JP4892696B2 - Indoor air purifier - Google Patents

Description

The present invention relates to formaldehyde, benzene in indoor air, which is considered to be a causative substance such as acetaldehyde contained in tobacco odor, sick house syndrome, and chemical sensitivity.
The present invention relates to an indoor air purification apparatus using an activated carbon fiber sheet for removing volatile organic compounds (VOC) such as toluene, ethylbenzene, and xylene.

Sick house syndrome, chemical sensitivity etc. are formaldehyde, benzene, toluene, ethylbenzene generated from building materials such as apartments, houses, buildings, paints, adhesives, etc.
VOC components such as xylene have been considered a major cause.

Recently, many researchers have conducted research on VOC removal treatment using a titanium oxide photocatalyst. In order to increase the amount of contaminated air, filters with titanium oxide applied have been developed, but since the contaminated air is fundamentally filtered with a filter, the amount of titanium oxide applied must be reduced to reduce ventilation resistance. Less is required. In addition, the time for passing through the filter is instantaneous, and the reaction time for oxidative decomposition of VOC is extremely short, and VOC is highly efficient.
It is not necessarily suitable for removing the.

In addition, as a problem of VOC removal treatment technology using a titanium oxide photocatalyst, for aromatic hydrocarbons having a benzene ring such as benzene, toluene, ethylbenzene, xylene,
The final oxidative decomposition reaction does not proceed to harmless water (H ₂ O) and carbon dioxide (CO ₂ ), and various intermediate products are produced. The intermediate products are adsorbed on the surface of the titanium oxide photocatalyst and photocatalytic action occurs. Suppress.

Furthermore, in the case of volatile organic chlorinated compounds such as methylene chloride containing chlorine atoms, 1,2-dichloroethane, chloroform, trichloroethylene, tetrachloroethylene, etc., a very harmful intermediate such as phosgene, chlorine gas, hydrogen chloride, although it is a trace amount. This is a problem because the product is produced.

Therefore, in the case of volatile organic chlorine compounds such as aromatic hydrocarbons having a benzene ring such as benzene, toluene, ethylbenzene and xylene, methylene chloride, 1,2-dichloroethane, chloroform, trichloroethylene and tetrachloroethylene, the titanium oxide photocatalyst is used. The VOC removal processing technique used is not necessarily suitable.

On the other hand, granular activated carbon is generally used to remove gaseous chemical components. In recent years, instead of granular activated carbon, an adsorbent using an activated carbon fiber sheet, which is fibrous activated carbon, has been developed and used in air purification filters and the like (Patent Documents 1 to 3).

The inventors of the present invention have developed activated carbon fibers based on activated carbon fibers that are particularly excellent in VOC removal performance (Patent Documents 4 to 7, Non-Patent Document 1).

Since the activated carbon fiber has a larger outer surface area and specific surface area than ordinary granular activated carbon, the contact efficiency with the gas component existing in the space is high, and when used as a filter, the adsorption rate can be increased.

Normally, these air purifiers use a filtration method in which polluted air flows in a direction perpendicular to the plane of the filter material and is forced to pass through the filter material to simultaneously adsorb harmful gas and gradually dust. This is a filtration method in which harmful gas is adsorbed by a gas adsorption filter after particles are captured by a dust filter. In order to increase the adsorption efficiency of harmful substances by the filtration method, it is necessary to make the filter finer, so that the ventilation resistance is increased and it is difficult to treat a large amount of air.

On the other hand, sheet-like filters are laminated in parallel (Patent Documents 8 and 9) or corrugated (Patent Documents 10 to 12) to contaminate the gap between the filter material in parallel with the plane of the filter material. Although there is a method to reduce the pressure loss of the air flow by flowing air, naturally the amount of air to be processed increases, and the adsorption efficiency of harmful substances deteriorates even if it is pleated or corrugated to increase the contact area . It is very difficult to increase the adsorption efficiency by this method, and as a device for increasing the adsorption efficiency, for example, an example (Patent Document 13) in which a passage in the depth direction including a gap is zigzag is known. Degree.

JP-A-6-339629 Japanese Patent Laid-Open No. 7-251004 Japanese Patent Application Laid-Open No. 2004-526928 JP 2002-159852 A JP 2002-219163 A JP 2003-053116 A JP 2004-277926 A Japanese Utility Model Publication 5-85416 Japanese Patent Laid-Open No. 11-207140 Japanese Patent Laid-Open No. 5-78996 JP 2001-120648 A JP 2003-62413 A JP 2004-298316 A Asami Shinichi et al., Industrial Materials, Vol. 49, No. 1, p. 77-80, (January 2001)

Due to the increasing social interest in indoor air pollution, many air purification technologies have been studied. There is an increasing demand for adding a VOC removal effect to an air cleaner. However, compared to the importance of the problem, many of these technologies are simply diversions of existing filter methods and filtration methods using activated carbon and other adsorbents, etc. There are many things that must be questioned. Activated carbon fine particles and activated carbon fibers are typical as toxic gas adsorbents, but toxic gases cannot be removed sufficiently by themselves, so it is necessary to devise methods such as attaching chemicals and using other removal means in combination. .

Recently, indoor air purification technology using a titanium oxide photocatalyst has also been developed. However, because it is a batch-type air treatment technology in a reaction tank, the air treatment volume is as low as several liters per minute, and a large amount of air treatment is achieved. Is a problem.

In addition, when VOC such as benzene, toluene, ethylbenzene, xylene is removed with a titanium oxide photocatalyst, it is difficult to completely oxidize and decompose to carbon dioxide or water. Adsorbs to the titanium oxide photocatalyst and decreases its ability.

Furthermore, the filtration indoor air purification device using a conventional filter increases the adsorption efficiency by the adsorbent, so that the foreign particles contained in the air adhere to the adsorbent and the deterioration of its function is accelerated. Even when fibers are used, frequent replacement and regeneration of the filter is required. In addition, since the amount of adsorption is limited, when the amount of adsorption is saturated, the adsorbed component is desorbed and re-released by the aeration force. In addition, it is desirable that the indoor air purification device used in daily life is as low as possible, and it is necessary to reduce the pressure loss of the filter and reduce the noise of the fan for air circulation. Contradict that.

Therefore, it is not an extension of the conventional technology, and even small devices can efficiently and completely remove harmful gas components such as VOC, and can process a large amount of air and reduce the function of adsorbents. Development of efficient air purification technology is necessary.

Conventionally, in order to exert the adsorption performance of a filter of an air cleaning device, a filtration method in which contaminated air is flowed in an orthogonal direction with respect to the plane of the filter has been a technical common sense. In order to reduce noise and vibration by reducing the output of the air blowing means, it has been considered that a method of laminating sheet-like filters in parallel and flowing contaminated air through the gap inevitably results in a decrease in adsorption performance.

An activated carbon fiber sheet has also been used exclusively as a filter of the above-described type in which air flows in the orthogonal direction. Usually, the adsorption power of the filter is the equilibrium concentration (pp) of the component to be removed in the air when the air containing the component to be removed is filtered in a direction orthogonal to the plane of the filter.
m) and the equilibrium adsorption amount (mg / g) in the plane of the filter. In addition, the adsorption performance of the filter can be expressed by the adsorption capacity per unit area (mmol / m ² ) until the adsorption is saturated, and this value is used for a filter used for a long time such as an air purifier. Larger air treatment is desirable because it is possible to process a large amount of air before replacing the filter. However, when an activated carbon fiber sheet is used, for example, the benzene adsorption capacity is at most several tens mmol / m ² .

However, the present inventor uses the activated carbon fiber sheet as a diffusion scrubber type air passage constituting material, so that the adsorption capacity for volatile organic compounds (VOC) such as formaldehyde, benzene, toluene, ethylbenzene, and xylene in the air, It has been found that a unique and remarkable effect can be obtained that the number is several times or more than when used in a filtration system, and greatly exceeds the limit of the conventionally known adsorption capacity.

The reason why the adsorption capacity increases significantly in this way when using the non-filtration method by the diffusion scrubber compared to the case where the activated carbon fiber sheet is used in the filtration method is not clear, but in the case of the filtration method, Since air flows perpendicularly to the surface of the activated carbon fiber sheet, the gas component adsorbed on the surface of the activated carbon fiber sheet is desorbed by the action of the ventilation force when the ventilation resistance is increased, whereas in the case of a diffusion scrubber, activated carbon fiber is used. Since air flows in parallel to the sheet surface, there is no ventilation resistance, and it is thought that the main factors are that the gas components adsorbed on the activated carbon fiber sheet surface are less likely to be detached due to the action of the ventilation force.

That is, the present invention allows gas to flow through the gaps constituting the air passage and selectively removes the gas from the gas by using the difference in diffusion coefficient between the gas and particles contained in the gas to selectively adsorb the gas on the air passage surface. The present invention relates to an indoor air purification apparatus using an activated carbon fiber sheet , wherein the activated carbon fiber sheet is used as an air passage constituting material of a diffusion scrubber, and volatile organic compounds in the air are removed by the activated carbon fiber sheet in a non-filtration manner. .

In addition, the present invention provides the activated carbon fiber sheet characterized in that the ventilation passage is configured to obtain a harmful gas removal efficiency of 50% or more in one pass in a theoretical formula representing the principle of the diffusion scrubber of Gormley and Kennedy. The present invention relates to an indoor air purifying apparatus using the .
Furthermore, the present invention relates to an indoor air purifying apparatus using the activated carbon fiber sheet , characterized in that a plurality of ventilation path units are connected in series in the ventilation direction .

Air purification by the apparatus of the present invention is based on the principle of diffusion scrubber method, specific examples, as a parallel plate structure and to Luke corrugated structure composed of an array of a number to the parallel laminated activated carbon fiber sheet It is good to install in the ventilation path of an air purification apparatus by providing the clearance gap used as an ventilation path. In this case, when polluted air containing VOC is continuously flowed through a narrow gap in the ventilation path made of activated carbon fiber sheet, the gas and particles are separated from the surface of the filter by filtering the polluted air like a conventional filter. In contrast to being captured at the same time, only the VOC that has been separated by the difference in diffusion coefficient of gas and particles and diffused on the surface of the activated carbon fiber sheet without being filtered.
It is adsorbed on the surface of the activated carbon fiber sheet by a non-filtration method and removed from the air.

The indoor air purifying apparatus using the activated carbon fiber sheet of the present invention is (1) a VOC removal process can be efficiently performed by a non-filtering method using an air passage having a simple activated carbon fiber sheet surface, (2)
Contaminated air is allowed to flow through the narrow gap in the ventilation path with the activated carbon fiber sheet surface. Unlike conventional filtration methods, there is no ventilation resistance, and the amount of contaminated air can be increased. With high efficiency and high removal capacity, it has an epoch-making advantage in removing VOCs.

Activated carbon fiber is industrially produced from rayon fiber, acrylic fiber, phenol fiber, and pitch material. The activated carbon fiber manufactured by melt spinning using coal pitch as a raw material has, for example, a thickness of 11 to 18 μm, a specific surface area (m ² / g) of 700 to 2500, an outer surface area (m ² /
g) 0.2-0.7 and average pore diameter (nm) 1.7-2.1. The carbon content of the activated carbon fiber produced from the pitch-based raw material is about 93%, which is considerably higher than that of the other raw materials.

These activated carbon fibers can be processed into various shaped articles such as paper making with felt, cloth, pulp and the like by using ordinary fiber processing machines and techniques. For example, it can be formed into a dry sheet or dry felt using a card machine.

Activated carbon fiber is hydrophobic, so it has excellent adsorption properties for hydrophobic substances such as benzene, toluene, ethylbenzene, xylene, and organic chlorine compounds, but highly volatile hydrophilic properties such as ammonia, hydrogen sulfide, lower alcohol, and lower aldehyde. Gas adsorption capacity is not good. In order to compensate for these drawbacks, activated carbon fibers impregnated with chemicals reactive with these gases are also commercially available.

The type of the activated carbon fiber sheet used in the apparatus of the present invention is not particularly limited, but the present inventors have developed an activated carbon fiber having excellent VOC removal performance (Patent Documents 4 to 7, Non-Patent Documents above). The sheet made of Patent Document 1) has a particularly high adsorption performance and is useful.

This activated carbon fiber suitable for VOC removal has basic performance as shown in Table 1 below.

The pore diameter, specific surface area, and pore volume increase in the order of A-7, A-10, A-15, and A-20. Conversely, the fiber diameter is reduced. All have a structure with developed micropores (2 nm or less), and have better adsorption of low-molecular and low-concentration gases than pulverized coal and granular coal with mesopores (2 to 50 nm). There is a feature. Also, because it is fibrous, felt, sheet,
It can be processed into various shapes such as paper, honeycomb and corrugated. When an activated carbon fiber sheet suitable for removing lower aldehydes is used as a filter, the acetaldehyde adsorption characteristic is that the equilibrium adsorption amount at 1 ppm is about 40 mg / g.

This activated carbon fiber-based air purification sheet is formed from building materials, paints, adhesives, etc. that are laid on the floors of condominiums and houses after construction, or hung on walls. Formaldehyde, benzene, toluene, ethylbenzene VOC components such as xylene can be removed. Moreover, it can be easily processed into a pleated or corrugated shape and used as a filter for various air purifiers.

The present invention is characterized in that an activated carbon fiber sheet is used as a diffusion scrubber type air passage constituting material. The principle of the diffusion scrubber method adopted in the present invention is a gas collection / removal method using diffusion, and the fact that the diffusion coefficient of gas and particles contained in the gas is greatly different,
In this method, gas is selectively removed from the gas by utilizing a diffusion phenomenon. Therefore, the principle of the diffusion scrubber referred to in this specification is different from the so-called wet diffusion scrubber method in which a gas is diffused into a solution such as water.

The principle of such a diffusion scrubber has been conventionally used as a means for analyzing trace gas components in the atmosphere, but the present inventors have previously described conventional gas removal methods such as chemical filters and activated carbon. Has developed an air purifying apparatus using a diffusion scrubber method as an innovative air pollutant removal technology having a different idea (Japanese Patent No. 3484208, Japanese Patent Application No. 2003-37105).
7).

When contaminated air is allowed to flow through the tube, gas components having a large diffusion coefficient diffuse to the inner wall surface of the tube and are collected by the wall surface. On the other hand, the particles in the contaminated air go straight because the diffusion coefficient is small, and are not collected on the tube wall surface.
A diffusion scrubber method is a method for separating and adsorbing trace gas components in a gas utilizing such a phenomenon. The diffusion scrubber can be realized not only by one cylindrical tube but also by multiple tubes such as a double tube and a triple tube. Moreover, the parallel plates arranged in multiple layers correspond to a multiple tube having an infinite diameter.
In addition, a polygonal shape such as a triangular cross section can be used as a deformation of the cylindrical tube. FIG. 1 shows the principle of the diffusion scrubber method when a parallel plate (shown as “plate” in FIGS. 1 and 1) is used.

As shown in FIG. 1, the width of the plate is b, the length of the plate is L, and the distance between adjacent plates is a.
When contaminated air is allowed to flow in the air flow direction shown in FIG. 1 through the gap between the two parallel plates, gas having a large diffusion coefficient diffuses to the wall surface of the parallel plate. The gas that has reached the inner wall surface is adsorbed on the wall surface. On the other hand, particles having a small diffusion coefficient pass through the parallel plate without diffusing to the wall surface. The theoretical removal efficiency of this parallel plate diffusion scrubber method is Gormley and Kennedy (Gormley P., Kennedy M .:
Proc. R. Ir. Acad., 45, equation 59-63 (1938) following removal efficiency based on the theoretical formula) (f) (
1) Calculated by equation (2) for removal parameter (μ) . Diffusion constant of each VOC (D
) Is benzene: 0.0828cm ² / s, toluene: 0.0792cm ² / s, p- xylene is 0.075 cm ² / s.

When activated carbon fiber sheets capable of adsorbing and removing VOCs are arranged as parallel plates and contaminated air is passed through the gaps between the activated carbon fiber sheets, VOCs having a large diffusion coefficient diffuse to the inner surface of the activated carbon fiber sheet. The VOC that reaches the surface is adsorbed on the surface and removed from the air.

Moreover, the calculation formula of the removal efficiency of the corrugated diffusion scrubber based on the Gormley and Kennedy theoretical formulas can be expressed by the following formulas (3), (4), and (5). Since the corrugated cross section is triangular rather than circular, the Gormley and Kennedy theoretical formulas for determining the removal efficiency of a tubular diffusion scrubber (
Gormley P., Kennedy M.:Proc. R. Ir . Acad., 52A, removal effect based on 163-169 (1949))
A parameter using the concept of equivalent diameter (δ) derived by Possanzin et al.
Substituting Ta (mu) of the formula (4) and (5) (Atmos.Environ.Vol.17,2605-2610 (1983) ) by seeking removal of parameter (mu), calculated.

The indoor air purification apparatus using the activated carbon fiber sheet of the present invention has a structure that can obtain a harmful gas removal efficiency of 50% or more in one pass in the theoretical formula representing the principle of the diffusion scrubber of Gormley and Kennedy. Since the removal efficiency of VOC in the air is 50% or more by flowing air once, it is sufficient for practical use. Therefore, the gap interval of the parallel plate structure or the triangle size of the corrugated structure is Based on the equation derived from Gormley and Kennedy, it should be designed to satisfy 50% removal efficiency.

In this way, unlike the conventional filtration method in which contaminated air is passed through the fine pores of the filter and adsorbs and removes VOC, the diffusion scrubber method simply contaminates the gap in the air passage having the gas adsorption surface. Ventilation resistance is very small because it is a non-filtering system that only allows air to flow.
C can be removed and processed with small energy.

In FIG. 2, an example of the indoor air purification apparatus which uses the activated carbon fiber sheet of this invention is shown. (
(A) is a side view which shows the relationship between the activated carbon fiber sheet 1 and the spacer 2, and (B) is a top view. The activated carbon fiber sheet 1 is held at a predetermined interval by a spacer 2 to form a gap.
As shown in the perspective view of c), a large number of activated carbon fiber sheets 1 are arranged in parallel to form an air passage, which is housed in a rectangular parallelepiped housing (not shown) to form a scrubber unit 3. The basic unit of the parallel plate structure has a ventilation sectional area S = a × b, a gap a, a width b, and an effective length L of ventilation.
As shown in the figure, when contaminated air is flowed from the lower side to the scrubber unit 3, clean air is discharged from the upper side.

FIG. 3 shows another example of the indoor air purification apparatus using the activated carbon fiber sheet of the present invention. In this method, a corrugated structure made of activated carbon fiber sheet 1 is held in a rectangular parallelepiped housing (not shown) and used as a scrubber unit 3. As shown in the enlarged right view, the basic unit of the corrugated structure has a triangular ventilation cross-sectional area S = a × b × corresponding to the gap of the parallel plate structure.
1/2, height a, base b, triangle perimeter l, and ventilation effective length L. As shown in the figure, when contaminated air is flowed from the lower side to the scrubber unit 3, clean air is discharged from the upper side.

If these airflow path units are arranged in series in a plurality of stages in the airflow direction, a turbulent flow effect is added to the multi-layered portion, and the VOC adsorption effect is enhanced. A rectangular parallelepiped when stacking multiple units
With be arranged within the housing staggered with respect to the ventilation direction center axis of the housing by 90 degrees, further increases the turbulence effect, can greatly enhance the adsorption effect.

For example, as shown in the side view (A) and the top view (B) of FIG. 4, the scrubber unit is mounted as the scrubber unit 3 in the air cleaning device 10 and blower means 11 such as a fan.
The outside air is taken in from the air intake port and is passed through the scrubber unit 3 to adsorb the VOC to the activated carbon fiber sheet. The particles passing through the scrubber unit 3 are
It is removed with a dust filter 12 arranged at the rear stage of the scrubber unit 3. When there are many particles or the like, the dust filter 12 may be disposed before and after the scrubber unit 3.

As an activated carbon fiber sheet, a sheet having a width (b) = 19 cm and a length (L) = 11.5 cm (HPC-C060 manufactured by Unitika; equivalent to activated carbon fiber A-15 in Table 1, weight per unit area 80 g / m ² , The content was 75%). As shown in FIG. 2, a large number of plastic spacers and activated carbon fiber sheets were alternately arranged in layers to form a parallel plate structure. 233 spacers were inserted into 234 activated carbon fiber sheets, and the interval (a) was set to 0.12 cm. This was accommodated in a rectangular housing having an internal dimension of 39 cm (length) × 19 cm (width) × 12 cm (height) to form a scrubber unit, and two scrubber units were used for the experiment. Since a plastic spacer is inserted between the sheets in order to secure a gap between the activated carbon fiber sheets, the effective surface of the activated carbon fiber sheet capable of adsorbing VOC is as follows: width (b) = 17 cm, length (L) = 10.5 cm. Become. Therefore, the ventilation cross-sectional area (S) of a pair of activated carbon fiber sheets is
2.04Cm ² becomes, since the single scrubber unit has 233 pieces of the gap, the total vent area at two scrubber unit becomes 951cm ^2. By sandwiching the activated carbon fiber sheet with the spacer, the activated carbon fiber sheet is loosely fixed, the play portion causes turbulence, and the adsorption effect can be further enhanced.

This scrubber unit is installed in the experimental device, and the ventilation flow rate is 50 m ³ / h, 100 m ³ / h.
, 200 m ³ / h, generating VOC mixed with benzene, toluene and p-xylene.
The scrubber unit was evaluated for VOC removal performance evaluation. The removal efficiency (%) was calculated from equation (6) by measuring each VOC concentration by GC-MS at the inlet and outlet of the scrubber unit. The results are shown in Table 2. The value in parentheses under the removal efficiency is the average value (ppmv) of the inlet concentration of each VOC. Table 2 shows that high removal efficiency was obtained for benzene, toluene, and p-xylene.
f (%) = (C1-C2) × 100 / C1 (6)
f; removal efficiency (%), C1; inlet concentration of each VOC (ppmv), C2; outlet concentration of each VOC (ppm)
v)

As shown in FIG. 3, as the activated carbon fiber sheet, a triangle (base: 0.31 cm, height;
Corrugated structure having 15,652 holes of 23 cm, cross-sectional area (S): 0.0357 cm ² ), total cross-sectional area of 558 cm ² , and height (effective ventilation length (L)) of 10 cm Body (Unitika FMC-B550-CC; equivalent to activated carbon fiber A-15 in Table 1, weight per unit area 80
g / m ² , and the activated carbon content is 75%). Inside dimensions: 48cm (length) x 19
The scrubber unit was housed in a rectangular housing of cm (width) × 10 cm (height). This scrubber unit is installed in an experimental device, and the ventilation flow rate is 100 m ³ / h, 200
A performance evaluation experiment was performed under the same conditions as in Example 1 as m ³ / h. The removal efficiency of each VOC was also calculated in the same manner as in Example 1. The results are shown in Table 3. The value in parentheses below the removal efficiency is the V
It is the average value (ppmV) of the inlet concentration of OC. Table 3 shows that high removal efficiency was obtained for benzene, toluene, and p-xylene.

Using a parallel plate type diffusion scrubber in which a pair of activated carbon fiber sheets (width 10 cm, length 5 cm, VOC adsorption surface area 100 cm ² ) as in Example 1 was set to a gap of 0.38 cm, the air flow rate was 14.4 cm. / S, V in which benzene, toluene, and p-xylene are mixed continuously
Air containing OC was flowed. The inlet concentrations of benzene, toluene, and p-xylene to the scrubber unit are 142.6 ± 9.6 ppm (n = 7) and 190.0 ± 8.9 pp, respectively.
m (n = 7), 172.0 ± 19.3 ppm (n = 8). The inlet concentration and the outlet concentration were measured over time until the concentration difference became zero. The experimental results are shown in FIG.
(Comparative Example 1)

Using the same activated carbon fiber sheet as in Example 1, an experiment was conducted by a conventionally used filtration collection method. The ventilation flow rate was 14.4 cm / s, and the filtration surface area of the activated carbon fiber sheet was 3 cmφ (7.07 cm ² ). V in which benzene, toluene and p-xylene are mixed
Air containing a relatively low concentration of OC was flowed. The inlet concentrations of benzene, toluene, and p-xylene to the scrubber unit were 6.47 ± 0.26 ppm (n = 6), 6.2, respectively.
They were 3 ± 0.32 ppm (n = 6) and 14.08 ± 2.58 ppm (n = 4). The inlet concentration and the outlet concentration were measured over time until the concentration difference became zero.
(Comparative Example 2)

The inlet concentrations of benzene, toluene, and p-xylene were 96.0 ± 3.94 ppm (n
= 10), 130.0 ± 7.07 ppm (n = 9), 161.8 ± 4.94 ppm (n =
9) The experiment was conducted by the filtration and collection method under the same conditions as in Comparative Example 1 except that the concentration was high. The inlet concentration and the outlet concentration were measured over time until the concentration difference became zero. The experimental results are shown in FIG.

Activated carbon fiber sheet 1 calculated based on the experimental results of Example 3 and Comparative Examples 1 and 2 above.
Table 4 shows a comparison result of the single VOC adsorption capacity per m ² . As can be seen from this result, it was found that when used in a parallel plate type diffusion scrubber system, the adsorption capacity was several times or more that of filtration collection.

This onset Ming, extremely is intended to provide a simple high-performance VOC removal processing technology having the energy conservation and economic rationality by the device, clean room-related semiconductor manufacturing, etc., garbage, odor, toilet-related, hospitals and Related to elderly, animal husbandry, public facilities such as stations, theaters, restaurants, museums, museums, experimental laboratories, trains and buses, dry cleaning, indoor air cleaning devices in various fields your stomach in, have a high adsorption efficiency, it is possible to filter the use of do not require replacement or regeneration for a long period of time.

It is a schematic explanatory drawing which shows the principle of a diffusion scrubber method. The side view (a) which shows the relationship between the parallel plate of the parallel plate structure which shows an example of the indoor air purification apparatus using the activated carbon fiber sheet of this invention, and a spacer, a top view (b), The schematic perspective view which shows a multilayer structure (C). It is the schematic perspective view and partial enlarged view of the corrugated type structure which show another example of the indoor air purification apparatus using the activated carbon fiber sheet of this invention. It is a schematic diagram which shows embodiment which set said scrubber unit to the indoor air purification apparatus. It is a graph which shows the measurement result for every time progress of the inlet_port | entrance density | concentration of the scrubber unit of benzene, toluene, and p-xylene in Example 3, and an outlet density | concentration. It is a graph which shows the measurement result for every time progress of the inlet_port | entrance density | concentration and outlet density | concentration of the scrubber unit of benzene, toluene, and p-xylene in the comparative example 2.

Claims (4)

In an indoor air purifying apparatus comprising a blowing means for taking air from an air inlet and a ventilation path having a gas adsorption surface,
The ventilation path is a parallel plate structure in which a large number of activated carbon fiber sheets are arranged in parallel,
The clearance between the parallel plate structures is determined by the removal efficiency based on the following Gormley and Kennedy theoretical formula (
Designed so that f is 50 or more in formula (1 ) of f) and formula (2) of removal parameter (μ) (however, the plate means a parallel plate) and stored in a rectangular parallelepiped housing. By

Only the volatile organic compounds contained in the indoor air and the volatile organic compounds separated by the difference in the diffusion coefficient of the particles and diffusing on the surface of the activated carbon fiber sheet are adsorbed on the surface of the air passage by a non-filtering method. It consists of a scrubber unit that is designed to be removed,
An indoor air purification apparatus comprising a dust removal filter for removing particles separated from volatile organic compounds at a subsequent stage of the air passage. The indoor air purification apparatus according to claim 1, wherein the activated carbon fiber sheet is held by a spacer to form a gap. In an indoor air purifying apparatus comprising a blowing means for taking air from an air inlet and a ventilation path having a gas adsorption surface,
The air passage is a corrugated structure made of activated carbon fiber sheet,
The triangular dimension of the ventilation cross section of the corrugated structure is given by the following Gormley and Kennedy theory.
The removal parameter using the concept of removal efficiency (f) based on equation (3), equivalent diameter (δ)
In the formulas (4) and (5) of (μ) , f is designed to be 50 or more and stored in a rectangular parallelepiped housing,

Only the volatile organic compounds contained in the indoor air and the volatile organic compounds separated by the difference in the diffusion coefficient of the particles and diffusing on the surface of the activated carbon fiber sheet are adsorbed on the surface of the air passage by a non-filtering method. It consists of a scrubber unit that is designed to be removed,
An indoor air purification apparatus comprising a dust removal filter for removing particles separated from volatile organic compounds at a subsequent stage of the air passage. The indoor air purifier according to claim 1 or 3, wherein a plurality of scrubber units are connected in series in a ventilation direction.

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