CN113075283A - Near-ground gas exchange measuring device - Google Patents
Near-ground gas exchange measuring device Download PDFInfo
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- CN113075283A CN113075283A CN202110281569.XA CN202110281569A CN113075283A CN 113075283 A CN113075283 A CN 113075283A CN 202110281569 A CN202110281569 A CN 202110281569A CN 113075283 A CN113075283 A CN 113075283A
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- vocs
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- gas exchange
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
- G01N27/66—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber and measuring current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a near-ground gas exchange measuring device, which comprises a metal support, a PFA pipe, a particulate filter, a VOCs monitor, a multi-channel VOCs data collector and an air pump, wherein the PFA pipe adopts a mode of connecting 1/8-inch PFA pipes and 1/4-inch PFA pipes in series in the front-back direction; the metal support is arranged vertical to the ground, and holes are formed at different heights of two adjacent surfaces for mounting 1/8-inch PFA pipes; 1/8 inch PFA pipe and 1/4 inch PFA pipe pass through stainless steel reducing cutting ferrule and connect the intercommunication, and the air inlet of VOCs monitor is provided with particulate filter, passes through the hose connection between VOCs monitor, multichannel VOCs data collection ware and the aspiration pump. The monitoring device has little influence on microclimate environment and a near-surface air layer, can also reduce the target of disturbance air state, and can realize on-line monitoring.
Description
Technical Field
The invention relates to the technical field of atmospheric monitoring, in particular to a near-ground gas exchange measuring device.
Background
The mutual exchange of volatile organic compounds between soil and atmosphere can be realized through the effects of sedimentation, volatilization, diffusion and the like, and the judgment of the migration direction between gas-ground interfaces and the quantitative description of exchange flux are important processes for recognizing the tendency of the migration of the volatile organic compounds in the environment and the emission of secondary pollution.
By measuring the variation of the volatile organic compounds in the soil and the near-surface atmosphere along with the height, the migration direction between the gas and the ground can be judged, and the exchange flux between the two phases can be indirectly estimated.
The concentration of volatile organic compounds in the ambient atmosphere is extremely low, and the volatile organic compounds are influenced by multiple environmental factors, so that quantitative characterization is very difficult. The current methods for collecting the near-surface concentration information of the trace pollutants mainly comprise the following steps: a flux box method, an active sampling method, and a passive sampling method.
In the measuring method, the flux box method creates a relatively closed system, so that various factors of microclimate environments such as air temperature, air speed and the like in the flux box are changed to different degrees; the active sampling method can generate strong disturbance to the air near the surface when the air pump pumps air; passive sampling methods typically require months of sampling time.
Disclosure of Invention
The invention aims to provide a near-surface ground gas exchange measuring device to solve the problems in the prior art, the device has little influence on microclimate environment and a near-surface air layer, and can realize on-line monitoring.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a near-ground gas exchange measuring device, which comprises a metal support, a PFA pipe, a particulate filter, a VOCs monitor, a multi-channel VOCs data collector and an air pump, wherein the PFA pipe adopts a mode of connecting 1/8-inch PFA pipes and 1/4-inch PFA pipes in series front and back; the metal support is arranged perpendicular to the ground, and holes are formed at different heights of two adjacent surfaces for installing the 1/8-inch PFA pipe; 1/8 inch PFA pipe and 1/4 inch PFA pipe pass through stainless steel reducing cutting ferrule and connect the intercommunication, the air inlet of VOCs monitor is provided with particulate filter, pass through the hose connection between VOCs monitor, multichannel VOCs data collection ware and the aspiration pump.
Preferably, the whole metal bracket is of a cuboid structure, and the cross section of the metal bracket is square; straight holes penetrating through the metal support are distributed at different heights of the metal support and are respectively positioned on two adjacent surfaces of the metal support, so that two groups of 1/8PFA tubes form an included angle of 90 degrees and respectively face to two different directions; each straight hole is provided with a vertically threaded hole, and the 1/8-inch PFA pipe can be fixed through the matching of a screw and the straight hole.
Preferably, the metal bracket is made of stainless steel.
Preferably, circular holes are symmetrically and uniformly distributed on two sides of the air inlet end of the 1/8PFA pipe.
Preferably, the particulate filter employs a PFA particulate filter.
Preferably, a PID sensor is arranged in the VOCs monitor, and a temperature and humidity sensor is arranged in the VOCs monitor, so that the environmental temperature and the relative humidity information can be synchronously measured; the VOCs monitor communicates with a multi-channel VOCs data collector or a computer through a connecting cable.
Preferably, the multi-channel VOCs data collector is connected with the 10-channel VOCs monitor, provides the electric quantity required by the VOCs monitor during operation, can collect the data measured by the VOCs monitor, and realizes the display, storage and export of the data; when the VOCs monitor operates, the multi-channel VOCs data collector can be connected with a computer, and real-time data can be displayed at the computer end.
Preferably, the suction pump is a rotary vane pump.
Compared with the prior art, the invention has the following beneficial technical effects:
the near-surface ground gas exchange measuring device has little influence on microclimate environment and a near-surface air layer, can reduce the target of air disturbance state, and can realize on-line monitoring.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a near-surface ground gas exchange measurement device;
2a, 2b and 2c in FIG. 2 are respectively a front view plane, a left view plane and a right view plane of the vertical support;
FIG. 3 is a schematic view of the construction of an 1/8 inch PFA tube in the apparatus of FIG. 1;
fig. 4a, 4b and 4c are schematic structural diagrams of an air inlet channel section, a front view plane and a lower view plane of the VOCs monitor of fig. 1, respectively;
the system comprises a 1-rotary vane pump, a 2-hose, a 3-multichannel VOCs data collector, a 4-USB data line, a 5-computer, a 6-RS-485 communication cable, a 7-VOCs monitor, an 8-particulate filter, a 9-1/4-inch PFA pipe, a 10-reducing ferrule connector 1/4-1/8, an 11-1/8-inch PFA pipe, a 12-metal support, a 13-screw, a central protruding area of an air inlet channel of the 7a-VOCs monitor, an inlet and outlet pipeline of the 7b-VOCs monitor, an air inlet channel cavity of the 7c-VOCs monitor, a circular hole of the 11 a-1/8-inch PFA pipe, a zero-position hole of the 12 a-metal support, a simple straight hole of the 12 b-vertical support and a threaded hole of the 12 c-vertical support.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a near-surface ground gas exchange measuring device to solve the problems in the prior art, the device has little influence on microclimate environment and a near-surface air layer, and can realize on-line monitoring.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-4, the present embodiment provides a structure diagram of a near-ground-to-ground-gas exchange measurement apparatus, and as shown in the figure, the apparatus of the present invention includes an air pump, a multi-channel VOCs data acquisition device 3, a computer 5, 10 VOCs monitoring instruments 7, a particulate filter 8, an 1/4-inch PFA tube 9, a 1/8-inch PFA tube 11, a metal bracket 12, a USB data line 4, an RS-485 communication cable 6, and a hose 2.
Specifically, in the present embodiment, the air pump adopts a rotary vane pump 1, and the rotary vane pump 1, the multi-channel VOCs data collector 3 and the VOCs monitor 7 are connected through a hose 2; the multichannel VOCs data collector 3 adopts a USB data line 4 and an RS-485 communication cable 6 to respectively communicate with a computer 5 and a VOCs monitor 7.
The devices of this embodiment are connected in the following order: one end of an 1/8-inch PFA pipe 11 is communicated with one end of a 1/4-inch PFA pipe 9 through a stainless steel reducing ferrule connector 1/4-1/810, the other end of the 1/4-inch PFA pipe 9 is communicated with an air inlet of a particulate filter 8, an air outlet of the particulate filter 8 is communicated with an air inlet of a VOCs monitor 7, an air outlet of the VOCs monitor 7 is communicated with an air inlet of a multi-channel VOCs data collector 3 through a hose 2, and an air outlet of the multi-channel VOCs data collector 3 is communicated with an air inlet of a vane rotary pump 1 through another hose 2, so that an air flow channel is formed.
Referring to fig. 2, the metal holder 12 has a height of 600mm and a cross-section of 14mm × 14mm, which is a square, stainless steel material. The metal bracket 12 is divided into an upper part and a lower part by a zero hole 12a at the height of 200mm, the upper part is provided with a simple straight hole 12b (with the radius of 1.65mm) which completely penetrates through the metal bracket 12 at the height of 5, 15, 30, 50, 70, 100, 140, 190, 290 and 390mm (with the zero hole as a zero point), wherein the simple straight hole 12b with the height of 5, 30, 70, 140 and 290mm and the simple straight hole 12b with the height of 15, 50, 100, 190 and 390mm are respectively positioned on two adjacent surfaces, so that two groups of 1/8PFA pipes 11 respectively face to two different directions at an included angle of 90 degrees to avoid mutual interference between the pipes. In addition, each of the simple straight holes 12b is provided with a vertically threaded hole 12c, and the 1/8-inch PFA pipe 11 can be fixed in cooperation with the simple straight hole 12b by a screw 13 having an outer diameter of 3 mm. The lower portion of the metal bracket 12 may be vertically inserted into the ground for fixing.
In order to reduce the influence of the device on the air circulation, the volume of the air inlet end should be reduced as much as possible, and the air inlet passage of the embodiment adopts 1/8 inches PFA pipe 11 to connect 1/4 inches PFA pipe 9 in series, so that the influence of the air inlet end on the air circulation can be reduced, because the volume of the air inlet end of the device is smaller compared with that of the 1/4 inches PFA pipe 9 alone. However, when the flow rate of the evacuation air is constant, since the inner diameter of the 1/8-inch PFA tube 11 is smaller than that of the 1/4-inch PFA tube 9, the flow rate of the gas entering the former is larger than that of the latter, and the disturbance to the air is larger. Referring to fig. 3, 16 circular holes 11a with the diameter of 1.2mm are symmetrically distributed on two sides of the air inlet end of an 1/8PFA pipe 11 adopted by the device, and the total cross-sectional area of the air inlet hole is 20.096mm2. By increasing the total cross-sectional area of the air inlet holes of the air inlet end of the 1/8PFA pipe 11 through the structure, the flow speed of air entering the pipe can be reduced, and the aim of reducing the air disturbance state is fulfilled. The flow rate of single-path sampling of the device is 50mL/min, and the flow rate of gas entering the tube is about 4.15 cm/s.
The built-in PID sensor of the VOCs monitor 7 of the embodiment has the range of 2000ppb, the resolution of 0.1ppb, the energy of an ultraviolet lamp of 10.6eV, and the concentration is calibrated by isobutene. The working principle of the PID sensor is as follows: VOCs in the ambient atmosphere are ionized under the excitation of 10.6eV ultraviolet light through a photoionization effect, a current signal obtained through measurement is in linear proportion to the concentration of the VOCs, and the equivalent concentration of isobutene of the VOCs can be obtained through conversion. Referring to fig. 4, the component is an air inlet channel of the VOCs monitor 7, is made of PFA, and is located right above the PID sensor. The central protruding region 7a of the air inlet channel coincides with the sensing region of the PID sensor, the diffusion range of air in the air inlet channel cavity 7c is limited in the space right above the sensing region of the PID sensor by the structure, and the response sensitivity of the VOCs monitor 7 can be effectively improved. The inlet passage inlet-outlet duct 7b had an outer diameter of 1/4 inches and an inner diameter of 3 mm. Meanwhile, a temperature and humidity sensor is arranged in the VOCs monitor 7, so that the ambient temperature and the relative humidity can be synchronously measured and stored in the main board.
In order to avoid particulate matter to get into VOCs monitor 7 and cause the interference, be provided with 47mm PFA particulate matter filter 8 at the air inlet of VOCs monitor, can directly be connected with VOCs monitor 7 and 1/4 inches PFA pipe 9, the filter membrane chooses for use 5um of aperture, diameter 47 mm's PTFE (polytetrafluoroethylene) filter membrane.
The multichannel VOCs data collection device 3 of this embodiment integrates power supply, communication and flow control of the 10-channel VOCs monitor 7. When multichannel VOCs data collection ware 3 is connected with 10 way VOCs monitor 7, can provide required electric quantity when VOCs monitor 7 moves, and acquire VOCs monitor 7 measured minute average data every 5 seconds to realize demonstration, storage and the derivation of data. When the VOCs monitor 7 runs, the multi-channel VOCs data collector 3 can also be connected with the computer 5, and the computer end 5 can display real-time synchronous data. Multichannel VOCs data collection ware 3 adopts the mode of restricted aperture to independently regulate and control 10 way VOCs monitor 7's flow, and the gas circuit is constituteed to be: the gas inlet, the particulate matter filter, the flow limiting hole and the gas outlet are connected with the external rotary vane pump 1, the pressure value at the outlet is monitored, and when the rotary vane pump 1 normally operates, the pressure value is less than 50 Kpa.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides a near-surface ground gas exchange measuring device which characterized in that: the device comprises a metal bracket, a PFA pipe, a particulate filter, a VOCs monitor, a multi-channel VOCs data collector and an air pump, wherein the PFA pipe adopts a mode of connecting 1/8-inch PFA pipes and 1/4-inch PFA pipes in series front and back; the metal support is arranged perpendicular to the ground, holes are formed in two adjacent surfaces of the metal support at different heights, and the holes are used for installing and fixing the 1/8-inch PFA pipe; 1/8 inch PFA pipe and 1/4 inch PFA pipe pass through stainless steel reducing cutting ferrule and connect the intercommunication, with PFA union coupling VOCs monitor's air inlet is provided with particulate matter filter, pass through the hose connection between VOCs monitor, multichannel VOCs data collection ware and the aspiration pump.
2. The near-surface earth-gas exchange measurement device of claim 1, wherein: the whole metal bracket is of a cuboid structure, and the cross section of the metal bracket is square; straight holes penetrating through the metal support are distributed at different heights of the metal support and are respectively positioned on two adjacent surfaces of the metal support, so that two groups of 1/8PFA tubes form an included angle of 90 degrees and respectively face to two different directions; each straight hole is provided with a vertically threaded hole, and the 1/8-inch PFA pipe can be fixed through the matching of a screw and the straight hole.
3. The near-surface earth-gas exchange measurement device of claim 1, wherein: the metal bracket is made of stainless steel.
4. The near-surface earth-gas exchange measurement device of claim 1, wherein: circular holes are symmetrically and uniformly distributed on two sides of the air inlet end of the 1/8PFA pipe.
5. The near-surface earth-gas exchange measurement device of claim 1, wherein: the particulate filter is a PFA particulate filter.
6. The near-surface earth-gas exchange measurement device of claim 1, wherein: a PID sensor is arranged in the VOCs monitor, and a temperature and humidity sensor is arranged in the VOCs monitor, so that environmental temperature and humidity information can be synchronously measured; the VOCs monitor communicates with a multi-channel VOCs data collector or a computer through a connecting cable.
7. The near-surface earth-gas exchange measurement device of claim 1, wherein: the multichannel VOCs data collector is connected with the 10-channel VOCs monitor, provides electric quantity required by the VOCs monitor during operation, can collect data measured by the VOCs monitor, and realizes display, storage and export of the data; when the VOCs monitor operates, the multi-channel VOCs data collector is connected with a computer, and the computer can display real-time data.
8. The near-surface earth-gas exchange measurement device of claim 1, wherein: the air pump is a rotary vane pump.
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| CN202110281569.XA CN113075283A (en) | 2021-03-16 | 2021-03-16 | Near-ground gas exchange measuring device |
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| CN202110281569.XA CN113075283A (en) | 2021-03-16 | 2021-03-16 | Near-ground gas exchange measuring device |
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2021
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005087840A (en) * | 2003-09-16 | 2005-04-07 | Takenaka Komuten Co Ltd | In situ measuring method and in situ cleaning method of soil and groundwater |
| CN2725883Y (en) * | 2004-08-11 | 2005-09-14 | 河南省核工业放射性核素检测中心 | Active air radioactive sampler |
| JP2008058060A (en) * | 2006-08-30 | 2008-03-13 | Chem Grouting Co Ltd | Contaminant concentration measuring technique |
| CN101441146A (en) * | 2008-12-31 | 2009-05-27 | 扬州大学 | Collecting device of different depth soil gas |
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