KR20030089194A - The room air purifying apparatus using the ultraviolet light source - Google Patents

Abstract

PURPOSE: Provided is an indoor air purifier being capable of purifying indoor air with high efficiency at low cost by eliminating dust and fine particles using a filter at first step, adsorbing odor and hazardous material using an AC/ACF filter at second step and finally deodorizing and sterilizing the treated air using photocatalyst and UV ray at third step. CONSTITUTION: The purifier comprises an inhalator(10) with an air inlet(20) for taking indoor air, a pretreatment filter(30) for eliminating dust and fine particles in the air, an intermediate filter(40), an AC/ACF filter(50) for eliminating odor and hazardous gas in the air, a UV lamp(60) and photocatalyst(70) for sterilizing the filtrated air, and a fan(80) for exhausting the sterilized air.

Description

The room air purifying apparatus using the ultraviolet light source}

The present invention relates to a device for purifying indoor air using photocatalyst-ultraviolet rays, and more particularly, to deal with and deal with air pollution in various indoor spaces at a high efficiency and low cost by unifying deodorization and sterilization using photocatalyst-ultraviolet technology. The present invention relates to an indoor air purifier using photocatalyst-ultraviolet rays, which contributes to the improvement of national health as well as the reduction of social security costs by providing a device.

Conventionally, in order to purify the air, only non-woven type filters using polypropylene (PP) resin fibers or polyethylene (PE) resin fibers are generally used, or electrostatic precipitating electrostatic filters are used.

However, it is possible to filter out dust with this type of filter, but its structure makes it difficult to remove odors or sterilize bacteria. Therefore, although an activated carbon deodorization filter made of activated carbon for deodorization is used, deodorization performance and durability are not good as an activated carbon filter, and there is a problem in that harmful microorganisms contained in the air cannot be sterilized.

In order to solve this problem, indoor air purification using photocatalyst-ultraviolet using photocatalyst material activated by light energy and deodorizing and sterilizing functions has been proposed.

Table 1 below shows the semiconductor and redox potential that can be used as a photocatalyst.

semiconductor Valence Band (V vs. SCE ± 0.1V) Conduction Band (V vs. SCE ± 0.1V) TiO ₂ +3.1 -0.1 SnO ₂ +4.1 +0.3 ZnO +3.0 -0.2 WO ₃ +3.0 +0.2 CdS +2.1 -0.4 CdSe +1.6 -0.1 CaAs +1.0 -0.4 CaP +2.2 -0.1 SiC +1.6 -1.4

In general, the photochemical reaction is dependent on the bonding potential of the semiconductor, TiO2 photocatalyst is most suitable considering the surface area of the catalyst, the bonding potential and economic efficiency.

Since it was discovered in the early 1800's, UV rays began to be used for sterilization purposes around 1877. Today, the range of application is very wide and the types of application are very diverse.

The classification of ultraviolet rays in C.I.E (International Salt Making Committee) is shown in [Table 2].

UV-A 315nm-400nm Near ultraviolet UV-B 280nm-315nm Middle ultraviolet UV-C 100nm-280nm Far ultraviolet rays

The ultraviolet rays are shown to have a specific function inherent with respect to specific wavelengths, and the characteristics according to the wavelengths are shown in [Table 3].

Wavelength range (nm) Strongest wavelength (nm) Action designation Application example 150-200 184.9 Generation of negative ions and ozone Ozone generator Deodorization, Sterilization, Water Treatment 200-280 253.7 Sterilization Sterilization line Sterilization 280 to 320 296.7 Erythema Health ship Photopolymerization, erythema effect 320 to 380 365.0 Chemical reaction Chemical ship Photopolymerization, fluorescent lamp

Deodorization and sterilization using photocatalyst-ultraviolet rays are performed as follows.

1. Light absorption by TiO ₂ semiconductor

TiO ₂ + h υ → e ^- _CB + h ⁺ _VB

2. e ^{- +} h + _VB spread

3. Positive hole reaction

^{h + VB + OH - → OH} ·

^{_{h + VB + H 2 O →}} OH · + H +

OH · + Organic → Organic ⁺

h ⁺ _VB + Organic → Organic ⁺

4. Electronic Reaction

_{^{e - + O 2 → O2 -}} ·

^{_{1) 2O 2 - · + 2H}} 2 O → 2OH · + 2OH - + O 2

^{_{2) O 2 - · + H}} + → HO 2 ·

_{O 2 - · + HO 2 ·} → H 2 O- + O 2

HO ₂ · + HO ₂ · → H ₂ O ₂ · + O ₂

_{^{HO 2 - + H + → H}} 2 O 2

^{_{H 2 O 2 + e - CB}} → OH · + OH -

_{H 2 O 2 + O 2 →} OH · + OH - + O 2

H ₂ O ₂ → hυ → 2OH

OH + OH-> H ₂ O ₂

5.OH + Organic → Organic ⁺

e ^- + Organic → Organic ^-

As described above, when light energy is irradiated on the surface of the TiO ₂ semiconductor, electrons in the TiO ₂ valance band are transferred to the conduction band, and h ^+, which is empty of electrons, remains in the valence band.

At this time, 3.2eV energy corresponding to the band gab is required as the light energy required for electron transfer, and a wavelength shorter than 390nm corresponds to this.

The e ^- _CB (electrons transferred to the conduction band) and h ⁺ _VB (positive hole remaining in the valence band) are diffused on the TiO ₂ surface and subjected to the following continuous process.

The OH · generated through these several steps will react with the organics and destroy the organics.

The present invention was devised to solve the above problems, and an object of the present invention is to remove dust or fine particles by using a filter on the front end and adsorb odor or harmful gas by using an AC / ACF filter, and then a photocatalyst. -To provide indoor air purifier using high efficiency and low cost photocatalyst-ultraviolet that can simultaneously remove odor and sterilization using ultraviolet ray.

The configuration of the present invention for achieving the above object, the inhaler 10 is provided with a discharge port 20 that can take in and suck the air in the room; A pretreatment filter 30 and an intermediate filter 40 connected to the inhaler 10 to remove fine solid materials such as various dusts in the air; An AC / ACF filter 50 for removing various odors and harmful gases in the air; An ultraviolet lamp 60 and a photocatalyst member 70 for sterilizing a small amount of contaminated air; Characterized in that the exhaust fan 80 for discharging the purified and sterilized air to the room.

Here, the ultraviolet lamp 60 may be made of a lamp for emitting ultraviolet rays of 280 ~ 315nm capable of deodorizing and sterilizing action.

Also preferably, the photocatalyst member 70 is a photocatalyst doped carrier in which TiO ₂ is doped into a quartz tube and a ceramic carrier.

1 is a schematic configuration diagram of an indoor air purification apparatus using photocatalytic ultraviolet rays according to the present invention;

2 is an exemplary view of the pretreatment filter of FIG. 1;

3 is an exemplary view of an intermediate filter of FIG. 1;

4 is an exemplary view of the AC / ACF filter of FIG. 1;

5 is an exemplary view of the ultraviolet lamp of FIG.

6 is a sterilization principle of photocatalyst-ultraviolet rays.

<Description of Symbols for Main Parts of Drawings>

10: inhaler 20: outlet

30: pretreatment filter 40: intermediate filter

50: AC / ACF filter 60: UV lamp

70: photocatalyst member 80: discharge fan

Hereinafter, an indoor air purification apparatus using the photocatalytic ultraviolet light of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of an indoor air purification apparatus using photocatalytic ultraviolet rays according to the present invention, FIG. 2 is an exemplary view of a pretreatment filter of FIG. 1, FIG. 3 is an exemplary view of an intermediate filter of FIG. 1, and FIG. 4. 1 is an exemplary view of the AC / ACF filter of FIG. 1, FIG. 5 is an exemplary view of the ultraviolet lamp of FIG. 1, and FIG. 6 is a sterilization principle of the photocatalyst-ultraviolet ray.

Referring to FIG. 1, an inhaler 10 having an outlet 20 for drawing and inhaling air in the room is connected to the inhaler 10 to remove fine solid substances such as various dusts in the air. The pre-treatment filter 30 and the intermediate filter 40, the AC / ACF filter 50 for removing various odors and harmful gases in the air, the ultraviolet lamp 60 for sterilizing a small amount of contaminated air, and It consists of a photocatalyst member 70 and a discharge fan 80 for discharging the purified and sterilized air into the room.

The photocatalyst-UV sterilization is shown in FIG. TiO₂When light energy is irradiated on the semiconductor surface, TiO₂Electrons in the valence band are transferred to the conduction layer and holes are empty in the valence band.⁺) Will remain.

At this time, the energy required to transfer electrons requires energy of about 3.2 eV (electron volt) corresponding to a band gap, and a wavelength shorter than 390 nm corresponds to this. The resulting valence electrons (e- _CB ) (electrons transitioned to the conduction band) and holes (h + _VB ) (positive holes remaining in the valence band) are diffused onto the TiO ₂ surface to undergo a continuous process as shown in FIG.

OH (hydroxyl group) generated through these several steps is a technology that destroys the organic material by reacting with the organic material.

Indoor air purification system using TiO ₂ -ultraviolet technology enables low cost, low volume through innovative technology and process simplification, and enables the generalization of indoor air purification system, and can be processed by conventional methods such as biological treatment. Excellent performance in the purification of non-degradable substances that did not exist.

In addition, by implementing the deodorization and sterilization function in the same system, it is possible to realize a high-efficiency purification function.

The ultraviolet lamp 60 has various shapes shown in FIG.

Here, the ultraviolet lamp 60 uses ultraviolet rays of 280 ~ 315nm capable of both deodorizing and sterilizing at the same time and can be used in various ways from 2W to 120W depending on the size of the purification device.

The photocatalyst member 70 may use a photocatalyst coated quartz tube coated with a TiO ₂ photocatalyst on a quartz tube or a photocatalyst doped carrier in which TiO ₂ is doped into a ceracic carrier, and a photocatalyst coated with TiO ₂ on a SUS plate. Coping plates can be used.

In addition, the photocatalyst is not limited to TiO ₂ , but sterilization and deodorization of air by the photocatalyst-ultraviolet technique.

In addition, the AC / ACF filter 50 is a filter made of activated carbon fiber and activated carbon to remove various odors and harmful gases in the air. have.

In addition, the pretreatment filter 30 and the intermediate filter 40 may be preferably composed of a ceramic filter as a filter for removing dust and the like in the air.

That is, the fine solid material in the contaminated indoor air is removed from the pretreatment filter 30 and the intermediate filter 40, and the odor and various harmful gases in the indoor air are removed from the AC / ACF filter 50. After the photocatalyst-ultraviolet sterilization apparatus, the indoor air can be made comfortable with a simple device and low maintenance cost to sterilize the indoor air.

As described above, according to the present invention, there is an advantage that an air purifier using a photocatalyst can be implemented at low cost by using a relatively inexpensive ultraviolet light without using an expensive plasma light source as an energy source and a simple structure of a purifier. .

And, to use a photocatalyst doped carrier it was doped with TiO ₂ photocatalyst member a TiO ₂ photocatalyst in a quartz tube in a photocatalyst coating a quartz tube or the quartz tube and serak dynamic carrier was coated with the CVD method, and the TiO ₂ in the quartz tube and the SUS plate By using the coated photocatalyst coping plate, it is possible to exhibit extraordinary performance by selecting a method suitable for the conditions according to the installation location and site conditions.

In addition, since the photocatalyst in the photocatalyst member is coated or doped on the media, it can be used semi-permanently, and the treatment efficiency is higher than that of the device by simple adsorption by existing filters, and the deodorization and sterilization can be simultaneously implemented.

In addition, as the public awareness of indoor air purification increases, a large number of people gather and can be used in public places such as hospitals, government offices, schools, department stores, subway stations, etc., where there is a high risk of secondary infection, and at home. There is an advantage.

Claims (4)

An inhaler 10 having a outlet 20 capable of drawing and inhaling indoor air; A pretreatment filter 30 and an intermediate filter 40 connected to the inhaler 10 to remove fine solid materials such as various dusts in the air; An AC / ACF filter 50 for removing various odors and harmful gases in the air; An ultraviolet lamp 60 and a photocatalyst member 70 for sterilizing a small amount of contaminated air; Indoor air purifier using a photocatalyst ultraviolet light, characterized in that the discharge fan 80 for discharging the purified and sterilized air to the room. According to claim 1, wherein the ultraviolet lamp 60, Indoor air purifier using a photocatalyst ultraviolet light, characterized in that the lamp to emit ultraviolet rays of 280 ~ 315nm capable of deodorization and sterilization. The method of claim 1, wherein the photocatalyst member 70, An indoor air purifier using photocatalytic ultraviolet light, characterized in that the photocatalyst doping carrier is doped with TiO ₂ in a quartz tube and a ceramic support. The method of claim 1, wherein the photocatalyst member 70, An indoor air purifier using photocatalytic ultraviolet light, characterized in that the photocatalyst coating plate coated with TiO2 on a quartz tube and a SUS plate.