TW201410309A - Air purification device - Google Patents

Abstract

An air purification device 1 comprises an intake port 3, an outlet port 4 positioned above the intake port 3, a gas-liquid contact section 5 provided between the intake port 3 and outlet port 4 in which air introduced into a housing 2 from the intake port 3 contacts cleaning water, a spraying device 6 which is provided above the gas-liquid contact section 5 and sprays cleaning water onto the gas-liquid contact section 5, a cleaning water storage device 7 which stores cleaning water, and a cleaning water circulation device 8 which circulates the cleaning water. The gas-liquid contact section 5 comprises a mat-shaped fiber assembly, the fiber density of which varies in the thickness direction, wherein a first surface of the fiber assembly is a low-density surface with protuberances, and the other surface of the fiber assembly is a high-density flat surface. The fiber assembly is disposed between the intake port 3 and the outlet port 4, such that the first surface is positioned on the side of the intake port 3, and the other surface is positioned on the side of the outlet port 4.

Description

Air purification device

The present invention relates to an air purification device.

【Background technique】

Conventionally, an air purifying device is used to remove fine particles and gas phase substances contained in the air by bringing the washing water into contact with air.

As an air purifying device of such a gas-liquid contact method, a scrubber which is often used for an air conditioner of an building or an outdoor air processing unit is well known, and in particular, a Raschig ring is used. A packed column device of a packing material such as a ring or a Teller packing is more well known. Although the packed tower is suitable for industrial use, it is not suitable for household use because of the high height of the packed bed and the large size of the device, that is, it is not suitable for purifying the external air of the living space in a house such as a single-family building or a collective house. And the air circulating in the living space.

On the other hand, in the gas-liquid contact type air purifying apparatus, a technique of filling various filling materials in the gas-liquid contact chamber has been proposed, and it is expected that the size of the apparatus can be reduced. As such a filler, for example, a honeycomb structure (see Patent Document 1) or a fiber assembly (see Patent Document 2) can be used.

[First technical literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2007-143936

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2000-288342

Further, for the filling material of the gas-liquid contact chamber, on the one hand, it is required to suppress an increase in pressure loss, and on the other hand, it is required to exhibit excellent performance of removing fine particles and gas phase substances.

However, the filler having a honeycomb structure described in Patent Document 1 can effectively reduce the pressure loss, but the purpose is mainly to remove viruses in the air, and the performance of removing fine particles and gas phase substances is not excellent. Further, the fiber assembly described in Patent Document 2 does not consider the pressure loss and the removal performance of fine particles and gas phase substances at all.

Accordingly, an object of the present invention is to provide an air purifying apparatus which can suppress an increase in pressure loss on the one hand and remove fine particles and a gas phase substance contained in air in a high efficiency on the other hand.

In order to achieve the above object, the air purifying device of the present invention comprises: an air inlet and an exhaust port, which are provided in an air inlet and an air outlet in the frame, and the air outlet is located above the air inlet; the gas-liquid contact portion Between the suction port and the exhaust port, the air introduced into the frame from the air inlet is in contact with the washing water; and the spraying means is disposed above the gas-liquid contact portion to spray the washing water to the gas-liquid contact portion; The washing water storage means stores the washing water; and the washing water circulation means circulates the washing water by supplying the washing water stored in the washing water storage means to the spraying means. The gas-liquid contact portion has a fiber aggregate which is a mat-like fiber assembly having different fiber densities in the thickness direction, and one side of the fiber assembly has a low density and has an undulating shape, and the other side of the fiber assembly is high. Density and has a flat shape. The fiber assembly is disposed between the intake port and the exhaust port, one side of which is located on the side of the intake port, and the other side of which is located on the side of the exhaust port.

In such an air purifying apparatus, since an appropriate water retaining state can be achieved in the fiber assembly of the gas-liquid contact portion, on the one hand, an increase in pressure loss due to the water seal can be suppressed, and on the other hand, excellent particle removal can be exhibited. Performance with gas phase substances, etc.

According to the above, the present invention can provide an air purifying apparatus which can suppress an increase in pressure loss on the one hand and remove fine particles and a gas phase substance contained in the air with high efficiency on the one hand.

1‧‧‧Air purification unit

2‧‧‧ frame

3‧‧‧ suction port

4‧‧‧Exhaust port

5‧‧‧ gas-liquid contact

6‧‧‧ spray nozzle

7‧‧‧Circular trough

8‧‧‧Circulating pump

9, 13, 14‧‧‧ piping

10‧‧‧External water source

11‧‧‧Water supply valve

12‧‧‧Drain valve

15‧‧‧Water retaining layer

16‧‧‧Air blower

50‧‧‧Fiber aggregates

50a‧‧‧ bottom

50b‧‧‧ top surface

51‧‧‧Layer

52‧‧‧Upper layer (low density fiber aggregate)

53‧‧‧Intermediate layer (high density fiber aggregate)

54‧‧‧lower layer (low density fiber aggregate)

Fig. 1 is a schematic view showing a configuration of an embodiment of an air purifying device of the present invention.

Fig. 2A is a schematic cross-sectional view showing a fiber assembly constituting a gas-liquid contact portion of the air cleaning device of the present embodiment.

Fig. 2B is a schematic cross-sectional view showing the configuration of a gas-liquid contact portion of the air purifying device of the embodiment.

Fig. 3 is a graph plotting the particle removal rate and the sulfur dioxide removal rate of the gas-liquid contact portion shown in Fig. 2B versus the ratio of the treatment flux to the spray flow rate.

Embodiments of the present invention will now be described with reference to the drawings.

Fig. 1 is a schematic view showing a configuration of an embodiment of an air purifying device of the present invention.

The air purifying device 1 includes an air intake port 3 provided on a lower side surface of the casing 2, an exhaust port 4 provided on an upper side surface of the casing 2, and a gas-liquid contact portion 5 provided inside the casing 2 at a suction position. Between the port 3 and the exhaust port 4; spraying nozzle (spraying means) 6, spraying the washing water on the gas-liquid contact portion 5; circulating the tank (washing water storage means) 7, storing the washing water; circulating pump (washing The purified water circulation means 8 circulates the washing water by supplying the washing water in the circulation tank 7 to the spray nozzle 6. With such a configuration, in the air cleaning device 1, the air inside the casing 2 is introduced from the intake port 3, and the gas-liquid contact portion 5 is provided. Among them, it is in contact with the washing water sprayed from the spray nozzle 6, thereby purifying the air.

The gas-liquid contact portion 5 is composed of a felt-like fiber assembly having a specific configuration. Thereby, the air purifying apparatus 1 of the present embodiment can suppress the increase in pressure loss on the one hand, and can remove the fine particles and the gas phase substance contained in the air with high efficiency on the one hand. The detailed configuration of the gas-liquid contact portion 5, in particular, the fiber assembly will be described later.

The spray nozzle 6 can spray water droplets having a small particle size in a mist form, so that the spray pattern of the gas-liquid contact portion 5 can be efficiently wetted, and in particular, a fan spray nozzle and a ring spray nozzle are suitable. The fan-shaped spray nozzles are sprayed in a small amount, so that the sprayed water can be dispersed and a wide range of sprays can be performed. The ring spray nozzle is less prone to clogging, and a wide range of spray can be performed by arranging and dispersing the sprayed water in the ascending air stream of the treated air. In addition, the water sprayed from the ring spray nozzle causes the water droplets to become coarse or fine, or both, because the water sprayed from the adjacent nozzles and the water ejected from each other collide with each other. . While the coarsened water droplets are dropped to wet the gas-liquid contact portion 5, the mixed fine particles and the gas phase material can be washed away, and the finely divided water droplets float in the air and are repeatedly refined and coarsened. The fan-shaped spray nozzle and the ring spray nozzle should be arranged in a plurality of ways such that the sprayed water forms a cross or a parallel pattern.

The circulation tank 7 is connected to the external water source 10 through the pipe 9, and the washing water can be replenished and replaced from the external water source 10 by the control of the water supply valve 11 provided in the pipe 9. Further, a drain valve 12 for drainage is provided on the bottom surface of the circulation tank 7.

The circulation pump 8 is connected to the circulation tank 7 through the pipe 13 on the primary side (suction side), and is connected to the spray nozzle 6 through the pipe 14 on the secondary side (discharge side), whereby the washing water can be circulated. In the present embodiment, the circulation pump is provided outside the casing 2, but may be provided inside the casing 2 as long as the washing water is circulated. Further, the circulation pump 8 may be a submerged water pump provided in the circulation tank 7.

The washing water for purifying the air stored in the circulation tank 7 is not particularly limited as long as it is clean water, and tap water, well water, distilled water, pure water, and electrolyzed water can be used.

The air purifying device 1 further includes a water retaining layer (anti-dripping plate) 15 provided above the spray nozzle 6 to prevent the water sprayed from the spray nozzle 6 from scattering. Further, a humidity adjusting means such as a desiccant rotor may be provided above the water blocking layer 15 to remove a large amount of moisture contained in the air purified by the gas-liquid contact method.

Further, above the water retaining layer 15, a blower 16 is provided in front of the exhaust port 4, which gives an upward driving force to the air introduced from the intake port 3 for exhausting air passing through the gas-liquid contact portion 5 from the exhaust gas. The mouth 4 is discharged. Further, the air introduced from the intake port 3 may be discharged from the exhaust port 4, and the exhaust means for discharging the air from the exhaust port 4 may be provided outside the casing 2 instead of the blower 16.

Next, the air purification operation of the air cleaning device 1 of the present embodiment will be briefly described.

When the blower 16 is operated, the inside of the casing 2 is decompressed, and the air to be purified is introduced into the casing 2 from the intake port 3. The driving force of the introduced air is given upward by the blower 16, and flows from the bottom to the top inside the casing 2 to reach the gas-liquid contact portion 5.

On the other hand, the washing water stored in the circulation tank 7 is supplied to the spray nozzle 6 by the circulation pump 8. The washing water supplied to the spray nozzle 6 is sprayed to the gas-liquid contact portion 5 by the spray nozzle 6, and is held by the fiber assembly of the gas-liquid contact portion 5.

The air rising from the lower side of the gas-liquid contact portion 5 is brought into gas-liquid contact in the fiber assembly of the gas-liquid contact portion 5, and the particulate matter and the gas phase chemical substance in the air are removed by the washing water. The purified air is discharged from the exhaust port 4 by the blower 16.

Next, a configuration of a fiber assembly using the gas-liquid contact portion 5 will be described with reference to FIGS. 2A and 2B. 2A is a schematic cross-sectional view showing a fiber assembly constituting the gas-liquid contact portion 5, and FIG. 2B is a schematic cross-sectional view showing a configuration of the gas-liquid contact portion 5 of the present embodiment.

The fiber assembly 50 constituting the gas-liquid contact portion 5 is formed by processing a synthetic resin into a curl shape, and connecting a part of the fibers to each other to form a three-dimensional nonwoven fabric shape. In the fiber assembly 50, the fibers processed into a curl shape are arranged unevenly, and most of the tip end portions (cut portions) are located on one side. Thereby, as shown in FIG. 2A, the surface 50a of one side of the fiber assembly 50 has a low density and has an undulating (unevenness and roughness) shape, and the other surface 50b has a high density and a flat (smooth) shape. The fiber density differs in the thickness direction from one face 50a toward the other face 50b. In the present embodiment, the washing water is sprayed onto the flat surface 50b of the fiber assembly 50, and the air flows in from the uneven and rough surface 50a. In other words, the fiber assembly 50 is provided in the air cleaning device 1 such that the uneven surface 50a constitutes a "bottom surface" and the flat surface 50b constitutes a "top surface".

When the washing water is sprayed onto the fiber assembly 50, the dispersion of the washing water is promoted by the flat top surface 50b, and the moisture is uniformly held on the top surface 50b of the fiber assembly 50. The washed washing water flows through the fibers to the side of the bottom surface 50a because of gravity and capillary phenomenon. As a result, a uniform water retaining state is achieved on the top surface 50b of the fiber assembly 50, and drainage is promoted on the bottom surface 50a.

The material constituting the fiber of the fiber assembly 50 may be any material that can be processed into fibers, and examples thereof include polyamines such as wholly aromatic polyamine, nylon 6, and nylon 66; and polyethylene terephthalate. Polyester such as ester or polybutylene terephthalate; poly(halogenated olefin) such as polyvinyl chloride, polyvinylidene chloride, polyfluorinated ethylene or polytetrafluoroethylene; polyacrylonitrile and polymethyl a nitrile monomer such as acrylonitrile; a polyvinyl ester such as polyvinyl acetate, polyvinyl propionate or polyvinyl alcohol; and a hydrolyzed product thereof; cellulose such as cellulose, acetamino cellulose or rayon Polyolefins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer.

Moreover, since the fiber assembly 50 is used as the gas-liquid contact portion 5, it is desirable to be composed of fibers having little water absorption and chemical resistance. From this point of view, among the fiber materials listed above, polyvinylidene chloride or the like is preferably used.

Moreover, as a bonding method of the fiber assembly 50 (method of producing an aggregate), for example, a thermal bond method in which fibers are melted by heat to bond them, and an adhesive is used. Any method may be used for the chemical bonding method of fiber bonding, the needling method of mechanically bonding fibers by barbed needle punching, and the like.

As the above-mentioned fiber assembly 50, for example, Saran Lock (registered trademark) of Asahi Kasei Home Products Co., Ltd. is mentioned. Saran Lock is a Saran (registered trademark) fiber in which the material itself is an extremely flame-retardant fiber, which is formed into a spring shape by crimping, and is processed into a non-woven fabric, and a three-dimensional non-woven fabric bonded by Saran Latex. Saran Lock is suitable for use because it has a large space and surface area, low ventilation resistance, excellent filtration efficiency, and large dust collection capacity.

As shown in Fig. 2B, the gas-liquid contact portion 5 of the present embodiment has the same configuration as the fiber assembly 50 shown in Fig. 2A, and has three types of fiber aggregates having different average fiber densities stacked in three layers. The laminated body 51. Specifically, the gas-liquid contact portion 5 has a laminated body 51 having an upper layer 52 composed of a fiber aggregate (low-density fiber aggregate) having a relatively low average fiber density; and an intermediate layer 53 by an average The fiber aggregate (high-density fiber aggregate) having a relatively high fiber density is formed; and the lower layer 54 is composed of the same low-density fiber aggregate as the upper layer 52. Here, the "average fiber density" means the degree to which the fibers are arranged to be dense in the entire fiber assembly, and is expressed, for example, by the surface area (specific surface area) of the fibers per unit volume.

The low-density fiber assembly of the upper layer 52 allows the washing water sprayed from the spray nozzle 6 to be uniformly dispersed on the flat top surface to achieve the water retaining effect. The washing water which is uniformly held can be uniformly supplied to the entire intermediate layer (high-density fiber aggregate) having high removal performance such as fine particles and gas phase substances because the gravity and the capillary phenomenon flow down. As a result, the excellent removal performance of the intermediate layer (high-density fiber aggregate) for fine particles and gas phase substances and the like can be exhibited efficiently. Further, in the water retaining state of the top surface, since the average fiber density of the upper layer 52 is low, an excessive water retaining state (water seal state) for increasing the pressure loss is not formed.

The high-density fiber assembly of the intermediate layer 53 can appropriately maintain the washing water flowing down from the upper layer 52, and therefore has excellent removal performance for fine particles and gas phase substances. In addition, by minimizing the water droplets and increasing the gas-liquid contact area, it is possible to enhance the removal of fine particles and gas phase substances. Performance.

Since the low-density fiber assembly of the lower layer 54 is adjacent to the intermediate layer 53 because of its flat top surface, the washing water held in the high-density fiber assembly of the intermediate layer 53 can be discharged. As a result, the effect of maintaining the water retaining state of the intermediate layer 53 moderately can be achieved. Further, the low-density fiber assembly of the lower layer 54 also functions to rectify the air to be treated flowing from the bottom surface.

In addition, the top surface of the fiber assembly of each of the layers 52-54 also causes water droplets to be sprayed upward. Thereby, the chance of contact between the treated air and the washing water can be further increased, and the removal performance for the fine particles and the gas phase material can be further improved.

As described above, the gas-liquid contact portion 5 of the present embodiment suppresses an increase in pressure loss due to a water seal as much as possible, and on the other hand, it has a large specific surface area of a filler (fiber aggregate). structure. Thereby, the chance of contact between the air to be treated and the washing water is increased, and the performance of fine particles and gas phase substances can be excellently removed. Further, the above configuration also has an advantage that the fine particles and the gas phase substance captured by the fiber assembly are easily washed away.

Further, in the present embodiment, the gas-liquid contact portion 5 is composed of a laminate in which two types of fiber aggregates having different average fiber densities are stacked, but the laminate is not limited thereto. The fiber aggregate used may have an average fiber density of more than two, and may be, for example, three. Further, the fiber assembly may be stacked in four or more layers. However, in this case, the fiber assembly constituting the lowermost layer is preferably a fiber aggregate having the lowest average fiber density. This is because, in the lowermost layer, it is necessary to prevent the bottom surface of the fiber assembly from forming a water seal state, thereby suppressing an increase in pressure loss. Furthermore, it is preferable that the fiber assembly constituting the uppermost layer is a fiber aggregate having the lowest average fiber density. This is because the uppermost layer closest to the blower is most likely to form a negative pressure, and if the uppermost layer is a fiber aggregate having a high average fiber density, the water retaining state on the top surface of the fiber aggregate tends to be uneven.

Here, a preferred range of the spray flow rate of the washing water to the gas-liquid contact portion 5 will be described with reference to Fig. 3 .

3, the removal rate of fine particles having a particle diameter of 1 μm and the removal rate of sulfur dioxide (SO ₂ ) using the gas-liquid contact portion 5 shown in FIG. 2B, and the flow rate L of water ejected from the spray nozzle 6 by gas-liquid contact. A plot of the ratio L/G of the flux (process flux) G of the air of the section 5. Further, the data of the removal rate shown in FIG. 3 is obtained by measuring the ratio L/G of the spray flow rate L to the treatment flux G in the conditions of the fifth embodiment to be described later.

As is apparent from Fig. 3, when the treatment flux G is constant, the SO ₂ removal rate and the particle removal rate increase as the spray flow rate L increases, but the pressure difference (pressure loss) also increases. In addition, when the spray flow rate L is small, not only the sufficient removal performance but also the captured fine particles and the gas phase substance may be accumulated in the gas-liquid contact portion 5 . Therefore, the ratio L/G of the spray flow rate L to the treatment flux G is preferably in the range of 0.5 to 3.0. When the ratio L/G is 0.5 or more, the SO ₂ and the fine particles can be sufficiently removed. When the ratio L/G is 3.0, the pressure difference (pressure loss) can be suppressed from increasing, and the removal performance can be sufficiently exhibited.

On the other hand, the air flow rate (line flow velocity) on the top surface of the gas-liquid contact portion 5 is preferably larger than the speed at which the smallest diameter water droplet falls freely among the water droplets sprayed on the top surface of the gas-liquid contact portion 5. Thereby, a part of the water droplets sprayed on the top surface of the gas-liquid contact portion 5 can be made to float. The floating water droplets, on the one hand, diffuse arbitrarily, and on the other hand, collide with other water droplets to become large, and then fall to the top surface of the gas-liquid contact portion 5. Therefore, the washing water can be uniformly sprayed on the top surface of the gas-liquid contact portion 5 without any deviation, and the washing water sprayed on the top surface of the gas-liquid contact portion 5 can be uniformly spread. Further, the floating water droplets are in contact with the air, and when they are combined with the fine particles contained in the air and the gas phase substance, they fall to the top surface of the gas-liquid contact portion 5, so that the fine particle removal rate and the gas phase material removal rate can be further enhanced.

In addition, a part of the water sprayed from the spray nozzle (spray nozzle) 6 is provided in the spray nozzle 6 in the case where the air flowing in from the bottom surface of the gas-liquid contact portion 5 floats upward and is blown upward. The water retaining layer 15 above it is preferably located at a position where the minute water droplets blown up are reached. Thereby, by the water retaining layer 15 capturing the fine water droplets which are blown up by the air flow, the water to be treated can be subjected to the water removing operation. Further, the bottom surface of the water retaining layer 15 forms a water film due to minute water droplets, and the water film can also remove fine particles and gas phase substances. However, if the bottom surface of the water retaining layer 15 When the state of excessive water retention is formed, the air supply resistance is increased, and the pressure loss is increased. Therefore, in order to make the water film formed on the bottom surface of the water retaining layer 15 thicker, since the weight thereof exceeds the surface tension to form droplets falling, it is preferable to use the fibers constituting the gas-liquid contact portion 5. The fiber assembly having the same aggregate is used as the water retaining layer 15 and is provided with an uneven and rough surface as a bottom surface. For the same reason, in the case where the air flow does not exist, the water retaining layer 15 may be provided at a position where the water sprayed from the spray nozzle 6 cannot directly contact.

Further, as the water-repellent layer 15 as described above, in the case of using the fiber assembly shown in Fig. 2A, it is preferable to use the average of the low-density fiber assembly of the upper layer 52 constituting the gas-liquid contact portion 5. As the fiber assembly having a high fiber density, for example, a high-density fiber assembly constituting the intermediate layer 53 is preferably used. The water retaining layer 15 is in a water retaining state only because of the minute water droplets sprayed upward, so that the water seal state is not formed and the pressure loss is not increased. Therefore, in order to efficiently remove the fine particles and the gas phase material by the water film formed on the bottom surface of the water retaining layer 15, it is preferable to use a high-density fiber aggregate.

Next, the present invention will be described in more detail by way of specific examples.

(Example 1)

In the present embodiment, the removal rate of fine particles and SO ₂ in the air was measured using the air purifying apparatus shown in Fig. 1 . A single-layer fiber assembly is used as the gas-liquid contact portion, and a Saran Lock having a fiber having a fineness of 600 to 1000 denier, a thickness of 50 mm, and a surface area (specific surface area) of 410 m ² /m ³ of the fiber per unit volume is used (product number: OM-150) is a fiber assembly with a flat surface as the top surface. Further, Saran Lock (commodity number: CS-120) having a fiber denier 70 denier, a thickness of 20 mm, and a specific surface area of 890 m ² /m ³ was used as a water-repellent layer, and a flat surface was used as a top surface.

The treatment flux of the treated air flowing into the gas-liquid contact portion was 150 m ³ /h, and the spray flow rate of the washing water sprayed from the spray nozzle was 3 L/min. In this case, the ratio of the spray flow to the treatment flux is 1.0.

The microparticle removal rate is calculated from the particle concentration of the air to be treated and the particle concentration of the purified air by a particle counter provided on the upstream side of the intake port and the downstream side of the exhaust port. The inlet load at this time is the 11th type 1 mg/m ³ of the test powder 1 of the Japan Industrial Standards Survey (JIS) Z 8901. Moreover, the particle removal rate was measured for the particle diameter of each target fine particle. In the same manner, SO ₂ removal, by the Department of the upstream side are provided on the downstream side of the intake port and the exhaust port of the SO ₂ concentration meter, and the air to be treated from the SO ₂ concentration of SO ₂ in the air cleaner The concentration is calculated. The inlet load at this time was 0.1 mg/m ³ . Further, the pressure difference is measured by a differential pressure meter to measure the pressure difference between the upstream side of the intake port and the downstream side of the gas-liquid contact portion (between the water retaining layer and the blower).

(Example 2)

The fiber assembly (Saran Lock (product number: OM-150)) of Example 1 was stacked on the flat surface as a top surface, and the laminate formed thereby was used as a gas-liquid contact portion, in addition to The measurement was carried out under the same conditions as in Example 1.

(Example 3)

A single-layer fiber assembly was used as the gas-liquid contact portion, and a fiber denier 70 denier, a thickness of 20 mm, and a specific surface area of 890 m ² /m ³ Saran Lock (commodity number: CS-120) was used as a fiber assembly, and was flat. The measurement was carried out under the same conditions as in Example 1 except that the surface was the top surface.

(Example 4)

The fiber assembly (Saran Lock (commodity number: CS-120)) of Example 3 was stacked on the flat surface as a top surface, and the laminate formed thereby was used as a gas-liquid contact portion, in addition to The measurement was carried out under the same conditions as in Example 1.

(Example 5)

A laminate comprising the laminate shown in FIG. 2B, that is, an intermediate layer composed of an upper layer and a high-density fiber assembly composed of a low-density fiber assembly, and a lower layer composed of a low-density fiber assembly. The measurement was carried out under the same conditions as in Example 1 except that the gas was used as the gas-liquid contact portion. Using the fiber assembly (Saran Lock (product number: OM-150)) of Example 1 as a low-density fiber assembly, the fiber assembly of Example 3 (Saran Lock (commodity number: CS-120)) was used as the high density. Fiber aggregates. The layered body is such that each fiber assembly is topped with a flat surface Stacked in a face-to-face manner with a thickness of 120mm.

(Example 6)

The other fiber assembly was further provided as a gas-liquid contact portion under the fiber assembly of the lowermost layer of the laminate of Example 5, and measurement was carried out under the same conditions as in Example 5. The additional fiber assembly was the same high-density fiber assembly (Saran Lock (product number: CS-120)) as the intermediate layer of Example 5. Therefore, the gas-liquid contact portion of the sixth embodiment is composed of a four-layer fiber assembly, and the lowermost layer is a high-density fiber assembly, which is different from the gas-liquid contact portion of the fifth embodiment.

(Comparative Example 1)

Except that the fiber assembly of Example 1 (Saran Lock (commodity code: OM-150)) was placed upside down as a gas-liquid contact portion, that is, the flat surface was a bottom surface, and the uneven and rough surface was The measurement was carried out under the same conditions as in Example 1 except that the top surface was provided.

(Comparative Example 2)

The measurement was carried out under the same conditions as in Example 2 except that the laminate of Example 2 was placed upside down as a gas-liquid contact portion.

(Comparative Example 3)

The measurement was carried out under the same conditions as in Example 3 except that the fiber assembly (Saran Lock (product number: CS-120)) of Example 3 was placed upside down as a gas-liquid contact portion.

(Comparative Example 4)

The measurement was carried out under the same conditions as in Example 4 except that the laminate of Example 4 was placed upside down as a gas-liquid contact portion.

Table 1 shows the fine particle removal ratio, the SO ₂ removal rate, and the pressure difference in Examples 1 to 4 and Comparative Examples 1 to 4.

In Examples 1 to 4, it was confirmed that good results were obtained with respect to the fine particle removal rate, the SO ₂ removal rate, and the pressure difference of the particle diameter of less than 5.0 μm as compared with the corresponding Comparative Examples 1 to 4. This is considered to be because, in Comparative Examples 1 to 4, the fiber assembly system was turned upside down as compared with Examples 1 to 4, and the flat bottom surface could not promote drainage and formed a state of excessive water retention.

Next, Table 2 shows the fine particle removal rate, the SO ₂ removal rate, and the pressure difference in Example 3, Example 5, and Example 6.

It was confirmed that in Example 5, compared with Example 3, the particle removal rate, the SO ₂ removal rate, and the pressure difference of the particle diameter of less than 5.0 μm were greatly improved, in particular, the pressure difference was reduced by about 90% or more. In the gas-liquid contact portion of the fifth embodiment, the intermediate layer of the laminate corresponds to the fiber assembly (high-density fiber assembly) of the third embodiment, that is, the upper and lower fibers having the high-density fiber assembly are sandwiched by the low-density fiber assembly. Composition. Therefore, in Example 5, even if the thickness of the gas-liquid contact portion is thick (Example 3: 20 mm, Example 5: 120 mm), good results (particularly, pressure difference) can be obtained, which is considered to be such a laminate. The effect of the construction.

On the other hand, in the gas-liquid contact portion of the fifth embodiment, a high-density fiber assembly having excellent fine particle removal performance is added, and in the portion of the fine particle removal rate, it is better than the fifth embodiment. As a result, it was also found that the pressure difference increased significantly. This is considered to be because in the sixth embodiment, the lowermost layer of the laminate is a high-density fiber assembly, and the bottom surface is more in a water-retaining state, resulting in a water seal. Therefore, in the case of comparing Example 5 with Example 6, Example 5 is preferable from the viewpoint of the pressure difference.

1‧‧‧Air purification unit

2‧‧‧ frame

3‧‧‧ suction port

4‧‧‧Exhaust port

5‧‧‧ gas-liquid contact

6‧‧‧ spray nozzle

7‧‧‧Circular trough

8‧‧‧Circulating pump

9, 13, 14‧‧‧ piping

10‧‧‧External water source

11‧‧‧Water supply valve

12‧‧‧Drain valve

15‧‧‧Water retaining layer

16‧‧‧Air blower

Claims (7)

An air purifying device, comprising: an air inlet and an air outlet, an air inlet and an air outlet disposed in the frame, the air outlet being located above the air inlet; and the gas-liquid contact portion Between the intake port and the exhaust port, the air introduced into the frame from the intake port is in contact with the washing water; and the spraying means is disposed above the gas-liquid contact portion, and the gas-liquid contact portion is provided Spraying the washing water; storing the washing water; storing the washing water; and washing the water circulation means, and supplying the washing water stored in the washing water storage means to the spraying means to clean the washing water a water circulation; the gas-liquid contact portion has a fiber assembly, and is a felt-like fiber assembly having different fiber densities in a thickness direction, and one side of the fiber assembly has a low density and has an undulating shape, and the other side of the fiber assembly The fiber assembly is high in density and has a flat shape; the fiber assembly is disposed between the suction port and the exhaust port, the one surface being located on the suction port side, and the other surface being located on the exhaust port side. The air-purifying device according to claim 1, wherein the gas-liquid contact portion has a plurality of layers of the fiber aggregate having different average fiber densities, and a laminate of three or more layers is stacked, and the lowermost layer of the laminate is Among the plurality of fiber assemblies, the fiber assembly having the lowest average fiber density is composed. An air purifying apparatus according to claim 2, wherein the uppermost layer of the laminated body is composed of the same fiber aggregate as the lowermost layer. The air purifying apparatus according to claim 3, wherein the laminated system is composed of an upper layer formed by the fiber aggregate having a relatively low average fiber density and a fiber aggregate having a relatively high average fiber density. The intermediate layer formed and the lower layer formed by the fiber assembly having a relatively low average fiber density. The air purifying device according to any one of claims 1 to 4, further comprising: an exhausting means for introducing air from the air inlet and discharging the air from the exhaust port; Introducing air from the suction port: the flow rate of air passing through the top surface of the gas-liquid contact portion is larger than the water having the smallest diameter among the water droplets sprayed on the gas-liquid contact portion Drop the speed of free fall. The air purifying device of claim 5, further comprising: an anti-drip plate disposed above the spraying means to prevent the misty water sprayed from the spraying means from scattering; the anti-drip plate is disposed from the The position where the water sprayed by the spraying means cannot directly contact, and is the position where the spray water which is sprayed upward from the top surface of the gas-liquid contact portion by the air introduced from the air inlet is reached. The air purifying device according to any one of claims 1 to 4, wherein the spraying means sprays the washing water to the gas-liquid contact portion so that the washing water spray flow rate to the gas-liquid contact portion is relatively The ratio of the air flux passing through the gas-liquid contact portion is in the range of 0.5 to 3.0.