CN115165482A - Greenhouse gas in-situ collection device and method - Google Patents
Greenhouse gas in-situ collection device and method Download PDFInfo
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- CN115165482A CN115165482A CN202210841607.7A CN202210841607A CN115165482A CN 115165482 A CN115165482 A CN 115165482A CN 202210841607 A CN202210841607 A CN 202210841607A CN 115165482 A CN115165482 A CN 115165482A
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- 239000005431 greenhouse gas Substances 0.000 title claims abstract description 53
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 187
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 230000004907 flux Effects 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000000725 suspension Substances 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 6
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- 150000001875 compounds Chemical class 0.000 claims description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 11
- 238000011282 treatment Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
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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
- G01N1/2273—Atmospheric sampling
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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
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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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
- G01N2001/242—Injectors or ejectors
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Abstract
The invention provides a greenhouse gas in-situ collection device, which comprises an in-situ collection device and a sampling and sample-reserving device, wherein the in-situ collection device comprises a gas collection box, the lower end of the gas collection box is provided with an opening, the upper end or the side surface of the gas collection box is connected with a gas guide pipe, and the gas guide pipe is connected with the sampling and sample-reserving device; the outer sides of two symmetrical ends or any two symmetrical side surfaces of the upper end surface of the gas collection box are respectively connected with a telescopic loop bar, the lower end of an outer sleeve of the telescopic loop bar is connected with the gas collection box, an inner pipe of the telescopic loop bar extends towards the upper end direction of the gas collection box, and a fastening screw sleeve is arranged at the joint of the outer sleeve and the inner pipe. Meanwhile, an in-situ greenhouse gas collection method is provided. The greenhouse gas in-situ acquisition device and the greenhouse gas in-situ acquisition method provided by the invention are suitable for greenhouse gas in-situ acquisition under various complex working conditions, can realize automatic acquisition, are accurate in acquired data, and are convenient for calculation to obtain accurate emission flux of greenhouse gas.
Description
Technical Field
The invention relates to a collecting device and a collecting method, in particular to an in-situ collecting device and a collecting method for greenhouse gases released by a water-gas interface or a mud-gas interface.
Background
In China, although the total economic quantity, the working personnel and the investment scale of the sewage treatment industry only account for one thousandth of the whole industry, the carbon emission amount accounts for 1% -2% of the total carbon emission amount of the whole society, and the method is a high carbon emission industry worthy of the name and is well recognized as one of the first ten carbon emission industries. With the proposition of the targets of carbon peak reaching and carbon neutralization, the sewage plant also becomes a key carbon reduction field, the completion of the carbon emission accounting of the sewage plant is the first step of carrying out the carbon reduction target of the sewage plant, and the accuracy of the accounting result plays a decisive role in the subsequent work. The accuracy of the check result depends on the accuracy of the on-site measured value, and simultaneously, higher requirements are provided for the on-site measuring method.
In all types of carbon emission of sewage plants, direct emission accounts for more than 30%, and direct emission is calculated at home and abroad mainly through an emission factor method and an actual measurement method. The emission factor method depends on empirical values summarized in the '2006 IPCC national greenhouse gas list guideline', and with continuous innovation of sewage plant processes, the practicability and the deviation value from the actual measurement are greatly reduced. Greenhouse gases in sewage plant structures are mainly released in a free diffusion and bubbling mode, for an actual measurement method, a static box method and a dynamic box method are mainly adopted at home and abroad, a collecting instrument needs to be fixed in a reaction structure during sampling, and the collecting instrument can be kept stable and good in air tightness under the action of aeration, stirring, plug flow and the like to cause severe fluctuation of water surface or large water flow speed, so that the implementation is very difficult, and the operation is inconvenient. And at present, most structures of sewage plants are subjected to covering and sealing treatment, the depth in the structures is large, large-scale instruments and equipment cannot be erected, and relevant data of greenhouse gas emission flux of water/mud-gas interfaces in the structures of the sewage plants cannot be obtained.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a greenhouse gas in-situ collection device and a greenhouse gas in-situ collection method, and solves the problem that the greenhouse gas in the sewage plant is difficult to sample at present.
In order to solve the technical problems, the invention provides the following technical scheme:
a greenhouse gas in-situ collection device comprises an in-situ collection device and a sampling and sample-reserving device, wherein the in-situ collection device comprises a gas collection box, the lower end of the gas collection box is provided with an opening, the upper end or the side surface of the gas collection box is connected with a gas guide pipe, and the gas guide pipe is connected with the sampling and sample-reserving device; the gas collection box is characterized in that two symmetrical ends of the upper end face of the gas collection box or the outer sides of any two symmetrical side faces are respectively connected with a telescopic loop bar, the lower end of an outer sleeve of the telescopic loop bar is connected with the gas collection box, an inner tube of the telescopic loop bar extends towards the upper end direction of the gas collection box, and a fastening screw sleeve is arranged at the joint of the outer sleeve and the inner tube.
Furthermore, the inside of gas collection case is provided with electronic little fan, and quantity is two, respectively is provided with one on two arbitrary symmetrical sides.
Furthermore, the outer sleeve lower extreme pass through the swivelling joint seat with the gas collection case is connected, the outer sleeve lower extreme with be dismantled between the swivelling joint seat and be connected.
Furthermore, four corners of the upper end face of the gas collecting box are respectively provided with a suspension rope clamping ring, each suspension rope clamping ring is connected with a suspension rope, the upper ends of the four suspension ropes are jointly connected with a cable rope, and the suspension rope clamping rings are detachably connected with the suspension ropes.
Furthermore, the outsides of any two symmetrical side surfaces of the gas collecting box are respectively provided with a foam floating plate; and a balancing weight is respectively arranged in any two symmetrical side surfaces of the gas collection box.
Furthermore, the sampling and sample reserving device comprises a base, wherein a control system and a circulating conveying system are arranged on the upper end surface of the base, and a plurality of gas collecting bottles are arranged on the circulating conveying system; the gas collecting bottle comprises a base, and is characterized in that a lifting mechanism is arranged on the side face of the base, the lifting mechanism is connected with a gas injection device, the gas injection device is connected with the gas guide tube, and the gas injection device is positioned right above any one gas collecting bottle.
Furthermore, the circular conveying system comprises a track groove, a plurality of limiting seats are arranged in the track groove, one gas collecting bottle is arranged on each limiting seat, a friction driving belt is sleeved on the periphery of each limiting seat, a driving belt wheel is arranged in a matched mode with the friction driving belt, the driving belt wheel is connected with a stepping motor through a transmission shaft, and the stepping motor is connected with the control system.
Further, elevating system includes the lift cylinder, the lift cylinder with control system connects, the lifter upper end of lift cylinder is connected with vertical connecting rod, the lower extreme of vertical connecting rod with the lifter is connected, the upper end of vertical connecting rod is connected with horizontal connecting rod perpendicularly, the lower terminal surface of horizontal connecting rod is connected with gas injection device.
Further, the gas collecting bottle is the vacuum gas collecting bottle who has the rubber buffer, gas injection device is syringe needle down, be provided with the automatically controlled valve on the syringe, the automatically controlled valve with control system connects, vertical connecting rod and the inside gas-supply pipe that is provided with of horizontal connecting rod, the upper end of syringe with horizontal connecting rod connect and with the gas-supply pipe intercommunication, the other end of gas-supply pipe by vertical connecting rod side is worn out and with the gas guide pipe is connected.
The greenhouse gas in-situ collection method adopting the greenhouse gas in-situ collection device comprises the following steps:
(1) Adjusting the length of the telescopic sleeve according to the environmental condition, then placing the gas collection tank on a water-gas interface to enable the gas collection tank to float on the water surface and draft for 3-4cm, and keeping the gas collection tank and the gas guide tube in a sealed state;
(2) Starting the sampling and sample reserving device, driving the gas injection device to descend by the lifting mechanism, injecting the collected gas into the gas collecting bottle through the gas injection device, driving the gas injection device to reset by the lifting mechanism, removing the gas collecting bottle injected with the gas by the circulating conveying system, conveying a new gas collecting bottle to the lower part of the gas injection device, and repeating the processes according to a preset time interval to finish the sampling and sample reserving work of a specified number of samples;
(3) Sending the sample back to a laboratory, measuring the concentration of the greenhouse gas in the collected gas by using a gas chromatograph, then drawing a concentration-time scatter diagram, fitting a straight line to obtain a linear equation and a slope K, and obtaining the flux of the greenhouse gas at the water-gas interface by the following calculation formula:
in the formula (I), the compound is shown in the specification,
f-greenhouse gas flux (μ g. M) -2 ·d -1 )；
K-slope of the fitted "concentration-time" line;
f1-ppm and. Mu.g.m 3 The unit conversion coefficient of (2);
f2-conversion of min to day (1440);
v-effective volume (m) of gas collecting device 3 )；
A-area of the gas collecting device at the water/mud-gas interface (m) 2 )；
F3-Unit conversion factor of. Mu.g to mg (1000).
The invention has the following beneficial effects:
(1) The device and the method adopt an in-situ collection means, realize the in-situ collection of the water/mud-gas interface greenhouse gas under the complex working condition represented by the sewage plant structure, solve the problem that the traditional greenhouse gas collection device is difficult to keep the air tightness and stability due to factors such as aeration, stirring, rotational flow, plug flow or large flow velocity in the structure, and enable the sampling detection data to be closer to the real working condition;
(2) The device and the method can be adjusted according to different sampling environments, can adapt to various sampling environments by adjusting the inclination angle and the length of the telescopic sleeve rod and the lengths of the air guide pipe and the suspension rope, and can carry out in-situ collection on various types of gases including but not limited to greenhouse gases released by water/mud-gas interfaces of various different types of water bodies (such as rivers, river channels, municipal sewers, lakes, tang Ku systems, wetland systems and the like) including but not limited to structures in sewage plants;
(3) The equipment and the method can realize automatic timing sampling, get rid of the limitation of sampling frequency, reduce the interference on the environment of a sampling point caused by manual acquisition and avoid errors caused by manual operation;
(4) According to the equipment and the method, the greenhouse gas samples of a plurality of water/mud-gas interfaces at equal time intervals are collected, the concentration of related gas is measured by a laboratory gas chromatograph, a time-concentration curve is drawn and fitted, and the gas emission flux is calculated. The method provides powerful data support for carbon footprint accounting of the sewage treatment plant, and simultaneously solves the problem that related sampling equipment and method are lacked in the current research on greenhouse gas emission flux, gas generation amount and release rule of the water/mud-gas interface under complex water surface conditions.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the in-situ collection apparatus of the present invention;
FIG. 2 is a schematic diagram of the sampling and sample-retaining device according to the present invention;
FIG. 3 is a graph of data and fitting results for methane collection using the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
A greenhouse gas in-situ collection device comprises an in-situ collection device and a sampling and sample reserving device, wherein the in-situ collection device is shown in figure 1, the in-situ collection device comprises a gas collection box 1, the lower end of the gas collection box 1 is provided with an opening, the upper end of the gas collection box 1 is connected with a gas guide pipe 2, and the gas guide pipe 2 is connected with the sampling and sample reserving device; the outer sides of two symmetrical sides of the gas collection box 1 are respectively connected with a telescopic loop bar 3, the lower end of an outer sleeve of the telescopic loop bar is connected with the gas collection box, an inner tube of the telescopic loop bar extends towards the upper end of the gas collection box, and a fastening screw sleeve is arranged at the joint of the outer sleeve and the inner tube.
The working principle is as follows:
the length of telescopic sleeve is adjusted according to the distance between operating personnel and the surface of water, and the upper end of the inner tube is held by the operating personnel to place the gas collecting box on the surface of water stably, collects the gas mixture through the air duct and sends the gas mixture to the sampling and sample reserving device.
The inside of gas collection case 1 is provided with electronic little fan 4, and quantity is two, respectively is provided with one on two symmetrical sides. The small electric fan is used for uniformly mixing the gas in the gas collecting box, so that the accuracy of the concentration of the greenhouse gas is ensured.
The outer tube lower extreme passes through swivelling joint seat 5 and is connected with gas collection tank 1, can alternate the angle between flexible loop bar and the gas collection tank, is convenient for deal with the sampling interface and is not under the condition under operating personnel.
Four corners of the upper end face of the gas collecting box 1 are respectively provided with a suspension rope clamping ring 6, each suspension rope clamping ring 6 is connected with a suspension rope 7, and the upper ends of the four suspension ropes 7 are jointly connected with a mooring rope 8. For some environments with calm water flow, the gas collecting box can be suspended by cables, so that labor is saved.
The lower end of the outer sleeve is detachably connected with the rotary connecting seat, and the suspension rope clamping ring is detachably connected with the suspension rope. The fixing is carried out by selecting a telescopic loop bar or a suspension rope or both according to the condition of a water/mud-gas interface in the structure (the used tool is not required to be detachable). For structures with aeration, rotational flow, stirring, plug flow or large water flow speed, such as a rotational flow grit chamber and an aeration grit chamber in primary treatment, an aerobic zone of an A2O process in secondary treatment, a high oxygen dissolving zone of an oxidation ditch, a denitrification deep bed filter in tertiary treatment and the like, the gas collection box is fixed on the wall body or a railing of the structure through the telescopic sleeve rod, and the gas collection box is kept from moving transversely, longitudinally or laterally along with water flow. For structures with relatively smooth water flow, such as a hydrolysis acidification tank in primary treatment, an anoxic and anaerobic zone of an A2O process in secondary treatment, an SBR process, a low dissolved oxygen zone of an oxidation ditch, an advection and radial flow secondary sedimentation tank, a high-efficiency sedimentation tank in tertiary treatment, a biological rotating disc filter tank, a sludge storage tank and the like, a gas collection tank is tied on a fixable object through a suspension rope to keep the fixable object stable or relatively static.
The outsides of two symmetrical side surfaces of the gas collection box 1 are respectively provided with a foam floating plate 9; two balancing weights 10 are respectively arranged in the two symmetrical side surfaces of the gas collecting box 1. The parts are mainly used for fixing the gas collecting box by adopting the suspension ropes, so that the gas collecting box can stably float on the water surface.
The following describes the selection of the above components:
the gas collection box is formed by sticking and splicing a plurality of polypropylene plates;
the foam floating plate is formed by cutting solid foam;
the balancing weight block is made of iron blocks with uniform mass distribution;
the gas-guide tube adopts a polytetrafluoroethylene tube with smaller diameter;
the telescopic sleeve rod is made of aluminum alloy.
The connecting part of the air duct 2 and the air collection box 1 is provided with a sealing ring, and the sealing ring is formed by adhering a rubber pad, glass cement and a polypropylene plate.
A red water thermometer 11 is inserted at the side of the gas guide tube 2, the measuring range is-50 ℃ to 50 ℃, and the thermometer is used for recording the temperature in the gas collection box and can be used as an auxiliary parameter for measuring the concentration of greenhouse gas.
As shown in fig. 2, the sampling and sample-retaining device includes a base 12, a control system 13 and a circulating conveying system are arranged on the upper end surface of the base 12, and a plurality of gas collection bottles 14 are arranged on the circulating conveying system; the side surface of the base 12 is provided with a lifting mechanism, the lifting mechanism is connected with a gas injection device, the gas injection device is connected with a gas guide pipe, and the gas injection device is positioned right above any gas collecting bottle.
The circulating conveying system comprises a track groove, a plurality of limiting seats 15 are arranged in the track groove, a gas collecting bottle 14 is arranged on each limiting seat 15, a friction driving belt 16 is sleeved on the periphery of each limiting seat 15, a driving belt wheel 17 is arranged on the friction driving belt 16 in a matched mode, the driving belt wheel 17 is connected with a stepping motor 19 through a transmission shaft 18, and the stepping motor 19 is connected with a control system 13. The stepping motor controls the periodic movement of the gas collecting bottle, and the gas collecting bottle moves one distance at a time and is used for replacing the gas collecting bottle right below the gas injection device.
The lifting mechanism comprises a lifting cylinder, the lifting cylinder is connected with the control system 13, the upper end of a lifting rod 20 of the lifting cylinder is connected with a vertical connecting rod 21, the lower end of the vertical connecting rod 21 is connected with the lifting rod 20, the upper end of the vertical connecting rod 21 is vertically connected with a horizontal connecting rod 22, and the lower end face of the horizontal connecting rod 22 is connected with a gas injection device.
The gas collecting bottle 14 is a vacuum gas collecting bottle with a rubber plug, the gas injection device is an injector 23 with a downward needle, an electric control valve 24 is arranged on the injector 23, the electric control valve 24 is connected with the control system 13, gas conveying pipes 25 are arranged inside the vertical connecting rod 21 and the horizontal connecting rod 22, the upper end of the injector 23 is connected with the horizontal connecting rod 22 and communicated with the gas conveying pipes 25, and the other end of the gas conveying pipes 25 penetrates out of the side face of the vertical connecting rod 21 and is connected with the gas guide pipes 2.
The greenhouse gas in-situ collection method adopting the greenhouse gas in-situ collection device comprises the following steps:
(1) Selecting a telescopic loop bar or a suspension rope according to the environmental condition, then placing the gas collection tank on a water-gas interface to enable the gas collection tank to float on the water surface and draft for 3-4cm, and starting the small electric fan, wherein the gas collection tank and the gas guide pipe are kept in a sealed state;
(2) Starting a sampling and sample reserving device, descending a lifting rod of a lifting cylinder to drive an injector to descend, inserting a needle of the injector into a gas collecting bottle, opening an electric control valve at the moment, enabling gas in a gas collecting box to enter the gas collecting bottle through a gas guide pipe, a gas conveying pipe and the injector, closing the electric control valve after the gas is injected, ascending the lifting rod of the lifting cylinder, separating the needle of the injector from the gas collecting bottle, starting a stepping motor, driving a driving shaft to drive a driving belt wheel to rotate, moving the gas collecting bottle with the injected gas by using a friction driving belt to move, moving the gas collecting bottle without the injected gas to the lower part of the injector, and completing primary gas collecting work;
(3) Sending the sample back to a laboratory, measuring the greenhouse gas concentration in the collected gas by using a gas chromatograph, then drawing a concentration-time scatter diagram, fitting a straight line to obtain a linear equation and a slope K, and obtaining the flux of the greenhouse gas at the water-gas interface by the following calculation formula:
in the formula (I), the compound is shown in the specification,
f-flux of greenhouse gas (μ g. M) -2 ·d -1 )；
K-slope of the fitted "concentration-time" line;
f1-ppm and. Mu.g.m 3 The unit conversion coefficient of (2);
f2-conversion factor of min to day (1440);
v-effective volume (m) of gas collecting device 3 )；
A-area of the gas collecting device at the water/mud-gas interface (m) 2 )；
F3-Unit conversion factor of. Mu.g to mg (1000).
The method for detecting the concentration of the greenhouse gas is referred to as gas chromatography (T/LCAA 005-2021) for measuring the concentration of methane, nitrous oxide and carbon dioxide in the gas.
Taking methane as an example, the collecting effect of the in-situ collecting device is verified, and various data and fitting results are shown in fig. 3, wherein the R square can reach more than 0.999, which shows that the in-situ collecting device has almost no air leakage, uniform gas distribution and excellent collecting effect.
The greenhouse gas in-situ acquisition device and the greenhouse gas in-situ acquisition method provided by the invention are suitable for greenhouse gas in-situ acquisition under various complex working conditions, can realize automatic acquisition, are accurate in acquired data, and are convenient for calculation to obtain accurate emission flux of greenhouse gas.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The greenhouse gas in-situ collection device is characterized in that: the sampling device comprises an in-situ collection device and a sampling and sample-reserving device, wherein the in-situ collection device comprises a gas collection box, the lower end of the gas collection box is provided with an opening, the upper end or the side surface of the gas collection box is connected with a gas guide pipe, and the gas guide pipe is connected with the sampling and sample-reserving device;
the gas collection box is characterized in that two symmetrical ends of the upper end face of the gas collection box or the outer sides of any two symmetrical side faces are respectively connected with a telescopic loop bar, the lower end of an outer sleeve of the telescopic loop bar is connected with the gas collection box, an inner tube of the telescopic loop bar extends towards the upper end direction of the gas collection box, and a fastening screw sleeve is arranged at the joint of the outer sleeve and the inner tube.
2. The in-situ greenhouse gas collection device according to claim 1, wherein: the inside of gas collection case is provided with electronic little fan, and quantity is two, respectively is provided with one on two arbitrary symmetrical sides.
3. The in-situ greenhouse gas collection device according to claim 1, wherein: the lower end of the outer sleeve is connected with the gas collecting box through a rotating connecting seat, and the lower end of the outer sleeve is detachably connected with the rotating connecting seat.
4. The in-situ greenhouse gas collecting device as claimed in claim 1, wherein: four corners of the upper end face of the gas collecting box are respectively provided with a suspension rope clamping ring, each suspension rope clamping ring is connected with a suspension rope, the upper ends of the four suspension ropes are jointly connected with a cable rope, and the suspension rope clamping rings are detachably connected with the suspension ropes.
5. The in-situ greenhouse gas collection device according to claim 4, wherein: the outsides of any two symmetrical side surfaces of the gas collection box are respectively provided with a foam floating plate;
and a balancing weight is respectively arranged in any two symmetrical side surfaces of the gas collection box.
6. The in-situ greenhouse gas collection device according to claim 1, wherein: the sampling and sample reserving device comprises a base, wherein a control system and a circulating conveying system are arranged on the upper end surface of the base, and a plurality of gas collecting bottles are arranged on the circulating conveying system;
the gas collecting bottle comprises a base, and is characterized in that a lifting mechanism is arranged on the side face of the base, the lifting mechanism is connected with a gas injection device, the gas injection device is connected with the gas guide tube, and the gas injection device is positioned right above any one gas collecting bottle.
7. The in-situ greenhouse gas collection device according to claim 6, wherein: the circular conveying system comprises a track groove, a plurality of limiting seats are arranged in the track groove, one gas collecting bottle is arranged on each limiting seat, a friction driving belt is sleeved on the periphery of each limiting seat, a driving belt wheel is arranged on the friction driving belt in a matched mode, the driving belt wheel is connected with a stepping motor through a transmission shaft, and the stepping motor is connected with the control system.
8. The in-situ greenhouse gas collection device according to claim 6, wherein: the lifting mechanism comprises a lifting cylinder, the lifting cylinder is connected with the control system, a vertical connecting rod is connected to the upper end of a lifting rod of the lifting cylinder, the lower end of the vertical connecting rod is connected with the lifting rod, a horizontal connecting rod is perpendicularly connected to the upper end of the vertical connecting rod, and the lower end face of the horizontal connecting rod is connected with the gas injection device.
9. The in-situ greenhouse gas collection device according to claim 8, wherein: the gas collecting bottle is the vacuum gas collecting bottle who has the rubber buffer, gas injection device is syringe needle down, be provided with the automatically controlled valve on the syringe, the automatically controlled valve with control system connects, vertical connecting rod and the inside gas-supply pipe that is provided with of horizontal connecting rod, the upper end of syringe with horizontal connecting rod connect and with the gas-supply pipe intercommunication, the other end of gas-supply pipe by vertical connecting rod side wear out and with the gas-guide pipe is connected.
10. An in-situ greenhouse gas collection method using the in-situ greenhouse gas collection device as claimed in any one of claims 6 to 9, comprising the steps of:
(1) Adjusting the length of the telescopic sleeve according to the environmental condition, then placing the gas collection tank on a water-gas interface to enable the gas collection tank to float on the water surface and draft for 3-4cm, and keeping the gas collection tank and the gas guide tube in a sealed state;
(2) Starting the sampling and sample reserving device, driving the gas injection device to descend by the lifting mechanism, injecting the collected gas into the gas collecting bottle through the gas injection device, driving the gas injection device to reset by the lifting mechanism, removing the gas collecting bottle injected with the gas by the circulating conveying system, conveying a new gas collecting bottle to the lower part of the gas injection device, and repeating the processes according to a preset time interval to finish the sampling and sample reserving work of a specified number of samples;
(3) Sending the sample back to a laboratory, measuring the concentration of the greenhouse gas in the collected gas by using a gas chromatograph, then drawing a concentration-time scatter diagram, fitting a straight line to obtain a linear equation and a slope K, and obtaining the flux of the greenhouse gas at the water-gas interface by the following calculation formula:
in the formula (I), the compound is shown in the specification,
f-flux of greenhouse gas (μ g. M) -2 ·d -1 )；
K-slope of the fitted "concentration-time" line;
f1-ppm and. Mu.g.m 3 The unit conversion coefficient of (1);
f2-conversion factor of min to day (1440);
v-effective volume (m) of gas collecting device 3 )；
A-area of gas collection device and Water/mud-gas interface (m) 2 )；
F3-Unit conversion factor of. Mu.g to mg (1000).
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