CN117937975A - Friction nano generator, friction electric anion generator, and method and application thereof - Google Patents
Friction nano generator, friction electric anion generator, and method and application thereof Download PDFInfo
- Publication number
- CN117937975A CN117937975A CN202311766383.9A CN202311766383A CN117937975A CN 117937975 A CN117937975 A CN 117937975A CN 202311766383 A CN202311766383 A CN 202311766383A CN 117937975 A CN117937975 A CN 117937975A
- Authority
- CN
- China
- Prior art keywords
- friction
- ceramic membrane
- negative ion
- generator
- ion generator
- 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.)
- Pending
Links
- 150000001450 anions Chemical class 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000012528 membrane Substances 0.000 claims abstract description 111
- 239000000919 ceramic Substances 0.000 claims abstract description 80
- 150000002500 ions Chemical class 0.000 claims abstract description 80
- 239000000428 dust Substances 0.000 claims abstract description 43
- 238000005096 rolling process Methods 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 31
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 25
- 238000004140 cleaning Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000004800 polyvinyl chloride Substances 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 5
- 239000004917 carbon fiber Substances 0.000 claims description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 5
- 230000002776 aggregation Effects 0.000 claims description 4
- 238000009285 membrane fouling Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910001080 W alloy Inorganic materials 0.000 claims description 3
- 238000005054 agglomeration Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 23
- 230000004907 flux Effects 0.000 abstract description 13
- 239000007789 gas Substances 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 230000005012 migration Effects 0.000 abstract description 4
- 238000013508 migration Methods 0.000 abstract description 4
- 230000008929 regeneration Effects 0.000 abstract description 4
- 238000011069 regeneration method Methods 0.000 abstract description 4
- 239000002912 waste gas Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000005374 membrane filtration Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000003344 environmental pollutant Substances 0.000 description 7
- 238000011010 flushing procedure Methods 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010170 biological method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000011345 viscous material Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000005653 Brownian motion process Effects 0.000 description 1
- 101100145155 Escherichia phage lambda cIII gene Proteins 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002255 enzymatic effect Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 229920001821 foam rubber Polymers 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Abstract
The invention relates to the technical field of membrane filtration, and discloses a friction nano generator, a friction electric anion generator, a method and application thereof. The friction electronegative ion generator comprises a roller coupling rolling belt type friction nano generator (RCB-TENG), a power management circuit and a negative ion generator. The RCB-TENG can collect the kinetic energy of the waste gas of the gas in the circular pipeline at the outlet of the ceramic membrane filter, and the power supply management circuit is used for circuit pressurization to convert the collected energy into high-voltage electric energy for excitation of the negative ion generator to generate negative ions. The dust and the negative ions are in inelastic collision, so that the charge characteristic, the particle size and the migration characteristic are changed. The accumulation and capture effect on the surface of the ceramic membrane is enhanced, the inertial collision and diffusion capture effect inside the ceramic membrane is weakened, the pressure drop rate is reduced by 51.2%, the flux reduction rate is reduced by about 78.1%, the membrane regeneration efficiency reduction rate is slowed down by 67.8%, and the ceramic membrane pollution is remarkably relieved.
Description
Technical Field
The invention relates to the technical field of membrane filtration, in particular to a friction nano generator, a friction electronegative ion generator, a preparation method and application of TENG thereof and a test bed.
Background
Air pollution is one of the serious problems facing the world today, and causes great harm to human health and ecological environment. Currently, one of the main sources of air pollution is exhaust gas pollution generated during industrial production. The ceramic membrane is a filtering material commonly used in the industrial production process, has the advantages of high temperature resistance, corrosion resistance, abrasion resistance and the like, but is easily blocked by pollutants in the use process, so that the filtering efficiency is reduced. Therefore, how to effectively remove the pollutants on the ceramic membrane and improve the filtering efficiency is a hot spot problem in the current research.
At present, methods for removing ceramic membrane pollution mainly comprise physical, chemical and biological methods. The physical method is to remove the pollutants on the ceramic membrane by mechanical, electromagnetic and other means, such as ultrasonic cleaning, electrolytic cleaning and the like. The chemical method is to decompose and remove the pollutants on the ceramic membrane by using chemical agents, such as acid washing, alkali washing and the like. Biological methods utilize the adsorption, decomposition and degradation capabilities of organisms to contaminants, such as microbial cleaning, enzymatic cleaning, and the like. The physical method and the chemical method have better cleaning effect, but are limited in practical application due to complex operation and high cost. The biological method has simple operation and low cost, but has poor cleaning effect.
In the application process of the membrane technology, substances to be separated can be adsorbed and adhered with the membrane material, so that the permeability, flux and other filtering performances of the membrane are affected, and the service life of the membrane material is reduced. At present, membrane pollution control is mainly carried out by combining a hydrodynamic method (mechanical scraping and back flushing) and a chemical method, and the conventional methods not only can damage the structure of a membrane material, but also have the defects of high cost, complex operation and the like. The membrane modification method is also an important way for controlling membrane pollution, and the core mechanism is to reduce the interaction force (such as adsorption or adhesion) between pollutants and the surface of the membrane through surface modification, and the mode has the problems of sacrificing the mechanical strength, the service life and other performances of the membrane material. The strategies for controlling membrane pollution are all improved from the regulation and control of membrane material surface interfaces, and the interaction mechanism of the particle pollutants and the ceramic membrane interfaces can be improved by regulating and controlling the migration characteristics of the particle pollutants, so that the method has extremely important significance for constructing membrane pollution control.
Disclosure of Invention
The invention provides a triboelectric anion generator, a preparation method and application thereof, and aims to overcome the defects that the adhesion of an object to be separated and a membrane material in the prior art affects the permeability, flux and other filtering performances of the membrane and can reduce the service life of the membrane material;
another object of the present invention is to provide a friction nano-generator;
It is another object of the present invention to provide a method of controlling ceramic membrane fouling;
Another object of the present invention is to provide an industrial grade test stand.
In order to solve the technical problems, the technical scheme of the invention is as follows:
A friction nano generator is a roller coupling rolling belt type structure and comprises a shell, an impeller, a friction device and a rolling bearing;
the friction device comprises a rotor and a stator;
the rotor comprises a bottom plate, a buffer layer, an anode and a cathode and a friction layer; the bottom plate is cylindrical, the surface of the bottom plate is covered with a buffer layer, positive and negative electrodes are uniformly distributed on the buffer layer at equal intervals, and the surface of the positive and negative electrodes is covered with a friction layer;
The stator comprises a rolling belt, a metal layer, a film and a carrier roller; two ends of the two carrier rollers are fixed on the shell, the carrier rollers are provided with rolling belts, the outer parts of the rolling belts are covered with films, and a metal layer is arranged between the rolling belts and the films;
the impeller is fixed in the rotor, and the rotor is driven to rotate by the impeller; the rotor is provided in the stator through the rolling bearing, the rotor is abutted against the stator, and the rotor can freely rotate.
The invention utilizes the negative ion generator based on the triboelectric effect to efficiently control the pollution of the ceramic chamber. Specifically, the friction nano generator can collect the kinetic energy of the waste gas of the gas in the circular pipeline at the outlet of the ceramic membrane filter, convert the kinetic energy into high-voltage electric energy and supply power for the negative ion generator to generate a large amount of negative ions. The particle size of fine dust to be filtered in an inlet pipeline of the ceramic membrane filter is increased after the fine dust to be filtered is combined with negative ions, collide and the like to cause electric agglomeration. When the dust with large particle size migrates to the surface of the ceramic membrane under the action of pressure, the dust can be trapped on the surface of the ceramic membrane, so that the number of curved pore channels entering the membrane layer is reduced, and the pollution of the ceramic membrane is slowed down.
Preferably, the number of stators is one or more. The number of the stators is 2-6.
Further, the material of the friction layer includes a material having a triboelectric series that tends toward a "positive" direction;
The material of the film comprises Polytetrafluoroethylene (PTFE) and polyvinyl chloride (PVC); the thickness of the film is 0.01-0.05 mm;
preferably, the material of the film is polytetrafluoroethylene; the anode and the cathode are made of metal, including copper and aluminum.
Preferably, the film thickness is 0.05mm;
The independent friction layer of the friction device mainly comprises a friction layer material and a metal material, namely a friction layer of a rotor, positive and negative electrodes, a film of a stator and a metal layer.
When the gas flows through the impeller, the rotor is driven to rotate, the rolling belt moves relatively with the rotor, and periodic contact and separation between the film and the friction layer occur. Due to the difference in electron-withdrawing ability of the triboelectric material, electrons move from the tribolayer to the film, resulting in an increase in the potential of the surface of the metal material on one side, this difference in potential leading to the accumulation of charge and the formation of current.
A friction electric negative ion generator comprises the friction nano generator, a power management circuit and a negative ion generator; the friction nano generator is electrically connected with the negative ion generator; the power management circuit is used for controlling the friction nano generator and the negative ion generator.
Further, the power management circuit comprises n capacitors Cn and n rectifying diodes Dn, wherein n is more than or equal to 10 and less than or equal to 25.
Preferably, n is 10.ltoreq.n.ltoreq.20;
preferably, said n=20;
preferably, the maximum withstand voltage value of the capacitor is 3-10 kV, and the capacity is 1nF; the maximum breakdown voltage of the rectifier diode is 10kV;
preferably, the maximum withstand voltage of the capacitor is 10kV.
Further, the emission head of the negative ion generator comprises a carbon fiber electrode and a tungsten alloy electrode;
Preferably, the emission head of the negative ion generator is a carbon fiber electrode.
A preparation method of a triboelectric negative ion generator comprises the following steps:
(1) Preparing a friction nano generator;
(2) Preparing a power management circuit;
① A voltage multiplication circuit is adopted;
② Fixing the capacitor and the rectifier diode on the circuit board;
③ Is connected through a wire;
(3) Connection
The output end of the friction nano generator is connected with a power management circuit, and the output end of the power management circuit is connected with a negative ion generator.
The application of a triboelectric negative ion generator is used for controlling ceramic membrane pollution.
Further, a method for controlling ceramic membrane filter contamination comprising the steps of:
(1) A friction nano generator is arranged on an air outlet pipeline of the ceramic membrane filter;
(2) The emission head of the negative ion generator is placed in a pipeline where dust enters the ceramic membrane filter.
A method of controlling ceramic membrane contamination using the triboelectric negative ion generator; when the friction electric anion generator operates, the rotating speed of the friction device is 200-600 r/min.
The rotating speed of the friction device is 200-600 r/min during operation;
preferably, the rotating speed is 400-500 r/min;
Preferably, the rotational speed is 500r/min.
An industrial-grade test bed comprises the friction electronegative ion generator and an industrial-grade filter membrane pipeline filtering system;
the industrial grade filter membrane pipeline filtration system comprises: the device comprises a ceramic membrane filter, a dust generation bin, a control platform, a pulse back-blowing cleaning device and power auxiliary equipment;
The device is characterized in that a power auxiliary device is connected to an air outlet at the upper part of the ceramic membrane filter through a pipeline, a dust generation bin is connected to a dust inlet at the lower part of the ceramic membrane filter through a pipeline, a pulse back-blowing cleaning device is connected to a top port of the ceramic membrane filter, a friction electric negative ion generator is connected to a dust inlet pipeline of the ceramic membrane filter, and a detection probe and a display device are arranged on a control platform and used for monitoring data in real time.
Preferably, the pulse back-flushing cleaning device comprises an air compressor, an electromagnetic pulse valve, a PU spring air pipe and a circular nozzle;
preferably, the power assist device includes an exhaust fan and a frequency converter.
The invention innovatively designs the friction electric negative ion generator, the kinetic energy of the waste gas is collected through the impeller and is converted into electric energy to drive the negative ion generator, and after the elastic force and the supporting force are introduced into the friction device, the output is obviously improved. The invention innovatively utilizes the negative ion generator for controlling ceramic membrane pollution. The negative ions generated by the negative ion generator collide with the dust particles in a non-elastic way, so that the electric characteristics of the surfaces of the dust particles are changed. Strong Brownian motion exists among the charged dust particles to promote aggregation and agglomeration. The particle size and morphology of the dust particles change to form large-sized spherical or chain-shaped new particle aggregates, and the large particles are directly settled. Large particle agglomerates tend to migrate to the membrane surface due to enhanced membrane surface entrapment. The inertial collision effect and diffusion interception effect in the membrane are weakened, and the pore channel blockage of the ceramic membrane is reduced.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
(1) The invention realizes high-efficiency control of ceramic membrane pollution in the air outlet pipeline of the ceramic membrane filter. High concentrations of smoke exceeding 999 mug/m 3 in 6000cm 3 of enclosed space can be completely settled within 60 seconds. The invention can also obviously reduce the pressure drop rate and flux reduction rate of the ceramic membrane, the change rate of the membrane pressure drop is reduced by 51.2%, the flux reduction rate of the membrane is reduced by 78.1%, the reduction rate of the membrane regeneration efficiency is slowed down by 67.8%, and the pollution problem of the ceramic membrane is effectively relieved.
(2) The triboelectric anion generator of the present invention exhibits good stability and durability. The mass loss of the friction device is reduced by 97.5 percent every 10,000 cycles; the output voltage after 35,000 cycles was maintained at 97.9% and the temperature of the surface of the individual friction layer was increased by only 10.5 ℃ after 500 seconds of continuous operation. Each component can run for a long time and maintain higher performance, and the reliability and long-term stable operation of the system are ensured.
(3) According to the roller coupling rolling belt type friction nano generator (RCB-TENG), elastic force and supporting force are introduced between the roller and the friction layer, so that the dependence of a rolling belt structure on a viscous material is effectively relieved, the advantage of low surface abrasion of the friction layer material is maintained, and the output performance of the friction nano generator is remarkably improved.
(4) The power management circuit adopts a voltage multiplication circuit, the output voltage rises to 2420V, and the number of negative ions generated in 3 seconds is 9 multiplied by 10 7/cm 3 in a 800cm 3 closed space. The efficient energy conversion is realized, the output efficiency of the negative ion generator can be improved to the greatest extent, and the stable work of the negative ion emission head is ensured.
(5) The invention adopts the anion generator to generate anions, the quantity of the anions generated after 3s emission is not less than 9 multiplied by 10 7/cm 3, the dust particle size is increased to 7.64 mu m, the interception effect of the ceramic membrane surface is enhanced, and the charged and agglomerated large particles are easy to intercept. Because the inertial collision effect and the diffusion interception effect in the ceramic membrane are weakened, particles are reduced to enter the membrane, the blocking degree of the membrane pore canal is reduced, and the membrane pollution process is effectively slowed down.
(6) The invention realizes the control of ceramic membrane pollution by using the triboelectric effect and the anion generator technology, does not need to use chemical agents or high-energy consumption equipment, has lower energy consumption and environmental impact, and meets the requirement of sustainable development.
Drawings
FIG. 1 is a schematic diagram of a triboelectric anion generator controlling ceramic membrane fouling, wherein a 1-roller coupled rolling belt type triboelectric nano-generator, a 2-anion generator, a 3-power management circuit, a 4-ceramic membrane filter;
FIG. 2 is a schematic diagram of the structure of an RCB-TENG friction device, wherein 11-film, 12-metal layer, 13-rolling belt, 14-friction layer, 15-positive and negative electrodes, 16-buffer layer, 17-bottom plate;
FIG. 3 is a schematic view of an industrial grade test stand wherein a 4-ceramic membrane filter, a 5-air compressor, a 6-control platform, a 7-dust generation bin, an 8-exhaust fan, a 9-triboelectric anion generator;
FIG. 4 shows the output performance of a friction device of different film materials, (a) is open circuit voltage, (b) is short circuit current, and (c) is output charge amount;
fig. 5 shows the output performance of the friction device at different speeds, (a) open circuit voltage, (b) short circuit current, and (c) charge accumulation over time;
Fig. 6 shows the output performance of the friction device with different film thicknesses, (a) open circuit voltage, (b) short circuit current, and (c) output charge amount;
FIG. 7 is a schematic illustration of a sliding and roller-coupled rolling belt friction device;
FIG. 8 is voltage output performance of friction device CR mode (a) and RCB mode (b);
FIG. 9 is the friction loss for the CR mode and RCB mode of the friction device; (a) is the mass loss of material, (b) is the voltage output contrast, (c) is the SEM image of the film surface;
FIG. 10 is an equivalent circuit diagram and stable output voltage for RCB-TENG driving various circuits, (I) Villard circuit with C TENG, (II) driving Villard circuit, (III) driving voltage multiplier circuit;
FIG. 11 is a graph showing the number of negative ions generated by the negative ion generator under the RCB-TENG driving of different circuits;
FIG. 12 is a dual channel output schematic of a voltage multiplier circuit;
FIG. 13 is a graph showing the number of negative ions generated at single/dual channel output;
FIG. 14 is a graph showing the number of negative ions generated by different negative ion generator emitters;
FIG. 15 shows the settling effect of a triboelectric anion generator on soot, (a) RCB-TENG device, (b) dust settling effect;
FIG. 16 shows the effect of a triboelectric anion generator on ceramic membranes, (a) ceramic membrane differential pressure variation, (b) ceramic membrane flux variation;
FIG. 17 shows the change in pressure drop of the ceramic membrane in the dust removal blowback test, (a) when no triboelectric anion generator is added, (b) when a triboelectric anion generator is added;
Fig. 18 shows the particle size distribution of dust on the surface of the ceramic film before and after the addition of the triboelectric anion generator.
Detailed Description
The invention will be further illustrated with reference to the drawings and specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
The triboelectric anion generator of the present invention, as shown in FIG. 1, mainly comprises a roller-coupled rolling belt type triboelectric nano-generator (RCB-TENG) 1, a Power Management Circuit (PMC) 3, and an anion generator (iNGs) 2.
The triboelectric anion generator is connected with the ceramic membrane filter 4, and the anion generator 2 emits anions in the ceramic membrane filter dust inlet pipeline (at a). The RCB-TENG is used for collecting the kinetic energy of the exhaust gas of the gas in the circular pipeline at the outlet of the ceramic membrane filter, the PMC is used for circuit pressurization, and the collected energy is converted into high-voltage electric energy which is iNGs to be powered and excited to generate negative ions. At the position A, after the tiny dust and negative ions are in inelastic collision, the charge characteristics, particle size, morphology evolution rule and migration characteristics of dust particles are changed, so that the interception and capture effect of the surface of the membrane is enhanced, the inertia collision and diffusion and capture effects inside the membrane are weakened, and finally the membrane pollution control is realized.
In order to verify the actual engineering effect of controlling the pollution of the ceramic membrane, a set of industrial-grade test bed is designed and built, and a dust removal blowback experiment is carried out. The industrial test bed mainly comprises a ceramic membrane filter 4, a pulse back-flushing cleaning device and power auxiliary equipment, as shown in figure 3.
The dust generation bin 7 provides dust for the filter tube, and in order to meet the actual factory conditions, the invention selects fly ash for experiments, and the filter element of the ceramic membrane filter 4 is an inorganic ceramic membrane.
The pulse back flushing device comprises an air compressor 5 (CAT, 0.5 MPa), an electromagnetic pulse valve (DMF-Z-20), a PU spring air pipe (d=13 mm) and a circular nozzle (d=10 mm). An exhaust fan 8 (DF-2-5-1 type) for providing power to the whole system is arranged at the air outlet, and a frequency converter (VFD-M three-phase type) is arranged in front of the exhaust fan for regulating the air flow speed, wherein the power auxiliary equipment of the system consists of the following components. The control platform 6 is provided with a detection probe and a display device for monitoring data such as pressure difference and flux of the ceramic membrane in real time. The triboelectric negative ion generator 9 is connected with the dust inlet pipeline of the ceramic membrane filter, so that the actual engineering effect can be tested.
The triboelectric anion generator is prepared by the following scheme:
(1) Manufacturing a roller coupling rolling belt type friction nano generator:
a. preparing a rotor part:
An acrylic cylinder with a diameter of 19cm and a height of 20cm was prepared as a rotor base plate 17, a layer of 0.25cm thick foam rubber was covered on the surface of the acrylic cylinder as a buffer layer, and 5×10cm copper flakes were uniformly distributed on the buffer layer 16 as positive and negative electrodes 15. A nylon film of 50 μm thickness was coated on the outer surface of the rotor as the friction layer 14.
B. preparing a stator part:
two unpowered PVC carrier rollers with the diameter of 2.5cm and the length of 24cm are fixed on a shell, a PVC rolling belt 13 with the thickness of 0.2mm is stuck above the carrier rollers, a PTFE film 11 with the thickness of 0.05mm is covered on the outer layer of the PVC rolling belt, and a metal layer 12 with the thickness of 0.1mm is added on the inner side of the PTFE film so as to improve the dielectric constant. 5 stators were prepared.
C. And (3) assembling: the impeller is fixed in the rotor, and the rotor is driven to rotate by the impeller; the rotor is provided in the stator through the rolling bearing, the rotor is abutted against the stator, and the rotor can freely rotate.
(2) Manufacturing a negative ion generator:
a. Selecting a carbon fiber electrode as a negative ion emission head;
b. And the negative ion emission head is connected with the power management circuit and driven by direct current high voltage.
(3) Manufacturing a power management circuit:
a. a voltage multiplication circuit is adopted;
b. a capacitor with the maximum withstand voltage value of 10kV and the capacity of 1nF is selected, and a rectifying diode with the maximum breakdown voltage of 10kV is used for rectifying and boosting;
c. drawing a schematic diagram of the voltage doubling circuit by using circuit design software, and ensuring correct connection and layout;
d. converting the schematic circuit diagram into an actual circuit board layout;
e. Mounting and connecting all components on a circuit board;
f. fixing the element on the circuit board by using a welding technology and connecting the element with the circuit board by a wire;
g. the welding point is ensured to be firm and reliable, and the connecting circuit is correct;
h. packaging and protecting the circuit to prevent the influence of the external environment on the circuit;
i. The double-channel output structure is designed to improve the negative ion generation efficiency;
(4) Assembling a triboelectric ionizer:
The output end of the roller coupling rolling belt type friction nano generator is connected with the negative ion generator, and the negative ion generator is connected with the power management circuit.
(5) Operation
When the device runs, the rotating speed of a friction device of the roller coupling rolling belt type friction nano generator is 500r/min.
Examples 2 to 8
The technical solutions of examples 2 to 8 are similar to the examples, with the differences shown in Table 1.
Table 1 examples 2 to 8
Comparative example 1
Comparative example 1 was not equipped with a triboelectric ionizer.
Comparative examples 2 to 11
Comparative examples 2 to 11 the technical scheme was similar to example 1, except that table 2 was shown.
Table 2 comparative examples 2 to 11 technical solutions
Test method
(1) RCB-TENG friction device output electrical performance test
① The friction devices are connected to a commercial speed regulating motor to provide rotary power, and the open-circuit voltage, the short-circuit current and the output charge of different friction devices at different rotating speeds (the rotating speeds measured by using a commercial laser velocimeter) are measured.
② The rotation speed of the friction device is improved, the output voltage of RCB-TENG after 35,000 cycles, the mass loss after 40,000 cycles and the abrasion condition of the surface of the friction electric material after 80,000 cycles are tested, and the friction surface temperature is continuously operated for 500 seconds.
(2) Measuring the amount of negative ions produced
And quantitatively detecting negative ions by using an ion concentration tester, preparing a roller coupling rolling belt type friction nano device, and configuring different circuits. The sample is placed in a proper experimental environment to ensure the stability of indoor temperature and humidity. And placing a probe of the ion concentration tester in a negative ion emission area output by the device, and recording the test time. And respectively obtaining the number of negative ions generated under different circuits according to the measurement result of the ion concentration tester.
(3) The pollution control effect of the ceramic membrane is tested by using an industrial test bed:
The roller coupling rolling belt type friction nano generator is arranged in an air outlet pipeline of the ceramic membrane filter, the negative ion emission head is placed in the pipeline where dust of the ceramic membrane filter enters, and the roller coupling rolling belt type friction nano generator drives the rotary exhaust to complete system assembly.
And adding the dried fly ash with certain mass into a dust generation bin through a feeding hole, opening a roller coupling rolling belt type friction nano generator switch at the bottom of a control platform, and adjusting power to drive a spiral fan blade to rotate so that the fly ash and air are fully mixed to form dust-containing gas to be filtered. And opening an exhaust fan, introducing dust-containing gas into the ceramic membrane filter under the condition that the control platform adjusts certain power, intercepting fly ash by the ceramic membrane and accumulating the fly ash on the surface of the membrane, and discharging clean gas from an outlet. After filtering for a period of time, the air compressor is turned on, and gas is input into the gas storage tank for subsequent back blowing. And (5) back blowing. When the pressure difference or flux of the system displayed by the control platform reaches an experimental set value, parameters such as back flushing pressure, back flushing duration time and interval time of back flushing times are set through the control platform, and meanwhile data such as the pressure difference, flux and dust particle size of the back-flushed system are recorded, so that the control effect of the system on ceramic membrane pollution is evaluated.
From comparative example 2, the output performance of a pair of friction devices at 200 rpm was measured according to different film materials. As shown in FIG. 4, the open circuit voltage, short circuit current, and output charge of PET were 400V, 5 μA, 0.25 μC, respectively, far lower than 500V, 8 μA, 0.32 μC for PVC and 750V, 10 μA, 0.38 μC for PTFE.
From comparative examples 3 to 4, the output performance of a pair of friction devices at different rotational speeds was tested, and when the rotational speed was increased from 50 to 500 rpm, the open circuit voltage was increased from 500V to about 950V (fig. 5 a), the short circuit current was increased from 4 to 18 μa (fig. 5 b), and the time for the charge amount to reach the electrometer measurement range was reduced from 100s to 16s (fig. 5 c). As can be seen from FIG. 5, when the rotation speed is 50-500 r/min, the rotation speed and the electric output performance are in positive correlation, and when the rotation speed is less than 220r/min, the time for the charge quantity to reach the measuring range of the electrometer is obviously prolonged. When the rotating speed is more than 600r/min, the abrasion degree of the friction device is greatly improved, and in practical application, the generated waste gas cannot provide the kinetic energy reaching the rotating speed.
From comparative examples 5 to 6, it is understood from fig. 6 that when the film thickness is 0.01 to 0.1mm, the output performance of the friction device is inversely related to the film thickness, and when the thickness is 0.08mm, the short-circuit current and the output charge amount are significantly reduced.
In fig. 7, 1 is a sliding friction device, and 2 is a roller-coupled rolling belt friction device. As shown in FIG. 8, the output voltage of RCB-TENG reaches 520V, while RB-TENG is only 250V. With one power generation unit, 40,000 cycle tests were performed using RCB mode and CR mode, respectively (FIG. 9 a), with mass losses per 10,000 cycles of 32 μg/g and 1281 μg/g, respectively, with a 97.5% reduction in friction losses. After 35,000 cycles, the output voltage of RCB-TENG was maintained at 97.9%, which is significantly better than 76.2% of CR-TENG (FIG. 9 b), indicating better stability of the RCB-TENG structure. The wear of the surface of the PTFE material after 80,000 cycles was analyzed by scanning electron microscopy, as shown in FIG. 9 cIII, where the surface of the PTFE material in CR mode was severely worn, while the surface of the material in RCB mode (FIG. 9 cII) was not significantly changed from the initial state (FIG. 9 cI). The relationship between the friction time and the surface temperature under the CR and RCB structures is studied by adopting a thermal imaging camera, the temperature of the surface of the CR-TENG independent friction layer rises by 20.1 ℃ after continuous operation for 500 seconds, and the temperature of the RCB-TENG rises by only 10.5 ℃, which shows that the heat loss in the RCB-TENG mode is small, and the energy conversion efficiency is higher.
Sliding (CR) materials wear out greatly and output stability is weak. From the analysis of the physical stress of the RCB structure, the structure not only has static friction force between interfaces, but also introduces elastic force and supporting force between the rolling belt and the rotor. This design not only reduces the surface wear of the triboelectric material, but also reduces the dependence of the friction layer on the viscous material. Through comparison with the CR mode, the output voltage is obviously improved after the elastic force and the supporting force are introduced, which further verifies that the introduction of the elastic force and the supporting force can effectively enhance the conversion efficiency of the triboelectric.
The driving of the negative ion generator requires high-voltage input, and the output voltage of the circuit not only affects the generation amount of negative ions, but also has important influence on the regulation and control of charge, migration and the like of the fine particle group. The test RCB-TENG drives different circuit output voltages. The test results show that the voltage multiplication circuit is superior to other schemes, and after the alternating current power supply with the initial voltage of 1250V is converted into direct current, the output voltage rises to 2420V (fig. 10). The negative ion concentration change generated under different circuit conditions is tested, and a voltage multiplication circuit scheme is adopted in a closed space of 800cm 3, so that the number of negative ions generated in 3 seconds is 9×10 7/cm 3, which is obviously higher than that of a Villard circuit with C TENG and a Villard circuit (figure 11).
FIG. 12 is a schematic diagram of a dual channel output, where the power supply represents RCB-TENG. The circuit principle of a 20-time booster circuit of an anion generator, wherein the voltage of a first output channel (AB) is the sum of C2, C4 and C20 which are connected in series, and C1, C3 and C19 are connected in series to form a second output Channel (CD). The second output channel series channel voltage is 23750V, which is almost equivalent to the voltage 25000V of the first output channel. The two output channels drive the anion emission head simultaneously, realize the binary channels and export in coordination, greatly improved the electric energy output performance of system. The negative ion emission head is driven by a 10-time booster circuit for the two-channel output and the single-channel output respectively, and when the concentration of negative ions reaches 9×10 7/cm 3 in a container of 7500cm 3 and 20cm away from the negative ion emission source, the two-channel output and the single-channel output respectively need 1.5s and 3s (figure 13).
As can be seen from fig. 14, the number of negative ions generated after the negative ion emitting head for different electrode materials emits for 3s is 9.0x10 7 per cm 3 for the tungsten alloy electrode compared with 6.2x10 7 per cm 3 for the nickel alloy electrode, and is 9.8x10 7 per cm 3 for the carbon fiber electrode.
To investigate the settling effect of triboelectric anion generators on soot, high concentrations of soot exceeding 999 μg/m 3 in 6000cm 3 of enclosed space could be completely settled within 60 seconds using an RCB-TENG device (FIG. 15 a), with a significant advantage over the control experiment without the device (FIG. 15 b).
Differential pressure and flux are generally important indicators for representing the pollution degree of a ceramic membrane, and the faster the differential pressure rises, the faster the flux drops, and the more serious the membrane pollution is, namely the shorter the period for disassembling and cleaning or even replacing a new membrane tube is required. FIG. 16a is a time-dependent change of the pressure difference between the ceramic membranes before and after the addition of the triboelectric anion generator, wherein the change rate of the pressure difference is 0.031 when the system is operated in the original state, the change rate of the pressure difference is 0.015 when the system is operated after the addition, and the pressure drop rate is reduced by 51.2%; fig. 16b is an effect of a triboelectric anion generator on ceramic membrane flux, which was found to significantly decrease the rate of decrease of ceramic membrane flux by about 78.1% after use of the triboelectric anion generator. As can be seen from fig. 17a and 17b, the number of cleaning times was reduced, the residual pressure drop was reduced, and the rate of decrease in the regeneration efficiency of the filtration membrane was slowed down by 67.8% after using the triboelectric anion generator. The friction electronegative ion generator is added to reduce the amount of submicron particles entering the filter, so that the regeneration rate of the ceramic membrane tube is remarkably improved. Fig. 18 shows the particle diameter change of the dust particles on the surface of the ceramic film before and after the addition, the particle diameter of the dust deposited on the surface of the film tube after the addition of the triboelectric anion generator is increased from 4.03 μm to 7.64 μm, which means that the generated anions contribute to the polymerization of the fine particle group, resulting in the change of the particle diameter and the morphology characteristics of the particles. In the invention, the dust is distributed more uniformly on the surface of the ceramic membrane after the particle size of the dust is increased by adding the triboelectric anion generator, and the reason is that after the particle size is increased, loose filter cakes are formed on the surface of large-particle-size particles, which is very beneficial to the back blowing and separating effects of the ceramic membrane.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The friction nano generator is characterized by being of a roller coupling rolling belt type structure and comprising a shell, an impeller, a friction device and a rolling bearing;
the friction device comprises a rotor and a stator;
the rotor comprises a bottom plate, a buffer layer, an anode and a cathode and a friction layer; the bottom plate is cylindrical, the surface of the bottom plate is covered with a buffer layer, positive and negative electrodes are uniformly distributed on the buffer layer at equal intervals, and the surface of the positive and negative electrodes is covered with a friction layer;
The stator comprises a rolling belt, a metal layer, a film and a carrier roller; two ends of the two carrier rollers are fixed on the shell, the carrier rollers are provided with rolling belts, the outer parts of the rolling belts are covered with films, and a metal layer is arranged between the rolling belts and the films;
the impeller is fixed in the rotor, and the rotor is driven to rotate by the impeller; the rotor is provided in the stator through the rolling bearing, the rotor is abutted against the stator, and the rotor can freely rotate.
2. The triboelectric nano-generator according to claim 1, wherein the triboelectric layer comprises a material with a triboelectric sequence towards the "positive" direction;
The film comprises polytetrafluoroethylene and polyvinyl chloride; the thickness of the film is 0.01-0.05 mm;
the anode and the cathode are metals including copper and aluminum.
3. A triboelectric negative ion generator, characterized by comprising the triboelectric nano-generator according to any one of claims 1-2, a power management circuit and a negative ion generator; the friction nano generator is electrically connected with the negative ion generator; the power management circuit is used for controlling the friction nano generator and the negative ion generator.
4. A triboelectric negative ion generator according to claim 3, characterized in that the power management circuit comprises n capacitors Cn and n rectifier diodes Dn, 10.ltoreq.n.ltoreq.25.
5. A triboelectric negative ion generator according to claim 3, characterized in that the emitter of the negative ion generator comprises carbon fiber electrodes, tungsten alloy electrodes.
6. A method of producing a triboelectric negative ion generator according to any one of claims 3 to 5, comprising the steps of:
(1) Preparing a friction nano generator;
(2) Preparing a power management circuit;
① A voltage multiplication circuit is adopted;
② Fixing the capacitor and the rectifier diode on the circuit board;
③ Is connected through a wire;
(3) Connection
The output end of the friction nano generator is connected with a power management circuit, and the output end of the power management circuit is connected with a negative ion generator.
7. Use of a triboelectric negative ion generator according to any one of claims 3-5 for controlling ceramic membrane fouling, comprising the steps of:
(1) A friction nano generator is arranged on an air outlet pipeline of the ceramic membrane filter;
(2) The emitter of the negative ion generator is placed in the pipeline of the dust inlet of the ceramic membrane filter.
8. A method for controlling ceramic membrane pollution, which is characterized in that a negative ion generator is used for generating negative ions, the negative ions are combined and collided with fine dust to be filtered, and the particle size of the ceramic membrane is increased after electric agglomeration; when the dust with large particle size migrates to the surface of the ceramic membrane under the action of pressure, the dust is trapped on the surface of the ceramic membrane.
9. The method of controlling ceramic membrane fouling according to claim 8, characterized in that a triboelectric negative ion generator according to any one of claims 3-5 is used; when the friction electric negative ion generator operates, the rotating speed of a friction device of the friction nano generator is 200-600 r/min.
10. An industrial grade test bed, comprising the triboelectric anion generator of any one of claims 3 to 5 and an industrial grade filter membrane conduit filtration system;
The industrial grade filter membrane pipeline filtration system comprises: the device comprises a ceramic membrane filter, a dust generation bin, a control platform, a pulse back-blowing cleaning device and power auxiliary equipment; the device is characterized in that a power auxiliary device is connected to an air outlet at the upper part of the ceramic membrane filter through a pipeline, a dust generation bin is connected to a dust inlet at the lower part of the ceramic membrane filter through a pipeline, a pulse back-blowing cleaning device is connected to a top port of the ceramic membrane filter, a friction electric negative ion generator is connected to a dust inlet pipeline of the ceramic membrane filter, and a detection probe and a display device are arranged on a control platform and used for monitoring data in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311766383.9A CN117937975A (en) | 2023-12-21 | 2023-12-21 | Friction nano generator, friction electric anion generator, and method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311766383.9A CN117937975A (en) | 2023-12-21 | 2023-12-21 | Friction nano generator, friction electric anion generator, and method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117937975A true CN117937975A (en) | 2024-04-26 |
Family
ID=90761967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311766383.9A Pending CN117937975A (en) | 2023-12-21 | 2023-12-21 | Friction nano generator, friction electric anion generator, and method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117937975A (en) |
-
2023
- 2023-12-21 CN CN202311766383.9A patent/CN117937975A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105797861B (en) | A kind of air cleaning system based on friction generator | |
| CN206483573U (en) | A kind of electrostatic type air purification apparatus and air purifier | |
| JP2011092932A (en) | Electric dust collector and air cleaner containing the same | |
| CN107930851A (en) | A kind of electrostatic precipitator | |
| CN101111318A (en) | Electric dust collector | |
| JP2022508870A (en) | Air dust removal system and method | |
| CN101406785A (en) | Electrostatic-filtering type combined dust-cleaning equipment | |
| CN101376034B (en) | Electrode and circuit of high-efficient air purification device driven by electric dissociation | |
| WO1997023294A1 (en) | Air filtration apparatus | |
| KR102219778B1 (en) | Self-cleaning electrostatic precipitator and air cleaner using thereof | |
| CN117937975A (en) | Friction nano generator, friction electric anion generator, and method and application thereof | |
| CN110691963A (en) | Dust measuring apparatus and method | |
| CN109833977B (en) | Air purifying method and air purifier | |
| CN112523672A (en) | Electrostatic dust removal screen window and preparation method and application thereof | |
| CN104338395A (en) | Electric field cleaning device and method of filtering membrane of air purifier | |
| CN106051912A (en) | Filtering device of plasma air purifier | |
| CN206763140U (en) | It is double to drive board-like electronic dust-collecting purifier | |
| CN104958962A (en) | Plasma air purifer filtration apparstus | |
| KR100613012B1 (en) | Multi-stage device for fine dust agglomeration by using electric forces | |
| CN204380852U (en) | A kind of dust arrester | |
| KR20070075047A (en) | Air cleaner with electrostatic film and air conditioning system including the same | |
| JP2004273244A (en) | Air supply device of fuel cell | |
| KR20040101806A (en) | Method and apparatus for removing the dust by using dielectric barrier discharge | |
| CN218981916U (en) | Self-powered PM2.5 purifying and monitoring device based on hybrid generator | |
| CN220898608U (en) | Dust suction device and cleaning equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication |