CN102607902A - Sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil - Google Patents
Sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil Download PDFInfo
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- CN102607902A CN102607902A CN2011100235215A CN201110023521A CN102607902A CN 102607902 A CN102607902 A CN 102607902A CN 2011100235215 A CN2011100235215 A CN 2011100235215A CN 201110023521 A CN201110023521 A CN 201110023521A CN 102607902 A CN102607902 A CN 102607902A
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Abstract
The invention provides a sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil, belonging to oil/gas exploration field in petroleum geology. The canister includes a canister body, an end cover, and a piston mobile degassing assembly. The end cover is detachably fixed at one end of the canister body. The piston mobile degassing assembly is fixed at the other end of the canister body, and used for changing volume of the sealed canister to realize interior gas pressure rise/fall, thereby realizing the objective of desorbing physically-adsorbed gas in soil sample in the canister and pumping gas under positive pressure. The canister provided by the invention is used to extract physically-adsorbed hydrocarbon in soil sample in manner of total sealing, vacuum degassing by moving piston, and pumping under positive pressure; and has the advantages of high sealability and degassing degree, simple operation, convenient carriage, suitability for batch sample test, shortened sample analysis time and period, and improved efficiency. Meanwhile, cylinder of the canister is marked with volumetric scale, to realize direct and quantitative sampling in the field, avoid sample gas loss due to secondary operation, and guarantee consistent sample size.
Description
Technical field
The invention belongs to the petroleum exploration domain in the oil geology, be specifically related to a kind of soil physics adsorbed hydrocarbons vacuum desorption sealable tank.
Background technology
The degassing technology that is applied to the physisorption gas of geochemical prospecting at present mainly is through vacuumizing and being aided with heating technique the gas desorption that is adsorbed in solid particles surface to be discharged in the container; Generally be in the laboratory; The container at prior isolation experiment sample place; Take out the gas in the experimental provision with vacuum pump, and then be communicated with the container of containing sample, thereby cause condition of negative pressure to make the adsorbed gas desorb.
Lighter hydrocarbons in the hydrocarbon-bearing pool can with the faint but amount near normal that can detect leak in the surface soil, this is the theoretical foundation of oil and gas geochemical exploration.In the soil of near surface, because the adding of vertical little seepage hydrocarbon, the result has formed the peripheral background hydrocarbon of the hydrocarbon-bearing pool concentration that compares and has wanted high hydrocarbon anomaly above hydrocarbon-bearing pool.The abnormality mark that utilizes the migration hydrocarbon to stay on the face of land can predictably descend oil-gas bearing prospect.Because activity attitude hydro carbons (physisorption hydrocarbon) is the direct indicator that reflects whether hydrocarbon-bearing pool now exist, and therefore in oil and gas geochemical exploration, has obtained paying attention to widely and using.Current method for extraction soil physics adsorbed hydrocarbons mainly contains sealing saline bottle headroom gas technology and physisorption gas technology.
Wherein, Headroom gas technology is to be sealed in sample in the bottle; A part of space is stayed on top, leaves standstill or after a period of time of vibrating lets the adsorbed lighter hydrocarbons of sample under corresponding states, reach absorption and desorb balance with headspace air, gets a certain amount of headspace gas and carry out gas chromatographic analysis.This technological device is as shown in Figure 1, and wherein, 1-1 is a sealing rubber plug, and 1-2 is a saturated brine, and 1-3 is a pedotheque, and 1-4 is the glass saline bottle, gas between the head space that 1-5 goes out for the soil balance.
Physisorption gas extractive technique is that a kind of sample bottle, degasser of comprising is the soil physics adsorbed hydrocarbons extraction element of one.Weigh fetching earth earth or chip sample (or amount volume) be placed in the special sample bottle and seal; Add saturated brine and drain air; Cause the vacuum of inner certain vacuum degree through degasser as shown in Figure 2; Physical action attitude lighter hydrocarbons in the sample are more fully taken off, manage to collect the body that outgases again, get part with gas chromatograph qualitative and quantitative analysis C1-C7 light hydrocarbon component wherein.In the degasser shown in Figure 2,2-1 is a water cup, and 2-2 is a valve 1, and 2-3 is a valve 2, and 2-4 is a vacuum pump; 2-5 is a valve 3, and 2-6 is a vacuum meter, and 2-7 is a valve 4, and 2-8 is a freeing port, and 2-9 is a water storage bottle; 2-10 is degassing bottle, and 2-11 is a screen pack, and 2-12 is gas collection and gas production mouth, and 2-13 is notes, drainpipe.
But there are following problem in headroom gas technology and physisorption gas technology:
1, headroom gas technology is a kind of relative quantitative analysis, and the part physisorption attitude lighter hydrocarbons of separating sucking-off are diluted by headroom gas on the one hand; On the other hand; In sampling, desorb and analytic process, receive environment temperature and pressure influence bigger; It is also bigger influenced by lithology; And sometimes in the headroom content of lighter hydrocarbons not linear with the volume or weight of sample, also can't be converted into lighter hydrocarbons amount contained in unit volume or the unit weight sample.The part hydrocarbon gas of particle surface receives the effect of Van der Waals force not have complete desorb in addition.
2; Though physisorption gas technology has overcome some shortcomings of headroom gas technology; Adopted the inner method of making vacuum, avoided air influence, and can more fully come out physisorption lighter hydrocarbons dose; Thereby make the content of correspondence position unit weight (or unit volume) sample physisorption lighter hydrocarbons high than the lighter hydrocarbons content in the headroom, the light hydrocarbon component that is extracted is many.But the saturated brine of this treating apparatus (as shown in Figure 2) in taking out sample bottle must have a part of dissolved hydrocarbon and the free hydrocarbon that desorbs in the process of water storage bottle, cause hydrocarbon content loss to a certain degree in the sample.In addition, this degasser is more loaded down with trivial details, when sample number more for a long time, accomplish analytical test at short notice, need to set up many cover degassers, the time of labor, man power and materials.
Through retrieving State Intellectual Property Office's net, tieing up databases such as general data network (periodical), European patent storehouse, United States Patent (USP) storehouse, detect following relevant prior art:
1, the patent No. is that the patent of CN1308678C discloses a kind of soil adsorbed hydrocarbon low-temperature desorption apparatus and method, and its shortcoming is: (1) high temperature, negative pressure act on simultaneously, and degasifying effect is good, but have simultaneously in the water vapour entrained gas, have increased analytical error; (2) sample multi-pass operations can cause gas loss, causes personal error; (3) operation of equipment is complicated, is applicable to the analysis experiment of small amount of sample under the laboratory condition.
2, the patent No. is that the patent of CN101051007A discloses a kind of device that is used for preparing or collecting the rock adsorptive gaseous hydrocarbon, and its characteristics are: (1) closed-loop operation not disturbed by air, but sample still needs secondary operation; (2) mechanical raking, heating, the acidolysis degassing, degassing degree is high; (3) deviate from gas and collect fully, effectively avoid the device residual gas and the analytical error that causes; (4) install complicated operation, be only applicable to the experiment of small amount of sample under the laboratory condition; (5) mainly be applicable to the acidolysis degassing.
3, the patent No. is that the patent of CN201105820Y discloses a kind of anti-skidding visual sealable tank, and it is characterized in that: (1) is anticorrosion, can avoid the not shortcoming of suitable long-term storage corrosive corporation of glass and plastic material; (2) anti-skidding, tank body adopts the design of anti-skidding raised line or protruding grain; (3) visual, the cover upper surface adopts visual material to process, and can observe a jar interior article situation; (4) sealing, cover and tank body adopt screw thread revolve with or pressing seal; (5) satisfied beautifying with daily life used.
4, the patent No. is that the patent of CN101034050 discloses a kind of fast desorption meter for gas content of goal seam, mainly comprises sealable tank and stirs piece two parts.It is characterized in that: (1) sealable tank is a container of placing coal core article, and built-in stirring piece; (2) stir piece and play mechanical raking coal core article, and the adsorbed gas of coal in-core is discharged; (3) device is simple, and a jar internal gas pressure can not change and be higher, be unfavorable for the degassing, so the degree of mechanical raking desorb physisorption gas is lower.
5, the patent No. is that the patent of JP57165007 (A) discloses Method and apparatus fordegassing dissolved gas in liquid, and it mainly is made up of seal box and tygon-tetrafluoride pitch tube.It is characterized in that: (1) seal box is pumped into vacuum, and a long resin pipe is coiled into the bamboo raft shape and is built in the seal box; (2) liquid is injected by pitch tube one end, discharges from an other end; (3) under the effect of pitch tube inside and outside differential pressure, dissolved gases can ooze out through the resin tube wall in the fluid, gets in the seal box.Mainly be applicable to the dissolved gas that desorb is inflammable and low-boiling point liquid is interior.
6, the patent No. is that the patent of US2010/0078435A1 discloses Seal jar1. core technology for a tank body is separated into a plurality of confined spaces, can place different article respectively, has solved the problem of using a plurality of tank bodies to take too many space.It is characterized in that: (1) Sealing Technology adopts O-ring seal to be close to the method for inner tank wall; (2) sealing property is general, is applicable to that it is not very high daily use that sealing property is required.
In a word, have various problems in the prior art, they or the low perhaps operation of desorb degree be complicacy comparatively, only is adapted at the degassing experiment of the small amount of sample under the laboratory condition.
Summary of the invention
The objective of the invention is to solve a difficult problem that exists in the above-mentioned prior art; A kind of soil physics adsorbed hydrocarbons vacuum desorption sealable tank is provided; Extract physisorption hydrocarbon in the pedotheque through hermetically sealed, piston vacuum outgas mode; The sealing jar integrates sample sealing, negative pressure degasification and malleation bleeds, and installs small and exquisitely, simple to operate and convenient and practical, is fit to the gas desorption experiment of sample in batches simultaneously.
The present invention realizes through following technical scheme:
A kind of soil physics adsorbed hydrocarbons vacuum desorption sealable tank, said sealable tank comprises that cylindrical shell 5, end cap 2 and piston move degassing assembly;
Wherein, said cylindrical shell 5 is the tube-in-tube structure of both ends open, and the one of which end is the sample introduction end, is used to put into sample, and the other end is the working end, is used for fixing said piston and moves degassing assembly;
Said end cap 2 is detachable to be installed on the sample introduction end of cylindrical shell 5, and the inner chamber of cylindrical shell 5 is sealed; During the dress sample, open end cap 2, the sample bonnet upper end cover 2 of in cylindrical shell 5, packing into.
Said piston moves degassing assembly and comprises end cap nut 12, piston 6 and rotary sleeve 16;
One end of said end cap nut 12 is fixed on the working end of cylindrical shell 5; The other end is sleeved in the endoporus of said rotary sleeve 16;
Said piston 6 is installed in the inner chamber of said cylindrical shell 5, and it is coaxial with cylindrical shell 5, and in the inner chamber of cylindrical shell 5, moves; On the end face of the piston 6 of end cap nut 12, be fixed with piston rod 19, the other end traversing through end box nut 12 of piston rod 19 becomes free end;
On the free-ended outside surface of said piston rod 19, thrust bearing 17 is housed, thrust bearing 17 is fixed with baffle ring 18 through the axle that is installed on piston rod 19 outside surfaces; On outside surface, be set with pad 9 near the piston rod 19 at piston 6 places;
On the outside surface of the piston rod 19 between pad 9 and the thrust bearing 17, be set with hollow screw mandrel 10; The two ends of said hollow screw mandrel 10 withstand on respectively on pad 9 and the thrust bearing 17, and between the two for movingly; Hollow screw mandrel 10 has external thread, matches with the internal thread of end cap nut 12;
In the endoporus of said rotary sleeve 16, be fixed with coupling sleeve 20; On the endoporus face of cylinder of said coupling sleeve 20, be fixed with and said hollow screw mandrel 10 homoaxial keys 21; Have axial long recess on the outside surface of said hollow screw mandrel 10, the slippage in axial long recess of said key 21, key 21 plays the effect that drives hollow screw mandrel 10 rotations
Rotation rotary sleeve 16; Rotary sleeve 16 drives coupling sleeve 20 and rotates together; Drive hollow screw mandrel 10 rotations through key 21 again, because the external thread and fixed end caps nut 12 screw-internal thread fit of hollow screw mandrel 10, hollow screw mandrel 10 moves axially simultaneously; Promote thrust bearing 17 and axle with baffle ring 18 or pad 9 and then drive piston rod 19 and axially move, move axially by piston rod 19 drive pistons 6 again with hollow screw mandrel 10.
Have the aspirating hole of perforation at the center of said end cap 2; Air extracting seal pad 3 and contact pin pressure cap 1 from inside to outside are housed in said aspirating hole successively;
Center at said contact pin pressure cap 1 has through hole;
Said aspirating hole has one section internal thread; Said contact pin pressure cap 1 has external thread, and the internal thread of aspirating hole matches on the external thread of contact pin pressure cap 1 and the end cap 2.Rotation contact pin pressure cap 1 can let contact pin pressure cap 1 get into aspirating hole, plays the effect that compresses air extracting seal pad 3, and rotation contact pin pressure cap 1 also can be regulated the sealing property of control air extracting seal pad 3.During use; With the central through hole insertion air extracting seal pad 3 of chromatogram sample introduction needle through contact pin pressure cap 1; Air extracting seal pad 3 is used in chromatogram sample introduction needle insertion process sample introduction needle being sealed, in case cylindrical shell 5 interior gases are overflowed or cylindrical shell 5 outer air get into, like this; Both can guarantee sealing, and easily extract interior gas (liquid) body of tube again and carry out related experiment.
The inside surface of end cap 2 is designed to sphere or inclined-plane, is end cap 2 the thinnest place at the shaft centre line place.
With the end cap 2 of said cylindrical shell 5 inwall contact positions on groove in end cap O type circle 4 is housed, the inner chamber through 4 pairs of cylindrical shells 5 of O shape circle carries out port sealing.In the groove of the external cylindrical surface of said piston 6, piston O type circle 7 is housed, is used for the sealing between piston 6 and cylindrical shell 5 inside surfaces.
Cooperating between the outside surface of piston rod 19 and pad 9, the hollow screw mandrel 10 for movingly;
First annular ring of said thrust bearing 17 contacts with the end face of said hollow screw mandrel 10, and second annular ring contacts with the medial surface of axle with baffle ring 18; It between two annular rings rolling steel balls;
The interior circle of first annular ring cooperates for movingly with the outside surface of piston rod 19, and the interior circle of second annular ring is a transition fit with cooperating of the outside surface of piston rod 19, is convenient to promote the mounting or dismounting of bearing like this; Its effect is when hollow screw mandrel 10 positive and negative rotations, and first annular ring of thrust bearing 17 and steel ball be with hollow screw mandrel 10 positive and negative rotations, plays to reduce friction and the effect of bearing the axial force that hollow screw mandrel 10 produced in moving axially process.Axle is that limit thrust bearing 17 is moved on piston rod with the effect of baffle ring 18;
With the outer cylinder surface of the said end cap nut 12 in said rotary sleeve 16 contact positions on have coaxial annular groove;
On said rotary sleeve 16, be fixed with stop screw 13, said stop screw 13 passes the inner periphery of said rotary sleeve 16;
The no thread end of said stop screw 13 is sleeved in the spacing guide 14, and stop screw 13 is rotatably assorted with said spacing guide 14; Annular groove on the outside surface of spacing guide 14 and the end cap nut 12 movingly, spacing guide 14 slides in annular groove.It mainly acts on and plays restriction rotary sleeve-16 does not break away from end cap nut-12 in doing positive and negative rotary course the face of cylinder, that is to say that placing restrictions on rotary sleeve-16 can only do positive and negative rotation, and can not move by straight line.
Said coupling sleeve 20 is fixedly connected with rotary sleeve 16 through sunk screw 15.
Said end cap 2 is connected with cylindrical shell 5 through nut pin 22; Said end cap nut 12 is fixedly connected with cylindrical shell 5 through dormant bolt 11.
Outside surface at said cylindrical shell 5 is marked with the volume scale, can sample be quantized.
Said cylindrical shell 5 is processed by organic glass, can place pedotheque and saturated brine in the cylindrical shell 5.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention integrates sample sealing, negative pressure degasification and malleation and bleeds, and install small and exquisite, be convenient for carrying, simple to operate and convenient and practical;
(2) sealing jar good leak tightness is applicable to that the analysis experiment that leakproofness is had relatively high expectations uses, and have quantitative sample volume, negative pressure degasification and degasifying effect are good fast, and can use repeatedly;
(3) cylindrical shell of sealing jar indicates the volume scale, can direct quantitative when packing sample in the open air into sampling, avoid secondary operation and the sample gas loss that causes, also can guarantee the sample size basically identical simultaneously;
(4) utilize the sealing jar, mobile piston can change the barrel spatial volume, and realization quick negative pressure degasification of pedotheque and malleation are bled; Avoided the artificial loss of hydro carbons in the pedotheque; Easy and simple to handle, adopt the same one jar, simultaneously the process mass sample; Shorten sample analysis time and cycle, improved efficient;
(5) the present invention is applicable to the sealed vacuum degassing, the malleation extraction of the physisorption hydrocarbon of soil, rock and aqueous medium sample.The scope of application comprises surface oil and gas geochemical prospecting, oil and gas geochemistry well logging, mineral exploration and environmental surveys etc., has a extensive future.
Description of drawings
Fig. 1 is the synoptic diagram of prior art headroom gas technology equipment therefor.
Fig. 2 is the synoptic diagram of prior art physisorption gas technology equipment therefor.
Fig. 3 is the structural drawing of soil physics adsorbed hydrocarbons vacuum desorption sealable tank of the present invention.
Wherein, contact pin pressure cap 1, end cap 2, air extracting seal pad 3, end cap O type circle 4, cylindrical shell 5, piston 6, piston O type circle 7, straight pin 8, pad 9, hollow screw mandrel 10, dormant bolt 11, end cap nut 12, stop screw 13, spacing guide 14, sunk screw 15, rotary sleeve 16, thrust bearing 17, axle are with baffle ring 18, piston rod 19, coupling sleeve 20, key 21 and bolt pin 22.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
A kind of soil physics adsorbed hydrocarbons vacuum desorption sealable tank, as shown in Figure 3, said sealable tank comprises that cylindrical shell 5, end cap 2 and piston move degassing assembly;
Wherein, said cylindrical shell 5 is the tube-in-tube structure of both ends open, and the one of which end is the sample introduction end, is used to put into sample, and the other end is the working end, is used for fixing said piston and moves degassing assembly;
Said end cap 2 is detachable to be installed on the sample introduction end of cylindrical shell 5, and the inner chamber of cylindrical shell 5 is sealed; During the dress sample, open end cap 2, the sample bonnet upper end cover 2 of in cylindrical shell 5, packing into.
Said piston moves degassing assembly and comprises end cap nut 12, piston 6 and rotary sleeve 16; Thereby it is rising and the reduction that the volume that is used to change sealable tank is realized the sealable tank internal gas pressure that said piston moves degassing assembly, reaches to separate the purpose that pedotheque physisorption gas and malleation are bled in the suction tube.
One end of said end cap nut 12 is fixed on the working end of cylindrical shell 5; The other end is sleeved in the endoporus of said rotary sleeve 16; Specifically, shoulder outside on said end cap nut 12, having has interior shoulder on said rotary sleeve 16, and it is sleeved on the outside surface of outer shoulder of said end cap nut 12.
On the free-ended outside surface of said piston rod 19, thrust bearing 17 is housed, thrust bearing 17 is fixed with baffle ring 18 through the axle that is installed on piston rod 19 outside surfaces; On piston rod 19 surfaces, have annular groove, axle is installed in the annular groove of piston rod 19 with baffle ring 18; Said thrust bearing can adopt plane thrust axis etc.On outside surface, be set with pad 9 near the piston rod 19 at piston 6 places; The two ends of said hollow screw mandrel 10 withstand on respectively on pad 9 and the thrust bearing 17, and between the two for movingly.Through thrust bearing 17 piston rod 19 is passed in the power transmission when hollow screw mandrel 10 moves right, driven piston 6 through piston rod 19 with straight pin 8 then and move to right; When being moved to the left, be piston 6 to be passed in the power transmission through pad 9.When the endoporus of hollow screw mandrel 10 in the process of piston rod 19 rotations, second end face that pad 9 plays protection piston 6 to be had is not worn and prevents the effect that piston 6 rotates thereupon.
On the outside surface of the piston rod 19 between pad 9 and the thrust bearing 17, be set with hollow screw mandrel 10; Hollow screw mandrel 10 has external thread, matches with the internal thread of end cap nut 12;
In the endoporus of said rotary sleeve 16, be fixed with coupling sleeve 20; On the endoporus face of cylinder of said coupling sleeve 20, be fixed with and said hollow screw mandrel 10 homoaxial keys 21; Have axial long recess on the outside surface of said hollow screw mandrel 10, the slippage in axial long recess of said key 21, key 21 plays the effect that drives hollow screw mandrel 10 rotations
Have the aspirating hole of perforation at the center of said end cap 2; Air extracting seal pad 3 and contact pin pressure cap 1 from inside to outside are housed in said aspirating hole successively; Among the embodiment, in order to make air accumulation that desorption comes out at container top, being beneficial to and extracting gas appearance, the inside surface of end cap 2 is designed to sphere or inclined-plane, is end cap 2 the thinnest place at the shaft centre line place;
Center at said contact pin pressure cap 1 has through hole;
Said aspirating hole has one section internal thread; Said contact pin pressure cap 1 has external thread, and the internal thread of aspirating hole matches on the external thread of contact pin pressure cap 1 and the end cap 2.Rotation contact pin pressure cap 1 can let contact pin pressure cap 1 get into aspirating hole, plays the effect that compresses air extracting seal pad 3, and rotation contact pin pressure cap 1 also can be regulated the sealing property of control air extracting seal pad 3.During use; With the central through hole insertion air extracting seal pad 3 of chromatogram sample introduction needle through contact pin pressure cap 1; Air extracting seal pad 3 is used in chromatogram sample introduction needle insertion process sample introduction needle being sealed, in case cylindrical shell 5 interior gases are overflowed or cylindrical shell 5 outer air get into, like this; Both can guarantee sealing, and easily extract interior gas (liquid) body of tube again and carry out related experiment.Because of the compounding substances in the tube is three kinds in a sample, water, desorption gas; Wherein the density of desorption gas is minimum, under the duty, when cylindrical shell 5 stands up; Aspirating hole must open that peak is on the shaft centre line on end cap 2 band inclined-planes (or sphere) in tube, concentrates entirely on the saturated brine to guarantee desorption gas.In addition, air extracting seal pad 3 can adopt materials such as silicon rubber, and sample introduction needle is worn out the air extracting seal pad and got into cylindrical shell 5, and the cylindrical shell top is the gas that desorption comes out from soil, and sample introduction needle can be drawn into gas at the tube top.
With the end cap 2 of said cylindrical shell 5 inwall contact positions on outer shoulder groove in end cap O type circle 4 is housed, the inner chamber through 4 pairs of cylindrical shells 5 of O shape circle carries out port sealing, and cylinder lumen is hedged off from the outer world.In the groove of the external cylindrical surface of said piston 6, piston O type circle 7 is housed, is used for the sealing between piston 6 and cylindrical shell 5 inside surfaces.
First annular ring of said thrust bearing 17 contacts with the end face of said hollow screw mandrel 10, and second annular ring contacts with the medial surface of axle with baffle ring 18; It between two annular rings rolling steel balls;
The interior circle of first annular ring cooperates for movingly with the outside surface of piston rod 19, and the interior circle of second annular ring is a transition fit with cooperating of the outside surface of piston rod 19, is convenient to promote the mounting or dismounting of bearing like this; Its effect is when hollow screw mandrel 10 positive and negative rotations, and first annular ring of thrust bearing 17 and steel ball be with hollow screw mandrel 10 positive and negative rotations, plays to reduce friction and the effect of bearing the axial force that hollow screw mandrel 10 produced in moving axially process.Axle is that limit thrust bearing 17 is moved on piston rod with the effect of baffle ring 18;
With the outer cylinder surface of the said end cap nut 12 in said rotary sleeve 16 contact positions on have coaxial annular groove;
On said rotary sleeve 16, be fixed with stop screw 13, said stop screw 13 passes the inner periphery of said rotary sleeve 16;
The no thread end of said stop screw 13 is sleeved in the spacing guide 14, and stop screw 13 is rotatably assorted with said spacing guide 14; Annular groove on the outside surface of spacing guide 14 and the end cap nut 12 movingly, spacing guide 14 slides in annular groove.Its mainly act on play the restriction rotary sleeve 16 in doing positive and negative rotary course, do not break away from the face of cylinder of end cap nut 12, that is to say the restriction rotary sleeve 16 can only do radially positive and negative rotation, move and can not do axial straight line.
Said coupling sleeve 20 is fixedly connected with rotary sleeve 16 through sunk screw 15.
Said end cap 2 is connected with cylindrical shell 5 through nut pin 22; Said end cap nut 12 is fixedly connected with cylindrical shell 5 through dormant bolt 11.
Said cylindrical shell 5 is processed by organic glass, can place pedotheque and saturated brine in the cylindrical shell 5.The outside surface of cylindrical shell 5 chamber walls is marked with the volume scale, can sample be quantized.Organic glass is a transparent synthetic material, and hardness and intensity satisfy the requirement of sealable tank, and the dress sample size is visual, and material is difficult for adsorbs hydrocarbons gas relatively.Saturated brine added before sampling, and dress appearance back saturated brine rises to tank deck, the air in the drain tank.The effect of saturated brine is the air in the drain tank on the one hand, and hydrocarbon gas is insoluble in saturated brine on the other hand, the hydrocarbon gas dissolving of avoiding desorption to come out.After the degassing, gas concentrates on the space, tank top, and sample introduction needle can directly be extracted into gas at the top, need not pass the sampling of soil horizon and water layer.
Principle of work of the present invention is: manually rotate rotary sleeve 16; Rotary sleeve 16 drives coupling sleeve 20 through sunk screw 15 and rotates together; Drive hollow screw mandrel 10 rotations through the key 21 that is fixed on 20 inside surfaces again, because hollow screw mandrel 10 external threads and fixed end caps nut 12 screw-internal thread fit, hollow screw mandrel 10 moves axially simultaneously; Promoting thrust bearing 17 and axle axially moves with hollow screw mandrel 10 with baffle ring 18 or pad 9 and then drive piston rod 19; Drive piston 6 by piston rod 19 again and move axially (advance or pull out), thereby can change the volume size of the sample cavity between end cap 2 and the piston 6, pull out the volume that piston can increase sample cavity; Thereby making the pressure in the sample cavity is negative pressure, helps the degassing; Propelling piston can reduce the volume of sample cavity, thereby the pressure in the sample cavity is increased gradually, helps the insertion of chromatogram sample introduction needle and gets gas.
Use the operation steps of sealable tank of the present invention following:
(1) before using sealable tank, at the indoor bottom end cover 2 that unloads earlier, be pulled to the lowest part of cylindrical shell to piston 6, the saturated brine of packing into and having configured is in right amount built end cap 2 then and is sealed cylindrical shell 5;
(2) behind the field, unload bottom end cover 2, put into cylindrical shell 5 to an amount of (or having weighed) pedotheque of gathering again, let saturated brine flood sample, cover end cap 2 then, and pin nut and 22 load onto and screw.Because the top of saturated brine in the cylindrical shell after lid is tight (this moment, sealable tank answered end cap 2 to stand up up) is air; Can be earlier be inserted through air extracting seal pad 3, rotate rotary sleeve 16 then, promote piston 6 and move certain scale on slowly getting entry needle that gas uses central through hole from contact pin pressure cap 1; Can drive the air in the cylindrical shell 5 gradually away; Flow out to end from the entry needle mouth until saturated brine, this moment can be the entry needle contact pin pressure cap 1 that pulls out and screw, and open-air like this sample collecting goes on foot and gathers completion.The open-air pedotheque that often will gather a plurality of points all gathers by this step and carries out;
(3) get back to indoor after, with rotary sleeve 16 derotations of all sealable tanks, the minimum point that is pulled to piston 6 cylindrical shell 5 is ended, the top of the interior saturated brine of tube just is in the low vacuum negative pressure state like this.In this state, install static stood up one hour or certain hour after, just can send the test analysis chamber to get the gas analysis;
(4) get the gas process: sealable tank is in and stands up the position, and rotation rotary sleeve 16 moves piston 6 on slowly, when the superjacent air space of saturated brines is contracted to 2-3ml gradually in the cylindrical shell 5, to recover malleation.The chromatogram sample introduction needle is inserted through air extracting seal pad 3 about 2-3mm from the central through hole of contact pin pressure cap 1 bleeds, suction is arranged, still negative pressure of barrel space is described, then continue to move on the propelling piston 6, do not have suction until feel like the feel syringe plunger.The gas appearance of extracting then directly gets into gas chromatograph or isotope mass spectrometer is analyzed.
Sealable tank is packed into and is kept end cap 2 in last vertical position behind the sample always in the course of work.
Verify effect of the present invention through a contrast experiment below:
Two boring samples with certain farmland are example, and respectively through after headroom technology of the prior art and the sealable tank of the present invention processing, hydrocarbon content that obtains (μ L/L) and component data comparing result are as shown in table 1 with same sample.
Table 1
Can find out that from table 1 hydrocarbon content that uses sealable tank of the present invention to obtain is obviously higher, and component is more complete.
Technique scheme is one embodiment of the present invention; For those skilled in the art; On the basis that the invention discloses application process and principle, be easy to make various types of improvement or distortion, and be not limited only to the described method of the above-mentioned embodiment of the present invention; Therefore the mode of front description is just preferred, and does not have restrictive meaning.
Claims (10)
1. soil physics adsorbed hydrocarbons vacuum desorption sealable tank, it is characterized in that: said sealable tank comprises that cylindrical shell (5), end cap (2) and piston move degassing assembly;
Wherein, said cylindrical shell (5) is the tube-in-tube structure of both ends open, and the one of which end is the sample introduction end, is used to put into sample, and the other end is the working end, is used for fixing said piston and moves degassing assembly;
Said end cap (2) is detachable to be installed on the sample introduction end of cylindrical shell (5), and the inner chamber of cylindrical shell (5) is sealed;
Said piston moves degassing assembly and comprises end cap nut (12), piston (6) and rotary sleeve (16);
One end of said end cap nut (12) is fixed on the working end of cylindrical shell (5); The other end is sleeved in the endoporus of said rotary sleeve (16);
Said piston (6) is installed in the inner chamber of said cylindrical shell (5), and it is coaxial with cylindrical shell (5), and in the inner chamber of cylindrical shell (5), moves; On the end face of the piston (6) of end cap nut (12), be fixed with piston rod (19), the other end traversing through end box nut (12) of piston rod (19) becomes free end;
Thrust bearing (17) is housed on the free-ended outside surface of said piston rod (19), and thrust bearing (17) is fixed with baffle ring (18) through the axle that is installed on piston rod (19) outside surface; On the outside surface of the piston rod of locating near piston (6) (19), be set with pad (9);
On the outside surface of the piston rod (19) between pad (9) and the thrust bearing (17), be set with hollow screw mandrel (10); The two ends of said hollow screw mandrel (10) withstand on respectively on pad (9) and the thrust bearing (17), and between the two for movingly; Hollow screw mandrel (10) has external thread, matches with the internal thread of end cap nut (12);
In the endoporus of said rotary sleeve (16), be fixed with coupling sleeve (20); On the endoporus face of cylinder of said coupling sleeve (20), be fixed with and the homoaxial key of said hollow screw mandrel (10) (21); Have axial long recess on the outside surface of said hollow screw mandrel (10), said key (21) slippage in axial long recess;
Rotation rotary sleeve (16); Rotary sleeve (16) drives coupling sleeve (20) and rotates together; Drive hollow screw mandrel (10) rotation through key (21) again, because the external thread of hollow screw mandrel (10) and the screw-internal thread fit of fixed end caps nut (12), hollow screw mandrel (10) moves axially simultaneously; Promote thrust bearing (17) and axle and axially move with hollow screw mandrel (10), move axially by piston rod (19) drive piston 6 again with baffle ring (18) or pad (9) and then drive piston rod (19).
2. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 is characterized in that: the aspirating hole that has perforation at the center of said end cap (2); Air extracting seal pad (3) and contact pin pressure cap (1) from inside to outside are housed in said aspirating hole successively;
Center at said contact pin pressure cap (1) has through hole;
Said aspirating hole has one section internal thread; Said contact pin pressure cap (1) has external thread, and the external thread of contact pin pressure cap (1) matches with the internal thread that end cap (2) is gone up aspirating hole.
3. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 and 2, it is characterized in that: the inside surface of end cap (2) is designed to sphere or inclined-plane, is the thinnest place of end cap (2) at the shaft centre line place.
4. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 and 2; It is characterized in that: with the end cap (2) of said cylindrical shell (5) inwall contact position on groove in end cap O type circle (4) is housed, be used for the sealing between end cap (2) and cylindrical shell (5) inside surface;
In the groove of the external cylindrical surface of said piston (6), piston O type circle (7) is housed, is used for the sealing between piston (6) and cylindrical shell (5) inside surface.
5. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 is characterized in that: cooperating for movingly between the outside surface of piston rod (19) and pad (9), the hollow screw mandrel (10);
First annular ring of said thrust bearing (17) contacts with the end face of said hollow screw mandrel (10), and second annular ring contacts with the medial surface of axle with baffle ring (18); It between two annular rings rolling steel balls;
Cooperating for movingly of the outside surface of the interior circle of first annular ring and piston rod (19), the interior circle of second annular ring is a transition fit with the cooperating of outside surface of piston rod (19).
6. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 is characterized in that: with the outer cylinder surface of said rotary sleeve (16) the said end cap nut in contact position (12) on have coaxial annular groove;
On said rotary sleeve (16), be fixed with stop screw (13), said stop screw (13) passes the inner periphery of said rotary sleeve (16);
The no thread end of said stop screw (13) is sleeved in the spacing guide (14), and stop screw (13) is rotatably assorted with said spacing guide (14); Annular groove on the outside surface of spacing guide (14) and the end cap nut (12) movingly, spacing guide (14) slides in annular groove.
7. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 is characterized in that: said coupling sleeve (20) is fixedly connected with rotary sleeve (16) through sunk screw (15).
8. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1 is characterized in that: said end cap (2) is connected with cylindrical shell (5) through nut pin (22); Said end cap nut (12) is fixedly connected with cylindrical shell (5) through dormant bolt (11).
9. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1, it is characterized in that: the outside surface at said cylindrical shell (5) is marked with the volume scale.
10. soil physics adsorbed hydrocarbons vacuum desorption sealable tank according to claim 1, it is characterized in that: said cylindrical shell (5) is processed by organic glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110023521.5A CN102607902B (en) | 2011-01-21 | 2011-01-21 | Sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110023521.5A CN102607902B (en) | 2011-01-21 | 2011-01-21 | Sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil |
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| CN102607902A true CN102607902A (en) | 2012-07-25 |
| CN102607902B CN102607902B (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110023521.5A Active CN102607902B (en) | 2011-01-21 | 2011-01-21 | Sealed canister for vacuum-desorbing physically-adsorbed hydrocarbon in soil |
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| CN106289673A (en) * | 2016-09-28 | 2017-01-04 | 国家海洋标准计量中心 | Deep water overpressure resistant meausring apparatus |
| CN107588995A (en) * | 2016-07-06 | 2018-01-16 | 中国石油化工股份有限公司 | A kind of adsorption equilibrium tank and its application |
| CN109372722A (en) * | 2017-12-15 | 2019-02-22 | 北京市人工影响天气办公室 | Inlet duct for weather modification laboratory |
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| CN105092314A (en) * | 2014-05-23 | 2015-11-25 | 中国石油化工股份有限公司 | Apparatus for collecting head-space gas, and method using apparatus |
| CN105092314B (en) * | 2014-05-23 | 2020-01-24 | 中国石油化工股份有限公司 | Apparatus for headspace collection and method of using the same |
| CN107588995A (en) * | 2016-07-06 | 2018-01-16 | 中国石油化工股份有限公司 | A kind of adsorption equilibrium tank and its application |
| CN106289673A (en) * | 2016-09-28 | 2017-01-04 | 国家海洋标准计量中心 | Deep water overpressure resistant meausring apparatus |
| CN109372722A (en) * | 2017-12-15 | 2019-02-22 | 北京市人工影响天气办公室 | Inlet duct for weather modification laboratory |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102607902B (en) | 2014-05-21 |
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