KR100353344B1 - Air purifier - Google Patents

Abstract

The present invention relates to an air purifier that prevents the filter from being clogged by particulate contaminants contained in the air during air purification and prevents the purification efficiency from being lowered due to the pressure load in the apparatus.

In the conventional cleaning air purifier, there is a problem that the gap between the spheres 20 constituting the first filter unit 2 is blocked. Therefore, the present invention provides a plurality of spheres ( In the case where the first filter unit 2 composed of 20, a plurality of spray nozzles 3 for spraying the cleaning liquid, and a second filter unit 4 for separating and removing moisture contained in the discharged air are provided. In addition, the spherical body 20 constituting the first filter unit 2 is irregularly stacked on the upper part of the plate body 5 having the through hole 50 so that the spherical body 20 may be installed to flow, and the plate body ( By forming the injection nozzle 3 for spraying the cleaning liquid toward the first filter part 2 in the lower part of 5), the particulate matter in the bubble layer generated by the flow phenomenon of the sphere constituting the first filter part To improve the collection efficiency of the Not to be expected energy costs as well as operating cost savings that can and will hence improve removal efficiency than the existing facility for the removal of high concentrations of particulate matter.

Description

Air Purifier {Air purifier}

The present invention relates to an air purifier for filtering particulate contaminants contained in air, and more particularly, to prevent the filter from being blocked by particulate contaminants contained in the air during air purification, and to prevent pressure in the apparatus. The present invention relates to an air purifier that can prevent the purification efficiency from being lowered due to the load.

There are many air purifiers that can filter out contaminants contained in the air to release only clean air. However, the air purifiers to be dealt with in the present invention spray pollutants into the air flowing into the apparatus to contaminate the air. A clean air purifier for separating and removing material.

In general, a method of treating a cleaning air purifier is to separate and collect contaminants of fine particles contained in the air by droplets, liquid films, bubbles, etc. generated by spraying the cleaning liquid into the air to be cleaned.

Principle of separation collection is mainly inertia, gravity, diffusivity, cohesion, etc. The larger particles of pollutant are governed by gravity and inertia, and the finer air diffusion and cohesive force have larger dust collection force. .

In the case of fine particles, the particle size is increased by diffusion and agglomeration, and in the case of pollutants having large particle sizes, they are collected by gravity and inertia force, thereby purifying the air while repeating the recovery reaction with water.

These cleaning air purifiers are divided into counter-current trending cross-flow type, etc. according to the direction of gas and liquid, and generally use counter-flow method for absorbing harmful gas. It is used to purify air containing particles.

In the conventional cleaning type air purifying apparatus, as illustrated in FIG. 1, the first filter unit 2 including the plurality of spheres 20 is provided inside the tank 1, and the first filter unit 2 includes the first filter unit 2. A plurality of injection nozzles 3 for injecting a cleaning liquid is installed on the upper part of the filter part 2, and a second filter part 4 is installed on the upper part of the injection nozzle 3. A plurality of spheres 20 constituting the (2) is fixed in the frame 22 so that there is no flow, the second filter portion 4 is configured in a structure that can remove the moisture contained in the discharged air It is.

In the conventional air purification device configured as described above, when air to be purged through the inlet pipe 10 is blown into the tank 1 by the blower, the air constitutes the first filter part 2. The bulky contaminant particles are filtered while passing through the gap formed between the spheres 20 and the air containing the fine contaminants is moved to the upper portion of the first filter part 2.

At this time, the cleaning liquid is injected from the injection nozzle 3 installed on the upper part of the first filter unit 2 to remove the fine contaminants contained in the air, and the contaminants of the fine particles contained in the air by the droplets, liquid films, bubbles, etc. as described above. To be captured.

The air passing through the first filter part 2 is provided with a large amount of moisture, the air is absorbed while passing through the second filter part 4 and the air discharged through the discharge pipe 11 is contaminated with Only clean air with no moisture is released.

However, the conventional cleaning air purifier configured as described above has the following problems.

That is, when the air containing the high concentration of solid material is introduced, the solid material is caught in the gap between the spheres 20 constituting the first filter unit 2, thereby inhibiting the flow of the incoming air, which is a tank. After a certain time, the air flow rate decreases and the pressure loss increases, causing a problem that the suction force of the blower is lowered, and eventually the gap between the spheres is blocked.

The present invention has been made to solve the above-described problems, the present invention is to prevent the filter is blocked by particulate contaminants contained in the air during air purification, purification efficiency is reduced due to the pressure load in the device It is an object of the present invention to provide an air purifier that can be prevented.

The present invention is configured as follows to achieve the above object. That is, in the present invention, the first filter portion composed of a plurality of spheres, the plurality of injection nozzles for injecting the cleaning liquid, and the second filter portion for separating and removing the water contained in the discharged air are provided in the tank. And, the sphere constituting the first filter portion is irregularly installed on the upper portion of the plate body having a through hole so that the sphere can be flowed, and to form a spray nozzle for spraying the cleaning liquid toward the first filter portion in the lower portion of the plate body, The 2nd filter part is comprised by providing many zigzag plate bodies inside.

1 is a cross-sectional view showing a cleaning air apparatus according to the prior art.

2 is a cross-sectional view showing an air purifier according to the present invention.

3 is a cross-sectional view showing an extract of a first filter part, which is an essential part of the present invention;

4 is a cross-sectional view showing an extract of the second filter part of the present invention.

5 is a graph showing a comparison of the dust collection efficiency change between the air purifier and the conventional air purifier according to the present invention

Figure 6 is a graph showing a comparison of the pressure loss generated in the filter unit of the air purifier and the conventional air purifier according to the present invention

7 is a graph illustrating a comparison of dust collection efficiency according to particle size of particulate contaminants included in air;

<Explanation of symbols for the main parts of the drawings>

1. Tank 2. First filter part

3. Injection nozzle 4. Second filter part

20. Sphere 40. Plate

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing an air purifier according to the present invention.

The present inventors have to maintain the optimum condition of each filter to remove moisture from the air pressure and mist of air flowing into the tank, the operation state of the device, the specific surface area of the filter medium, and the contact time of gas and liquid. Only has found that it is possible to prevent the failure of the cleaning air cleaner and to maximize the purification efficiency.

In order to effectively treat such pollutants in the particulate state, the present invention is a trend (20) in which the air to be purified and the cleaning liquid proceed in the same direction, and constitute the first filter part (2). ) And a plurality of zigzag plate bodies 40 are provided inside the second filter part 4 so as to allow flow to flow and to effectively separate and remove moisture contained in the air.

In general, the principle that the pollutant is treated in the cleaning air purifier is expressed as follows.

[Equation 1] Inertia Collision Separation Coefficient

N = ρr. df. V. Cf / 18. μ. dw

N: inertia collision coefficient

ρr: density of particles

df: diameter of the particle

dw: diameter of the droplet

V: flow velocity of air

μ: viscosity of the particle

Equation-1 is an empirical formula showing the separation coefficient due to inertial collisions acting in the treatment of particulate matter.

As in Equation 1, the inertia collision coefficient is proportional to the particle density, diameter, and air velocity, and inversely proportional to the diameter of the droplet and the viscosity of the particle.

In this way, the particle density and the diameter of the particles are made large and the air velocity is maintained as fast as possible, the separation coefficient is high, and when spraying the diameter of the sprayed droplet as fine as possible, a good effect can be obtained.

[Experimental Formula-2] Estimated Efficiency of Treatment of Particle-Contaminants and Water in Air

η = 1-exp ｛(-2/3) x π x A x L x ηt｝

* A = specific surface area of the sphere

* L = thickness of the first filter part

* ηt = target capture efficiency

Equation 2 shows the removal efficiency expected to treat particulate contaminants in the cleaning air purifier.

In Equation-2, the collection efficiency is directly related to the collection efficiency of the specific surface area of the sphere, the installation thickness of the sphere, and the target collection efficiency.

The specific surface area refers to the area occupied by the sphere 20 per volume, which determines the speed of air and the amount of installation of the sphere 20.

The larger the specific surface area, the lower the installation height of the sphere 20 and the larger the porosity, so the lower the pressure loss, the inner diameter of the tank 1 can also be designed smaller.

Therefore, the liquid cost is low, the pressure loss is significantly lowered, so it is possible to reduce the power and operating costs.

The higher the installation height of the sphere 20, the better the dust collection efficiency, but if the height increases, the pressure loss rises rapidly, and a clogging phenomenon occurs in the first filter unit 2.

As a result, the treatment efficiency and the suction power of the blower are lowered, which causes the overall problem, so selecting an appropriate height is most important.

In the present invention, the first filter part 2 is configured as a sphere 20 that can smoothly flow by the inflow speed of air in the tank 1.

In addition, a second filter part 4 composed of a plurality of plate bodies 40 having a zigzag shape was provided at the rear end of the tank 1.

In addition, an injection nozzle 3 for injecting a cleaning liquid in the lower part of the first filter part 2 is provided so that the flow direction of the air to be purified and the spraying direction of the cleaning liquid are the same.

The sphere 20 constituting the first filter unit 2 used a glass ball of a very small size so that it can be easily moved by the flow pressure of air and maintain the specific surface area as wide as possible.

Referring to the operation of the air purification device of the present invention configured as described above are as follows.

The air to be purged introduced into the tank 1 by the blower is moved to the lower part of the first filter part 2 together with the cleaning liquid injected from the injection nozzle 3, and in this process, the large particles contained in the air The contaminants collide with the plate 5 provided below the first filter part 2 to fall and be washed off with the cleaning liquid.

The air introduced into the first filter part 2 together with the cleaning liquid passes through the bubble layer 21 formed on the first filter part 2 while passing through the first filter part 2.

The foam layer 21 is formed to a height of approximately 150mm, and contaminants of a small size contained in the air pass through the foam layer 21 and have a long contact time with the cleaning liquid and are mostly collected together with the cleaning liquid.

At this time, the sphere 20 constituting the first filter unit 2 is slightly flown to the upper portion as well as the lower portion by the air flow so that clogging due to contaminants does not occur.

The cleaning liquid contaminated by collecting contaminants flows into the recovery water tank 26 through the drain port 25 installed on the upper part of the first filter part 2, and the sludge deposited on the lower part of the water tank is transferred to the outside through the conveyor. The discharged and clean supernatant is continuously circulated by the circulation pump 27 to operate.

The air passing through the first filter part 2 flows into the second filter part 4 in which the zigzag plate body 40 is installed, and the moisture contained in the air is condensed on the plate body 40, and only the clean air is discharged. It is discharged through (11).

The zigzag-shaped plate 40 is a kind of obstruction plate and is arranged to be inclined at approximately 45 ° in the flow direction of air.

Air passes through the plate body 40 installed in multiple rows at a rate of 4-5M / SEC, while water contained in the air collides with the plate body 40 by inertial force, flows along the surface of the plate body, and is provided at the end of the pocket 41. Suction into the water and collected in the pocket 41 is discharged downward by gravity.

The number of spheres 20 and plate 40 installed inside the device plays a direct role in the purification efficiency, but if too much installation, excessive power and operating costs due to increased pressure loss may cause excessive blockage, etc. It is desirable to install and use according to the proper removal efficiency.

Change of treatment efficiency of pollutant

The air purifier of the present invention was operated while varying the concentration of the iron compound to 1-50 g / m 3 in the incoming air.

Operation conditions were measured in Pilot-Scale as shown in Table-1 below.

TABLE-1

Treatment air volume Packed bed height Liquid Filling tower diameter Tower speed 30CMM 80 mm 1ℓ / ㎥ ø560 2㎧

5 is a graph showing changes in dust collection efficiency of the air purifier and the conventional air purifier according to the present invention.

In the conventional air purifier, a phenomenon in which dust collection efficiency is improved while increasing the pressure loss in the filter unit can be seen.

Increased dust collection efficiency is expected due to increased pressure loss, but this leads to an increase in the power cost of the blower and a decrease in the amount of air inflow, resulting in a decrease in the total collection amount.

However, in the case of the air purifier according to the present invention, it can be seen that the proper collection efficiency can be operated while maintaining a constant pressure without any further change in pressure loss, thereby reducing power and operating costs and improving the collection efficiency.

6 is a graph showing changes in pressure loss generated in the filter unit of the air purifier and the conventional air purifier according to the present invention.

The air purifier of the present invention can be seen that there is an advantage that can effectively cope with the change in the concentration of particulate contaminants by maintaining a constant pressure loss in the filter unit by the concrete flow phenomenon of the filter unit and the height of the foam layer.

7 is a graph showing a comparison of dust collection efficiency according to particle size of particulate contaminants included in air.

As shown in the graph, it can be seen that in the purifier according to the present invention, as compared with the conventional purifier, the air passing through the sphere passes through the bubble layer, thereby increasing the contact time between the gas and the liquid, thereby improving the treatment efficiency.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

As described above, according to the present invention, it is possible to improve the collection efficiency of particulate contaminants in the bubble layer generated due to the flow phenomenon of the sphere constituting the first filter part and to prevent the clogging phenomenon of the first filter part. Of course, the operating cost can be reduced and the removal efficiency can be significantly improved compared to the existing facilities for removing high concentration of particulate matter.

In particular, the present invention can adjust the installation amount of the sphere and the height of the foam layer can be used to smoothly control the increase and decrease of the pressure loss by using it can actively cope with changes in the concentration of pollutants contained in the incoming air Has the advantage.

Claims (2)

delete The first filter unit (2) consisting of a plurality of spheres (20) in the tank (1), a plurality of injection nozzles (3) for injecting the cleaning liquid, and agent for separating and removing the water contained in the discharged air The spherical body 20 is composed of two filter parts 4, and the spherical body 20 constituting the first filter part 2 is irregularly stacked on the upper part of the plate body 5 having the through hole 50 so that the spherical body 20 flows. In this case, the injection nozzle 3 for injecting the cleaning liquid toward the first filter part 2 is formed in the lower part of the plate body 5, and the second filter part 4 is formed therein. An air purifier, characterized in that a plurality of zigzag plate body 40 is installed.