JP2787185B2 - Slime adhesion prevention method for seawater piping - Google Patents
Slime adhesion prevention method for seawater pipingInfo
- Publication number
- JP2787185B2 JP2787185B2 JP5098949A JP9894993A JP2787185B2 JP 2787185 B2 JP2787185 B2 JP 2787185B2 JP 5098949 A JP5098949 A JP 5098949A JP 9894993 A JP9894993 A JP 9894993A JP 2787185 B2 JP2787185 B2 JP 2787185B2
- Authority
- JP
- Japan
- Prior art keywords
- seawater
- oxidant
- ozone
- slime
- piping
- 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 - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、天然海水を使用する
冷却装置等の配管に見られる海洋性微生物に起因するス
ライムの付着を防止する方法に係り、小型のオゾン発生
設備を用いて連続的に天然海水にオゾンを吹き込み生成
させオキシダント濃度を上昇させたオキシダント含有海
水を間欠的に海水配管に注入してスライムの付着を防止
する海水配管のスライム付着防止法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing slime from adhering to marine microorganisms found in piping of a cooling device or the like using natural seawater, and relates to a small-sized ozone generator.
The present invention relates to a method for preventing slime from adhering to seawater pipes by intermittently injecting oxidant-containing seawater having an oxidant concentration increased by continuously blowing ozone into natural seawater using equipment to prevent slime from adhering.
【０００２】[0002]
【従来の技術】天然海水を使用する船舶冷却装置、陸上
の火力発電所の冷却装置、あるいはＬＮＧ（液化天然ガ
ス）基地でのＬＮＧ気化装置等では、海水を冷媒又は熱
媒体として利用するため、種々の海水配管が配置されて
いる。この海水配管において、フジツボなどの付着成長
に因る配管閉塞等の生物障害やスライム生成が大きな問
題として取り上げられているスライム生成とは海洋性微
生物のバクテリアの成育にともない、熱交換効率の低下
や管断面積の減少を起こしたりするもので、さらに、配
管腐食や錆コブの生成、土砂や錆びを取り込んで固まり
で剥離するなどの種々の問題を発生させる。2. Description of the Related Art A ship cooling system using natural seawater, a cooling system for a thermal power plant on land, or an LNG vaporizer at an LNG (liquefied natural gas) base uses seawater as a refrigerant or a heat medium. Various seawater pipes are arranged. In this seawater piping, biological obstacles such as pipe blockage due to adhesion growth of barnacles and slime generation are taken up as a major problem.Slime generation is a problem with the growth of bacteria of marine microorganisms. It causes a reduction in the cross-sectional area of the pipe, and further causes various problems such as corrosion of the pipe, generation of rust bumps, and sediment and rust that are taken off and separated by a lump.
【０００３】かかるスライムの付着を防止する方法とし
て、海水配管に塩素の注入、海水の電気分解により直接
塩素を作用させたり、次亜塩素酸ナトリウムの添加する
ことが行われている。又、今日、スライムの付着防止法
として、海水の取水配管に直接一定量のオゾンを注入す
る方法が簡単であり、消毒、水質浄化、アンモニア性窒
素の除去効果化も有り、多方面で採用されている。例え
ば、図２に示すごとく、海水１を取水ポンプ２でくみ上
げて所要の冷却設備へ送給水する海水配管３において、
取水ポンプ２の下流側から海水を一部分岐させて、エジ
ェクタ４の吸い込み効果でオゾンガスを吸入させて取水
ポンプ２の上流側に戻して、冷却水量に対して０．１〜
０．２ｐｐｍ程度のオゾン量を連続的に注入している。[0003] As a method for preventing the adhesion of the slime, injection of chlorine into seawater piping, direct action of chlorine by electrolysis of seawater, and addition of sodium hypochlorite have been performed. Also, as a method of preventing slime adhesion, it is easy to inject a certain amount of ozone directly into the seawater intake pipe, and there are also effects of disinfection, water purification, and removal of ammonia nitrogen. ing. For example, as shown in FIG. 2, in a seawater pipe 3 for pumping seawater 1 by a water pump 2 and supplying water to a required cooling facility,
A part of the seawater is branched from the downstream side of the water intake pump 2, the ozone gas is sucked in by the suction effect of the ejector 4, and returned to the upstream side of the water intake pump 2.
Ozone amount of about 0.2 ppm is continuously injected.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前述した海水
を冷却水とする設備は、一般的に冷却水流量が大きいた
め、水量に対して十分なオゾン量を連続して注入するの
は、大容量のオゾン設備が必要で費用面から難しい。一
方、海洋性微生物が成長して配管内部に付着するには、
１〜２日の成長時間があり、連続してオゾンを注入する
必要はない。間欠的に高い注入率で、オゾンを注入する
方が効果的である。また、間欠的に高い注入率でオゾン
を注入するため、連続的に発生するオゾンガスを低温で
一時貯蔵し、一気に放出する方法もあるが、この貯蔵設
備は高価であり、大量の海水を処理するには問題があ
る。However, since the above-mentioned equipment using seawater as cooling water generally has a large flow rate of cooling water, it is difficult to continuously inject a sufficient amount of ozone with respect to the amount of water. A large capacity ozone facility is required and it is difficult from a cost perspective. On the other hand, in order for marine microorganisms to grow and adhere inside the piping,
There is a 1-2 day growth time and there is no need to continuously inject ozone. It is more effective to inject ozone at an intermittently high injection rate. In order to inject ozone at an intermittently high injection rate, there is also a method of temporarily storing continuously generated ozone gas at a low temperature and discharging it at a stretch, but this storage equipment is expensive and treats a large amount of seawater. Has a problem.
【０００５】この発明は、大量の海水を必要とする船舶
冷却装置、火力発電所の冷却装置、ＬＮＧ気化装置等の
海水配管におけるスライムの付着を防止する方法の提供
を目的とし、また、簡単かつ安価な設備で十分な生物障
害防止及びスライムの付着防止効果を発揮する海水配管
のスライム付着防止法の提供を目的としている。An object of the present invention is to provide a method for preventing slime from adhering to seawater piping such as a ship cooling system, a cooling system for a thermal power plant, and an LNG vaporizer that requires a large amount of seawater. It is an object of the present invention to provide a method for preventing slime from adhering to seawater pipes, which exhibits sufficient biological obstacle prevention and slime adhesion prevention effects with inexpensive equipment.
【０００６】[0006]
【課題を解決するための手段】発明者は、簡単かつ安価
な設備で十分な生物障害防止及びスライムの付着防止効
果を発揮する海水配管のスライム付着防止法を目的に種
々検討した結果、天然海水中に約６０ｐｐｍ含まれる臭
素イオンを利用することに着目し、オキシダントはその
半減期が長く強い酸化、殺菌力をもっていることから、
天然海水にオゾンを吹き込み生成させたオキシダント含
有海水を海水配管に注入すると、すぐれた生物障害防止
及びスライムの付着防止効果を発揮することを知見しこ
の発明を完成した。SUMMARY OF THE INVENTION The present inventors have conducted various studies for the purpose of preventing slime from adhering to seawater pipes and exhibiting a sufficient effect of preventing biological damage and preventing slime from adhering to a simple and inexpensive facility. Focusing on utilizing bromine ions contained in about 60 ppm, oxidants have a long half-life and strong oxidizing and bactericidal properties,
The inventors have found that when oxidant-containing seawater generated by blowing ozone into natural seawater is injected into a seawater pipe, it exhibits excellent effects of preventing biological damage and preventing slime from adhering, and completed the present invention.
【０００７】すなわち、この発明は、天然海水にオゾン
を吹き込み生成させたオキシダントあるいはオキシダン
ト含有海水を海水配管に注入してスライムの付着を防止
する海水配管のスライム付着防止法において、天然海水
を溜めたオキシダント製造槽にオゾンを連続的に吹き込
み、オキシダント濃度上昇させながらオキシダント含有
海水を製造し、槽内のオキシダント濃度が所要濃度とな
った際にオキシダント含有海水を所定の注入率で海水配
管に注入することを特徴とする海水配管のスライム付着
防止法である。Namely, the present invention is a slime adhesion preventing method of the natural seawater blowing ozone into an oxidant or oxidant-containing seawater was generated by injecting seawater pipe you prevent <br/> slime adhesion of sea water piping , blowing ozone into an oxidant production bath reservoir of natural seawater continuously, oxidant-containing with increasing oxidant concentration
Manufactures seawater, and the oxidant concentration in the tank reaches the required concentration.
A method for preventing slime from adhering to seawater piping, characterized by injecting the oxidant-containing seawater into the seawater piping at a predetermined injection rate when the water is discharged.
【０００８】この発明において、オキシダント含有海水
のオキシダント濃度は自由に設定できるが、後述するご
とくその半減期が長く、強い酸化、殺菌力をもっている
ため、適用する海水配管の長さや単位時間当たりの処理
量排水時、設備内での滞留時間等に応じて設定し、特に
排水時に所定の低オキシダント濃度となるように設定さ
れることが望ましい。In the present invention, the oxidant concentration of the oxidant-containing seawater can be freely set, but since it has a long half-life and strong oxidizing and sterilizing power as described later, the length of the seawater pipe to be applied and the processing per unit time At the time of mass drainage, it is set according to the residence time in the equipment and the like, and it is particularly desirable to set so as to have a predetermined low oxidant concentration at the time of drainage.
【０００９】[0009]
【作用】この発明は、スライム付着防止のため、天然海
水に対して直接オゾンガスを注入するのではなく、天然
海水中に約６０ｐｐｍ含まれる臭素イオンを利用するも
のである。すなわち、天然海水にオゾンを吹き込むと次
の反応が起こる。 Ｂｒ-＋Ｏ3＝ＢｒＯ-＋Ｏ2 ＢｒＯ-＋２Ｏ3＝ＢｒＯ3 -＋２Ｏ2 発生した次亜臭素酸や臭素酸は強い酸化、殺菌力をもっ
ており、オキシダントとして海水中に残留する。また、
このオキシダントは、図３に示すように、その半減期は
長い。この発明では上記の特性を利用して、オキシダン
ト含有海水を間欠的にかつ所定の注入率で海水配管に注
入することにより、間欠的に高い注入率でオゾンを注入
するのと同等以上の効果を得ることが可能である。According to the present invention, natural seawater is used to prevent slime adhesion.
Instead of injecting ozone gas directly into water,
Utilizes bromine ions contained in seawater at about 60 ppm
It is. In other words, when ozone is blown into natural seawater,
Reaction occurs. Br-+ OThree= BrO-+ OTwo BrO-+ 2OThree= BrOThree -+ 2OTwo The generated hypobromite and bromic acid have strong oxidation and bactericidal properties.
And remains in seawater as an oxidant. Also,
This oxidant has a half-life of, as shown in FIG.
long. In the present invention, utilizing the above characteristics, oxidane
Inject seawater containing seawater into seawater piping intermittently and at a prescribed injection rate.
Injects ozone intermittently at a high injection rate
It is possible to obtain an effect equal to or more than that of
【００１０】[0010]
【実施例】この発明による海水配管のスライム付着防止
法を実施するための一実施例を図１に示す海水配管とオ
キシダント製造槽の例で説明する。海水１を取水ポンプ
２でくみ上げて所要の冷却設備へ送給水する海水配管３
において、取水ポンプ２の下流側から海水を一部分岐さ
せて、導入弁５を介して海水を溜めることができるオキ
シダント製造槽６へ流入させる。海水を溜めたオキシダ
ント製造槽６内に、図示しないオゾン発生装置からのオ
ゾンガスを注入して、オキシダントを生成させる。オキ
シダント製造槽６内のオキシダント濃度が上昇して所要
濃度に達したら導出弁７を開き、取水ポンプ２の上流側
の海水配管３に所要濃度のオキシダント含有海水を一気
に流入させる。海水配管３内をオキシダント含有海水が
通過する際にその強い酸化、殺菌力を発揮してスライム
の付着を防止する。なお、上記の構成ではオキシダント
製造槽６の容量を適宜選定することにより、間欠的に海
水配管３に注入する際の海水流量に対するオキシダント
濃度を設定することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment for implementing the method for preventing slime from adhering to seawater piping according to the present invention will be described with reference to an example of a seawater piping and an oxidant production tank shown in FIG. Seawater piping 3 that draws seawater 1 with a water pump 2 and feeds it to the required cooling equipment
In the above, the seawater is partially branched from the downstream side of the water intake pump 2 and flows into the oxidant production tank 6 through which the seawater can be stored through the introduction valve 5. An oxidant is generated by injecting ozone gas from an ozone generator (not shown) into the oxidant production tank 6 in which seawater is stored. When the oxidant concentration in the oxidant production tank 6 rises and reaches the required concentration, the outlet valve 7 is opened, and the oxidant-containing seawater having the required concentration flows into the seawater pipe 3 on the upstream side of the water intake pump 2 at once. When the oxidant-containing seawater passes through the seawater pipe 3, it exerts its strong oxidizing and sterilizing power to prevent slime from adhering. In the above configuration, by appropriately selecting the capacity of the oxidant production tank 6, the oxidant concentration with respect to the seawater flow rate when intermittently injected into the seawater pipe 3 can be set.
【００１１】[0011]
【発明の効果】この発明は、天然海水にオゾンを吹き込
み生成させたオキシダント含有海水を海水配管に注入し
てスライムの付着を防止するもので、例えば、従来の連
続してオゾンを注入するのと同じ容量の比較的小型のオ
ゾン発生設備を用いた場合でも、間欠的に高い注入率で
オゾンを注入するのと同等以上の効果を得ることができ
る。従って、この発明を実施するに際して、間欠的に高
い注入率でオゾンを注入するためにオゾンを低温で貯蔵
する設備などが不要であり、オゾン発生装置と海水を溜
める水槽があれば簡単に実施でき、またオキシダントが
強い酸化、殺菌力を有するため、安価に効率よくスライ
ムの付着を防止することができる。According to the present invention, the oxidant-containing seawater generated by blowing ozone into natural seawater is injected into seawater piping to prevent slime from adhering. Even when a relatively small-sized ozone generator having the same capacity is used, an effect equal to or more than that of injecting ozone at an intermittently high injection rate can be obtained. Therefore, when practicing the present invention, equipment for storing ozone at a low temperature for injecting ozone intermittently at a high injection rate is unnecessary, and can be easily implemented with an ozone generator and a water tank for storing seawater. In addition, since the oxidant has strong oxidizing and bactericidal properties, slime can be efficiently and inexpensively prevented from being attached.
【図１】この発明による海水配管のスライム付着防止法
を実施するための一実施例を示す海水配管とオキシダン
ト製造槽の概略説明図である。FIG. 1 is a schematic explanatory view of a seawater pipe and an oxidant production tank showing an embodiment for carrying out a method of preventing slime adhesion on a seawater pipe according to the present invention.
【図２】従来の海水配管へのオゾンガス注入法の一例を
示す海水配管の概略説明図である。FIG. 2 is a schematic explanatory view of a seawater pipe showing an example of a conventional method of injecting ozone gas into a seawater pipe.
【図３】オキシダントの半減期を示す時間とオキシダン
ト濃度との関係図である。FIG. 3 is a graph showing the relationship between time indicating the half-life of oxidant and oxidant concentration.
１ 海水 ２ 取水ポンプ ３ 海水配管 ４ エジェクタ ５ 導入弁 ６ オキシダント製造槽 ７ 導出弁 Reference Signs List 1 seawater 2 intake pump 3 seawater pipe 4 ejector 5 introduction valve 6 oxidant production tank 7 outlet valve
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０２Ｆ 1/50 ５４０ Ｃ０２Ｆ 1/50 ５４０Ｂ ５５０ ５５０Ｄ ５５０Ｌ 1/76 1/76 Ａ 1/78 1/78 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI C02F 1/50 540 C02F 1/50 540B 550 550D 550L 1/76 1/76 1/76 A 1/78 1/78
Claims (1)
オキシダントあるいはオキシダント含有海水を海水配管
に注入してスライムの付着を防止する海水配管のスライ
ム付着防止法において、天然海水を溜めたオキシダント
製造槽にオゾンを連続的に吹き込み、オキシダント濃度
上昇させながらオキシダント含有海水を製造し、槽内の
オキシダント濃度が所要濃度となった際にオキシダント
含有海水を所定の注入率で海水配管に注入することを特
徴とする海水配管のスライム付着防止法。An oxidant produced by blowing ozone into natural seawater or an oxidant-containing seawater is injected into seawater piping to prevent slime from adhering to the seawater piping.
Oxidant containing natural seawater in the anti-fouling law
Ozone is continuously blown into the production tank, and the oxidant concentration
While producing seawater containing oxidant,
When the oxidant concentration reaches the required concentration,
A method for preventing slime from adhering to seawater pipes, comprising injecting the contained seawater into the seawater pipes at a predetermined injection rate .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5098949A JP2787185B2 (en) | 1993-03-31 | 1993-03-31 | Slime adhesion prevention method for seawater piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5098949A JP2787185B2 (en) | 1993-03-31 | 1993-03-31 | Slime adhesion prevention method for seawater piping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06287004A JPH06287004A (en) | 1994-10-11 |
| JP2787185B2 true JP2787185B2 (en) | 1998-08-13 |
Family
ID=14233358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5098949A Expired - Fee Related JP2787185B2 (en) | 1993-03-31 | 1993-03-31 | Slime adhesion prevention method for seawater piping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2787185B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005144212A (en) * | 2003-11-11 | 2005-06-09 | Chugoku Electric Power Co Inc:The | Method and system for controlling adhesion and growth of marine organism |
| JP7264561B1 (en) * | 2022-11-09 | 2023-04-25 | 株式会社Okamura | Antifouling device and antifouling method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03186694A (en) * | 1989-12-14 | 1991-08-14 | Taiho Ind Co Ltd | Sticking preventing method for oceanic life |
| JPH04156994A (en) * | 1990-10-16 | 1992-05-29 | Mitsubishi Heavy Ind Ltd | Method for injecting batericidal and algaecidal agent to cooling water |
-
1993
- 1993-03-31 JP JP5098949A patent/JP2787185B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06287004A (en) | 1994-10-11 |
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