a ferrule, the other end of the first right-angle elbow 4 is connected with one end of the second right-angle elbow 7 by a second medium transmission hose 8 by a ferrule, one side of the inner part of the sampling main body 1 is provided with a second right-angle thin elbow 17 corresponding to the second right-angle elbow 7, one end of the second right-angle thin elbow 17 is pressed into the second right-angle elbow 7, and the other end of the second right-angle thin elbow 17 is pressed into the, the third elbow bend 29 is positioned on the upper end surface of the filtering mechanism 15 and communicated with the gas outlet end of the filtering mechanism 15, a panel type adjustable gas flowmeter 5 is arranged on one side of the sampling main body 1 far away from the second thin elbow bend 17, the gas flow rate can be controlled according to the sampling requirement through the panel type adjustable gas flowmeter 5, the gas pressure is controlled through controlling the gas flow rate, one end of a third medium transmission hose 30 is connected with the third elbow bend 29 by a clamping sleeve, the other end of the third medium transmission hose is connected with the gas inlet end 32 of the panel type adjustable gas flowmeter by a clamping sleeve, one end of a fourth medium transmission hose 9 is connected with the gas outlet end 31 of the panel type adjustable gas flowmeter by a clamping sleeve, the other end of the fourth medium transmission hose 9 is connected with a fourth elbow bend 27 positioned on one side of the outer part of the sampling main body 1 by a clamping sleeve, one end of a fifth medium transmission hose 26 is connected with one end of the fourth elbow 27 by a clamping sleeve, the other end of the fifth medium transmission hose 26 is communicated with a fifth elbow 10 positioned on one side outside the sampling main body, one end of a sixth medium transmission hose 6 is communicated with the fifth elbow 10, the other end of the sixth medium transmission hose 6 is provided with a quick-plugging port 16, the quick-plugging port 16 is connected with a gas analyzer 18 and can also be connected with other portable analyzers, a sampling pump 24 for providing power for the sampler is arranged in the gas analyzer 18, and a switch for controlling the sampling pump 24 is arranged on the outer end face of the analyzer 18.
Preferably, the first elbow bend 4, the second elbow bend 7, the third elbow bend 29, the fourth elbow bend 27 and the fifth elbow bend 10 are all hinge-type elbow bends, and the second elbow bend 7 is a PP elbow bend with the same inner diameter size as the second thin elbow bend 17.
Preferably, the sampling probe rod 2 which is arranged at the bottom end of the sampling main body 1 and connected with the first medium conveying hose 3 by a clamping sleeve is of a hollow tubular structure, a sampling device 23 is welded on one side of the sampling probe rod 2 in a hard welding way, the sampling device 23 is obliquely communicated with the upper end of the sampling probe rod 2 at an angle of 45 degrees, the end part of the sampling device 23 is provided with a seal head 11, the seal head 11 is used for sealing the sampling device 23, the sampling device 23 is used for injecting well-flushing medium into the interior of the sampling well/hole through the sampling probe 2, wherein, the sampling device 23 can be connected with a built-in VOC adsorption pipe sleeve or a rubber plug of a disposable syringe, by arranging the sampling device 23, a well flushing medium can be injected from the sampling device 23, and the medium in the shaft is carried to the ground through the sampling device 23, so that the property of the medium in the shaft is changed to meet the requirements of well flushing operation. The device can also be used for measuring the voc concentration at different times and different depths, and the measurement data is recorded into an analyzer to determine the optimal sampling time of the voc.
Preferably, the bottom of the sampling probe rod 2 is connected with a sealing cone 22, the sealing cone 22 can prevent air in the air from entering the sampler, the bottom of the sealing cone 22 is connected with an extension rod 21, wherein, a connecting mechanism 20 is arranged between any two extension rods 21 and is used for communicating the two extension rods 21, the connecting mechanism 20 is in threaded connection with the extension rod 21, the length of each extension rod 21 is 1 m, a sealing ring 25 is arranged outside the connecting mechanism 20 for sealing the connecting gap between the extension rod 21 and the connecting mechanism 20, the sealing ring is made of any one of silicon rubber, butyl rubber, butadiene-acrylonitrile rubber and ethylene propylene diene monomer rubber, by arranging the extension rod 21 and the connecting mechanism 20, layered sampling can be realized, and the sampling depth is prevented from being limited by the length of the instrument.
Preferably, the bottom end of the extension rod 21 is communicated with a sampling probe 19 through a connecting mechanism 20, the connecting mechanism 20 is in threaded connection with the sampling probe 19, a sealing ring 25 is arranged outside the connecting mechanism 20 and the sampling probe 19 and used for sealing a connecting gap between the extension rod 21 and the sampling probe 19, by arranging the sealing ring 25, a gas medium outside a point to be measured in a sampling well/hole can be prevented from entering the extension rod 21, the bottom of the sampling probe is in an inverted cone shape, the diameter of the middle part of the sampling probe 19 is smaller than the diameters of the two end parts of the sampling probe 19, and small holes 28 which are uniformly distributed are formed in the outer surface of the middle part of the sampling probe 19.
Preferably, the panel-type adjustable gas flow meter 5 controls the flow rate at 80L/h, and the gas pressure is controlled by controlling the gas flow into the sampling body 1.
Preferably, filtering mechanism 15 comprises linear filter 12, gasket 13 and round hole filter 14 from top to bottom in proper order, round hole filter 14 is the polytetrafluoroethylene microporous membrane filter that the aperture is 0.2 μm, gasket 13 can pass through for the gas, sets up linear filter 12 with the centre of round hole filter 14 for increase area of contact between them, filtering mechanism 15 give vent to anger the end internal surface be equipped with third quarter bend 29 assorted screw thread, filtering mechanism 15 give vent to anger the end with third quarter bend 29 carries out threaded connection, the gaseous medium that obtains loops through linear filter 12 removes dust and round hole filter 14 carries out the dewatering operation.
As another scheme of the invention, the invention also provides a sampling method of the soil gas stratified sampler, which comprises the following steps:
s1, installing a sampling mechanism, wherein the length of a single extension rod 21 is 1 m, determining the number of the extension rods 21 according to the sampling depth requirement, connecting the extension rods 21 with the connecting mechanism 20 through threads, connecting the sampling probe 19 with the extension rods 21 through the connecting mechanism 20 through threads, positioning the sampling probe 19 at the bottom of the extension rods 21, a sealing ring 25 is arranged outside the connecting mechanism 20, the top of the extension rod 21 is inserted into a sealing cone 22 with the inner diameter matched with the outer diameter of the extension rod, the sampling probe 19 is inserted into a specified position to be measured, the lower end surface of the sealing cone 22 is positioned under the ground, the upper end face of the sealing cone 22 is located on the ground, so that gas in the air is prevented from entering the sampling probe rod 2, the sampling probe rod 2 connected with the sampling main body 1 is communicated with the top of the extension rod 21 through the sealing cone 22, and the quick-plugging port 16 is connected into the analyzer 18.
S2, sampling, turning on a switch for controlling a sampling pump 24, pressing a gas medium at a designated point in soil into the sampling probe 19 through small holes 28 uniformly distributed on the outer surface of the middle part of the sampling probe 19, allowing the gas medium to enter a first medium transmission hose 3 which is positioned inside the sampling main body 1 and connected with the sampling probe 2 by a clamping sleeve through an extension rod 21 and the sampling probe 2, allowing the gas medium to enter a first right-angle elbow 4 which is connected with the first medium transmission hose 3 by the clamping sleeve and positioned on one side of the outside of the sampling main body 1, allowing the gas medium to enter a second right-angle elbow 7 positioned on one side of the outside of the sampling main body 1 through a second medium transmission hose 8 which is connected with the first right-angle elbow 4 by the clamping sleeve, and allowing the gas medium to enter the air inlet end of a filter mechanism 15 through a second right-angle thin elbow 17 which is positioned on one side of the inside.
S3, removing water and dust from the sampled gas, enabling the sampled medium to pass through the circular hole filter 14 at the bottom of the filtering mechanism 15 through the air inlet end of the filtering mechanism 15, enabling the medium with the diameter larger than the aperture of the circular hole in the gas medium to not pass through the circular hole filter 14, enabling the medium with the diameter smaller than the aperture of the circular hole filter 14 in the gas medium to enter the linear filter 12 through the gasket 13 located between the circular hole filter 14 and the linear filter 12 for filtering again, and removing moisture and impurities in the gas medium.
S4, adjusting the flow of the gas medium, enabling the gas medium without water and impurities to enter a third elbow bend 29 which is communicated with the gas outlet end of the filtering mechanism 15 and is positioned on one side of the upper end face of the filtering mechanism 15 through the gas outlet end of the filtering mechanism 15, enabling the gas medium to enter a gas inlet end 32 of a panel type adjustable gas flowmeter through a third medium transmission hose 30 connected with the third elbow bend 29, adjusting the gas flowmeter 5, controlling the flow rate of the gas medium at 80L/h, enabling the gas medium with the adjusted flow rate to enter a fourth medium transmission hose 9 communicated with the gas outlet end 31 of the panel type adjustable gas flowmeter through the gas outlet end 31 of the panel type adjustable gas flowmeter, enabling the gas medium to enter a fifth medium transmission hose 26 through a fourth elbow bend 27 which is communicated with the fourth medium transmission hose 9 and is positioned on one side of the outer portion of the sampling main body 1, enabling the gas medium to enter a sixth medium transmission hose 6 which is connected with the fifth medium transmission hose 10 and is connected with the fifth medium transmission hose 26 and is connected with a quick sampling instrument 18 through a tail end plug 16 of the sixth medium transmission hose 6.
And S5, after the sampling is finished, closing a switch for controlling the sampling pump 24, disconnecting the quick-connection interface 16 from the analyzer 18, disconnecting the sampling probe rod 2 from the extension rod 21, and pulling the extension rod 21 and the sampling probe 19 out of the designated detection point.
As another scheme of the invention, the invention also provides a well washing method of the soil gas stratified sampler, which comprises the following steps:
s1, installing a well washing mechanism, wherein the length of a single extension rod 21 is 1 m, determining the number of the extension rods 21 according to the sampling depth requirement, connecting the extension rods 21 with the connecting mechanism 20 through threads, connecting the sampling probe 19 with the extension rods 21 through the connecting mechanism 20 through threads, positioning the sampling probe 19 at the bottom of the extension rods 21, a sealing ring 25 is arranged outside the connecting mechanism 20, the top of the extension rod 21 is inserted into a sealing cone 22 with the inner diameter matched with the outer diameter of the extension rod, the sampling probe 19 is inserted into a specified position to be measured, the lower end surface of the sealing cone 22 is positioned under the ground, the sealing cone 22 upper end face is located subaerial, avoids the gas in the air to get into sampling probe rod 2, will even have the sampling probe rod 2 of sampling main part 1 to communicate through sealing cone 22 and extension rod 21 top, will be located sampling probe rod 2 one side 23 terminal surface setting of sampling device is used for disposable syringe male rubber stopper.
And S2, washing the well, inserting the sampling device into the shaft, sucking the well washing medium into the disposable injector, and injecting the well washing medium into the shaft through the rubber plug head for well washing.
And S3, completing well washing, disconnecting the sampling probe rod 2 from the extension rod 21, and pulling the extension rod 21 and the sampling probe 19 out of the designated detection point.
The working principle of the invention is as follows: when sampling, the number of the extension rods 21 is determined according to the depth of a sampling point from the ground, different numbers of extension rods 21 are connected to meet the requirements of sampling points at different depths of a sampler, after the number of the extension rods 21 is determined, the extension rods 21 are communicated with the extension rods 21 through the connecting mechanism 20, the sampling probe 19 is communicated with the extension rods 21 through the connecting mechanism 20, sealing rings 25 are respectively arranged at a connecting gap between the sampling probe 19 and the connecting mechanism 20 and at a connecting gap between the extension rods 21 and the connecting mechanism 20 to prevent gas except the sampling points in a sampling well/hole from entering the extension rods 21, one end of the extension rod 21 far away from the sampling probe 19 is inserted into the sealing cone 22, the sampling probe 19 is inserted into a specified position to be detected, the lower end face of the sealing cone 22 is located under the ground, the upper end face of the sealing cone 22 is located on the ground to prevent the gas in the air from entering the, a sampling probe rod 2 connected with a sampling main body 1 is communicated with one end of an extension rod 21 far away from a sampler 19 through a sealing cone 22, a rubber plug used for inserting a disposable syringe is arranged on the end face of a sampling device 23 positioned on one side of the sampling probe rod 2, a quick-connection port 16 communicated with the sampling main body 1 is connected with an analyzer 18 internally provided with a sampling pump 24, a well-flushing medium is sucked into the disposable syringe and injected into a shaft through the rubber plug for well flushing, a switch for controlling the sampling pump 24 is opened, a gas medium of a point to be measured is pressed into the sampling probe 19 through a small hole on the outer surface of the middle part of the sampling probe 19, the gas medium enters a first medium transmission hose 3 through the extension rod 21 and the sampling probe rod 2, and then the gas sequentially passes through the first medium transmission hose 3, a first right-angle elbow 4, a second medium transmission hose 8, a second right-angle elbow 7 and a second right-angle thin elbow 17 to enter a, the gas medium firstly passes through the circular hole filter 14 at the bottom of the filtering mechanism 15 through the gas inlet end of the filtering mechanism 15, the medium with the diameter larger than the aperture of the circular hole in the gas medium cannot pass through the circular hole filter 14, the medium with the diameter smaller than the aperture of the circular hole filter 14 in the gas medium can enter the linear filter 12 for secondary filtration through the gasket 13 positioned between the circular hole filter 14 and the linear filter 12, the moisture and impurities in the gas medium are removed through the circular hole filter 14 and the linear filter 12, the gas medium with the moisture and impurities removed passes through the gas outlet end of the filtering mechanism 15 and then sequentially passes through the third elbow 29, the third medium transmission hose 30 and the gas inlet end 32 of the panel type adjustable gas flowmeter, after the gas enters the gas flowmeter 5, the gas flowmeter 5 is adjusted, and the gas pressure is controlled by controlling the gas flow, so that the different flow rate requirements of different analyzers on, the gas medium with the flow rate adjusted passes through the gas outlet end 31 of the panel type adjustable gas flowmeter sequentially through the fourth medium transmission hose 9, the fourth elbow 27, the fifth medium transmission hose 26, the fifth elbow 10 and the sixth medium transmission hose 6, the sampled gas medium is connected into the analyzer 18 through the quick connector 16 at the tail end of the sixth medium transmission hose 6, after sampling is completed, a switch for controlling the sampling pump 24 is turned off, the connection between the quick connector 16 and the analyzer 18 is disconnected, the connection between the sampling probe rod 2 and the extension rod 21 is disconnected, and the extension rod 21 and the sampling probe 19 are pulled out from a specified detection point.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A soil gas stratified sampling device is characterized in that: comprises that
The sampling mechanism consists of a sampling main body (1), a sampling probe rod (2), a sampling probe (19), a plurality of connecting mechanisms (20) and extension rods (21) which are twice as many as the connecting mechanisms (20), and is used for carrying out layered sampling on soil and determining the optimal sampling time;
the well washing mechanism is used for injecting a well washing medium into the well washing mechanism through the sampling device (23) and carrying the medium in the shaft to the ground, so that the property of the medium in the shaft is changed to meet the process of operation requirements;
the filtering mechanism (15) is arranged on one side in the sampling main body (1) and is used for filtering the sampled medium and conveying the filtered medium into the analyzer (18) for analysis;
a media transfer hose arranged between the sampling mechanism and the filtering mechanism (15) for transferring the captured media.
2. The soil gas stratified sampler of claim 1, wherein: the outer end face of the sampling main body (1) is respectively provided with a first right-angle elbow (4), a second right-angle elbow (7), a third right-angle elbow (29), a fourth right-angle elbow (27) and a fifth right-angle elbow (10), one end of a first medium transmission hose (3) is communicated with a sampling probe rod (2) positioned at the bottom of the sampling main body (1), the other end of the first medium transmission hose (3) is communicated with one end of the first right-angle elbow (4) positioned at one side of the outer part of the sampling main body (1), the other end of the first right-angle elbow (4) is communicated with one end of the second right-angle elbow (7) through a second medium transmission hose (8), one side of the inner part of the sampling main body (1) is provided with a second right-angle thin elbow (17) corresponding to the second right-angle elbow (7), wherein one end of the second right-angle thin elbow (7) is pressed into the second right-angle elbow (7), the other end of the second right-angle thin elbow (17) is pressed into the air inlet end of the filtering mechanism (15), the third right-angle elbow (29) is located right above the filtering mechanism (15) and communicated with the air outlet end of the filtering mechanism (15), one side, far away from the second right-angle thin elbow (7), of the sampling main body (1) is provided with a panel type adjustable gas flowmeter (5), one end of a third medium transmission hose (30) is communicated with the third right-angle elbow (29), the other end of the third medium transmission hose (30) is communicated with the air inlet end (32) of the panel type adjustable gas flowmeter, one end of a fourth medium transmission hose (9) is communicated with the air outlet end (31) of the panel type adjustable gas flowmeter, the other end of the fourth medium transmission hose (9) is communicated with the fourth right-angle elbow (27) located on one side of the outer portion of the sampling main body (1), one end of a fifth medium transmission hose (26) is communicated with one end of a fourth elbow bend (27), the other end of the fifth medium transmission hose (26) is communicated with the fifth elbow bend (10) located on one side of the outer portion of the sampling main body (1), one end of a sixth medium transmission hose (6) is communicated with the fifth elbow bend (10), the other end of the sixth medium transmission hose (6) is provided with a quick-plugging port (16), the quick-plugging port (16) is connected with a gas analyzer (18), a sampling pump (24) for providing power for a sampler is arranged inside the gas analyzer (18), and the outer end face of the gas analyzer (18) is provided with a switch for controlling the sampling pump (24).
3. The soil gas stratified sampler of claim 2, wherein: the first right-angle elbow (4), the second right-angle elbow (7), the third right-angle elbow (29), the fourth right-angle elbow (27) and the fifth right-angle elbow (10) are hinged right-angle elbows, and the second straight thin-angle elbow (17) is a PP right-angle elbow with the same inner diameter size as the second right-angle elbow (7).
4. The soil gas stratified sampler of claim 1, wherein: set up and be in sampling probe rod (2) of sampling main part (1) bottom are cavity form tubular structure sampling probe rod (2) one side sets up sampling device (23) tip is provided with head (11), sampling device (23) with sampling probe rod (2) are the slant intercommunication form, sampling device (23) are used for passing through the well-flushing medium sampling probe rod (2) are injected into sampling well/hole, wherein, sampling device (23) joinable embeds VOC adsorbs the pipe box or sets up and is used for disposable syringe male rubber stopper.
5. The soil gas stratified sampler of claim 1, wherein: sampling probe rod (2) bottom is connected a sealed vertebra (22), sealed vertebra (22) bottom is provided with extension rod (21), wherein, arbitrary two be provided with a coupling mechanism (20) between extension rod (21), coupling mechanism (20) are used for with adjacent two extension rod (21) intercommunication, singly extension rod (21) length is 1 meter coupling mechanism (20) outside is provided with a sealing washer (25), sealing washer (25) be used for with extension rod (21) with coupling mechanism's (20) joint line seals, sealing washer (25) material is any one of them of silicon rubber, butyl cyanide rubber, ethylene propylene diene monomer.
6. The soil gas stratified sampler of claim 5, wherein: extension rod (21) bottom has a sampling probe (19) through coupling mechanism (20) intercommunication coupling mechanism (20) with sampling probe (19) outside is provided with a sealing washer (25), sampling probe (19) bottom is the back taper, the mid portion diameter of sampling probe (19) is less than the both ends part diameter of sampling probe (19), just the mid portion surface of sampling probe (19) is equipped with evenly distributed's aperture (28).
7. The soil gas stratified sampler of claim 1, wherein: filtering mechanism (15) from last to down constitute by linear filter (12), gasket (13) and round hole filter (14) in proper order, gasket (13) can be for the gas to pass through, just gasket (13) set up linear filter (12) with the centre of round hole filter (14) for increase area of contact between them, filtering mechanism (15) give vent to anger the internal surface of end be equipped with third elbow bend (29) assorted screw thread, filtering mechanism (15) give vent to anger the end with third elbow bend (29) carry out threaded connection, and the medium that will acquire loops through linear filter (12) with round hole filter (14) carry out filtering operation.
8. The soil gas stratified sampler of claim 7, wherein: the round hole filter (14) is a polytetrafluoroethylene microporous membrane filter with the pore diameter of 0.2 mu m.
9. A method for stratified sampling of soil gas using a sampler according to any one of claims 1 to 8, comprising the steps of:
s1, a sampling mechanism is installed, the length of a single extension rod (21) is 1 meter, the number of the extension rods (21) is determined according to the sampling depth requirement, the extension rods (21) are communicated with a connecting mechanism (20), a sampling probe (19) is connected to the bottom of the extension rods (21) through the connecting mechanism (20), a sealing ring (25) is arranged outside the connecting mechanism (20), the top of each extension rod (21) is inserted into a sealing cone (22) with the inner diameter matched with the outer diameter of each extension rod, the sampling probe (19) is inserted into a specified position to be detected, the lower end face of each sealing cone (22) is located under the ground, the upper end face of each sealing cone (22) is located on the ground, a sampling probe (2) connected with a sampling main body (1) is communicated with the top of each extension rod (21) through each sealing cone (22), and a quick insertion port (16) is connected into an analyzer (18);
s2, sampling, turning on a switch for controlling a sampling pump (24), pressing a gas medium at a designated point in soil into the sampling probe (19) through small holes (28) uniformly distributed on the outer surface of the middle part of the sampling probe (19), enabling the gas medium to enter a first medium transmission hose (3) which is positioned in a sampling main body (1) and communicated with the sampling probe (2) through an extension rod (21) and the sampling probe (2), enabling the gas medium to enter a first right-angle elbow (4) which is positioned at one side of the outer part of the sampling main body (1) and communicated with the first medium transmission hose (3), enabling the gas medium to enter a second right-angle elbow (7) which is positioned at one side of the outer part of the sampling main body (1) through a second medium transmission hose (8) which is communicated with the first right-angle elbow (4), the gas medium enters the air inlet end of the filtering mechanism (15) through a second straight thin-angle elbow (17) which is communicated with the second right-angle elbow (7) and is positioned on one side inside the sampling main body (1);
s3, removing water and dust from the sampled gas, enabling the sampled medium to pass through a round hole filter (14) arranged at the bottom of a filtering mechanism (15) through the gas inlet end of the filtering mechanism (15), enabling the medium with the diameter larger than the aperture of the round hole in the gas medium to not pass through the round hole filter (14), enabling the medium with the diameter smaller than the aperture of the round hole filter (14) in the gas medium to enter the linear filter (12) through a gasket (13) arranged between the round hole filter (14) and the linear filter (12) for filtering again, and removing water and impurities in the gas medium;
s4, adjusting the flow of a gas medium, enabling the gas medium without water and impurities to enter a third right-angle bend (29) which is communicated with the gas outlet end of a filtering mechanism (15) and is positioned on one side of the outer end face of the filtering mechanism (15) through the gas outlet end of the filtering mechanism (15), enabling the gas medium to enter a gas inlet end (32) of a panel type adjustable gas flowmeter through a third medium transmission hose (30) connected with the third right-angle bend (29), controlling the flow rate of the gas medium to be 80L/h through an adjustable gas flowmeter (5), enabling the gas medium with the flow rate adjusted to enter a fourth medium transmission hose (9) communicated with the gas outlet end (31) of the panel type adjustable gas flowmeter through the gas outlet end (31) of the panel type adjustable gas flowmeter, enabling the gas medium to enter a fifth medium transmission hose (26) through a fourth right-angle bend (27) which is communicated with the fourth medium transmission hose (9) and is positioned on one side of the outer portion of a sampling main body (1), and enabling the sampled gas medium to be connected to an analyzer (18) through a quick connection interface;
and S5, after sampling is finished, closing a switch for controlling the sampling pump (24), disconnecting the quick-connection port (16) from the analyzer (18), disconnecting the sampling probe rod (2) from the extension rod (21), and pulling the extension rod (21) and the sampling probe (19) out of the designated detection point.
10. A well washing method of a soil gas stratified sampler, which applies the well washing method of the sampler of claim 4, and is characterized by comprising the following steps:
s1, installing a well washing mechanism, determining the number of the extension rods (21) according to the sampling depth requirement, wherein the length of a single extension rod (21) is 1 m, communicating the extension rods (21) with a connecting mechanism (20), connecting a sampling probe (19) to the bottom of the extension rod (21) through the connecting mechanism (20), the method comprises the following steps that a sealing ring (25) is arranged outside a connecting mechanism (20), the top of an extension rod (21) is inserted into a sealing cone (22) with the inner diameter matched with the outer diameter of the extension rod, a sampling probe (19) is inserted into a specified position to be detected, the lower end face of the sealing cone (22) is located under the ground, the upper end face of the sealing cone (22) is located on the ground, a sampling probe rod (2) connected with a sampling main body (1) is communicated with the top of the extension rod (21) through the sealing cone (22), and the end face of a sampling device (23) located on one side of the sampling probe rod (2) is provided with a rubber plug head for inserting a disposable syringe;
s2, washing the well, inserting the sampling device into the shaft, sucking the well washing medium into the disposable injector, and injecting the well washing medium into the shaft through the rubber plug head to wash the well;
and S3, completing well washing, disconnecting the sampling probe rod (2) and the extension rod (21), and pulling the extension rod (21) and the sampling probe (19) out of the designated detection point.
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| CN202010516153.7A CN111474019A (en) | 2020-06-09 | 2020-06-09 | Soil gas layered sampler and sampling well-flushing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112642A (en) * | 2020-09-29 | 2020-12-22 | 重庆地质矿产研究院 | Gas detection system and method for shale gas exploitation |
| CN112881109A (en) * | 2021-01-22 | 2021-06-01 | 上海建科环境技术有限公司 | High-precision soil gas single-hole multilayer sampling device |
-
2020
- 2020-06-09 CN CN202010516153.7A patent/CN111474019A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112112642A (en) * | 2020-09-29 | 2020-12-22 | 重庆地质矿产研究院 | Gas detection system and method for shale gas exploitation |
| CN112881109A (en) * | 2021-01-22 | 2021-06-01 | 上海建科环境技术有限公司 | High-precision soil gas single-hole multilayer sampling device |
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