JPH0219759Y2 - - Google Patents
Info
- Publication number
- JPH0219759Y2 JPH0219759Y2 JP1983003242U JP324283U JPH0219759Y2 JP H0219759 Y2 JPH0219759 Y2 JP H0219759Y2 JP 1983003242 U JP1983003242 U JP 1983003242U JP 324283 U JP324283 U JP 324283U JP H0219759 Y2 JPH0219759 Y2 JP H0219759Y2
- Authority
- JP
- Japan
- Prior art keywords
- activated carbon
- relative humidity
- carbon filter
- filter
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 84
- 238000009423 ventilation Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 230000002285 radioactive effect Effects 0.000 description 19
- 238000001179 sorption measurement Methods 0.000 description 18
- INQOMBQAUSQDDS-UHFFFAOYSA-N iodomethane Chemical compound IC INQOMBQAUSQDDS-UHFFFAOYSA-N 0.000 description 13
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052740 iodine Inorganic materials 0.000 description 2
- 239000011630 iodine Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000011882 ultra-fine particle Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011045 prefiltration Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Landscapes
- Separation Of Gases By Adsorption (AREA)
Description
【考案の詳細な説明】
原子力施設つまり原子力発電所の換気空調設備
には、気体中の放射性よう素、放射性よう化メチ
ル等の除去を目的とした活性炭フイルタ内蔵の気
体過装置が装備されており、通常運転時には、
前記設備内の空気には放射性よう素、放射性よう
化メチルが含まれていないため、同空気は前記気
体過装置に供給されず同装置は停止され、それ
らが混入された際に該気体過装置が作動される
ようになつている。[Detailed explanation of the invention] The ventilation and air conditioning equipment of nuclear facilities, that is, nuclear power plants, is equipped with a gas filtration device with a built-in activated carbon filter for the purpose of removing radioactive iodine, radioactive methyl iodide, etc. from the gas. , during normal operation,
Since the air in the facility does not contain radioactive iodine or radioactive methyl iodide, the air is not supplied to the gas filtration device and the device is stopped. is now being activated.
従来の前記気体過装置の一例を示すと、第１
図に示すようにフイルタ取替用出入口１ａを備え
たハウジング１内に、プレイフイルタ２（粗フイ
ルタ）、主フイルタ３（超微粒子フイルタ）、活性
炭消火用スプレー設備４、および多数の活性炭フ
イルタ５群の順に配設し、被処理気体は、排気ダ
クト６側に設けた図示外の排気フアンによつて通
気取入口１ｂ側から取入れられ、プレフイルタ２
と主フイルタ３により主に除塵、除湿され活性炭
フイルタ５によつて前記放射性よう素、放射性よ
う化メチル等が除去されたのち、通気取出口１ｃ
を経てダクト６から取出されるトレイ式の構造に
なつている。 An example of the conventional gas filtration device is as follows:
As shown in the figure, a play filter 2 (coarse filter), a main filter 3 (ultrafine particle filter), an activated carbon fire extinguishing spray equipment 4, and a large number of activated carbon filters 5 are housed in a housing 1 equipped with an entrance 1a for filter replacement. The gas to be treated is taken in from the ventilation intake port 1b side by an exhaust fan (not shown) provided on the exhaust duct 6 side, and the gas to be treated is taken in from the ventilation intake port 1b side.
After the main filter 3 mainly removes dust and dehumidification, and the activated carbon filter 5 removes the radioactive iodine, radioactive methyl iodide, etc., the ventilation outlet 1c
It has a tray-type structure that is taken out from the duct 6 through.
しかして、前記気体過装置においては、活性
炭フイルタ５による前記の吸着、除去効率を常に
高い値に保持しておく必要があり（いつ稼動して
も十分な性能を発揮できるようにするため）、原
子力発電所の定期点検毎に、前記活性炭フイルタ
の性能（除去効率）を代表サンプルで測定チエツ
クしている。また、この使用中の活性炭フイルタ
は、系統によつて異なるが１年毎に取替えるもの
から約10年近く取替基準値を満足し得る系統もあ
る。 Therefore, in the gas filtration device, it is necessary to always maintain the adsorption and removal efficiency of the activated carbon filter 5 at a high value (so that sufficient performance can be exhibited no matter when it is operated). At every periodic inspection of a nuclear power plant, the performance (removal efficiency) of the activated carbon filter is measured and checked using a representative sample. In addition, although the activated carbon filter in use varies depending on the system, there are systems that can satisfy the replacement standard value for about 10 years, ranging from those that are replaced every year.
さらに、前記気体過装置における活性炭フイ
ルタについて種々試験、検討した結果、活性炭は
一般に水分をよく吸着し、通気される空気の相対
湿度が増加すると水分吸着量（平衡吸着量）が大
幅に増大し（この傾向は温度に対して依存性がな
くその吸着量には大差がない。）、一方、活性炭の
放射性よう素、放射性よう化メチルの吸着性能
は、新品の活性炭については前記相対湿度に殆ん
ど影響されないが、使用中の活性炭については、
前記相対湿度が増加するとその吸着性能が著しく
低下される傾向を有し、前記相対湿度を適度に低
く保つとその活性炭の高吸着性能が持続されその
使用年数を延長できることが判明した。 Furthermore, as a result of various tests and studies on the activated carbon filter in the gas filtration device, activated carbon generally adsorbs moisture well, and as the relative humidity of the vented air increases, the amount of moisture adsorption (equilibrium adsorption amount) increases significantly ( (This tendency is not dependent on temperature, and there is no significant difference in the amount of adsorption.) On the other hand, the adsorption performance of activated carbon for radioactive iodine and radioactive methyl iodide is almost the same as the above-mentioned relative humidity for new activated carbon. However, regarding activated carbon in use,
It has been found that as the relative humidity increases, the adsorption performance tends to decrease significantly, and that by keeping the relative humidity moderately low, the high adsorption performance of the activated carbon can be maintained and its service life can be extended.
本案は、前記のような実情に鑑みて考案された
原子力施設用気体過装置であつて、活性炭フイ
ルタを内蔵し排気ダクト側に排気フアンを設けた
原子力施設用気体過装置において、通気取入口
内に加熱器を設け、前記活性炭フイルタの前面に
相対湿度検出器を設けるとともに、相対湿度検出
信号と通気量出力信号が入力され前記加熱器を調
節して前記活性炭フイルタ入口側における被処理
気体の相対湿度を40％前後に制御する制御器を設
けた点に特徴を有し、その目的とする処は、被処
理気体の温度を調節することによつて活性炭フイ
ルタ入口側の気体相対湿度を40％前後に制御する
ことにより、該活性炭フイルタによる水分吸着を
程よく制御し放射性よう素、放射性よう化メチル
等の吸着、除去性能を持続せしめその使用年数を
向上させた原子力施設用気体過装置を供する点
にある。 This proposal is a gas filtration system for nuclear facilities that was devised in view of the above-mentioned circumstances, and has a built-in activated carbon filter and an exhaust fan on the exhaust duct side. A relative humidity detector is provided in front of the activated carbon filter, and a relative humidity detection signal and an aeration amount output signal are inputted to adjust the heater to adjust the relative humidity of the gas to be treated at the inlet side of the activated carbon filter. The feature is that it is equipped with a controller that controls the humidity to around 40%, and its purpose is to control the gas relative humidity at the activated carbon filter inlet side to 40% by adjusting the temperature of the gas to be treated. To provide a gas filtration device for a nuclear facility, in which the moisture adsorption by the activated carbon filter is moderately controlled by back-and-forth control, and the adsorption and removal performance of radioactive iodine, radioactive methyl iodide, etc. is sustained, and its service life is increased. It is in.
本案は、前記した構成になつており、活性炭フ
イルタの前面に設けた相対湿度検出器による相対
湿度検出信号とフアンのフアン出力信号つまり通
気量信号が入力される制御器によつて通気取入口
内の加熱器が調節され、被処理気体の温度調節に
より活性炭フイルタ入口側における被処理気体の
相対湿度が40％前後に制御されるため、該活性炭
フイルタによる水分吸着性能が程よく抑制される
とともに、放射性よう素、放射性よう化メチル等
の吸着、除去性能が高効率に持続され、活性炭の
使用年数が著しく増加され、過性能、信頼性が
著しく向上される。 The present invention has the above-mentioned configuration, and the air intake is controlled by a controller into which the relative humidity detection signal from the relative humidity detector installed in front of the activated carbon filter and the fan output signal, that is, the ventilation amount signal, are input. The heater is adjusted, and the relative humidity of the gas to be treated at the inlet side of the activated carbon filter is controlled to around 40% by adjusting the temperature of the gas to be treated, so that the moisture adsorption performance of the activated carbon filter is moderately suppressed, and the radioactivity is The adsorption and removal performance of iodine, radioactive methyl iodide, etc. is maintained at high efficiency, the service life of activated carbon is significantly increased, and the performance and reliability are significantly improved.
以下、本案の実施例を図示について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第２図に本案の一実施例を示しており、図中１
はフイルタ取替用出入口１ａ，１ａを有するハウ
ジング、１ｂ，１ｃはハウジング１の通気取入口
と通気取出口、２はプレフイルタ（粗フイルタ）、
３は主フイルタ（超微粒子フイルタ）、４は活性
炭消火用スプレー設備、５は多数の活性炭フイル
タ群、６は排気ダクト、７は排気フアンであつ
て、該実施例においては、通気取入口１ｂ内に加
熱器、具体的には空気加温ヒータ１０（電気また
は蒸気ヒータ）を設け、活性炭フイルタ５の前面
側に相対湿度検出器、具体的には相対湿度センサ
１１（湿度検出センサを内蔵）を設けるととも
に、さらに、相対湿度検出信号１１ａと排気フア
ン出力信号７ａが入力され、前記空気加温ヒータ
１０を自動的に調節して被処理気体の温度を調節
し、活性炭フイルタ５入側の同気体の相対湿度を
40％前後に制御する制御器１２を設けた構成にな
つており、また、前記制御器１２は、排気フアン
７を運転して活性炭フイルタ５群に通気を開始
し、同時に空気加温ヒータ１０を作動させると、
相対湿度センサ１１からの相対湿度検出信号１１
ａと排気フアン７からのフアン出力信号つまり通
気量信号７ａが入力され、空気加温ヒータ１０を
オン、オフ制御により調節し被処理気体の温度を
調節して、活性炭フイルタ５入側の被処理気体の
相対湿度を常に40％前後（具体的には30〜50％）
に維持（特に通気開始直後は急速に相対湿度を下
げることになる）する構成になつており、具体的
には自動制御パネルが用いられる。（この制御器
は公知技術によつて適宜実施可能であり、その詳
細は省略する）
図示した実施例は、前記のような構成になつて
おり、その作用効果について詳述すると、活性炭
の相対湿度に対する水分吸着量と放射性よう化メ
チルの除去効率との関係は第３図に示すようにな
り、活性炭は、その活性度、細孔分布、細孔容
積、比表面積などの違いにより多少の異なりがあ
るが、一般的に水分平衡吸着において図示のＡ，
A′，Ｃのような吸着曲線を示す特性があり、Ｂ
はＡの脱着曲線を示したものであつて、これらの
傾向は活性炭に顕著に見られる特性であり、その
隔差も先の特性項目により異なるが必ず脱着曲線
が吸着曲線を上回る。この特性曲線に見られるよ
うに水分吸着量が増大するのが相対湿度50％以上
であり、その変曲点が40％近辺である。一方、同
図のＤ〜Ｇ（サンプル記号）の曲線は、相対湿度
と放射性よう化メチルの除去効率との関係を示し
たもので、新品の活性炭Ｄは殆んど相対湿度によ
る影響は見られないが、使用中の活性炭フイルタ
の活性炭Ｅ，Ｆ，Ｇでは特有な曲線を示し、その
変曲点は相対湿度50％近辺に現われる。この事は
活性炭の水分吸着量と直接的な関係があり、活性
炭フイルタの放射性よう化メチルの除去効率改善
の有力な手段となり得る。とくに使用後数年経過
した活性炭フイルタは曲線Ｅ，Ｆ，Ｇに示すよう
に相対湿度40％以下での放射性よう化メチル除去
効率80％RHに比べ著しく高い値を示す。除去効
率が高い値でその取替え基準値を上回つて維持さ
れることにより、活性炭フイルタの使用期間が大
幅に延長され、そのフイルタの購入価格を初め、
取替費用などの削減による経済的効果も大きく、
また、万一発生した場合の放射性よう化メチルの
大気への放出量軽減による安全性維持に効果を発
揮する。 Figure 2 shows an example of the present invention.
1b and 1c are housings having filter replacement openings 1a and 1a, 1b and 1c are ventilation inlets and ventilation outlets of housing 1, 2 is a pre-filter (rough filter),
3 is a main filter (ultrafine particle filter), 4 is activated carbon fire extinguishing spray equipment, 5 is a large group of activated carbon filters, 6 is an exhaust duct, and 7 is an exhaust fan, which in this embodiment is installed in the ventilation intake port 1b. A heater, specifically, an air heater 10 (electric or steam heater) is provided, and a relative humidity detector, specifically a relative humidity sensor 11 (with a built-in humidity detection sensor), is provided on the front side of the activated carbon filter 5. In addition, a relative humidity detection signal 11a and an exhaust fan output signal 7a are input, and the air heater 10 is automatically adjusted to adjust the temperature of the gas to be treated, and the same gas on the inlet side of the activated carbon filter 5 is relative humidity of
The controller 12 operates the exhaust fan 7 to start ventilation to the activated carbon filter 5 group, and at the same time starts the air heating heater 10. When activated,
Relative humidity detection signal 11 from relative humidity sensor 11
a and the fan output signal from the exhaust fan 7, that is, the ventilation amount signal 7a, are input, and the air heating heater 10 is controlled by on/off control to adjust the temperature of the gas to be treated, and the temperature of the gas to be treated at the inlet side of the activated carbon filter 5 is adjusted. Always keep the relative humidity of the gas around 40% (specifically 30-50%)
(particularly immediately after the start of ventilation, the relative humidity is rapidly lowered), and specifically an automatic control panel is used. (This controller can be implemented as appropriate using known technology, and its details will be omitted.) The illustrated embodiment has the above-mentioned configuration, and its effects will be explained in detail. Figure 3 shows the relationship between the amount of moisture adsorbed to the water and the removal efficiency of radioactive methyl iodide.Activated carbon differs slightly depending on its activity, pore distribution, pore volume, specific surface area, etc. However, in general, in water equilibrium adsorption, A,
It has characteristics that show adsorption curves like A' and C, and B
shows the desorption curve of A. These trends are characteristics that are noticeable in activated carbon, and the difference between them varies depending on the above characteristic items, but the desorption curve always exceeds the adsorption curve. As seen in this characteristic curve, the amount of water adsorption increases at relative humidity of 50% or higher, and the inflection point is around 40%. On the other hand, the curves D to G (sample symbols) in the same figure show the relationship between relative humidity and radioactive methyl iodide removal efficiency, and new activated carbon D shows almost no influence from relative humidity. However, activated carbon filters E, F, and G in use show a unique curve, and the inflection point appears near 50% relative humidity. This has a direct relationship with the amount of moisture adsorbed by activated carbon, and can be an effective means of improving the removal efficiency of radioactive methyl iodide in activated carbon filters. In particular, activated carbon filters that have been used for several years show significantly higher radioactive methyl iodide removal efficiency than 80% RH at relative humidity of 40% or less, as shown by curves E, F, and G. By maintaining the removal efficiency at a high value and exceeding its replacement standard value, the service life of the activated carbon filter is significantly extended, and the purchase price of the filter is reduced.
There are also significant economic effects due to reductions in replacement costs, etc.
It is also effective in maintaining safety by reducing the amount of radioactive methyl iodide released into the atmosphere in the event of an outbreak.
よつて、前記実施例によれば、活性炭フイルタ
による水分吸着性能が程よく抑制され、放射性よ
う素、放射性よう化メチル等の吸着、除去性能が
高効率に持続されることになり、活性炭の使用年
数が著しく増加される。 Therefore, according to the above embodiment, the water adsorption performance of the activated carbon filter is moderately suppressed, and the adsorption and removal performance of radioactive iodine, radioactive methyl iodide, etc. is maintained with high efficiency, and the activated carbon filter can be used for many years. is significantly increased.
なお、前記実施例はトレイ式フイルタについて
説明したが充填式フイルタについても同様に適用
可能である。 Incidentally, although the above embodiment has been described with respect to a tray type filter, it is also applicable to a filling type filter.
第１図は従来の原子力施設用気体過装置を示
す縦断面図、第２図は本案の一実施例を示す縦断
面図、第３図は相対湿度と水分吸着量、放射性よ
う化メチル除去効率との関係図である。
５：活性炭フイルタ、６：排気ダクト、７：排
気フアン、７ａ：フアン出力信号、１０：加熱
器、１１：相対湿度検出器、１１ａ：相対湿度検
出信号、１２：制御器。
Figure 1 is a vertical cross-sectional view showing a conventional gas filtration system for nuclear facilities, Figure 2 is a vertical cross-sectional view showing an embodiment of the present invention, and Figure 3 is relative humidity, water adsorption amount, and radioactive methyl iodide removal efficiency. FIG. 5: activated carbon filter, 6: exhaust duct, 7: exhaust fan, 7a: fan output signal, 10: heater, 11: relative humidity detector, 11a: relative humidity detection signal, 12: controller.
Claims (1)
アンを設けた原子力施設用気体過装置におい
て、通気取入口内に加熱器を設け、前記活性炭フ
イルタの前面に相対湿度検出器を設けるととも
に、相対湿度検出信号と通気量出力信号が入力さ
れ前記加熱器を調節して前記活性炭フイルタ入口
側における被処理気体の相対湿度を40％前後に制
御する制御器を設けたことを特徴とする原子力施
設用気体過装置。 In a gas filtration system for nuclear facilities that has a built-in activated carbon filter and an exhaust fan on the exhaust duct side, a heater is installed in the ventilation intake, a relative humidity detector is installed in front of the activated carbon filter, and a relative humidity detection signal is provided. A gas filtration system for a nuclear facility, characterized in that the controller is provided with a controller that receives an output signal of ventilation amount and adjusts the heater to control the relative humidity of the gas to be treated at the inlet side of the activated carbon filter to around 40%. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP324283U JPS59110000U (en) | 1983-01-17 | 1983-01-17 | Gas filtration equipment for nuclear facilities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP324283U JPS59110000U (en) | 1983-01-17 | 1983-01-17 | Gas filtration equipment for nuclear facilities |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59110000U JPS59110000U (en) | 1984-07-24 |
| JPH0219759Y2 true JPH0219759Y2 (en) | 1990-05-30 |
Family
ID=30134867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP324283U Granted JPS59110000U (en) | 1983-01-17 | 1983-01-17 | Gas filtration equipment for nuclear facilities |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59110000U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5395879A (en) * | 1977-02-02 | 1978-08-22 | Hitachi Ltd | Operating method for silver-adsorbent filter |
-
1983
- 1983-01-17 JP JP324283U patent/JPS59110000U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5395879A (en) * | 1977-02-02 | 1978-08-22 | Hitachi Ltd | Operating method for silver-adsorbent filter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59110000U (en) | 1984-07-24 |
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