CN105547962A - One-dimensional simulation device for migration and transformation of solutes in underground water under high water pressure action - Google Patents

One-dimensional simulation device for migration and transformation of solutes in underground water under high water pressure action Download PDF

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Publication number
CN105547962A
CN105547962A CN201610014746.7A CN201610014746A CN105547962A CN 105547962 A CN105547962 A CN 105547962A CN 201610014746 A CN201610014746 A CN 201610014746A CN 105547962 A CN105547962 A CN 105547962A
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flange
anaerobic condition
water
condition post
arm
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CN201610014746.7A
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CN105547962B (en
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赵丽
王世东
杨建�
杨志斌
甄晓歌
孟红旗
夏大平
王心义
罗绍河
田云飞
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河南理工大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/0806Details, e.g. sample holders, mounting samples for testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample

Abstract

The invention belongs to the technical fields of hydrogeology, geosciences, environmental science and engineering research, and provides a one-dimensional simulation device for simulating migration and transformation of solutes in underground water under the high water pressure action. The one-dimensional simulation device is high in safety. The one-dimensional simulation device for migration and transformation of the solutes in the underground water under the high water pressure action comprises a water tank, a booster pump, a one-way valve, a safety valve, an aquifer dielectric cylinder with a special flange structure, a needle-shaped valve and a sampling device which are sequentially connected in series; the booster pump and the aquifer dielectric cylinder are connected by adopting a high-pressure rubber hose, and the aquifer dielectric cylinder, flanges, a flange sampling inlet branch pipe and a flange sampling outlet branch pipe are all made of a high-pressure-resistant anti-corrosive stainless steel material. The device has the following advantages that the design is simple, operation is easy, maintenance is convenient, the water pressure is accurate in control and convenient to regulate, the maximum water pressure that the device can simulate is 10 MPa, the device is suitable for an experimental environment with the pH of 6.5-9, the high water pressure environment of the deep underground water can be effectively simulated, long-term and stable operation can be achieved, and the requirements of indoor simulation research are met.

Description

The One-dimensional simulation device that in underground water, under high hydraulic pressure effect, solute migration transforms
Technical field
The invention belongs to hydrogeology, geoscience, Environmental Science and Engineering studying technological domain, particularly one is under high hydraulic pressure effect, the One-dimensional simulation device of solute Transport And Transformation in underground water.
Background technology
Underground water is the important water source of China's industry, agricultural, domestic water, and the underground water table that irrational exploitation cause constantly declines and the change of groundwater occurrence environment, and Groundwater Geological Problems is shifted to deep layer by shallow-layer.The indoor soil-column simulated experiment of solute is the important research means of Study of The Underground water pollutant Transport And Transformation mechanism, and current existing one dimension column simulation experimental provision is confined to the simulation of shallow ground water and low hydraulic condition more.Such as, " in underground water volatile organic contaminant Transport And Transformation analogue means and the application " of people's designs such as Li Hui, adopt room temperature 22 ° of C, the hydraulics come within the scope of simulate formation 10m by the head difference between regulating tank and cylinder studies the migration rule of organic contaminant; " groundwater seepage simulation test device and the simulation experiment method " of people's designs such as the He Shu village, is applicable to the experimental enviroment of normal pressure.
From the research of forefathers, reflect that the One-dimensional simulation device of solute in current underground water exists following defect: the earth pillar device that one present stage uses, " temperature control-pressure control underground water transfluent pollution simulation system " of people's designs such as such as Ma Chuanming, although with the conveniently adjusted hydraulic pressure of voltage operated device, but because design earth pillar material is plexi-glass tubular, and be confined to the hydraulics of low pressure-bearing, simulated mostly be aeration zone, groundwater environmental system that buried depth is less than 200m, the pressure of high hydraulic pressure as 2MPa can not be born; The earth pillar device that its two present stage uses, cylinder flange mostly is planar design, and the liner sealing gasket between flange is gum material, and the resistance to effect that can't stand high hydraulic pressure, easily leaks and damage.
Summary of the invention
The object of this invention is to provide the simulation system that when maximum hydraulic pressure in a kind of underground water reaches 10MPa, solute migration transforms, system solves the problem the deficiency in above-mentioned background technology, to overcome the above-mentioned defect that prior art exists, can realize the simulation of high hydraulic condition in underground water, design anaerobic condition post also can be used for the environmental baseline of the simulation package band of gas, low hydraulic pressure.Experimental provision simplicity of design, easy to operate, Stress control is accurate, and security is high, thus meets the high hydraulic condition in lab simulation deep phreatic water needed for solute migration conversion.
The One-dimensional simulation device that in described underground water, under high hydraulic pressure effect, solute migration transforms, comprise the water tank, supercharge pump, retaining valve, safety valve, anaerobic condition post, needle valve and the sampler that are sequentially connected in series, be filled with water-bearing media in described anaerobic condition post, be filled with silica sand at cylinder two ends, in anaerobic condition post cylinder, certain thickness filter felt is equipped with at two ends.
Described cylinder flange is provided with groove, and blind flange is provided with tongue, and the tongue of blind flange should be able to closely embed in flange groove, and flange bottom portion of groove is equipped with metal wound gasket circle, flange groove, blind flange tongue should with place flange or blind flange one-shot forming.Cylinder flange and blind flange with bolts, cylinder, flange, blind flange, blind flange sample introduction, go out sample arm and be high pressure resistant anticorrosion stainless steel material, can effectively prevent under water under high pressure effect flange, the leaking and flange distortion, cracking of bolt junction.
Booster pump outlet installs retaining valve, highly pressurised liquid is prevented to be back in supercharge pump, the sample introduction arm at anaerobic condition post blind flange center is provided with safety valve and tensimeter, going out on sample arm of anaerobic condition post blind flange center is provided with tensimeter and needle valve, connecting tube between supercharge pump and anaerobic condition post sample introduction arm, the anaerobic condition post flange connecting tube gone out between sample arm and sampler are high pressure resistant rubber hose, and in anaerobic condition post, the Darcy velocity of current is less than 1cm/h.
Described water-bearing media is the ground of study area underground reservoir, by voltage operated device, ensures the high hydraulic pressure environment in approximate simulation research water-bearing zone.
Described analogue means provides the new equipment of water-soluble inorganic, organic solute or contaminant transportation transformation mechanism research under high hydraulic pressure effect in a kind of Study of The Underground water, and this device also can as the analogue means of research pollutant Transport And Transformation in aeration zone, shallow ground water.
The One-dimensional simulation device that in underground water provided by the present invention, under high hydraulic pressure effect, solute migration transforms compared with prior art has following advantage: one is be optimized design to anaerobic condition post flange arrangement, by the flange of existing use, blind flange planar structure changes into recessed, the spatial structure of tongue, by flange groove, the embedded connection of blind flange tongue, in flange groove, filling metal is wound around packing ring, the measures such as bolted, effectively prevent the flange cracked under high hydraulic pressure effect, distortion, the problems such as leakage, two be solve existing routine use earth pillar device flange rubber seal ring yielding, can not the problem of withstand high pressures, by installing supercharge pump and adopting safety valve to regulate hydraulic pressure, needle valve coutroi velocity, the maximum hydraulic pressure that anaerobic condition post can bear is 10MPa.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is water-bearing media post flange arrangement schematic diagram of the present invention.
Fig. 3 is water-bearing media post blind flange bottom plan view of the present invention.
Fig. 4 is water-bearing media post flange vertical view of the present invention.
In figure: 1-water tank, 2-silica gel hose, 3-supercharge pump, 4-retaining valve, 5-safety valve, 6-high pressure rubber hose, 7-blind flange sample introduction arm, 8-tensimeter, 9-anaerobic condition column holder, 10-pressure transducer, 11-Stress control instrument, 12-anaerobic condition post, 13-water-bearing media, 14-silica sand, 15-blind flange goes out sample arm, 16-needle valve, 17-high pressure rubber hose, 18-tensimeter, 19-sampler, 20-filters felt, 21-cylinder flange, 22-cylinder flange groove, 23-bolt, 24-metal wound gasket circle, 25-blind flange tongue, 26-blind flange, 27-water-bearing media post cylinder flange inner wall, 28-bolt hole, the centre-drilling hole of 29-blind flange.
Embodiment
See Fig. 1, the One-dimensional simulation device that in described underground water, under high hydraulic pressure effect, solute migration transforms, comprise water tank 1, supercharge pump 3, retaining valve 4, there is the anaerobic condition post 12 of special flange structure, safety valve 5, needle valve 16, tensimeter 8 and 18, pressure transducer 10, pressure display circuit control assembly 11, sampler 19 and filter felt 20, wherein water tank 1, supercharge pump 3, anaerobic condition post 12, be connected in series by pipeline between sampler 19, connecting tube between water tank 1 and supercharge pump 3 is silica gel hose 2, supercharge pump 3, anaerobic condition post 12, connecting tube 6 between sampler 19, 17 is high pressure rubber hose, to meet the requirement of experiment of flow rate of water flow low in simulated experiment and high hydraulic pressure, silica sand 14 is filled with in anaerobic condition post 12, water-bearing media 13 and filter felt 20.
See Fig. 1 and Fig. 2, described anaerobic condition post 12 is cylindrical, column casing wall thickness 8 ~ 12mm, internal diameter 50 ~ 100mm, length 500 ~ 1000mm, cylinder two ends manage blue 21, flange 21 internal diameter is equal with anaerobic condition post 12 column casing internal diameter, anaerobic condition post 12 is connected and sealed by flange 21, blind flange 26 and bolt 23, place of flange center establishes sample introduction arm 7 or goes out sample arm 15, column casing 12, flange 21, blind flange 26 and enter (going out) sample arm 7(15 with blind flange) be high pressure resistant anticorrosion stainless steel material.
See Fig. 2, Fig. 3 and Fig. 4, the cylinder flange 21 be connected with blind flange 26 is provided with the groove 22 of one fixed width, require that groove external diameter is less than the flange diameter at bolt place, the blind flange 26 be connected with cylinder flange 21 is provided with tongue 25, should guarantee that tight the embedding in flange groove 22 rearward recess of blind flange tongue 25 does not have gap, the thickness (H) of blind flange tongue 25 at least should be equal with the degree of depth of flange groove 22 (H '), and be not more than 1.3H '.Metal wound gasket circle 24 is housed bottom flange groove 22, the thickness of metal wound gasket circle 24 is less than the degree of depth of flange groove 22, effectively can prevent leakage, flange groove 22, blind flange tongue 25 should be one-shot forming with place flange or blind flange, non-solder or bonding composition, can effectively prevent under high hydraulic pressure effect at flange 21, blind flange 26, the leakage of bolt 23 junction, distortion, cracking.
See Fig. 3 and Fig. 4, anaerobic condition post flange 21, blind flange 26 is evenly distributed with eight bolts hole 28 at same position place respectively, bolt aperture 20 ~ 40mm, flange uniform force when can ensure bolted, prevent distortion and leakage, the boring of blind flange 26 center is welded with sample introduction arm 7 or goes out sample arm 15, its internal diameter is 6 ~ 10mm, wall thickness 3 ~ 4mm, long 40 ~ 60mm, to hole 29 diameters and sample introduction arm 7, go out sample arm 15 internal diameter equal, the low discharge flux of target solution in anaerobic condition post in analogue means can be met and tolerate the effect of high hydraulic pressure, sample introduction arm 7, go out sample arm 15 can facilitate and be connected with high pressure rubber hose, cylinder flange 21, blind flange 26 thickness is not less than 35mm, ensure that flange has stronger resistance to compression, non-deformability.
Water-bearing media 13 is filled with in anaerobic condition post, described water-bearing media is the rock soil medium of study area ground water aquifer, as the core that 500m buried depth place, underground obtains, through air-dry, pulverizing, cross the sieve of 2mm, uniform filling, in post, effectively can simulate the Transport And Transformation process of solute in water-bearing media 13.Water-bearing media 13 two ends are filled with the thick silica sand of 20 ~ 50mm 14, play the effect of even cloth liquid, the filter felt 20(placing 5 ~ 7mm thickness between silica sand 14 and blind flange 26 filters felt 20 diameter and equals anaerobic condition post cylinder internal diameter), prevent test rock soil medium Particle Blocking sample introduction or outlet.
Supercharge pump 3 is furnished with frequency conversion facility and can regulates flow, flow range 0 ~ 10mL/min, retaining valve 4 installed by supercharge pump 3 outlet, prevent solution from flowing backwards, the sample introduction arm 7 at anaerobic condition post blind flange 26 center is provided with safety valve 5 and tensimeter 8, regulate the safety valve 5 on anaerobic condition post blind flange sample introduction arm 7, by observing the reading of tensimeter 8, regulate pressure to required value, the maximum hydraulic pressure of requirement anaerobic condition post sample introduction arm 7 feed liquor is 10Mpa, go out sample arm 15 place and be provided with tensimeter 18 and needle valve 16, needle valve 16 can control effectively to going out flow velocity and regulate under high hydraulic pressure effect, anaerobic condition post 12 cylinder is provided with pressure transducer 10, and show hydraulic pressure by pressure display circuit control assembly 11, package unit can realize the water inlet to anaerobic condition post, hydraulic pressure in water outlet and anaerobic condition post 12 carries out effective monitoring.
When the One-dimensional simulation experiment carrying out solute migration conversion under high hydraulic pressure effect in underground water, carry out according to following steps.
First silica gel hose 2 is adopted to be connected by between water tank 1 with anaerobic condition post injection port 7 before experiment, deionized water is added in water tank 1, input deionized water from populated anaerobic condition post 12 bottom flange sample introduction arm 7 and be exhausted full water, the height of water tank 1 water surface should go out the height of sample arm 15 higher than anaerobic condition post, guarantee that in anaerobic condition post 12, water-bearing media 13 can be vented full water completely.
Silicone tube 2 is adopted to connect water tank 1, supercharge pump 3, high pressure rubber hose 6 is adopted to be connected between supercharge pump 3 with anaerobic condition post blind flange sample introduction arm 7, the installation site of supercharge pump 3 and anaerobic condition post 12 can regulate as the case may be, and anaerobic condition post blind flange goes out between sample arm 15 with sampler 19 to adopt high pressure rubber hose 17 to be connected.
Close out the valve 16 on sample arm 15, start supercharge pump 3 to pressurize in anaerobic condition post 12, regulation safety valve 5, observe the reading of tensimeter 8, after hydraulic pressure reaches setting value and is stable, valve 16 is opened, adjust flux is to setting value, control the required value of Darcy velocity within the scope of 0.1 ~ 1cm/h going out stream in anaerobic condition post 12, continue to pass into deionized water, treat that water outlet conductivity fluctuation range is at ± 10 μ s/cm, temperature fluctuation range is at ± 1 ° of C, and during stability of flow, show that simulated groundwater flow has formed stable flow field and impurity in rock soil medium is drenched.
Target solute is changed in water tank, by fine setting safety valve 5, ensure that the stable reading of the tensimeter 8 on sample introduction arm 7 is at required value, and in time monitor force table 8,18, the water pressures of Stress control instrument 11, carry out sampling and testing according to the time set, the solute distribution and variation rule over time and space under high hydraulic pressure effect can be obtained.
This device has following effect: the high hydraulic pressure environment effectively simulating deep phreatic water, and security is high, and water-bearing media post flange is not yielding, leak, and structure is simple, easy and simple to handle, invests little.Do not exceeding the application's spirit and the various corrections of essence, distortion and replacement all drop within the protection domain of the application.

Claims (7)

1. the One-dimensional simulation device that in underground water, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: at least comprise water tank (1), supercharge pump (3), retaining valve (4), there is the anaerobic condition post (12) of special flange structure, safety valve (5), needle valve (16), tensimeter (8) (18), pressure transducer (10), pressure display circuit control assembly (11), sampler (19) and filter felt (20), wherein water tank (1), supercharge pump (3), anaerobic condition post (12), sampler is connected in series by pipeline between (19), connecting tube between water tank (1) and supercharge pump (3) is silica gel hose (2), supercharge pump (3), anaerobic condition post (12), connecting tube (6) between sampler (19), (17) be high pressure rubber hose, silica sand (14) is filled with in anaerobic condition post (12), water-bearing media (13) and filter felt (20).
2. the One-dimensional simulation device that in underground water according to claim 1, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: anaerobic condition post (12) is for cylindrical, column casing wall thickness 8mm ~ 12mm, internal diameter 50 ~ 100mm, length 500 ~ 1000mm, orchid (21) is managed at cylinder two ends, flange (21) internal diameter is equal with anaerobic condition post (12) column casing internal diameter, flange (21) and blind flange (26) are connected and sealed by bolt (23), place of flange center establishes sample introduction arm (7) or goes out sample arm (15), anaerobic condition post (12) column casing, flange (21), blind flange (26) and be connected with blind flange and be high pressure resistant anticorrosion stainless steel material into (going out) sample arm (7) (15).
3. the One-dimensional simulation device that in underground water according to claim 1, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: the cylinder flange (21) be connected with blind flange (26) is provided with groove (22) (groove external diameter is less than the flange diameter at bolt place), the blind flange (26) be connected with cylinder flange (21) is provided with tongue (25), should guarantee that tight the embedding in flange groove (22) rearward recess of blind flange tongue (25) does not have gap, the thickness (H) of blind flange tongue (25) at least should be equal with the degree of depth of flange groove (22) (H '), and be not more than 1.3H ', metal wound gasket circle (24) is equipped with in flange groove (22) bottom, the thickness of metal wound gasket circle (24) is less than the degree of depth of flange groove (22), flange groove (22), blind flange tongue (25) should be one-shot forming with place flange or blind flange, non-solder or bonding composition.
4. the One-dimensional simulation device that in underground water according to claim 1, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: anaerobic condition post flange (21), blind flange (26) is evenly distributed with eight bolts hole (28) respectively at same position place, aperture 20 ~ 40mm, blind flange (26) centre-drilling hole (29), and be welded with sample introduction arm (7) or go out sample arm (15), sample introduction arm (7), go out sample arm (15) internal diameter 6 ~ 10mm, wall thickness 3 ~ 4mm, long 40 ~ 60mm, boring (29) diameter and sample introduction arm (7) or to go out sample arm (15) internal diameter equal, cylinder flange (21), blind flange (26) thickness is not less than 35mm.
5. the One-dimensional simulation device that in underground water according to claim 1, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: described water-bearing media (13) is study area ground water aquifer rock soil medium, after natural air drying, pulverized 2mm sieve, as the filling sample of anaerobic condition post (12), the thick silica sand of 20 ~ 50mm (14) is filled at water-bearing media (13) two ends respectively, places the filter felt (20) that thickness is 5-7mm between silica sand (14) and blind flange (26).
6. the One-dimensional simulation device that in underground water according to claim 1, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: supercharge pump (3) can regulate flow, flow adjustable extent 0 ~ 10mL/min, supercharge pump (3) outlet is installed retaining valve (4), the sample introduction arm (7) at anaerobic condition post blind flange (26) center is provided with safety valve (5) and tensimeter (8), the maximum hydraulic pressure of anaerobic condition post sample introduction arm (7) feed liquor is 10Mpa, go out sample arm (15) place and be provided with tensimeter (18) and needle valve (16), anaerobic condition post cylinder there is pressure transducer (10), and by pressure display circuit control assembly (11) display hydraulic pressure.
7. the One-dimensional simulation device that in underground water according to claim 1, under high hydraulic pressure effect, solute migration transforms, it is characterized in that: before simulated experiment, first silica gel hose (2) is adopted to be connected on water tank (1) and anaerobic condition post (12), the anaerobic condition post (12) of populated rock sample (13) is first exhausted full water, close out the needle valve (16) on sample arm (15) afterwards, start supercharge pump (3) pressurization in anaerobic condition post (12), regulation safety valve (5), after the reading of sample introduction arm (7) the upward pressure table (8) at anaerobic condition post blind flange (26) center reaches setting value and is stable, the needle valve (16) gone out on sample arm (15) is opened, the Darcy velocity controlling to go out to flow in anaerobic condition post (12) is within the scope of 0.1 ~ 1cm/h, when water outlet conductivity fluctuation range is at ± 10 μ s/cm, target solute is added in water tank (1), by fine setting safety valve (5), tensimeter (8) stable reading in guarantee sample introduction arm (7) is at required value, the physical and chemical index of sampling and measuring water outlet, the solute distribution and variation rule over time and space under high hydraulic pressure effect can be obtained.
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CN110187059B (en) * 2019-05-30 2020-07-31 中国环境科学研究院 In-situ column experiment simulation system and simulation method for underground water well
CN111665180A (en) * 2020-06-03 2020-09-15 中国地质大学(武汉) Experimental system and method for slowly leaching aquifer rock samples of bedrock in multiple batches

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