JP5796479B2 - Cooling water treatment method - Google Patents

Cooling water treatment method Download PDF

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JP5796479B2
JP5796479B2 JP2011273588A JP2011273588A JP5796479B2 JP 5796479 B2 JP5796479 B2 JP 5796479B2 JP 2011273588 A JP2011273588 A JP 2011273588A JP 2011273588 A JP2011273588 A JP 2011273588A JP 5796479 B2 JP5796479 B2 JP 5796479B2
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cooling water
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chlorine
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storage tank
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智之 沖田
智之 沖田
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JFE Steel Corp
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Description

この発明は、循環使用する冷却水を結合塩素剤で処理する方法に関する。   The present invention relates to a method of treating circulating coolant with a combined chlorine agent.

従来より、工場等で使用する冷却水は、用水の使用量削減を目的として循環利用することが行われている。その場合、循環水が高濃縮化されて腐食したり、スケールやスライムが含まれた状態となることを防止するために、使用済冷却水を水処理剤で処理する必要がある。水処理剤の一つであるスライムコントロール剤としては、近年、次亜塩素酸ナトリウム等の塩素系薬品に代えて結合塩素剤を用いることが多くなっている。
結合塩素剤は、遊離塩素と塩素安定化剤（刺激抑制成分）が結合されたものである。結合塩素剤による冷却水のスライム処理は、結合塩素剤の塩素分がスライムと結合することで行われるため、スライム処理によって前記結合塩素剤の塩素分が消費されて塩素安定化剤が使用済冷却水中に残留する。 Conventionally, cooling water used in factories or the like has been circulated for the purpose of reducing the amount of water used. In that case, it is necessary to treat the used cooling water with a water treatment agent in order to prevent the circulating water from being highly concentrated and corroded or becoming in a state containing scales and slime. In recent years, as a slime control agent, which is one of water treatment agents, a bonded chlorine agent is often used instead of a chlorine-based chemical such as sodium hypochlorite.
The combined chlorine agent is a combination of free chlorine and a chlorine stabilizer (stimulus suppression component). The slime treatment of the cooling water with the combined chlorine agent is performed by combining the chlorine content of the combined chlorine agent with the slime, so the chlorine content of the combined chlorine agent is consumed by the slime treatment and the chlorine stabilizer is used. Remains in water.

特許文献１には、結合塩素剤を用いた水系処理剤の濃度制御方法として、遊離塩素を水系に発生させて、該水系の結合塩素の量を制御する方法が記載されている。また、水系内の遊離塩素と水系内に残留している塩素安定化剤と結合させて結合塩素にすることが記載されている。また、遊離塩素を発生させるために、次亜塩素酸ナトリウムなどを水系へ供給することが記載されている。さらに、循環水系を長期運転させると塩素安定化剤が水系に多量に残留するため、この方法は循環水系に好適であると記載されている。
このように、特許文献１に記載された方法では、水系に結合塩素剤と塩素成分（遊離塩素発生成分）を供給しているが、塩素安定化剤は供給していない。結合塩素剤は高価である。 Patent Document 1 describes a method for controlling the amount of aqueous combined chlorine by generating free chlorine in the aqueous system as a method for controlling the concentration of the aqueous processing agent using the combined chlorine agent. Moreover, it describes combining with free chlorine in the aqueous system and a chlorine stabilizer remaining in the aqueous system to form combined chlorine. Further, it describes that sodium hypochlorite and the like are supplied to an aqueous system in order to generate free chlorine. Furthermore, since a large amount of chlorine stabilizer remains in the water system when the circulating water system is operated for a long time, this method is described as being suitable for the circulating water system.
As described above, in the method described in Patent Document 1, the combined chlorine agent and the chlorine component (free chlorine generating component) are supplied to the aqueous system, but the chlorine stabilizer is not supplied. Combined chlorinating agents are expensive.

特開２００９−１９５８２３号公報JP 2009-195823 A

この発明の課題は、循環使用する冷却水を結合塩素剤で処理する方法の処理コストを低減することである。   The subject of this invention is reducing the processing cost of the method of processing the cooling water used in circulation with a combined chlorine agent.

上記課題を解決するために、この発明の冷却水の処理方法は、下記の構成(1) 〜(4) を有することを特徴とする。
(1) 循環使用する冷却水を、結合塩素剤を添加せずに結合塩素剤で処理する。
(2) 冷却水使用設備に供給する冷却水を貯留する冷却水貯留槽と、前記冷却水貯留槽と前記設備の冷却水導入口とを接続する給水管と、前記冷却水貯留槽と前記設備の冷却水排出口とを接続する戻し管と、水系で結合されて結合塩素剤となる塩素剤および塩素安定化剤を別々に前記冷却水貯留槽に供給する薬剤供給装置と、前記給水管内の冷却水に含まれている前記結合塩素剤の濃度を検出する入側濃度検出器と、前記戻し管内の使用済冷却水に含まれている前記結合塩素剤の濃度を検出する出側濃度検出器と、を用いる。
(3) 前記入側濃度検出器で検出された入側結合塩素剤濃度が基準値未満の場合は、前記薬剤供給装置から前記冷却水貯留槽に前記塩素剤と塩素安定化剤の両方を供給する。
(4) 前記入側濃度検出器で検出された入側結合塩素剤濃度が基準値以上の場合は、前記入側結合塩素剤濃度と前記出側濃度検出器で検出された出側結合塩素剤濃度との差に応じて、前記薬剤供給装置から前記冷却水貯留槽に前記塩素剤のみを供給する。 In order to solve the above-mentioned problems, the cooling water treatment method of the present invention is characterized by having the following configurations (1) to (4).
(1) Treat the cooling water to be circulated with the combined chlorine agent without adding the combined chlorine agent.
(2) A cooling water storage tank for storing cooling water to be supplied to the cooling water use facility, a water supply pipe connecting the cooling water storage tank and the cooling water inlet of the facility, the cooling water storage tank and the facility A return pipe that connects the cooling water discharge port, a chemical supply device that separately supplies a chlorine agent and a chlorine stabilizer that are combined in an aqueous system and become a combined chlorine agent to the cooling water storage tank, and An inlet side concentration detector for detecting the concentration of the combined chlorine agent contained in the cooling water, and an outlet side concentration detector for detecting the concentration of the combined chlorine agent contained in the used cooling water in the return pipe And are used.
(3) When the concentration of the inlet side bound chlorine agent detected by the inlet side concentration detector is less than a reference value, supply both the chlorine agent and the chlorine stabilizer from the drug supply device to the cooling water storage tank. To do.
(4) In the case where the concentration of the inlet-side chlorinated agent detected by the inlet-side concentration detector is equal to or higher than a reference value, the concentration of the inlet-side chlorinated agent and the outlet-side chlorinated agent detected by the outlet-side concentration detector Only the chlorine agent is supplied from the medicine supply device to the cooling water storage tank according to the difference with the concentration.

この発明の方法では、前記冷却水貯留槽に前記薬剤供給装置から塩素剤および塩素安定化剤が別々に供給される。また、前記冷却水貯留槽からの冷却水が、給水管から冷却水使用設備に供給され、前記冷却水使用設備からの使用済冷却水が、戻し管から冷却水貯留槽に導入される。また、冷却水使用設備の入側と出側で結合塩素剤の濃度が検出される。
そして、この方法では、前記入側濃度検出器で検出された入側結合塩素剤濃度が基準値以上となるまで、前記薬剤供給装置から前記冷却水貯留槽に前記塩素剤と塩素安定化剤の両方が供給される。これにより、前記冷却水貯留槽内で塩素剤および塩素安定化剤が結合されて結合塩素剤となり、この結合塩素剤が含まれた冷却水が前記冷却水貯留槽から前記設備の冷却水導入口に供給される。 In the method of the present invention, the chlorine agent and the chlorine stabilizer are separately supplied from the chemical supply device to the cooling water storage tank. Moreover, the cooling water from the said cooling water storage tank is supplied to a cooling water use installation from a water supply pipe, and the used cooling water from the said cooling water use installation is introduce | transduced into a cooling water storage tank from a return pipe. Moreover, the concentration of the combined chlorinating agent is detected on the entry side and the exit side of the cooling water use facility.
In this method, the chlorine supply agent and the chlorine stabilizer are supplied from the chemical supply device to the cooling water storage tank until the concentration of the input side combined chlorine agent detected by the input side concentration detector becomes equal to or higher than a reference value. Both are supplied. Thus, the chlorine agent and the chlorine stabilizer are combined in the cooling water storage tank to become a combined chlorine agent, and the cooling water containing the combined chlorine agent is supplied from the cooling water storage tank to the cooling water inlet of the facility. To be supplied.

また、前記入側濃度検出器で検出された入側結合塩素剤濃度が基準値以上になった場合は、前記入側結合塩素剤濃度と前記出側濃度検出器で検出された出側結合塩素剤濃度との差に応じて、前記薬剤供給装置から前記冷却水貯留槽に前記塩素剤のみが供給される。この塩素剤により、スライム処理によって消費された塩素分が前記冷却水貯留槽に補給される。そして、この塩素剤と、前記冷却水貯留槽に導入された使用済冷却水に含まれていた塩素安定化剤が結合されて、結合塩素剤となる。
したがって、この発明の方法によれば、高額な結合塩素剤を購入することなく、安価な塩素剤および塩素安定化剤を供給することで、結合塩素剤によるスライム処理を行うことができる。 In addition, when the concentration of the inlet-side chlorinated agent detected by the inlet-side concentration detector exceeds a reference value, the concentration of the inlet-side chlorinated agent and the outlet-side bound chlorine detected by the outlet-side concentration detector Only the chlorine agent is supplied from the medicine supply device to the cooling water storage tank according to the difference with the agent concentration. With this chlorine agent, the chlorine content consumed by the slime treatment is supplied to the cooling water storage tank. And this chlorine agent and the chlorine stabilizer contained in the used cooling water introduced into the said cooling water storage tank are combined, and it becomes a combined chlorine agent.
Therefore, according to the method of the present invention, it is possible to perform slime treatment with a combined chlorine agent by supplying an inexpensive chlorine agent and a chlorine stabilizer without purchasing an expensive combined chlorine agent.

この発明の方法によれば、循環使用する冷却水を結合塩素剤で処理する方法の処理コストを低減できる。   According to the method of this invention, the processing cost of the method of processing the cooling water to be circulated with the combined chlorine agent can be reduced.

実施形態の方法が実施可能な水処理設備を示す概略構成図である。It is a schematic block diagram which shows the water treatment facility which can implement the method of embodiment. 図１の水処理設備を構成する制御装置が実施する演算処理を示すフローチャートである。It is a flowchart which shows the arithmetic processing which the control apparatus which comprises the water treatment installation of FIG. 1 implements.

以下、この発明の実施形態について説明する。
この実施形態の方法は、工場で使用する冷却水を結合塩素剤で処理して循環使用する方法であって、図１に示す水処理設備を使用して実施することができる。
この水処理設備は、工場（冷却水使用設備）１に供給する冷却水を貯留する冷却水貯留槽２を有する。冷却水貯留槽２には、冷却塔２０で冷却された水が貯留される。冷却水貯留槽２はブロー用の排水管２１を有する。排水管２１はバルブ２２を有する。バルブ２２は電動開閉装置２３で開閉される。バルブ２２は通常は閉じてあるが、濃縮防止のために定期的に所定時間、開状態とする。 Embodiments of the present invention will be described below.
The method of this embodiment is a method in which cooling water used in a factory is treated with a combined chlorine agent and circulated, and can be implemented using the water treatment facility shown in FIG.
This water treatment facility has a cooling water storage tank 2 for storing cooling water supplied to a factory (cooling water use facility) 1. The cooling water storage tank 2 stores water cooled by the cooling tower 20. The cooling water storage tank 2 has a drainage pipe 21 for blow. The drain pipe 21 has a valve 22. The valve 22 is opened and closed by an electric opening / closing device 23. The valve 22 is normally closed, but is kept open for a predetermined time periodically to prevent concentration.

冷却水貯留槽２と工場１の冷却水導入口が給水管３で接続されている。冷却水貯留槽２と工場１の冷却水排出口が戻し管４で接続されている。給水管３はポンプ３０を有する。給水管３および戻し管４は濃度検出器３１ａ，４１ａを経由する迂回管３１，４１を有する。濃度検出器３１ａ，４１ａは、迂回管３１，４１内の冷却水に含まれている有機系クロラミン（結合塩素剤）の濃度Ｃ3 ，Ｃ4 を検出する。 The cooling water storage tank 2 and the cooling water inlet of the factory 1 are connected by a water supply pipe 3. The cooling water storage tank 2 and the cooling water discharge port of the factory 1 are connected by a return pipe 4. The water supply pipe 3 has a pump 30. The water supply pipe 3 and the return pipe 4 have detour pipes 31 and 41 that pass through the concentration detectors 31a and 41a. The concentration detectors 31 a and 41 a detect the concentrations C 3 and C 4 of organic chloramine (bound chlorine agent) contained in the cooling water in the bypass pipes 31 and 41.

この水処理設備は、また、薬液タンク５，６と、配管５１，６１と、ポンプ５２，６２と、バルブ５３，６３と、電動開閉装置５４，６４からなる薬剤供給装置を有する。薬液タンク５には次亜塩素酸ナトリウム（塩素剤）の水溶液が入っている。薬液タンク６にはベンゼンスルホンアミド誘導体（塩素安定化剤）を含有する液体が入っている。
薬液タンク５，６と冷却水貯留槽２は、それぞれ配管５１，６１で接続されている。配管５１，６１は、それぞれポンプ５２，６２とバルブ５３，６３を有する。バルブ５３，６３は、それぞれ電動開閉装置５４，６４で開閉される。 This water treatment facility also includes a chemical supply device including chemical tanks 5 and 6, pipes 51 and 61, pumps 52 and 62, valves 53 and 63, and electric switchgears 54 and 64. The chemical solution tank 5 contains an aqueous solution of sodium hypochlorite (chlorine agent). The chemical tank 6 contains a liquid containing a benzenesulfonamide derivative (chlorine stabilizer).
The chemical tanks 5 and 6 and the cooling water storage tank 2 are connected by pipes 51 and 61, respectively. The pipes 51 and 61 have pumps 52 and 62 and valves 53 and 63, respectively. The valves 53 and 63 are opened and closed by electric opening and closing devices 54 and 64, respectively.

この水処理設備は、さらに、制御装置７を有する。制御装置７は、濃度検出器３１ａ，４１ａからの濃度検出信号Ｓ3 ，Ｓ4 を入力して、図２に示すフローチャートに従う演算処理を所定間隔で常時行って、電動開閉装置５４，６４に開閉信号Ｓ5 ，Ｓ6 を出力する。なお、バルブ２２の電動開閉装置２３の制御は、制御装置７とは別の制御装置で行っている。 This water treatment facility further includes a control device 7. The control device 7 receives the concentration detection signals S 3 and S 4 from the concentration detectors 31a and 41a, and constantly performs arithmetic processing according to the flowchart shown in FIG. 2 at predetermined intervals to open and close the electric opening and closing devices 54 and 64. Signals S 5 and S 6 are output. The electric opening / closing device 23 of the valve 22 is controlled by a control device different from the control device 7.

図２のフローチャートについて説明する。
先ず、ステップＳ１では、濃度検出信号Ｓ3 が示す有機系クロラミンの濃度（入側結合塩素剤濃度）Ｃ3 と、濃度検出信号Ｓ4 が示す有機系クロラミンの濃度（出側結合塩素剤濃度）Ｃ4 を読み込んでステップＳ２に移行する。ステップＳ２では、入側濃度Ｃ3 が基準値ＣS 以上であるか否かを判断して、基準値以上であればステップＳ３に、基準値未満であればステップＳ４に移行する。 The flowchart of FIG. 2 will be described.
First, in step S1, the organic chloramines indicated density detection signal S 3 concentration (entry side combined chlorine concentration) C 3, the concentration of organic chloramines indicated concentration detection signal S 4 (exit side combined chlorine concentration) the process proceeds to step S2 reads the C 4. In step S2, the inlet side concentration C 3 is then determined whether the reference value C S above, step S3 equal to or more than the reference value, the process proceeds to step S4 if it is less than the reference value.

ステップＳ３では、入側濃度Ｃ3 と出側濃度Ｃ4 との差（ΔＣ＝Ｃ3 −Ｃ4 ）を算出してステップＳ５に移行する。ステップＳ５では、開閉信号Ｓ5 をΔＣに応じた開度に開く信号に設定し、開閉信号Ｓ6 を閉じる信号に設定して、ステップＳ６に移行する。
ステップＳ４では、開閉信号Ｓ5 ，Ｓ6 をともに所定開度で開く信号に設定して、ステップＳ６に移行する。
ステップＳ６では、ステップＳ５またはステップＳ４で設定された開閉信号Ｓ5 ，Ｓ6 を電動開閉装置５４，６４に出力して、この演算処理を終了する。 In step S3, the process proceeds to step S5 to calculate the difference between the inlet side concentration C 3 and the exit-side concentration C 4 (ΔC = C 3 -C 4). In step S5, sets the signal for opening the switching signal S 5 to the opening degree corresponding to the [Delta] C, by setting the switching signal S 6 closing signal, the process proceeds to step S6.
In step S4, sets the switching signal S 5, S 6 are both signal for opening to a predetermined degree, the process proceeds to step S6.
In step S6, the opening / closing signals S 5 and S 6 set in step S5 or step S4 are output to the electric opening / closing devices 54 and 64, and this calculation process is terminated.

図１の処理設備は以下のように作動する。
この設備の使用開始当初は、給水管３内の有機系クロラミンの濃度Ｃ3 が基準値ＣS 未満であるため、図２の演算処理でステップＳ２からステップＳ４に移行して、ステップＳ４で開閉信号Ｓ5 ，Ｓ6 がともに所定開度で開く信号に設定されて、ステップＳ６で電動開閉装置５４，６４に出力される。これに伴って、電動開閉装置５４，６４が作動してバルブ５３，６３が所定開度で開状態となり、薬液タンク５，６から冷却水貯留槽２に配管５１，６１を介して、次亜塩素酸ナトリウムの水溶液とベンゼンスルホンアミド誘導体を含有する液体が供給される。
これにより、冷却水貯留槽２内で次亜塩素酸とベンゼンスルホンアミド誘導体が結合されて有機系クロラミンとなる。この有機系クロラミンが含まれた冷却水が、冷却水貯留槽２から工場１の冷却水導入口に供給される。 The processing facility of FIG. 1 operates as follows.
Beginning of use this facility, since the concentration C 3 organic chloramines in the water supply pipe 3 is less than the reference value C S, the process proceeds from step S2 to step S4 by the arithmetic processing of Fig. 2, open and close in step S4 Signals S 5 and S 6 are both set to open at a predetermined opening, and are output to electric switchgears 54 and 64 in step S6. Along with this, the electric opening / closing devices 54 and 64 are operated to open the valves 53 and 63 at a predetermined opening degree, and the hypothetical tanks 5 and 6 are connected to the cooling water storage tank 2 via the pipes 51 and 61. A liquid containing an aqueous solution of sodium chlorate and a benzenesulfonamide derivative is supplied.
Thereby, hypochlorous acid and a benzenesulfonamide derivative are combined in the cooling water storage tank 2 to form an organic chloramine. The cooling water containing the organic chloramine is supplied from the cooling water storage tank 2 to the cooling water inlet of the factory 1.

次に、給水管３内の有機系クロラミンの濃度Ｃ3 が基準値ＣS 以上となると、図２の演算処理でステップＳ２からステップＳ３に移行して、入側濃度Ｃ3 と出側濃度Ｃ4 との差（ΔＣ＝Ｃ3 −Ｃ4 ）が算出される。次に、ステップＳ５で、開閉信号Ｓ5 がΔＣに応じた開度に開く信号に設定され、開閉信号Ｓ6 が閉じる信号に設定されて、これらの信号Ｓ5 ，Ｓ6 がステップＳ６で電動開閉装置５４，６４に出力される。 Then, when the concentration C 3 organic chloramines in the water supply pipe 3 becomes higher than the reference value C S, the process proceeds from step S2 to step S3 in processing of FIG. 2, the inlet side concentration C 3 and the exit-side concentration C The difference from 4 (ΔC = C 3 −C 4 ) is calculated. Next, in step S5, the switching signal S 5 is set to signal for opening the opening corresponding to the [Delta] C, is set to open the signal S 6 is closed signals, electric these signals S 5, S 6 are in step S6 It is output to the opening / closing devices 54 and 64.

これに伴って、電動開閉装置５４，６４が作動して、バルブ５３がΔＣに応じた開度で開状態となり、バルブ６３が閉じた状態となる。その結果、薬液タンク５から冷却水貯留槽２に配管５１を介して、次亜塩素酸ナトリウムの水溶液が供給されるが、薬液タンク６からの供給は停止される。これにより、スライム処理によって消費された塩素分が冷却水貯留槽２に補給される。そして、この次亜塩素酸ナトリウムと、戻し管４の使用済冷却水に含まれていたベンゼンスルホンアミド誘導体が冷却水貯留槽２内で反応して、有機系クロラミンとなる。   Along with this, the electric opening / closing devices 54 and 64 are operated, and the valve 53 is opened at an opening degree corresponding to ΔC, and the valve 63 is closed. As a result, the aqueous solution of sodium hypochlorite is supplied from the chemical tank 5 to the cooling water storage tank 2 via the pipe 51, but the supply from the chemical tank 6 is stopped. Thereby, the chlorine component consumed by the slime treatment is supplied to the cooling water storage tank 2. And this sodium hypochlorite and the benzenesulfonamide derivative contained in the used cooling water of the return pipe 4 react in the cooling water storage tank 2, and become organic chloramine.

したがって、この実施形態の方法によれば、高額な有機系クロラミン（結合塩素剤）を購入することなく、安価な次亜塩素酸ナトリウム（塩素剤）およびベンゼンスルホンアミド誘導体（塩素安定化剤）を冷却水貯留槽２内に供給することにより、工場１の冷却水に対する有機系クロラミン（結合塩素剤）によるスライム処理を行うことができるため、処理コストを低減できる。   Therefore, according to the method of this embodiment, inexpensive sodium hypochlorite (chlorine agent) and benzenesulfonamide derivative (chlorine stabilizer) can be obtained without purchasing expensive organic chloramine (bound chlorine agent). Since the slime process by the organic chloramine (bonded chlorine agent) with respect to the cooling water of the factory 1 can be performed by supplying in the cooling water storage tank 2, processing cost can be reduced.

上記実施形態の方法では、塩素剤として次亜塩素酸ナトリウムを使用し、塩素安定化剤として、次亜塩素酸ナトリウムと水系で結合されて有機系クロラミン（例えば、クロラミンＴ、クロラミンＢ）となるベンゼンスルホンアミド誘導体を使用しているが、この発明の方法で使用可能な塩素剤および塩素安定化剤の組み合わせは、水系で結合されて結合塩素剤となる塩素剤および塩素安定化剤の組み合わせであれば、他の組み合わせであってもよい。   In the method of the above embodiment, sodium hypochlorite is used as a chlorinating agent, and as a chlorine stabilizer, it is combined with sodium hypochlorite in an aqueous system to form an organic chloramine (for example, chloramine T, chloramine B). Although the benzenesulfonamide derivative is used, the combination of a chlorine agent and a chlorine stabilizer that can be used in the method of the present invention is a combination of a chlorine agent and a chlorine stabilizer that are combined in an aqueous system to become a combined chlorine agent. Any other combination may be used.

１ 工場（冷却水使用設備）
２ 冷却水貯留槽
２０ 冷却塔
２１ ブロー用の排水管
２２ バルブ
２３ 電動開閉装置
３ 給水管
３０ ポンプ
３１ 迂回管
３１ａ 濃度検出器（入側濃度検出器）
４ 戻し管
４１ 迂回管
４１ａ 濃度検出器（出側濃度検出器）
５ 薬液タンク
５１ 配管
５２ ポンプ
５３ バルブ
５４ 電動開閉装置
６ 薬液タンク
６１ 配管
６２ ポンプ
６３ バルブ
６４ 電動開閉装置
７ 制御装置 1 factory (equipment using cooling water)
2 Cooling water storage tank 20 Cooling tower 21 Blowing drain pipe 22 Valve 23 Electric switchgear 3 Water supply pipe 30 Pump 31 Detour pipe 31a Concentration detector (incoming concentration detector)
4 Return pipe 41 Detour pipe 41a Concentration detector (outside concentration detector)
5 Chemical liquid tank 51 Piping 52 Pump 53 Valve 54 Electric switchgear 6 Chemical liquid tank 61 Piping 62 Pump 63 Valve 64 Electric switchgear 7 Control device

Claims (1)

循環使用する冷却水を、結合塩素剤を添加せずに結合塩素剤で処理する冷却水の処理方法であって、
冷却水使用設備に供給する冷却水を貯留する冷却水貯留槽と、
前記冷却水貯留槽と前記設備の冷却水導入口とを接続する給水管と、
前記冷却水貯留槽と前記設備の冷却水排出口とを接続する戻し管と、
水系で結合されて結合塩素剤となる塩素剤および塩素安定化剤を別々に前記冷却水貯留槽に供給する薬剤供給装置と、
前記給水管内の冷却水に含まれている前記結合塩素剤の濃度を検出する入側濃度検出器と、
前記戻し管内の使用済冷却水に含まれている前記結合塩素剤の濃度を検出する出側濃度検出器と、
を用い、
前記入側濃度検出器で検出された入側結合塩素剤濃度が基準値未満の場合は、前記薬剤供給装置から前記冷却水貯留槽に前記塩素剤と塩素安定化剤の両方を供給し、
前記入側濃度検出器で検出された入側結合塩素剤濃度が基準値以上の場合は、前記入側結合塩素剤濃度と前記出側濃度検出器で検出された出側結合塩素剤濃度との差に応じて、前記薬剤供給装置から前記冷却水貯留槽に前記塩素剤のみを供給することを特徴とする冷却水の処理方法。 A cooling water treatment method for treating circulating cooling water with a combined chlorine agent without adding a combined chlorine agent,
A cooling water storage tank for storing cooling water to be supplied to the cooling water use facility;
A water supply pipe connecting the cooling water storage tank and the cooling water inlet of the facility;
A return pipe connecting the cooling water storage tank and the cooling water discharge port of the facility;
A chemical supply device that separately supplies a chlorine agent and a chlorine stabilizer, which are combined in an aqueous system and become a combined chlorine agent, to the cooling water storage tank;
An entry-side concentration detector for detecting the concentration of the combined chlorine agent contained in the cooling water in the water supply pipe;
An outlet concentration detector for detecting the concentration of the combined chlorine agent contained in the used cooling water in the return pipe;
Use
When the inlet-side combined chlorine agent concentration detected by the inlet-side concentration detector is less than a reference value, supply both the chlorine agent and the chlorine stabilizer from the drug supply device to the cooling water storage tank,
In the case where the inlet-side bound chlorinating agent concentration detected by the inlet-side concentration detector is greater than or equal to a reference value, the inlet-side bound chlorinating agent concentration and the outlet-side bound chlorinating agent concentration detected by the outlet-side concentration detector are According to a difference, only the said chlorine agent is supplied to the said cooling water storage tank from the said chemical | medical agent supply apparatus, The processing method of the cooling water characterized by the above-mentioned.
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