WO2017138727A1

WO2017138727A1 - Air purification apparatus using water filter

Info

Publication number: WO2017138727A1
Application number: PCT/KR2017/001321
Authority: WO
Inventors: 오순봉
Original assignee: 주식회사 에이런
Priority date: 2016-02-11
Filing date: 2017-02-07
Publication date: 2017-08-17
Also published as: KR20170094676A

Abstract

The present invention relates to an air purification apparatus which: very effectively treats contaminated gas by having high and wide ranges for mass ionization and fine water particle generation, and by continuously sustaining same; sustains almost no damage to an internal reaction tank from water spray collisions even under strong water spray conditions; generates no pressure differential as the gas flow is not disturbed; can treat up to power-plant-level mass volume; and can eliminate fine dust without a filter.

Description

Air Purifier Using Water Membrane Filter

The present invention relates to an air purifying apparatus using a water film filter, and more particularly, to an apparatus for purifying air using a water film (atomization) filter formed by generating water particles and ions by colliding with water to face each other. It is about.

NOx, SOx, PM, HC, etc. generated after burning fossil raw materials used in power plants and ships, toxic gases used in semiconductors and other manufacturing processes, and H ₂ S, HF, Cl ₂ , SF _6, NF ₃ . Air pollutants such as dioxins, warming substances and fine dust generated after the waste treatment or the like are usually removed by an adsorption purifier, a wet purifier using a chemical solution, a complex biopurifier using a wet and biofilter, and the like.

The adsorption purifier has a problem that air purification efficiency is low because it is blocked by fine dust contained in the air to be purified or does not actively react with harmful substances contained in the air to be purified.

The wet purifier neutralizes the acidic harmful substances and alkaline harmful substances by contacting the air to be purified with the spray chemical liquid, and removes some water soluble (SOx) contaminants and particulate fine dust (10-40 μm) to purify the air. There is a problem that the spray chemical liquid is not in contact with the fine dust contained in the contact, and the contact between all the harmful substances contained in the air and the chemical liquid sprayed is not made, resulting in low air purification efficiency.

The bio-cleaner combines the air to be purified with the spray chemical to neutralize and purify the acidic and alkaline harmful substances, and then removes the acidic and alkaline harmful substances contained in the air to be purified by the biofilter. If the microorganisms parasitic parasites excessively extinguish the harmful substances or come into contact with the harmful substances of the upper pole has a problem that is directly direct.

Purifier using this problem is disclosed in Korea Patent Registration No. 10-0775035. The purifier disclosed above purifies the air by causing the air to be purified to flow through a plasma atmosphere to ionize oxygen and nitrogen in the air to generate negative ions electrically, but immediately react with the cations to return to neutral and generate harmful ozone and nitrogen oxides. This is not only efficient, but also requires a high voltage in order to generate plasma, resulting in high energy consumption.

Water has a chemical action that dissociates as one of its physical and chemical properties.

Water consists of two hydrogen atoms and one oxygen atom, and this water molecule is separated into one proton and one hydroxide ion.

_{^{H 2 O ↔ H + + OH}} -

So that the starting point of the chemical action of water, separated, and H ⁺ is to not be present alone in the water attaches to the ^{_{H + + H 2 O → H}} 3 O + present.

This _{_{H 2 O + H 2 O ↔}} H 3 O + + OH - is the same meaning as would be the water molecules dissociate into protons and hydroxide ions.

Oxygen atoms that make up water molecules hold hydrogen atoms on both sides. The hydrogen atom is very small and the oxygen is relatively large so that the hydrogen atom is attached to the oxygen atom on both sides. At this time, the oxygen atom has 8 electrons and protons, and there is only one hydrogen. The electrons in are repulsed by the electrons in oxygen, causing the protons to move closer to the oxygen and the electrons to the other side.

As a result, the force to pull the side grows oxygen hydrogen is lost electrons to the phenomenon of separation into protons and hydroxide ions occurs, a water molecule H ₃ O ⁺ and OH ^- divided into.

This phenomenon is a natural phenomenon that occurs naturally in the atmosphere by ultraviolet rays, lightning, and removes pollutants generated from the ground.

As a method for artificially forming ionization, there is a method obtained by adding an energy source to water.

However, the above method of obtaining ionization by applying an energy source to water has a known problem that the half-life (10 ^-9 to 10 ^-7 seconds) in which OH ^- radicals are generated and disappears is very short.

Accordingly, the present invention is to solve the above problems, but uses a principle (ionization) to the static electricity caused by the water, OH ^- by continuously generating the radical,, maintain and, and activation, the contamination particles contained in the air There is a problem to provide an air purifying apparatus for removing.

In addition, the present invention is a device for purifying the air by natural dropping by gravity by contaminating a large amount of contaminated particles that do not react with OH ^- radicals in the space where the water film (atomization) is formed to be fine particles and fine dust and It is a problem to provide an air purifying apparatus which has a long contact time and a large area with micronized water to increase polluted particles contained in the air.

The principle of generating static electricity by water (ionization) is the principle that static electricity is generated when water is strongly rubbed, flowed, jetted, collided or destroyed.

The principle of the generation of static electricity is related to the structure of matter, all matter is made up of atoms, and atoms are made up of a centrally charged nuclear nucleus and negatively charged electrons circling the nucleus. At this time, since the charge amount is the same, it is electrically neutral.

When two objects are contacted, some of the electrons in the atom of one object are freely moved between the two atoms without being bound, and the atom from which the electron escaped as one of the atoms that were contacted fell off and carried the electron The absorbed atoms are negatively charged.

This charge of the object is called charging, and the representative one is Kelvin's droplet electrostatic generator.

Such charging methods include contact charging, friction charging, peeling charging, flow charging, jet charging, collision charging and the like.

Contact charging occurs when two different objects are in contact with each other, but even the same kind of object generates static electricity due to separation after contact due to the difference in surface condition.

Triboelectric charging is a phenomenon in which charge separation occurs when a friction occurs between an object and is mainly caused by a solid or liquid powder stream.

Peeling charge is a phenomenon in which charge separation occurs when objects close to each other drop and static electricity is generated, and it occurs when the chain structure of water is finely divided and split. At this time, the size of the static electricity is determined by the area of the contact surface, adhesion force, separation speed, etc., the greater static electricity than the triboelectric charge occurs.

Flow charging is the phenomenon in which static electricity occurs when a liquid such as water or oil flows through a pipe, and the moving speed of liquid determines the strength of static electricity.

Jet charging is a phenomenon in which powder, liquid, and gas are caused by friction when ejecting from a jet having a small cross-sectional area. The cause of static electricity is also affected by the collision between the static electricity generated by the jet between the ejecting object and the ejecting outlet and the ejecting object, and the particle size of the scattering object. In general, the known strength of static electricity is more affected by the particle size of the jets and the collision between the jets and the scattering than the friction between the jet and the jet.

Collision charging is a phenomenon in which static electricity is generated because of rapid contact and separation by collision of particles.

Determining the size of each charge is influenced by the size of the contact area between the two objects, the pressure between the two objects, the frequency of friction, the frictional speed, the temperature difference, and the humidity. It is determined by the atomic structure, the shape and shape of the object, and the surface state of the object.

Therefore, the present invention is an air purifying apparatus which maintains the temperature of water by raising the temperature, continuously applying a high pressure energy source and releasing it at high pressure to continuously break the chain structure of the water, and the high pressure injection of the upper and lower parts facing each other. Water generated from the nozzles collides with each other and generates high static electricity (millions of volts) while minimizing water particles due to the high collision energy generated by collisions. As in the development, the above problem can be solved by providing an air purifying apparatus that decomposes contaminants or coalesces and removes contaminants.

The present invention has a large, wide, and continuously maintained range of ionization and fine water particle generation by means of the above-mentioned problem solving means, so that the treatment of contaminated gas is very effective, and the water injection can be carried out even under strong water spray conditions. There is almost no damage inside the reaction tank due to the collision, it does not interfere with the flow of gas, it does not generate a differential pressure, it can handle up to a large capacity of the power plant class, and it is possible to use an air purifier that can remove fine dust (less than 1 micro) without a filter. Can provide.

1 is a conceptual diagram of an air purifying apparatus using a water film (atomization) filter according to an embodiment of the present invention,

FIG. 2 is a schematic piping diagram for feeding water to a plurality of upstream and downstream nozzles for making the water film (atomization) filter of FIG. 1; FIG.

3 is a schematic diagram showing a process of purifying in the water film (atomization) filter of FIG.

4 is a table showing numerical values purified by the air purifier of FIG. 1;

5 is a table showing numerical values purified by the air purifying apparatus of FIG. 1, unlike the conditions of FIG. 4;

6 is a conceptual diagram of an air purification apparatus using a two-stage water film (atomization) filter according to another embodiment of the present invention;

7 is a conceptual diagram of an air purifier using a one-stage water film (atomization) filter according to another embodiment of the present invention.

8 is a conceptual diagram of an air purification apparatus using a two-stage water film (atomization) filter according to another embodiment of the present invention, in which a pollutant gas flows from the bottom to the bottom and back again. Conceptual diagrams, and

9 is a conceptual diagram of an air purifier using a two-stage water film (atomization) filter according to another embodiment of the present invention, in which a pollutant gas flows from the top to the bottom again, a conceptual diagram.

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

In FIG. 1, an air purifier using a water film (atomization) filter formed by generating fine particles and ions according to an embodiment of the present invention is indicated by reference numeral 100.

As shown in FIG. 1, the air purifier 100, the lower end of the upstream end is connected to the downstream end of the polluted air supply line 11, and the upper end of the downstream end is downstream of the clean air outlet 12. An internal reaction tank 10 connected in circulation to the stage, an external collection tank 20 which is spaced radially apart from the internal reaction tank 10, and surrounds the internal reaction tank 10, and the polluted air supply line 11. For example, a screw-like or cyclone inlet-shaped vortex derivative 30 disposed below the inner reaction tank 10 downstream from a downstream end of the downstream side is spaced apart upward from the vortex derivative 30. A plurality of upstream side nozzles 40 are disposed in the inner reaction tank 10 spaced apart in the circumferential direction and radial direction, and are spaced upwardly downstream from the plurality of upstream side nozzles 40. Place inside the internal reactor (10) The plurality of downstream nozzles 50, which are spaced apart in the direction and radial direction and are opened upstream, the inner reaction tank 10 and the outer collection tank 20 to distribute to each other. Is disposed between the at least one flow port 60 formed in the upper wall portion, the plurality of downstream nozzles 50 and the clean air discharge port 12 contained in the air passing through the plurality of downstream nozzles 50. A baffle having a shape in which the heavy particles and the moisture collide with the heavy particles and the moisture and guide the heavy particles and the moisture to the collecting space formed between the inner reaction tank 10 and the outer collecting tank 20 via the plurality of distribution ports 60. It contains 70.

An inner drain port 13 is connected to a lower end of the inner reaction tank 10, and an outer drain flow port 23 circulating with the inner reaction tank 10 is connected to a lower end of the outer collection tank 20. have.

An upstream end of the contaminated air supply line 11 is connected to a contaminated air supply source (not shown), and in the middle of the contaminated air supply line 11, the temperature of the contaminated air to be conveyed is increased to activate the reactivity. For example, a heating element 14 capable of warming to 60 to 100 ° C. may be interposed.

The plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 are connected to a water supply tank 80 at an upstream end thereof, and are supplied with a high pressure pump 85 sequentially in the water flow direction. It is connected to the downstream end of the line 81. In addition, an ionization activity assisting device 86 may be interposed at a portion of the water supply line 81 located downstream of the high pressure pump 85 of the water supply line 81.

As shown in FIG. 2, the water supply line 81 includes two branch lines 81a, in which

pressure control valves

87 and 88 and on / off

valves

82 and 83 are sequentially disposed in the water flow direction along the way. 81b) and connected to the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40, and the two branching

lines

81a and 81b are in the middle of the nozzle

flow control valves

87a and 88a. Is connected to the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 via a plurality of second branch lines 89.

The high pressure pump 85 forms a pressure of 10 to 1,000 bar to allow water to flow in the water supply line 81, and the water controls the

pressure regulating valves

87 and 88 and the opening and closing

valves

82 and 83. It sequentially feeds to the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 sequentially.

The high pressure pump 85 may be interposed in the

branch lines

81a and 81b, respectively.

The water supplied from the water supply line 81 is sprayed at a high pressure in a direction facing each other through the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40, and thus the plurality of downstream nozzles ( A water film (atomization) filter 90 is formed in the internal reaction tank 10 between the plurality of

upstream nozzles

50 and 50 to form a large number of water particles and ions.

This will be described in detail as follows.

The plurality of downstream nozzles 50 has an orifice of 0, 1 to 8 mm, and the plurality of upstream nozzles 40 have the same quantity and diameter as the plurality of downstream nozzles 50, Water particles are strongly sprayed upwards by the upstream nozzle 40 to elevate and refine the water particles by primary ionization and refinement.

The first ionized and micronized water particles moving downstream are strongly sprayed by the plurality of downstream nozzles 50 upstream and strongly facing in the direction of the second with water particles moving upstream. Immediately colliding, a water film filter 90 is formed which generates a large amount of ionization (hydroxyl groups) and fine particles.

Here, the pressure sprayed from the plurality of upstream nozzles 40 is adjusted to 10 to 50% lower than the plurality of downstream nozzles 50, and then adjusted by the

pressure regulating valves

87 and 88 to make a water film. The filter 90 may be formed.

In order to optimize the polluted gas purification, any one of the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 may be provided with a height adjuster (not shown). The distance between the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 may be adjusted by the height adjuster, for example, about 30 to 900 mm.

In addition, the angles sprayed from the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 may be set to 15 to 80 degrees, and the flow rate sprayed is 1 to 100 liters / minute.

In addition, the flow rates injected from the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 may allow the pressure regulating valve to form a water film filter 90 that generates optimum fine water particles and ions. 87, 88 and the

flow control valves

87a, 88a for the nozzle may not be the same.

The temperature of the water stored in the water supply tank 80 is maintained at 25 degrees or more by a heater (not shown) provided in the water supply tank (80).

In the above embodiment, the plurality of downstream nozzles 50 and the plurality of upstream nozzles 40 are arranged in a vertical position in which a plurality of water jetting nozzles are installed in parallel with a traveling direction in which contaminated gas is moved downstream and discharged. Although the upper and lower nozzle portions are provided in one stage, the present invention is not limited thereto, and the upper and lower nozzle portions are installed in two stages, as shown in FIG. As shown in FIG. 7, the pollutant gas inlet 11 is connected to the upper portion of the inner reaction vessel 10 so that the contaminant gas flows from the upper portion to the lower portion in the inner reaction vessel 10 and then to the outer collecting vessel 20. ) May be disposed next to the inner reaction tank 10 to flow up through the at least one outlet 60 to the bottom of the outer collecting tank 20, in which case the vortex generator 30 and the heating The sieve 14 is provided on the upper side upstream, and the nozzle spraying conditions of the upper and lower parts are also changed.

In addition, according to the present invention, as shown in FIG. 8 according to the amount and type of the contaminated gas and the molecular weight of the gas, another internal reaction tank is connected to the internal reaction tank 10 to which the contaminant gas inlet 11 is connected. A distribution port disposed at the top and distributing the internal reaction tank 10 and the other internal reaction tank to each other, the external collection tank 20 is disposed next to the other internal reaction tank, and the at least one distribution The outer collecting tank 20 and the other inner reaction tank are disposed in the lower portion through the sphere 60, and contaminant gas rises from the lower portion of the inner reaction tank 10 and passes through the upper portion of the other inner reaction tank. It may flow down through the at least one outlet (60) down the outer collecting tank (20).

In addition, according to the present invention, as shown in FIG. 9 according to the amount and type of the contaminated gas and the molecular weight of the gas, another internal reaction tank is connected to the internal reaction tank 10 to which the contaminant gas inlet 11 is connected. A distribution port disposed at the upper portion and distributing the inner reaction vessel 10 and the other inner reaction vessel to each other, and an outer collecting tank 20 is disposed on the upper end of the other inner reaction vessel, so that the contaminated gas is It may be flowed down from the top of the reaction vessel 10 to go up again through the bottom of the other internal reaction vessel.

In addition, the entire structure may be horizontal or inclined while the traveling direction of the polluted gas is maintained in the horizontal or inclined direction instead of the vertical direction.

The ionization activity assisting device 86 functions to additionally activate the ionization in the water supplied from the high pressure pump 85 in case the pollutant gas having a high concentration is introduced.

The air purifier 100 using the water film (atomization) filter for generating fine water particles and ions configured as described above may be operated as follows.

Warm air is heated by the heating element 14 interposed in the contaminated air supply line 11 before the air polluting gas and the warming gas (hereinafter referred to as contaminated air) enter the internal reaction tank 10 via the contaminated air supply line 11. In the state that the reactivity is activated, it is introduced into the upstream end of the lower portion of the internal reaction tank (10).

The heated polluted air introduced into the upstream end of the internal reaction tank 10 is vorticed by the guide of the vortex inductor 30 to enter the plurality of upstream nozzles 40.

Here, when the vortex speed of the warm polluted air is a low speed which is not suitable to form an appropriate vortex formation, a blower not shown in the portion of the polluted air supply line 11 located upstream of the heating element 14 is interposed. This blower can generate a vortex speed of 3 to 40 m / sec.

The polluted gas introduced into the internal reaction tank 10 is formed as a vortex by the vortex inductor 30, and in particular, the polluted gas having its own weight rotates along the inner wall of the internal reaction tank 10 to move downstream. do.

As shown in FIG. 3, the vortex rising contaminant gas is water-received and reacted with an ionized hydroxyl group in the course of passing through the water film filter 90, and becomes heavy or 10 microns or more and 2,5 micros or less. The fine dust and insoluble particles having a size of are coalesced with each other by fine sprayed water to become heavier particles, guided by vortex to the inner wall of the internal reaction tank 10, and then naturally fall to the bottom of the internal reaction tank 10. Are gathered together.

The heavier particles that have passed through the water film filter 90 and the plurality of downstream nozzles 50 together with the vortex rising contaminant gas are among the coalesced and heavier particles. Through) into the outer collecting tank 20 is naturally dropped along the inner wall of the outer collecting tank 20 is collected to the bottom of the outer collecting tank 20.

The heavier particles and moisture contained in the contaminated gas that did not descend to the bottom of the outer collecting tank 20 through the distribution port 60 collide with the baffle 70 to guide the baffle 70. Receives again into the outer collecting tank 20 through the distribution port 60 is naturally dropped along the inner wall of the outer collecting tank 20 is collected to the bottom of the outer collecting tank 20.

In this case, the baffle 70 is preferably maintained at 5 to 6 ° C. by a heating means (not shown) to assist in the gas-liquid separation action.

The purge gas passing through the baffle 70 is discharged to the outside through the clean air outlet 12.

In addition, the polluted particles dropped along the inner walls of the inner reaction tank 10 and the outer reaction tank 20 are stored in the polluted particle storage tank (not shown) through the inner drain port 13.

According to the air purifying apparatus 100 using the water film filter configured as described above, for example, as shown in FIG. 4, the purification efficiency is 99% or more when the vertical nozzle interval (350 mm) is narrow and the nozzle injection pressure (80 bar) is high. And, as shown in Figure 5, when the upper and lower nozzle interval (600mm) is wide and the nozzle injection pressure (20bar) is low, the purification efficiency appeared to be more than 97%.

In the air purifying apparatus 100 using the water film filter configured as described above, tens to millions of ions are continuously generated in the process of miniaturizing by colliding with water after the high pressure is discharged from the upper and lower portions by the high pressure nozzle in the region of the water film filter. In addition, by forming a water film filter, the contact area is continuously formed while widening the contact area, and the collection or radical reaction is carried out by incorporating the water-soluble harmful gas or insoluble harmful particulate gas formed into the vortex by the vortex inductor with finely dispersed water. It can be removed by dropping along the inner walls of the inner reaction tank 10 and the outer reaction tank 20 with decomposition specific gravity, and in particular, bulky gas is coalesced with fine water to reduce the volume (1/700 ~ 1,800). Not only does it easily and completely remove 99% of contaminated gaseous substances at low cost, Can provide an effect.

The contaminated particles stored in the contaminated particle storage tank together with the contaminated water through the inner drain port 13 are proposed in the pending patent application No. 10-2016-0010214 filed on January 27, 2016 by the present inventors. The permanent filter assembly can be separated from the contaminated water as a solid and treated separately.

In the above embodiment, the air purifier 100 is the internal reaction tank 10, the outer collecting tank 20, the vortex induction conductor 30, the upstream nozzle 40, the downstream nozzle 50, the circulation for the air purification Although described as including a sphere 60, and a baffle 70, the present invention is not limited to this, and the air purifier 100 is applied to a processing apparatus that is allowed to have an efficiency lower than 99% of the purification efficiency. In the case where the air purifier 100 is essentially provided with only the upstream nozzle 40 and the downstream nozzle 50 in the internal reaction tank 10, the remaining

components

20, 30, 60 described above And 70) may be additionally provided.

In addition, as an alternative embodiment of the embodiment, the outer collecting tank 20 is radially spaced apart from the inner reaction tank 10 by a predetermined interval to surround the inner reaction tank 10 as a whole, and the inside of the inner reaction tank 10 The inner drain port 13 is connected to the lower end, and the outer drain port may be connected to the lower end of the outer collecting tank 20.

Although the present invention has been described in connection with the above embodiments, various air purifying apparatuses and apparatuses included within the spirit and scope of the extended analysis are provided so that the present invention is not limited to the above-described embodiments and encompasses all modifications and equivalents. It is apparent that the air purifying system having the air purifying apparatus may be included.

Claims

At least one internal reaction tank 10 connected upstream with a downstream end of the contaminated air supply line 11 and connected downstream with a downstream end of the clean air outlet 12;

At least one upstream nozzle 40 disposed inside the internal reaction tank 10 and opened in a downstream end direction;

At least one downstream nozzle 50 spaced in the downstream end direction from the at least one upstream nozzle 40 and disposed in the internal reaction tank 10 and opened in the upstream end direction.

The at least one downstream nozzle 50 and the at least one upstream nozzle 40 have an upstream end connected to the water supply tank 80, and a water supply line having a pump interposed sequentially in the water flow direction. 81 downstream,

The water supplied from the water supply line 81 is sprayed in a direction facing each other through the at least one downstream nozzle 50 and the at least one upstream nozzle 40 and immediately collides with each other in a direction facing each other. And a water film filter 90 in which fine water particles and ions are formed in the internal reaction tank 10 between the at least one downstream nozzle 50 and the at least one upstream nozzle 40. Air purifier using water film filter.
The method of claim 1,

Vortex inductor 30 disposed in the portion of the internal reaction tank 10 located downstream of the downstream end of the contaminated air supply line 11 and upstream of the at least one upstream nozzle 40;

Heating element 14 interposed in the middle of the contaminated air supply line 11 to increase the temperature of the contaminated air transported through the contaminated air supply line 11 to activate the reactivity.

Air purifying apparatus using a water film filter, characterized in that it further comprises at least one of.
The method of claim 1,

An outer collecting tank 20 disposed radially spaced apart from the inner reaction tank 10 to be distributed to the inner reaction tank 10 or disposed to be distributed to the side of the inner reaction tank 10;

The heavy particles are disposed between the at least one downstream nozzle 50 and the clean air discharge port 12 and collide with the heavy particles and water contained in the contaminated air passing through the at least one downstream nozzle 50. Baffle 70 having a shape for inducing the moisture to the lower portion of the inner reaction tank 10 or the outer collection tank 20, and

Air purifying apparatus using a water film filter further comprises an inner drain port 13 connected to the lower end of the inner reaction tank (10).
The method of claim 1,

An air purification apparatus using an aqueous membrane filter, characterized in that an ionization activity assisting device (86) is interposed at a portion of the water supply line (81) located downstream of the pump.
The method according to any one of claims 1 to 4,

The at least one upstream nozzle 40 and the at least one downstream nozzle 50 are disposed in the inner reaction tank 10 spaced apart in the circumferential direction and the radial direction,

The water supply line 81 is branched into two branching lines 81a and 81b interposed with pressure regulating valves 87 and 88 and opening and closing valves 82 and 83 sequentially in the water flow direction along the at least one. Is connected to the downstream nozzle 50 and the at least one upstream nozzle 40,

The two branch lines 81a and 81b are connected to the plurality of downstream nozzles 50 and the plurality of downstream nozzles 50 via a plurality of second branch lines 89 interposed with nozzle flow control valves 87a and 88a. An air purifier using a membrane filter, which is connected to an upstream nozzle (40).