JP4078192B2

JP4078192B2 - Water supply / drainage method, water supply / drainage system and cleaning device in sludge removal work

Info

Publication number: JP4078192B2
Application number: JP2002340792A
Authority: JP
Inventors: 精彦堀内; 雄鷲尾; 吉弘横田
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2002-11-25
Filing date: 2002-11-25
Publication date: 2008-04-23
Anticipated expiration: 2022-11-25
Also published as: JP2004176946A

Description

【０００１】
【発明の属する技術分野】
本発明は、熱交換器におけるスラッジ除去工事における給排水方法及び給排水システム、ヒドラジン検出装置、洗浄装置に関するものである。
【０００２】
【従来の技術】
原子力発電設備においては、定められた運転経過に伴い定期点検（以下、定検という）が実施されるが、この定検中に、運転に伴い蒸気発生器二次側管板上に堆積した金属スラッジ成分を除去・排出する工事を蒸気発生器スラッジランシング工事と呼び、この工事を行う設備は、給水設備、洗浄設備、排水処理設備の３つに区分されている。
【０００３】
図４は、従来実施されている原子力発電設備蒸気発生器のスラッジランシング工事の概念図を示す。Ａは蒸気発生器（以下、「ＳＧ」とも称する）、Ｂは原子力発電設備の外郭（屋内は放射線管理区域）、Ｃは伝熱管、Ｄは管板（蒸気発生器Ａ内に設けられて伝熱管Ｃを貫通し、管板Ｄより上部側が二次側と呼ばれる。）である。
【０００４】
給水設備５１は、給水タンク５２、ヒドラジンポンプ５３、ヒドラジンタンク５４、給水ポンプ５５で構成され、純水５６にヒドラジンが調整され、洗浄水５７として給水ポンプ５５を介し、高圧ジェットポンプ５９へ給水する設備である。
【０００５】
洗浄設備５８は、屋外に配設された高圧ジェットポンプ５９、蒸気発生器Ａ内の管板Ｄ上の二次側に挿入された洗浄装置（ロボット）６０、蒸気発生器Ａ外に配設された２基の排水ポンプ６１等で構成され、前記ロボット６０を管板Ｄ上において移動させ、前記高圧ジェットポンプ５９の高圧水６２を用いて、管板Ｄ上の二次側に堆積する金属スラッジ成分を洗い流すとともに、その洗浄排水６３、６４を前記排水ポンプ６１により屋外へ排水する設備である。
【０００６】
排水処理設備６５は、前記洗浄設備５８からの洗浄排水６３、６４を受けて、バグフィルタ６６、排水受けタンク６７、排水処理ポンプ６８、排水カートリッジフィルタ６９、再循環カートリッジフィルタ７０、カチオン樹脂塔７２、放流タンク７５、放流ポンプ７７等により構成された設備により、洗浄排水６３、６４をフィルタによる濾過や樹脂塔により清浄化して、放流水７６とし、放流タンク７５に貯留後放流する設備である。なお、再循環カートリッジフィルタ７０で処理されたスラッジ除去水７１を再循環水７３として、前記管板Ｄ上の洗浄用水に使用することがある。
【０００７】
図５は、従来の蒸気発生器スラッジランシング工事における給水設備５１の系統図、図６は、蒸気発生器スラッジランシング工事における排水処理設備６５の系統図である。
【０００８】
図４及び図５、図６に基づき、従来行われていた蒸気発生器スラッジランシング工事の作業状況について説明する。給水設備５１において、給水タンク５２に貯留されている純水５６に、ヒドラジンタンク５４からヒドラジンポンプ５３を介して、ヒドラジンを調整しながら混入させ、洗浄水５７とする。ここで、作業者が給水タンク５２から洗浄水５７をサンプル採取してヒドラジン濃度分析☆１を行い（一つのＳＧを給水するにあたって約５０回行う）、洗浄期間中において、洗浄水５７が所定のヒドラジン濃度に調整されていることを確認して、給水ポンプ５５を介し、高圧ジェットポンプ５９に給水する。
【０００９】
排水処理設備６５において、前述の洗浄設備５８から排水された排水６３、６４を洗浄期間中作業者がサンプル採取し、スラッジ濃度分析☆２、☆３（一つのＳＧにつき８０回）を行い、ミリポア濾過紙により濾過し、濾過前後の乾燥重量を測定したものを平均し、積算流量を乗じて回収スラッジ量を評価する。
【００１０】
また、排水受けタンク６７底部の排水処理ポンプ６８の吸込み口にエアを混入しないよう水位を保ちつつ、また、水位がオーバーフローしないよう作業者は水位計７９を常時監視しながら手動弁調整作業☆４（随時）を行い、カチオン樹脂塔７２を介してスラッジ除去水７１を清浄水７４として放流タンク７５へ移送する。
【００１１】
また、前述の洗浄設備５８において、管板Ｄ上のスラッジの排出性を確保するためと、管板Ｄ上外周部の排水ノズル方向の流れを作るため、排水カートリッジフィルタ６９及び再循環水カートリッジフィルタ７０で処理したスラッジ除去水７１を、再循環流量計７８を常時監視しながら作業者が手動弁調整作業☆５（随時）により再循環水７３として供給する。
【００１２】
また、カチオン樹脂塔７２において処理された清浄水７４を作業者がサンプル採取し、ヒドラジン濃度分析☆６（５０回／ＳＧ）後、放流タンク７５に貯留し、放流水７６として放流ポンプ７７を介し放流している。
【００１３】
【特許文献１】
特開昭５７−１２２９９４号公報
【００１４】
【発明が解決しようとする課題】
しかしながら、上述した従来の蒸気発生器スラッジランシング工事では、ヒドラジン濃度管理、スラッジ評価量管理、排水受けタンク水位調整、再循環流量調整作業等、作業者の手作業により進められている作業量が多く且つその作業頻度も高いことから、作業者の労務コストが増加することが問題となっている。
【００１５】
本発明は、上記の問題点を解決するためになされたもので、作業者の労務コストを低減することできる、熱交換器のスラッジ除去工事における能率的な給排水方法及び給排水システム、ヒドラジン検出装置、洗浄装置を提供することを目的とする。
【００１６】
【課題を解決するための手段】
上述の目的を達成するため、本発明のスラッジ除去工事における給排水方法は、給水タンクにおいて純水にヒドラジンを調整しながら混入して洗浄水を作り、該洗浄水を熱交換器のスラッジ除去対象部に給水し、洗浄後の洗浄水を排水受けタンクに貯留し、該タンクの下流において洗浄水に対し、フィルタによるスラッジ除去処理を行い、スラッジ除去後の洗浄水に対しイオン交換樹脂によるヒドラジンの浄化処理を行ったのち、洗浄水を排水し、スラッジ除去後の洗浄水の少なくとも一部を前記ヒドラジンの浄化処理を行う前に再循環水として必要に応じて前記熱交換器のスラッジ除去対象部に再循環水ラインにより分配給水するスラッジ除去工事における給排水方法において、洗浄水における導電率とヒドラジン濃度との相関関係を予め用意し、測定した洗浄水の導電率からヒドラジン濃度を連続的に算出すると共に、その導電率またはヒドラジン濃度を制御盤に常時表示する工程と、前記の算出されたヒドラジン濃度が正常値ではない場合に作業者に警報を発する工程と、前記フィルタとして袋型多層式フィルタを用意し、洗浄後の洗浄水をこのフィルタの内側から外側に流し、フィルタ使用前後の乾燥重量差からスラッジ除去量を得る工程と、排水受けタンクに水位計を設けると共に前記イオン交換樹脂への流路入口に樹脂処理流量制御弁を設け、該排水受けタンクの水位に応じて前記樹脂処理流量制御弁の開閉を自動調整し、該排水受けタンクの水位を制御する工程と、再循環水ラインに流量計及び再循環流量制御弁を設け、該流量計の測定値に応じて該再循環流量制御弁の開閉を自動調整し、再循環水ラインの流量を設定値に自動制御する工程とを含むことを特徴とする。
【００１８】
また、同目的を達成するため、本発明のスラッジ除去工事における給排水システムは、給水タンクにおいて純水にヒドラジンを調整しながら混入して洗浄水を作り、該洗浄水を熱交換器のスラッジ除去対象部に給水する給水設備と、洗浄後の洗浄水を排水受けタンクに貯留し、該タンクの下流において洗浄水に対しフィルタによるスラッジ除去処理を行い、スラッジ除去後の洗浄水に対しイオン交換樹脂塔によるヒドラジンの浄化処理を行ったのち排水する排水処理設備と、スラッジ除去後の洗浄水の少なくとも一部を前記ヒドラジンの浄化処理を行う前に再循環水として必要に応じて前記熱交換器のスラッジ除去対象部に分配給水する再循環水ラインとを備えたスラッジ除去工事における給排水システムにおいて、前記給水タンクの出口及び前記イオン交換樹脂塔の出口にそれぞれ配置された給水側及び排水側の導電率測定装置と、前記導電率測定装置がオンライン接続され、予め用意された洗浄水における導電率とヒドラジン濃度との相関関係から、該導電率測定装置によって測定された洗浄水の導電率に基づいてヒドラジン濃度を連続的に算出すると共に、その導電率またはヒドラジン濃度を制御盤に常時表示し、前記の算出されたヒドラジン濃度が正常値ではない場合に作業者に警報を発する制御盤と、前記フィルタとして洗浄後の洗浄水が内側から外側に向けて流通される袋型多層式フィルタと、フィルタ使用前後の乾燥重量差からスラッジ除去量を得るため前記袋型多層式フィルタを乾燥させる乾燥機と、前記排水受けタンクに設けられた水位計と前記イオン交換樹脂塔の入口に設けられた樹脂処理流量制御弁とを備え、該排水受けタンクの水位に応じて前記樹脂処理流量制御弁の開閉が自動調整される排水受けタンク水位制御手段と、再循環水ラインに設けられた流量計及び再循環流量制御弁を備え、該流量計の測定値に応じて該再循環流量制御弁の開閉が自動調整される再循環水ライン流量制御手段とを備えたことを特徴とする。
【００１９】
また、同目的を達成するための本発明の洗浄装置は、原子力発電設備の熱交換器をヒドラジン水にて洗浄する洗浄装置であって、上記のスラッジ除去工事における給排水システムにおける洗浄後の洗浄水を貯留する前記排水受けタンクと、該タンクの洗浄水よりスラッジを除去する前記フィルタと、スラッジ除去後の洗浄水中のヒドラジンを浄化処理する前記イオン交換樹脂塔と、洗浄水の導電率を測定する前記導電率測定装置と、導電率に基づいてヒドラジン濃度を算出又は表示する前記制御盤と、前記フィルタを乾燥させる前記乾燥機とが、単一のコンテナ内に収容されていることを特徴とする。
【００２０】
【発明の実施の形態】
以下、この発明に係る給排水方法並びに給排水システムを、原子力発電設備における蒸気発生器内の二次側管板上に堆積している金属スラッジ成分を除去するスラッジランシング工事に適用した場合の実施の形態を添付図面に基づいて説明する。
【００２１】
図１において、給水設備１は、給水タンク２、ヒドラジンポンプ３、ヒドラジンタンク４、給水ポンプ５を備え、純水６にヒドラジンンを調整しながら混入して、洗浄水７を作る。洗浄水７は、前記給水ポンプ５や給水側オンライン導電率測定装置８を介して、高圧ジェットポンプ９へ給水される。
【００２２】
洗浄設備１０は、従来の洗浄設備５８の構成と同一であり、管板Ｄ上の二次側に堆積する金属スラッジ成分を洗い流すとともに、その洗浄排水１１、１２を蒸気発生器Ａ外に配設された排水ポンプ１３により屋外へ排水する設備である。
【００２３】
排水処理設備１４は、前述の洗浄設備１０からの洗浄排水（洗浄水）１１、１２を受ける排水受けタンク１５、排水処理ポンプ１６、スラッジ回収バグフィルタ１７、バックアップバグフィルタ１８、カチオン樹脂塔１９、排水側オンライン導電率測定装置２０、清浄水２４を貯留する放流タンク２２、放流ポンプ２３等を備えている。これら排水受けタンク１５、排水処理ポンプ１６、スラッジ回収バグフィルタ１７、バックアップバグフィルタ１８、カチオン樹脂塔１９、オンライン導電率測定装置２０の設備構成機器は、コンテナ１４ａ内に収容されており、コンテナ１４ａ内の設備構成機器は、工事に際してコンテナ単位でまとめて移動・設置される。従来は、これらの設備構成機器に相当する機器は、工事現場の敷地にその都度、平置きに設置され、更にその周囲には風雨をしのぐための仮設小屋まで設置しなければならなかった。しかしながら、本発明においては、コンテナ１４ａを適当な移動手段により移動させることで現場が移っても容易に設備を構築することが可能となっている。また、コンテナ１４ａ内には、電気制御を行う制御盤２１と、スラッジ回収バグフィルタ１７の使用後の乾燥を行うため乾燥機３４とが設けられている。制御盤２１には、前述のオンライン導電率測定装置８及び２０がオンライン接続されている。
【００２４】
図１及び図２、図３に基づき、本発明が従来行われていた蒸気発生器スラッジランシング工事と相違する特徴について説明する。
【００２５】
まず、従来、給水設備５１においては、作業者が洗浄水サンプル５７を採取して、ヒドラジン濃度分析☆１（図５）を行っていたが、本発明では、給水ポンプ５のバイパスラインにオンライン導電率測定装置８を設け、ヒドラジン濃度測定値を制御盤２１に常時表示するとともに、ヒドラジン濃度設定値の異常時には警報を発信する手段を設けている。すなわち、制御盤２１は、オンライン導電率測定装置８で得た導電率を表示すると共に、予め用意してあるヒドラジン濃度及び導電率の相関関係とからヒドラジン濃度を算出しかかる濃度が異常値にあるか否かを管理し、異常状態の場合には作業者に警報を発する。したがって、ヒドラジン分析要員やヒドラジン濃度管理要員等の省力化が図れる。
【００２６】
また、従来、排水処理設備６５においては、前述の洗浄設備５８から排水された排水６３、６４を作業者がサンプル採取し、スラッジ濃度分析☆２、☆３（各８０回／ＳＧ）を行い、洗浄期間中、２系統の排水をミリポア濾過紙により濾過し、濾過前後の乾燥重量を測定したものを平均し、積算流量を乗じて回収スラッジ量を評価していたが、本発明では、高性能のスラッジ回収バグフィルタ１７及びバックアップバグフィルタ１８の採用により、スラッジ全量をバグフィルタに回収し、乾燥機３４による乾燥後、バグフィルタ使用後乾燥重量を測定して、回収スラッジ量を評価することとし、サンプル採取作業者の省力化を図っている。すなわち、本発明のスラッジ回収用のフィルタは、複数の袋状のフィルタ部材を袋の筒状部が同心的に層をなすように重ね合わせて構成された、スラッジ捕集効率９９パーセント以上の袋型多層式フィルタを用い、排水中のスラッジを全量回収することができ、評価精度が従来よりも向上している。また、かかるフィルタに対して排水は袋型フィルタの内側から外側へと流通されるため、排水中のスラッジはフィルタの内側に回収残存される。よって、回収効率や精度の向上だけでなく、乾燥作業や重量測定作業に際してのフィルタの移送も容易である。また、乾燥機３４はコンテナ１４ａ内に配置されているため、作業者の乾燥作業は容易に行うことができる。
【００２７】
また、従来は、排水受けタンク６７の水位計７９を常時監視しながら、作業者が手動弁調整作業☆４（図６）を行っていたが、本発明では、排水処理ポンプ１６は事前に排水受けタンク１３にミニフロー循環待機運転で運転しておき、排水１１、１２の受入れに伴う排水受けタンク１３の水位計２５の変動により、排水受けタンク１３の水位を制御盤２１に表示すると共に、水位計２５とカチオン樹脂塔１９入り口の樹脂処理流量制御弁２７とを制御用回線２７ａで接続し、水位計２５の水位により樹脂処理流量制御弁２７を自動作動させ、カチオン樹脂塔１９を介して清浄水２４を放流タンク２２に移送して、排水受けタンク１３の適量水位を自動制御する手段としている。また、前記樹脂処理流量制御弁２７の作動状況が制御盤に表示されるようにしている。さらに、排水受けタンク１３内部に高低２個のリミットスイッチ２６を設け、排水受けタンク１３水位の異常時には警報を発信することとしている。このような自動制御、制御盤表示、警報などの手段によって、従来のような作業者の常時水位計を監視する労力や、手動弁調整のための作業がなくなり、作業者の省力化が図れる。
【００２８】
また、従来は、排水カートリッジフィルタ６９及び再循環水カートリッジフィルタ７０で処理したスラッジ除去水７１の一部を再循環水７３として、作業者が再循環流量計７８を常時監視しながら手動弁による再循環調整作業☆５（図６）により供給していたが、本発明では、スラッジ除去水２８の一部を再循環水として蒸気発生器Ａに供給する再循環水ライン２９に、流量ダイアル設定式の再循環（積算／瞬間）流量計３０を設け、この流量計の計測値を制御盤２１に表示すると共に、再循環流量計３０と再循環流量制御弁３１とを制御用回線３２で接続して、再循環流量制御弁３１を自動作動させ、再循環流量を設定値に自動制御する手段としている。また、再循環流量制御弁３１の作動状況が制御盤に表示されるようにしており、設定値に対する再循環流量の異常時には警報を発信する手段を設けている。これにより、手動弁調整作業がなくなり、作業者の省力化すなわちコスト低減が図られた。
【００２９】
さらに、従来は、蒸気発生器Ａからの洗浄排水を４基のバグフィルタ６６と、４基の排水カートリッジフィルタ６９、２基の再循環カートリッジフィルタ７０等合計１０基を使用していたが、本発明では、高性能フィルタの採用により、２基のスラッジ回収バグフィルタ１７、１基のバックアップフィルタ１８等合計３基としてフィルタ設備のコンパクト化を図っている。なお、本発明は、高性能のフィルタを合計３基使用することに限定されるものではなく、フィルタの性能アップ、またはスラッジ処理所要量により、フィルタの設置数量を増減することも可能である。
【００３０】
また、従来は、放流タンク７５に貯留するとき、カチオン樹脂塔出口７４から作業者がサンプル採取し、ヒドラジン濃度分析☆６（図６）をしていたが、本発明では、給水設備におけるヒドラジン濃度分析と同様に、カチオン樹脂塔１９処理後、オンライン導電率測定装置２０による導電率を制御盤２１に表示し、ヒドラジン濃度を監視しながら、その濃度が設定値に対して異常となった場合には、警報を発信する手段を設けている。したがって、給水設備におけるヒドラジン濃度分析の場合と同様に、ヒドラジン分析要員やヒドラジン濃度管理要員等の省力化が図れる。
【００３１】
また、従来は、工事毎に単品機器の設置及び系統接続等の準備・片付け作業を実施していたが、本発明では、上記のように、高性能フィルタ等の採用により、設備量が簡素化されるので、排水受けタンク１５、排水処理ポンプ１６、スラッジ回収バグフィルタ１７、バックアップバグフィルタ１８、カチオン樹脂塔１９、オンライン導電率測定装置２０及びそれらの付属機器（記載省略）を一括してコンテナ１４ａ内に配設することができ、排水処理設備のユニット化・トレーラ内恒設積載化が可能となり、作業者の組立・解体作業量の低減を図ることができた。
【００３２】
さらに上記を総合すると、従来は、排水処理設備６５では作業者が排水処理ポンプ６８運転操作、手動弁操作及び各種サンプル採取分析作業等を実施しながら排水処理作業を進捗していたが、本発明では事前に排水処理ポンプ１６をミニフロー待機循環運転しておくことで、排水１１、１２の受入れに対して制御盤２１の監視のみで排水処理作業を進捗でき、大幅な作業者の省力化が図れるシステムとなり大幅なコスト低減が図れる。さらに、設備運転状態を制御盤２１にて一括監視でき、各種異常が生じた場合は警報発信によりいち早く状態を把握することができ、速やかに対処することができる。
【００３３】
なお、この発明に係る給排水方法並びに給排水システムは、原子力発電設備における蒸気発生器内のスラッジランシング工事に適用されることに限定されず、スラッジ除去対象としては、スラッジが堆積し得る熱交換器に広く含むものとする。
【００３４】
【発明の効果】
以上説明したように、本発明のスラッジ除去工事における給排水方法及び給排水システム、ヒドラジン検出装置、洗浄装置によれば、従来、作業者の手作業により進められている作業量を少なくし、作業者の労務コストを低減することでき、熱交換器のスラッジ除去工事において能率的な給排水を行うことが可能となった。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る給排水システムの概要を示す図である。
【図２】本発明の実施の形態に係る給排水システムの給水設備の系統図である。
【図３】本発明の実施の形態に係る給排水システムの排水処理設備の系統図である。
【図４】従来の給排水システムの概要を示す図である。
【図５】従来の給排水システムの給水設備の系統図である。
【図６】従来の給排水システムの排水処理設備の系統図である。
【符号の説明】
１…給水設備、２…給水タンク、８…給水側の導電率測定装置、１４…排水処理設備、１４ａ…コンテナ、１５…排水受けタンク、１７，１８…袋型多層式フィルタ、１９…イオン交換樹脂塔、２０…排水側の導電率測定装置、２１…制御盤、２５…水位計、２７…樹脂処理流量制御弁、２９…再循環水ライン、３０…再循環流量制御弁、３１…流量計、３４…乾燥機。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water supply / drainage method, a water supply / drainage system, a hydrazine detection device, and a cleaning device in sludge removal work in a heat exchanger.
[0002]
[Prior art]
In nuclear power generation facilities, periodic inspections (hereinafter referred to as regular inspections) are carried out with the prescribed operational progress. During this regular inspection, the metal deposited on the steam generator secondary tube sheet during operation. The construction that removes and discharges sludge components is called the steam generator sludge lance construction, and the equipment that performs this construction is divided into three types: water supply equipment, cleaning equipment, and wastewater treatment equipment.
[0003]
FIG. 4 shows a conceptual diagram of sludge lance construction of a steam generator for a nuclear power generation facility that has been conventionally performed. A is a steam generator (hereinafter also referred to as “SG”), B is an outer wall of a nuclear power generation facility (indoors, a radiation control area), C is a heat transfer tube, D is a tube plate (provided in the steam generator A) The upper side from the tube plate D is called the secondary side.
[0004]
The water supply facility 51 includes a water supply tank 52, a hydrazine pump 53, a hydrazine tank 54, and a water supply pump 55, hydrazine is adjusted to pure water 56, and water is supplied to the high-pressure jet pump 59 through the water supply pump 55 as cleaning water 57. Equipment.
[0005]
The cleaning equipment 58 is disposed outside the steam generator A, the high pressure jet pump 59 disposed outdoors, the cleaning device (robot) 60 inserted on the secondary side on the tube plate D in the steam generator A, and the steam generator A. Metal sludge which is composed of two drainage pumps 61 and the like, moves on the tube plate D, and deposits on the secondary side on the tube plate D using the high pressure water 62 of the high pressure jet pump 59. In addition to washing away the components, the waste water 63 and 64 is drained to the outside by the drain pump 61.
[0006]
The waste water treatment equipment 65 receives the washing waste water 63 and 64 from the washing equipment 58 and receives the bag filter 66, the waste water receiving tank 67, the waste water treatment pump 68, the waste water cartridge filter 69, the recirculation cartridge filter 70, and the cation resin tower 72. The equipment is constituted by a discharge tank 75, a discharge pump 77, and the like, and the cleaning wastewater 63, 64 is purified by filtration with a filter or a resin tower to be discharged water 76, which is stored in the discharge tank 75 and then discharged. The sludge removal water 71 processed by the recirculation cartridge filter 70 may be used as the recirculation water 73 for the cleaning water on the tube plate D.
[0007]
FIG. 5 is a system diagram of the water supply facility 51 in the conventional steam generator sludge lance work, and FIG. 6 is a system diagram of the waste water treatment facility 65 in the steam generator sludge lance work.
[0008]
Based on FIG.4, FIG.5, FIG.6, the working condition of the steam generator sludge lance construction performed conventionally is demonstrated. In the water supply facility 51, hydrazine is mixed into the pure water 56 stored in the water supply tank 52 from the hydrazine tank 54 via the hydrazine pump 53, and used as cleaning water 57. Here, the operator collects the cleaning water 57 from the water supply tank 52 and performs hydrazine concentration analysis * 1 (performed about 50 times when supplying one SG). During the cleaning period, the cleaning water 57 is a predetermined amount. After confirming that the hydrazine concentration is adjusted, water is supplied to the high-pressure jet pump 59 via the water supply pump 55.
[0009]
In the wastewater treatment facility 65, an operator samples the wastewater 63 and 64 drained from the above-described cleaning facility 58, and performs sludge concentration analysis ☆ 2, ☆ 3 (80 times per SG), and Millipore Filtered with a filter paper, measured the dry weight before and after filtration, averaged, and multiplied by the integrated flow rate to evaluate the amount of recovered sludge.
[0010]
In addition, while maintaining the water level so that air does not enter the suction port of the drainage treatment pump 68 at the bottom of the drainage receiving tank 67, and the operator constantly monitors the water level gauge 79 so that the water level does not overflow. Then, the sludge removal water 71 is transferred as clean water 74 to the discharge tank 75 via the cation resin tower 72.
[0011]
Further, in the above-described cleaning equipment 58, in order to ensure the discharge of sludge on the tube plate D and to create a flow in the direction of the drain nozzle on the outer periphery of the tube plate D, the drain cartridge filter 69 and the recirculation water cartridge filter The sludge removal water 71 treated in 70 is supplied as recirculation water 73 by manual valve adjustment work ☆ 5 (as needed) while constantly monitoring the recirculation flowmeter 78.
[0012]
Further, the operator collects a sample of clean water 74 treated in the cation resin tower 72, and after hydrazine concentration analysis ☆ 6 (50 times / SG), the sample is stored in the discharge tank 75 and discharged as discharge water 76 via a discharge pump 77. Released.
[0013]
[Patent Document 1]
Japanese Patent Laid-Open No. 57-122994
[Problems to be solved by the invention]
However, in the conventional steam generator sludge lance construction described above, the amount of work being carried out manually by the operator, such as hydrazine concentration management, sludge evaluation amount management, drainage tank water level adjustment, recirculation flow rate adjustment work, etc., is large. In addition, since the work frequency is high, the labor cost of the worker increases.
[0015]
The present invention was made to solve the above-described problems, and can reduce the labor cost of workers, an efficient water supply / drainage method and system in a heat exchanger sludge removal work, a water supply / drainage system, a hydrazine detection device, An object is to provide a cleaning device.
[0016]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the water supply / drainage method in the sludge removal work of the present invention is to prepare cleaning water by mixing hydrazine into pure water in a water supply tank while preparing the cleaning water, and using the cleaning water as a sludge removal target part of the heat exchanger. water, and then stored in a tank receiving drain the wash water after washing, to wash water downstream of the tank, it performs a sludge removal process by the filter, purifying the hydrazine by an ion exchange resin to the washing water after sludge removal after performing processing, drained wash water, the sludge removal target portion of the heat exchanger as needed as a recirculating water before at least a portion of the wash water after sludge removal performing purification treatment of the hydrazine in plumbing method in sludge removal work distributing water by recirculating water line, the correlation between the conductivity and the hydrazine concentration in the wash water in advance in the The hydrazine concentration is calculated continuously from the measured washing water conductivity, and the conductivity or hydrazine concentration is always displayed on the control panel, and the calculated hydrazine concentration is not normal. In addition, a bag-type multilayer filter is prepared as the filter and the washing water after washing flows from the inside to the outside of the filter to obtain a sludge removal amount from a difference in dry weight before and after using the filter. A water level gauge is installed in the drainage receiving tank, and a resin processing flow rate control valve is provided at the inlet of the ion exchange resin, and the resin processing flow rate control valve is automatically adjusted according to the water level of the drainage receiving tank. And a step of controlling the water level of the drain receiving tank, and a flow meter and a recirculation flow control valve are provided in the recirculation water line, and the recirculation flow control is performed according to the measured value of the flow meter. The opening and closing of the automatic adjustment, characterized in that it comprises a step of automatically controlling the flow rate of the recirculating water line set value.
[0018]
In order to achieve the same purpose, the water supply / drainage system in the sludge removal work of the present invention creates cleaning water by mixing hydrazine while adjusting hydrazine in the water supply tank, and the cleaning water is subject to sludge removal in the heat exchanger. A water supply facility for supplying water to the water supply section, and the wash water after washing is stored in a drainage receiving tank, and the sludge is removed from the wash water by a filter downstream of the tank, and the ion exchange resin tower is applied to the wash water after removing the sludge Waste water treatment equipment for draining after the hydrazine purification treatment by the sludge, and at least a part of the washing water after sludge removal as sludge of the heat exchanger as recirculation water before the hydrazine purification treatment In the water supply / drainage system in the sludge removal work provided with the recirculation water line for distributing and supplying water to the removal target portion, Correlation between the conductivity and hydrazine concentration in the wash water prepared in advance, with the conductivity measuring device on the water supply side and the drain side respectively disposed at the outlet of the ion exchange resin tower, and the conductivity measuring device connected online. The hydrazine concentration is continuously calculated based on the conductivity of the washing water measured by the conductivity measuring device, and the conductivity or hydrazine concentration is always displayed on the control panel, and the calculated hydrazine concentration The control panel that issues an alarm to the worker when the value is not normal, the bag-type multilayer filter in which the wash water after washing flows from the inside to the outside as the filter, and the difference in dry weight before and after using the filter A dryer for drying the bag-type multilayer filter to obtain a sludge removal amount, a water level meter provided in the drain receiving tank, and the ion exchange resin A waste water receiving tank water level control means that automatically adjusts the opening and closing of the resin processing flow rate control valve according to the water level of the waste water receiving tank, and a recirculation water line. A recirculation water line flow rate control unit that includes a flow meter and a recirculation flow rate control valve provided, and that automatically adjusts the opening and closing of the recirculation flow rate control valve in accordance with a measured value of the flow meter. And
[0019]
Further , a cleaning device of the present invention for achieving the same object is a cleaning device for cleaning a heat exchanger of a nuclear power generation facility with hydrazine water, and the cleaning water after cleaning in the water supply / drainage system in the above sludge removal work measuring said drain receiver tank for storing, said filter for removing sludge from the washing water of the tank, and the ion-exchange resin tower for purification treatment with hydrazine in the wash water after sludge removal, the conductivity of the wash water said conductivity measuring device, and the control board for calculating or displaying hydrazine concentration based on conductivity, and the dryer for drying the filter, characterized in that it is housed in a single container .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in the case where the water supply / drainage method and the water supply / drainage system according to the present invention are applied to a sludge lance construction for removing metal sludge components accumulated on a secondary tube sheet in a steam generator in a nuclear power generation facility. Is described based on the attached drawings.
[0021]
In FIG. 1, a water supply facility 1 includes a water supply tank 2, a hydrazine pump 3, a hydrazine tank 4, and a water supply pump 5, and mixes pure water 6 while adjusting hydrazine to produce wash water 7. The washing water 7 is supplied to the high-pressure jet pump 9 through the water supply pump 5 and the water supply side online conductivity measuring device 8.
[0022]
The cleaning equipment 10 has the same configuration as that of the conventional cleaning equipment 58, and the metal sludge component deposited on the secondary side on the tube sheet D is washed away, and the washing drains 11 and 12 are disposed outside the steam generator A. This is a facility for draining outdoors by the drainage pump 13.
[0023]
The wastewater treatment facility 14 includes a drainage receiving tank 15 that receives the washing wastewater (washing water) 11 and 12 from the above-described washing facility 10, a wastewater treatment pump 16, a sludge collection bag filter 17, a backup bag filter 18, a cationic resin tower 19, A drain side on-line conductivity measuring device 20, a discharge tank 22 for storing clean water 24, a discharge pump 23, and the like are provided. The equipment components of the drainage receiving tank 15, the drainage treatment pump 16, the sludge collection bag filter 17, the backup bag filter 18, the cation resin tower 19, and the online conductivity measuring device 20 are accommodated in the container 14a. These equipment components are moved and installed in units of containers at the time of construction. Conventionally, the equipment corresponding to these equipment components has been installed flat on the site of the construction site each time, and further, a temporary hut for overcoming wind and rain has to be installed around the equipment. However, in the present invention, it is possible to easily construct equipment even if the site moves by moving the container 14a by an appropriate moving means. In addition, a control panel 21 that performs electrical control and a dryer 34 that performs drying after use of the sludge collection bag filter 17 are provided in the container 14a. The above-described online conductivity measuring devices 8 and 20 are connected to the control panel 21 online.
[0024]
Based on FIGS. 1, 2, and 3, features that are different from the steam generator sludge lance construction in which the present invention is conventionally performed will be described.
[0025]
First, in the water supply facility 51, the operator has collected the wash water sample 57 and conducted the hydrazine concentration analysis ☆ 1 (FIG. 5). However, in the present invention, on-line conduction is performed on the bypass line of the water supply pump 5. A rate measuring device 8 is provided, and a means for constantly displaying the hydrazine concentration measurement value on the control panel 21 and for issuing an alarm when the hydrazine concentration set value is abnormal is provided. That is, the control panel 21 displays the conductivity obtained by the on-line conductivity measuring device 8, calculates the hydrazine concentration from the correlation between the hydrazine concentration and the conductivity prepared in advance, and the concentration is an abnormal value. Whether or not is abnormal, an alarm is issued to the worker in an abnormal state. Therefore, it is possible to save labor for hydrazine analysis personnel, hydrazine concentration management personnel, and the like.
[0026]
Conventionally, in the wastewater treatment facility 65, the operator samples the wastewater 63 and 64 drained from the cleaning facility 58 and performs sludge concentration analysis ☆ 2, ☆ 3 (80 times / SG each), During the cleaning period, the drainage of two systems was filtered with Millipore filter paper, and the dry weight before and after filtration was averaged, and the amount of recovered sludge was evaluated by multiplying the integrated flow rate. The sludge collection bag filter 17 and the backup bag filter 18 are used to collect the entire amount of sludge in the bag filter, and after drying with the dryer 34, the dry weight after use of the bag filter is measured to evaluate the amount of collected sludge. In order to save labor for sample collection workers. That is, the sludge collection filter of the present invention is a bag having a sludge collection efficiency of 99% or more, which is formed by stacking a plurality of bag-shaped filter members so that the cylindrical portions of the bags are concentrically layered. The sludge in the waste water can be recovered in total using the type multilayer filter, and the evaluation accuracy is improved as compared with the conventional method. In addition, since the wastewater is circulated from the inside to the outside of the bag type filter with respect to such a filter, sludge in the wastewater is collected and remains inside the filter. Therefore, not only the recovery efficiency and accuracy are improved, but also the filter can be easily transferred during the drying operation and the weight measurement operation. Moreover, since the dryer 34 is arrange | positioned in the container 14a, a worker's drying operation can be performed easily.
[0027]
In the past, the operator performed manual valve adjustment work ☆ 4 (FIG. 6) while constantly monitoring the water level gauge 79 of the drain receiving tank 67. In the present invention, the drainage treatment pump 16 is drained in advance. The tank 13 is operated in a mini-flow circulation standby operation in the receiving tank 13, and the water level of the drain receiving tank 13 is displayed on the control panel 21 due to the fluctuation of the water level gauge 25 of the drain receiving tank 13 accompanying the receiving of the drainage 11, 12. The water level gauge 25 and the resin treatment flow rate control valve 27 at the entrance of the cation resin tower 19 are connected by a control line 27 a, and the resin treatment flow rate control valve 27 is automatically operated according to the water level of the water level gauge 25, via the cation resin tower 19. The clean water 24 is transferred to the discharge tank 22 to automatically control an appropriate amount of water level in the drain receiving tank 13. The operating status of the resin processing flow rate control valve 27 is displayed on the control panel. Furthermore, two high and low limit switches 26 are provided inside the drainage receiving tank 13, and an alarm is issued when the water level of the drainage receiving tank 13 is abnormal. By means of such automatic control, control panel display, alarm, etc., the conventional labor for constantly monitoring the water level gauge and the work for manual valve adjustment are eliminated, so that the labor can be saved.
[0028]
Further, conventionally, a part of the sludge removal water 71 treated by the drainage cartridge filter 69 and the recirculation water cartridge filter 70 is used as the recirculation water 73, and the operator uses the manual valve to recycle the recirculation flowmeter 78 while constantly monitoring the recirculation flowmeter 78. In the present invention, a part of the sludge removal water 28 is supplied to the steam generator A as a recirculation water. The recirculation (integration / instantaneous) flow meter 30 is provided, the measured value of the flow meter is displayed on the control panel 21, and the recirculation flow meter 30 and the recirculation flow control valve 31 are connected by a control line 32. Thus, the recirculation flow rate control valve 31 is automatically operated to automatically control the recirculation flow rate to the set value. In addition, the operating state of the recirculation flow rate control valve 31 is displayed on the control panel, and means for issuing an alarm when the recirculation flow rate is abnormal with respect to the set value is provided. As a result, manual valve adjustment work is eliminated, and labor saving, that is, cost reduction, is achieved.
[0029]
Further, conventionally, a total of 10 cleaning drainage from the steam generator A, such as four bag filters 66, four drainage cartridge filters 69, and two recirculation cartridge filters 70, are used. In the present invention, the use of a high-performance filter reduces the size of the filter equipment to a total of three units, such as two sludge collection bug filters 17 and one backup filter 18. Note that the present invention is not limited to using a total of three high-performance filters, and the number of installed filters can be increased or decreased by improving the performance of the filter or by the amount of sludge treatment required.
[0030]
Further, conventionally, when storing in the discharge tank 75, an operator took a sample from the cation resin tower outlet 74 and analyzed the hydrazine concentration ☆ 6 (FIG. 6). In the present invention, however, the hydrazine concentration in the water supply facility Similar to the analysis, after the treatment with the cation resin tower 19, the conductivity measured by the on-line conductivity measuring device 20 is displayed on the control panel 21, and the hydrazine concentration is monitored and the concentration becomes abnormal with respect to the set value. Has a means for transmitting an alarm. Therefore, as in the case of hydrazine concentration analysis in the water supply facility, labor savings such as hydrazine analysis personnel and hydrazine concentration management personnel can be achieved.
[0031]
In the past, preparation and tidying work such as installation of individual devices and system connection were carried out for each construction, but in the present invention, the amount of equipment is simplified by adopting a high-performance filter as described above. Therefore, the wastewater receiving tank 15, the wastewater treatment pump 16, the sludge collection bag filter 17, the backup bag filter 18, the cation resin tower 19, the online conductivity measuring device 20 and their associated devices (not shown) are collectively packaged. 14a, the wastewater treatment equipment can be unitized and the trailer can be permanently installed, and the amount of assembly and dismantling work for the operator can be reduced.
[0032]
Furthermore, when the above is summarized, conventionally, in the wastewater treatment facility 65, the worker has advanced the wastewater treatment work while performing the drainage treatment pump 68 operation operation, manual valve operation, various sample collection analysis work, etc. Then, the wastewater treatment pump 16 can be operated in a standby state for mini-flow standby in advance, so that the wastewater treatment work can be progressed only by monitoring the control panel 21 with respect to the acceptance of the wastewaters 11 and 12, and the labor saving of the worker can be greatly reduced. It becomes a system that can be planned, and a significant cost reduction can be achieved. Furthermore, the operation state of the equipment can be collectively monitored by the control panel 21, and when various abnormalities occur, the state can be quickly grasped by issuing an alarm, and can be dealt with promptly.
[0033]
In addition, the water supply / drainage method and the water supply / drainage system according to the present invention are not limited to being applied to sludge lance work in a steam generator in a nuclear power generation facility, and a sludge removal target is a heat exchanger on which sludge can be accumulated. Widely include.
[0034]
【The invention's effect】
As described above, according to the water supply / drainage method and water supply / drainage system, the hydrazine detection device, and the cleaning device in the sludge removal work of the present invention, the amount of work that has been conventionally performed manually by the operator is reduced. Labor costs can be reduced, and it has become possible to efficiently supply and drain water in sludge removal work for heat exchangers.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a water supply / drainage system according to an embodiment of the present invention.
FIG. 2 is a system diagram of a water supply facility of the water supply / drainage system according to the embodiment of the present invention.
FIG. 3 is a system diagram of a wastewater treatment facility of the water supply / drainage system according to the embodiment of the present invention.
FIG. 4 is a diagram showing an outline of a conventional water supply / drainage system.
FIG. 5 is a system diagram of a water supply facility of a conventional water supply / drainage system.
FIG. 6 is a system diagram of a wastewater treatment facility of a conventional water supply / drainage system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Water supply equipment, 2 ... Water supply tank, 8 ... Water supply side conductivity measuring device, 14 ... Waste water treatment equipment, 14a ... Container, 15 ... Waste water receiving tank, 17, 18 ... Bag type multilayer filter, 19 ... Ion exchange Resin tower, 20 ... Drain side conductivity measuring device, 21 ... Control panel, 25 ... Water level meter, 27 ... Resin treatment flow control valve, 29 ... Recirculation water line, 30 ... Recirculation flow control valve, 31 ... Flow meter 34 ... Dryer.

Claims

In the water supply tank, hydrazine is mixed with pure water while making it to make washing water, the washing water is supplied to the sludge removal target part of the heat exchanger, and the washing water after washing is stored in the drain receiving tank. to wash water downstream of, it performs a sludge removal process by the filter, after performing the purification treatment of the hydrazine according to the ion exchange resin to the washing water after sludge removal, drain the wash water, the wash water after sludge removal In the water supply / drainage method in the sludge removal work in which water is distributed and supplied to the sludge removal target part of the heat exchanger as needed by the recirculation water line as the recirculation water before at least a part of the hydrazine purification treatment ,
A step of preparing a correlation between the conductivity and hydrazine concentration in the wash water in advance, continuously calculating the hydrazine concentration from the measured wash water conductivity, and constantly displaying the conductivity or hydrazine concentration on the control panel; ,
Issuing an alarm to the operator if the calculated hydrazine concentration is not normal;
A bag-type multilayer filter is prepared as the filter, the wash water after washing is flowed from the inside to the outside of the filter, and a sludge removal amount is obtained from a difference in dry weight before and after using the filter;
A drainage tank is provided with a water level meter and a resin treatment flow rate control valve is provided at the flow path inlet to the ion exchange resin, and the resin treatment flow rate control valve is automatically adjusted according to the water level of the drainage receptacle tank, A process for controlling the water level in the drainage receiving tank;
A flow meter and a recirculation flow control valve are installed in the recirculation water line, and the opening and closing of the recirculation flow control valve is automatically adjusted according to the measured value of the flow meter, and the flow of the recirculation water line is automatically controlled to the set value. A method for supplying and draining water in sludge removal work, comprising the step of:

In the water supply tank, hydrazine is mixed with pure water while making it to make wash water, and the wash water is supplied to the sludge removal target part of the heat exchanger, and the wash water after washing is stored in the drain receiving tank. The waste water treatment equipment which drains water after the sludge removal process by the filter is performed downstream of the tank, the hydrazine is purified by the ion exchange resin tower for the wash water after the sludge removal, and the sludge removal Water supply / drainage in sludge removal work provided with a recirculation water line that distributes and supplies water to the sludge removal target portion of the heat exchanger as necessary as recirculation water before performing purification treatment of the hydrazine at least part of the washing water In the system,
A conductivity measuring device on the water supply side and drainage side respectively disposed at the outlet of the water supply tank and the outlet of the ion exchange resin tower,
The conductivity measuring device is connected online, and the hydrazine concentration is continuously determined based on the conductivity of the cleaning water measured by the conductivity measuring device based on the correlation between the conductivity and the hydrazine concentration in the cleaning water prepared in advance. A control panel that constantly displays the conductivity or hydrazine concentration on the control panel, and issues an alarm to the operator when the calculated hydrazine concentration is not a normal value ;
A bag-type multilayer filter in which washing water after washing is distributed from the inside to the outside as the filter,
A dryer for drying the bag-type multilayer filter in order to obtain a sludge removal amount from a difference in dry weight before and after using the filter;
A water level meter provided in the drain receiving tank and a resin processing flow control valve provided at the inlet of the ion exchange resin tower, and the resin processing flow control valve is automatically opened and closed according to the water level of the drain receiving tank. A drainage tank water level control means to be adjusted;
A recirculation water line flow control means comprising a flow meter and a recirculation flow control valve provided in the recirculation water line, wherein the opening and closing of the recirculation flow control valve is automatically adjusted according to the measured value of the flow meter; plumbing system in the sludge removal work, characterized by comprising br />.

A cleaning apparatus for cleaning a heat exchanger of a nuclear power generation facility with hydrazine water, wherein the drainage receiving tank for storing the cleaning water after cleaning according to claim 2 and sludge is removed from the cleaning water in the tank said filter, said ion exchange resin tower for purification treatment with hydrazine in the wash water after sludge removal, and the conductivity measuring device for measuring the conductivity of the wash water, is calculated or displayed hydrazine concentration based on the conductivity cleaning apparatus and the control board, and the dryer for drying the filter, characterized in that it is housed in a single container.