JP2013200177A - Cesium removal processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cesium removal processing device which can efficiently perform removal processing of cesium from various gases, such as the outside air contaminated with cesium, and the gas including cesium from a combustion furnace and other facilities.SOLUTION: The cesium removal processing device is a device for performing removal processing of cesium in gases, and includes a humidifier for humidification of gases, and a cesium removal filter for removing cesium in the gases humidified by the humidifier.

Description

  The present invention relates to an apparatus for removing cesium in a gas.

  The building is equipped with a duct for taking in outside air to ventilate the inside air. The outside air contains various impurities, such as dust, and a filter is disposed in the duct to remove these from the outside air (see Patent Document 1).

  Conversely, these filters may also be arranged in ducts for exhausting gas from buildings such as factories and processing facilities. For example, in incinerators or other facilities, filters are used to remove dust and harmful substances contained in exhaust gas generated by incineration.

JP 2000-249380 A

  Here, in addition to dust, radioactive elements, particularly cesium having a long half-life, may be contained as impurities in the outside air. If this cesium in the outside air enters a building or the like, it naturally has an adverse effect on indoor people.

  In addition, if high concentrations of cesium are contained in exhaust gas from incinerators or gas released from other facilities, etc., and released into the atmosphere, not only around these facilities but also several hundred km This also affects people in remote areas.

  The present inventors have intensively studied about this cesium and found that cesium in the gas could not be efficiently removed only by the conventional HEPA filter or zeolite filter for removing dust.

  Therefore, the present invention has been made in view of the above-mentioned problems. For example, cesium is extracted from various gases such as outside air contaminated with cesium and gas containing cesium from an incinerator or other facilities. It is an object of the present invention to provide a cesium removal processing apparatus that can efficiently perform a removal process.

  In order to achieve the above object, the present invention is an apparatus for removing cesium in a gas, the humidifier for humidifying the gas, and removing the cesium in the gas humidified by the humidifier. There is provided a cesium removal processing apparatus characterized by comprising a cesium removal filter.

If it is such a cesium removal processing apparatus of this invention, the cesium in gas can be removed. In addition, the gas to be treated is humidified by a humidifier, and cesium in the gas can be ionized, and cesium can be efficiently removed by the cesium removal filter.
Therefore, it is possible to process a gas in the outside air or in a facility to obtain a gas in which contamination by cesium is greatly suppressed, and to prevent a person in contact with the gas from receiving radioactive contamination. It is possible to prevent a person inside the building or a person away from the contaminated area from being adversely affected by the gas contaminated with cesium.

Moreover, the said humidifier shall humidify gas to 50% or more of humidity.
If it is such, cesium can be ionized more effectively and cesium can be removed more efficiently.

  The cesium removal treatment apparatus may further include a drain pipe, and the drain pipe may be used for draining drain water from the gas from which cesium has been removed by the cesium removal filter.

  If it is such, the drain water condensed in the apparatus can be extracted appropriately, and it can suppress that water accumulates in an apparatus. And since it is drain water from the gas from which the cesium was removed, the water extracted from the inside of an apparatus does not contain cesium, and a process is easy.

The cesium removal processing apparatus may further include a dehumidifier, and the dehumidifier may dehumidify the gas from which cesium has been removed by the cesium removal filter.
If this is the case, it is possible to dehumidify the gas after removing cesium and reduce the humidity, so there is a problem for people and other facilities due to the high humidity of the gas from the cesium removal treatment device. It can be prevented from occurring.

  The cesium removal processing apparatus may further include a fan, and the fan may be for sucking gas into the apparatus.

  With such a configuration, gas can be efficiently sucked into the apparatus for processing.

  Moreover, the said cesium removal processing apparatus shall further be equipped with the dust removal filter for removing the dust in gas.

  If this is the case, when dust is present in the gas, in addition to cesium, the dust can be removed, and the dust prevents the cesium removal filter from becoming clogged and reducing the removal efficiency of cesium. be able to.

  The cesium removal processing apparatus has a flange portion for connection on the air supply side, and the flange portion on the air supply side can be connected to an intake duct of a building, and removes cesium in the outside air. And can be sent into the building.

  If this is the case, cesium in the outside air can be removed, and the removed outside air can be sent into the building through the intake duct. It is safe without being subjected to radioactive contamination by cesium.

  Further, the cesium removal processing apparatus has a flange portion for connection on the intake side, and the flange portion on the intake side can be connected to an exhaust duct that emits gas contaminated with cesium, The cesium can be removed.

  In such a case, cesium contaminated gas is introduced into the apparatus from an exhaust duct, that is, for example, an incinerator or other facility that discharges internal gas to the outside. Therefore, it is possible to prevent the gas contaminated with cesium from being released from the facility to the atmosphere.

  The cesium removal processing apparatus further includes a housing, and the cesium removal filter is disposed in the housing, and the gas sucked into the housing is humidified by the humidifier and is added to the cesium. Cesium can be removed by a removal filter.

  If it is such, it can arrange | position an apparatus especially outdoors and can perform the removal process of a cesium within a housing | casing.

  As described above, with the cesium removal treatment apparatus of the present invention, the gas to be treated is humidified by the humidifier, and cesium can be ionized, and the cesium in the gas is efficiently removed by the cesium removal filter. It is possible. As a result, people can be prevented from being radioactively contaminated with gas contaminated with cesium.

It is the schematic which shows an example of the cesium removal processing apparatus (It is an indoor installation type and supplies air from the outdoors indoors) of this invention. It is a perspective view of a cesium removal processing apparatus. It is the schematic which shows an example of the cesium removal processing apparatus (it is an outdoor installation type and supplies air from the outdoors indoors) of this invention. It is the schematic which shows an example of the cesium removal processing apparatus of this invention of the outdoor installation type which has a roof with an angle with respect to the horizontal surface. It is the schematic which shows an example of the cesium removal processing apparatus (it is an outdoor installation type and supplies air from indoor to the outdoors) of this invention.

Hereinafter, although the cesium removal processing apparatus of the present invention will be described in detail as an example of an embodiment with reference to the drawings, the present invention is not limited thereto.
In FIG. 1, an example of the cesium removal processing apparatus of this invention is shown. This cesium removal treatment apparatus 1 is of a type installed indoors, and is for treating outside air and taking in clean air that is not contaminated with cesium indoors.

  The cesium removal processing apparatus 1 includes a housing 2, a humidifier 3, and a cesium removal filter 4. In addition, although the example which has the housing | casing 2 as mentioned above is shown in FIG. 1, it is not limited to this, A housing | casing is not provided but the humidifier 3 and cesium removal with respect to the duct etc. in a building It is also possible to arrange the filter 4 directly.

  Here, the housing | casing 2 should just be what can arrange | position the cesium removal filter 4 inside. In addition, in the example of FIG. 1, the humidifier 3 is arrange | positioned outside the housing | casing 2, However, It is not limited to this, It is also possible to arrange | position in the housing | casing 2. FIG. A thing of suitable shape and a size can be prepared so that it can be arrange | positioned inside a building, It does not specifically limit.

The casing 2 is provided with a gallery 5 so that outside air can be sucked from the gallery 5 arranged along the outer wall of the building. The gallery 5 itself is not specifically limited, For example, the thing similar to what is conventionally can be used.
Further, a humidification chamber 6 is provided in the housing 2, and the outside air sucked through the gallery 5 is humidified by the humidifier 3 in the humidification chamber 6.
Further, as described above, the casing 2 is provided with the cesium removal filter 4 so that cesium in the gas humidified in the humidification chamber 6 can be removed.

And the housing | casing 2 further has the flange part 7, This flange part 7 is connected with the duct 8 for inhaling the external air originally provided in the building. For this reason, the outside air from which cesium has been removed by the cesium removal filter 4 is sent from the flange portion 7 to the intake duct 8 and can be sent to each room in the building through the intake duct 8.
The shape and size of the flange portion 7 are not particularly limited, and can be appropriately determined according to the intake duct 8 of the building. Any material that can be easily attached to and detached from the intake duct 8 may be used.

  The humidifier 3 is not particularly limited as long as it is capable of generating steam and sending it to the humidifying chamber 6 and can humidify the outside air sucked into the humidifying chamber 6. For example, it can be the same as those commercially available. The humidification chamber 6 is provided with a hygrometer, and the humidity in the humidification chamber 6 can be automatically controlled according to the measured value of the hygrometer.

In particular, the inside of the humidifying chamber 6 is preferably humidified to a humidity of 50% or more. If it is such, the external air suck | inhaled in the humidification room 6 can fully be humidified, and the cesium in the external air can be ionized more efficiently and more reliably. By ionizing cesium, for example, cesium can be efficiently collected and removed from the outside air by a cesium removal filter 4 as described later.
Of course, the humidity is not limited to this numerical range, and the humidifier 3 can be used to adjust the humidity in the humidifying chamber 6 to an appropriate value each time. For example, by humidifying to 60% or more, cesium can be ionized more efficiently.

As the cesium removal filter 4, for example, Prussian blue can be added. This Prussian blue is a pigment having various commonly used names such as miloli blue, Berlin blue, and iron blue. A filter in which Prussian blue is supported on a nonwoven fabric or the like can be used.
Thereby, cesium can be selectively adsorbed and removed from the outside air. The ability to selectively remove cesium makes the processing of the filter itself relatively easy. Further, cesium does not easily leave the filter even after washing. Such a cesium removal filter 4 is commercially available from, for example, Japan Vilene Co., Ltd.

The cesium removal filter 4 carrying Prussian blue is considered to be capable of removing cesium by ion exchange or adsorption.
Cesium ions ionized by humidification have, for example, an ionic radius larger than that of ammonium ions, and the affinity with Prussian blue increases as the ionic radius increases, so that cations such as ammonium ions in Prussian blue are cesium. It can be replaced by ion exchange with ions.
Alternatively, it is considered that cesium ions are selectively adsorbed in the interval between Prussian blue crystals.

  Of course, the filter is not limited to the above-mentioned Prussian blue supported, and any filter can be used as long as it can efficiently collect and remove cesium present in the humidified gas.

  Conventionally, HEPA filters, zeolite filters, etc. have been adopted for dust removal, but these are not those that can selectively remove cesium, and other impurities are also collected, from the viewpoint of removing cesium. ineffective. Since other impurities are also collected, the exchange frequency is increased. Furthermore, since other impurities and cesium are collected, processing of the filter itself becomes difficult.

  The means for attaching the cesium removal filter 4 is not particularly limited, and may be fixed in a frame made of various materials, and the frame may be fixed in the housing 2. The material of the frame is not particularly limited, and can be determined as appropriate, such as aluminum, wood, and paper. It is even better if it can be processed together with the cesium removal filter 4.

  Further, the arrangement position, the number, and the like of the cesium removal filter 4 are not particularly limited and can be determined as appropriate. The arrangement position may be a position through which humidified outside air passes, and the number to be arranged may be determined according to the concentration of cesium in the outside air.

As described above, the casing 2, the humidifier 3, and the cesium removal filter 4 have been particularly described. However, the cesium removal processing apparatus 1 of the present invention further includes the following as necessary. Can do.
For example, the dehumidifier 9 is mentioned. If it is inconvenient for moist air to be sent into the building, a dehumidifier 9 can be further provided. It is not particularly limited as long as it can reduce the humidity of the humidified outside air, and commercially available products can be used. It arrange | positions rather than the cesium removal filter 4 with respect to the flow of outside air. It arrange | positions downstream in order to let the external air pass through the cesium removal filter 4 in the humidified state. For example, as shown in FIG. 1, it can be arranged downstream of the cesium removal filter 4 and before the flange portion 7 on the air supply side.

The casing 2 is provided with a drain pipe 10. The drain pipe 10 is not particularly limited as long as it drains water stored in the housing 2.
For example, first, it can be provided downstream of the cesium removal filter 4 with respect to the flow of outside air (drain pipe 10a). Since cesium is removed by the cesium removal filter 4, the drain water in the casing 2 downstream thereof does not contain cesium, and the drain water can be easily treated. In this case, in order to drain the drain water efficiently, a slope that is inclined downward toward the drain pipe 10a is provided on the floor of the casing 2 downstream of the cesium removal filter 4 in the casing 2. it can.

  Further, when the humidified outside air comes into contact with the cesium removal filter 4, cesium is removed as described above. On the other hand, water vapor in the outside air is condensed and flows downward through the cesium removal filter 4. And you may provide the drain pipe 10b separately in the position which contacts the lower end of the cesium removal filter 4. FIG. If it is such, cesium is removed by the cesium removal filter 4, and the drain water which does not contain cesium can be collect | recovered. It should be noted that an appropriate gradient is applied to the floor of the humidification chamber 6, for example, a gradient that is inclined downward from the cesium removal filter 4 toward the gallery 5 so that only the drain water transmitted through the cesium removal filter 4 can be recovered. It is preferable to provide and prevent drain water from other than the cesium removal filter 4 from entering the drain pipe 10b. Of course, a drain pipe for draining the drain water in the humidification chamber 6 can also be provided separately.

Moreover, the cesium removal processing apparatus 1 can further be provided with a fan 11 for sucking outside air. For example, it can arrange | position between the cesium removal filter 4 and the flange part 7 by the side of air supply. There is no particular limitation as long as the outside air can be taken into the cesium removal treatment apparatus 1 and the outside air can be supplied from the flange portion 7 to the intake duct 8 of the building. By providing such a fan 11, cesium removal processing can be performed by sucking and sending outside air more efficiently.
Of course, even if the fan 11 is not provided, it is possible to use the existing fan or the like provided in advance in the intake duct 8 or the like of the building to suck and send outside air.

Further, a dust removing filter 12 for removing dust in the outside air can be separately provided. The dust removal filter 12 is not particularly limited, and for example, a conventional filter can be used. A HEPA filter, a zeolite filter, etc. are mentioned.
For example, it can arrange | position upstream from the position which humidifies external air. By removing the dust in advance with the dust removing filter 12, it is possible to prevent the cesium removing ability of the cesium removing filter 4 from being lowered by the dust.
Of course, it is not limited to this arrangement position, and can be arranged downstream of the cesium removal filter 4 or both upstream and downstream. It can be determined appropriately depending on the amount of dust in the outside air. Adjustment may be made so that cesium in the outside air can be removed more efficiently by the cesium removal filter 4.

  FIG. 2 is a perspective view of the cesium removal processing apparatus 1. As shown in FIG. 2, an inspection port 13 can be appropriately provided so that each part in the housing 2 such as the cesium removal filter 4 can be inspected and replaced.

  With the cesium removal processing apparatus 1 of the present invention as described above, cesium in the outside air can be efficiently removed, and clean air that is not contaminated with cesium can be sent into the building. is there. Therefore, indoor people can be prevented from being radioactively contaminated by cesium in the outside air taken in.

  Next, FIG. 3 shows another example of the cesium removal processing apparatus of the present invention. This cesium removal processing apparatus 101 is of a type that is disposed outdoors, and is for processing clean air and taking in clean air that is not contaminated with cesium indoors.

The cesium removal processing apparatus 101 includes a housing 102, a humidifier 103, and a cesium removal filter 104.
Since the casing 102 is disposed outdoors, it is preferable that the casing 102 be stronger than the casing 2 of the cesium removal processing apparatus 1 shown in FIG.
In FIG. 3, the roof portion of the housing 102 is horizontal. However, in order to prevent water from being accumulated on the housing 102 and accumulation of snow due to rain or the like, an angle ( (For example, about 30 °), or by separately providing a roof with an angle with respect to the horizontal plane, it is preferable that the snow or the like piled up automatically falls. An example in which a roof is provided separately is shown in FIG. In the case of FIG. 4, snow and rainwater fall on the back side.

  In addition, the outdoor installation type as described above is easier to occupy than the indoor installation type, and the installation is also ready. A large-scale housing 102 can be prepared as necessary. Of course, it can also be made small for home use.

  Further, the humidifier 103 and the cesium removal filter 104 can be the same as those of the cesium removal processing apparatus 1 of FIG. Appropriate items such as size and number can be prepared each time according to the scale of the cesium removal processing apparatus 101. The disposition position is not particularly limited, and the humidifier 103 may be disposed outside the housing 102 as shown in FIG. 3 or may be disposed inside the housing 102.

  Furthermore, the louver 105, the dehumidifier 109, the drain pipe 110, the fan 111, the dust removing filter 112, and other necessary constituent members can be appropriately provided. For example, these can be the same as those of the cesium removal processing apparatus 1 of FIG. In addition, these numbers, arrangement | positioning positions, etc. can be determined suitably.

  For example, in FIG. 3, a duct extending upward is provided in the roof portion of the housing 102, and an air supply side flange portion 107 is formed in the duct, and is connected to an intake duct 108 of the building. And the dehumidifier 109 is arrange | positioned in the duct extended from this roof part.

As mentioned above, in the cesium removal processing apparatus of the present invention, the type that treats the outside air contaminated with cesium and incorporates clean air indoors has been described, but the present invention is not limited to these, and conversely, cesium It is also possible to use a type in which indoor gas contaminated with water is treated and released to the outside.
As the gas from the exhaust ducts of buildings, for example, exhaust gas from incinerators for treating cesium-contaminated rubble, etc., or gas inside facilities contaminated with cesium such as nuclear power plants And can handle them.

An example is shown in FIG.
Here, as shown in FIG. 5, an outdoor installation type cesium removal processing apparatus 201 will be described. However, even in the type in which such indoor gas is processed and released to the outside or the like, it is not limited to the one provided outdoors, and naturally it can be installed indoors.

The cesium removal processing apparatus 201 in FIG. 5 includes a housing 202, a humidifier 203, and a cesium removal filter 204.
The duct extending from the roof portion of the housing 202 is provided with a flange portion 214 on the gas intake side. The intake side flange portion 214 is connected to an exhaust duct 215 originally provided in a facility or the like. For this reason, the gas contaminated with indoor cesium can be sucked into the housing 202 from the flange portion 214 through the exhaust duct 215.

In addition, a cesium removal filter 204 is provided in the housing 202, and cesium in the gas humidified by the humidifier 203 can be removed.
And the discharge | release part is provided in the housing | casing 202 in the downstream of the cesium removal filter 204 with respect to the flow of gas, The gas by which the cesium removal process was carried out can be discharge | released from a discharge | release part.

The humidifier 203 and the cesium removal filter 204 can be the same as those of the cesium removal processing apparatuses 1 and 101 of FIGS.
Furthermore, the dehumidifier 209, the drain pipe 210, the fan 211, the dust removal filter 212, and other necessary constituent members can be appropriately provided. These may be the same as those of the cesium removal processing apparatuses 1 and 101 of FIGS. These numbers, arrangement positions, and the like can be determined as appropriate.

  With such a cesium removal processing apparatus 201, cesium can be efficiently removed from indoor gas, and clean air that is not contaminated with cesium can be released into the atmosphere or the like. Therefore, cesium does not diffuse into the atmosphere, not to mention the surroundings of the facility, etc., and people can be prevented from receiving radioactive contamination.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

For example, in FIGS. 1 to 5, a humidifier that sends steam into a humidifying chamber to humidify the outside air or exhaust gas is taken as an example, but the present invention is not limited to this, and as a result humidifies outside air or exhaust gas. It is sufficient if it has a function to perform.
An example is a scrubber. The scrubber removes dust and the like contained in a gas such as exhaust gas using water or the like. A pressurized water system that collects and removes dust, etc., by injecting high-pressure water into the gas from the nozzle, a stored water system that passes the gas through the stored water, and between the sprayed water There are a packed bed method in which gas is passed through, a rotating method in which gas is brought into contact with water dispersed by a rotating body, etc., and the gas is humidified by treatment with a scrubber.
In this invention, it can also be set as the thing of the aspect which removes a cesium with the cesium removal filter from the gas processed by the scrubber and humidified in this way.

1 ... Cesium removal processing apparatus of the present invention (indoor installation type, air supply from outdoor to indoor),
2, 102, 202 ... casing, 3, 103, 203 ... humidifier,
4, 104, 204 ... cesium removal filter, 5, 105 ... galleries,
6 ... Humidification room 7, 107 ... Flange on the air supply side,
8, 108 ... Building air intake ducts, 9, 109, 209 ... Dehumidifiers,
10, 10a, 10b, 110, 210 ... drain pipe,
11, 111, 211 ... fans,
12, 112, 212 ... dust removal filter, 13 ... inspection port,
101 ... Cesium removal treatment apparatus of the present invention (outdoor installation type, air supply from the outside to the inside),
201 ... Cesium removal treatment apparatus of the present invention (outdoor installation type, air supply from indoor to outdoor),
214 ... Flange on the intake side, 215 ... Exhaust duct for facilities, etc.

Claims (9)

An apparatus for removing cesium in a gas,
A cesium removal processing apparatus comprising a humidifier for humidifying a gas and a cesium removal filter for removing cesium in the gas humidified by the humidifier.   The cesium removal processing apparatus according to claim 1, wherein the humidifier humidifies a gas to a humidity of 50% or more.   The cesium removal processing apparatus further includes a drain pipe, and the drain pipe is for draining drain water from the gas from which cesium has been removed by the cesium removal filter. Item 3. The cesium removal treatment apparatus according to Item 2.   4. The cesium removal processing apparatus further includes a dehumidifier, and the dehumidifier dehumidifies the gas from which cesium has been removed by the cesium removal filter. The cesium removal processing apparatus according to one item.   The said cesium removal processing apparatus is further provided with the fan, This fan is for inhaling gas in an apparatus, The cesium removal as described in any one of Claims 1-4 characterized by the above-mentioned. Processing equipment.   The said cesium removal processing apparatus is further equipped with the dust removal filter for removing the dust in gas, The cesium removal processing apparatus as described in any one of Claims 1-5 characterized by the above-mentioned.   The cesium removal processing apparatus has a flange portion for connection on the air supply side, and the flange portion on the air supply side is connectable to an intake duct of a building, and removes cesium in the outside air. The cesium removal processing apparatus according to any one of claims 1 to 6, wherein the apparatus is capable of supplying air into a building.   The cesium removal treatment apparatus has a flange portion for connection on the intake side, and the flange portion on the intake side can be connected to an exhaust duct that emits gas contaminated with cesium, and cesium in exhaust gas. The cesium removal processing apparatus according to any one of claims 1 to 6, wherein the cesium removal processing apparatus is a processing for removing water.   The cesium removal processing apparatus further includes a housing, and the cesium removal filter is disposed in the housing, and the gas sucked into the housing is humidified by the humidifier and the cesium removal filter. The cesium removal processing apparatus according to any one of claims 1 to 8, wherein cesium is removed by the step.

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