CN109443996A - Film is impregnated with the device and method of pressure value during a kind of Sensitive Detection membrane distillation - Google Patents
Film is impregnated with the device and method of pressure value during a kind of Sensitive Detection membrane distillation Download PDFInfo
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- CN109443996A CN109443996A CN201811543492.3A CN201811543492A CN109443996A CN 109443996 A CN109443996 A CN 109443996A CN 201811543492 A CN201811543492 A CN 201811543492A CN 109443996 A CN109443996 A CN 109443996A
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- membrane
- pressure value
- accommodating cylinder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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Abstract
本发明公开了一种灵敏检测膜蒸馏过程中膜浸透压力值的装置及方法，其中，装置包括储气罐、膜浸透测试组件、直流电源、高灵敏度电桥以及待测膜片；所述膜浸透测试组件包括容置筒、法兰盘和底板，所述待测膜片位于法兰盘与底板之间，在待测膜片与底板之间设有一导电片；所述储气罐经减压阀、压力调节器和压力计后与容置筒相连；在容置筒的上端和在导电片的下侧还设有上接线柱和下接线柱，所述直流电源与上接线柱与下接线柱相连；在容置筒的侧壁上还分布有两导线柱，所述高灵敏度电桥与两导线柱相连；所述方法为采用上述装置进行膜浸透压力值检测。本发明能够通过膜组件的电参数检测反映膜浸湿现象，从而快速准确指示系统可承受最大操作压力。
The invention discloses a device and method for sensitively detecting membrane permeation pressure value in a membrane distillation process, wherein the device comprises a gas storage tank, a membrane permeation test component, a DC power supply, a high-sensitivity electric bridge and a membrane to be measured; the membrane The penetration test assembly includes a accommodating cylinder, a flange plate and a bottom plate, the diaphragm to be tested is located between the flange plate and the bottom plate, and a conductive sheet is arranged between the diaphragm to be tested and the bottom plate; The pressure valve, the pressure regulator and the pressure gauge are connected with the accommodating cylinder; the upper end of the accommodating cylinder and the lower side of the conductive sheet are also provided with upper and lower terminals, and the DC power supply is connected to the upper and lower terminals. The connecting posts are connected; two lead posts are also distributed on the side wall of the accommodating cylinder, and the high-sensitivity bridge is connected with the two lead posts; the method is to use the above-mentioned device to detect the value of membrane permeation pressure. The invention can reflect the membrane wetting phenomenon through the electrical parameter detection of the membrane module, thereby quickly and accurately indicating that the system can bear the maximum operating pressure.
Description
Technical field
The present invention relates to films during membrane distillation separation technology field more particularly to a kind of Sensitive Detection membrane distillation to be impregnated with pressure
The device and method of force value.
Background technique
Membrane distillation is emerging low energy consumption (such as thermodynamic-driven of waste heat, waste heat) water treatment technology, is based on hydrophobic membrane material
A kind of filter separation method of material；Its technological principle is (by taking sea water desalination as an example): feeding liquid is (positioned at the fire end of film, high temperature
Area) in the heated vaporization of hydrone, under the driving of film two sides partial vapour pressure difference, migrate through membrane material as a vapor,
Permeate (positioned at the other end of film, low-temperature space) condensation becomes liquid water again.Ideally, point which only allows to vaporize
Son penetrates, and can intercept material existing for other any liquid, therefore the separation rate of target material may be up to 99.99%.In seawater
Water is changed into steam in membrane distillation technique and through film, and the salinity in seawater can not vaporize, still with the ion shape in solution
Formula exists, and can not penetrate film.Therefore, " stemness " for keeping membrane material is that membrane distillation technique realizes the critical support efficiently separated.
But during existing membrane distillation, the stemness membrane material in membrane distillation system can be gradually during prolonged application
" soaking " gradually has the hydrone of liquid that can enter fenestra.In one fenestra being wetted, the water of liquid will carry dissolubility
Material component penetrates, and leading to the material interception rate of the fenestra is zero.The electrowetting phenomenon of film is small from one during membrane distillation
Fenestra slowly start at any time (along fenestra depth direction), gradually develop to part, the entire membrane material of most Zhongdao is all immersed
Saturating progressive formation.Accurately detect film as early as possible soaks threshold value, to thoroughly avoid the electrowetting phenomenon of film, transports to process stabilizing
Capable and effluent quality guarantee is most important.This requirement accurately delicately detects, by great pressure when liquid initially enters fenestra
Power (vapour pressure driven by temperature difference) control.
In general, the pore size of membrane material is different, if pore size distribution range can be 0.01um-0.5um on sheet of membrane, and
Under certain operating pressure, the phenomenon that liquid enters fenestra, can preferentially occur in relatively large fenestra.It must be accurately and rapidly
It captures maximum fenestra in membrane material to occur being impregnated with phenomenon, could accurately indicate the true pressure threshold value that membrane can be born.State
It is outer to use large-scale plant, during constantly increasing pressure, by the monitoring to liquid weight, so that indicating liquid enters film
The generation in hole and " being impregnated with " phenomenon.The method precisely cannot sensitively describe being impregnated with now in the several fenestras in part some or certain
As leading to the electrowetting phenomenon lag of capture, that is, it is higher soaking threshold value (the driving pressure value of film).In membrane distillation technique operation,
If will bring quickly soaking for film using the operating pressure numerical value measured with this, entire membrane module caused to fail.
Therefore it provides a kind of liquid that sensitive can be captured on membrane material in certain macropore of part or in certain several fenestra road
" soaking " phenomenon, and then rapidly and accurately indicate that system can bear the device and method of maximum operating pressure, it would be highly desirable to it invents.
Summary of the invention
In view of the above shortcomings of the prior art, it is an object of the invention to solve above-mentioned skill existing in the prior art
Art problem provides the device and method that film during a kind of Sensitive Detection membrane distillation is impregnated with pressure value, can pass through membrane module
Electrical parameters detection reflects film electrowetting phenomenon, with the liquid immersion phenomenon on sensitive capture membrane material in macropore, thus sensitiveer,
Accurately capture the operating pressure that system when liquid immersion occurs for maximum fenestra on membrane material；And then quick and precisely indicate system
It can bear maximum operating pressure.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that such: a kind of Sensitive Detection membrane distillation
Film is impregnated with the device of pressure value in the process, it is characterised in that: is impregnated with test suite, DC power supply, highly sensitive including air accumulator, film
Spend electric bridge and diaphragm to be measured；The film is impregnated with the accommodating cylinder that test suite includes the open metal material in a upper end closed lower end
With will accommodate the bottom plate of cylinder lower end closed；It is arranged with a ring flange in the outside lower end of accommodating cylinder, which is metal material,
And it is fixedly connected with accommodating cylinder；The bottom plate is isolation material, and is connected by connecting bolt with ring flange；The diaphragm to be measured
Between ring flange and bottom plate, and cylinder lower end closed will be accommodated；A conductive sheet is equipped between diaphragm to be measured and bottom plate, and should
Diaphragm to be measured separates the lower end of conductive sheet and ring flange and accommodating cylinder；
It is equipped with liquid injection port and air inlet in the upper end of accommodating cylinder, the liquid injection port is used to inject electrolyte solution into accommodating cylinder,
The gas outlet of the air accumulator is connected after pressure reducing valve, pressure regulator and pressure gauge with the air inlet of accommodating cylinder upper end；Holding
Set the upper end of cylinder and further respectively have upper binding post and lower binding post on the downside of conductive sheet, the upper end of the lower binding post with lead
Electric piece is fixedly connected, and downside passes through bottom plate；The anode of the DC power supply is connected with upper binding post, cathode and lower binding post phase
Even；
Also be distributed with two wire columns up and down on the side wall of accommodating cylinder, the positive and negative anodes of the high sensitivity electric bridge respectively with two conducting wires
Column is connected.
Further, an O-ring seal is additionally provided between diaphragm to be measured and ring flange.
Further, the conductive sheet is graphite flake or copper sheet.
Further, on bottom plate, the position of corresponding lower binding post is equipped with via hole, and the lower end of the lower binding post is from the mistake
Hole passes through.
Further, the gas filled in the air accumulator is nitrogen.
Further, the highly sensitive electric bridge uses multimeter.
Film is impregnated with the method for pressure value during a kind of Sensitive Detection membrane distillation, it is characterised in that: utilizes any of the above-described power
Benefit requires the device, the specific steps of which are as follows:
1) diaphragm to be measured film is installed to be impregnated on test suite；
2) electrolyte solution is injected into accommodating barrel by liquid injection port, until electrolyte solution will be between accommodating barrel and diaphragm to be measured
Space fill up；
3) DC power supply is connected, test suite power supply is impregnated with to film by DC power supply；
4) gas storage tank valve and pressure reducing valve are opened；
5) pressure regulator is adjusted, air pressure is gradually increased with the increment of 5kPa, wherein each pressure value continues 30s；
6) highly sensitive electric bridge is observed, when the electrical parameter of its display has obvious fluctuation, the reading of record pressure gauge at this time；The reading
Number is the maximum operating pressure value that diaphragm is able to bear in membrane distillation system；
7) step 1) -6 is repeated several times), to be verified to the pressure value that step 6) measures.
Further, the electrolyte solution is the NaCl solution that concentration is 20%.
Further, the electrical parameter is electrical impedance, capacitor or voltage.
Further, when the electrical parameter fluctuation is more than or equal to 10%, it is considered as obvious fluctuation.
Compared with prior art, the present invention has the advantage that
1, present apparatus structure is simple, has the advantages that occupy little space, structure is simple, easy to operate.
2, the device is easy to operate, can reflect film electrowetting phenomenon by the electrical parameters detection of membrane module, with sensitive capture
Liquid immersion phenomenon on membrane material in macropore, thus it is sensitiveer, accurately capture on diaphragm (material) maximum fenestra hair
The operating pressure of system when raw liquid immersion；And then quick and precisely indicate that system can bear maximum operating pressure.
3, the device performance is stable, reproducible, can guarantee the accuracy and credibility of experimental result.
4, the device uses the electrical parameter of membrane module for the first time parameter detects film electrowetting phenomenon in response, has height
Sensitivity and novelty are spent, and response parameter value is convenient for observing and recording.
5, the detection method has the advantages that test fenestra range is wide, can be 0.01um- to size distribution on film
The fenestra of 0.5um, which soaks, carries out sensitive, quick detection.
6, detection method is simple, quick, when can quickly detect maximum fenestra generation liquid immersion on diaphragm (material)
The operating pressure of system, to greatly improve detection efficiency.
7, the detection method has the advantages that at low cost, small investment, and various accessories needed for the device are conveniently easy to get.
8, the detection method has the advantages that income is big, and system when liquid immersion occurs for maximum fenestra on diaphragm (material)
The testing result of operating pressure will greatly improve membrane distillation and test the accuracy efficiently separated, be conducive to process stabilizing operation
And effluent quality can be ensured to a certain extent, while avoiding real caused by experimental implementation is soaked due to membrane module in the process
Test failure.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of device in the present invention.
Fig. 2 is the structural schematic diagram that film is impregnated with test suite in the present invention.
In figure: 1-air accumulator, 2-films are impregnated with test suite, and 3-DC power supplies, 4-highly sensitive electric bridges, 5-is to be measured
Diaphragm, 6-accommodating cylinders, 7-ring flanges, 8-bottom plates, 9-conductive sheets, 10-liquid injection ports, 11-air inlets, 12-pressure reducing valves,
13-pressure regulators, 14-pressure gauges, 15-upper binding posts, 16-lower binding posts, 17-wire columns, 18-O-ring seals.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment: referring to Fig. 1, Fig. 2, film is impregnated with the device of pressure value, including storage during a kind of Sensitive Detection membrane distillation
Gas tank 1, film are impregnated with test suite 2, DC power supply 3, highly sensitive electric bridge 4 and diaphragm to be measured 5.The film is impregnated with test suite
2 include the accommodating cylinder of the open metal material in a upper end closed lower end and the bottom plate 8 that will accommodate cylinder lower end closed.In accommodating cylinder
Outside lower end is arranged with a ring flange 6, which is metal material, and is fixedly connected with accommodating cylinder；Ring flange 6 and accommodating
Cylinder is all made of metal material, to have good conductive property, is conducive to the detection of the electrical parameter in detection process.It is practical to add
Working hour, the ring flange 6 are molded as one with accommodating cylinder, and the downside of ring flange 6 is concordant with the accommodating lower end surface of cylinder；In this way,
It is more convenient for the installation of diaphragm 5 to be measured.
The bottom plate 8 is isolation material, and is connected by connecting bolt with ring flange 6；The diaphragm to be measured 5 is located at flange
Between disk 6 and bottom plate 8, and cylinder lower end closed will be accommodated.A conductive sheet 9 is equipped between diaphragm 5 to be measured and bottom plate 8, and should be to
Diaphragm 5 is surveyed to separate conductive sheet 9 and the lower end of ring flange 6 and accommodating cylinder.In this way, since diaphragm 5 to be measured is usually isolation material,
Accommodating barrel and ring flange 6 are separated with conductive sheet 9 by diaphragm 5 to be measured, so as to effectively avoid 9 direct conduction of conductive sheet.
When it is implemented, being additionally provided with an O-ring seal 18, between diaphragm 5 to be measured and ring flange 6 so as to avoid in accommodating cylinder
Solution leakage, influences the accuracy and stability of detection.Wherein, the conductive sheet 9 is graphite flake or copper sheet；Electric conductivity is more
It is good, and cost is cheaper.
It is equipped with liquid injection port 10 and air inlet 11 in the upper end of accommodating cylinder, the liquid injection port 10 is used to inject electricity into accommodating cylinder
Electrolyte solution；The gas outlet of the air accumulator 1 after pressure reducing valve 12, pressure regulator 13 and the pressure gauge 14 with accommodating cylinder upper end
Air inlet 11 is connected.The gas filled in the air accumulator 1 is nitrogen；Since nitrogen is inert gas, it is not easy to occur with solution
Reaction, therefore pressurizeed using nitrogen, it can be avoided and testing result is impacted, keep testing result accuracy higher.?
It accommodates the upper end of cylinder and further respectively has upper binding post 15 and lower binding post 16, the lower binding post 16 in the downside of conductive sheet 9
Upper end be fixedly connected with conductive sheet 9, downside pass through bottom plate 8.During actual processing, on bottom plate 8, corresponding lower binding post 16
Position be equipped with via hole, the lower end of the lower binding post 16 passes through from the via hole, in this way, assembly is more convenient, quick.It is described straight
The anode in galvanic electricity source 3 is connected with upper binding post 15, and cathode is connected with lower binding post 16.
Two wire columns 17, the positive and negative anodes difference of the high sensitivity electric bridge 4 is also distributed with up and down on the side wall of accommodating cylinder
It is connected with two wire columns 17.When it is implemented, the high sensitivity electric bridge 4 uses (high sensitivity) multimeter, and it is easy to operate, it reads
Number is accurately, conveniently.
In detection process, using air accumulator 1(nitrogen gas tank) method of the pressurization of test suite 2 is impregnated with to film as pressure source；
Moulding pressure is controlled by pressure reducing valve 12, is finely tuned by pressure regulator 13, and is read by pressure gauge 14.Film is impregnated with test group
It is full of electrolyte in part 2, is impregnated with sealing part below test suite 2 in film and places diaphragm 5 to be measured, place and lead below diaphragm 5 to be measured
Electric piece 9.It pressurizes in this way, being impregnated with test suite 2 to the film full of electrolyte being sealed, can make to be electrolysed when film surface pressure reaches
Liquid passes through diaphragm 5 to be measured and when contacting with conductive sheet 9, if be added at this time film be impregnated with test suite 2 highly sensitive electric bridge 4 it is aobvious
Showing the electrical parameter (electrical impedance, capacitor, voltage) that film is impregnated with test suite 2 has obvious fluctuation (the data model more than or equal to 10%
Enclose), i.e., solution is impregnated with phenomenon and has occurred in the maximum fenestra of instruction.Correspondingly, test loop is switched on and (is full of in fenestra at this time
High concentration salt solutions are good conductor, and the fenestra is conductive after being impregnated with).The reading of pressure gauge 14 can obtain film and is impregnated with pressure record at this time
Value.
Present apparatus structure is simple, can reflect film electrowetting phenomenon by the electrical parameters detection of membrane module, with sensitive capture film
Liquid immersion phenomenon on material in macropore, thus it is sensitiveer, accurately capture on diaphragm (material) maximum fenestra and occur
The operating pressure of system when liquid immersion；And then quick and precisely indicate that system can bear maximum operating pressure.
Film is impregnated with the method for pressure value during a kind of Sensitive Detection membrane distillation, utilizes above-mentioned device, specific steps
It is as follows:
1) diaphragm 5 to be measured film is installed to be impregnated on test suite 2.
2) electrolyte solution is injected into accommodating barrel by liquid injection port 10, until electrolyte solution is by accommodating barrel and film to be measured
Space between piece 5 is filled up.Wherein, the electrolyte solution is the NaCl solution that concentration is 20%；Electric conductivity is more preferable, can
The quickly and accurately state that detection membrane is impregnated with.
3) DC power supply 3 is connected, test suite 2 is impregnated with to film by DC power supply 3 and is powered；Due to electrolyte solution at this time
It is not permeated from diaphragm 5 to be measured, film is impregnated with test suite 2 and is in off state, therefore the data that highly sensitive electric bridge 4 detects are
Zero or very small.
4) 1 valve of air accumulator and pressure reducing valve 12 are opened.
5) pressure regulator 13 is adjusted, air pressure is gradually increased with the increment of 5kPa, wherein each pressure value continues 30s.
6) highly sensitive electric bridge 4 is observed, when the electrical parameter of its display has obvious fluctuation, the reading of record pressure gauge 14 at this time
Number；The reading is the maximum operating pressure value that diaphragm is able to bear in membrane distillation system；Wherein, the electrical parameter is resistance
Anti-, capacitor or voltage.When the electrical parameter fluctuation is more than or equal to 10%, it is considered as obvious fluctuation.When diaphragm 5 to be measured permeates
When, electrolyte solution is contacted with conductive sheet 9, at this point, to be impregnated with test suite 2 in the conductive state for entire film, passes through high sensitivity
Electric bridge 4 is just able to detect electrical parameter when place's energized state, and when electrical parameter would generally be far longer than open circuit detects
Electrical parameter.
7) step 1) -6 is repeated several times), to be verified to the pressure value that step 6) measures.
This method detection method is simple, quick, can quickly detect maximum fenestra on diaphragm (material) and liquid leaching occurs
The operating pressure of system when thoroughly, to greatly improve detection efficiency.
Finally, it should be noted that technical side the above examples are only used to illustrate the technical scheme of the present invention and are not limiting
Case, those skilled in the art should understand that, modification or equivalent replacement of the technical solution of the present invention are made for those, and
The objective and range for not departing from the technical program, are intended to be within the scope of the claims of the invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811543492.3A CN109443996B (en) | 2018-12-17 | 2018-12-17 | Device and method for sensitively detecting membrane permeation pressure value in membrane distillation process |
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| CN201811543492.3A CN109443996B (en) | 2018-12-17 | 2018-12-17 | Device and method for sensitively detecting membrane permeation pressure value in membrane distillation process |
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| CN109443996B CN109443996B (en) | 2021-07-02 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110975627A (en) * | 2020-01-20 | 2020-04-10 | 重庆大学 | Micro electric field assisted direct contact membrane distillation device and sewage treatment method |
| CN111189775A (en) * | 2020-02-17 | 2020-05-22 | 冠昊生物科技股份有限公司 | Biomembrane adhesion detection device and detection method |
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| CN111189775A (en) * | 2020-02-17 | 2020-05-22 | 冠昊生物科技股份有限公司 | Biomembrane adhesion detection device and detection method |
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| CN109443996B (en) | 2021-07-02 |
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Effective date of registration: 20211223 Address after: 401329 No. 1-1, building 4, No. 39 Xinggu Road, Jiulongpo District, Chongqing Patentee after: CHONGQING GREEN ENVIRONMENT PROTECTION TECHNOLOGY CO.,LTD. Address before: 400044 No. 174 Sha Jie street, Shapingba District, Chongqing Patentee before: Chongqing University |
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Application publication date: 20190308 Assignee: Lversheng (Chongqing) Environmental Technology Co.,Ltd. Assignor: CHONGQING GREEN ENVIRONMENT PROTECTION TECHNOLOGY CO.,LTD. Contract record no.: X2024980017416 Denomination of invention: A device and method for sensitive detection of membrane permeation pressure during membrane distillation process Granted publication date: 20210702 License type: Common License Record date: 20241012 |
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Denomination of invention: A device and method for sensitive detection of membrane permeation pressure during membrane distillation process Granted publication date: 20210702 Pledgee: Agricultural Bank of China Co.,Ltd. Chongqing High tech Industrial Development Zone Branch Pledgor: CHONGQING GREEN ENVIRONMENT PROTECTION TECHNOLOGY CO.,LTD. Registration number: Y2024980060704 |