CN104237079A - Experimental method and device for measuring diffusion coefficient of carbon dioxide in water - Google Patents
Experimental method and device for measuring diffusion coefficient of carbon dioxide in water Download PDFInfo
- Publication number
- CN104237079A CN104237079A CN201410528991.0A CN201410528991A CN104237079A CN 104237079 A CN104237079 A CN 104237079A CN 201410528991 A CN201410528991 A CN 201410528991A CN 104237079 A CN104237079 A CN 104237079A
- Authority
- CN
- China
- Prior art keywords
- diffusion
- still
- coefficient
- temperature
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses an experimental method and device for measuring a diffusion coefficient of CO2 in water. The experimental device adopts a fixed diffusion distance and mainly comprises a data acquisition system, a constant temperature heating system, a pH meter probe, a diffusion kettle, a pressure sensor, a temperature probe and the like, wherein the pH meter probe is installed on a lower end cover of the diffusion kettle, the pressure sensor is installed on an upper end cover, one end of the temperature probe is connected with a heating coil outside the diffusion kettle, and the other end of the temperature probe is connected with the constant temperature heating system. When an experiment is performed in the diffusion kettle, the diffusion kettle is installed on a bearing and is turned to simulate a tilted stratum, pressure is utilized to calculate initial concentration of the CO2 according to an ideal gas equation, the hydrolysis amount of the CO2 is calculated according to a pH value acquired by the data acquisition system, a fitted curve of the CO2 hydrolysis amount and time square root is drawn to obtain slope k, and the diffusion coefficient D is calculated according to a calculation model.
Description
Technical field
The present invention relates to CO
2burying potentiality technical field, is a kind of measurement CO
2the experimental technique of coefficient of diffusion and device in water, especially for CO
2bury experimental technique and device that coefficient of diffusion parameter in process carries out measuring.
Background technology
At present, people ask for the main burning by fossil fuel to the energy, and the reduction of discharging of greenhouse gases becomes the focus that the mankind pay close attention to.China has become the second largest energy-consuming big country being only second to the U.S. in the world, bears reduction of greenhouse gas discharge obligation from 2013.The carbon emission amount of China is all increasing progressively every year, and discharge capacity is about to exceed the U.S. soon.From the national conditions of China, actively develop CO
2ground storage research is extremely important.
The trapping of greenhouse gases, seal up for safekeeping and utilize technology to be the most promising most effective method slowing down that greenhouse gases pollute, and deep brine layer due to its have trap structure grow general, exist and be suitable for CO
2the big trap structure stored and the general salineness of deep aquifers is higher can not can be buried body by as important as water resource these important feature that are used.So strengthen CO
2the research that brine layer is sealed up for safekeeping and test can be scale CO
2brine layer is sealed up for safekeeping provides scientific basis.And CO
2diffusion Law in salt solution is sealed up for safekeeping and the research of major influence factors thereof are for assessment CO
2bury burying for a long time of project to be absolutely necessary with risk investigation.At present for CO
2the experimental study of coefficient of diffusion is inadequate, needs to strengthen further.
Summary of the invention:
Technical matters to be solved by this invention is for the deficiencies in the prior art, provides one to utilize pH meter measurement to carry out CO
2diffusion experiment method and apparatus.
Technical scheme of the present invention is as follows:
A kind of measurement CO
2the experimental technique of coefficient of diffusion and device in water, setting pressure sensor and pH meter probe respectively at the two ends of diffusion still, have injecting hole in the upper end of reactor, be used for injecting the CO needed
2gas.Pressure transducer is connected with pH value display instrument with pressure display instrument by wire respectively with pH meter probe, then connects with data acquisition system (DAS) respectively by wire.The use of pH meter probe is the place of this device innovation, diffusion still is the main part of this experimental provision, wherein spread still to be made up of inside and outside two-layer cylinder, internal layer is diffusion space, Inner fills out the test mediums such as salt solution, and skin is temperature control, is designed to the heater coil around full internal layer steel cylinder, carrying out the temperature of Control release, is one deck protection iron sheet tube at the outermost layer of diffusion still.The injecting hole at reactor two ends is connected with gas cylinder by pipeline, and pipeline has a controlled valve.Temp probe socket is also equipped with in the centre of diffusion still, probe one end directly touches inwall with the inner core of diffusion still by socket, the other end is connected with temperature controller by wire, temperature in Real-Time Monitoring diffusion still, stop heating when spreading constant-temperature heating system when the temperature in still reaches the experimental temperature of setting, it is temperature required that constant temperature system makes whole diffusion still inside remain on experiment always.PH meter probe can bear the required pressure of experiment, by device for screwing up be arranged on diffusion still end cap center pit in, measure the pH value change in diffusion still in real time.The middle part of diffusion still to be connected with support by bearing and rack-mount, and spreading still can rotate with vertical direction in the horizontal direction and can fix at an arbitrary position.
First the end cap that pH meter probe is housed is arranged on diffusion still lower end during experiment, injection experiments medium in diffusion still, then opens heating arrangement, arranges the temperature that experiment is preset, after temperature stabilization, the upper end cover with pressure transducer is installed, then inject CO by pipeline
2.According to pressure transducer, measure and inject CO
2the original pressure of gas, in conjunction with the volume V of headspace in diffusion still, calculates CO by perfect condition equation P V=nRT
2initial concentration.Utilize the pH value in the diffusion still of the pH meter probe measurement bottom diffusion still, pH value calculates H in solution
+concentration, the CO after being dissolved in water
2h in water after ionization
+concentration equal with the concentration of bicarbonate ion (ignoring the existence of carbanion), such H
+just represent the CO after an ionization
2molecule, uses H
+concentration represent CO
2concentration after ionization, can be calculated the CO of ionization by pH value by the Changing Pattern of data acquisition system pH value
2amount, draw CO
2amount of hydrolysis and time subduplicate matched curve, obtain slope k, according to
diffusion coefficient D can be tried to achieve.
The invention has the beneficial effects as follows: the situation of change that can be got information about pH in diffusion still by pH meter probe, thus calculate CO by pH value
2diffusing capacity, calculate coefficient of diffusion.The middle part of diffusion still is designed with bearing, diffusion still can be made to realize the rotation of level and vertical direction and can fix at an arbitrary position, this makes it possible to the stratum of simulating various angle of inclination.
Accompanying drawing illustrates:
Fig. 1 measures CO according to the present invention's one
2the structural representation of the experimental provision of coefficient of diffusion in water.
In figure: 1-computerized data acquisition system; 2-constant-temperature heating system, temperature indicator; 3-pressure display instrument; 4-pressure transducer; 5-controlled valve; 6-gas cylinder; 7-injecting hole; 8-end cap screw; 9-upper end cover; 10-heater coil; 11-diffusion still; 12-protection iron sheet tube; 13-bearing; 14-support; 15-bottom end cover; 16-pH meter is popped one's head in; 17-temp probe; 18-pH value display instrument.
Embodiment:
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1 utilizes pH meter measurement to carry out CO
2the principle of diffusion experiment and implementation step
As shown in Figure 1, diffusion still 11 is installed on the support 14, the geometric center spreading still bottom end cover 15 is arranged on by installing pH meter probe 16, pressure transducer is arranged on the upper end cover 9 of diffusion still, the upper end cover end cap that pressure transducer is housed has injecting hole 7, becomes geometry symmetrical with pressure transducer about end cap central.PH meter probe 16 is connected with pH value display instrument 18 and pressure display instrument 3 by wire with pressure transducer 4, and then display instrument is connected with data acquisition system (DAS) 1 by wire.The injecting hole of reactor 11 upper end cover is connected with gas cylinder 6 by pipeline, pipeline is provided with a controlled valve 5.The use of pH meter probe 16 is places of this experimental provision most innovation, diffusion still 11 is main parts of this experimental provision, diffusion still is made up of inside and outside two-layer cylinder, its internal layer is reflection space, Inner fills out the dispersive mediums such as salt solution, skin is heater coil 10, adds the interlevel dielectrics of thermal diffusion still, and the outermost layer of diffusion still is protection iron sheet tube 12.Outside protection iron sheet tube 12, in the middle part of diffusion still, be designed with temperature sensing probe 17 socket, temp probe 17 is inserted probe socket and feed back the temperature spread in still, temp probe 17 other end is connected with temperature indicator 2 by wire.The middle part of diffusion still 11 is installed on the support 14 by bearing 13, and diffusion still can be made to carry out level and vertical rotation and can fix at an arbitrary position.
When testing, first with distilled water pH meter probe 16 and diffusion still 11 clean up, configuration pH be 4.01 and pH be 6.86 titer correct pH meter probe 16 accuracy, after calibration accuracy by screw 8 be fixed on diffusion still lower end.Configuration needs the NaCl solution of concentration to be injected in diffusion still 11, temperature required to testing by heating arrangement 2 regulating system temperature, open pH value display instrument 18, temperature feeds back to constant-temperature heating system 2 by temp probe 17, when reaching the experimental temperature of setting, system stops heating, it is temperature required that constant temperature system makes whole diffusion still inside remain on experiment always, after pH value and temperature are all stablized, the upper end cover 9 with pressure transducer passed through screw tightening.Connect gas cylinder 6 and diffusion still 11 by pipeline, open force pressure display instrument 3, gas injection controlled valve 5, observe pressure display instrument, reach valve-off after experimental pressure, Rotational diffusion still, regulates the pitch angle of diffusion still, makes it reach the inclination angle of requirement of experiment.Pressure display instrument 3 is connected with data acquisition system (DAS) 2 by wire, by the initial injection pressure gathered, calculates inject CO according to equation for ideal gases PV=nRT
2initial concentration.PH value display instrument 18 is connected with data acquisition system (DAS) 1 by wire, utilizes data acquisition system pH value, and the pH value in the diffusion still measured by the pH meter probe bottom diffusion still calculates H in solution
+concentration, the CO after being dissolved in water
2h in water after ionization
+concentration equal with the concentration of bicarbonate ion (ignoring the existence of carbanion), such H
+just represent the CO after an ionization
2molecule, uses H
+concentration represent CO
2concentration after ionization, namely calculates the CO of ionization by the pH value of data acquisition system
2amount, thus draw CO
2amount of hydrolysis and time subduplicate matched curve, obtain slope k, according to
diffusion coefficient D can be tried to achieve.
Claims (6)
1. measure CO for one kind
2the experimental provision of coefficient of diffusion in water, mainly comprise diffusion still, gas injection system, constant-temperature heating system and data acquisition system (DAS), it is characterized in that: diffusion still internal layer is back-up sand cavity, skin is heater coil, steel cylinder is had to be separated by between ectonexine, heater coil outside is iron sheet protective seam, at the two ends of diffusion still, setting pressure measuring instrument, pH meter are popped one's head in respectively, by wire Bonding pressure display instrument and pH value display instrument, be used for measuring the pH value change of pressure in diffusion system and medium respectively; Around diffusion still, there is heater coil, be connected with temperature controller by the wire with temp probe, Control release temperature; Be added with injecting hole in upper end, be connected with gas cylinder by pipeline; Pressure-measuring system is all connected with data acquisition system (DAS) by wire with pH measuring system, completes the automatic collection of data.
2. measurement CO according to claim 1
2the experimental provision of coefficient of diffusion in water, is characterized in that: pH meter probe can bear the required pressure of experiment, by device for screwing up be fixed in diffusion still end cap center pit in.
3. measurement CO according to claim 1
2the experimental provision of coefficient of diffusion in water, is characterized in that: the external heating coil of diffusion still is connected with constant-temperature heating system by a temp probe, and the temperature in feedback diffusion still, to constant-temperature heating system, stops heating keeping temperature.
4. measurement CO according to claim 1
2the experimental provision of coefficient of diffusion in water, is characterized in that: the middle part of diffusion still to be connected with support by bearing and rack-mount, and spreading still can rotate with vertical direction in the horizontal direction and can fix at an arbitrary position.
5. one kind utilizes the measurement CO according to any one described in claim 1 ~ 4
2in water, the experimental provision of coefficient of diffusion carries out CO
2the method of diffusion experiment, is characterized in that: (1) injects CO in diffusion still
2gas, by pressure transducer, measures and injects CO
2the original pressure of gas, calculates CO by perfect condition equation P V=nRT
2initial concentration; (2) utilize the pH value in the pH meter probe measurement diffusion still bottom diffusion still, by the Changing Pattern of data acquisition system pH value, calculate CO by pH value
2the amount of hydrolysis; (3) CO is drawn
2amount of hydrolysis and time subduplicate matched curve, obtain slope k.
6. method according to claim 5, is characterized in that: utilize forecast model
calculate CO
2coefficient of diffusion in pore media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528991.0A CN104237079B (en) | 2014-10-10 | 2014-10-10 | Experimental method and device for measuring diffusion coefficient of carbon dioxide in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528991.0A CN104237079B (en) | 2014-10-10 | 2014-10-10 | Experimental method and device for measuring diffusion coefficient of carbon dioxide in water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104237079A true CN104237079A (en) | 2014-12-24 |
| CN104237079B CN104237079B (en) | 2017-01-18 |
Family
ID=52225591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410528991.0A Expired - Fee Related CN104237079B (en) | 2014-10-10 | 2014-10-10 | Experimental method and device for measuring diffusion coefficient of carbon dioxide in water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104237079B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792663A (en) * | 2015-04-07 | 2015-07-22 | 上海大学 | Constant-pressure sealed type device for measuring oxygen exchange coefficient and oxygen diffusion coefficient |
| CN105424729A (en) * | 2015-11-18 | 2016-03-23 | 西南石油大学 | CO2 saltwater layer sequestration experimental device and method |
| CN105653766A (en) * | 2015-12-24 | 2016-06-08 | 中北大学 | Method for calculating molecular diffusion coefficients through non-equilibrium molecular dynamics simulation |
| CN112748230A (en) * | 2020-12-16 | 2021-05-04 | 中国科学院武汉岩土力学研究所 | Dissolved air balance monitoring system and method for preparing gas-containing soil sample |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008008632A (en) * | 2006-06-27 | 2008-01-17 | Nippon Soken Inc | Method for evaluating diffusibility of gas in porous member of water-containing state |
| CN102735592A (en) * | 2012-06-29 | 2012-10-17 | 中国石油大学(华东) | Apparatus for measuring diffusion coefficient of carbon dioxide in rock |
| CN102809526A (en) * | 2012-08-27 | 2012-12-05 | 中国石油大学(华东) | Method for measuring diffusion coefficient of carbon dioxide in saturated oil core |
| CN103884628A (en) * | 2014-03-14 | 2014-06-25 | 大连理工大学 | Device and method for measuring diffusion coefficient of carbon dioxide in porous medium by applying CT (computed tomography) |
-
2014
- 2014-10-10 CN CN201410528991.0A patent/CN104237079B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008008632A (en) * | 2006-06-27 | 2008-01-17 | Nippon Soken Inc | Method for evaluating diffusibility of gas in porous member of water-containing state |
| CN102735592A (en) * | 2012-06-29 | 2012-10-17 | 中国石油大学(华东) | Apparatus for measuring diffusion coefficient of carbon dioxide in rock |
| CN102809526A (en) * | 2012-08-27 | 2012-12-05 | 中国石油大学(华东) | Method for measuring diffusion coefficient of carbon dioxide in saturated oil core |
| CN103884628A (en) * | 2014-03-14 | 2014-06-25 | 大连理工大学 | Device and method for measuring diffusion coefficient of carbon dioxide in porous medium by applying CT (computed tomography) |
Non-Patent Citations (3)
| Title |
|---|
| RICHARD S. MIDDLETON ET AL.: "The complex future of CO2 capture and storage: Variable electricity generation and fossil fuel power", 《APPLIED ENERGY》, vol. 108, 30 March 2013 (2013-03-30), XP 028544211, DOI: doi:10.1016/j.apenergy.2013.02.065 * |
| 任韶然 等: "CO2 地质埋存监测技术及其应用分析", 《中国石油大学学报（自然科学版）》, vol. 36, no. 1, 28 February 2012 (2012-02-28) * |
| 张卫东 等: "碳捕集与封存技术的现状与未来", 《中外能源》, vol. 14, no. 11, 31 December 2009 (2009-12-31) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792663A (en) * | 2015-04-07 | 2015-07-22 | 上海大学 | Constant-pressure sealed type device for measuring oxygen exchange coefficient and oxygen diffusion coefficient |
| CN104792663B (en) * | 2015-04-07 | 2017-10-24 | 上海大学 | Determine the constant-pressure sealing type device of oxygen exchange coefficient and diffusion coefficient |
| CN105424729A (en) * | 2015-11-18 | 2016-03-23 | 西南石油大学 | CO2 saltwater layer sequestration experimental device and method |
| CN105653766A (en) * | 2015-12-24 | 2016-06-08 | 中北大学 | Method for calculating molecular diffusion coefficients through non-equilibrium molecular dynamics simulation |
| CN105653766B (en) * | 2015-12-24 | 2018-08-14 | 中北大学 | A kind of method that non-equlibrium molecular dynamics simulation calculates coefficient of molecular diffusion |
| CN112748230A (en) * | 2020-12-16 | 2021-05-04 | 中国科学院武汉岩土力学研究所 | Dissolved air balance monitoring system and method for preparing gas-containing soil sample |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104237079B (en) | 2017-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104237079A (en) | Experimental method and device for measuring diffusion coefficient of carbon dioxide in water | |
| CN204789419U (en) | Frozen soil is frozen swelling to be melted and sinks test device based on labview dynamic data gathers | |
| CN104897554B (en) | Hypotonic rock gas pervasion test device and method of testing under vapor heat mechanics coupling effect | |
| CN103277673B (en) | Gas line blocking position determinator and assay method thereof | |
| CN102519759B (en) | Device for sampling nitrous oxide in paddy field soil | |
| CN105223232B (en) | A kind of thermal conductivity measuring instrument and measuring method | |
| CN104502163B (en) | Adjustable-depth collecting device for carbon dioxide in soil and use method of adjustable-depth collecting device | |
| CN107748081A (en) | Simulate coal core desorption of mash gas device and test device and method in low temperature location of the coring procedure | |
| CN205333462U (en) | A servo measurement testing system for testing coal sample gas absorption desorption rule | |
| CN203705435U (en) | Surface subsidence simulation test device | |
| CN204286988U (en) | A kind of experimental provision measuring carbon dioxide coefficient of diffusion in water | |
| CN105004650A (en) | Gas permeation testing method in low-permeability rock time-dependent deformation under action of thermal-gas-mecha-nical coupling | |
| CN203321470U (en) | CT scanning system based on top gas injection multi-angle displacement process | |
| CN208833538U (en) | A kind of Soil K+adsorption sample collecting apparatus | |
| CN204129037U (en) | A kind of device of novel mensuration coal petrography water-intake rate | |
| CN205333237U (en) | High -efficient gondola water faucet jet power testing arrangement | |
| CN104914017A (en) | Device and method using CT (computed tomography) technology to detect CO2 dispersion in porous media | |
| CN206281755U (en) | Porous pavement and the dual-purpose instrument for measuring permeability coefficient of test specimen | |
| CN110924943B (en) | Quantitative drainage and production experimental device for coal-bed gas well and drainage and production control method | |
| CN209446510U (en) | A kind of device suitable for on-site measurement deposit consumption rate | |
| CN204594855U (en) | The instrument of tunnel concrete water pressure permeability test under Simulated Water | |
| CN206773187U (en) | The device of gas circulation is calculated based on acoustics backscatter intensity | |
| CN103293172B (en) | Based on the CT scan rotating by multiple angles core holding unit of crestal gas injection | |
| CN207263072U (en) | A kind of drauht reading device | |
| CN105509813B (en) | A kind of heat-conduction-type geothermal field exploitation and protection analogue means and analogy method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170118 Termination date: 20171010 |