JP2002035094A - Air volatile organic compound / formaldehyde removal equipment - Google Patents

Abstract

(57) [Problem] To quickly and sufficiently lower the concentrations of VOC and formaldehyde in a room. SOLUTION: An adsorbing member 2 adsorbs VOC and formaldehyde in a direction of an air flow generated by a fan 1.
And a decomposition member 3 for decomposing VOC and formaldehyde.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel apparatus for generating an air flow in a room and removing volatile organic compounds (hereinafter abbreviated as VOC) and formaldehyde contained in the air flow.

[0002]

2. Description of the Related Art Conventionally, an air purifier has been proposed and actually provided as a device for purifying indoor air.

Various types of air purifiers have been proposed, but an adsorbing member for adsorbing living odor substances such as ammonia, acetaldehyde, acetic acid, methyl mercaptan, and trimethylamine, and decomposing them. A configuration including a decomposition catalyst has also been proposed.

Therefore, if the above-described air purifier including the adsorbing member and the decomposition catalyst is installed in a room and the air purifying operation is performed, living odor substances are removed by adsorption and decomposition, thereby purifying the indoor air. Seems to be able to.

[0005]

In order to purify indoor air using the above-mentioned air purifier including an adsorbing member for adsorbing a living odor substance and a decomposition catalyst for decomposing the same, it is difficult to clean the living room. Although sufficient removal of odorous substances can be achieved, there is an inconvenience that sufficient removal of VOC and formaldehyde cannot be achieved only by decomposition using a decomposition catalyst.

A further description will be given.

[0007] Since VOCs and formaldehyde generated from wall materials and floor materials in newly constructed houses in recent years have a mechanism of sustained release in a stationary state, they have been used for a long period of several years after construction. VOC and formaldehyde are gradually generated. Since a newly built house in recent years has high airtightness, the concentration of VOC and formaldehyde in the room is gradually increased as it is, and the safety level (0.08
ppm), which in turn may hinder the occupants' health.

More specifically, the VOC and formaldehyde concentrations are actually measured in a newly built house immediately after completion, and the VO in the room after operating an air purifier provided with only a photocatalyst is measured.
C, FIG. 3 shows the results of measuring the change in formaldehyde concentration.
The result shown in FIG. As can be seen from these results, the VOC and formaldehyde concentrations in the room increased after the operation of the air purifier, and no attenuation tendency was observed within the test time.

In order to investigate the cause, a volume of 13.9 has been set.
m ³ , floor area 7m ² , interior SUS test room is sufficiently ventilated, formaldehyde concentration is stabilized and the formula concentration is measured. Then, ^two 1.6m ² particle boards are placed on the floor in the center of the room. After installation and standing for 2 hours, only the blower is operated to continuously measure the concentration thereafter (Experiment 1).
In addition, a 13.9 m ³ capacity, a floor area of 7 m ² , and sufficient ventilation in the interior SUS test room to stabilize the formaldehyde concentration, measure the formula concentration, and then install six 1.6 m ² particle boards. (Two were placed on the floor in the center of the room and four were placed against the wall), and at the same time as the installation, an air purifier (air volume: 3 m ³ / min, floor was placed at the center of the wall in front of the entrance of the test room) It is closed by operating (installed in a standing state), and the subsequent concentration is continuously measured (Experiment 2).

However, as a measuring method, DNPH-HPL
Method C: Adopted a height of 1.2 m above the floor, collected 1 liter per minute for 30 minutes with a DNPH cartridge for a total of 30 liters, extracted the DNPH cartridge with acetone, and then HPL
Separation and quantification were performed using a C liquid chromatograph.

As a result, the density change characteristic shown in FIG. 4 was obtained by performing Experiment 1, and the density change characteristic shown in FIG. 5 was obtained by performing Experiment 2.

From the actual measurement results shown in FIGS. 4 and 5, it can be seen that the same phenomenon as in the field test was reproduced together with the air blowing operation (the indoor formaldehyde concentration increased). And these are because the form of air causes the floating formaldehyde near the surface of the building material to be radiated into the room for a certain period of time, so that the amount of radiation increases, and then the building material becomes in a steady state of diffusion due to internal diffusion of the building material. It can be inferred.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-mentioned problems.
C, It aims at providing a formaldehyde removal device.

[0014]

An aerial VOC according to claim 1,
The formaldehyde removal device includes an adsorbing member for adsorbing VOC / formaldehyde and a decomposition member including a decomposition catalyst for decomposing VOC / formaldehyde.

According to a second aspect of the present invention, in the air VOC / formaldehyde removing apparatus, the adsorbing member has a processing air volume of 4 m ^3.
/ Min at a rate of 76% or more.
A material having a decomposition performance of 10% or more in a state of ³ / min is adopted.

According to a third aspect of the present invention, there is provided an air VOC / formaldehyde removing apparatus, wherein the adsorbing member contains activated carbon, and the decomposition catalyst is a photocatalyst.

According to a fourth aspect of the present invention, there is provided an air VOC / formaldehyde removing apparatus in which the adsorbing member and the disassembling member are integrated with each other.

[0018]

In the air VOC / formaldehyde removing device according to the first aspect, an air flow is generated in the room, and in removing the VOC / formaldehyde contained in the air flow, the VOC / formaldehyde is adsorbed by the adsorbing member, VOC / formaldehyde can be decomposed by the decomposition catalyst contained in the decomposition member.

Therefore, it is possible to adapt to the generation characteristic that the diffusion speed of VOC / formaldehyde generated at the beginning of the generation of the air flow temporarily increases, and thereafter equilibrates to a steady diffusion state. From the beginning, a sufficient effect of removing VOC / formaldehyde can be achieved.

[0020] In the air VOC / formaldehyde removing apparatus according to claim 2, the adsorbing member has an adsorbing performance of 76% or more when the processing air amount is 4 m ³ / min. Since the air having a decomposition performance of 10% or more when the processing air amount is 4 m ³ / min is adopted, the air flow is mainly dealt with by the adsorption member at the beginning of the air flow, and the steady diffusion state is obtained. This can be mainly dealt with by the disassembly member, so that the same operation as in claim 1 can be achieved.

According to the third aspect of the present invention, in the air VOC / formaldehyde removal apparatus, the adsorbing member includes activated carbon and the decomposition catalyst employs a photocatalyst. A similar effect can be achieved.

In the air-borne VOC / formaldehyde removing apparatus according to the fourth aspect, since the adsorbing member and the disassembling member are integrated with each other, the VOC / formaldehyde adsorbed on the adsorbing member is decomposed to extend the life. In addition to the above, the same operation as any one of claims 1 to 3 can be achieved.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for removing VOC and formaldehyde in the air according to the present invention.

FIG. 1 is a schematic view showing an embodiment of the air VOC / formaldehyde removing apparatus according to the present invention.

The apparatus for removing VOC / formaldehyde in the air comprises a fan 1 for generating an air flow, and an adsorbing member 2 sequentially arranged in the direction of the air flow generated by the fan 1.
And a disassembly member 3. Preferably, the adsorbing member 2 and the decomposing member 3 are arranged close to each other so that the VOC / formaldehyde adsorbed by the adsorbing member 2 can be decomposed by the decomposing member 3 to some extent.

The adsorbing member 2 accommodates an adsorbent such as fibrous activated carbon or granular activated carbon in a case having a predetermined shape, and sets the shape of the case to a shape that allows a predetermined amount of air to flow therethrough. ing. Here, fibrous activated carbon is suitable for improving the transient efficiency, and granular activated carbon is suitable for improving the adsorption amount.

The decomposition member 3 is provided with a large number of cylindrical portions so as to form a large number of ventilation paths, and a decomposition catalyst is disposed on the inner surface of each cylindrical portion. As this decomposition catalyst,
For example, a photocatalyst can be employed. In this case, a light source for irradiating light to activate the photocatalyst is provided.

The operation of the air VOC / formaldehyde removal apparatus having the above-described structure is as follows.

If the fan 1 is rotated in order to reduce the concentration of VOC / formaldehyde in the room, an air flow is generated in the room, and as it is, the emission speed of VOC / formaldehyde from the wall material, floor material, etc. Increases more than 10 times the emission rate up to that point, and the concentration of VOC.formaldehyde increases remarkably. However, in this device, the air containing VOC / formaldehyde is guided to the adsorbing member 2, so that the VOC / formaldehyde whose emission amount has rapidly increased is effectively adsorbed, and the concentration of VOC / formaldehyde contained in the discharge air is reduced. It can be reduced sufficiently.

When a predetermined time has elapsed since the start of the rotation of the fan 1, the VOC / formaldehyde is in a steadily radiating state.
Decomposes formaldehyde and contains VOCs in the discharged air
・ The concentration of formaldehyde can be sufficiently reduced.

FIG. 2 is a diagram for explaining changes in the formaldehyde concentration in a room.

FIG. 2A shows the case where only the air is blown, and FIG.
The middle B shows the case where only the disassembly member functions, and the middle B shows the case where the suction member and the disassembly member function.

If the room is left closed for a predetermined period of time, formaldehyde is radiated from the wall material, floor material, etc., and the concentration of formaldehyde gradually increases.

Thereafter, if the fan 1 is rotated to generate an airflow in the room, if neither the adsorbing member 2 nor the disassembling member 3 is operated, the concentration of formaldehyde is increased due to a rapid increase in the emission speed. Rapidly increases, and then gradually decreases (see A in FIG. 2). When only the decomposition member 3 is operated, the decomposition of the formaldehyde is performed by the decomposition member 3, so that the concentration of formaldehyde is lower than that in the case of A in FIG. : D in FIG. 2).
It cannot be said that sufficient security has been ensured (see B in FIG. 2).

However, when the adsorbing member 2 and the decomposing member 3 are made to function, the concentration of formaldehyde decreases immediately after the generation of the air flow, as shown in FIG. Can be

In a room equivalent to 8 tatami immediately after the new construction, the number of times of ventilation by natural ventilation is set to 0.1 per hour,
The temperature in the closed state is 34 ° C and the relative humidity is 60%
As shown in Table 1, the equilibrium concentration of formaldehyde (ppb) and the emission rate of formaldehyde (mg / mg) are shown in Table 1 corresponding to the closed stationary state, the state after the formation of the airflow, and the steady state. h / m ² ), the ratio of each diffusion rate to the diffusion rate in the closed stationary state, WHO
The transient efficiency (%) required to clear the reference value (80 ppb) is obtained. In addition, the air volume of the processing device was 4 m ³
/ Min.

[0037]

[Table 1] As can be seen from Table 1, the state after the formation of the airflow (the state of free formaldehyde emission after the formation of the airflow) is dealt with by the adsorption member 2 having an air flow rate of 4 m ³ / min and having an adsorption performance of 76% or more, In a steady state (internal formaldehyde diffusion state), the air volume of the processing apparatus is 4 m ³ / min.
If the decomposition member 3 having a decomposition performance of 10% or more is used, the concentration of formaldehyde in the room can be promptly reduced after the airflow is formed, and the WHO reference value can be cleared.

Further, in the above embodiment, the adsorbing member 2 and the disassembling member 3 can be integrated with each other. In this case, the formaldehyde once adsorbed can be decomposed, and the life can be extended. Can be longer.

Although only formaldehyde has been described above, the concentration of VOC can also be reduced rapidly and significantly.

In the above embodiment, the air to be treated passes through the adsorbing member 2 and the disassembly member 3 in this order, but the air to be treated only passes through the adsorbing member 2 in accordance with the state after the airflow is formed. It is possible to configure so that the air to be processed passes only through the decomposition member 3 in accordance with the steady state. By employing such a configuration, the operating time of the suction member 2 can be reduced, and the life of the suction member 2 can be extended.

[0041]

According to the first aspect of the present invention, a sufficient effect of removing VOC and formaldehyde from the beginning of the generation of the air flow can be achieved.

According to the second aspect of the present invention, it is possible to cope mainly with the adsorbing member at the beginning of the generation of the air flow, and to cope with the steady diffusion state mainly with the disassembling member. Play.

The third aspect of the invention has the same effect as the first or second aspect.

According to the fourth aspect of the present invention, the life can be extended by decomposing the VOC / formaldehyde adsorbed on the adsorbing member, and the same effect as any one of the first to third aspects can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an air VOC / formaldehyde removing apparatus according to the present invention.

FIG. 2 is a diagram illustrating a change in a formaldehyde concentration in a room.

FIG. 3 is a diagram showing the results of actually measuring the VOC and formaldehyde concentrations in a newly built house immediately after completion, and measuring the changes in the VOC and formaldehyde concentrations in the room after operating an air purifier provided with only a photocatalyst. It is.

FIG. 4 is a diagram showing a result of continuously measuring the concentration after operating only the blower.

FIG. 5 is a diagram showing a result of operating an air purifier provided with only a photocatalyst, closing the air purifier, and continuously measuring the concentration thereafter.

[Explanation of symbols]

 2 Suction member 3 Disassembly member

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53/86 B01D 53/36 G ZAB ZABJ (72) Inventor Hiroshi Mine 1304 Kanaokacho, Sakai City, Osaka Daikin F-term in Industrial Co., Ltd. (reference) 4C080 AA05 AA09 BB02 BB04 CC02 HH05 JJ04 JJ05 KK08 LL02 MM05 MM40 NN01 QQ20 4D012 CA10 CB08 CD10 CE03 CF02 CF10 CG01 CG04 CG06 CH05 CK07 4D048 AA03 EA04

Claims (4)

[Claims] 1. An apparatus for generating an air flow in a room and removing volatile organic compounds and formaldehyde contained in the air flow, comprising: an adsorbing member (2) for adsorbing volatile organic compounds and formaldehyde; A decomposing member (3) including a decomposition catalyst for decomposing a volatile organic compound / formaldehyde. 2. The suction member (2) has a processing air amount of 4
The decomposing member (3) has an adsorption performance of 76% or more in a state of m ³ / min, and the decomposition member (3) has a decomposition performance of 10% or more in a state of a processing air amount of 4 m ³ / min. Item 3. An apparatus for removing volatile organic compounds and formaldehyde in the air according to Item 1. 3. The apparatus for removing volatile organic compounds and formaldehyde in air according to claim 1, wherein the adsorbing member (2) contains activated carbon, and the decomposition catalyst is a photocatalyst. 4. The apparatus for removing volatile organic compounds and formaldehyde in air according to claim 1, wherein the adsorption member (2) and the decomposition member (3) are integrated with each other.