JPS6067896A - Method of washing piping - Google Patents
Method of washing pipingInfo
- Publication number
- JPS6067896A JPS6067896A JP58175213A JP17521383A JPS6067896A JP S6067896 A JPS6067896 A JP S6067896A JP 58175213 A JP58175213 A JP 58175213A JP 17521383 A JP17521383 A JP 17521383A JP S6067896 A JPS6067896 A JP S6067896A
- Authority
- JP
- Japan
- Prior art keywords
- cleaning
- piping
- air
- flow
- liquid
- 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.)
- Granted
Links
Landscapes
- Cleaning In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は原子力発磁所、核燃料再処理工場等で使用され
ている放射性流体が流れる配管の洗浄方〔発明の技術的
背景とその問題点〕
原子力発電所や核燃料再処理工場では放射性流体を扱っ
ているので、これらの施設で使用している配管には、放
射性物質が付着し、線量が高くなっている。そこで配管
を定期的１二洗浄して放射能を除去することが行なわれ
ている。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for cleaning piping through which radioactive fluid flows, which is used in nuclear power plants, nuclear fuel reprocessing plants, etc. [Technical background of the invention and its problems] Nuclear power plants and nuclear fuel reprocessing plants handle radioactive fluids, so the piping used in these facilities is contaminated with radioactive materials, resulting in high radiation doses. Therefore, pipes are periodically cleaned to remove radioactivity.
これら配管の洗浄方法としては従来いろいろな方法が試
みられているが、大別して化学的除染法と機械的除染法
がある。化学的除染法は化学薬剤を用いて放射性物質を
溶解して除染する方法であシ、機械的除染法は超音波、
ブラシ、ビグ等を用いる方法、空気気泡混入流動洗浄、
ジェット洗浄、サンドブラスト洗浄などである。Various methods have been tried in the past to clean these pipes, and they can be roughly divided into chemical decontamination methods and mechanical decontamination methods. Chemical decontamination methods use chemical agents to dissolve and decontaminate radioactive materials, while mechanical decontamination methods use ultrasound,
Method using brush, vig, etc., fluid cleaning with air bubbles mixed in,
These include jet cleaning and sandblasting cleaning.
いま、配ｇ を二付着する放射性物質の形態について述
べると、次のようなものがある。Now, if we talk about the forms of radioactive substances that attach two groups, there are the following.
■ 配管表面の耐食性酸化皮膜（ヌテンレス管。■ Corrosion-resistant oxide film on the surface of the pipe (nutenless pipe).
炭素＠管）の組成の中に入多込んで皮膜と一体托してい
る場合。この場合は放射性物質の存在は皮膜の厚さだけ
であり、物質量としては少な■ 配管の粗面の谷部に放
射性物質粒子がはまり込んでいる場合。When carbon is incorporated into the composition of the tube and is integrated with the coating. In this case, the radioactive material exists only in the thickness of the coating, and the amount of the material is small ■ When radioactive material particles are stuck in the valleys of the rough surface of the pipe.
■ 配管表面（−スケールないしは付着（静電引力ファ
ンデルワールスカ、粘着力によシ）シている場合。■ If there is scale or adhesion (due to electrostatic attraction van der Waalska or adhesive force) on the piping surface.
■ 配管の錆の層の中（二はまり込んでいる場合。■ In the layer of rust on the pipes (if they are stuck).
■ 配管の底の部分（二堆積している場合。■ Bottom part of the pipe (if there are two piles).
■ 配管の隙間（二人シ込んでいる場合。■ Gap between piping (when two people are in the room).
化学的除染法では上記の■および■の場合（二効果があ
るが、その他の場合（二は涜莱吻量が多くなるか、ある
いは溶解せず（二残留するので、適さない。一方、機械
的除染法では、放射１生物質が堆積。Chemical decontamination methods are effective in the above cases (2) and (2), but in other cases (2), the amount of decontamination increases, or it does not dissolve (2), so it is not suitable.On the other hand, Mechanical decontamination methods deposit radiation 1 biological materials.
付着している場合、錆の層の中（二人っている場合など
（−は効果がろるが、酸化皮膜の中（二とり込まれてい
るものは除去できない。また油よごれや硬いスケールと
なって付着しているもの、粗面の谷や隙間（二人ったも
のあるいは再付着しやすいものは機械的除染法のみでは
成功せず、化学除染剤と併用した方が成功する場合が多
い。If it is stuck, inside the rust layer (for example, if there are two people) - is less effective, but inside the oxide film (2) If it is stuck, it cannot be removed. Mechanical decontamination alone will not be successful for items that are stuck together, valleys and crevices in rough surfaces (those that are stuck together, or items that are likely to re-adhere), and are more successful when used in combination with chemical decontamination agents. There are many cases.
また機械的除染法は一般に放射能汚染を拡げることが多
く、さら（二、装置が大きくなること、遠隔操作しく二
くいため放射線被曝を受けやすいこと、配管の構造等（
＝制約を受けやすいこと等の不利な点が多い。これらの
ことから機械的除染法は一般化せず、化学的除染法と併
用して両者の長所をとり入れることが望まれる。In addition, mechanical decontamination methods generally tend to spread radioactive contamination, and (2) the equipment is large, cannot be operated remotely, is susceptible to radiation exposure, and the structure of the piping, etc.
= There are many disadvantages such as being easily subject to restrictions. For these reasons, it is desirable that mechanical decontamination methods not be generalized, but rather that they be used in combination with chemical decontamination methods to take advantage of the advantages of both methods.
機械的除染法の中では、ウォーターフラッシング法が化
学的除染法と併用しやすい。ウォーターフラッシング法
とは、水と空気とを混合機でよく攪拌し、気液混相流と
して配管中を流す方法であって、その乱流効果（二より
堆積物およびソフト付着物（スラッジ、スライムおよび
ソフトスケール）を除去するものである。液として薬液
を使用すれば化学的除染法の長所をとシ入れることがで
きる。Among mechanical decontamination methods, the water flushing method is easy to use in combination with chemical decontamination methods. The water flushing method is a method in which water and air are thoroughly stirred in a mixer and flowed through piping as a gas-liquid multiphase flow. If a chemical solution is used as the liquid, the advantages of chemical decontamination methods can be combined.
本発明の目的は、放射性流体の流れる配管の洗浄方法Ｃ
−おいて、従来のウォーターフラッシング法全改良し、
よシ効果的（−配管の洗浄を行なうことである。The purpose of the present invention is to provide a method C for cleaning piping through which radioactive fluid flows.
- completely improved the conventional water flushing method,
Very effective (- cleaning the pipes).
従来のウォーターフラッシング法Ｃ二よる配管の洗浄を
詳細に調べてみると、空気と水とを予め混合して管内に
送入しても、数ｍも流れると気泡が分離して、流速が不
十分であると気泡が上方（二たまシ、そのまま流れるこ
とがわかった。すなわち気液混相流は安定して流れてい
るわけではない。A detailed investigation of pipe cleaning using the conventional water flushing method C2 reveals that even if air and water are mixed in advance and sent into the pipe, bubbles separate after several meters of flow and the flow rate remains constant. It was found that if the flow rate is sufficient, the bubbles will continue to flow upwards.In other words, the gas-liquid multiphase flow does not flow stably.
さらにテストしてみると、スラッジ、スライムをまい上
げる効果は、気相と水相の境界面が通過する際（二大き
く、細かい気泡が入っている流れよシも、大きな気泡が
管内の径いっばい（ニなっているような流れの方が効果
が大きいこともわかった。Further tests revealed that the effect of throwing up sludge and slime is that when the interface between the gas phase and the water phase passes (2. It was also found that the effect is greater when the flow looks like a ``Bye''.
また、気液混相の混合状態（二ついてさら（二詳細（−
調べると、水平管の場合はプラグ流およびスラグ流が効
果が大きく、垂直管の場合はスラグ流、およびフロス流
がよいことがわかった。そして気体および液体のプラグ
流、スラグ流、フロス流Ｃ二おいて、気体のホールドア
ツプ量が多い場合は、圧力損失が小さいので、ウォータ
ープラグの流速を大きくすることができ、スラッジ等の
搬送能力をす衣ζすふととガできるという利点本判明し
た。In addition, the mixed state of gas-liquid multiphase (two details (-
Upon investigation, it was found that plug flow and slug flow are most effective for horizontal pipes, while slug flow and froth flow are better for vertical pipes. In the gas and liquid plug flow, slag flow, and froth flow C2, when the amount of gas hold-up is large, the pressure loss is small, so the flow velocity of the water plug can be increased, and the conveyance capacity of sludge, etc. It turns out that there is an advantage of being able to wear clothes and sleep.
これらの調査結果から判断して、従来のよう１＝気、液
を管内送入前に予め攪拌混合することは不要であシ、む
しろ気、液を交互（二任意の間隔で配管内へ高圧高速で
送入した方が種々の点で効果的であることがわかった。Judging from these survey results, it is unnecessary to stir and mix air and liquid in advance before feeding them into the pipe as in the past; It has been found that feeding at high speed is more effective in various respects.
すなわち、本発明は、洗浄薬液と空気とを交互（−任意
の間隔で配管中へ圧入することを特徴とする放射性流体
用配管の洗浄方法（二関する。That is, the present invention relates to a method for cleaning radioactive fluid piping, characterized in that a cleaning chemical solution and air are alternately (-) pressurized into the piping at arbitrary intervals.
上記（＝おいて洗浄薬液と望気の送入間隔は、ウォータ
ープラグの長さが管径の１０倍以上、気柱の長さが管径
の１０倍以上になるようにすると効果的である。In the above (=), it is effective to set the interval between cleaning chemicals and desired air so that the length of the water plug is at least 10 times the pipe diameter and the length of the air column is at least 10 times the pipe diameter. .
また、洗浄薬液は水でもよいし、従来洗浄薬液として使
用されていた硫酸、修酸、クエン酸、スルファミノ酸等
、洗浄効果が期待されるものであればいかなるものでも
よい。ただし発泡性のものは好ましくない。Further, the cleaning chemical solution may be water, or any chemical that is expected to have a cleaning effect, such as sulfuric acid, oxalic acid, citric acid, and sulfamino acid, which have been conventionally used as cleaning chemicals. However, foaming materials are not preferred.
図面を参照して本発明の一実施例を説明する。 An embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の洗浄方法の一例を示すフローシートで
ある。薬液タンク１と圧縮空気タンク２とを別々に用意
し、洗浄すべき配管５へ薬液を液送ポンプ３によυチェ
ック弁４を経て一定流速で送入する。薬液が配管５内に
一定流速で流れること（二より、スケールおよびスラッ
チ類の溶解、軟化１分散が成程度生ずる。ここで高圧圧
縮空気を配管（二圧入してウォータープラグとかなり長
い気柱とを形成させる。空気量と空気送入時間は弁で調
節し、一方薬液はこの空気流が流れること（二より自動
的（′−チェック弁（二よりストップする。FIG. 1 is a flow sheet showing an example of the cleaning method of the present invention. A chemical tank 1 and a compressed air tank 2 are prepared separately, and the chemical liquid is fed into the piping 5 to be cleaned at a constant flow rate by a liquid feed pump 3 via a check valve 4. The chemical solution flows at a constant flow rate into the piping 5 (from the second, dissolution of scale and slatch, and a certain degree of softening and dispersion occur).Here, high-pressure compressed air is injected into the piping (two) to create a water plug and a fairly long air column. The amount of air and the air supply time are adjusted by a valve, while the air flow for the chemical solution is automatically controlled by the check valve (stops by the check valve).
このよう（−シて薬液と空気流とを交互に遍当な間隔を
おいて配管中を流すこと（二よυ、スラッジ類をまい上
げ、高速で搬送する。In this way, the chemical solution and air flow are alternately flowed through the piping at even intervals (2, υ, sludge is thrown up and transported at high speed.
配管より出た薬液、空気、スラッジ類はサイクロン６（
二人シ、ここで薬液とスラッジ類が気流力ら分離される
。次に−イドロクロン７（二よりスラッジ類が薬液と分
離され、スラッジタンク８に貯−蔵される。薬液はサー
ジタンク９を経て返送ポンプ１０（＝より鞘液タンク１
へ戻され、再使用される。Chemicals, air, and sludge coming out of the pipes are collected in cyclone 6 (
At this point, the chemical solution and sludge are separated from each other by the airflow force. Next, the sludge is separated from the chemical solution by the idroclone 7 (2) and stored in the sludge tank 8.
returned to the factory and reused.
サイクロン６で分離された気流はサイレンサー１１を介
して排気系に接続し、必要があればさら（二高性能のフ
ィルターないしサイクロンを通して排気系（二接続され
る。 −
〔発明の効果〕
本発明の洗浄法（二よれば、配管（二堆積、付看してい
るスラッジ、スジイム、ソフトスケールの剥離を効果的
に行なうことができ、また、ウォータープラグの間隔を
犬きくとることにょｐ気柱を長くし、それによシ圧力損
失を小さくすることができる。そのため同一圧での流速
が太きくなシ、剥離したスラッジ等の搬送能力が大きく
なる。The airflow separated by the cyclone 6 is connected to the exhaust system via the silencer 11, and if necessary, is further connected to the exhaust system through two high-performance filters or cyclones. According to the method (2), it is possible to effectively remove sludge, sludge, and soft scale that are deposited in piping (2), and to lengthen the air column by keeping the distance between the water plugs close. As a result, the pressure loss can be reduced.Therefore, the flow velocity is not high at the same pressure, and the conveyance capacity for exfoliated sludge, etc. is increased.
また、放射性物質がスラッジ、クラッド等の状態で除去
されるので薬液の消費量が少なく、したがって二次廃粱
物置の発生も少なくてすむ。Furthermore, since radioactive substances are removed in the form of sludge, crud, etc., the amount of chemical solution consumed is small, and therefore the generation of secondary waste storage is also reduced.
さらに、本発明の方法は気、液を予め攪拌混合する必要
がないので、装置が簡単である。気体。Furthermore, since the method of the present invention does not require stirring and mixing air and liquid in advance, the apparatus is simple. gas.
流体の量１間隔等はすべて弁の調節のみで簡単に行なう
ことができる。そして、いかなる構造の配管（二も適用
することができる。The amount of fluid, such as one interval, can be easily adjusted by simply adjusting the valve. And any structure of piping (2) can be applied.
さら（＝従来のウォーターフラッシング法と異なって気
液混相流ではないので、界面活性剤等Ｃ二よる泡立ちが
少なく、そのためスラッジ類を分離することが容易であ
る。Furthermore, unlike the conventional water flushing method, it is not a gas-liquid multiphase flow, so there is less foaming due to C2 such as surfactants, and therefore it is easy to separate sludge.
さら（二、遠隔操作が容易なので、放射能被曝のおそれ
がない。(2) Since remote control is easy, there is no risk of radiation exposure.
第１図は本発明の一実施例を示すフローシートである。
１・・・薬液タンク、 ２・・・圧縮空気タンク３・・
・液送ポンプ、 ４・・・チェック弁５・・・自己管、
６・・・サイクロン７・・・ハイドロクロン、８・・
・スラッジタンク９・・・サージタンク、 １０・・・
返送ポンプ１１・・・サイレンサー
（８７３３）代理人 弁理士 猪 股 祥 晃（ほか１
名）第１頁の続き
０発 明 者 吉 川 潤
＠発 明 者 関 秀 司
＠発 明 者 菊 地 章
用崎市用崎市浮島町４番１号 日本原子力事業株式会社
研究所内
川崎市川崎市浮島町４番１号 日本原子力事業株式会社
研究所内
東京都千代田区内幸町１の１の６ 東京芝浦電気株式会
社東京事務所内FIG. 1 is a flow sheet showing one embodiment of the present invention. 1... Chemical solution tank, 2... Compressed air tank 3...
・Liquid feed pump, 4...Check valve 5...Self pipe,
6...Cyclone 7...Hydrochron, 8...
・Sludge tank 9...surge tank, 10...
Return pump 11... Silencer (8733) Agent Patent attorney Yoshiaki Inomata (and 1 others)
Name) Continued from page 1 0 Inventor Jun Yoshikawa @ Inventor Shuji Seki @ Inventor Akira Kikuchi 4-1 Ukishima-cho, Yosaki-shi, Yosaki-shi Japan Atomic Energy Corporation Research Institute Kawasaki, Kawasaki-shi 4-1 Ukishima-cho, Japan Japan Atomic Energy Works, Ltd. Research Center 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Tokyo Shibaura Electric Co., Ltd. Tokyo Office
Claims (4)
へ圧入することを特徴とする放射性流体用配管の洗浄方
法。(1) A method for cleaning radioactive fluid piping, characterized in that cleaning liquid and air are alternately (2) pressurized into the piping at arbitrary intervals.
管径の１０倍以上、気柱の長さが管径の１０倍以上とな
るような間隔である特許請求の範囲第１項記載の放射性
流体用配管の洗浄方法。(2) The interval between cleaning liquid and air is such that the length of the liquid plug is at least 10 times the diameter of the pipe, and the length of the air column is at least 10 times the diameter of the pipe. The method for cleaning radioactive fluid piping according to item 1.
射性流体用配管の洗浄方法。(3) The method for cleaning radioactive fluid piping according to claim 1, wherein the cleaning liquid is water.
項記載の放射性流体用配管の洗浄方法。(4) Claim 1 in which the cleaning liquid is a chemical cleaning solution
Method for cleaning radioactive fluid piping described in Section 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58175213A JPH0658435B2 (en) | 1983-09-24 | 1983-09-24 | How to clean the piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58175213A JPH0658435B2 (en) | 1983-09-24 | 1983-09-24 | How to clean the piping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6067896A true JPS6067896A (en) | 1985-04-18 |
| JPH0658435B2 JPH0658435B2 (en) | 1994-08-03 |
Family
ID=15992269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58175213A Expired - Lifetime JPH0658435B2 (en) | 1983-09-24 | 1983-09-24 | How to clean the piping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0658435B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63149290U (en) * | 1987-03-20 | 1988-09-30 | ||
| US6484736B1 (en) | 2000-07-24 | 2002-11-26 | Seiwa Pro Co., Ltd. | Method and apparatus for cleaning drainpipes in movable equipment |
| JP2007534454A (en) * | 2003-06-18 | 2007-11-29 | プリンストン トレード アンド テクノロジー インコーポレイテッド | Apparatus and method for cleaning pipelines, tubes and membranes using a two-phase flow |
| US9492853B2 (en) | 2008-09-30 | 2016-11-15 | Olympus Corporation | Method for composition for cleaning tubular systems employing moving three-phase lines |
-
1983
- 1983-09-24 JP JP58175213A patent/JPH0658435B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63149290U (en) * | 1987-03-20 | 1988-09-30 | ||
| US6484736B1 (en) | 2000-07-24 | 2002-11-26 | Seiwa Pro Co., Ltd. | Method and apparatus for cleaning drainpipes in movable equipment |
| JP2007534454A (en) * | 2003-06-18 | 2007-11-29 | プリンストン トレード アンド テクノロジー インコーポレイテッド | Apparatus and method for cleaning pipelines, tubes and membranes using a two-phase flow |
| JP4846574B2 (en) * | 2003-06-18 | 2011-12-28 | プリンストン トレード アンド テクノロジー インコーポレイテッド | Apparatus and method for cleaning pipelines, tubes and membranes using a two-phase flow |
| US9492853B2 (en) | 2008-09-30 | 2016-11-15 | Olympus Corporation | Method for composition for cleaning tubular systems employing moving three-phase lines |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0658435B2 (en) | 1994-08-03 |
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