JP2012002714A - Radioactive organic iodine removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radioactive organic iodine removing apparatus capable of increasing cleaning treatment volume in the air per unit time and capable of surely collecting and removing radioactive iodine in the air.SOLUTION: The radioactive organic iodine removing apparatus 10A has a radioactive organic iodine removing filter constituted by zigzag folding a sheet formed by active carbon fibers in one direction. In the radioactive organic iodine removing filter, a triethylenediamine C6H12N2 group for absorbing the radioactive organic iodine is stuck to the active carbon fibers, a face velocity in the radioactive organic iodine removing filter is in the range of 10-25 cm/sec, and the radioactive organic iodine removing efficiency of the radioactive organic iodine removing filter in 95% humidity in the air is 95% and more.

Description

  The present invention relates to a radioactive organic iodine removing apparatus that removes radioactive organic iodine contained in air.

  Organic adsorption to an activated carbon fiber sheet having a pore shape with a pore diameter of 3 to 30 nm of 0.15 cc / g or less and a pore volume of less than 3 nm and a pore volume of 0.50 cc / g or more There is a radioactive substance removal filter in which an effective amine is attached to the sheet and a protective sheet is laminated on one of the sheets (see Patent Document 1).

  Further, it is formed from a laminated sheet of two or more layers mainly composed of activated carbon fibers, and one or more layers of the laminated sheets are knitted fabric-like activated carbon fiber sheets, and the transmission rate coefficient of the laminated sheets is 0.02 to 0.02. There exists a radioactive substance removal filter which exists in the range of 0.2 cm / s / Pa (refer patent document 2). The transmission rate coefficient of the laminated sheet indicates the wind speed of air under a certain pressure loss.

  The radioactive substance removal filter disclosed in Patent Document 1 and Patent Document 2 is used for removing radioactive substances in the air in a nuclear facility or a medical institution that uses a radiation generator. These radioactive substance removal filters are housed in a filter case in a zigzag state so as to repeat undulations in one direction, and are detachably installed in the radioactive substance removal apparatus via the filter case. In the radioactive substance removing apparatus, air is forced to flow into the filter case by a blower, the air is purified through the radioactive substance removing filter, and the air is exhausted outside the apparatus.

JP 2004-205490 A JP 2006-112820 A

  When the surface speed of the radioactive substance removal filter disclosed in Patent Document 1 is increased, the radioactive substance removal performance may deteriorate, and the radioactive substance may not be reliably removed. On the other hand, when the surface speed is slowed, the amount of clean air per unit time decreases. Therefore, it is difficult for this filter to achieve both the reliable removal of radioactive substances and the improvement of the amount of clean air.

  The radioactive substance removing filter disclosed in Patent Document 2 has a transmission rate coefficient of 0.02 to 0.2 cm / s / Pa of the laminated sheet forming the filter, and the filter has a high surface speed, but the radioactive substance In some cases, the removal efficiency is not clear, the radioactive substance is not collected by the filter, and the radioactive substance cannot be reliably removed.

  An object of the present invention is to provide a radioactive iodine removing apparatus capable of increasing the amount of air to be cleaned per unit time and reliably collecting and removing radioactive iodine in the air.

  The premise of the present invention for solving the above-mentioned problems is that a radioactive organic iodine removal filter in which a sheet formed from activated carbon fibers is folded in one direction in a zigzag manner, and an radioactive organic iodine having an air inlet and an air outlet. A radioactive organic iodine removing device that includes a first filter case that accommodates a removal filter and a blower that forcibly flows air into the first filter case, and removes radioactive organic iodine contained in the air.

  The feature of the present invention based on the above premise is that amines that adsorb radioactive organic iodine are attached to activated carbon fibers, the surface speed of the radioactive organic iodine removing filter is in the range of 10 to 25 cm / sec, and the humidity of air is 95%. The radioactive organic iodine removal filter has a radioactive organic iodine removal efficiency of 95% or more.

  As an example of the present invention, the first filter case is formed of a pair of first outer frame members extending in parallel in one direction and a pair of second outer frame members extending in parallel in a direction intersecting with one direction. And the 1st reinforcement member which prevents a deformation | transformation of a radioactive organic iodine removal filter ranging over at least one of a 1st and 2nd outer frame member is attached to the air outlet side of a 1st filter case.

  As another example of the present invention, the sheet folded in a zigzag manner is positioned between the facing portions facing each other and at least at the center of the first outer frame member on the air inlet side of the first filter case. The 2nd reinforcement member extended toward the 1st reinforcement member from the inner side of the 1st bending part of a sheet | seat is attached.

  As another example of the present invention, in the radioactive organic iodine removing apparatus, when the area of the air inlet of the first filter case is constant, the amount of air flowing into the air inlet depends on the amount of air flowing into the air inlet. The dimension from the first bent portion of the sheet located on the side to the second bent portion of the sheet located on the air outlet side is determined.

  As another example of the present invention, the radioactive organic iodine removing device has a high air volume HEPA filter for removing dust contained in air, and a second filter having an air inlet and an air outlet and containing the HEPA filter. The HEPA filter is disposed on at least one of the upstream side and the downstream side of the radioactive organic iodine removal filter, and the blower forcibly causes air to flow into the air inlets of the first and second filter cases.

  As another example of the present invention, in the radioactive organic iodine removing apparatus, the HEPA filter is arranged at least one of the upper and lower directions of the radioactive organic iodine removing filter and the lower portion of the vertical direction, and an air flow path in which the air extends in the vertical direction. Through these filters, the filters are sequentially passed from a filter located in the lower part of the vertical direction to a filter located in the upper part of the vertical direction.

  As another example of the present invention, the air flow path is provided with a guide plate extending in the vertical direction for guiding air from the filter positioned below in the vertical direction to the entire area of the filter positioned above in the vertical direction.

  As another example of the present invention, a heater that heats air to a predetermined temperature is disposed upstream of the radioactive organic iodine removal filter.

  As another example of the present invention, the pressure loss of the radioactive organic iodine removing filter at a surface speed of 10 to 25 cm / sec is in the range of 100 to 300 Pa.

  As another example of the present invention, the amine is triethylenediamine C6H12N2, and the amount of triethylenediamine C6H12N2 added to the unit weight of the activated carbon fiber is in the range of 10 to 20% by weight.

As another example of the present invention, the average fiber diameter of activated carbon fibers is in the range of 10 to 18 μm, the basis weight of the sheet is in the range of 100 to 350 g / m ² , and the apparent bulk density of the sheet is 0.03 to 0. In the range of .13 g / cm ³ .

  As another example of the present invention, the thickness dimension of the sheet is in the range of 2 to 4 mm.

  As another example of the present invention, the radioactive organic iodine removal filter is made of one sheet, and the number of folding in one direction of the sheet is 16 to 18 with respect to the length of 100 mm in one direction of the radioactive iodine removal filter. Is in the range of times.

  As another example of the present invention, a radioactive organic iodine removal filter is made of two sheets stacked in the thickness direction, and the number of folding in one direction of the two sheets is one direction of the radioactive iodine removal filter. It is in the range of 8-9 times for a length of 100 mm.

  As another example of the present invention, the sheet has any form of a fiber nonwoven fabric, a woven fabric, and a knitted fabric.

  As another example of the present invention, the entire sheet is encapsulated in a water-repellent fiber nonwoven fabric or a hydrophobic fiber nonwoven fabric.

  According to the radioactive organic iodine removing apparatus of the present invention, amines that adsorb radioactive organic iodine are attached to the activated carbon fiber, and the surface speed of the radioactive organic iodine removing filter is in the range of 10 to 25 cm / sec. Since the filter's radioactive organic iodine removal efficiency at 95% humidity is 95% or more, it exhibits excellent radioactive organic iodine removal performance in high-humidity environment of air, and the filter has a high air passage speed and passes through the filter. Not only can the air flow rate be large and the amount of clean air per unit time in the device can be increased, but also the radioactive organic iodine contained in the air can be reliably collected and removed. It is possible to create clean air with the air removed. This radioactive organic iodine removal device can be used in nuclear facilities and medical facilities where radioactive organic iodine is likely to be generated, so that radioactive organic iodine generated from those facilities can be reliably removed, and the safety of those facilities is ensured. Sex can be secured.

  A first filter case is formed of a pair of first outer frame members and a pair of second outer frame members, and prevents deformation of the radioactive organic iodine removal filter across at least one of the first and second outer frame members. Even if a large amount of air flows into the air inlet of the first filter case per unit time, the radioactive organic iodine removing device in which one reinforcing member is attached to the air outlet of the first filter case Since the deformation of the radioactive organic iodine removing filter is prevented by the reinforcing member, it is possible to prevent a decrease in the performance of removing the radioactive organic iodine of the filter due to the deformation of the filter. This radioactive organic iodine removing apparatus has a high air passing speed through the radioactive organic iodine removing filter and a large flow rate of air passing through the filter, and can increase the amount of clean air per unit time in the apparatus. In addition, it has a radioactive organic iodine removal efficiency of 95% or more, so that radioactive iodine contained in air can be reliably collected and removed.

  A second reinforcing member extending from the inside of the first bent portion of the sheet located on the air inlet side of the first filter case toward the first reinforcing member is between the opposed portions of the sheet and is first. The radioactive organic iodine removing device attached to at least the central part of the outer frame member removes the radioactive organic iodine by the second reinforcing member even if a large amount of air flows into the air inlet of the first filter case per unit time. Since the filter is prevented from being deformed, it is possible to prevent a decrease in the performance of removing the radioactive organic iodine of the filter due to the deformation of the filter. This radioactive organic iodine removing apparatus has a high air passing speed through the radioactive organic iodine removing filter and a large flow rate of air passing through the filter, and can increase the amount of clean air per unit time in the apparatus. In addition, it has a radioactive organic iodine removal efficiency of 95% or more, so that radioactive iodine contained in air can be reliably collected and removed.

  If the area of the air inlet of the first filter case containing the radioactive organic iodine removal filter is fixed and there is no change in the area, the air flow of the sheet folded zigzag depending on the amount of air flowing into the air inlet The radioactive organic iodine removing apparatus, in which the dimension from the first bent part located on the inlet side to the second bent part located on the air outlet side is determined, makes the area of the air inlet of the first filter case constant. While maintaining the size of the seat from the first bent portion to the second bent portion can be determined by the amount of air flowing in from the air inlet, while maintaining the area of the air inlet to the standard, Within that standard, the air volume in the radioactive organic iodine removal filter can be freely selected, and the amount of air to be cleaned per unit time can be freely determined.

  The radioactive organic iodine removing device in which the HEPA filter is disposed on at least one of the upstream side and the downstream side of the radioactive organic iodine removing filter has a high air volume HEPA filter that removes dust contained in the air upstream of the radioactive organic iodine removing filter. When it is arranged on the side, dust in the air is removed by the HEPA filter, so that the dust does not reach the radioactive organic iodine removal filter, and the radioactive organic iodine of the filter by the dust accumulating on the radioactive organic iodine removal filter Reduction in removal performance can be prevented. This radioactive organic iodine removal device can remove dust in the air, and can reliably collect and remove radioactive organic iodine contained in the air, and clean air from which dust and radioactive organic iodine have been removed. Can be made. When a high air volume HEPA filter that removes dust contained in the air is arranged downstream of the radioactive organic iodine removal filter, even if dust is released from the radioactive organic iodine removal filter, the dust is removed by the HEPA filter. Therefore, the dust emitted from the radioactive organic iodine removal filter can be reliably removed. This radioactive organic iodine removing device can reliably collect and remove radioactive organic iodine contained in the air, and can also remove dust released from the radioactive organic iodine removing filter. It is possible to create clean air with the air removed. In the radioactive organic iodine removing apparatus, since the HEPA filter has a large air volume, the surface speed of the radioactive organic iodine removing filter is not lowered by the HEPA filter, and the air passage speed in the filter can be increased, and the unit time It is possible to increase the amount of clean air processing per hit. The radioactive organic iodine removal device is not only capable of increasing the flow rate of air passing through the radioactive organic iodine removal filter and increasing the flow rate of air passing through the filter, and increasing the amount of clean air per unit time. The radioactive organic iodine contained in the air can be reliably collected and removed.

  The HEPA filter is disposed on at least one of the upper and lower sides of the radioactive organic iodine removal filter and the lower and upper sides of the radioactive organic iodine removal filter. In the radioactive organic iodine removing device that flows, when a high air volume HEPA filter that removes dust contained in air is arranged below the radioactive organic iodine removing filter, dust in the air is removed by the HEPA filter. Therefore, the dust does not reach the radioactive organic iodine removal filter, and the reduction of the radioactive organic iodine removal performance of the filter due to the dust accumulating on the radioactive organic iodine removal filter can be prevented. This radioactive organic iodine removal device can remove dust in the air, and can reliably collect and remove radioactive organic iodine contained in the air, and clean air from which dust and radioactive organic iodine have been removed. Can be made. When a high air volume HEPA filter that removes dust contained in the air is placed above and below the radioactive organic iodine removal filter, even if dust is released from the radioactive organic iodine removal filter, the dust is removed by the HEPA filter. Therefore, the dust emitted from the radioactive organic iodine removing filter can be surely removed. This radioactive organic iodine removing device can reliably collect and remove radioactive organic iodine contained in the air, and can also remove dust emitted from the radioactive organic iodine removing filter. It is possible to create clean air with the air removed. In the radioactive organic iodine removing apparatus, since the HEPA filter has a large air volume, the surface speed of the radioactive organic iodine removing filter is not lowered by the HEPA filter, and the air passage speed in the filter can be increased, and the unit time It is possible to increase the amount of clean air processing per hit. In the radioactive organic iodine removing device, since the radioactive organic iodine removing filter and the HEPA filter are arranged in the vertical direction, the size in the longitudinal direction of the device can be reduced compared with the case where the filters are arranged in the longitudinal direction. It can be made compact. The radioactive organic iodine removal device is not only capable of increasing the flow rate of air passing through the radioactive organic iodine removal filter and increasing the flow rate of air passing through the filter, and increasing the amount of clean air per unit time. The radioactive organic iodine contained in the air can be reliably collected and removed.

  The radioactive organic iodine removing device in which the guide plate extending in the vertical direction for guiding the air from the filter located in the lower vertical direction to the entire area of the filter located in the upper vertical direction is installed in the air flow path. The filter does not flow in a biased manner, and the entire area of the filter can be used for air purification, and the air can be efficiently cleaned within a unit time.

  The radioactive organic iodine removing device in which the heater for heating the air at a predetermined temperature is arranged upstream of the radioactive organic iodine removing filter evaporates the moisture contained in the air by heating the air to the predetermined temperature by the heater. Moreover, the fall of the radioactive organic iodine removal efficiency of the radioactive organic iodine removal filter by moisture is contained in air can be prevented. If this radioactive organic iodine removal device can only increase the amount of air purification through the radioactive organic iodine removal filter, the flow rate of air passing through the filter is high, the flow rate of air passing through the filter is large, and the amount of clean air per unit time can be increased. Therefore, 95% or more of the radioactive organic iodine removal efficiency can be maintained, and radioactive iodine contained in the air can be reliably collected and removed.

  The radioactive organic iodine removal device in which the pressure loss of the radioactive organic iodine removal filter at a surface speed of 10 to 25 cm / sec is in the range of 100 to 300 Pa has a low pressure loss of the filter for a predetermined surface speed and passes through the radioactive organic iodine removal filter. Since the air passing speed is high and the flow rate of the air passing through the filter is large, the amount of air cleaning processing per unit time in the apparatus can be increased. This radioactive organic iodine removal device has a high passage speed of air passing through the radioactive organic iodine removal filter and has a radioactive organic iodine removal efficiency of 95% or more despite a large flow rate of air passing through the filter. In addition, radioactive organic iodine contained in the air can be reliably collected and removed.

  The radioactive organic iodine removing device in which the amine is triethylenediamine C6H12N2 and the amount of triethylenediamine C6H12N2 attached to the unit weight of the activated carbon fiber is in the range of 10 to 20% by weight is a high adsorption of radioactive organic iodine among the amines. By using the triethylenediamine C6H12N2 having a function, radioactive organic iodine is instantaneously adsorbed to the triethylenediamine C6H12N2, and thus the radioactive organic iodine contained in the air can be reliably collected and removed. In this radioactive organic iodine removing apparatus, triethylenediamine C6H12N2 does not release the radioactive organic iodine once adsorbed, and it is possible to reliably prevent re-scattering of the collected radioactive organic iodine from the apparatus.

A radioactive organic fiber in which the average fiber diameter of activated carbon fibers is in the range of 10 to 18 μm, the basis weight of the sheet is in the range of 100 to 350 g / m ² , and the apparent bulk density is in the range of 0.03 to 0.13 g / cm ³ The iodine removal device can reduce the overall size of the radioactive organic iodine removal filter in which the sheet is folded zigzag in one direction, and can reduce the weight of the filter per unit volume. Can be made compact. Although this radioactive organic iodine removal device can be made compact, it can increase the amount of clean air per unit time and reliably capture radioactive organic iodine contained in the air. Can be collected and removed.

  The radioactive organic iodine removing apparatus having a sheet thickness dimension in the range of 2 to 4 mm can reduce the overall size of the radioactive organic iodine removing filter in which the sheet is folded in one direction in a zigzag manner, and the filter per unit volume. The weight of the apparatus can be reduced, and accordingly, the apparatus itself can be made compact. Although this radioactive organic iodine removal filter can be made compact, it can increase the amount of clean air per unit time and reliably capture radioactive organic iodine contained in the air. Can be collected and removed.

  The radioactive organic iodine removing filter is made of one sheet, and the number of times the sheet is bent in one direction is 16 to 18 times with respect to the length of 100 mm in one direction of the filter. When the number of bendings is in the above range, the surface speed of the radioactive organic iodine removal filter can be increased, the amount of air cleaning per unit time in the apparatus can be increased, and the specific surface area of the filter is ensured. And the high collection performance of radioactive organic iodine in the apparatus can be maintained. If this radioactive organic iodine removal device can only increase the amount of air purification through the radioactive organic iodine removal filter, the flow rate of air passing through the filter is high, the flow rate of air passing through the filter is large, and the amount of clean air per unit time can be increased. In addition, radioactive organic iodine contained in the air can be reliably collected and removed.

  The radioactive organic iodine removal filter is made of two sheets stacked in the thickness direction, and the number of times the two sheets are folded in one direction is in the range of 8-9 times with respect to the length of 100 mm in one direction of the filter. A certain radioactive organic iodine removing device can increase the collection performance of radioactive organic iodine because the specific surface area of the filter is increased compared to the case where the radioactive organic iodine removing filter is made of one sheet. . The radioactive organic iodine removing device can increase the surface speed of the radioactive organic iodine removing filter by increasing the number of bendings within the above range, and can increase the amount of air cleaning treatment per unit time in the device. The specific surface area of the filter can be ensured, and the high collection performance of radioactive organic iodine in the apparatus can be maintained. If this radioactive organic iodine removal device can only increase the amount of air purification through the radioactive organic iodine removal filter, the flow rate of air passing through the filter is high, the flow rate of air passing through the filter is large, and the amount of clean air per unit time can be increased. In addition, radioactive organic iodine contained in the air can be reliably collected and removed.

  The radioactive organic iodine removing device in which the sheet formed from the activated carbon fiber has any form of fiber nonwoven fabric, woven fabric, and knitted fabric, the air permeability and processing of the radioactive organic iodine removing filter when the sheet has the form of nonwoven fabric As a result, the adsorption rate of radioactive organic iodine in the filter can be increased, and the removal rate of radioactive organic iodine in the apparatus can be increased. Further, when the sheet has a woven or knitted form, the air permeability and processability of the radioactive organic iodine removing filter are improved, the strength and flexibility of the filter are high, and the operability of the filter in the apparatus can be improved. . If this radioactive organic iodine removal device can only increase the amount of air purification through the radioactive organic iodine removal filter, the flow rate of air passing through the filter is high, the flow rate of air passing through the filter is large, and the amount of clean air per unit time can be increased. In addition, radioactive organic iodine contained in the air can be reliably collected and removed.

  The radioactive organic iodine removal device in which the entire sheet is encapsulated in a water-repellent fiber nonwoven fabric or a hydrophobic fiber nonwoven fabric does not allow moisture to reach the radioactive organic iodine removal filter by the water-repellent fiber nonwoven fabric or hydrophobic fiber nonwoven fabric. A decrease in the performance of removing the radioactive organic iodine of the filter due to getting wet with water can be prevented, and a decrease in the performance of removing the radioactive organic iodine in the apparatus can be prevented. If this radioactive organic iodine removal device can only increase the amount of air purification through the radioactive organic iodine removal filter, the flow rate of air passing through the filter is high, the flow rate of air passing through the filter is large, and the amount of clean air per unit time can be increased. In addition, radioactive iodine contained in the air can be reliably collected and removed.

The perspective view of the radioactive organic iodine removal apparatus shown as an example. The front view of a radioactive organic iodine removal apparatus. The rear view of a radioactive organic iodine removal apparatus. The side view of a radioactive organic iodine removal apparatus. The side view of a radioactive organic iodine removal apparatus. The perspective view of a 1st filter case. The front view of the 1st filter case of FIG. The rear view of the 1st filter case of FIG. FIG. 7 is a cross-sectional view taken along line X1-X1 in FIG. The elements on larger scale of FIG. The side view of the 1st filter case which fractures | ruptures and shows a part of vertical board member. The elements on larger scale of a filter. The elements on larger scale of a lamination sheet. The rear view of the filter case which installed the 1st reinforcement member shown as an example. The figure which shows the test apparatus of radioactive organic iodine removal efficiency. The front view of the filter case which accommodated the filter shown as another example. FIG. 16 is a cross-sectional view taken along line X2-X2 in FIG. The elements on larger scale of a sheet | seat. Schematic which shows the change state of the filter in a pressure | voltage resistant test. The schematic side view of the radioactive organic iodine removal apparatus which shows the flow of air. The rear view of the radioactive organic iodine removal apparatus shown as another example. The schematic side view of the radioactive organic iodine removal apparatus of FIG. 21 which shows the flow of air. The perspective view of the 2nd filter case which accommodated the HEPA filter. The rear view of the radioactive organic iodine removal apparatus shown as another example. The schematic side view of the radioactive organic iodine removal apparatus of FIG. 24 which shows the flow of air.

  The details of the radioactive organic iodine removing apparatus according to the present invention will be described with reference to the accompanying drawings such as FIG. 1 which is a perspective view of the radioactive organic iodine removing apparatus shown as an example. 2 is a front view of the radioactive organic iodine removing device 10A, and FIG. 3 is a rear view of the radioactive organic iodine removing device 10A. 4 is a side view of the radioactive organic iodine removing device 10A shown from the control box 17 side, and FIG. 5 is a side view of the radioactive organic iodine removing device 10A shown from the fan 16 side. FIG. 3 shows a state in which the rear hatch 31 is opened, and the first filter case 14 is accommodated in the accommodation space 30. In FIG. 1, the vertical direction is indicated by arrow A, the horizontal direction is indicated by arrow B, and the front-rear direction is indicated by arrow C.

  The radioactive organic iodine removing device 10A is installed in a nuclear facility or medical facility where radioactive organic iodine may be generated, and is used for removing radioactive organic iodine contained in the air of those facilities. Nuclear power facilities include nuclear power plants, intermediate storage facilities, reprocessing plants, MOX fuel plants, fast breeder reactors, fast breeder reactor fuel factories, fast breeder reactor reprocessing plants, and high-level radioactive waste final disposal. There are facilities. The radioactive organic iodine removing device 10A includes a gantry 11, a housing 12 assembled on the gantry 11, a radioactive organic iodine removing filter 13 and a first filter case 14, an air heating heater 15 (heater), and a fan 16. (Blower) and a control box 17.

  The gantry 11 is made of a metal column such as iron, aluminum, or alloy, and is molded into a quadrangle formed by joining the metal columns. A caster 18 for moving the apparatus 10 </ b> A is attached to the gantry 11. The housing 12 is formed of a front housing 19 and a rear housing 20 and an exhaust duct 21. In the housing 12, the front housing 19, the rear housing 20, and the exhaust duct 21 are arranged in this order from the upstream side to the downstream side. The front housing 19, the rear housing 20, and the exhaust duct 21 are made of metal such as iron, aluminum, and alloy.

  The front housing 19 is molded into a hollow prismatic shape that is long in the front-rear direction, and is installed in front of the gantry 11 in the front-rear direction. The front end portion 22 of the front housing 19 has an intake port 23 for taking in the air before cleaning. Inside the front housing 19, an air flow path 24 through which air flowing in from the air inlet 23 flows is formed. The shape and size of the front housing 19 are not particularly limited, and the shape and size can be freely changed.

  The heater 15 is attached to the central portion 25 of the front housing 19. The heater 15 includes a prismatic casing 26, a heater element (not shown) installed inside the casing 26, and a temperature sensor (not shown). A heating element that generates heat by electricity is accommodated inside the heater element. The heater 15 heats air passing through the heater 15 to a predetermined temperature by the heater element. The temperature sensor is attached to the air outlet of the heater 15 and is connected to the control box 17 via an interface (not shown). The temperature sensor measures the temperature of the air heated by the heater 15 and outputs the measured temperature to the control box 17.

  The rear housing 20 is molded into a hollow, substantially prismatic shape that is long in the vertical direction, and is disposed behind the front housing 19 in the front-rear direction. The rear housing 20 has a front end portion 27 hermetically connected to a rear end portion 28 of the front housing 19 via a packing (not shown). Inside the rear housing 20, an air flow path 29 through which air flowing in from the front housing 19 flows and a storage space 30 for storing the first filter case 14 are formed. The accommodation space 30 is provided with a filter support guide (not shown) for detachably fixing the first filter case 14 therein. A rear hatch 31 that can open and close the accommodation space 30 is attached to the rear housing 20. The shape and size of the rear housing 20 are not particularly limited, and the shape and size can be freely changed. The first filter case 14 that houses the radioactive organic iodine removing filter 13 is supported by a filter support guide and is fixed to the housing space 30.

  The rear hatch 31 is attached to the rear housing 20 via a hinge 71. With the hinge 71 as the turning center, the rear hatch 31 can be turned backward in the front-rear direction indicated by an arrow to open the hatch 31 and open the accommodation space 30. Conversely, with the hinge 71 as the turning center, the rear hatch 31 can be turned forward in the front-rear direction indicated by the arrow to close the hatch 31 and close the accommodation space 30. When the rear hatch 31 is closed, the rear hatch 31 and the rear housing 20 are in airtight contact. After the rear hatch 31 is closed, the hatch 31 and the rear housing 20 are airtightly connected by the fixing means. As an example of the fixing means, a screw is inserted into a through hole formed in the flange extending to the peripheral edge of the rear housing 20 and a through hole formed in the flange extending to the peripheral edge of the rear hatch 31, and a nut is fitted to the screw. And tighten the flanges.

  The front end 32 of the exhaust duct 21 is airtightly connected to the rear end 33 of the rear housing 20 via a packing (not shown). At the rear end portion 34 of the exhaust duct 21, an air supply port 35 for supplying clean air is opened. A fan 16 (blower) is attached to the central portion 36 of the exhaust duct 21. Inside the exhaust duct 21, an air flow path 37 through which air flowing in from the rear housing 20 flows is formed. The fan 16 is connected to the control box 17 via an interface (not shown).

  The control box 17 is a microcomputer to which a numeric keypad unit, a display, and a switch (not shown) are attached. The control box 17 maintains the temperature of the heater 15 at a set temperature, and the rotation speed (output) of the fan 16 is set. Hold on. When the temperature of the heater 15 and the rotation speed of the fan 16 are input via the input keys of the numeric keypad unit, the control box 17 operates the heater 15 at the input temperature and operates the fan 16 at the input rotation speed. . The control box 17 compares the measured temperature output from the temperature sensor with the set temperature, and adjusts the temperature of the heater 15 so that the measured temperature becomes the set temperature.

  FIG. 6 is a perspective view of the first filter case 14 containing the radioactive organic iodine removal filter 13A shown as an example, and FIG. 7 is a front view of the filter case 14 of FIG. 8 is a rear view of the filter case 14 of FIG. 6, and FIG. 9 is a cross-sectional view taken along line X1-X1 of FIG. FIG. 10 is a partially enlarged view of FIG. 9, and FIG. 11 is a side view of the filter case 14 shown with a part of the vertical plate member 45 (second outer frame member) cut away. FIG. 12 is a partially enlarged view of the radioactive organic iodine removing filter 13 </ b> A, and FIG. 13 is a partially enlarged view of the laminated sheet 39. 6 to 8, the vertical direction is indicated by an arrow A, the horizontal direction is indicated by an arrow B, and the front-rear direction is indicated by an arrow C (only in FIG. 6). In FIG. 11, an air flow in the filter is indicated by an arrow S. In FIG. 13, the illustration of the separator 42 is omitted.

  As shown in FIG. 13, the radioactive organic iodine removing filter 13A used in the radioactive organic iodine removing device 10A is a sheet 38 formed from activated carbon fibers, and the two sheets 38A and 38B are moved in the thickness direction. It is made from a laminated sheet 39 that is overlapped. In the filter 10 </ b> A, as shown in FIG. 9, the laminated sheet 39 is folded in a zigzag (bellows shape) so as to repeat the undulation in the lateral direction (one direction). The filter 10 </ b> A is detachably accommodated inside the first filter case 14 in a state of being folded zigzag in the lateral direction.

  The sheet 38 has any form of a fiber nonwoven fabric, a woven fabric, and a knitted fabric, and the entire sheet 38 is covered with a water-repellent fiber nonwoven fabric 40 or a hydrophobic fiber nonwoven fabric 40 that has been subjected to a water-repellent treatment. Yes. In the laminated sheet 39, one in the form of a fiber nonwoven fabric is used for one sheet 38A, and that in the form of a woven or knitted fabric is used for the other sheet 38B. However, in the laminated sheet 39, one and the other sheets 38A, 38B may be used in the form of a fiber nonwoven fabric, and one and the other sheets 38A, 38B are used in the form of a woven or knitted fabric. May be. Note that the laminated sheet 39 is not limited to the two sheets 38A and 38B overlapped, and a stack of three or more sheets 38 may be used.

  Between the facing portions 41 of the laminated sheet 39 that are folded in a zigzag manner, separators 42 that form an arc so as to repeat undulations in the vertical direction are arranged, and a predetermined gap 43 is formed by the separators 42. ing. The separator 42 is made of a metal such as aluminum or stainless steel, but may be made of a synthetic resin. The activated carbon fiber is produced by firing and carbonizing an organic fiber, and further performing a heat treatment at a high temperature. Cellulose type, acrylic type, phenol type, and pitch type can be used for the activated carbon fiber. The activated carbon fiber is formed with a plurality of micropores extending in the thickness direction from the surface thereof.

  The activated carbon fiber is attached with triethylenediamine C6H12N2 (amines) that adsorbs radioactive organic iodine. The amount of triethylenediamine C6H12N2 attached to the unit weight of the activated carbon fiber is in the range of 10 to 20% by weight, preferably in the range of 12 to 18% by weight, and more preferably in the range of 13 to 16% by weight. In the laminated sheet 39, the radioactive organic iodine is collected in the micropores of the activated carbon fiber, and the radioactive organic iodine is adsorbed on the triethylenediamine C6H12N2 attached to the activated carbon fiber.

  If the amount of triethylenediamine C6H12N2 attached is less than 10% by weight, triethylenediamine C6H12N2 may not be attached to the entire area of the activated carbon fiber, and the radioactive organic iodine is sufficiently adsorbed to the activated carbon fiber via the triethylenediamine C6H12N2. In some cases, the removal performance of radioactive organic iodine in the filter 13A becomes insufficient. When the addition amount of triethylenediamine C6H12N2 exceeds 20% by weight, triethylenediamine C6H12N2 may block the micropores of the activated carbon fiber, and the radioactive organic iodine may not be collected in the micropores.

  Triethylenediamine C6H12N2 is used as the amine. In addition to triethylenediamine C6H12N2, 1,4-diaza-2,2,2-picyclooctane, N, N′-bis- (3-amino Propyl) -piperazine, N, N-dimethyl-aminoethyl methacrylate, N, N-dimethylaminopropylamine, 3-aminopropyltrimethoxysilane, 1,5-diazabicycloundecene, poly-tert-butylaminoethyl Methacrylate, polyethyleneimine, 1,5-diazapicyclo [4,3,0] non-5-ene, 1,5-diazapicyclo [5,4,0] unde-7-5-ene, 2-methyl-1,4- Diazapicyclo [2,2,2] octane, phenylhydrazine, 2-cyanopyridine, diisopropylamine, Trimethyl aminoethyl piperazine, hexamethylene tetramine, may be used methyl pyromellitic ethyleneimine, one type of amine or amines obtained by mixing several kinds of them among the polyalkyl polyamine.

  The first filter case 14 is made of plywood, and its front shape is formed into a quadrangle. The filter case 14 may be made of metal (iron plate, aluminum plate, stainless steel plate, etc.) or synthetic resin in addition to the plywood. The filter case 14 includes a pair of horizontal plate members 44 (first outer frame members) that are spaced apart from each other in the vertical direction and extend in the horizontal direction, and a planar rectangular shape that extends in the vertical direction while being spaced apart from each other in the horizontal direction. It is made of a pair of vertical plate members 45 (second outer frame members). A stop plate member 46 extending in the lateral direction is attached to the horizontal plate member 44.

  In the first filter case 14, the end of the horizontal plate member 44 and the end of the vertical plate member 45 are fixed via fixing means (screws, adhesive, etc.). The filter case 14 has an air inlet 47 defined on the front side thereof and an air outlet 48 defined on the rear side thereof. The first bent portion 49 of the laminated sheet 39 folded zigzag is positioned on the air inlet 47 side of the filter case 14, and the zigzag folded on the air outlet 48 side of the filter case 14. The second bent portion 50 of the laminated sheet 39 is located. The separator 42 extends from the inner side of the first bent portion 49 toward the second bent portion 50 between the opposed portions 41 of the laminated sheet 39, and the second bent portion between the opposed portions 41. 50 extends from the inside toward the first bent portion 49.

  First to third reinforcing members 51 to 53 that prevent deformation of the filter 13A are attached to the first filter case 14. The first reinforcing member 51 is a long and narrow prismatic plywood. As shown in FIG. 8, the two reinforcing members 51 are arranged on the air outlet 48 side of the filter case 14. The first reinforcing members 51 are positioned between the horizontal plate members 44 and extend in the horizontal direction with a predetermined distance in the vertical direction. These first reinforcing members 51 have their lateral ends fixed to the vertical plate member 45 via fixing means (such as screws or adhesives). Three or more first reinforcing members 51 may be attached to the filter case 14.

  The second reinforcing member 52 is a plywood having a planar shape that is long in the vertical direction. As shown in FIG. 10, the second reinforcing member 52 is disposed between the opposed portions 41 of the laminated sheet 39 that are folded in a zigzag manner. It is arranged at the center of the. The second reinforcing member 52 extends from the inside of the first bent portion 49 of the laminated sheet 39 located on the air inlet 47 side toward the first reinforcing member 51. Both ends of the second reinforcing member 52 in the vertical direction are fixed to the horizontal plate member 44 via fixing means (such as screws or adhesives). Two or more second reinforcing members 52 may be attached to the first filter case 14.

  The third reinforcing member 53 is a long and narrow prismatic plywood, and is disposed on the air inlet 47 side of the first filter case 14 as shown in FIG. It extends. Both ends of the third reinforcing member 53 in the horizontal direction are fixed to the vertical plate member 45 via fixing means (such as screws or adhesives). Two or more third reinforcing members 53 may be attached to the first filter case 14. The first to third reinforcing members 51 to 53 may be made of metal (iron plate, aluminum plate, stainless steel plate, etc.) or synthetic resin in addition to the plywood.

As an example of the longitudinal and lateral lengths L1 and L2 and the longitudinal length L3 of the first filter case 14, the longitudinal length L1 is 610 mm, and the lateral length L2 is 610 mm. The length dimension L3 in the front-rear direction is 140 mm. The filter case 14 has a longitudinal and lateral length dimension L1, L2 (standardized area of the air inlet 47 (air outlet 48): 610 × 610), and the air volume of air flowing from the air inlet 47 is 28. In the range of ˜32 m ³ / min, the length dimension L3 in the front-rear direction is determined to be 140 mm. In other words, the length dimension L4 from the first bent portion 49 located on the air inlet 47 side of the laminated sheet 39 folded zigzag to the second bent portion 50 located on the air outlet 48 side. (See FIG. 10) is determined to be 110 to 130 mm.

In addition, as another example of the longitudinal and lateral lengths L1 and L2 and the longitudinal length L3 of the first filter case 14, the longitudinal length L1 is 610 mm, and the lateral length L2 is It is 610 mm, and the length dimension L3 in the front-rear direction is 294 mm. The filter case 14 has a longitudinal and lateral lengths L1 and L2 (standardized area of the air inlet 47 (air outlet 48): 610 × 610), and the amount of air flowing from the air inlet 47 is 40. In the range of ˜60 m ³ / min, the length dimension L3 in the front-rear direction is determined to be 294 mm. In other words, the dimension L4 from the first bent portion 49 located on the air inlet 47 side of the laminated sheet 39 folded zigzag to the second bent portion 50 located on the air outlet 48 side is 264. It is determined to be ~ 284mm.

  Therefore, in the filter 13A, when the area of the air inlet 47 (air outlet 48) of the first filter case 14 is constant, the laminated sheet 39 folded zigzag by the amount of air flowing into the air inlet 47. The length dimension L4 from the first bent portion 49 located on the air inlet 47 side to the second bent portion 50 located on the air outlet 48 side is determined. The filter 13 </ b> A maintains the area of the air inlet 47 of the filter case 14 at a constant level, and the first bent portion 49 to the second bent portion 50 of the seat 39 according to the amount of air flowing from the air inlet 47. Length L4 can be determined, and the air volume in the filter 13A can be freely selected within the standard while maintaining the area of the air inlet 47 to that of the standard, and the air per unit time can be cleaned. The amount of processing can be determined freely.

  FIG. 14 is a rear view of the filter case 14 provided with a first reinforcing member 51 shown as an example. This filter case 14 is different from that of FIG. 1 in that a bracing structure is adopted as the first reinforcing member 51, and the other configurations are the same as those of the filter case 14 of FIG. The first reinforcing member 51 is an elongated prismatic plywood, and two of them are arranged on the air outlet 48 side of the first filter case 14. The first reinforcing members 51 extend from one corner of the filter case 14 where the horizontal plate member 44 and the vertical plate member 45 intersect to the other corner. These first reinforcing members 51 are fixed to the corners of the filter case 14 at both ends by fixing means (such as screws or adhesives).

  FIG. 15 is a diagram showing a test apparatus 54 for removing radioactive organic iodine. In the radioactive organic iodine removal filter 13A, the surface speed is in the range of 10 to 25 cm / sec, preferably in the range of 15 to 20 cm / sec, and the radioactive organic iodine removal efficiency at 95% air humidity is preferably 95% or more. Is 97% or more, more preferably 99.999% or more. If the surface speed is less than 10 cm / sec, the amount of air cleaning treatment per unit time cannot be increased. If the surface speed exceeds 25 cm / sec, the speed of the air passing through the filter 13A may be too high and the filter 13A may not be able to collect radioactive organic iodine. If the removal efficiency of radioactive organic iodine at 95% humidity of air is less than 95%, the radioactive organic iodine contained in the air may not be reliably removed.

  The radioactive organic iodine removal efficiency in the filter 13A was determined based on the measurement result using the test apparatus 54 of FIG. The test device 54 includes a cylinder 55, a gas flow meter 56, a photoacoustic gas monitor 57 (gas concentration measuring device), a filter cartridge 58, an air flow meter 59, and an intake pump 60. The cylinder 55, gas flow meter 56, photoacoustic gas monitor 57, filter cartridge 58, air flow meter 59, and intake pump 60 are connected via a pipeline 61. A bypass line 62 is connected to the upstream line 60 and the downstream line 60 of the filter cartridge 58. Note that a switching valve (not shown) that switches between the inflow of air into the filter cartridge 58 and the inflow of air into the bypass conduit 62 is installed in the conduit 60.

The cylinder 55 contains methyl iodide gas supplied to the pipe 61. A test filter 63 is detachably fixed to the filter cartridge 58. The photoacoustic gas monitor 57 is connected to the pipe line 60 on the upstream side and the pipe line 60 on the downstream side of the filter cartridge 58. The photoacoustic gas monitor 57 continuously measures the concentration of methyl iodide contained in the air flowing through the pipe line 60. The specifications of the test filter 63 are as follows: the amount of triethylenediamine C6H12N2 is 15.9% by weight, the basis weight is 209 g / m ² , the thickness is 3 m, the specific surface area is 1400 to 1450, and the weight is 0.38 g.

  The test procedure is as follows. The test filter 63 is fixed to the filter cartridge 58, the intake pump 60 and the photoacoustic gas monitor 57 are operated, the measured value of the air flow meter 59 is confirmed, and a predetermined flow rate (surface speed (10 to 25 cm / sec) is flowed. The flow rate when converted to) was passed through the pipe 60 and the change in the dew point of the pipe 60 extending downstream of the filter cartridge 58 was monitored. When the dew point measurement value was a set value (air humidity 95%), the flow of air into the filter cartridge 58 was stopped via the switching valve, and a constant flow rate of air was passed through the bypass line 62. Next, while confirming the measurement value of the gas flow meter 56, a certain amount of methyl iodide gas is supplied from the cylinder 55 to the pipe line 60, and the concentration of methyl iodide gas contained in the air is constant through the photoacoustic gas monitor 57. It was confirmed that the concentration was.

  When the concentration of methyl iodide gas is a constant concentration, the flow of air into the bypass conduit 62 is stopped via the switching valve, a constant flow of air is allowed to flow through the filter cartridge 58, and the iodine gas is passed through the photoacoustic gas monitor 57. The concentration of methyl fluoride gas was measured continuously. Using the photoacoustic gas monitor 57, air is sampled from the upstream line 60 of the filter cartridge 58 to measure the concentration of methyl iodide contained in the air, and from the downstream line 60 of the filter cartridge 58. Air was sampled and the concentration of methyl iodide contained in the air was measured.

  The concentration measurement of methyl iodide gas was continued until the concentration measurement value on the downstream side of the filter cartridge 58 reached 1/3 of the concentration measurement value on the upstream side of the cartridge 58. The methyl iodide removal efficiency (radioactive organic iodine removal efficiency) was calculated by the following formula. η = (C1-C2) / C1 × 100, where η is methyl iodide removal efficiency (radioactive organic iodine removal efficiency) (%), C1 is the concentration of methyl iodide contained in the air upstream of the cartridge 58 (Ppm), C2 is the concentration (ppm) of methyl iodide contained in the air on the downstream side of the cartridge 58. As a test result, methyl iodide removal efficiency (radioactive organic iodine removal efficiency) was 99% or more. The test filter 63 showed a methyl iodide removal efficiency (radioactive organic iodine removal efficiency) of 99% or more, but the filter 13A calculated from that showed 95% or more as the minimum efficiency, and 99.999. % Or more is the maximum efficiency.

  In the radioactive organic iodine removing filter 13A, the number of times of bending in the lateral direction (one direction) of the laminated sheet 39 obtained by superposing two sheets 38 is in the range of 8 to 9 times with respect to the length of 100 mm in one direction of the filter 13A. It is in. If the number of times of bending is less than 8, the adsorption area necessary for the filter 13A cannot be ensured, and the collection performance of radioactive organic iodine may deteriorate. If the number of times of folding exceeds 9, the laminated sheets 39 overlap closely, the surface speed of the filter 13A decreases, and the amount of air cleaning treatment per unit time cannot be increased. Since the number of times the laminated sheet 39 is bent in the lateral direction is within the above range, the surface speed of the filter 13A can be increased, the amount of air cleaning per unit time can be increased, and the filter 13A is necessary. A large adsorption area can be secured, and high collection performance of radioactive organic iodine can be maintained.

  16 is a front view of a filter case 14 that houses a radioactive organic iodine removal filter 13B shown as another example, and FIG. 17 is a cross-sectional view taken along line X2-X2 in FIG. FIG. 18 is a partially enlarged view of the sheet 38. 16 and 17, the vertical direction is indicated by an arrow A (only in FIG. 16), the horizontal direction is indicated by an arrow B, and the front-rear direction is indicated by an arrow C (only in FIG. 17). This filter 13B is different from that in FIG. 6 in that the filter 13B is formed by folding one sheet 38 in a lateral direction (one direction) in a zigzag manner, and the other configuration is that of the filter 13A in FIG. Since they are the same as those, the same reference numerals as those in FIG. 6 are attached, and the description of the filter 13A in FIG.

  As shown in FIG. 18, the radioactive organic iodine removing filter 13B is made of a single sheet 38 formed of activated carbon fibers. In the filter 13B, the sheet 38 is folded zigzag (bellows shape) so as to repeat undulation in the lateral direction (one direction). The filter 13B is detachably accommodated inside the first filter case 14 in a state of being folded zigzag in the lateral direction. The sheet 38 has any form of a fiber nonwoven fabric, a woven fabric, and a knitted fabric, and the entire sheet 38 is encapsulated in a water-repellent fiber nonwoven fabric 40 or a hydrophobic fiber nonwoven fabric subjected to a water-repellent treatment. .

  Between the opposing portions 41 of the sheet 38 that are folded in a zigzag manner, separators 42 that form an arc so as to repeat undulations in the vertical direction are arranged, and a predetermined gap 43 is formed by the separators 42. (With the aid of FIG. 12). The activated carbon fiber is attached with triethylenediamine C6H12N2 (amines) that adsorbs radioactive organic iodine. The amount of triethylenediamine C6H12N2 attached to the unit weight of the activated carbon fiber is in the range of 10 to 20% by weight, preferably in the range of 12 to 18% by weight, and more preferably in the range of 13 to 16% by weight. In addition to triethylenediamine C6H12N2, as the amines, one of the amines that can be attached to the activated carbon fiber of the filter 13A in FIG. 6 or an amine mixed with several of them can be used.

  The first filter case 14 and the first to third reinforcing members 51 to 53 are the same as those of the filter 13A of FIG. Note that the bracing structure of FIG. 14 can also be adopted as the first reinforcing member 51. The length dimensions L1, L2 in the vertical and horizontal directions and the length dimension L3 in the front-rear direction of the first filter case 14 are the same as those of the filter 13A in FIG.

  In the filter 13B, when the area of the air inlet 47 (air outlet 48) of the first filter case 14 is constant, the length dimension of the filter case 14 in the front-rear direction depends on the amount of air flowing into the air inlet 47. The length dimension L4 from the first bent portion 49 located on the air inlet 47 side of the sheet 38 folded in a zigzag to the second bent portion 50 located on the air outlet 48 side is determined. . The filter 13B maintains a constant area of the air inlet 47 (air outlet 48) of the first filter case 14 while maintaining the area of the air inlet 47 (the air outlet 48) of the first filter case 14 according to the amount of air flowing from the air inlet 47. The length L4 from 49 to the second bent portion 50 can be determined, and the air volume in the filter 13B can be freely set within the standard while maintaining the area of the air inlet 47 (air outlet 48) at the standard. It is possible to freely select the amount of clean air per unit time.

  In the filter 13B, the surface speed is in the range of 10 to 25 cm / sec, preferably in the range of 15 to 20 cm / sec. Similarly to the filter 13A of FIG. 5, the filter 13B has a radioactive organic iodine removal efficiency of 95% calculated from the methyl iodide removal efficiency (radioactive organic iodine removal efficiency) of the test filter 63 calculated using the test apparatus 54. Above, preferably 97% or more, more preferably 99.999% or more (air humidity 95%). If the surface speed is less than 10 cm / sec, the amount of air cleaning treatment per unit time cannot be increased. If the surface speed exceeds 25 cm / sec, the speed of the air passing through the filter 13B is too high, and the filter 13B may not be able to collect radioactive organic iodine. If the removal efficiency of radioactive organic iodine at 95% humidity of air is less than 95%, the radioactive organic iodine contained in the air may not be reliably removed.

  In the filter 13B, the number of times the sheet 38 is bent in the lateral direction (one direction) is in the range of 16 to 18 times with respect to a length of 100 mm in one direction of the filter 13B. If the number of times of folding is less than 16, the adsorption area necessary for the filter 13B cannot be ensured, and the collection performance of radioactive organic iodine may deteriorate. If the number of folding times exceeds 18, the sheets 38 overlap closely, the surface speed of the filter 13B decreases, and the amount of air cleaning processing per unit time cannot be increased. Since the number of times the sheet 38 is bent in the lateral direction is in the above range, the surface speed of the filter 13B can be increased, the amount of air cleaning per unit time can be increased, and the filter 13B is necessary. An adsorption area can be ensured and high collection performance of radioactive organic iodine can be maintained.

  FIG. 19 is a conceptual diagram showing a change state of the filters 13A and 13B in the pressure resistance test. In these filters 13A and 13B, the deformation amount of the filters 13A and 13B after the pressure resistance test was 0 to 1.0 mm. Moreover, the measurement of the methyl iodide gas removal efficiency of the filters 13A and 13B after the pressure resistance test was performed using the test apparatus 54 of FIG. The filters 13A and 13B after the pressure resistance test have a radioactive organic iodine removal efficiency of 95% or more, preferably 97% or more calculated from the methyl iodide removal efficiency (radioactive organic iodine removal efficiency) calculated using the test apparatus 54. More preferably, it was 99.999% or higher (air humidity 95%), and showed the same efficiency as the methyl iodide gas removal efficiency (radioactive organic iodine removal efficiency) before the pressure resistance test. As shown in FIG. 19, even if air flows in the direction of arrow S and a force (wind pressure) that deforms the filters 13 </ b> A and 13 </ b> B acts, the first to third reinforcing members 51 to 53 (including the bracing structure). ) Prevents deformation (including breakage and damage) of the filters 13A and 13B.

  In the pressure resistance test of the filters 13A and 13B, the filters 13A and 13B (filters 13A and 13B accommodated in the first filter case 14) are installed in a duct, and a fan (blower) is operated to allow air to flow into the filters 13A and 13B. It was measured in the actual usage state. The air volume was adjusted so that the pressure loss in the filters 13A and 13B was 1000 Pa, and the filter was left for 1 hour. After 1 hour, the supply of air was stopped, the filters 13A and 13B were removed from the duct, and the deformation of the filters 13A and 13B before and after the test and the methyl iodide gas removal efficiency (radioactive organic iodine removal efficiency) were measured.

  These filters 13A and 13B have a pressure loss in the range of 100 to 300 Pa, preferably in the range of 200 to 250 Pa, at a surface speed of 10 to 25 cm / sec. The pressure loss of the filters 13A and 13B is determined by installing the filters 13A and 13B (filters 13A and 13B accommodated in the first filter case 14) in the duct and operating a fan (blower) to allow air to flow into the filters 13A and 13B. It was measured in the actual usage state. The air volume was changed stepwise to approximately 130% of the rated air volume, and the pressure loss of the filters 13A and 13B at that time was measured.

  When the pressure loss exceeds 300 Pa, the passage speed of the air passing through the filters 13A and 13B is slow, the flow rate of the air passing through the filters 13A and 13B is reduced, and the amount of air purification processing per unit time may be increased. Can not. If the pressure loss is less than 100 Pa, the passage speed of the air passing through the filters 13A and 13B is too high, and the filters 13A and 13B may not be able to collect radioactive organic iodine.

  In these filters 13A and 13B, the average fiber diameter of the activated carbon fibers is in the range of 10 to 18 μm, preferably in the range of 12 to 16 μm. When the average fiber diameter exceeds 18 μm, the geometrical surface area of the activated carbon fiber is relatively reduced, and thus the removal efficiency of radioactive organic iodine in the filters 13A and 13B defined in the claims cannot be obtained. There is. If the fiber diameter is less than 10 μm, the air permeability of the sheet 38 decreases, the pressure loss of the filters 13A and 13B increases, and the surface speed of the filters 13A and 13B decreases.

In these filters 13A and 13B, the basis weight of the sheet 11 (one sheet) is in the range of 100 to 350 g / m ² , preferably in the range of 150 to 300 g / m ² , more preferably in the range of 180 to 270 g / m ² . is there. The apparent bulk density of the sheet 11 (one sheet) is in the range of 0.03 to 0.13 g / cm ³ , preferably in the range of 0.05 to 0.011 g / cm ³ . When the basis weight of the sheet 38 is less than 100 g / m ² and the apparent bulk density of the sheet 38 is less than 0.03 g / cm ³ , the strength of the sheet 38 is weak and the sheet 38 cannot maintain its form. There is. When the basis weight of the sheet 38 exceeds 350 g / m ² and the apparent bulk density of the sheet 38 exceeds 0.13 g / cm ³ , the air permeability of the sheet 38 decreases and the pressure loss of the filters 13A and 13B increases. Thus, the surface speed of the filters 13A and 13B decreases. Further, the thickness dimension of the sheet 38 becomes necessary and not only the flexibility of the sheet 38 is reduced, but also the overall dimensions of the filters 13A and 13B cannot be made compact, and the filters 13A and 13B per unit volume cannot be made compact. The weight cannot be reduced.

  Since the average fiber diameter of the activated carbon fiber, the basis weight of the sheet 38, and the apparent bulk density of the sheet 38 are within the above ranges, the overall dimensions of the filters 13A and 13B made by zigzag folding the sheet 38 in the lateral direction are compact. In addition, the weight of the filters 13A and 13B per unit volume can be reduced, and the filters 13A and 13B are not bulky, and can be easily carried, installed, and removed. Further, since the overall dimensions of the filters 13A and 13B can be made compact, the apparatus 10A itself can be made compact.

  In these filters 13A and 13B, the thickness dimension L5 of the sheet 38 is in the range of 2 to 4 mm (in the case of the laminated sheet 39, in the range of 4 to 8 mm), preferably 3 mm (in the case of the laminated sheet 39, 6 mm). (See FIGS. 13 and 18). If the thickness dimension L5 of the sheet 38 is less than 2 mm, the strength of the sheet 38 is weak, and the sheet 38 may not be able to maintain its form. If the thickness dimension L5 of the sheet 38 exceeds 4 mm, the air permeability of the sheet 38 decreases, the pressure loss of the filters 13A and 13B increases, and the surface speed of the filters 13A and 13B decreases. In addition, the thickness L5 of the sheet 38 becomes unnecessarily large, and not only the flexibility of the sheet 38 is lowered, but the overall dimensions of the filters 13A and 13B cannot be made compact, and the filters 13A and 13B per unit volume can be reduced. The weight of 13B cannot be reduced.

  Since the thickness L5 of the sheet 38 is in the above range, the filters 13A and 13B have a compact size of the entire filter 13A and 13B formed by zigzag folding the sheet 38 (including the laminated sheet 39) in the lateral direction. In addition, the weight of the filters 13A and 13B per unit volume can be reduced, and the filters 13A and 13B are not bulky, and can be easily carried, installed and removed. Further, since the overall dimensions of the filters 13A and 13B can be made compact, the apparatus 10A itself can be made compact.

  FIG. 20 is a schematic side view of the radioactive organic iodine removing device 10A showing the flow of air. In FIG. 20, the 1st filter case 14 (radioactive organic iodine removal filter 13A, 13B) is shown with a dotted line, and it shows with the arrow S which shows the flow of air. In the radioactive organic iodine removing apparatus 10A, the air flow path 24 of the front housing 19, the air flow path 29 of the rear housing 20, and the air flow path 37 of the exhaust duct 21 are connected. The air is forced to flow into the air inlet 23 of the front housing 19 by the fan 16 and passes through the air flow path 29 of the rear housing 20 while flowing through the filter 13A (or the filter 13B) from the air flow path 24 of the front housing 19. At the same time, the air flows from the air flow path 29 of the rear housing 20 through the air flow path 37 of the exhaust duct 21 and flows out from the air supply port 35 of the duct 21.

  An example of the operation procedure of the radioactive organic iodine removing device 10A is as follows. After releasing the fixing of the rear hatch 31 and the rear housing 20, the hatch 31 is opened by turning the hatch 31 rearward in the front-rear direction, and the accommodation space 30 is opened. After opening the rear hatch 31, the first filter case 14 is fixed to the accommodation space 30 of the rear housing 20 via the filter support guide, and the case 14 is installed in the space 30. The first filter case 14 is set with any one of the filters 13A and 13B shown in FIG.

  When the first filter case 14 is installed in the accommodation space 30, the air inlet 47 of the case 14 faces the rear end portion 28 of the front housing 19, and the air outlet 48 of the case 14 faces the rear hatch 31. After the first filter case 14 is installed in the accommodation space 30, the rear hatch 31 is pivoted forward and backward to close the hatch 31, the accommodation space 30 is closed, and the hatch 31 and the rear housing 20 are hermetically sealed by a fixing means. Link. The caster 18 attached to the gantry 11 moves the device to a place where radioactive organic iodine is likely to be generated in a nuclear facility or medical facility, and then the caster 18 is locked and the device 10A is fixed to the place. To do.

Next, the control box 17 is switched on. When the switch is turned on, the set temperature of the heater 15 and the rotation speed (output) of the fan 16 are displayed on the display, and an air cleaning execution button, an air cleaning stop button, and a device stop button are displayed (not shown). . When changing the set temperature of the heater 15, the input key of the numeric keypad unit is operated to input a new set temperature. When changing the rotation speed of the fan 16, the input key is operated to input a new rotation speed. The number of rotations of the fan 16 can be changed in the range of air volume 28 to 60 m ³ / min. There is no change in the set temperature of the heater 15 and the rotation speed of the fan 16, or after the set temperature and the rotation speed are changed, the air cleaning execution button is pressed.

  When the air cleaning execution button is pressed, the heater 15 and the fan 16 are activated. When the air cleaning stop button is pressed, the heater 15 and the fan 16 are stopped. When the device stop button is pressed, the switch is turned off and the device 10A stops. The air in the facility is forcibly sucked into the apparatus 10A by the fan 16. The air flows into the housing 19 from the air inlet 23 of the front housing 19, and then flows into the heater 15 through the air flow path 24 of the housing 19. The air is heated to a set temperature by the heater element of the heater 15, the moisture contained therein evaporates, and the humidity decreases.

  The air heated to a predetermined temperature flows into the rear housing 20 from the rear end portion 28 of the front housing 19. Note that an air inlet 47 of the first filter case 14 is located at the front end portion 27 of the rear housing 20 (the rear end portion 28 of the front housing 19), and the air heated to a predetermined temperature is air inlet 47. The air flows into the filter 13A (or the filter 13B) through the filter 13A (or the filter 13B), and then flows out from the air outlet 48 of the case 14. When the radioactive organic iodine is contained in the air, the radioactive organic iodine is collected in the micropores of the activated carbon fiber and adsorbed on the triethylenediamine C6H12N2 attached to the activated carbon fiber to clean the air. The air flowing out from the filter 13A (or the filter 13B) flows into the air flow path 37 of the exhaust duct 21 through the air flow path 29 of the rear housing 20, and flows through the air flow path 38 of the duct 21 to supply the duct 21. It is returned to the facility from the mouth 35.

  The temperature sensor measures the temperature of the air flowing out of the heater 15 and outputs the measured temperature to the control box 17. When the air temperature deviates from the set temperature, the control box 17 performs feedback control for adjusting the temperature of the heater 15 so that the air temperature is returned to the set temperature. Note that the rotational speed of the fan 16 can be changed during operation. When a new rotation speed is input by operating the input key of the numeric keypad unit, the control box 17 performs inverter control to change the rotation speed of the fan 16 to the input rotation speed.

  The radioactive organic iodine removing device 10A has triethylenediamine C6H12N2 (amines) adsorbing radioactive organic iodine attached to activated carbon fibers, and the surface speed of the radioactive organic iodine removing filters 13A and 13B is in the range of 10 to 25 cm / sec. The filter 13A, 13B has a radioactive organic iodine removal efficiency of 95% or more, preferably 97% or more, and more preferably 99.999% or more when the humidity of the air is 95%. The organic iodine removal performance is demonstrated, the air passage speed in the filters 13A and 13B is high, the flow rate of air passing through the filters 13A and 13B is large, and the amount of air purification processing per unit time in the apparatus 10A is increased. As well as radioactive organic iodine contained in the air. Indeed collected and can be removed, it is possible to make a clean air to remove the radioactive organic iodine.

  The radioactive organic iodine removing device 10A can evaporate the moisture contained in the air by heating the air to a predetermined temperature by the heater 15, and the radioactive organic iodine removing filters 13A and 13B due to the moisture contained in the air. It is possible to prevent a decrease in the efficiency of removing radioactive organic iodine. The radioactive organic iodine removing device 10A can reliably remove radioactive organic iodine generated from these facilities by using it in nuclear facilities and medical facilities where radioactive organic iodine may be generated. Sex can be secured.

  21 is a rear view of a radioactive organic iodine removing device 10B shown as another example, and FIG. 22 is a schematic side view of the radioactive organic iodine removing device 10B of FIG. 21 showing the flow of air. FIG. 23 is a perspective view of the second filter case 64 that houses the HEPA filter 65. FIG. 21 shows a state in which the rear hatch 31 is opened, and the first and second filter cases 14 and 64 are accommodated in the first and second accommodation spaces 30A and 30B. In FIG. 22, the first and second filter cases 14 and 64 (filters 13A, 13B, and 65) are indicated by dotted lines, and are indicated by arrows S indicating the flow of air. In FIG. 23, the vertical direction is indicated by an arrow A, the horizontal direction is indicated by an arrow B, and the front-rear direction is indicated by an arrow C.

  This radioactive organic iodine removing device 10B is different from that shown in FIG. 1 in that a high air volume HEPA filter 65 is disposed below (upstream) the rear housing 20 in the vertical direction. Since the other configuration of the radioactive organic iodine removing apparatus 10B is the same as that of the apparatus 10A of FIG. 1, the same reference numerals as those of FIG. 1 are used, and the description of FIG. Description of is omitted. In addition, the filter 13A, 13B of either FIG. 6 or FIG. 16 is used for the radioactive organic iodine removal filter installed in the 1st filter case 14 so that attachment or detachment is possible.

  Inside the rear housing 20, an air flow path 29 for air flowing in from the front housing 19 and a housing space 30 for housing the first and second filter cases 14 and 64 are formed. The storage space 30 is divided into a first storage space 30A and a second storage space 30B located above the first storage space 30A in the vertical direction. In the first and second accommodation spaces 30A and 30B, filter support guides (not shown) for removably fixing the filter cases 14 and 64 are installed therein.

  The first filter case 14 containing the radioactive organic iodine removal filter 13A (or filter 13B) is supported by a filter support guide and fixed to the second accommodation space 30B. The second filter case 64 that houses the HEPA filter 65 is supported by the filter support guide and is fixed to the first housing space 30A. Therefore, in this radioactive organic iodine removing device 10B, the first filter case 14 is installed above and below the second filter case 64 (downstream side), and the radioactive organic iodine removing filter 13A (or the filter 13B) is the HEPA filter 65. It arrange | positions in the up-down direction upper direction (downstream side). The HEPA filter 65 collects dust containing fine particles in the air with an efficiency of 99.97% or more.

  The 2nd filter case 64 which accommodates the HEPA filter 65 is made from a plywood, The front shape is shape | molded in the rectangle. The second filter case 64 may be made of metal (iron plate, aluminum plate, stainless steel plate, etc.) or synthetic resin in addition to the plywood. The second filter case 64 has a pair of rectangular flat plate members 66 (third outer frame members) extending in the horizontal direction and spaced apart from each other in the vertical direction, and a planar shape extending in the vertical direction while facing the horizontal direction. It is made from a pair of rectangular vertical plate members 67 (fourth outer frame member).

  In the second filter case 64, the end of the horizontal plate member 66 and the end of the vertical plate member 67 are fixed through fixing means (such as screws or adhesive). The second filter case 64 has an air inlet 68 on the front side and an air outlet 69 on the back side. The longitudinal and lateral lengths L6 and L7 of the second filter case 64 are the same as those of the first filter case 14 containing the filters 13A and 13B, and the air inlet 68 (air outlet 69) of the filter case 64 Is the same as that of the filter case 14. The length L8 of the filter case 64 in the front-rear direction is shorter than that of the first filter case 14.

  Two guide plates 70 are attached to the rear hatch 31 so as to be spaced apart at equal intervals in the horizontal direction and extending in the vertical direction. The vertical dimension of the guide plate 70 is substantially the same as the vertical dimension of the storage space 30. The longitudinal dimension of the guide plate 70 is such that when the rear hatch 31 is closed, the edge of the guide plate 70 abuts against the air inlet 47 of the first filter case 14 and the edge of the guide plate 70 is The length is adjusted so as to contact the air outlet 69 of the second filter case 64.

  An example of the operation procedure of the radioactive organic iodine removing apparatus 10B is as follows. After releasing the fixing of the rear hatch 31 and the rear housing 20, the hatch 31 is pivoted rearward in the front-rear direction to open the hatch 31, and the first and second accommodation spaces 30A, 30B are opened. After opening the rear hatch 31, the first filter case 14 is fixed to the second housing space 30B of the rear housing 20 via the filter support guide, the case 14 is installed in the space 30B, and the first filter case 14 is installed via the filter support guide. 2 The filter case 64 is fixed to the first housing space 30A of the rear housing 20, and the case 64 is installed in the space 30A. The first filter case 14 is set with the radioactive organic iodine removal filter 13A (or filter 13B) of FIG. 6 or FIG. 16, and the second filter case 64 is set with the HEPA filter 65. .

  When the first filter case 14 is installed in the second accommodation space 30 </ b> B, the air inlet 47 of the case 14 faces the rear hatch 31, and the air outlet 48 of the case 14 faces the front end 32 of the exhaust duct 21. When the second filter case 64 is installed in the first accommodation space 30 </ b> A, the air inlet 68 of the case 64 faces the rear end portion 28 of the front housing 19, and the air outlet 69 of the case 64 faces the rear hatch 31. After the filter cases 14 and 64 are installed in the storage spaces 30A and 30B, the rear hatch 31 is pivoted forward in the front-rear direction to close the hatch 31, and the first and second storage spaces 30A and 30B are closed. And the rear housing 20 are hermetically connected by fixing means.

  When the hatch 31 is closed, the edge of the guide plate 70 contacts the air inlet 47 of the first filter case 14, and the edge of the guide plate 70 contacts the air outlet 69 of the second filter case 64. The air flow path 29 of the rear housing 20 is divided into three in the lateral direction by the guide plates 70. The caster 18 attached to the gantry 11 moves the device 10B to a location where radioactive organic iodine is likely to be generated in a nuclear facility or medical facility, and then the caster 18 is locked and the device 10B is moved to that location. Fix it.

  Next, the control box 17 is switched on. When the switch is turned on, the set temperature of the heater 15 and the rotation speed (output) of the fan 16 are displayed on the display, and an air cleaning execution button, an air cleaning stop button, and a device stop button are displayed (not shown). . There is no change in the set temperature of the heater 15 and the rotation speed of the fan 16, or after the set temperature and the rotation speed are changed, the air cleaning execution button is pressed. When the air cleaning execution button is pressed, the heater 15 and the fan 16 are activated. The air in the facility is forcibly sucked into the apparatus 10B by the fan 16. The air flows into the housing 19 from the air inlet 23 of the front housing 19, and then flows into the heater 15 through the air flow path 24 of the housing 19. The air is heated to a set temperature by the heater element of the heater 15, the moisture contained therein evaporates, and the humidity decreases.

  The air heated to a predetermined temperature flows into the rear housing 20 from the rear end portion 28 of the front housing 19. Note that an air inlet 68 of the second filter case 64 is located at the front end portion 27 (the rear end portion 28 of the front housing 19) of the rear housing 20, and air heated to a predetermined temperature is air inlet 68. And then flows into the HEPA filter 65, flows through the filter 65, and then flows out from the air outlet 69 of the filter case 64. When dust is contained in the air, the dust is collected by the HEPA filter 65 and the dust in the air is removed.

  The air flowing out from the air outlet 69 of the second filter case 64 flows into the air inlet 47 of the first filter case 14 through the air flow path 29 of the rear housing 20 that is divided into three by the guide plate 70 in the lateral direction. Then, it flows into the radioactive organic iodine removal filter 13A (or filter 13B) through the air inlet 47, flows through the filter 13A (or filter 13B), and then flows out from the air outlet 48 of the filter case 14. The guide plate 70 is formed from a HEPA filter 65 (a filter positioned in the lower part in the vertical direction) located in the first storage space 30A to a radioactive organic iodine removal filter 13A (or filter 13B) (in the upper part in the vertical direction) located in the second storage space 30B. Air is guided to the entire area of the filter.

  When radioactive organic iodine is contained in the air that has passed through the filter 13A (or the filter 13B), the radioactive organic iodine is collected in the micropores of the activated carbon fiber and triethylenediamine C6H12N2 attached to the activated carbon fiber. Adsorbed to the air to clean the air. Air that has flowed out of the filter 13A (or the filter 13B) flows into the air flow path 37 of the exhaust duct 21 from the air outlet 48 of the first filter case 14, passes through the air flow path 37 of the duct 21, and is supplied to the duct 21. It is returned to the facility from the mouth 35.

  The radioactive organic iodine removing device 10B of FIG. 21 has the following effects in addition to the effects of the device 10A of FIG. In the radioactive organic iodine removing device 10B, the HEPA filter 65 having a large air volume for removing dust contained in the air is disposed below (upstream) in the vertical direction (upstream side) of the radioactive organic iodine removing filters 13A and 13B. Since the dust is removed, the dust does not reach the radioactive organic iodine removal filters 13A and 13B, and the radioactive organic iodine removal performance of the filters 13A and 13B is deteriorated due to the accumulation of the dust on the radioactive organic iodine removal filters 13A and 13B. Can be prevented. The radioactive organic iodine removing device 10B can remove dust in the air, and can reliably collect and remove radioactive organic iodine contained in the air, and can be cleaned by removing dust and radioactive organic iodine. Can make air.

  In this radioactive organic iodine removing device 10B, air is guided by the guide plate 70 from the HEPA filter 65 located in the first storage space 30A to the entire area of the radioactive organic iodine removal filters 13A and 13B located in the second storage space 30B. Air does not flow unevenly into the radioactive organic iodine removal filters 13A and 13B, and the entire area of the radioactive organic iodine removal filters 13A and 13B can be used for air purification, and the air is efficiently cleaned within a unit time. be able to. In the radioactive organic iodine removing apparatus 10B, since the HEPA filter 65 has a large air volume, the surface speed of the radioactive organic iodine removing filters 13A and 13B is not lowered by the HEPA filter 65, and the air passage speed in the filters 13A and 13B. And the amount of air cleaning treatment per unit time can be increased. In the radioactive organic iodine removing device 10B, since the radioactive organic iodine removing filters 13A, 13B and the HEPA filter 65 are arranged in the vertical direction, the longitudinal direction of the apparatus 10B is compared with the case where the filters 13A, 13B, 65 are arranged in the longitudinal direction. Can be reduced, and the apparatus 10B can be made compact.

  24 is a rear view of a radioactive organic iodine removing device 10B shown as another example, and FIG. 25 is a schematic side view of the radioactive organic iodine removing device 10B of FIG. 24 showing the flow of air. FIG. 24 shows a state in which the rear hatch 31 is opened, and the first and second filter cases 14 and 64 are accommodated in the first and second accommodation spaces 30A and 30B. In FIG. 25, the first and second filter cases 14, 64 (filters 13A, 13B, 65) are indicated by dotted lines, and are indicated by arrows S indicating the flow of air.

  This radioactive organic iodine removing device 10B is different from that shown in FIGS. 1 and 21 in that a radioactive organic iodine removing filter 13A (or filter 13B) is arranged below (in the downstream side of) the rear housing 20 in the vertical direction. A high air volume HEPA filter 65 is arranged above (downstream) in the direction. Other configurations of the radioactive organic iodine removing device 10B are the same as those of the devices 10A and 10B of FIG. 1 and FIG. 21, so that the same reference numerals as those of the drawings are attached, and the explanation of these drawings is used to support this device. The description of other configurations in 10B is omitted. In addition, the filter 13A, 13B of either FIG. 6 or FIG. 16 is used for the radioactive organic iodine removal filter installed in the 1st filter case 14 so that attachment or detachment is possible.

  The first filter case 14 housing the radioactive organic iodine removing filter 13A (or filter 13B) is supported by the filter support guide and fixed to the first housing space 30A. The second filter case 64 that houses the HEPA filter 65 is supported by the filter support guide and is fixed to the second housing space 30B. Therefore, in this radioactive organic iodine removing device 10B, the first filter case 14 is installed in the upper and lower direction (upstream side) of the second filter case 64, and the radioactive organic iodine removing filter 13A (or the filter 13B) is the HEPA filter 65. It is arranged below in the vertical direction (upstream side). The second filter case 64 that houses the HEPA filter 65 is the same as that of FIG. As in the apparatus 10B of FIG. 21, two guide plates 70 are attached to the rear hatch 31 so as to be spaced apart at equal intervals in the horizontal direction and extending in the vertical direction.

  An example of the operation procedure of the radioactive organic iodine removing apparatus 10B is as follows. After releasing the fixing of the rear hatch 31 and the rear housing 20, the hatch 31 is pivoted rearward in the front-rear direction to open the hatch 31, and the first and second accommodation spaces 30A, 30B are opened. After opening the rear hatch 31, the first filter case 14 is fixed to the first housing space 30A of the rear housing 20 through the filter support guide, and the case 14 is installed in the space 30A, and the first filter case 14 is installed through the filter support guide. 2 The filter case 64 is fixed to the second housing space 30B of the rear housing 20, and the case 64 is installed in the space 30B. In addition, the radioactive organic iodine removal filter 13A (or filter 13B) of either FIG. 6 or FIG. 16 is set to the first filter case 14, and the HEPA filter 65 of FIG. 23 is set to the second filter case 64. Has been.

  When the first filter case 14 is installed in the first accommodation space 30 </ b> A, the air inlet 47 of the case 14 faces the rear end portion 28 of the front housing 19, and the air outlet 48 of the case 14 faces the rear hatch 31. When the second filter case 64 is installed in the second accommodation space 30 </ b> B, the air inlet 68 of the case 64 faces the rear hatch 31, and the air outlet 69 of the case 64 faces the front end 32 of the exhaust duct 21. After the filter cases 14 and 64 are installed in the storage spaces 30A and 30B, the rear hatch 31 is pivoted forward in the front-rear direction to close the hatch 31, and the first and second storage spaces 30A and 30B are closed. And the rear housing 20 are hermetically connected by fixing means.

  When the hatch 31 is closed, the edge of the guide plate 70 contacts the air inlet 47 of the first filter case 14, and the edge of the guide plate 70 contacts the air outlet 69 of the second filter case 64. The air flow path 29 of the rear housing 20 is divided into three in the lateral direction by the guide plates 70. The caster 18 attached to the gantry 11 moves the device 10B to a location where radioactive organic iodine is likely to be generated in a nuclear facility or medical facility, and then the caster 18 is locked and the device 10B is moved to that location. Fix it.

  Next, the control box 17 is switched on. When the switch is turned on, the set temperature of the heater 15 and the rotation speed (output) of the fan 16 are displayed on the display, and an air cleaning execution button, an air cleaning stop button, and a device stop button are displayed (not shown). . When the air cleaning execution button is pressed, the heater 15 and the fan 16 are activated. The air in the facility is forcibly sucked into the apparatus 10B by the fan 16. The air flows into the housing 19 from the air inlet 23 of the front housing 19, and then flows into the heater 15 through the air flow path 24 of the housing 19. The air is heated to a set temperature by the heater element of the heater 15, the moisture contained therein evaporates, and the humidity decreases.

  The air heated to a predetermined temperature flows into the rear housing 20 from the rear end portion 28 of the front housing 19. Note that an air inlet 47 of the first filter case 14 is located at the front end portion 27 of the rear housing 20 (the rear end portion 28 of the front housing 19), and the air heated to a predetermined temperature is air inlet 47. And then flows into the radioactive organic iodine removal filter 13A (or filter 13B), flows through the filter 13A (or filter 13B), and then flows out from the air outlet 48 of the filter case 14. When radioactive organic iodine is contained in the air, the radioactive organic iodine is collected in the micropores of the activated carbon fiber and adsorbed on the triethylenediamine C6H12N2 attached to the activated carbon fiber.

  The air flowing out from the air outlet 48 of the first filter case 14 flows into the air inlet 68 of the second filter case 64 through the air flow path 29 of the rear housing 20 that is divided into three by the guide plate 70 in the lateral direction. Then, the air flows into the HEPA filter 65 through the air inlet 68, flows through the filter 65, and then flows out from the air outlet 69 of the filter case 64. The guide plate 70 is formed from the radioactive organic iodine removal filter 13A (or filter 13B) (filter positioned downward in the vertical direction) located in the first storage space 30A to the HEPA filter 65 (upward in the vertical direction) located in the second storage space 30B. Air is guided to the entire area of the filter.

  When dust is contained in the air that has passed through the radioactive organic iodine filter 13A (or filter 13B), the dust is collected by the HEPA filter 65, dust in the air is removed, and the air is purified. The air flowing out from the filter 65 flows into the air flow path 37 of the exhaust duct 21 from the air outlet 69 of the second filter case 64, passes through the air flow path 37 of the duct 21, and passes through the air supply port 35 of the duct 21. Returned in.

  The radioactive organic iodine removing apparatus 10B in FIG. 24 has the following effects in addition to the effects of the apparatus 10A in FIG. In the radioactive organic iodine removing device 10B, a high air volume HEPA filter 65 that removes dust contained in air is arranged above and below (upstream) the radioactive organic iodine removing filters 13A and 13B, and the radioactive organic iodine removing filter 13A, Even if dust is released from 13B, the dust is removed by the HEPA filter 65, so that the dust released from the radioactive organic iodine removal filters 13A and 13B can be reliably removed. The radioactive organic iodine removing device 10B can reliably collect and remove radioactive organic iodine contained in the air, and can remove dust emitted from the radioactive organic iodine removing filters 13A and 13B. Clean air from which organic iodine and dust are removed can be created.

  In the radioactive organic iodine removing device 10B, air is guided by the guide plate 70 from the radioactive organic iodine removing filters 13A and 13B located in the first storage space 30A to the entire area of the HEPA filter 65 located in the second storage space 30B. Air does not flow unevenly into the HEPA filter 65, and the entire area of the HEPA filter 65 can be used for dust removal, so that the air can be efficiently cleaned within a unit time. In the radioactive organic iodine removing apparatus 10B, since the HEPA filter 65 has a large air volume, the surface speed of the radioactive organic iodine removing filters 13A and 13B is not lowered by the HEPA filter 65, and the air passage speed in the filters 13A and 13B. And the amount of air cleaning treatment per unit time can be increased. In the radioactive organic iodine removing device 10B, since the radioactive organic iodine removing filters 13A, 13B and the HEPA filter 65 are arranged in the vertical direction, the longitudinal direction of the apparatus 10B is compared with the case where the filters 13A, 13B, 65 are arranged in the longitudinal direction. Can be reduced, and the apparatus 10B can be made compact.

DESCRIPTION OF SYMBOLS 10A Radioactive organic iodine removal apparatus 10B Radioactive organic iodine removal apparatus 13 Radioactive organic iodine removal filter 13A Radioactive organic iodine removal filter 13B Radioactive organic iodine removal filter 14 1st filter case 15 Heater (heater)
16 Fan (blower)
17 Control box 30 Storage space 30A 1st storage space 30B 2nd storage space 31 Rear hatch 38 Sheet 39 Laminated sheet 40 Water-repellent fiber nonwoven fabric or hydrophobic fiber nonwoven fabric 41 Opposite portion 42 Separator 43 Space 44 Horizontal plate member (first outer frame) Element)
45 Vertical plate member (second outer frame member)
47 Air inlet 48 Air outlet 49 First bent portion 50 Second bent portion 51 First reinforcing member 52 Second reinforcing member 64 Second filter case 65 HEPA filter 66 Horizontal plate member (third outer frame member)
67 Vertical plate member (fourth outer frame member)
68 Air inlet 69 Air outlet 70 Guide plate

Claims (16)

A radioactive organic iodine removal filter in which a sheet formed of activated carbon fibers is zigzag-folded in one direction; a first filter case having an air inlet and an air outlet and containing the radioactive organic iodine removal filter; A radioactive organic iodine removing apparatus that includes a blower that forcibly flows air into the first filter case, and removes radioactive organic iodine contained in the air;
The amine adsorbing the radioactive organic iodine is attached to the activated carbon fiber, the surface speed of the radioactive organic iodine removing filter is in the range of 10 to 25 cm / sec, and the radioactive organic at 95% humidity of the air A radioactive organic iodine removing apparatus, wherein the iodine removing filter has a radioactive organic iodine removing efficiency of 95% or more.   The first filter case is formed of a pair of first outer frame members extending in parallel in the one direction and a pair of second outer frame members extending in parallel in a direction intersecting with the one direction. The 1st reinforcement member which prevents the deformation | transformation of the said radioactive organic iodine removal filter ranging over at least one of the said 1st and 2nd outer frame member is attached to the air outlet side of 1 filter case. The radioactive organic iodine removal apparatus described in 1.   The first sheet of the sheet located between the opposed portions of the sheet folded in zigzag and at the center of the first outer frame member on the air inlet side of the first filter case. The radioactive organic iodine removal apparatus of Claim 2 to which the 2nd reinforcement member extended toward the said 1st reinforcement member from the inner side of a bending part is attached.   In the radioactive organic iodine removing apparatus, when the area of the air inlet of the first filter case is constant, the air flow rate of the air flowing into the air inlet causes the air inlet side of the first filter case to approach the air inlet. The radioactive organic iodine removal apparatus in any one of Claim 1 thru | or 3 from which the dimension from the 1st bending part of the said sheet | seat located to the 2nd bending part of this sheet | seat located in the air outlet side is determined.   The radioactive organic iodine removing device includes a high air volume HEPA filter that removes dust contained in the air, and a second filter case that has an air inlet and an air outlet and accommodates the HEPA filter, A HEPA filter is disposed on at least one of an upstream side and a downstream side of the radioactive organic iodine removal filter, and the blower forcibly causes the air to flow into air inlets of the first and second filter cases. The radioactive organic iodine removal apparatus in any one of Claims 1 thru | or 4.   In the radioactive organic iodine removing apparatus, the HEPA filter is disposed in at least one of an upper and lower direction upper and lower direction of the radioactive organic iodine removing filter, and the air passes through an air channel extending in the vertical direction. The radioactive organic iodine removal apparatus of Claim 5 which flows through these filters in order toward the filter located in the up-down direction upper direction from the filter located in the up-down direction lower side.   The said air flow path is installed with the guide plate extended in the up-down direction for guide | inducing the said air to the whole region of the filter located in the said up-down direction upper direction from the filter located in the up-down direction lower side. Radioactive iodine removal device.   The radioactive organic iodine removal apparatus in any one of Claim 1 thru | or 7 with which the heater which heats the said air to predetermined temperature is arrange | positioned in the upstream of the said radioactive organic iodine removal filter.   The radioactive organic iodine removing apparatus according to any one of claims 1 to 8, wherein a pressure loss of the radioactive organic iodine removing filter at the surface speed is in a range of 100 to 300 Pa.   The radioactivity according to any one of claims 1 to 9, wherein the amine is triethylenediamine C6H12N2, and the amount of the triethylenediamine C6H12N2 attached to the unit weight of the activated carbon fiber is in the range of 10 to 20% by weight. Organic iodine removal device. The average fiber diameter of the activated carbon fiber is in the range of 10 to 18 μm, the basis weight of the sheet is in the range of 100 to 350 g / m ² , and the apparent bulk density of the sheet is 0.03 to 0.13 g / The radioactive organic iodine removing apparatus according to any one of claims 1 to 10, which is in a range of cm ³ .   The radioactive organic iodine removing apparatus according to any one of claims 1 to 11, wherein a thickness dimension of the sheet is in a range of 2 to 4 mm.   The radioactive organic iodine removal filter is made from one sheet, and the number of folding in one direction of the sheet is in a range of 16 to 18 times with respect to a length of 100 mm in one direction of the radioactive iodine removal filter. The radioactive organic iodine removal apparatus in any one of Claims 1 thru | or 12.   The radioactive organic iodine removal filter is made from the two sheets stacked in the thickness direction, and the number of folding in one direction of the two sheets is 100 mm in one direction of the length of the radioactive iodine removal filter. The radioactive organic iodine removing apparatus according to any one of claims 1 to 12, wherein the apparatus is in the range of 8 to 9 times.   The radioactive organic iodine removal apparatus in any one of Claims 1 thru | or 14 in which the said sheet | seat has a form in any one of a fiber nonwoven fabric, a textile fabric, and knitting.   The radioactive organic iodine removing apparatus according to any one of claims 1 to 15, wherein the entire sheet is encapsulated in a water-repellent fiber nonwoven fabric or a hydrophobic fiber nonwoven fabric.

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