KR102085894B1 - Evaluation Apparatus for reduction performance of road dust resuspension and evaluation method using the same - Google Patents

Abstract

A task to be solved by the present invention is to provide an apparatus for evaluating road ash scattering dust reduction performance capable of evaluating the road ash scattering dust absorption performance. The present invention relates to the apparatus for evaluating the road ash scattering dust reduction performance, which comprises: a sample mounting unit which fixes a road pavement material sample; a water spraying unit mounted on the sample mounting unit and injecting water onto the sample; a hopper coupled to a lower part of the sample mounting unit, and providing a path collecting the water to a central part and discharging the water; and a dust collecting unit mounted at the lower part of the hopper.

Description

{Evaluation Apparatus for reduction performance of road dust resuspension and evaluation method using the same}

The present invention relates to a performance evaluation apparatus and a performance evaluation method for reducing dust re-scattering of roads, and more particularly, to measure the dust transmission performance of road pavement materials to evaluate the reduction effect of re-scatterable dust. It relates to an evaluation device and a performance evaluation method.

Recently, as the concentration of fine dust on the Korean Peninsula has increased, it has become a health threat not only for the elderly but also for the general adult. The causes of fine dust are various, such as dust coming from China and particles emitted from power plants. Dust is also generated on roads through which automobiles pass, especially in the amount generated by road friction of automobile tires. The dust generated in this way may remain on the road surface and be removed by sweeping with rainwater, but this causes re-scattering along the wind generated by the driving of the vehicle, thereby increasing the concentration of dust on and around the road. In particular, according to the EPA-42 Appendix, the size of dust that can be re-scattered on the road is specified to be 75 microns or less, and it is reported that such fine particle dust is harmful to the human body.

As a method for collecting and analyzing re-spattering dust on the road, there is a method of directly measuring the amount of scattering dust by attaching a sensor to the front and rear of the vehicle's wheels, but separately analyzing and analyzing fine dust based on PM10 and PM2.5. There is a difficult problem to do. There are cases in which particles are electrically attached to a broom and a sieve, or a vacuum suction device is used, but the analysis results depend on the skill of the measurer, thus failing to guarantee the reliability of the analysis.

Korean Patent Publication No. 2016-0103766 discloses a prior document regarding a device for collecting fine dust. The prior document is provided with an inlet through which a certain flow rate of air containing fine dust is introduced on the upstream side and an outlet through which the air from which the fine dust is removed is discharged on the downstream side to form a flow path through which air flows; A collection space in which fine dust contained in flowing air provided in the flow path is collected; A beta line irradiation unit provided at a predetermined distance from the collection area in the flow path and irradiating a beta line toward the collection area; And a beta line detection unit provided below the collecting area in the flow path and detecting a beta line passing through the collecting area. However, the automatic fine dust measuring device disclosed in the above-mentioned prior art does not include a configuration for measuring re-dust dust on the road in consideration of the dust permeation performance of the road pavement. Therefore, there is a great need to develop a performance evaluation apparatus and a performance evaluation method for reducing road re-scattering dust that can objectively measure and evaluate the performance of reduction of re-scatterable dust according to the type of pavement.

Therefore, the first problem to be solved by the present invention is to provide a road re-scattering dust reduction performance evaluation device capable of measuring the re-scattering dust absorption performance of a road in consideration of properties such as pore size and porosity of road pavement.

The second problem to be solved by the present invention is to provide a method for evaluating the performance of reducing dust on a road by using the apparatus for evaluating the performance of reducing dust on a road.

In order to achieve the first problem, the present invention, as a device for evaluating the performance of reducing dust re-flighting the road, a sample mounting unit for fixing a road pavement sample, and a water injection unit mounted on the sample mounting unit to inject water onto the sample And a hopper coupled to the lower portion of the sample mounting portion to provide a path for collecting and discharging water to the central portion, and an apparatus for evaluating the performance of reducing road scattering dust including a dust collecting portion mounted on the lower portion of the hopper.

According to an embodiment of the present invention, the dust collecting part may include a plurality of filter parts having different pores, and a dust collecting container in which water and dust passing through the filter part are stored.

According to another embodiment of the present invention, a vibration inducing unit for generating vibration in the sample mounting unit may be further included.

According to another embodiment of the present invention, the sample mounting portion may include a sealing portion for sealing the lower edge of the sample.

In order to achieve the second problem, the present invention is a dust reduction performance evaluation method using an apparatus for evaluating the performance of reducing dust re-flighting on a road, the step of mounting a sample in a sample mounting portion, and a contaminant on the top of the sample. Injecting, injecting water into the upper portion of the sample into which the contaminants are added, imparting vibration to the sample in which the water is injected, drying the sample in hot air, and top of the sample in which the hot air is dried A step of injecting dust into the sample, injecting water into the sample into which the dust has been injected, imparting vibration to the sample into which the water has been injected, and dust passing through the sample into the dust collecting container using a filter unit. Collecting, drying the dust collecting container in which the dust is collected, and measuring the dust mass in the dried dust collecting container. To provide a re-scattered dust reduction performance evaluation method.

The method for evaluating and reducing the performance of dust scattering of roads of the present invention has the following effects.

1. By uniformly applying dust on the road pavement and infiltrating the inside pores of the road pavement by using a water jet, it is possible to evaluate the performance of dust passing through the road pavement and removed by rainwater.

2. It is possible to accurately measure the amount of dust that has passed through the pavement by measuring the mass of the collected dust, and selectively measure only the amount of dust permeation of the desired size by using filter parts of different pore sizes formed in the dust collecting part. have.

3. The sealing portion formed in the sample mounting portion can reduce measurement errors caused by water and dust flowing into the space between the sample frame and the sample without passing through the inside of the sample.

4. Vibration inducing part can help the dust easily penetrate into the pavement of the road and measure the amount of dust penetration quickly and accurately.

5. The optical part installed around the dust collecting part can relatively compare the amount of fine dust dispersed in water through a change in light absorption.

1 and 2 show an apparatus for evaluating the performance of reducing dust scattered off roads according to the present invention.
3 is an exploded view of the road re-scattering dust reduction performance evaluation device of the present invention.
Figure 4 shows the dust collecting portion of the road re-scattering dust reduction performance evaluation apparatus of the present invention.
Figure 5 shows a sample mounting portion of the road re-scattering dust reduction performance evaluation device of the present invention.
6 sequentially shows a method of evaluating the performance of reducing dust on a road by using the performance evaluation apparatus for reducing road scattering of the present invention.

The present invention relates to an apparatus for evaluating the performance of reducing dust re-flighting a road, a sample mounting unit for fixing a sample of a road pavement, a water injection unit mounted on the sample mounting unit to inject water onto the sample, and water coupled to the lower portion of the sample mounting unit It includes a hopper that provides a path to collect and discharge to the central portion, and a dust collecting portion mounted on the lower portion of the hopper.

The road re-scattering dust reduction performance evaluation apparatus of the present invention was developed for the purpose of measuring the removal efficiency of dust that can be re-scattered on roads with respect to different road pavements. To do this, first, it is necessary to simulate the ground absorption process of dust caused by rainwater on the actual road, and secondly, it must be able to selectively collect only dust having a size that is scatterable from the dust absorbed on the ground, and thirdly It should be possible to measure the amount of dust.

In the present invention, a configuration for inducing rain and road pavement penetration with respect to the first need includes a sample mounting part, a water jetting part, a vibration inducing part, and a filter part having different pore sizes for the second need. It includes a configuration related to a dust collection unit that is sequentially coupled, and a configuration related to a fine dust collection container for collecting water and dust collected for the third need and an optical unit formed around the collection container.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 and 2 are a perspective view and a front view, respectively, of the apparatus for evaluating the performance of reducing dust scattered off roads of the present invention. 1 and 2, the road re-scattering dust reduction performance evaluation apparatus 100 of the present invention includes a water injection unit 110, a sample mounting unit 120, a hopper 130, a dust collection unit 140 and vibration It includes an induction unit 160.

The sample mounting unit 120 is configured to load samples of different types of road pavement, and includes a sample fixing frame having an open top and a locking jaw and a drain hole at the bottom, and a lid 121d covering the sample fixing frame. Includes. The lid 121d functions to prevent the scattered dust from flowing out when the water is sprayed.

The water injection unit 110 is installed on the sample mounting unit 120, and sprays water evenly through the open space of the lid 121d. The water injection portion may include a funnel-shaped water injection portion for injecting water into the upper portion, and a portion in which water is injected is formed with a plurality of holes, such as a shower head.

The hopper 130 is a configuration for collecting water that has passed through the lower portion of the sample mounting portion 120 to the center and connecting it to the dust collecting portion 140, and is coupled while maintaining airtightness with the sample mounting portion 120, and cross-sectional area toward the lower portion It has a narrowing structure. The hopper 130 is fixed on the lower support 150 by the supporter 131.

The dust collecting unit 140 is coupled while maintaining airtightness at the bottom of the hopper 130, and functions to collect water and dust passing through the sample step by step.

The vibration inducing unit 160 applies a vibration to the sample to help dust easily pass through the pores of the road pavement sample. The vibration inducing unit 160 preferably generates vibrations at the same time as the sample mounting unit 120 and the dust collecting unit 140, thereby vibrating the entire lower support 150 and the support frame 161 for coupling the vibration induction unit and the sample mounting unit. It is configured to be able to. The vibration unit 162 is preferably installed on the lower portion of the lower support 150, it may be implemented in a mechanical configuration, such as a crank structure connecting the rotating shaft of the motor to the eccentric rotating shaft, or an electrical component using a piezoelectric element You can. An elastic member 163 is coupled between the lower support 150 and the ground support 170 so that the sample mounting part and the dust collecting part can vibrate freely by the vibration inducing part. Specifically, the lower support 150 and the ground support 170 are connected to the rod so as to have a gap in the vertical direction and move, and the spring is wrapped around the periphery of the rod to have elasticity between the lower support 150 and the ground support 170 So that the distance can be changed.

3 is an exploded view of the road re-scattering dust reduction performance evaluation device of the present invention. Referring to FIG. 3, a lid 121d is fastened to an upper portion of the sample mounting unit 120, and a water jet unit 110 is coupled to an open space of the lid 121d. The hopper 130 is coupled to the lower portion of the sample mounting unit 120 while maintaining airtightness, and the dust collecting unit 140 is coupled to the lower portion of the hopper 130 while maintaining airtightness. The hopper 130 and the dust collecting portion 140 may be combined to be detachable, and specifically, rotationally fastened along a screw thread, and an O-ring is coupled to the coupling portion to maintain airtightness. The combined sample mounting portion 120, the hopper 130, and the dust collecting portion 140 are fixed once again by the support frame 161, and the hopper 130 is supported by the lower supporter 150 by the spotter 131. The support frame 161 is also fixed to the lower support 150. A vibration induction unit 160 is coupled to a lower portion of the lower support 150. The lower support 150 is coupled to the ground support 170 by an elastic member 163.

The road re-scattering dust reduction performance evaluation apparatus of the present invention includes a dust collecting unit. The dust collecting part includes a filter part through which water passes and filters dust of a predetermined size or more, and the filter part may be sequentially coupled downward in a direction in which pores of the filter become smaller. A fine dust collecting container is coupled to a lower portion of the filter part, so that water and fine dust passing through the filter part can be collected. Hereinafter, a specific configuration of the dust collecting unit will be described again using the drawings.

Figure 4 shows the dust collecting portion of the road re-scattering dust reduction performance evaluation apparatus of the present invention. Referring to FIG. 4, the dust collecting part 140 includes an upper cap 141, a first filter part 142, a second filter part 143, a third filter part 144, and a fine dust collecting container 145. It includes. The upper stopper 141 is formed with a hole in the central portion and is connected to the lower portion of the hopper, and the upper stopper hole has elasticity, and thus may have airtightness in connection with the lower portion of the hopper. The first filter portion 142, the second filter portion 143, and the third filter portion 144 sequentially connected to the lower portion of the upper stopper 141 may be configured by a rotational fastening method using a screw thread, thereby ensuring confidentiality. O-rings can be inserted between the contact surfaces. The first filter unit 142, the second filter unit 143, and the third filter unit 144 may be formed of a structure in which a network is coupled to a lower portion of the cylindrical support unit, the first filter unit 142, the second filter The meshes of the parts 143 and the third filter part 144 may be formed of meshes having pores of different sizes, and the pores of the mesh become smaller toward the third filter part from the first filter part to reduce dust. It can be collected by classification. Sequentially arranging the pore sizes of the filter part is a function that minimizes measurement errors that dust of a size that can pass through the mesh does not pass through the mesh because relatively large dust blocks the pores of the mesh in addition to the purpose of enabling classification of dust. Do it. A fine dust collecting container 145 is coupled to a lower portion of the third filter unit 144. The fine dust collecting container may be made of a metal material or transparent glass. In order to measure only the mass of the fine dust from which water is removed by drying the water collected in the fine dust collecting container in an oven, there is no loss or deformation of material due to heat. It is selected as a material.

Figure 5 shows a sample mounting portion of the road re-scattering dust reduction performance evaluation device of the present invention. 5, the sample mounting portion includes a lid (not shown), a sample fixing frame 121, and a sealing portion 122. The sample fixing frame 121 includes a vertical plate 121a forming four sides and a lower plate 121b coupled to the lower portion. The lower plate 121b supports and secures the lower portion of the sample 200, and the center is opened to form a drain hole 121c. The sealing part 122 is inserted into the sample fixing frame 121, and the sealing part 122 is formed in a square ring shape with an open center and is placed on the upper portion of the lower plate 121b. The sealing portion 122 is made of a rubber or polymer resin having elasticity, prevents water from passing through the lower rim area of the sample 200, and contacts the inner wall surface of the vertical plate 121a. Prevents water from passing through. The sealing portion functions to prevent water from entering the hopper without passing through the inside of the sample.

Although not illustrated in the drawings, the apparatus for evaluating the performance of reducing dust scattered on the road according to the present invention may include an additional configuration for relatively measuring the amount of collected fine dust. The configuration for measuring the amount of fine dust can be implemented by an optical method.

Specifically, the fine dust and water passing through the filter part are collected in the fine dust collecting container, and the fine dust dispersed in the water can reduce or transmit light, thereby reducing light transmittance compared to pure water. At this time, the material of the fine dust collecting container may be selected as a transparent material, and light may be transmitted through the dispersion liquid introduced into the collecting container to observe a change in transmittance. As a configuration for this, a light source is installed on one side of the fine dust collecting container, and an optical sensor is installed on the other side to measure the intensity of light passing through the collecting container. By comparing the intensity of light measured in a state where the fine dust collecting container is filled with pure water and the intensity of light measured in a state where the fine dust dispersion is filled, it is possible to analyze the performance of fine dust transmission for different samples. In the process of measuring the intensity of light, vibration can be applied to the fine dust collecting container. When vibration is applied to the fine dust collecting container, it is possible to prevent the fine dust from sinking to the bottom, thereby improving the accuracy of the transmission measurement. At this time, the light source and the light sensor may be separately installed in a region free from vibration, and although not shown in the drawings, the light source and the light sensor may be installed by connecting separate supports on the ground support.

The road re-scattering dust reduction performance evaluation device of the present invention is a device used to evaluate the fine dust permeation performance of a road pavement, and evaluates the performance of a road pavement using the road re-scattering dust reduction performance evaluation device of the present invention below The method will be described.

6 sequentially shows a method of evaluating the performance of reducing dust on a road by using the performance evaluation apparatus for reducing road scattering of the present invention. Referring to FIG. 6, the method for evaluating the performance of reducing dust re-flighting of a road is a first step in which pores are partially blocked by injecting a contaminant into a sample, and measuring a fine dust absorption capacity of a clogged road pavement. It is divided into a second course.

The first process, the clogging induction process, is as follows. First, open the lid of the sample mounting part and mount the sample of the road pavement on the sample fixing frame. The sample may be pre-cut and processed to fit the shape and size of the sample holder. Subsequently, a predetermined amount of dust is injected onto the sample fixed to the sample mounting portion. The injected dust is uniformly dispersed on the sample surface using a broom or the like. The dust uses standardized materials such as 'Arizona Dust', which includes dust having a diameter of 75 microns or less that can be re-scattered on the road, and its content is determined by diameter. Subsequently, the lid of the sample mounting portion is closed, a predetermined volume of water is injected through the water injection portion, and vibration is applied to the sample using the vibration portion. This process is a process for inducing clogging, in which the air gap of the road pavement is partially blocked by dust. The road pavement in which clogging is induced in this way simulates the pavement contamination in the real road environment. At this time, the motor constituting the vibration unit of the vibration induction unit may induce vibration at a frequency of 50 to 200 Hz. Finally, the sample is dried by hot air to simulate the condition of the road pavement inducing clogging. The hot air drying may be additionally installed in the re-fugitive dust collecting device, or a separate hot air fan may be used. The hot air drying unit may be installed on the upper part of the sample in the re-scattering dust collecting device.

The second process, the process for measuring fine dust absorption, is as follows. First, dust is injected on top of the sample. The dust is a standardized sample and can be 'Arizona Dust' containing less than 75 microns of dust and injected into a predetermined mass or volume. The injected dust can be evenly distributed on the sample surface using a broom. Subsequently, water is injected onto the injected dust. The water is injected using a water injection part, and is injected in a predetermined volume. Subsequently, a vibration is applied to the sample using the vibrating unit, and the vibration is for easily infiltrating the pores of the pavement. Subsequently, a dispersion of water and dust passing through the sample is passed through the filter unit. A plurality of filter parts may be formed, and the size of the pores may be smaller as it goes from top to bottom. The pore size of the final filter can be set to 75 microns, the diameter of re-dispersible dust. Finally, the mass of the fine dust collected in the fine dust collecting container is measured. The dispersion liquid that has passed through the last filter is stored in a fine dust collecting container, and the fine dust collecting container is separated and put in an oven to evaporate water while leaving it sufficiently. When the mass of the fine dust collecting container is measured while the water is completely evaporated, the value obtained by subtracting the weight of the collecting dust itself becomes the weight of the fine dust. As the mass of the collected fine dust is larger, it can be evaluated as a road pavement material having a higher absorbency of fine dust.

Although not shown in the figure, the step of measuring the light transmittance of the fine dust dispersion may be added using an optical means before the step of separating the fine dust collecting container and measuring the mass. At this time, it is possible to maintain the dispersion by applying vibration to the fine dust collecting container, and optical light sources and optical sensors may be installed on the ground support free from vibration. When data on light transmittance change according to the mass of fine dust measured through repeated experiments is secured, it is possible to compare and evaluate the relative performance of road pavement without measuring the fine dust mass.

The above description is to explain the technical idea of the present invention by using one embodiment, and those skilled in the art to which the present invention pertains will be capable of various modifications and variations without departing from the essential characteristics of the present invention. . Therefore, the implementation examples described in the present invention are not intended to limit the technical spirit of the present invention, but to explain the scope of the technical spirit of the present invention. The scope of protection of the present invention should be interpreted by the claims, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

100: road re-scattering dust reduction performance evaluation device
110: water injection unit 120: sample mounting unit
121: sample fixing frame 121a: vertical plate
221b: lower plate 121c: drain
121d: lid 122: sealing portion
130: hopper 131: spotter
140: dust collecting unit 141: upper stopper
142: first filter unit 143: second filter unit
144: third filter unit 145: fine dust collecting container
150: lower support 160: vibration induction
161: support frame 162: vibration unit
163: elastic member 170: ground support

Claims (5)

Apparatus for evaluating the performance of reducing road scattering dust,
A sample mounting unit for fixing the road pavement sample;
A water injection unit mounted on the sample mounting unit to inject water onto the sample;
A hopper coupled to the lower portion of the sample mounting portion to provide a path for collecting and discharging water to the central portion; And
Dust collecting performance mounted on the bottom of the hopper; Road re-flight dust reduction performance evaluation apparatus comprising a. The method according to claim 1,
The dust collecting part includes a plurality of filter parts having different pores, and a dust collecting container for storing water and dust that has passed through the filter part, wherein the apparatus for evaluating dust reduction performance of road scattering is reduced. The method according to claim 1,
Road re-scattering dust reduction performance evaluation device, characterized in that it further comprises a vibration inducing portion for generating vibration in the sample mounting portion. The method according to claim 1,
The sample mounting portion is a road re-flight dust reduction performance evaluation device comprising a sealing portion for sealing the lower edge of the sample. In the method for evaluating dust reduction performance using the apparatus for evaluating dust reduction of road re-scattering,
Mounting the sample to the sample mounting portion;
Introducing a contaminant over the sample;
Injecting water into an upper portion of the sample into which the contaminants are added;
Imparting vibration to the sample injected with water;
Drying the sample by hot air;
Inputting dust onto the hot air dried sample;
Injecting water into the dust-injected sample;
Imparting vibration to the sample injected with water;
Collecting dust passing through the sample into a dust collecting container using a filter unit;
Drying the dust collecting container in which the dust is collected; And
The dried dust collecting container is a step of measuring the mass of dust; Method for evaluating the performance of reducing dust on a road re-including.

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