CN108169101B - Anti-haze window screening filtering effect testing device and testing method - Google Patents
Anti-haze window screening filtering effect testing device and testing method Download PDFInfo
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- CN108169101B CN108169101B CN201810050526.9A CN201810050526A CN108169101B CN 108169101 B CN108169101 B CN 108169101B CN 201810050526 A CN201810050526 A CN 201810050526A CN 108169101 B CN108169101 B CN 108169101B
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- 238000012360 testing method Methods 0.000 title claims abstract description 108
- 238000001914 filtration Methods 0.000 title claims abstract description 45
- 230000000694 effects Effects 0.000 title claims abstract description 33
- 238000012216 screening Methods 0.000 title claims description 38
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 65
- 239000008275 solid aerosol Substances 0.000 claims abstract description 43
- 239000008263 liquid aerosol Substances 0.000 claims abstract description 34
- 238000009792 diffusion process Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 58
- 239000013618 particulate matter Substances 0.000 claims description 52
- 239000000443 aerosol Substances 0.000 claims description 44
- 238000010790 dilution Methods 0.000 claims description 28
- 239000012895 dilution Substances 0.000 claims description 28
- 239000011148 porous material Substances 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 16
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 235000011164 potassium chloride Nutrition 0.000 description 3
- 239000001103 potassium chloride Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- XRVCXZWINJOORX-UHFFFAOYSA-N 4-amino-6-(ethylamino)-1,3,5-triazin-2-ol Chemical compound CCNC1=NC(N)=NC(O)=N1 XRVCXZWINJOORX-UHFFFAOYSA-N 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- 239000005662 Paraffin oil Substances 0.000 description 2
- ZWYAVGUHWPLBGT-UHFFFAOYSA-N bis(6-methylheptyl) decanedioate Chemical compound CC(C)CCCCCOC(=O)CCCCCCCCC(=O)OCCCCCC(C)C ZWYAVGUHWPLBGT-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 150000003841 chloride salts Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
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- 239000012153 distilled water Substances 0.000 description 1
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- 239000003546 flue gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
Abstract
The invention discloses a device and a method for testing the filtering effect of an anti-haze window screen, wherein a larger port of a diffusion part is connected with an open port of a tubular body, and a smaller port is an air inlet; the middle part of the tubular body is provided with a clamping part, the clamping part is used for clamping and fixing a test sample, and the test sample divides the inner cavity of the tubular body into an upstream space close to the open mouth and a downstream space far away from the open mouth; one end of the tubular body far away from the diffusion part is provided with a negative pressure unit, and the negative pressure unit is communicated with the inner cavity of the tubular body through a first flowmeter; the tubular body is also provided with a pressure gauge for detecting the air pressure at two sides of the test sample, one end of the pressure gauge is connected with the upstream space, and the other end is connected with the downstream space. The device has the advantages that the device is simple in structure, and the testing process is simple and convenient through the control and data reading of the computer unit to the functional units. The testing device can realize three testing modes of solid aerosol, liquid aerosol and solid-liquid aerosol mixing, and the mixing proportion of the solid-liquid aerosol is controllable.
Description
Technical Field
The invention relates to a testing device for a filter material, in particular to a testing device for the filter effect of an anti-haze window screen.
The invention also relates to a testing method of the filter material, in particular to a testing method of the anti-haze window screening filter effect.
Background
Along with the continuous development of the industrialization degree of China, industrial flue gas, automobile exhaust and the like cause serious pollution to the atmospheric environment, and the environmental protection awareness of people is also stronger. Haze weather and PM2.5 become hot spot problems of people, and PM2.5 can enter alveoli through the respiratory tract to seriously harm human health. In haze weather, people dare not to open windows and breathe freely, and once the windows are opened, harmful substances such as fine particles easily enter a room, so that harm is caused to human health. With the pursuit of good air quality, anti-haze window screening materials are increasingly appearing in our lives. The anti-haze window screening material is used as a gas filtering material, particles in the air are trapped through air flow, and the air quality in the home can be purified.
At present, more and more anti-haze window screening materials are on the market, and the anti-haze window screening materials are all declared to have extremely high fine particle filtering capability, for example, the blocking efficiency of fine particles reaches 98% or even higher. However, at present, china does not have a testing device and a testing method for measuring the filtering performance of the anti-haze window screening material, so that the declared filtering efficiency cannot be supported by the technology. The capability of blocking particulate matters of the anti-haze window screening materials with good quality in the market cannot be detected and evaluated, and the filtering effects of different types of anti-haze window screening materials cannot be compared, so that consumers cannot select window screening materials which can truly prevent haze.
Along with more and more severe haze weather, the types and the quantity of anti-haze window screening materials on the market are also rapidly increased, and the filter performance detection and evaluation requirements of the anti-haze window screening materials are increased. The design of a corresponding filtering effect testing device and testing method for evaluating the filtering performance of the anti-haze window screening material is increasingly important. Corresponding testing device and testing method are urgently needed to detect and evaluate anti-haze window screening products in the market, performance comparison of different products and the like, and development of the products is facilitated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the anti-haze window screening filtering effect testing device and the testing method which have simple structures, are easy to install and replace test samples and can simultaneously or selectively conduct solid/liquid aerosol tests.
The invention relates to a device for testing the filtering effect of an anti-haze window screen, which is characterized by comprising the following components: the device comprises a tubular body with an inner cavity at one side, a horn-shaped diffusion part with two sides open, a solid aerosol generator, a liquid aerosol generator, a computer unit, an upstream particulate matter concentration detector and a downstream particulate matter concentration detector;
the larger port of the diffusion part is connected with the opening of the tubular body, and the smaller port is an air inlet; the middle part of the tubular body is provided with a clamping part, the clamping part is used for clamping and fixing a test sample, and the test sample divides the inner cavity of the tubular body into an upstream space close to the open mouth and a downstream space far away from the open mouth; the end of the tubular body far away from the diffusion part is provided with a negative pressure unit, and the negative pressure unit is communicated with the inner cavity of the tubular body through a first flowmeter; the tubular body is also provided with a pressure gauge for detecting the air pressure at two sides of the test sample, one end of the pressure gauge is connected with the upstream space, and the other end of the pressure gauge is connected with the downstream space;
the solid aerosol generator is connected with the heating unit, the first particle size cutter and the static neutralizer in series through a pipeline and then connected to the air inlet; the liquid aerosol generator is connected with the second particle size cutter in series through a pipeline and then connected to the air inlet; the computer unit is respectively and electrically connected with the solid aerosol generator, the liquid aerosol generator, the upstream particulate matter concentration detector and the downstream particulate matter concentration detector; the upstream particulate matter concentration detector is connected with the upstream space through a pipeline; the downstream particulate matter concentration detector is connected with the downstream space through a pipeline.
Preferably, a group of aerosol concentration control units are respectively arranged in the connecting pipeline of the solid aerosol generator and the air inlet, the connecting pipeline of the liquid aerosol generator and the air inlet and the upstream space of the tubular body; the aerosol concentration control unit is used for monitoring the aerosol concentration at the point.
Preferably, the aerosol concentration control unit comprises an air pump and a second flowmeter; the air pump is connected with the second flowmeter in series and then is connected with the monitoring point through an air pipe.
Preferably, a dispersing pore plate is arranged at the position of the upstream space close to the diffusion part; the dispersion pore plate is vertical to the tubular body, and the edge of the dispersion pore plate is sealed and connected with the inner wall surface of the inner cavity of the tubular body; the dispersing pore plate is uniformly provided with a plurality of through holes, and is used for enabling the distribution of aerosol in the inner cavity of the tubular body to be more uniform.
Preferably, the device for testing the filtering effect of the anti-haze window screening further comprises an upstream particulate matter concentration dilution unit, wherein the upstream particulate matter concentration dilution unit is arranged on a pipeline of the upstream particulate matter concentration detector connected with the upstream space, and the upstream particulate matter concentration dilution unit is electrically connected with the computer unit.
Preferably, the device for testing the filtering effect of the anti-haze window screen further comprises a downstream particulate matter concentration dilution unit, wherein the downstream particulate matter concentration dilution unit is arranged on a pipeline of a downstream particulate matter concentration detector connected with a downstream space, and the downstream particulate matter concentration dilution unit is electrically connected with the computer unit.
Preferably, a downstream filter is arranged at one end of the downstream space, which is close to the negative pressure unit; the downstream filter is perpendicular to the tubular body, and the edge of the downstream filter is in closed connection with the inner wall surface of the inner cavity of the tubular body.
Preferably, the air inlet is provided with an air inlet between the connecting pipeline of the solid aerosol generator and the connecting pipeline of the liquid aerosol generator, and an upstream filter is arranged at the air inlet.
The invention discloses a method for testing the filtering effect of an anti-haze window screen, which is characterized by comprising the following steps of:
s1, starting a solid aerosol generator and/or a liquid aerosol generator according to test requirements; generating solid and/or liquid aerosols using high pressure spraying; opening the negative pressure unit to enable the gas containing aerosol to move from the upstream space to the downstream space;
s2, if the solid aerosol generator is started, the heating unit and the static neutralizer are started; allowing the solid aerosol entering the tubular body to be sufficiently dry and electrically neutral;
s3, starting the first particle size cutter and/or the second particle size cutter, and controlling the particle size of aerosol particles entering the inner cavity of the tubular body;
s4, when the concentration of aerosol particles reaches a stable state, mounting a test sample on the clamping part for testing;
s5, the computer unit records the numerical values of the upstream particulate matter concentration detector, the downstream particulate matter concentration detector and the pressure gauge, and the corresponding filtering effect of the test sample is calculated.
Preferably, in the method for testing the filtering effect of the anti-haze window screening, in the step S4, before the test sample is mounted on the clamping part, the test sample is weighed to obtain a first weight value; in step S5, the pressure gauge detects the pressure difference between the upstream space and the downstream space, and when the pressure difference reaches a threshold value, the test sample is weighed to obtain a second weight value; the difference between the second weight value and the first weight value is the dust holding amount of the corresponding test sample.
The device and the method for testing the anti-haze window screening filtering effect have the advantages that the device is simple in structure, and the testing process is simple and convenient through control and data reading of the computer unit on the functional units. Three testing modes of solid aerosol, liquid aerosol and solid-liquid aerosol mixing can be realized, and the mixing proportion of the solid-liquid aerosol is controllable. The test sample is fast and convenient to install and replace, and the test sample can be replaced under the condition that other functional units are not closed or restarted, so that the product detection of multiple batches is continuously carried out. All filtering properties of the test sample are comprehensively detected, and the discharged waste gas is subjected to efficient filtering treatment in advance, so that the environment is not polluted. During testing, the concentration of aerosol particles is adjustable, different air quality can be simulated by adopting high or low aerosol particle concentration, and anti-haze window screening filtering effect detection can be performed. And secondly, the particle size of aerosol particles is adjustable, and the aerosol particles with dispersed particle sizes are separated through a first particle size cutter and/or a second particle size cutter, so that the required particle sizes and distribution of the aerosol particles are obtained. The distribution of aerosol particles is more uniform due to the arrangement of the dispersion pore plates, so that the test of the test sample is more accurate and reliable.
Drawings
FIG. 1 is a schematic structural view of the anti-haze window screening filtration effect testing device of the invention.
Reference numerals: 101-tubular body, 102-diffuser, 103-air inlet, 110-clamp, 111-test sample, 120-dispersion orifice plate, 131-downstream filter, 132-upstream filter, 140-manometer, 151-negative-pressure unit, 152-first flowmeter; 210-a solid aerosol generator, 220-a first particulate matter size cutter, 230-a heating unit, 240-an electrostatic neutralizer; 310-a liquid aerosol generator, 320-a second particulate matter size cutter; 400-computer unit; 511-upstream particulate matter concentration detector, 512-upstream particulate matter concentration dilution unit, 521-downstream particulate matter concentration detector, 522-downstream particulate matter concentration dilution unit; 600-aerosol concentration control unit, 610-aspiration pump, 620-second flowmeter.
Detailed Description
The embodiment provides an optimal implementation manner, as shown in fig. 1, an anti-haze window screening filtering effect testing device mainly includes: a tubular body 101 having an inner cavity formed on one surface thereof, a horn-shaped diffusion section 102 having an inner cavity formed on both surfaces thereof, a holding section 110, a dispersion orifice plate 120, a downstream filter 131, an upstream filter 132, a solid aerosol generator 210, a first particle diameter cutter 220, a heating unit 230, an electrostatic neutralizer 240, a liquid aerosol generator 310, a second particle diameter cutter 320, a computer unit 400, an upstream particle concentration detector 511, an upstream particle concentration dilution unit 512, a downstream particle concentration detector 521, a downstream particle concentration dilution unit 522, and three sets of aerosol concentration control units 600.
The larger port of the diffuser 102 is connected with the open mouth of the tubular body 101, and the smaller port is the air inlet 103. The middle part of the tubular body 101 is provided with a clamping part 110, the clamping part 110 is used for clamping and fixing a test sample 111, and the test sample 111 divides the inner cavity of the tubular body 101 into an upstream space close to the open mouth and a downstream space far away from the open mouth. The clamping part 110 comprises a clamping frame main body and a fixing frame, a rubber sealing strip is adhered to the clamping and fixing part 111 of the test sample, and a supporting rod is arranged, so that the test sample can be effectively clamped and fixed, the sample clamping frame is prevented from slipping and deforming greatly under the action of wind force, and the sample clamping frame is convenient to install and detach.
The end of the tubular body 101 far away from the diffusion part 102 is provided with a negative pressure unit 151, and the negative pressure unit 151 is communicated with the inner cavity of the tubular body 101 through a first flowmeter 152. The test device forms a negative pressure system through the arrangement of the negative pressure unit 151, so that air flow can stably pass through the test sample 111, and the filtering effect of the anti-haze window screening material in different wind forces can be measured by adjusting the air flow. A downstream filter 131 is arranged at one end of the downstream space, which is close to the negative pressure unit 151; the downstream filter 131 is perpendicular to the tubular body 101, and the edge of the downstream filter 131 is sealed and connected with the inner wall surface of the inner cavity of the tubular body 101. Because the gas passing through the test sample 111 still contains a small amount of aerosol, depending on the filtering effect of the test sample 111. In order not to pollute the environment, a high-efficiency downstream filter 131 is installed at the front ends of the negative pressure unit 151 and the first flowmeter 152. The experimental gas discharged into the air is clean, the air quality is not affected, and the physical health of experimental staff is not endangered.
The tubular body 101 is further provided with a pressure gauge 140 for detecting air pressure at two sides of the test sample 111, one end of the pressure gauge 140 is connected with the upstream space, and the other end is connected with the downstream space, so that the filtering resistance corresponding to the test sample 111 can be calculated. The upstream space is provided with a dispersing orifice 120 at a position close to the diffuser 102. The dispersion pore plate 120 is perpendicular to the tubular body 101, and the edge of the dispersion pore plate 120 is sealed and connected with the inner wall surface of the inner cavity of the tubular body 101. The dispersing orifice 120 is provided with a plurality of through holes uniformly distributed, so that the aerosol is distributed more uniformly in the inner cavity of the tubular body 101.
The solid aerosol generator 210 is connected to the air inlet 103 through a pipeline in series with the heating unit 230, the first particulate matter cutter 220 and the static neutralizer 240. The liquid aerosol generator 310 is connected to the air inlet 103 after being connected in series with the second particle size cutter 320 through a pipeline. The air inlet 103 is provided with an air inlet between the connecting pipeline of the solid aerosol generator 210 and the connecting pipeline of the liquid aerosol generator 310, and an upstream filter 132 is arranged at the air inlet; for filtering air entering the cavity. The upstream filter 132 provides more purity to the air entering the lumen, and further increases the confidence of the test data. The solid aerosol generator 210 is used for generating solid aerosol, and distilled water and chloride salt, such as sodium chloride or potassium chloride, can be used for preparing a chloride salt solution with a certain concentration, and the solid aerosol is generated by high-pressure spraying. The liquid aerosol generator 310 is used for generating liquid aerosol, and can be directly generated by high-pressure spraying of dioctyl phthalate DOP, paraffin oil, diisooctyl sebacate DEHS and other reagents. When the solid aerosol is used as the filtering test medium, the heating unit 230 is used to dry the moisture contained in the solid particles in the solid aerosol, so as to obtain dry solid aerosol particles, namely NaCl crystals or KCl crystals. The electrons on the solid aerosol particles are then neutralized by the electrostatic neutralizer 240, rendering the solid aerosol particles electrically neutral. The first particle size cutter 220 and the second particle size cutter 320 are capable of performing particle size cutting on the particles dispersed in the particle size range generated by the solid aerosol generator 210 and the liquid aerosol generator 310 to obtain the desired particle size and distribution for subsequent experiments.
The computer unit 400 is electrically connected to each functional unit such as the solid aerosol generator 210, the liquid aerosol generator 310, the upstream particulate matter concentration detector 511, and the downstream particulate matter concentration detector 521, and is used for reading data of each functional unit and controlling opening and closing of each functional unit. The upstream particulate matter concentration detector 511 is connected to the upstream space through a pipeline, and the upstream particulate matter concentration dilution unit 512 is disposed on the pipeline of the upstream particulate matter concentration detector 511 connected to the upstream space, where the upstream particulate matter concentration dilution unit 512 is electrically connected to the computer unit 400. The downstream pm concentration detector 521 is connected to the downstream space through a pipeline, and the downstream pm concentration dilution unit 522 is disposed on the pipeline of the downstream space connected to the downstream pm concentration detector 521, where the downstream pm concentration dilution unit 522 is electrically connected to the computer unit 400. The upstream pm concentration detector 511 and the downstream pm concentration detector 521 are identical in model, and may be selected to detect the pm amount concentration or the pm amount concentration, and subjected to consistency correction. The upstream and downstream pm concentration dilution units 512 and 522 function to simulate extremely polluted air, and may cause the aerosol pm concentration to exceed the normal upper operating limits of the upstream and downstream pm concentration detectors 511 and 521. It is necessary to perform concentration dilution by the two particulate matter concentration dilution units respectively previously described and send the dilution ratio to the computer unit 400. For example, when the dilution ratio is 100 times, the computer unit 400 amplifies the values obtained from the upstream particulate matter concentration detector 511 and the downstream particulate matter concentration detector 521 by 100 times and then performs the subsequent calculation processing.
The connection pipeline between the solid aerosol generator 210 and the air inlet 103, the connection pipeline between the liquid aerosol generator 310 and the air inlet 103 and the upstream space of the tubular body 101 are respectively provided with a group of aerosol concentration control units 600; the aerosol concentration control unit 600 is used to monitor the aerosol concentration at the point. The aerosol concentration control unit 600 includes a suction pump 610 and a second flowmeter 620; the pump 610 is connected in series with the second flowmeter 620 and then connected to the monitoring point through the air pipe. After the three aerosol concentration control units 600 are provided, aerosol particle concentrations required for experiments can be controlled. The liquid aerosol particle concentration or the solid aerosol particle concentration is controlled by the pump 610 and the second flowmeter 620, respectively, at the position where the aerosol passes through, and the concentrations of both are further controlled in the upstream space. Through concentration control, the condition of different air pollution degrees can be simulated to carry out the filtration performance detection evaluation of anti-haze window screening materials.
Meanwhile, in order to facilitate the movement of the whole anti-haze window screening filtering effect testing device, a plurality of groups of universal wheels can be arranged below the tubular body 101 for auxiliary movement. The external balance weighing tool can be used for weighing the test sample 111 before and after the test, so as to obtain the dust holding capacity corresponding to the test sample 111.
The anti-haze window screening filtering effect testing device can be utilized to realize a corresponding testing method, and the testing method comprises the following steps:
s1, firstly, pouring 2% NaCl or KCl solution into the solid aerosol generator 210 according to the test requirement, or pouring reagents with preset proportions such as dioctyl phthalate DOP, paraffin oil, diisooctyl sebacate DEHS and the like into the liquid aerosol generator 310. Various operating parameters of the computer unit 400, such as sampling time, are set. The computer unit 400 controls the opening of the solid aerosol generator 210 and/or the liquid aerosol generator 310, generating solid and/or liquid aerosols using high pressure spraying; the computer unit 400 controls the negative pressure unit 151 to be turned on, compares the preset flow rate with the value of the first flow meter 152, and controls the power of the negative pressure unit 151 in real time so that the aerosol-containing gas moves from the upstream space to the downstream space at the preset flow rate. The aerosol, singly or mixed in proportion, is dispersed through the dispersing orifice 120 of the inner cavity, so that the aerosol is uniformly dispersed in the inner cavity.
S2, if the solid aerosol generator 210 is started, the computer unit 400 controls the heating unit 230 and the electrostatic neutralizer 240 to be started; the solid aerosol entering the tubular body 101 is sufficiently dry and electrically neutral. If the solid aerosol generator 210 is not activated, it proceeds directly to the next step.
S3, the computer unit 400 controls the first particle size cutter 220 and/or the second particle size cutter 320 to be turned on, and controls the particle size of aerosol particles entering the inner cavity of the tubular body 101.
S4, cutting the test sample 111 into a specified size, and weighing the test sample 111 to obtain a first weight value; and then mounted on a sample holder. It is determined whether the concentration of aerosol particles reaches a steady state or not, based on the values of the second flow meters 620 in the respective sets of aerosol concentration control units 600. When the aerosol particle concentration has stabilized, the sample holder is mounted to the test device along with the test sample 111 for testing.
S5, the computer unit 400 records the values of the upstream particulate matter concentration detector 511, the downstream particulate matter concentration detector 521 and the pressure gauge 140, and calculates the filtration efficiency and the filtration resistance corresponding to the test sample 111 according to the dilution multiples of the upstream particulate matter concentration dilution unit 512 and the downstream particulate matter concentration dilution unit 522. The pressure gauge 140 detects the pressure difference between the upstream space and the downstream space, and when the pressure difference reaches a threshold value, the test sample 111 is weighed to obtain a second weight value; the difference between the second weight value and the first weight value is the dust holding amount of the corresponding test sample 111. The threshold may be a "differential pressure failure" in the field of testing technology.
The pressure gauge 140 may be a digital micro-pressure gauge; the test sample 111 may be weighed using an electronic balance.
The anti-haze window screening filtering effect testing device and the testing method have the beneficial effects that: the negative pressure unit 151 is adopted for exhausting air, so that the inner cavity of the whole set of testing device presents negative pressure, and the purposes of conveying air and controlling gas flow are achieved. The anti-haze window screening was tested for filtration efficiency and filtration resistance for a prescribed particle size and particle concentration with the upstream particle concentration detector 511, downstream particle concentration detector 521, and pressure gauge 140; the dust holding capacity is determined by weighing with an electronic balance. The powerful aerosol concentration control unit 600 can effectively control the concentration of aerosol particles required for sample detection, and can simulate the filtering effect of the anti-haze window screening in different environmental pollution. The dispersing pore plate 120 ensures that aerosol particles are uniformly distributed in the inner cavity before experiments, and the effectiveness and repeatability of measurement results are ensured. The sample clamping frame can firmly clamp the test sample and provide a supporting function, so that the sample is prevented from slipping or being greatly deformed in the experimental process. The testing method can effectively test different anti-haze window screening products, and the measurement results of different products are comparable.
It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the invention as defined in the appended claims.
Claims (7)
1. Anti-haze window screening filter effect testing arrangement, its characterized in that includes: a tubular body (101) with an inner cavity at one side, a horn-shaped diffusion part (102) with an inner cavity at two sides, a solid aerosol generator (210), a liquid aerosol generator (310), a computer unit (400), an upstream particulate matter concentration detector (511) and a downstream particulate matter concentration detector (521);
the larger port of the diffusion part (102) is connected with the open port of the tubular body (101), and the smaller port is an air inlet (103); the middle part of the tubular body (101) is provided with a clamping part (110), the clamping part (110) is used for clamping and fixing a test sample (111), and the test sample (111) divides the inner cavity of the tubular body (101) into an upstream space close to the open mouth and a downstream space far from the open mouth; one end of the tubular body (101) far away from the diffusion part (102) is provided with a negative pressure unit (151), and the negative pressure unit (151) is communicated with the inner cavity of the tubular body (101) through a first flowmeter (152); the tubular body (101) is also provided with a pressure gauge (140) for detecting the air pressure at two sides of the test sample (111), one end of the pressure gauge (140) is connected with the upstream space, and the other end is connected with the downstream space;
the solid aerosol generator (210) is connected with the heating unit (230), the first particle size cutter (220) and the static neutralizer (240) in series through a pipeline and then connected to the air inlet (103); the liquid aerosol generator (310) is connected with the air inlet (103) through a pipeline after being connected with the second particle size cutter (320) in series; the computer unit (400) is respectively and electrically connected with the solid aerosol generator (210), the liquid aerosol generator (310), the upstream particulate matter concentration detector (511) and the downstream particulate matter concentration detector (521); the upstream particulate matter concentration detector (511) is connected with the upstream space through a pipeline; the downstream particulate matter concentration detector (521) is connected with the downstream space through a pipeline;
the connecting pipeline of the solid aerosol generator (210) and the air inlet (103), the connecting pipeline of the liquid aerosol generator (310) and the air inlet (103) and the upstream space of the tubular body (101) are respectively provided with a group of aerosol concentration control units (600); the aerosol concentration control unit (600) is used for monitoring the aerosol concentration of the point;
the aerosol concentration control unit (600) comprises an air pump (610) and a second flowmeter (620); the air pump (610) is connected with the second flowmeter (620) in series and then is connected with the monitoring point through an air pipe;
a dispersion pore plate (120) is arranged at the position of the upstream space close to the diffusion part (102); the dispersion pore plate (120) is perpendicular to the tubular body (101), and the edge of the dispersion pore plate (120) is sealed and connected with the inner wall surface of the inner cavity of the tubular body (101); the dispersing pore plate (120) is uniformly provided with a plurality of through holes, and is used for enabling the distribution of aerosol in the inner cavity of the tubular body (101) to be more uniform.
2. The device for testing the filtering effect of the anti-haze window screening according to claim 1, further comprising an upstream particulate matter concentration dilution unit (512), wherein the upstream particulate matter concentration dilution unit (512) is arranged on a pipeline of the upstream space connected with the upstream particulate matter concentration detector (511), and the upstream particulate matter concentration dilution unit (512) is electrically connected with the computer unit (400).
3. The device for testing the filtering effect of the anti-haze window screening according to claim 1, further comprising a downstream particulate matter concentration dilution unit (522), wherein the downstream particulate matter concentration dilution unit (522) is disposed on a pipeline of the downstream space connected to the downstream particulate matter concentration detector (521), and the downstream particulate matter concentration dilution unit (522) is electrically connected to the computer unit (400).
4. The device for testing the filtering effect of the anti-haze window screening according to claim 1, wherein a downstream filter (131) is arranged at one end of the downstream space, which is close to the negative pressure unit (151); the downstream filter (131) is perpendicular to the tubular body (101), and the edge of the downstream filter (131) is in closed connection with the inner wall surface of the inner cavity of the tubular body (101).
5. The device for testing the filtering effect of the anti-haze window screening according to claim 1, wherein the air inlet (103) is provided with an air inlet between a connecting pipeline of the solid aerosol generator (210) and a connecting pipeline of the liquid aerosol generator (310), and an upstream filter (132) is arranged at the air inlet.
6. An anti-haze window screening filtration effect testing method, characterized in that the anti-haze window screening filtration effect testing device according to any one of claims 1 to 5 is used for carrying out the following steps:
s1, starting a solid aerosol generator (210) and/or a liquid aerosol generator (310) according to test requirements; generating solid and/or liquid aerosols using high pressure spraying; opening a negative pressure unit (151) to move the aerosol-containing gas from the upstream space to the downstream space;
s2, if the solid aerosol generator (210) is started, the heating unit (230) and the static neutralizer (240) are started; allowing the solid aerosol entering the tubular body (101) to be sufficiently dry and electrically neutral;
s3, starting the first particle size cutter (220) and/or the second particle size cutter (320) to control the particle size of aerosol particles entering the inner cavity of the tubular body (101);
s4, when the concentration of aerosol particles reaches a stable state, mounting a test sample (111) on the clamping part (110) for testing;
s5, the computer unit (400) records the numerical values of the upstream particulate matter concentration detector (511), the downstream particulate matter concentration detector (521) and the pressure gauge (140), and the corresponding filtering effect of the test sample (111) is calculated.
7. The method for testing the filtering effect of the anti-haze window screening according to claim 6, wherein the step S4 is to weigh the test sample (111) to obtain a first weight value before the test sample (111) is mounted on the clamping portion (110); in step S5, the pressure gauge (140) detects a pressure difference between the upstream space and the downstream space, and when the pressure difference reaches a threshold value, the test sample (111) is weighed to obtain a second weight value; the difference between the second weight value and the first weight value is the dust holding amount of the corresponding test sample (111).
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