CN115591670A - Falling film structure for strengthening removal of micro dust - Google Patents
Falling film structure for strengthening removal of micro dust Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/53—Liquid, or liquid-film, electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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Abstract
The invention discloses a falling film structure for strengthening removal of micro dust, which comprises a support body with mechanical strength and a static electricity layer mainly used for removing small particles; the support body comprises a windward part arranged facing the flowing direction of the fluid and a crosswind part arranged at the side direction of the windward part; the static electricity layer is arranged on the side wind part in a structural form capable of generating electric field acting force on the small particles; and (3) laying water film coatings on the windward part and the static electricity layer to remove the micro dust particles in the fluid. According to the invention, the windward part can realize better removal of large particles by using an inertial collision mechanism, and the side wind part is emphasized to adsorb fine particles to a water film by electrostatic adsorption by using the action of an electric field force, so that the fine particles are removed. The method can greatly improve the removal rate of small particles in the dust while saving energy.
Description
Technical Field
The invention relates to the technical field of dust removal, in particular to a falling film structure for strengthening removal of micro dust.
Background
The traditional dust removal technology comprises mechanical dust removal, electric dust removal, filtration dust removal, wet dust removal and the like. The electrostatic dust collection has high removal rate of small particles, but the energy consumption is too high.
The prior art for removing the micro-dust particles by using industrial wastewater has the prior art before the application, and the purpose of environment protection technology for treating wastes with processes of wastes against one another is achieved. The concrete construction form is as follows: a water film coating layer is paved on the surface of a single cylinder, and a fluid passing area is formed by a plurality of similar cylinders in a staggered arrangement mode. The removal mechanism mainly applied by the technology is inertial collision and Brownian diffusion.
The inertial collision means that when the flow direction of the dust-containing gas is changed by an obstacle, the particles deviate from the gas flow direction and are captured by the obstacle due to the inertia effect, and the inertial collision mainly acts on large particles; and the brownian diffusion mechanism refers to a phenomenon in which small particles in the air are trapped by accidental collisions with a trap due to brownian motion.
However, the stability of the water film in the above technical solutions has a technical drawback of being not stable enough under the impact of the fluid. In order to improve the stability of the resident water film in the windward area and reduce the laying amount of the water film so as to achieve the purpose of reducing energy consumption, the invention of Chinese patent CN110652807B is a non-uniform film falling pipe, unit and device applied to falling film dust removal, and the prior art is improved by arranging the structural form of a film falling groove. The core technical points are as follows: and a film falling groove is arranged in the windward area, so that the effect of film holding and energy saving is achieved.
However, the technical scheme still has the technical defect that the removal rate of small particles in the dust particles is not ideal. In order to improve the small particle removal rate of the side wind part, the Chinese patent CN113797690B discloses a cascade membrane descending column and a device for cross-flow dust removal, which strengthen the structural form of the side wind part and further improve the small particle removal rate.
Although the above technical solutions have fully utilized the inertial collision and brownian motion mechanisms, the application of the dust removing mechanism is only limited to mechanical collision. The mechanical collision mechanism is used for improving the removal rate of small particles in the dust particles, particularly particles with the particle size of less than 1 mu m, and meets the technical bottleneck.
Disclosure of Invention
Therefore, the main technical purpose of the invention is to introduce electric field force to enhance the adsorption of small particles on the basis of ensuring that the energy consumption is still maintained at a low level so as to improve the removal rate of the small particles.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the falling film structure for strengthening the removal of the micro dust comprises a support body with mechanical strength and a static electricity layer mainly used for removing small particles; the support body comprises a windward part arranged facing the flowing direction of the fluid and a crosswind part arranged at the side direction of the windward part; the electret layer is arranged on the side wind part in a structural form capable of generating electric field acting force on small particles; and (3) laying water film coatings on the windward part and the static electricity layer to remove the micro dust particles in the fluid.
The falling film structure forms a dedusting array, and the removal rate of the particles can be theoretically calculated by the following formula:
when 10 -3 ＜K C ＜10 -1 When the temperature of the water is higher than the set temperature,
η C ＝0.78K C (1)
when 10 -1 ＜K C When the ratio is less than 10, the reaction solution is mixed,
wherein eta is C Is the particle removal efficiency affected by coulomb force; h is k Is a hydrodynamic factor; k is C For coulomb force parameters, the expression for the latter two is as follows:
h k ＝-0.5lnα+α-α 2 -0.75 (3)
in the above formula, alpha is the electret bulk density, specifically, the mass of the electret material which can play a role of dust removal when the electret array is uniformly distributed in a unit volume, kg.m -3 。
In the formula, K C Is a coulomb force parameter; q. q.s p Is the particle charge, C; e is elementary charge, C, value 1.6X 10 -19 ；ε 0 Is a vacuum dielectric constant, F.m -1 Value of 8.85X 10 -12 ；ε f Is the dielectric constant of an electret, F.m -1 (ii) a Mu is gas viscosity, pa · s; d p Is the particle size, m; u is gas flow velocity, m.s -1 ；
Is the electret average charge density, C.m -3 The expression is as follows:
in the formula of U F Electret surface potential, V; epsilon m Is the dielectric constant of the material, F.m -1 ；L 0 Is the length of the electret structure, m.
Above a series of formulas is suitable when granule and electret are all electrified, and when the granule is uncharged, when the electret is electrified, the atress that the granule was for the polarizability, then need solve with following formula:
when 10 -4 ＜K In ＜10 -2 When the temperature of the water is higher than the set temperature,
when 10 -2 ＜K In When the ratio is less than 1, the reaction solution is,
when 1 < K In When the frequency is less than 100, the frequency is,
in the formula eta In For particle removal efficiency influenced by polarization force, K In The calculation formula is as follows:
in the formula, epsilon p Is the dielectric constant of the particles, F.m -1 ；d f Is the equivalent diameter, m, of the electret coated on the support.
Preferably, the electret layer comprises an electret layer, a barrier layer; the insulating layer and the electret layer are arranged in a structure that the insulating layer can wrap the electret layer.
Preferably, the electret layer is mainly made of polypropylene.
Preferably, the electret layers form a unitary structure.
Preferably, the isolation layer is mainly made of one or more of hydroxyl acrylate resin, epoxy acrylate resin and polydimethylsiloxane.
Preferably, the electret layer comprises an electret layer and an insulating layer; the mass ratio range of the materials required to be prepared for the electret layer and the isolation layer is as follows: 1-3:1-6.
Preferably, the crosswind portion is provided in an arc shape radially inward of the support body.
Preferably, the crosswind portion is mainly composed of a windward side wall and a stay.
Preferably, a plurality of barb elements are arranged on the wall surface of the side wind part at intervals along the length direction of the support body.
Preferably, the support body is arranged into a mesh rib base body, and the electricity-retaining layer is generated by the mesh rib base body and forms a structural form wrapping the mesh rib base body.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a falling film structure for strengthening removal of micro dust, wherein a static electricity layer is arranged at a side wind part in a structural form capable of generating an electric field acting force on small particles; and laying a water film coating on the windward part and the static electricity layer to remove the micro dust particles in the fluid.
Before this application, prior art reaches dust removal effect through setting up the water film coating at the supporter surface to strengthen the absorption of granule, and take away the granule after the absorption constantly through the water film. Furthermore, in order to reasonably utilize an inertia collision mechanism and a Brownian motion mechanism, a film falling groove is arranged on the support body to enhance the removal rate of the windward part; the side surface of the support body is provided with a side wind part to strengthen the removal rate of fine particles.
Although the prior art can improve the removal rate of small particles to some extent by improving the configuration of the crosswind portion. However, only by means of the improvement of the physical structure, the brownian motion mechanism is used up, and the removal rate of small particles from the crosswind part is difficult to be further improved.
The traditional technology for removing dust by utilizing static electricity has high energy consumption, and the energy consumption mainly comes from high pressure drop caused by a fiber structure.
Therefore, the static electricity layer is arranged at the side air part, the advantage of removing small particles excellently by means of electrostatic dust removal is utilized, the advantage of energy conservation and environmental protection of falling film dust removal is combined, and the technical effect of comprehensively improving the dust removal rate is achieved.
It is worth noting that although the present application takes advantage of the electrostatic precipitation, there is a substantial difference in how to specifically incorporate an electrostatic precipitation structure into a falling film column solution. In the traditional electrostatic dust removal technology, a hair brush structure is usually made of an electret material, a multi-fiber structure is pursued, and the theoretical basis is an inertial collision theory. According to the theory, the traditional thinking is that the larger the specific surface area is, the higher the collision probability is, the higher the removal rate is, and the traditional technology almost has the thinking inertia.
The electret layer is of an integral structure, an inertia collision mechanism is not excessively utilized (the windward part in the application can realize better removal of large-inertia particles, so that the specific surface area does not need to be increased), and the action of the electric field force is only utilized. Through electrostatic adsorption, the fine particles are adsorbed to a water film, and then the fine particles are removed. On the basis that the energy consumption is still maintained at a lower level, the removal rate of the dust particles, particularly the removal rate of submicron particles, is greatly improved.
The invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of a falling film structure and its cross section enlarged in a preferred embodiment of the present invention.
Figure 2 is a schematic view of another falling film configuration and its enlarged cross-section in a preferred embodiment of the present invention.
Figure 3 is a schematic view of another falling film configuration and its enlarged cross-section in a preferred embodiment of the present invention.
Figure 4 is a schematic view of another falling film configuration and its enlarged cross-section in a preferred embodiment of the present invention.
Fig. 5 is a partially enlarged structural view of a portion a in fig. 4.
Figure 6 is a schematic view of another falling film configuration and its cross-sectional enlarged configuration in accordance with a preferred embodiment of the present invention.
Fig. 7 is a schematic structural view of a mesh rib base body in the preferred embodiment of the invention.
Fig. 8 is a schematic perspective view of a falling film structure applied to a dust removing device according to a preferred embodiment of the present invention, wherein the direction of the arrow is the direction of the dust-containing gas flow.
Fig. 9 is a schematic structural view from the side of the apparatus according to the preferred embodiment of the present invention.
Fig. 10 is a schematic view of the top view of the apparatus in accordance with the preferred embodiment of the present invention.
FIG. 11 is a schematic view of the arrangement of the support bodies of the apparatus according to the preferred embodiment of the present invention.
Description of reference numerals:
the wind-resistant insulating layer comprises a 10-support body, a 11 windward part, a 12 side wind part, a 121-residing piece, a 122-barb piece, a 13-mesh rib base body, a 20-residing electric layer, a 21-electret layer and a 22-insulating layer.
Detailed Description
The present invention is further explained and illustrated by the following embodiments, which should be understood to make the technical solution of the present invention clearer and easier to understand, and not to limit the scope of the claims.
The embodiment provides a falling film structure for strengthening removal of micro dust, which comprises a support body 10 and an electret layer 20, wherein the electret layer 20 covers the surface of the support body 10. The support body 10 is used to form a base structure, providing physical support; the charge sustaining layer 20 plays a role of adsorbing the fine dust by the action of the electric field force.
The support body 10 includes a windward portion 11 and a crosswind portion 12; the windward portion 11 is disposed in the direction of the incoming wind of the fluid to be dedusted (e.g., air containing dust); the windward part 11 is mainly used for removing particles with larger inertia in the fluid, and although inertial collision and brownian motion exist in the windward part 11 at the same time, the mechanism of mainly removing the micro-dust in the part is still the inertial collision theory; that is, the windward portion 11 mainly removes particles with larger inertia from the fine dust.
Because the windward part 11 obstructs the fluid flow, the fluid can generate a streaming phenomenon, and therefore, the part of the windward part 11, through which the fluid can flow after streaming, is the side wind part 12; the particles remaining in the crosswind portion 12 are mostly smaller inertia particles, which are removed from the windward portion 11. According to the conventional theory, the main removing mechanism of the part is brownian motion, namely, particles randomly collide with the solid part of the crosswind part 12, and the particles colliding with the solid part of the crosswind part 12 can be removed by falling film. The specific mode is the same as that of a cascade type membrane descending column and a device for cross-flow dust removal in patent CN 113797690B.
Before this application, prior art reaches dust removal effect through setting up the water film coating on supporter 10 surface to strengthen the absorption of granule, and take away the granule after the absorption constantly through the water film.
Further, in order to reasonably utilize an inertial collision mechanism and a brownian motion mechanism, a film falling groove is arranged on the support body 10 to enhance the removal rate of the windward part 11; the side wind part 12 is provided at the side of the support body 10 to enhance the removal rate of fine particles.
Although the prior art can improve the removal rate of small particles to some extent by improving the configuration of the side wind portion 12. However, only by the improvement of the physical structure, the brownian motion mechanism has been exhausted, and it is difficult to further increase the removal rate of the crosswind portion 12.
Therefore, the design concept is provided, the electret layer 20 is arranged on the side air portion 12, the advantage of extremely good small particle removal of electrostatic dust collection is utilized, and the energy-saving and environment-friendly advantages of falling film dust collection are combined, so that the technical effect of comprehensively improving the dust collection rate is achieved.
It is worth noting that although the present application makes use of the advantages of electrostatic precipitation, there are substantial differences in how to specifically incorporate an electrostatic precipitation structure into a falling film column solution.
In the traditional electrostatic dust removal technology, a static electricity material is usually made into a brush structure to pursue a multi-fiber structure, the theoretical basis is an inertia collision theory, and according to the theory, the larger the specific surface area is, the higher the collision probability is, and the higher the removal rate is; this is a mental inertia.
In the present application, the electret layer 20 is an integral structure, and the collision mechanism is not excessively utilized (in the present application, the windward portion 11 can achieve better removal of large inertia particles, so that the specific surface area does not need to be increased), and only the electric field action is mainly utilized; and adsorbing the fine particles to a water film through electrostatic adsorption, and further removing the fine particles.
Specifically, the electret layer 20 structure may be: the electret layer 20 includes an electret layer 21; the electret layer 21 can hold electric charge for a long time by charging, and further maintain an electrostatic field for a long time, the intensity of which is in the range of electrostatic force capable of acting on fine particle removal.
Outside the electret layer 21, an insulating layer 22 may be provided; in actual use, the water-sheeting layer flows over the surface of the insulating layer 22.
The insulating layer 22 can be attached to the outside of the electret layer 21 in a coating manner and fixedly connected with the electret; the insulating layer 22 can prevent the exchange of charges with external substances such as air molecules, water molecules and the like, and has the function of greatly prolonging the maintaining time of electric field force; the isolation layer 22 itself does not block the existence of the electric field, but only blocks the physical substance communication; on the other hand, the isolation layer 22 is made of hydrophobic materials, has a self-cleaning function, and saves the work of cleaning the surface of the support body 10; if used for a long time, dust may accumulate on the surface of the support body 10, and if the insulating layer 22 is provided, dust may accumulate on the surface of the insulating layer 22; therefore, the repelling strength of the insulating layer 22 and the water film coating layer is enhanced, and the self-cleaning effect can be achieved.
Since the water film coating continuously adsorbs dust-laden particles which partially penetrate the water film coating and adhere to the insulating layer 22, the water repellency of the insulating layer 22 is utilized to reduce the adsorption force on the water film coating, thereby achieving a self-cleaning effect.
Specifically, the electret layer 21 may be made of polypropylene, which is a resin prepared by polymerizing propylene as a monomer, and has excellent charge storage capacity and high machinability. The polymerization degree of polypropylene is generally 250-600, and the polypropylene is charged after being solidified into solid by applying a directional electric field when being melted at high temperature.
Specifically, the insulating layer 22 may be mainly made of one or a combination of more of hydroxyl acrylate resin (HA), epoxy acrylate resin (EA), polydimethylsiloxane (PDMS).
Specific preparation method 1 of the charge holding layer 20:
processing a commercially available long rod-shaped electret into granules or powder; the particles or powder are mixed with liquid HA, EA, or PDMS, and then coated on the surface of the side wind part 12, and dried to form a mixed layer of an electret layer 21 and an insulating layer 22, and finally the electret layer 20 is formed.
Specific preparation method 2 of the electret layer 20:
the commercially available long rod-shaped electret is processed into granules or powder and uniformly arranged on the surface of the side wind part 12, then liquid HA, EA or PDMS is coated on the granules, and finally the electret layer 20 is formed on the surface of the side wind part 12 after drying.
Specifically, the two methods comprise the following raw materials in percentage by mass of the insulation layer 22: electret material =1-6:1-3.
Table 1-ability to retard charge decay:
note: the larger the relative dielectric constant is, the smaller the bulk conductivity is, and the stronger the ability of the material to isolate charges from external communication is.
The support body 10 is not limited to the X-shape or the α -shape in the above description; any structure that can exert electrostatic adsorption force and retain the removing action of the windward portion 11 is possible.
Specifically, the windward portion 11 has an open shape.
Specifically, the crosswind portion 12 may be provided in an inwardly concave arc shape.
Specifically, the crosswind portion 12 may be constituted by the windward portion 11 side wall and the stay 121.
Even more, the crosswind portion 12 may be formed by coating only the rear surface of the open windward portion 11 without providing an additional member.
The above describes the shape of the crosswind portion 12 only in the cross-sectional range; furthermore, an improvement can be made in the axial direction of the support body 10:
specifically, in order to enhance the bonding strength between the electret layer 21 and the wall surface of the crosswind portion 12, the barb 122 may be provided on the wall surface of the crosswind portion 12, and the coating formed on the barb 122 by the electret layer 21 may be more firm in combination with the manner in which the electret layer 21 is formed.
In addition, the supporting body 10 is used to provide a supporting force to ensure that the electret layer 20 can resist the impact of the fluid to be dedusted, and ensure sufficient mechanical strength. Thus, in order to further enhance the function of the electret layer 21 of electrostatically removing fine dust particles, the support body 10 itself may also be formed of the electret layer 21; in order to guarantee that it has sufficient mechanical strength simultaneously, the technical scheme that can adopt does:
the charge standing layer 20 includes: a mesh reinforcement matrix 13 and an electret layer 21; the electret layer 21 is formed on the mesh reinforcement base 13, which not only can ensure sufficient support strength, but also can expand the action range of the electret layer 21.
The specific using process of the invention is as follows:
firstly, the falling film structure described in the invention is arranged into a dust removal array in space according to a certain rule, and is fixed by a distribution plate (see figure 8 in a specific mode). Then the device is arranged in a flow channel needing dust removal, wherein a windward part (shown as 11 in figure 1) is opposite to the incoming flow direction of the dust-containing gas, and an electret (shown as 21 in figure 1) is attached to a crosswind part. And then charging the falling film structure by using a high-voltage charging device to charge the electrets to form an electric field. And then, a dust removal process can be carried out, wherein large particles are removed by inertial collision at the windward part, and small particles are removed by electric field force at the crosswind part. And stopping introducing the dust-containing gas after the charge is attenuated to the extent that small particles cannot be effectively removed, and electrifying again, so that the circulation is repeated. Due to the action of the isolation layer, the intermittent charging period is greatly prolonged, so that the particles can be removed more efficiently, and more energy consumption can be saved.
In order to verify the advantages of the device of the present invention over the conventional solutions in terms of removal rate, and especially for the differences in removal rate of the dust removing device designed based on the inertial collision theory, the following examples are provided.
It should be noted that all the following examples are described in detail with the best performance hydroxy acrylate resin as the experimental material, and the instruments and experimental steps used for the experiments of the other two insulating coatings (epoxy acrylate resin, polydimethylsiloxane) are the same as those of the above, and therefore are not described again, and only the final experimental analysis is performed.
Example 1
1) And an experimental instrument: the device mainly comprises an aerosol generating system, an aerosol detecting system and an aerosol removing system.
The aerosol removing system is mainly described, namely an electret dust removal array system is used, and comprises a support body attached with an electret, a distribution plate for fixing the support body and a positioning column which is connected with an upper distribution plate and a lower distribution plate and plays a role in positioning. Wherein the support body is an X-shaped support body, the slotting angle is 90 degrees, the slot depth is 2.47mm, the side thickness of the slot is 1mm, and the whole support body can be inserted into a square hole with the side length of 6.4 mm. The wind-resistant and energy-saving type wind power generator can be divided into a windward part, a side wind part and a leeward part, wherein the side wind part is attached with an electret and an insulating hydrophobic coating; the specific configuration of the distribution plate is as follows:
under the limits of 294mm length (this length refers to the length that can play a removing role in the incoming flow direction) and 72mm width of the experimental device, a dust removal unit arranged in a cascade mode is adopted. And the dust removal unit includes 15 unit rows in total, and two staggered equidistant physical rows form one unit row, as shown in fig. 11, the specific arrangement is as follows:
first unit row: the transverse distance between two holes in the same physical row is W 1 =5mm, spacing S between two physical rows 1 =5mm and the holes are square with a side length of 6.4mm (the hole shape parameters are the same as those described below).
The distance L between the first unit row and the second unit row 1 ＝5mm。
Second to fifth unit rows: lateral spacing W of two holes in the same physical row 2 =4mm, spacing S between two physical rows 2 =4mm. Spacing L between rows of cells 2 ＝4mm。
The distance between the fifth unit row and the sixth unit row is L 2 ＝4mm。
Sixth to fifteenth unit rows: spacing W between two holes in the same physical row 3 =3mm, spacing S between two physical rows 3 =3mm. The unit rows have a pitch L 3 ＝3mm。
2) And experimental materials: the electret material is polypropylene, the insulating hydrophobic coating is hydroxyl acrylate resin, and the mass ratio of the hydroxyl acrylate resin to the hydroxyl acrylate resin is as follows: hydroxyacrylate resin =1:5.5.
3) And setting experimental conditions:
electret charging voltage: 6kV;
charging time: 60s;
wind speed: 1.4m/s
4) Experimental procedure
(1) And coating the electret.
Firstly, weighing the mass of polypropylene powder and the mass of hydroxyl acrylate resin, and ensuring that the mass ratio of the polypropylene powder to the hydroxyl acrylate resin is 1:5.5, and then mixing the two uniformly. And then uniformly coating the obtained mixture on two side wind surface grooves of the X-shaped support body, and placing the support body in an oven for drying after the mixture is finished so as to completely solidify the support body.
(2) And installing a dust removal array.
The upper distribution plate and the lower distribution plate are positioned through small holes in four corners of the plate by using nuts and rigid positioning columns, so that the upper distribution plate and the lower distribution plate can be installed in clamping grooves in pipelines. And (2) inserting the support bodies coated with the electrets obtained in the step (1) into the holes corresponding to the upper distribution plate and the lower distribution plate, and placing the support bodies into corresponding positions in a pipeline after the support bodies are installed to prepare for a dust removal experiment.
(3) Dust removal experiment
Before the dust removal experiment begins, firstly, the electret dust removal array is charged, one end of a high-voltage power supply is grounded, the other end of the high-voltage power supply is connected with a metal positioning column of a distribution plate, the voltage is set to be 6kV, the charging time is set to be 60s, and then charging is carried out.
After charging, sealing the dust removal array, opening an air valve, adjusting the air speed to 1.4m/s, starting an aerosol generation system, and introducing solid powder, wherein the powder is Al 2 O 3 . After the stability, the aerosol detection system is used for respectively detecting the particle size and the concentration of the aerosol particles entering and exiting the dust removal unit.
5) And experimental results
Within the instrumental measurement range (0.024-1.36 μm), the average removal rate of aerosol particles with different particle sizes is 38.5%, and the most permeable particle size is about 0.1 μm.
Comparative example 1:
1) And an experimental instrument: the device mainly comprises an aerosol generation system, an aerosol detection system and an aerosol particle removal system. The experimental apparatus used was identical to the example except that the support in the aerosol particle removal system was electret-free coated.
2) And experimental materials: unlike the examples, the comparative examples have no specific material because the electret was not coated.
3) Setting of experimental conditions
Wind speed: 1.4m/s;
it is worth noting that: since the electret material is not coated, there is no charging step.
4) Experimental procedure
(1) Dust removal array installation
This procedure is essentially identical to the dust array installation of the example, the only difference being that the X-shaped metal posts used are not electret coated.
(2) Dust removal experiment
Firstly, sealing the dedusting array, then opening an air valve, firstly adjusting the air speed to 1.4m/s, then starting an aerosol generating system to introduce solid powder, wherein the powder is Al 2 O 3 . After the stability, the aerosol detection system is used for respectively detecting the particle size and the concentration of the aerosol particles entering and exiting the dust removal unit. (No charging step, since the electret was not coated, other steps were consistent with the previous examples)
5) And experimental results
In the measuring range of the instrument (0.024 mu m-1.36 mu m), the average removal rate of aerosol particles with different particle sizes is 23.2%, and the most permeable particle size is about 0.3 mu m.
Experimental analysis: comparing the experimental results of example 1 and comparative example 1, it was found that in the measurement range of the instrument, the removal rate of the dust-removing array coated with the electrets was about 66% higher than that of the dust-removing array which is not coated with electrets and has the same array arrangement mode as the former, which indicates that the electrostatic force brought by the electrets has a greater effect on the improvement of small particle removal. Because the traditional impinging stream dust removal array can only remove small particles by means of Brownian motion, the removal of the small particles can be effectively improved by introducing new external field force-electrostatic force.
Example 2
1) And an experimental instrument: like the first set of experiments, the core experimental instruments can be divided into aerosol detection systems, aerosol generation systems and, most importantly, aerosol removal systems. Wherein the construction of the aerosol removal system was identical to that in the first set of experiments.
2) And experimental materials: the electret material is polypropylene, the insulating hydrophobic coating is hydroxyl acrylate resin, and the mass ratio of the hydroxyl acrylate resin to the hydroxyl acrylate resin is as follows: hydroxyacrylate resin =2:3.
3) Setting of experimental conditions
Charging voltage: 6kV;
charging time: 60s;
wind speed: 1.3m/s.
4) And the experimental procedure
The experimental procedure is identical to that of the first set of experiments and will not be described herein, except that the gas velocity is set at 1.3m/s.
5) And experimental results
In the measuring range of an instrument (0.024 mu m-1.36 mu m), the average removal rate of aerosol particles with different particle sizes is 49.3 percent, and the most permeable particle size is about 0.087 mu m.
Comparative example 2
1) And an experimental instrument: the experimental apparatus used was identical to the example except that the support in the aerosol particle removal system was electret-free coated.
2) And experimental materials: no experimental material is stated separately as it was not coated with electret coating.
3) And setting experimental conditions:
wind speed: 1.3m/s.
4) And an experiment step:
(1) Dust removal array installation
This procedure is essentially identical to the installation of the dust removal array in the example, the only difference being that the X-shaped metal posts used are not electret coated.
(2) Dust removal experiment
Firstly, sealing the dedusting array, then opening an air valve, firstly adjusting the air speed to 1.3m/s, then starting an aerosol generating system to introduce solid powder, wherein the powder is Al 2 O 3 . After the stability, the aerosol detection system is used for respectively detecting the particle size and the concentration of the aerosol particles entering and exiting the dust removal unit. Since the electret was not coated, there was no charging step, and the other steps were identical to the previous examples.
5) And experimental results
Within the instrumental measurement range (0.024-1.36 μm), the average removal rate of aerosol particles with different particle sizes is 26.6%, and the most permeable particle size is still about 0.3 μm.
Experimental analysis: comparing the dusting results of example 2 with comparative example 2, it was found that the electret coated dusting array was about 85.3% higher in removal than the uncoated dusting array, within the range measurable by the instrument.
Example 3
1) And an experimental instrument: the same as the previous two experimental examples, and are not repeated.
2) And experimental materials: the electret material is polypropylene, the insulating hydrophobic coating is hydroxyl acrylate resin, and the mass ratio of the hydroxyl acrylate resin to the hydroxyl acrylate resin is as follows: hydroxy acrylate resin =3:1.
3) And setting experimental conditions:
charging voltage: 6kV;
charging time: 60s;
wind speed: 1.5m/s.
4) And an experiment step: in line with the examples in the first two sets of experiments, the description is not repeated here.
5) And experimental results
In the measuring range of an instrument (0.024 mu m-1.36 mu m), the average removal rate of aerosol particles with different particle sizes is 56.6 percent, and the most permeable particle size is about 0.079 mu m.
Comparative example 3
1) And an experimental instrument: the experimental apparatus used was identical to the example except that the support in the aerosol particle removal system was electret-free coated.
2) And experimental materials: no experimental material is stated separately as it was not coated with electret coating.
3) And setting experimental conditions:
wind speed: 1.5m/s.
4) And an experiment step: in accordance with the comparative examples in the first two groups of examples
5) And experimental results
In the measuring range of the instrument (0.024 mu m-1.36 mu m), the average removal rate of aerosol particles with different particle sizes is 20.8 percent, and the most easily permeable particle size is about 0.3 mu m.
Experimental analysis: comparing the dusting results of the examples with those of the comparative examples, it was found that the electret coated dusting arrays had approximately 172.1% higher removal than the uncoated dusting arrays, within the range measurable by the instrument.
Note: the other two insulation coatings, namely epoxy acrylate resin and polydimethylsiloxane, are tested under the same conditions except for different coatings, and are not described in detail. Specific results will be set forth collectively in the overall experimental analysis.
Analysis of the Total experiment
1. Analysis of the removal rates of examples 1-3 revealed that the removal rates increased with increasing electret content in the insulating hydrophobic coating and electret. This is because the density of the electrets is increased in a certain dust removing space, which is favorable for forming a stronger electric field, thereby improving the removal rate of small particles. The specific results are shown in tables 2-4:
table 2-hydroxy acrylate resins:
table 3-epoxy acrylate resins:
table 4-polydimethylsiloxane:
2. comparing examples 1-3 with comparative examples 1-3, it can be seen that the electret-coated dusting array provides a greater improvement in small particulate (0.024 μm to 1.36 μm) removal than the conventional impinging-stream dusting array without the electret coating under the same dusting array arrangement. It is shown that the introduction of the external field force-the electric field force has a larger strengthening effect on the removal of the small particles. The specific results are shown in tables 5-7:
table 5-hydroxy acrylate resins:
table 6-epoxy acrylate resins:
table 7-polydimethylsiloxane:
3. as can be seen by comparing examples 1 to 3 with comparative examples 1 to 3, the most permeable particle diameter was reduced from 0.3 μm of the conventional impinging stream dust removing apparatus due to the addition of the external field force, i.e., the electric field force. And by comparing the examples of different sets of experiments it was found that the extent of this decrease increases with increasing electret fraction, i.e. increasing electric field force. It is shown that the introduction of electric field forces can alter and reduce the most difficult particle sizes to remove as identified by conventional dedusting arrays. The specific results are shown in tables 8-10:
table 8-hydroxy acrylate resins:
table 9-epoxy acrylate resins:
table 10-polydimethylsiloxane:
4. by comparing the results of the aerosol particle removal experiments performed by applying different insulating coatings and electrets to a support under the same experimental conditions, it can be seen that the relative dielectric constant and the bulk conductivity are different (see table 1 for detailed parameters), so that the capacity of storing charges is different, the electric field strength is strong or weak, and the final aerosol removal rate is different, wherein the polyacrylate resin is the best insulating coating, the epoxy acrylate resin is the next best, and the polydimethylsiloxane is the worst, and the specific data are shown in tables 2-7.
While the present invention has been described by way of examples, and not by way of limitation, other variations of the disclosed embodiments can be devised by those skilled in the art in light of the foregoing description of the invention, and such variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A falling film structure for strengthening removal of dust particles is characterized in that:
comprises a support body (10) with mechanical strength and an electret layer (20) mainly used for removing small particles;
the support body (10) comprises a windward part (11) arranged facing the flowing direction of the fluid and a crosswind part (12) arranged at the side of the windward part (11);
the electret layer (20) is arranged on the side wind part (12) in a structural form capable of generating electric field acting force on small particles;
and (3) laying a water film coating on the windward part (11) and the static electricity storage layer (20) to remove the micro dust particles in the fluid.
2. The falling film structure for enhanced removal of fine dust according to claim 1, wherein:
the electret layer (20) comprises an electret layer (21) and an insulating layer (22); the insulating layer (22) and the electret layer (21) are provided in such a configuration that the insulating layer (22) can wrap the electret layer (21).
3. The falling film structure for enhanced removal of fine dust according to claim 2, wherein:
the electret layer (21) is mainly made of polypropylene.
4. The falling film structure for enhanced removal of fine dust according to claim 2, wherein:
the electret layer (21) is formed as an integral structure.
5. The falling film structure for enhanced removal of fine dust according to claim 2, wherein:
the isolation layer (22) is mainly made of one or more materials of hydroxyl acrylate resin, epoxy acrylate resin and polydimethylsiloxane.
6. The falling film structure for enhanced removal of fine dust according to claim 1, wherein:
the electret layer (20) includes an electret layer (21) and an insulating layer (22); the mass ratio range of the materials required to be prepared for the electret layer (21) and the isolation layer (22) is as follows: 1-3:1-6.
7. The falling film structure for enhanced removal of fine dust according to claim 1, wherein:
the side wind portion (12) is provided in an arc shape radially inward of the support body (10).
8. The falling film structure for enhanced removal of fine dust according to claim 1, wherein:
the side wind part (12) mainly comprises a side wall of the windward part (11) and a staying piece (121).
9. The falling film structure for enhanced removal of fine dust according to claim 1, wherein:
the wall surface of the side air part (12) is provided with a plurality of barb elements (122) at intervals along the length direction of the support body (10).
10. The falling film structure for enhanced removal of fine dust according to claim 1, wherein:
the support body (10) is provided with a mesh rib substrate (13), and the electricity-retaining layer (20) is formed by the mesh rib substrate (13) and forms a structural form of wrapping the mesh rib substrate (13).
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