JP2010181407A - Burnable filter device for adsorption of radioactive gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a scavenging removal function for radioactive gaseous contents generated in medical and nuclear facilities by remarkably reducing the weight of a filter device set up in an air cleaner and also improving the usability of the device just through the replacement of it without altering any structures of the existing air cleaner. <P>SOLUTION: The filter device 10 set up from the upstream side 2 toward the downstream side 3 in the air flow direction of the air cleaner 1 placed in air conditioning facilities is laid by cutting sheet active carbon fibers into discrete subfragments 12a and stuffing each of the subfragments 12a like flocculate into a wooden or plastic, lightweight and burnable filter box 11. Moreover, an HEPA filter 71 and an active carbon fiber filter 72 are built unitarily into the same filter device 70. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention can significantly reduce the weight of the collection and removal of radioactive gas generated in medical facilities, nuclear facilities, etc., and can efficiently collect and remove the gas, thereby improving space and operability. The present invention relates to an incineration filter device for adsorbing radioactive gas.

  Conventionally, since radioactive gases such as radioactive iodine are discharged in medical facilities and nuclear facilities, an air purifier is installed in the gas processing path of the air conditioning facility, and the concentration of the generated radioactive gas is regulated by law. After being reduced below the standard value, it is discharged outside the facility.

  In recent years, with the increasing use of nuclear technology, the amount of radioactive gas emitted at university research facilities, medical facilities, and nuclear power plants has been increasing. In addition, due to environmental considerations, it has been released into the atmosphere. The regulation of the concentration of radioactive gas to be generated has been set more strictly.

  Conventionally, as shown in FIG. 5, a radioactive gas air purifier has a relatively large coarse dust sequentially from the upstream side (suction port side 2) to the downstream side (outlet side 3) in the air flow direction of the air purification device 1. A pre-filter 4 that removes air, a high-performance filter (HEPA filter) 5 that removes dust at a higher stage, and a charcoal filter 6 that collects and removes radioactive gas at the rear stage of the high-performance filter 5. Radioactive gas is being collected and removed. The filter device 7 for storing the charcoal filter 6 is composed of powdered or granular activated carbon (not shown) and packed in a frame (not shown) capable of withstanding the weight. .

  On the other hand, Patent Document 1 discloses “a plurality of corrugated or flat sheet-like adsorbents 1a and 1b made of a high-density sintered sheet of activated carbon fibers as adsorbent 1 as an activated carbon filter” ( Paragraph [0018] etc.). Further, in this Patent Document 1, a filter device having a configuration packed in a frame as described above is described as “a plurality of such activated carbon units 6 includes a plurality of mounting portions 9 formed vertically and horizontally in a box 8. The box 8 and the activated carbon unit 6 constitute a filter module 10 (see FIG. 3 in paragraph [0020]).

  Further, Patent Document 2 discloses a “filter material that is a filter that is folded in a zigzag manner and folded in a zigzag manner” (see “Claims”).

Japanese Utility Model Publication No. 6-47899 JP 2006-838 A

  As described above, the filter device of the conventional charcoal filter is configured to be packed with powdered or granular activated carbon which is a heavy material, but in recent years, in order to reduce weight, the activated carbon fiber sheet and the like, A filter device in which the sheet is folded in a zigzag shape has been proposed.

  However, there is a problem that it is costly to replace a conventional (existing) heavy filter device with a new lightweight filter device. That is, a situation occurs in which an existing air purification device must be replaced or modified.

  The applicant of the present application does not replace the existing (existing) air purification device with a new air purification device, but significantly reduces the weight and can reduce the cost. As a result of earnest research on the filter device, the present invention has been completed.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to reduce the weight of an air purification device that collects and removes radioactive gas and to reduce the existing air purification device. Therefore, an object of the present invention is to provide an incineration filter device for adsorbing radioactive gas, which can reduce the cost without replacing or modifying the device.

The present invention provides a filter device arranged from the upstream side to the downstream side in the air flow direction of the air purification device installed in the air conditioning facility as described in claim 1 in order to make the object as described above wrong. The filter device cut the sheet-like activated carbon fibers into discrete pieces, and the fine pieces were stuffed into a cotton or plastic lightweight and incinerated filter box and laid in a cotton form. It is characterized by.
According to a second aspect of the present invention, each of the fine pieces is pressed and fixed by a light or incinerator punching plate made of wood or plastic having a plurality of punching holes.
According to a third aspect of the present invention, the diameter of the punching hole is established as a diameter at which granular or granular activated carbon does not escape.
According to a fourth aspect of the present invention, the filter device is arranged from the upstream side to the downstream side in the airflow direction of the filter box and is arranged in a zigzag shape in a direction perpendicular to the airflow direction. It is characterized by. The filter device for adsorbing radioactive gas according to claim 2 or 3.
Further, as described in claim 5, in the filter device installed in the ventilation path of the air purification device in the air conditioning facility, and arranged from the inflow direction of the radioactive gas to the outflow direction,
A HEPA filter folded in a zigzag shape is arranged on the gas inflow side, an activated carbon fiber filter folded in a zigzag shape is arranged on the gas outflow side, and the HEPA filter and the activated carbon fiber are arranged The filter is integrated in the outer frame with a slight clearance.
Further, as described in claim 6, in the filter device installed in the ventilation path of the air purification device in the air conditioning facility, and arranged from the inflow direction of the radioactive gas to the outflow direction,
A HEPA filter folded in a zigzag shape is arranged on the gas inflow side, an activated carbon fiber filter folded in a zigzag shape is arranged on the gas outflow side, and the HEPA filter and the activated carbon fiber are arranged The filter is a filter device for adsorbing radioactive gas, wherein the opening directions of the filters are arranged so that their phases are different from each other by 90 degrees, and the filters are integrated within the outer frame with a slight clearance.
According to a seventh aspect of the present invention, the processing air volume for dust removal that passes through the frame body is 28 to 31 m ³ / min.
Further, as described in claim 8, the outer frame of the HEPA filter and the activated carbon fiber filter is formed of a lightweight and incinerator member.
According to a ninth aspect of the present invention, the HEPA filter and the activated carbon fiber filter are characterized in that spacers are attached to the front and back surfaces of a lightweight and incinerator member.
According to a tenth aspect of the present invention, the activated carbon fiber filter is sandwiched between electret filter cloths.

As described above, according to the present invention, the adsorption filter device that collects and removes the radioactive gas is cut into sheet-like activated carbon fibers as separate pieces, and each piece is made of wood or Since it is packed and laid in a plastic light weight incinerated filter box in a cotton shape, the packed activated carbon fiber can be packed without omission. In addition, the existing air purification device is not modified as a new air purification device, but is simply incorporated as the filter device of this embodiment formed in the same dimensions as the existing filter device. A new air purifying apparatus having an excellent function that can be removed can be obtained, and the weight can be remarkably reduced, the operability as handling can be improved, and the cost can be reduced.
According to the third and fourth embodiments, in particular, the filter device for adsorbing dust and radioactive gas is formed as a filter device having the same dimensions as the existing filter device without any modification of the existing air purification device. By simply incorporating (recombining) into an existing air purification device, a new air purification device with an excellent function capable of collecting and removing radioactive gas can be obtained, and it has excellent weight efficiency and space efficiency and operability. It is.
At the same time, conventionally, the HEPA filter and the activated carbon fiber filter are separately incorporated in each filter device, but the HEPA filter and the activated carbon fiber filter are integrated in the same filter device. Since it is built in, it is integrated because it is reduced in weight, and is excellent in space efficiency and operability.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an internal schematic structure of a filter device according to the present invention, FIG. 2 is a sectional view for explanation of FIG. 1, and FIG. 3 is a schematic diagram showing a case where filter devices based on FIG. FIG.

  Since the schematic configuration of this air purification device is the same as that of the conventional air purification device 1 shown in FIG. 4, the air purification device 1 will be used for explanation. That is, the pre-filter 4 that sequentially removes relatively large coarse dust from the upstream side (suction port side 2) to the downstream side (outlet side 3) in the airflow direction of the air purification device 1, and higher dust removal at the subsequent stage A high-performance filter (HEPA filter) 5 that performs the above and a charcoal filter 6 that collects and removes the radioactive gas are disposed after the high-performance filter 5 to collect and remove the radioactive gas.

  As shown in FIG. 1, the filter device 10 installed in the air purification device 1 includes a filter box 11 and a filter 12. The left and right width directions of the filter box 11 are formed of a hollow housing that is covered with wooden side plates 11a and 11a that are lightweight and can be incinerated, and whose upper and lower portions are covered with a wooden top plate 11b and a bottom plate 11c.

  And in this hollow filter box 11, the fine piece 12a which cut | disconnected the activated carbon fiber sheet | seat apart was formed, and this fine piece 12a, ... was packed in cotton shape, and was laid. Is installed. The filter 12 in the filter box 11 allows the radioactive gas to pass from the upstream side (left side in the figure) to the downstream side (right side in the figure) in the airflow direction, and thereby the radioactive gas component is adsorbed. .

The chopped and cut filter 12 is obtained by cutting a sheet of activated carbon fiber as described above. For example, the BET method has a specific surface area of 700 m ² / or more, and a BJH (Barrett-Jdyner-Halenda) method. For micropores, a pore volume of 3 to 30 nm calculated from the pore distribution determined by the HK (Horvath-Kawazoe) method is 0.15 cc / g or less, and a pore volume of less than 3 nm. Those having a pore characteristic of 0.50 cc / g or more are preferable because the organic iodine compound is easily desorbed and desorbed by heating. The form is not particularly limited as long as it is a nonwoven fabric, a woven fabric, a knitted fabric, or a paper-like material.

That is, the sheet-shaped charcoal filter has a minimum collection efficiency of 99,97% for 0.3 μm particles, a specific surface area of 1000 to 2000 m ² / g, and a pore diameter in the range of 5 to 100 mm. Some activated carbonized and fibrous filters. The sheet-shaped charcoal filter braided with fibrous activated carbon is woven, non-woven, honeycomb, paper or the like.

  Further, stuffing in the form of cotton and laying in the filter box 11 means “a soft lump of fibers spun from cotton seed” and means “a light, breathable and soft lump”.

  In addition, the filter device 10 in which the filter 12 as described above is packed in the filter box 11 can be incinerated with punching holes 13a in the filter box 11, as shown in FIG. It is pressed by a wooden or plastic punching plate 13.

  The punching hole 13a is opened with a diameter that does not allow the granular or granular activated carbon to escape. That is, it is important that the cut and formed fine pieces 12a,... Have a diameter that does not easily come out of the punching holes 13a,.

As will be described later, since the filter device 10 is formed in the same manner as a conventional filter device, that is, a box, when the filter device 11 is packed in the filter box 11, the fine fragments 12a,. If there is, At this time, the punching plate 13 is pressed using a hollow pressing tool 14 as shown in FIG. For example, even if the filter 12 is half the size of the existing filter device 1 as in the prior art, such as 292 mm × 1/2, the space S can ensure a sufficient processing capacity.

  A suitable material for this type of filter is trade name: activated carbon fiber KF (manufactured by Toyobo Co., Ltd.). Even in a thin sheet form, a fine adsorbed substance can be almost completely collected and removed, and the adsorption capacity is a remarkably large adsorption material as compared with powdered or granular activated carbon. The DOP test method ensures a minimum collection efficiency of 99.97% for 0.3 μm particles. The DOP test method is used as a method for measuring the efficiency of a HEPA filter, and is based on a standard request from the US Atomic Energy Commission by a kind of light scattering method.

  Thus, according to the above-described embodiment, the filter device 10 for adsorbing dust and radioactive gas has the same dimensions as the existing filter device 2 without modifying the existing air purification device 1. As a new air purification device capable of collecting and removing radioactive gas simply by being incorporated into the existing air purification device 1.

  FIG. 3 shows a second embodiment. FIG. 2 shows the filter device 10 provided in multiple stages. Each filter device 10 is arranged from the upstream side to the downstream side in the airflow direction, but is arranged in a zigzag shape in a direction perpendicular to the airflow direction, and is used as a tray-type filter device.

Next, a third embodiment and a fourth embodiment are shown in FIGS.
What is shown in this embodiment is that the filter device 70 for adsorbing dust and radioactive gas, in particular, is formed without modifying the existing air purification device 1, that is, with the same dimensions as the existing filter device 2. By simply incorporating it into the existing air purification device 1 as the filter device 70 as an example, a new air purification device having an excellent function capable of collecting and removing radioactive gas can be obtained, which is excellent in weight reduction and space efficiency and operation. It has excellent properties.

  At the same time, conventionally, the HEPA filter and the activated carbon fiber filter are separately incorporated in the respective filter devices 5 and 6, but in this embodiment, the HEPA filter and the activated carbon fiber filter are the same. In other words, the same filter device 70 means that the conventional HEPA filter 5 is integrated into the activated carbon fiber filter 6 so that the weight and weight of the filter device 70 can be reduced. Integration is achieved, and space efficiency and operability are excellent.

This will be described based on a specific example. Note that the same members as those in the prior art will be described with the same reference numerals.
As shown in the third embodiment, the filter device 70 installed in the ventilation path of the air purification device 1 in the air conditioning facility and arranged from the inflow direction to the outflow direction of the radioactive gas has a zigzag shape on the gas inflow side. A HEPA filter 71 that is folded in a zigzag manner is disposed on the gas outflow side, and an activated carbon fiber filter 72 that is folded in a zigzag manner is disposed.
The HEPA filter 71 and the activated carbon fiber filter 72 (charcoal filter) are integrated in the outer frame 70a with a slight clearance S. For this integration, various joining techniques can be used.
In addition, the radioactive gas adsorption filter device 70 has a dust removal processing air flow rate of 28 to 31 m ³ / min that passes through the frame 70a.

As a fourth embodiment, the filter device 70 installed in the ventilation path of the air purification device 1 in the air conditioning facility and arranged from the inflow direction to the outflow direction of the radioactive gas has a zigzag shape on the gas inflow side. A HEPA filter 71 that is folded in a zigzag manner is disposed on the gas outflow side, and an activated carbon fiber filter 72 that is folded in a zigzag manner is disposed.
The HEPA filter 71 and the activated carbon fiber filter 72 (charcoal filter) are arranged so that their opening directions are 90 degrees out of phase with each other, and are integrated within the outer frame 70a with a slight clearance S. Has been.
In addition, the radioactive gas adsorption filter device 70 has a dust removal processing air flow rate of 28 to 31 m ³ / min that passes through the frame 70a.

  Thus, the HEPA filter 71 and the activated carbon fiber filter 72 are arranged so that their opening directions are 90 degrees out of phase with each other, and are integrated within the outer frame 70a with a slight clearance S. Thus, a new air purification device capable of better collecting and removing radioactive gas can be obtained.

The outer frame 70a of the HEPA filter 71 and the activated carbon fiber filter 72 is formed of a lightweight and incinerator member, the volume reduction ratio is 1/300 or less, and the weight is 1/5 or less that of the conventional product. Therefore, an epoch-making air filter which is light in weight and whose collection ability is hardly deteriorated is constituted.
Lightweight incinerator members include other plastics such as wood, but are not limited thereto as long as they burn in air.

Further, since the HEPA filter 71 and the activated carbon fiber filter 72 are attached with spacers V, which are lightweight and incinerators, on the front and back sides, the filter device 70 as a filter medium is thin and has a large number of folds. The speed (passing wind speed) is small, and it is possible to improve the collection efficiency and stabilize the filter medium.
Examples of combustible materials include plastics such as wood, papers, and fiber-formed products, but are not limited thereto as long as they combust in air.

  In addition, since the activated carbon fiber filter 72 is sandwiched between electret filter cloths, it is less likely to deteriorate due to atmospheric weathering, and can maintain a high collection efficiency about three times that of the conventional product (compared to our company) (24 hours a day). (The weathering for 360 days is 98% or more) and the retention rate is high, and the captured iodine is not released.

Thus, what is shown in the embodiment is that the filter device for adsorbing dust and radioactive gas, in particular, is formed without modifying the existing air purification device 1, that is, with the same size as the existing filter device. By simply incorporating it into the existing air purification device as a filter device of the embodiment, it can be a new air purification device having an excellent function capable of collecting and removing radioactive gas, and it is excellent in weight reduction and space efficiency and operability. It is excellent.
At the same time, conventionally, the HEPA filter and the activated carbon fiber filter are separately incorporated in each filter device, but the HEPA filter and the activated carbon fiber filter are integrated in the same filter device. In other words, the same filter device means that the conventional HEPA filter is integrated into the activated carbon fiber filter, so that it is lighter and more integrated, and space efficiency and operability are achieved. Etc.

  The configuration of the filter device can be variously modified, and can also be applied to air conditioning other than the discharge of radioactive gas such as radioactive iodine in medical facilities or nuclear facilities.

  It is explanatory drawing which shows the internal schematic structure of the filter apparatus which concerns on this invention.   It is sectional drawing for description of FIG.   It is a schematic structure figure which shows the case where the filter apparatus based on FIG.   It is a schematic diagram which shows the conventional air purification apparatus of radioactive gas.   It is side surface vertical crushing sectional drawing which shows the 3rd and 4th Example.   It is a plane transverse crushing sectional view showing the 3rd and 4th examples.   It is a reference figure which shows an internal structure.

DESCRIPTION OF SYMBOLS 10 Filter apparatus 11 Filter box 12 Filter 12a Fine piece 13 Punching plate 13a Punch hole 70 Filter apparatus 70a Outer frame 71 HEPA filter 72 Activated carbon fiber filter S Clearance

Claims (10)

In the filter device arranged from the upstream side to the downstream side in the air flow direction of the air purification device installed in the air conditioning facility,
The filter device is characterized in that the sheet-like activated carbon fiber is cut into pieces in a disjointed state, and the fine pieces are stuffed into a cotton or plastic lightly incinerated filter box and laid. An incineration filter device for adsorbing radioactive gases.   2. The filter device for adsorbing radioactive gas according to claim 1, wherein each of the fine pieces is pressed and fixed by a light or incinerator punching plate made of wood or plastic having a plurality of punching holes.   3. The filter device for adsorbing a radioactive gas according to claim 2, wherein the punching hole is opened as a diameter from which granular or granular activated carbon does not escape.   The said filter apparatus is arrange | positioned from the upstream of the airflow direction of the said filter box to the downstream, and is arrange | positioned by the zigzag shape to the orthogonal | vertical direction with respect to the said airflow direction. Filter device for radioactive gas adsorption. In the filter device installed in the ventilation path of the air purification device in the air conditioning facility and arranged from the inflow direction of the radioactive gas to the outflow direction,
A HEPA filter folded in a zigzag shape is arranged on the gas inflow side, an activated carbon fiber filter folded in a zigzag shape is arranged on the gas outflow side, and the HEPA filter and the activated carbon fiber are arranged A filter device for adsorbing radioactive gas, wherein the filter is integrated within the outer frame with a slight clearance. In the filter device installed in the ventilation path of the air purification device in the air conditioning facility and arranged from the inflow direction of the radioactive gas to the outflow direction,
A HEPA filter folded in a zigzag shape is arranged on the gas inflow side, an activated carbon fiber filter folded in a zigzag shape is arranged on the gas outflow side, and the HEPA filter and the activated carbon fiber are arranged The filter is a filter device for adsorbing radioactive gas, wherein the opening directions of the filters are arranged so that their phases are different from each other by 90 degrees, and are integrated within the outer frame with a slight clearance. Suction filter apparatus of radioactive gas according to claim 6 or 7, wherein the process air volume for dust passing through the frame body is characterized in that it is a 28~31m 3 ^/ min.   The radioactive gas adsorption filter device according to claim 5 or 6, wherein the outer frame of the HEPA filter and the activated carbon fiber filter is formed of a lightweight and incinerator member.   The radioactive gas adsorption filter device according to claim 5 or 6, wherein the HEPA filter and the activated carbon fiber filter have light and incinerator spacers attached to the front and back sides.   64. The radioactive gas adsorption filter device according to claim 5 or 63, wherein the activated carbon fiber filter is sandwiched between electret filter cloths.

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