CN204405388U - A kind of adjustable-depth soil carbon dioxide harvester - Google Patents

A kind of adjustable-depth soil carbon dioxide harvester Download PDF

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Publication number
CN204405388U
CN204405388U CN201520011638.5U CN201520011638U CN204405388U CN 204405388 U CN204405388 U CN 204405388U CN 201520011638 U CN201520011638 U CN 201520011638U CN 204405388 U CN204405388 U CN 204405388U
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China
Prior art keywords
tube
draw
ring
harvester
collecting pipe
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Expired - Fee Related
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CN201520011638.5U
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Chinese (zh)
Inventor
郑永红
张治国
姚多喜
胡友彪
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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Abstract

The utility model relates to a kind of adjustable-depth soil carbon dioxide harvester, described harvester comprises accumulator unit, coupling arrangement, retractor device and gas cell device from top to bottom successively, described accumulator unit comprises chamber cover, described chamber cover top is provided with the fixing air collecting pipe of regular length, be provided with the draw-tube that length can be stretched in fixing air collecting pipe upper end, lock sleeve by draw-tube fixing and locking on fixing air collecting pipe; Draw-tube arranges two and leads to adapter, two lead to Spherical Seals valve adapter being provided with and controlling it and open and close, and two lead to adapter lower end connects draw-tube, and upper end connects gas bomb.Described harvester, arranges the draw-tube of vary in length, realizes depth adjustment, improves the applicability of harvester, improves estimation precision.Site work in the wild, read relevant readings, its precision more accurately and reliably, and includes depth of soil in CO 2the rate of release of gas and soil release CO 2flux Consideration, science more.

Description

A kind of adjustable-depth soil carbon dioxide harvester
Technical field
The utility model relates to a kind of adjustable-depth soil carbon dioxide harvester, belongs to gaseous sample acquisition technique field.
Background technology
Soil CO 2release be the important component part of Terrestrial Ecosystem Carbon Cycle.Global soil is a huge carbon storehouse, and its carbon reserves are about 1500Pg, is land vehicles and air 2 times and 3 times respectively.According to estimates, global soil, every year to air release carbon 68 ~ 77Pg/a, is more than 10 times of fossil fuel discharge carbon amounts.Soil CO 2even if release occur less change also can equal or exceed the CO entering air due to land use change and (or) combustion of fossil fuel 2year input quantity.
Global climate change, particularly because the climate warming that greenhouse gases cause has received global extensive concern.Just because of the activity of the mankind, comprise the destruction to soil, cause CO 2the change of flux, mankind's activity is CO in air 2concentration sharply rises and the major reason of global warming.
CO 2the characteristic transmitted in this porous medium of soil makes accurately to measure soil CO 2flux is very difficult.CO 2transmission only under the condition that there is concentration gradient (diffusion) and pressure gradient (mass rate) just occur.At present, the most frequently used soil CO under laboratory and field condition 2the acquisition method of gas has dynamic air chamber method, static gas method, vapor-phase chromatography etc.These soil CO 2gas collection method, exists that countryside portable is poor, instrument cost is worth high limitation, is particularly only limitted to the release gathering surface soil and vegetation gas, can not gathers and observe soil different depth place soil CO 2air release feature, is also not easy to calculate soil CO 2rate of gas release and flux.
Chinese patent CN201310275313.3 and CN201320388370.8 discloses a kind of for different depth soil carbon dioxide gas collecting device, and this device has the features such as portability is strong, cost is low.But also there is following defect in it:
1, the air collecting pipe in this device is regular length, the different depth gathered as required in this art solutions selects the air collecting pipe of appropriate length, but when reality uses, once after the air collecting pipe of selected a certain length, just cannot change, need the air collecting pipe reselecting another appropriate length to install and pre-plugged in soil, then continue to repeat wait one day;
2, different, the depth of soil of soil property is different directly affects soil CO 2air release amount, affects soil CO 2rate of gas release and flux;
3, in this art solutions, in laboratory, gas bomb extracting vacuum is write down now manometric reading P1, but in actual use, when the reading P1 obtained in laboratory and field work, data have certain error, this is not only limited to the impact such as sea level elevation, temperature in field, be likely also that leakage factor occurs in intermediate transportation vibration etc., the reading P1 therefore obtained in laboratory is coarse.
Utility model content
The utility model for the deficiency that prior art exists, provides a kind of adjustable-depth soil carbon dioxide harvester just.
For solving the problem, technical solution adopted in the utility model is as follows:
A kind of adjustable-depth soil carbon dioxide harvester, described harvester comprises accumulator unit, coupling arrangement, retractor device and gas cell device from top to bottom successively, described accumulator unit comprises: spherical gas bomb, gas bomb is provided with for evacuated exhaust tube and for CO 2the rubber seal plug of eudiometry, be provided with in gas bomb lower channel for gas drying drying agent and control the sealed valve that lower end gas enters gas bomb, gas bomb top is provided with thermometer and pressure vacuum gauge, described harvester also comprises hemispheric chamber cover, described chamber cover top is provided with the fixing air collecting pipe of regular length, be provided with the draw-tube that length can be stretched in fixing air collecting pipe upper end, lock sleeve is inner at fixing air collecting pipe by draw-tube fixing and locking; Draw-tube arranges two and leads to adapter, two lead to Spherical Seals valve adapter being provided with and controlling it and open and close, and two lead to adapter lower end connects draw-tube, and upper end connects gas bomb.
As the improvement of technique scheme, described fixing air collecting pipe port upper end is provided with resilient ring, at resilient ring outside suit lock sleeve, and lock sleeve extruding elasticity of compression ring and the inner draw-tube installed thereof.
As the improvement of technique scheme, described resilient ring comprises ring body, the lock ring center pit holding draw-tube is provided with in ring body centre, opening sheet and the open slot of the distribution of some even circumferentials is provided with in ring body upper end, and opening sheet and open slot spaced apart, in ring body upper end, outer wall is provided with lock ring inclined-plane, is provided with external thread at ring body lower end outer wall.
As the improvement of technique scheme, described lock sleeve comprises body, and body is hollow structure, and its inside is provided with for holding the upper impression of resilient ring and being used for holding the lower impressions of fixing air collecting pipe; Described upper impression inwall is provided with interior inclined-plane and internal thread; Described interior inclined-plane coordinates with lock ring inclined-plane, and described internal thread coordinates with external thread.
As the improvement of technique scheme, described fixing air collecting pipe port part is provided with the O-ring seal of compressive state.
As the improvement of technique scheme, described draw-tube is also provided with the graduated scale that can read spacing between draw-tube top and chamber cover.
As the improvement of technique scheme, be provided with the rubber ring directly contacted with soil bottom in chamber cover.
Compared with prior art, implementation result of the present utility model is as follows for the utility model:
Harvester described in the utility model, arranges the draw-tube of vary in length, realizes depth adjustment, improves the applicability of harvester, improves estimation precision.In addition, site work in the wild, read relevant readings, its precision more accurately and reliably, and includes depth of soil in CO 2the rate of release of gas and soil release CO 2flux Consideration, science more.
Accompanying drawing explanation
Fig. 1 is harvester structural representation (draw-tube is not opened) described in the utility model;
Fig. 2 is harvester structural representation (draw-tube is opened) described in the utility model;
Fig. 3 is fixing air collecting pipe described in the utility model and draw-tube mounting structure schematic diagram;
Fig. 4 is the I place partial enlarged drawing in Fig. 3;
Fig. 5 is resilient ring front view described in the utility model;
Fig. 6 is the vertical view of Fig. 5;
Fig. 7 is locking sleeve structure schematic diagram described in the utility model;
In figure:
1-gas bomb, 2-exhaust tube, 3-thermometer, 4-pressure vacuum gauge, 5-rubber seal plug, 6-drying agent, 7-sealed valve, 8-two leads to adapter, 9-Spherical Seals valve, 10-fixes air collecting pipe, 11-chamber cover, 12-rubber ring, 13-draw-tube, 14-lock sleeve, 141-body, 142-upper impression, 143-lower impressions, inclined-plane in 144-, 145-internal thread, 15-O-ring seal, 16-graduated scale, 17-resilient ring, 171-ring body, 172-lock ring center pit, 173-opening sheet, 174-open slot, 175-lock ring inclined-plane, 176-external thread.
Embodiment
Below in conjunction with specific embodiments content of the present utility model is described.
As depicted in figs. 1 and 2, harvester described in the utility model comprises accumulator unit, coupling arrangement, retractor device and gas cell device from top to bottom successively, described accumulator unit comprises: the spherical gas bomb 1 of glass, gas bomb 1 is provided with for evacuated exhaust tube 2 and for CO 2the rubber seal plug 5 of eudiometry, be provided with in gas bomb 1 lower channel for gas drying drying agent 6 and control the sealed valve 7 that lower end gas enters gas bomb 1.Gas bomb 1 top is provided with thermometer 3 and pressure vacuum gauge 4, and thermometer 3 is for measuring gas temperature in gas bomb 1, and pressure vacuum gauge 4 is used for measuring pressure in gas bomb 1.
Gas cell device described in the utility model comprises hemispheric chamber cover 11, the fixing air collecting pipe 10 of regular length is provided with on chamber cover 11 top, the draw-tube 13 that length can be stretched is provided with in fixing air collecting pipe 10 inside, draw-tube 13 can stretch up and down in fixing air collecting pipe 10 inside, draw-tube 13 fixing and locking on fixing air collecting pipe 10, is prevented its length variations by lock sleeve 14.Draw-tube 13 arranges two lead to adapter 8, two and lead in adapter 8 and be provided with Spherical Seals valve 9, Spherical Seals valve 9 controls the open and close that two lead to adapter 8.Two lead to adapter 8 lower end connects draw-tube 13, and upper end connects gas bomb 1.Two lead to adapter about 8 two ends is provided with screw thread, is connected respectively, is convenient to remove and install by screw thread with draw-tube 13 or gas bomb 1.
As shown in Figure 3, be fixing air collecting pipe 10 described in the utility model and draw-tube 13 mounting structure schematic diagram, Fig. 4 is the I place partial enlarged drawing in Fig. 3.The fixing air collecting pipe 10 that draw-tube 13 is arranged on hollow is inner, and fixing air collecting pipe 10 port part is located at the O-ring seal 15 of compressive state, prevents the leakage between draw-tube 13 and fixing air collecting pipe 10.Resilient ring 17 is also provided with in fixing air collecting pipe 10 port upper end, at resilient ring 17 outside suit lock sleeve 14, lock sleeve 14 is together with resilient ring 17 threaded engagement, and elasticity of compression ring 17 and the inner draw-tube 13 installed thereof, draw-tube 13 cannot be moved in fixing air collecting pipe 10, and then realizes being locked of draw-tube 13.
As shown in Figure 5, be resilient ring 17 front view described in the utility model, Fig. 6 is the vertical view of Fig. 5.Resilient ring 17 described in the utility model comprises ring body 171, the lock ring center pit 172 holding draw-tube 13 is provided with in ring body 171 centre, opening sheet 173 and the open slot 174 of the distribution of some even circumferentials is provided with in ring body 171 upper end, and opening sheet 173 and open slot 174 spaced apart, allow opening sheet 173 have certain elasticity like this.In ring body 171 upper end, outer wall is provided with lock ring inclined-plane 175, is provided with external thread 176 at ring body 171 lower end outer wall.
As shown in Figure 7, be lock sleeve 14 structural representation described in the utility model.Lock sleeve 14 described in the utility model comprises body 141, and body 141 is hollow structure, and its inside is provided with upper impression 142, lower impressions 143.Upper impression 142 is used for holding resilient ring 17, and lower impressions 143 is used for holding fixing air collecting pipe 10.Described upper impression inwall is provided with interior inclined-plane 144 and internal thread 145, and interior inclined-plane 144 coordinates with lock ring inclined-plane 175, and internal thread 145 coordinates with external thread 176.
When lock sleeve 14 described in the utility model coordinates with resilient ring 17, be rotated down lock sleeve 14, first internal thread 145 and external thread 176 mesh together, now interior inclined-plane 144 is on lock ring inclined-plane 175, when lock sleeve 14 continues to move downward, interior inclined-plane 144 extrudes lock ring inclined-plane 175 gradually, forces opening sheet 173 to be drawn close to center, and then extrude the draw-tube 13 be arranged in the middle part of resilient ring 17, finally allow draw-tube 13 install and be locked on fixing air collecting pipe 10.When needed, reverse rotation lock sleeve 14, opening sheet 173 is gradually away from draw-tube 13, and such draw-tube 13 again can be mobile in fixing air collecting pipe 10 inside.
Harvester described in the utility model, draw-tube 13 is provided with graduated scale 16, the spacing between draw-tube 13 top and chamber cover 11 can be read by graduated scale 16, and this spacing can regulate arbitrarily according to actual needs, be conducive to the height that operating personnel control harvester like this, be beneficial to CO 2gas collecting.So not only be convenient to Rapid reading, and be convenient to manual operation.In addition, the different and objective reality situation according to the soil property of soil, the spacing between general draw-tube 13 top and chamber cover 11 controls within the scope of 1.2 meters.The degree of depth is too large, CO in soil 2gas change is little, and root system of plant is generally also difficult to reach less than 1.2 meters soil layers, measures its CO 2gas content actual use meaning is also little.
Harvester described in the utility model, is provided with rubber ring 12 bottom in chamber cover 11, and rubber ring 12 directly contacts with soil; improve the sealing of harvester on the one hand; on the other hand chamber cover 11 is played a protective role, improve its serviceable life, prevent micro-crack equivalent damage.
Harvester described in the utility model, draw-tube 13 can oscilaltion in fixing air collecting pipe 10, adjustable-height is larger, in order to improve the convenience of this harvester, harvester can be disassembled into the first half and the latter half, together, draw-tube less than 13 sections fit together for draw-tube more than 13 sections fit, so not only easy for installation, and handling safety.
Harvester described in the utility model, chamber cover 11, fixing air collecting pipe 10 can adopt the hard material such as stainless steel to make, and draw-tube 13, lock sleeve 14, resilient ring 17 can adopt plastic material to make, and improve its safety in utilization, structure is reliable, and long service life.
Utilize harvester described in the utility model, can complete different depth CO such as forest, mountain region, grassland and artificial reconstruction's soil 2the collection of gas.Its using method is as follows:
Step one: scene vacuumizes;
First, in collecting region, before vacuumizing, close sealed valve 7, exhaust tube 2 is communicated with vacuum pump, open the valve on exhaust tube 2, gaseous tension in gas bomb 1 is extracted into below-0.08Mpa, shut the valve on exhaust tube 2, write down the reading P1 of pressure vacuum gauge 4 now, the effect of reading P1 is mainly used to judge impermeability;
Step 2: leak check;
Every 1min, read the reading of pressure vacuum gauge 4, and compare with reading P1, if double reading and P1 gap are less than 5%, then record temperature t1 in last reading P2 and gas bomb 1;
Step 3: install and regulate height;
Complete draw-tube 13 and fixing air collecting pipe 10 is installed, draw-tube 13 is locked on fixing air collecting pipe 10 by lock sleeve 14, regulate draw-tube 13 length according to actual needs, read draw-tube 13 high scale h1, two lead to junction, adapter about 8 two ends scribbles seal glass glue, connect air chamber and gas bomb, complete the installation of harvester; Between installation period, if P1 reading difference in change is apart from being greater than 5%, then repeats step one and step 2, reinstall harvester and vacuumize, if P1 reading difference in change is apart from being less than 5%, then carrying out step 4;
Step 4: collect CO 2gas;
By pre-buried for harvester more than 24h, allow soil bury above chamber cover 11 and fixed sample pipe 10 junction, period reduces human activity as far as possible to soil disturbance, makes harvester fully collect CO 2gas, when reaching the required gas collecting time, opens sealed valve 7 and Spherical Seals valve 9, allows CO 2gas fully enters in gas bomb 1, after pressure vacuum gauge 4 stable reading, reads gas temperature t2 in the reading P3 of pressure vacuum gauge 4 and gas bomb 1, then closes sealed valve 7 and spherical sealed valve 9;
Step 5: scale merit state down-sampling volume Vn;
Its standard state down-sampling volume Vn gas below calculates formulae discovery:
Vn = ( P 3 - P 2 ) × V × 273 Ps × ( 273 + t )
In formula:
Vn-standard state down-sampling volume, L;
Pressure before P2-steady state (SS) down-sampling, Kpa;
Pressure after P3-steady state (SS) down-sampling, Kpa;
Ps-standard atmospheric pressure, Kpa;
Medial temperature in t-gas bomb, DEG C, convert by t2 and t1 and draw;
V-gas bomb volume, L.
Can find out from formula, standard state down-sampling volume Vn is only relevant with standard atmospheric pressure Ps with medial temperature t in gauge pressure P2, P3 before and after steady state (SS) down-sampling and gas bomb, and has nothing to do with sampling time, ambient atmosphere pressure.But in fact sampling time, ambient atmosphere pressure directly affect CO 2gas concentration and rate of release thereof, this can affect CO 2the precision of gasmetry.
Step 6: estimation soil release CO 2flux;
Complete soil CO 2after gas collecting, gas bomb 1 is taken back laboratory, syringe can be utilized to be shaken up in NaOH or KOH solution injection gas bomb 1 by rubber plug 5, with rare HCl titration NaOH or KOH after end to be absorbed, and then calculate the CO in aqueous slkali absorbing agent 2total amount.
Or, extract CO in gas bomb 1 with syringe by rubber plug 5 2gaseous sample, then syringe is inserted in gas chromatography or infrared gas analyzer injection port, analyze its CO 2gas concentration.
According to soil CO 2the soil erosion of gas concentration, acquisition time, acquired volume, chamber cover 11 contact and draw-tube 13 high scale scale h1, and then extrapolate soil CO 2the rate of release of gas, estimates soil release CO 2flux.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.

Claims (7)

1. an adjustable-depth soil carbon dioxide harvester, described harvester comprises accumulator unit, coupling arrangement, retractor device and gas cell device from top to bottom successively, described accumulator unit comprises: spherical gas bomb (1), gas bomb (1) is provided with for evacuated exhaust tube (2) and for CO 2the rubber seal plug (5) of eudiometry, be provided with in gas bomb (1) lower channel for gas drying drying agent (6) and control the sealed valve (7) that lower end gas enters gas bomb (1), thermometer (3) and pressure vacuum gauge (4) is provided with on gas bomb (1) top, described harvester also comprises hemispheric chamber cover (11), it is characterized in that, described chamber cover (11) top is provided with the fixing air collecting pipe (10) of regular length, the draw-tube (13) that length can be stretched is provided with in fixing air collecting pipe (10) upper end, lock sleeve (14) is inner at fixing air collecting pipe (10) by draw-tube (13) fixing and locking, draw-tube (13) arranges two and leads to adapter (8), two lead to the Spherical Seals valve (9) adapter (8) being provided with and controlling it and open and close, two lead to adapter (8) lower end connects draw-tube (13), and upper end connects gas bomb (1).
2. a kind of adjustable-depth soil carbon dioxide harvester according to claim 1, it is characterized in that, described fixing air collecting pipe (10) port upper end is provided with resilient ring (17), at resilient ring (17) outside suit lock sleeve (14), lock sleeve (14) extruding elasticity of compression ring (17) and the inner draw-tube (13) installed thereof.
3. a kind of adjustable-depth soil carbon dioxide harvester according to claim 2, it is characterized in that, described resilient ring (17) comprises ring body (171), the lock ring center pit (172) holding draw-tube (13) is provided with in ring body (171) centre, opening sheet (173) and the open slot (174) of the distribution of some even circumferentials is provided with in ring body (171) upper end, and opening sheet (173) and open slot (174) spaced apart, in ring body (171) upper end, outer wall is provided with lock ring inclined-plane (175), external thread (176) is provided with at ring body (171) lower end outer wall.
4. a kind of adjustable-depth soil carbon dioxide harvester according to claim 3, it is characterized in that, described lock sleeve (14) comprises body (141), body (141) is hollow structure, and its inside is provided with for holding the upper impression (142) of resilient ring (17) and being used for holding the lower impressions (143) of fixing air collecting pipe (10); Described upper impression (142) inwall is provided with interior inclined-plane (144) and internal thread (145); Described interior inclined-plane (144) coordinates with lock ring inclined-plane (175), and described internal thread (145) coordinates with external thread (176).
5., according to described a kind of adjustable-depth soil carbon dioxide harvester arbitrary in Claims 1 to 4, it is characterized in that, described fixing air collecting pipe (10) port part is provided with the O-ring seal (15) of compressive state.
6. according to described a kind of adjustable-depth soil carbon dioxide harvester arbitrary in Claims 1 to 4, it is characterized in that, described draw-tube (13) is also provided with the graduated scale (16) that can read spacing between draw-tube (13) top and chamber cover (11).
7., according to described a kind of adjustable-depth soil carbon dioxide harvester arbitrary in Claims 1 to 4, it is characterized in that, be provided with the rubber ring (12) directly contacted with soil in chamber cover (11) bottom.
CN201520011638.5U 2015-01-08 2015-01-08 A kind of adjustable-depth soil carbon dioxide harvester Expired - Fee Related CN204405388U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104502163A (en) * 2015-01-08 2015-04-08 安徽理工大学 Adjustable-depth collecting device for carbon dioxide in soil and use method of adjustable-depth collecting device
CN109669010A (en) * 2018-12-29 2019-04-23 江苏大学 A kind of Tidal Wetland Soils Carbon flux measurement pedestal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104502163A (en) * 2015-01-08 2015-04-08 安徽理工大学 Adjustable-depth collecting device for carbon dioxide in soil and use method of adjustable-depth collecting device
CN109669010A (en) * 2018-12-29 2019-04-23 江苏大学 A kind of Tidal Wetland Soils Carbon flux measurement pedestal

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Granted publication date: 20150617

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