WO2018110547A1 - 放射性物質除去フィルタ、それを用いる放射性物質除去フィルタユニット及び放射性物質の除去方法 - Google Patents

放射性物質除去フィルタ、それを用いる放射性物質除去フィルタユニット及び放射性物質の除去方法 Download PDF

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WO2018110547A1
WO2018110547A1 PCT/JP2017/044560 JP2017044560W WO2018110547A1 WO 2018110547 A1 WO2018110547 A1 WO 2018110547A1 JP 2017044560 W JP2017044560 W JP 2017044560W WO 2018110547 A1 WO2018110547 A1 WO 2018110547A1
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Prior art keywords
activated carbon
radioactive substance
removal filter
substance removal
amine compound
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PCT/JP2017/044560
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English (en)
French (fr)
Japanese (ja)
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増森　忠雄
靖夫 若井田
憲夫 野川
Original Assignee
東洋紡株式会社
株式会社ワカイダ・エンジニアリング
国立大学法人東京大学
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Application filed by 東洋紡株式会社, 株式会社ワカイダ・エンジニアリング, 国立大学法人東京大学 filed Critical 東洋紡株式会社
Priority to CN201780077292.0A priority Critical patent/CN110073444B/zh
Priority to KR1020197012138A priority patent/KR102526926B1/ko
Publication of WO2018110547A1 publication Critical patent/WO2018110547A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2055—Carbonaceous material
    • B01D39/2065—Carbonaceous material the material being fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/02—Treating gases

Definitions

  • the present invention relates to a radioactive substance removal filter, and more particularly to a radioactive substance removal filter that removes radioactive substances contained in a gas, particularly radioactive iodine and organic iodine compounds.
  • radioactive substance removal filters are used.
  • a radioactive substance removal filter for removing gaseous iodine a processing method for collecting and removing gaseous iodine by allowing air to pass through an activated carbonized sheet-shaped charcoal filter is known (for example, Patent Documents). 1).
  • the pore volume with a pore diameter of 3 to 30 nm is 0.15 cc / g or less and the pore diameter is 3 nm or less.
  • a radioactive substance removal filter having a filter medium formed by attaching an amine to a sheet made of activated carbon having a volume of 0.50 cc / g or more and laminating a protective sheet on at least one of the sheets made of activated carbon for example, Patent Document 2.
  • liquid scintillation counters are used to measure radiation.
  • a liquid scintillation cocktail used for a liquid scintillation counter an organic solvent having a boiling point of 120 ° C. or higher and a high boiling point compound such as 1,2,4-trimethylbenzene and linear dodecylbenzene is used.
  • the exhaust gas of the facility contains a trace amount of these organic solvents (VOC) in addition to gaseous radioactive substances.
  • VOC organic solvent of a high boiling point compound adheres to the radioactive substance removal filter like patent document 1 and patent document 2, and becomes a reduction factor of the removal performance of the radioactive substance using these radioactive substance removal filters.
  • the present invention has been made in view of the above circumstances, and its purpose is to provide radioactive iodine and organic matter even when a gaseous organic solvent, particularly a high boiling point compound having a boiling point of 120 ° C. or more, is contained in the gas.
  • An object of the present invention is to provide a radioactive substance removal filter that can suppress a reduction in the removal performance of radioactive substances such as iodine compounds, a radioactive substance removal filter unit using the radioactive substance removal filter, and a radioactive substance removal method.
  • the radioactive substance removal filter of the present invention that has been able to solve the above-mentioned problem comprises an activated carbon fiber layer on the downstream side and an activated carbon particle layer on the upstream side, and the activated carbon fiber layer is a fibrous material to which an amine compound is attached. It has activated carbon, and the ratio of the amount of amine compound attached to the activated carbon particle layer to the amount of amine compound attached to the activated carbon fiber layer (the amount of amine compound attached to the activated carbon particle layer / the amount of amine compound attached to the activated carbon fiber layer) is 0. .1 or less (including 0).
  • the radioactive substance removal filter of the present invention adsorbs the organic solvent in the gas in the upstream activated carbon particle layer, the activated carbon fiber layer on the downstream side deteriorates the removal performance of radioactive iodine and organic iodine compound by the organic solvent. Can be prevented.
  • the amine compound is preferably water-soluble, and more preferably triethylenediamine.
  • the amount of the amine compound attached to the activated carbon fiber layer is preferably 5% by mass or more and 20% by mass or less of the fibrous activated carbon.
  • the basis weight of the fibrous activated carbon of the activated carbon fiber layer is preferably 150 g / m 2 or more and 900 g / m 2 or less.
  • the basis weight of the granular activated carbon of the activated carbon particle layer is preferably 150 g / m 2 or more and 900 g / m 2 or less.
  • the fibrous activated carbon preferably has a BET specific surface area of 800 m 2 / g or more.
  • the granular activated carbon preferably has a BET specific surface area of 800 m 2 / g or more.
  • the total pore volume of the fibrous activated carbon is preferably 0.3 cc / g or more.
  • the total pore volume of the granular activated carbon is preferably 0.3 cc / g or more.
  • the average fiber diameter of the fibrous activated carbon is preferably 10 ⁇ m or more and 40 ⁇ m or less.
  • the average particle diameter of the granular activated carbon is preferably 200 ⁇ m or more and 700 ⁇ m or less.
  • the activated carbon fiber layer and the activated carbon particle layer are laminated and preferably have a pleated shape.
  • the present invention includes a radioactive substance removal filter unit characterized by having the radioactive substance removal filter and a radioactive substance removal method.
  • the radioactive substance removal filter of the present invention is characterized in that an activated carbon fiber layer having fibrous activated carbon to which an amine compound is attached is provided on the downstream side, and an activated carbon particle layer having granular activated carbon is provided on the upstream side.
  • an activated carbon fiber layer on the downstream side and an activated carbon particle layer on the upstream side the radioactive substance removal filter removes radioactive substances such as radioactive iodine and organic iodine compounds even if organic solvents are contained in the gas. It becomes possible to suppress that performance falls, and the radioactive substance removal effect of a radioactive substance removal filter can be exhibited over a long period of time.
  • the schematic of the radioactive substance removal filter in embodiment of this invention is represented.
  • the schematic sectional drawing after the pleating process of the radioactive substance removal filter in embodiment of this invention is represented.
  • the perspective view of the radioactive substance removal filter unit in embodiment of this invention is represented.
  • the radioactive substance removal filter according to the present invention will be described in detail with reference to the drawings.
  • the present invention is not limited to the illustrated examples, and is suitable as long as it can meet the purpose described above and below. It is also possible to carry out by modifying the above, and they are all included in the technical scope of the present invention.
  • the radioactive substance removal filter according to the present invention includes an activated carbon fiber layer on the downstream side and an activated carbon particle layer on the upstream side, and the activated carbon fiber layer includes fibrous activated carbon to which an amine compound is attached, and the activated carbon particle layer
  • the ratio between the amount of the amine compound attached to the activated carbon fiber layer and the amount of the amine compound attached to the activated carbon fiber layer is 0.1 or less (including 0).
  • the downstream side is the side after the gas passes through the filter, and means the gas outflow side.
  • the upstream side is the side opposite to the downstream side, before the gas passes through the filter, and means the gas inflow side.
  • the arrows in FIGS. 1 and 2 indicate the gas flow, and the upper side in FIGS. 1 and 2 is the upstream side, and the lower side is the downstream side.
  • the activated carbon fiber layer 2 is a layer having fibrous activated carbon to which an amine compound is attached.
  • Fibrous activated carbon is fibrous activated carbon obtained by carbonizing natural fiber, regenerated fiber or synthetic fiber and performing an activation reaction by gas activation.
  • the activated carbon fiber layer 2 is obtained by laminating non-woven fabrics on both sides of a sheet-like fibrous activated carbon and performing an integration treatment.
  • the BET specific surface area of the fibrous activated carbon is preferably 800 m 2 / g or more, more preferably 1000 m 2 / g or more, and further preferably 1200 m 2 / g or more.
  • the lower limit value of the BET specific surface area of the fibrous activated carbon is this value, the radioactive substance removing effect of the activated carbon fiber layer 2 can be enhanced.
  • the total pore volume of the fibrous activated carbon is preferably 0.3 cc / g or more, more preferably 0.4 cc / g or more, and further preferably 0.5 cc / g or more.
  • the lower limit value of the total pore volume of the fibrous activated carbon is this value, the effect of removing the radioactive substance in the activated carbon fiber layer 2 is enhanced.
  • the average fiber diameter of the fibrous activated carbon is preferably 10 ⁇ m or more, and more preferably 12 ⁇ m or more.
  • the average fiber diameter of the fibrous activated carbon is preferably 40 ⁇ m or less, more preferably 35 ⁇ m or less, and further preferably 30 ⁇ m or less.
  • the upper limit value of the average fiber diameter of the fibrous activated carbon is such a value, the surface area of the activated carbon fiber layer 2 is increased, and the radioactive substance removal efficiency is improved.
  • the fibrous activated carbon is observed with an electron microscope at a magnification of 500 times, and the fiber diameter is measured. Arbitrary 100 fiber diameters are arithmetically averaged, and this average value is taken as the average fiber diameter of the fibrous activated carbon.
  • amine compound examples include 1,4-diazabicyclo [2,2,2] octane (triethylenediamine), N, N′-bis (3-aminopropyl) piperazine, N, N-dimethylaminoethyl methacrylate, N, N-dimethylaminopropylamine, 3-aminopropyltrimethoxysilane, 1,5-diazabicycloundecene, polyethyleneimine, 1,5-diazabicyclo [4.3.0] nonene, 1,8-diazabicyclo [ 5.4.0] -7-undecene, 2-methyl-1,4-diazabicyclo [2.2.2] octane, phenylhydrazine, 2-cyanopyridine, diisopropylamine, N, N ′, N′-trimethylamino Examples include ethyl piperazine, hexamethylene tetramine, and polyalkyl polyamine.
  • the amine compound used is preferably water-soluble, and more preferably 1,4-diazabicyclo [2,2,2] octane (triethylenediamine).
  • triethylenediamine 1,4-diazabicyclo [2,2,2] octane
  • the amount of the amine compound attached to the activated carbon fiber layer 2 is preferably 5% by mass or more, more preferably 7% by mass or more, and further preferably 10% by mass or more of the fibrous activated carbon.
  • the radioactive organic iodine compound can be sufficiently adsorbed.
  • the amount of the amine compound attached to the activated carbon fiber layer 2 is preferably 20% by mass or less, more preferably 17% by mass or less, and further preferably 15% by mass or less of the fibrous activated carbon. .
  • the upper limit value of the amount of the amine compound attached to the activated carbon fiber layer 2 is this value, the cost can be suppressed while maintaining a sufficient radioactive substance removing effect.
  • the method of attaching the amine compound to the activated carbon fiber layer 2 includes a method of immersing and drying a sheet-like fibrous activated carbon in an amine compound solution, a method of spraying and drying the amine compound solution on a sheet-like fibrous activated carbon, Examples thereof include a method in which fibrous activated carbon is immersed in an amine compound solution and dried to form a sheet. Especially, it is preferable to make an amine compound adhere to the activated carbon fiber layer 2 by the method of immersing a sheet-like fibrous activated carbon in the solution of an amine compound, and drying. By attaching the amine compound to the activated carbon fiber layer 2 in this way, the amine compound can be uniformly attached to the fibrous activated carbon, and the radioactive substance removing effect of the activated carbon fiber layer 2 is enhanced.
  • the basis weight of the fibrous activated carbon in the activated carbon fiber layer 2 is preferably 150 g / m 2 or more, more preferably 200 g / m 2 or more, and further preferably 400 g / m 2 or more.
  • the basis weight of the fibrous activated carbon in the activated carbon fiber layer 2 is preferably 900 g / m 2 or less, more preferably 800 g / m 2 or less, and further preferably 700 g / m 2 or less.
  • the activated carbon particle layer 3 is a layer having granular activated carbon.
  • the granular activated carbon is a granular activated carbon obtained by performing an activation reaction by gas activation or chemical activation on carbonized palm shell, sawdust, bamboo or the like, coal, pitch or the like. Examples of the granular activated carbon include crushed charcoal, granular charcoal, and formed charcoal, and any type can be suitably used.
  • powdered activated carbon which is powdered activated carbon, can be used, but granular activated carbon is preferably used in order to reduce pressure loss.
  • the activated carbon particle layer 3 is obtained by mixing granular activated carbon and a thermoplastic resin, sandwiching the mixture between nonwoven fabrics, and performing a heat treatment.
  • the BET specific surface area of the granular activated carbon is preferably 800 m 2 / g or more, more preferably 900 m 2 / g or more, and further preferably 1000 m 2 / g or more.
  • the lower limit value of the BET specific surface area of the granular activated carbon is this value, the effect of the activated carbon particle layer 3 removing the organic solvent can be enhanced.
  • the total pore volume of the granular activated carbon is preferably 0.3 cc / g or more, more preferably 0.4 cc / g or more, and further preferably 0.5 cc / g or more.
  • the lower limit value of the total pore volume of the granular activated carbon is this value, the effect of removing the organic solvent from the activated carbon particle layer 3 is improved.
  • the average particle diameter of the granular activated carbon is preferably 200 ⁇ m or more, and more preferably 250 ⁇ m or more.
  • the air permeability of the activated carbon particle layer 3 can be improved.
  • the average particle diameter of the granular activated carbon is preferably 700 ⁇ m or less, more preferably 625 ⁇ m or less, and further preferably 550 ⁇ m or less.
  • the upper limit value of the average particle diameter of the granular activated carbon is such a value, the surface area of the activated carbon particle layer 3 is increased, and the efficiency of removing the organic solvent is improved.
  • the granular activated carbon is observed at a magnification of 35 times using an optical microscope, and the particle diameter is measured. Arbitrary 100 particle sizes are arithmetically averaged, and this average value is taken as the average particle size of the granular activated carbon.
  • the basis weight of the granular activated carbon in the activated carbon particle layer 3 is preferably 150 g / m 2 or more, more preferably 200 g / m 2 or more, and further preferably 250 g / m 2 or more.
  • the activated carbon particle layer 3 can have a sufficient organic solvent removing effect.
  • the basis weight of the granular activated carbon in the activated carbon particle layer 3 is preferably 900 g / m 2 or less, more preferably 800 g / m 2 or less, and further preferably 700 g / m 2 or less. Since the upper limit of the basis weight of the granular activated carbon in the activated carbon particle layer 3 is this value, the activated carbon particle layer 3 can be made lightweight and the pressure loss can be reduced.
  • the ratio of the amount of amine compound attached to the activated carbon particle layer 3 and the amount of amine compound attached to the activated carbon fiber layer 2 is: It is 0.1 or less, preferably 0.08 or less, and more preferably 0.06 or less.
  • the ratio of the amine compound adhesion amount of the activated carbon particle layer 3 and the amine compound adhesion amount of the activated carbon fiber layer 2 includes 0.
  • the ratio of the amine compound adhesion amount of the activated carbon particle layer 3 and the amine compound adhesion amount of the activated carbon fiber layer 2 is this value, the organic solvent in the gas is removed to the activated carbon particle layer 3 and the organic The solvent is prevented from adhering to the activated carbon fiber layer 2. Therefore, it is possible to suppress a decrease in the radioactive substance removal performance of the radioactive substance removal filter 1, and it is possible to extend the lifetime of the radioactive substance removal filter.
  • the activated carbon fiber layer 2 and the activated carbon particle layer 3 are preferably laminated in the thickness direction, and preferably have a pleated shape that is repeatedly folded and folded repeatedly. Since the activated carbon fiber layer 2 and the activated carbon particle layer 3 are laminated, the radioactive substance removal filter 1 can be downsized. In addition, since the activated carbon fiber layer 2 and the activated carbon particle layer 3 are pleated, the area in contact with the gas is increased, and the radioactive material in the gas can be efficiently removed.
  • the radioactive substance removal filter 1 according to the present invention can be used for the radioactive substance removal filter unit 11.
  • the radioactive substance removal filter unit 11 can be manufactured by housing the radioactive substance removal filter 1 in a frame 12 as an example of the embodiment.
  • the material of the frame 12 is not particularly limited, and examples thereof include metals, synthetic resins, and wood. Among these, a metal is preferable. Since the frame body 12 is made of metal, the strength of the radioactive substance removal filter unit 11 can be increased.
  • a gas containing a radioactive substance such as gaseous iodine or an organic iodine compound is passed through the radioactive substance removal filter 1 of the present invention.
  • a radioactive substance such as gaseous iodine or an organic iodine compound
  • the radioactive substance removal filter 1 of the present invention it becomes possible to remove radioactive substances from the gas.
  • an organic solvent is contained in the gas, the organic solvent is removed from the gas by the activated carbon particle layer 3 of the radioactive substance removal filter 1, so that the organic solvent does not easily adhere to the activated carbon fiber layer 2, and activated carbon. It can prevent that the radioactive substance removal performance of the fiber layer 2 falls.
  • An activated carbon fiber layer was prepared by laminating a spunlace made of polypropylene (weight per unit area: 35 g / m 2 ) on both sides of a sheet-like fibrous activated carbon or a laminate of a plurality of sheets and integrating them by needle punching. .
  • the prepared mixed powder was sprayed on a thermal bond nonwoven fabric (weighing 27 g / m 2 ), and the same thermal bond nonwoven fabric was superimposed thereon, followed by heat treatment to produce an activated carbon particle layer.
  • the surface area analysis range is set to 0.01 to 0.15 under the BET conditions, and the BET specific surface area [m 2 / g]. Further, the total pore volume [cc / g] was determined from the data of the relative pressure 0.95.
  • Example 1 625 mg of triethylenediamine (manufactured by Tokyo Chemical Industry Co., Ltd.) was dissolved in 250 g of ion-exchanged water to prepare a triethylenediamine aqueous solution.
  • Sheet of the fibrous activated carbon 6 g (BET specific surface area: 1460 m 2 / g, total pore volume: 0.63cc / g, basis weight: 200 g / m 2, average fiber diameter: 13 .mu.m), and the aqueous solution previously prepared After the addition, the mixture was stirred at room temperature for 12 hours. Thereafter, the sheet-like fibrous activated carbon was separated by filtration and dried at 80 ° C. for 2 hours.
  • a sheet-like amine compound-attached fibrous activated carbon having an amine compound adhesion amount of 10.3% by mass was obtained.
  • Three sheets of the obtained sheet-like amine compound-attached fibrous activated carbon were laminated to produce an activated carbon fiber layer.
  • Coconut shell granular activated carbon with an amine compound adhesion of 0% by mass (below the detection limit) (BET specific surface area: 1350 m 2 / g, total pore volume: 0.62 cc / g, particle diameter: 250 to 500 ⁇ m, average particle diameter: 320 ⁇ m ) was used to prepare an activated carbon particle layer so that the granular activated carbon basis weight was 600 g / m 2 .
  • the produced activated carbon particle layer was disposed on the upstream side, and the activated carbon fiber layer was disposed on the downstream side, and an organic solvent load test was performed. Then, the methyl iodide removal rate was measured using the sample after the organic solvent load test.
  • Example 2 An activated carbon fiber layer was produced in the same manner as in Example 1 except that the amount of triethylenediamine used was 1.88 g.
  • a triethylenediamine aqueous solution was prepared by dissolving 45 mg of triethylenediamine (manufactured by Tokyo Chemical Industry Co., Ltd.) in 8 g of ion-exchanged water. Further, 6 g of palm activated carbon activated carbon (BET specific surface area: 1350 m 2 / g, total pore volume: 0.62 cc / g, particle diameter: 250 to 500 ⁇ m, average particle diameter: 320 ⁇ m) was mixed with the previously prepared aqueous solution. Then, it was dried at 80 ° C. for 2 hours.
  • An amine compound-attached granular activated carbon having an amine compound adhesion amount of 0.7% by mass was obtained.
  • the activated carbon particle layer was produced using the obtained amine compound adhesion granular activated carbon so that granular activated carbon basis weight might be 600 g / m ⁇ 2 >.
  • the produced activated carbon particle layer was disposed on the upstream side, and the activated carbon fiber layer was disposed on the downstream side, and an organic solvent load test was performed. Then, the methyl iodide removal rate was measured using the sample after the organic solvent load test.
  • Example 3 The same operation as in Example 1 was conducted except that the amount of triethylenediamine used was 4.38 g. The amine compound adhesion amount was 14.8% by mass.
  • Example 4 The same procedure as in Example 1 was performed except that the activated carbon particle layer had a granular activated carbon basis weight of 300 g / m 2 .
  • Example 5 The same procedure as in Example 3 was performed except that the activated carbon particle layer had a granular activated carbon basis weight of 300 g / m 2 .
  • An amine compound-attached granular activated carbon having an amine compound adhesion amount of 12.1% by mass was obtained.
  • the activated carbon particle layer was produced using the obtained amine compound adhesion granular activated carbon so that granular activated carbon basis weight might be 300 g / m ⁇ 2 >.
  • the produced activated carbon particle layer was disposed on the upstream side, and the activated carbon fiber layer was disposed on the downstream side, and an organic solvent load test was performed. Then, the methyl iodide removal rate was measured using the sample after the organic solvent load test.
  • Example 2 An activated carbon particle layer and an activated carbon fiber layer were prepared in the same manner as in Example 5, the activated carbon fiber layer was disposed on the upstream side, the activated carbon particle layer was disposed on the downstream side, and an organic solvent load test was performed. Then, the methyl iodide removal rate was measured using the sample after the organic solvent load test.
  • Example 3 An activated carbon particle layer similar to that in Example 4 is disposed on the upstream side, and the activated carbon particle layer is disposed on the downstream side in the same manner as in Comparative Example 1 except that the granular activated carbon basis weight is 600 g / m 2. A load test was performed. Then, the methyl iodide removal rate was measured using the sample after the organic solvent load test.
  • the organic solvent in the gas can be removed only with the activated carbon particle layer. Instead, the organic solvent reaches the activated carbon fiber layer, and the organic solvent adheres to the activated carbon fiber layer. Therefore, the thing of the comparative example 1 compared with the thing of Example 5 which made the amine compound adhere only to the activated carbon fiber layer of the downstream, without attaching an amine compound to the activated carbon particle layer of the upstream, The removal effect of radioactive material is reduced. Therefore, it is preferable that the amine compound is not attached to the upstream layer, and the amine compound is attached only to the downstream layer.
  • the activated carbon fiber layer has better radioactive substance removal performance than the activated carbon particle layer.
  • the organic solvent in the gas adheres, and the radioactive substance removal performance of the activated carbon fiber layer decreases. Therefore, the comparative example 2 is less effective in removing the radioactive substance than the example 5 in which the activated carbon particle layer is disposed on the upstream side and the activated carbon fiber layer is disposed on the downstream side. Yes. Therefore, it is preferable that the activated carbon particle layer is disposed on the upstream side and the activated carbon fiber layer is disposed on the downstream side.
  • the radioactive substance removal performance is superior to the activated carbon particle layer. Since the activated carbon fiber layer is not used, the radioactive substance removal effect is reduced. Therefore, it is preferable to use both the activated carbon particle layer and the activated carbon fiber layer instead of using only the activated carbon particle layer.
  • the amine compound is attached to the downstream activated carbon particle layer, but compared to Examples 4 and 5 in which the amine compound is attached to the downstream activated carbon fiber layer, the radioactive compound is used.
  • the substance removal effect is reduced. Therefore, it is preferable to attach the amine compound to the activated carbon fiber layer rather than attaching the amine compound to the activated carbon particle layer.
  • the activated carbon fiber layer when the activated carbon fiber layer is disposed on both the upstream side and the downstream side, it is necessary to increase the basis weight of the activated carbon fiber layer in order to provide sufficient radioactive substance removal performance.
  • the basis weight of the activated carbon fiber layer is increased, the thickness increases, and the thickness of the radioactive substance removal filter also increases. As a result, there is a problem that the radioactive substance removing filter is enlarged and it is difficult to pleat the radioactive substance removing filter. Therefore, it is preferable to use both the activated carbon particle layer and the activated carbon fiber layer instead of using only the activated carbon fiber layer.
  • the radioactive substance removal filter of the present invention includes an activated carbon fiber layer on the downstream side and an activated carbon particle layer on the upstream side, and the activated carbon fiber layer has fibrous activated carbon to which an amine compound is attached,
  • the ratio of the amount of amine compound attached to the activated carbon particle layer to the amount of amine compound attached to the activated carbon fiber layer is 0.1 or less (0 Including).
  • Radioactive substance removal filter 2 Activated carbon fiber layer 3: Activated carbon particle layer 11: Radioactive substance removal filter unit 12: Frame

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PCT/JP2017/044560 2016-12-15 2017-12-12 放射性物質除去フィルタ、それを用いる放射性物質除去フィルタユニット及び放射性物質の除去方法 WO2018110547A1 (ja)

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CN201780077292.0A CN110073444B (zh) 2016-12-15 2017-12-12 放射性物质去除过滤器、使用其的放射性物质去除过滤器单元及放射性物质的去除方法
KR1020197012138A KR102526926B1 (ko) 2016-12-15 2017-12-12 방사성 물질 제거 필터, 그것을 사용하는 방사성 물질 제거 필터 유닛 및 방사성 물질의 제거 방법

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