JP2012202985A - Radioactive gas purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a device for performing purification inside each room has not been developed for occasions where a nuclear facility itself is destroyed by an earthquake, tsunami or the like, thereby to discharge a small amount of radioactive gas containing iodine from the nuclear facility and to contaminate adjacent houses, offices, factory plants and the like in the circumferences.SOLUTION: A small amount of radioactive gas and particles containing iodine coming into a room are purified by a radioactive gas purifier, where a prefilter, an adsorption panel, a blower, and a mid-to-high-performance or HEPA filter are incorporated inside a box shape body having an air suction port and an air blow-out port, and returned to the room. The processing is repeated thereby to exchange air inside the room into purified air.

Description

  The present invention relates to a radioactive gas cleaning apparatus that processes radioactive gas and particles containing iodine and the like that have entered a room of a house, office, factory facility, etc., and cleans the room.

  Conventionally, a device that absorbs and removes radioactive gas containing iodine etc. discharged from nuclear power plants and nuclear fuel reprocessing plants does not operate normally, or abnormalities occur in the plant or factory, and radioactive materials containing iodine etc. An emergency radioactive gas treatment device is provided for the purpose of preventing or reducing the emission from the nuclear facility when the gas is full.

  However, if the nuclear facilities themselves are destroyed by an earthquake, tsunami, etc., and a small amount of radioactive gas containing iodine is released from the nuclear facilities, contaminating nearby houses, offices, factory facilities, etc. At present, no device for cleaning is considered.

  Therefore, the present invention is intended to solve these problems, and the first object is to remove iodine and particles in the radioactive gas that has entered the room of a house, office, factory facility, etc., and to clean the room. It is a thing.

  Another object of the present invention is to reduce the concentration of iodine in the indoor radioactive gas by a simple operation such as installing a radioactive gas cleaning device in the room and simply pressing the power switch of the radioactive gas cleaning device. It is what.

  Another object of the present invention is to blow out clean air, from which particles such as dust and dust in the indoor radioactive gas are removed, into the room.

  Another object of the present invention is to freely move to a place where it is installed.

    A first solution of the present invention is characterized in that a pre-filter, an adsorption panel, a blower, and a particle removal filter such as medium-high performance or HEPA are incorporated in a box-shaped main body in which a suction port and a blow-out port are formed. Radioactive gas cleaning device.

  The second solving means of the present invention is characterized in that an adsorption panel containing an adsorbent having a function of removing iodine in a radioactive gas is attached to a frame provided in the main body in a flat plate shape or a zigzag shape. Is.

  The third solving means of the present invention is characterized in that a pre-filter is provided on the upstream side of the adsorption panel, and a particle removal filter such as medium or high performance or HEPA is provided on the downstream side of the adsorption panel.

  The fourth solving means of the present invention is characterized in that an air suction port is formed in the main body, a blow-out port is formed in the upper part, and a caster is attached to the bottom part.

The adsorbent having the function of removing iodine in the radioactive gas is in the form of particles or nonwoven fabric obtained by graft polymerization of ion exchange groups on a substrate.
The substrate may be an adsorptive substance that can be graft-polymerized with ion exchange groups, such as activated carbon, zeolite, activated carbon, impregnated activated carbon or zeolite with silver such as potassium iodide or silver nitrate added to the zeolite, inorganic porous material. Body, organic synthetic resin such as polyethylene, and organic porous body such as polymer porous body.

  As a method for graft polymerization of these exchange groups onto a substrate, a conventionally known graft polymerization method can be employed. For example, a radical is generated on the substrate by irradiation with ultraviolet rays, plasma, ionizing radiation, etc., and a predetermined exchange group is formed. It can be formed by polymerization.

Further, the adsorption panel is configured by filling the adsorbent into a panel case constituted by sticking a punching plate on both sides of a quadrilateral frame in which one end of the frame is detachable.

  Then, replacement of the adsorbent to the adsorbing panel is performed by using one end of the frame as a lid of the panel case, and exchanging the adsorbent by removing the lid and taking in and out the adsorbent from above.

  In addition, the pre-filter on the upstream side of the suction panel is attached to the filter holding frame via an adhesive or a locking claw.

  The prefilter is a filter frame made of a single filter medium sheet made of glass fiber, nonwoven fabric, or synthetic fiber such as polyester fiber, polyamide fiber, polyolefin fiber, or rayon fiber by a wet papermaking method, dry method, spunbond method, melt blow method, or the like. It is attached to.

  In addition, the prefilter desirably has an average removal efficiency of 20 to 80% by a colorimetric method.

  Next, the particle removal filter such as medium performance or HEPA has a fiber diameter of 6 μm or less (center fiber diameter: around 3.5 μm) and 93% by weight or more of glass fiber, nonwoven fabric, polyester fiber, polyamide fiber, polyolefin fiber. In addition, a single filter media sheet formed by a wet papermaking method, a dry method, a spunbond method, a melt blow method, or the like, by combining synthetic fibers such as rayon fibers or the like as appropriate, is folded in a zigzag shape to form a filter media. It is formed in a cell type with airtightness by attaching rigid packing so that the filter media do not adhere to each other with beads applied between filter media folded in zigzags or sandwiching appropriate separators. It is.

  And the filter medium sheet of the particle removal filter such as medium-high performance or HEPA has a sheet thickness of 0.2 to 2.0 mm, and has a collection efficiency of 80 to 99.99% with respect to particles having a particle diameter of 0.3 μm. is doing.

  Even if the efficiency and numbers are variously changed depending on the filter arrangement of each stage, the gist is not changed.

  The effect | action by the said problem-solving means is as follows. First, radioactive gas released from nuclear equipment that has entered a room such as a house, office, factory facility, etc. by intake operation of a blower incorporated in the main body is taken into the main body from an air suction port formed in the main body. Next, relatively large dust such as dust and dust in the gas introduced into the main body is removed by a prefilter. And the load to the adsorption | suction panel of a back | latter stage can be reduced now.

  Next, the gas from which relatively large dust has been removed passes through the adsorption panel. At this time, iodine or the like in the radioactive gas is removed by the adsorbent filled in the adsorption panel.

  Further, the relatively large dust and gas from which the iodine in the radioactive gas has been removed after passing through the adsorption panel passes through a particle removal filter such as medium-high performance or HEPA having a high collection efficiency for fine particles. At that time, the fine particle size dust contained in the air is removed and discharged as clean air into the room through an air outlet formed in the main body.

  Then, by continuing the above operation, the whole indoor gas of radioactive gas containing iodine is gradually purified, and finally the room is filled with clean air.

As described above, the radioactive gas cleaning device of the present invention has the following effects.
(1) The radioactive gas cleaning device is composed of a pre-filter built in a box-shaped body, an adsorption panel, a blower, and a medium-high performance filter. The structure is very simple and easy to handle. In addition, the installation space can be reduced and on-site installation can be simplified.
(2) Since the adsorption panel is filled with an adsorbent having a function of removing radioactive iodine, the radioactive iodine is removed from the gas that has passed through the adsorption panel.
(3) Further, since the gas from which radioactive iodine has been removed is discharged into the room from the air outlet after fine particle size dust is removed by a particle removal filter such as medium or high performance or HEPA, the purified gas is discharged into the room. To be supplied. By repeating these operations, the indoor air is surely cleaned, and the health of the personnel in the room can be maintained.
(4) Since a pre-filter is installed in front of the suction panel, the concentration of dust flowing into the suction panel can be greatly reduced, the increase in pressure loss of the suction panel can be suppressed, and the life can be extended. Total cost including running Can be saved.
(5) Since the caster is attached to the bottom of the box-shaped main body, it can be freely moved to a place where it is desired to be installed indoors.

The front view of Example 1 of this invention is shown. The top view of FIG. 1 is shown. The left view of FIG. 1 which shows the inside of 1 part. The right view of FIG. 1 is shown. The front view of this invention Example 2 which shows 1 part inside. The top view of FIG. 5 is shown. The left view of FIG. 5 which shows the inside of 1 part. The right view of FIG. 5 is shown. The front view of this invention Example 2 which shows 1 part inside. The top view of FIG. 5 is shown. The left view of FIG. 5 which shows the inside of 1 part. The right view of FIG. 5 is shown.

  Hereinafter, the radioactive gas cleaning apparatus of the present invention will be described in detail with reference to the drawings.

  A radioactive gas cleaning device when installed in a residential room will be described with reference to FIGS. Reference numeral 1 denotes a box-shaped main body, and the main body 1 is composed of side plates 2 and 3, a front door 4 hinged to one side plate 2, a bottom plate 6 to which casters 5 are attached, an upper plate 7 and a back plate 8. ing. An air suction port 9 is formed in front of the front door 4.

  Moreover, the adsorption | suction panel 10 is attached to the inside of the main body 1 so that it may attach to a flat plate shape airtightly.

  A pre-filter 11 is attached to the frame on the upstream side of the suction panel 10 in the air flow direction, and a medium-high performance or HEPA filter 12 is attached to the frame on the downstream side in the air flow direction. A blower 13 is installed downstream of the medium / high performance or HEPA filter 12. Further, an air outlet 14 is formed in the upper plate 7.

  Since the structure of Example 1 is such a simple structure, the gas in the room containing the radioactive gas containing iodine by the intake operation of the blower 13 in the main body 1 is supplied from the air suction port 9 formed in the main body 1. It is taken in. Then, relatively large dust such as dust and dust is removed from the gas taken into the main body 1 by the prefilter 11 and passes through the adsorption panel. The adsorption panel 10 removes iodine such as radioactive gas.

  Further, the air that has passed through the adsorption panel 10 is discharged into the room through an air outlet 14 formed on the upper plate 7 as a fine gas from which fine particle size dust has been removed by the medium or high performance or HEPA filter filter 12.

  Then, by continuing the above operation, the whole indoor gas of radioactive gas containing iodine is gradually purified, and finally the room is filled with clean air.

  A radioactive gas cleaning apparatus when installed in an office room will be described with reference to FIGS. Reference numeral 21 denotes a box-shaped main body, and the main body 21 includes side plates 22 and 23, a front door 24 hinged to one side plate 22, a bottom plate 26 to which casters 25 are attached, an upper plate 27, and a back plate 28. ing. Air suction ports 29 are formed in the bottoms of the side plates 22 and 23 and the front door 24, respectively. Further, an air outlet 30 is formed in the upper part of the front door 24.

  An adsorption panel 31 is attached to the frame in a zigzag manner in an airtight manner inside the main body 21.

  A pre-filter 32 is attached to the frame on the upstream side of the suction panel 31 in the airflow direction, and a medium-high performance or HEPA filter 33 is attached to the frame on the downstream side in the airflow direction. A blower 34 is installed in front of the medium / high performance or HEPA filter 33.

  Since the structure of the second embodiment is such a simple structure, the gas in the room containing the radioactive gas containing iodine due to the intake operation of the blower 34 in the main body 21 is supplied from the air suction port 29 formed in the main body 21. 21. Then, relatively large dust such as dust and dust is removed from the air taken into the main body 21 by the prefilter 32 and passes through the suction panel 31. The adsorption panel 31 removes iodine such as radioactive gas.

  Further, the air that has passed through the adsorption panel 31 is discharged into the room through an air outlet 30 formed in the upper part of the front door 24 as fine air-particle dust is removed by the medium or high performance or HEPA filter 33 and clean air.

  By continuing the above operation, the radioactive gas containing iodine is gradually purified, and finally the whole room is filled with clean air.

  The radioactive gas cleaning device when installed in a large factory equipment room is shown in FIG. 9 to FIG. 12, but the structure and the operational effect are almost the same as those of the second embodiment. Detailed description is omitted.

  In this embodiment, one embodiment of the present invention has been described. The present invention is not limited to this embodiment, and the gist of the present invention is not changed at all by various modifications.

  A radioactive gas cleaning device is placed in a room such as a house, office, factory facility, etc., and the indoor air is purified and returned to the room as clean air, and this is repeated to replace the room air with clean air. It is very useful in practice.

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Side plate 3 ... Side plate 4 ... Front door 5 ... Caster 6 ... Bottom plate 7 ... Top plate 8 ... Back plate 9 ... Air Suction port 10 ... Adsorption panel 11 ... Pre-filter 12 ... Middle high performance filter 13 ... Blower 13
14 ... Air outlet 21 ... Main body 22 ... Side plate 23 ... Side plate 24 ... Front door 25 ... Caster 26 ... Bottom plate 27 ... Top plate 28 ...・ Backboard 28
DESCRIPTION OF SYMBOLS 29 ... Air suction port 30 ... Air blow-out port 31 ... Adsorption panel 32 ... Pre filter 33 ... Middle high performance filter 34 ... Blower

Claims (4)

  A radioactive gas cleaning device comprising a pre-filter, an adsorption panel, a blower, and a removal filter such as medium-high performance or HEPA in a box-shaped main body having an air inlet and an air outlet.   2. The radioactive gas cleaning device according to claim 1, wherein a pre-filter is provided on the upstream side in the air flow direction of the adsorption panel, and a removal filter such as a medium / high performance or HEPA and a blower are provided on the downstream side in the air flow direction.   The radioactive gas cleaning apparatus according to claim 1, wherein the adsorption panel is filled with an adsorbent having a function of removing radioactive substances such as radioactive iodine contained in the polluted gas.   2. The radioactive gas cleaning device according to claim 1, wherein the adsorption panel is attached to a frame provided in the main body in a flat plate shape or a zigzag shape.

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