JPH0439501A - Method of clean-up - Google Patents
Method of clean-upInfo
- Publication number
- JPH0439501A JPH0439501A JP14612290A JP14612290A JPH0439501A JP H0439501 A JPH0439501 A JP H0439501A JP 14612290 A JP14612290 A JP 14612290A JP 14612290 A JP14612290 A JP 14612290A JP H0439501 A JPH0439501 A JP H0439501A
- Authority
- JP
- Japan
- Prior art keywords
- water
- heater
- pressure
- iron
- outlet
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052742 iron Inorganic materials 0.000 claims abstract description 31
- 238000004140 cleaning Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 5
- 239000008400 supply water Substances 0.000 abstract 4
- 238000007599 discharging Methods 0.000 abstract 1
- 230000003134 recirculating effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000010612 desalination reaction Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Landscapes
- Irons (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、火力発電プラントの試運転前に実施される高
圧クリーンアップ方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a high pressure cleanup method carried out before commissioning of a thermal power plant.
（従来の技術〕
ボイラ給水中に鉄１銅、シリカ等の不純物が含まれると
、ボイラチューブ内面でスケール化し伝熱阻害等の問題
を生しる。したがってボイラ給水中のスケール化成分を
極力低減するために洗浄（クリーンアップ）する必要が
あり、特に鉄濃度の低減が重要である。(Prior art) When impurities such as iron, copper, and silica are contained in boiler feed water, they scale on the inner surface of the boiler tube, causing problems such as heat transfer inhibition.Therefore, scale components in boiler feed water are reduced as much as possible. It is necessary to wash (clean up) to achieve this, and reducing the iron concentration is especially important.
第１図はブレボイラクリーンアノプラインの系統図であ
る。洗浄は、復水器１から脱塩装置２、低圧給水加熱器
３を経て脱気器４の出口に至る低圧給水系統を洗浄する
低圧クリーンアップと、脱気器４の出口から高圧給水加
熱器５の出口までの間の高圧給水系統（ポンプ類、配管
等を含む）を洗浄する高圧クリーンアップとに分けて行
なわれまず低圧クリーンアップにおいて、補給水は、図
示されていない蒸留水タンクから配管６を通して、復水
器１に補給される。復水器１の内部は図示されていない
真空ポンプによって減圧状態（約７００閣Ｈｇ）が保た
れている。給水は復水器１から配管７を通して復水脱塩
装置２に送られ、鉄分等の不純物が除去されたあと、配
管８、低圧給水加熱器３および配管９を経て、脱気器４
へと送られる。脱気器４では、加熱蒸気を投入して給水
の昇温と脱気が行なわれる。脱気器４を出た洗浄水は配
管１０を通して復水器１に戻される。低圧クリーンアッ
プ工程は脱気器４および低圧給水加熱器３の浄化が主体
である。Figure 1 is a system diagram of the Breboiler Clean Anoprine. Cleaning is a low-pressure cleanup that cleans the low-pressure water supply system from the condenser 1 through the desalination device 2 and the low-pressure feedwater heater 3 to the outlet of the deaerator 4, and a low-pressure cleanup that cleans the low-pressure water supply system from the condenser 1 to the outlet of the deaerator 4 through the desalination device 2 and the low-pressure feedwater heater 3. The process is divided into high-pressure cleanup, which cleans the high-pressure water supply system (including pumps, piping, etc.) up to the outlet of No. 6, the condenser 1 is replenished. The inside of the condenser 1 is maintained at a reduced pressure state (approximately 700 Hg) by a vacuum pump (not shown). The feed water is sent from the condenser 1 to the condensate demineralizer 2 through the pipe 7, and after removing impurities such as iron, it passes through the pipe 8, the low-pressure feed water heater 3, and the pipe 9, and is then sent to the deaerator 4.
sent to. In the deaerator 4, heated steam is input to raise the temperature of the feed water and degas it. Wash water exiting the deaerator 4 is returned to the condenser 1 through a pipe 10. The low-pressure cleanup process mainly involves cleaning the deaerator 4 and the low-pressure feed water heater 3.
上記低圧クリーンアップ工程終了後、給水は高圧クリー
ンアップのために高圧給水加熱器５に送られる。高圧給
水加熱器５出口の水質が復水脱塩装置２の通水基準値（
一般に鉄分は５００ｐｐｂ以下ｅ ｔｃ）をクリアする
までは、高圧給水加熱器５を出た水は配管１２から配管
１３を経て系外へ排出（高圧クリーンアップブロー）さ
れる。水質が通水基準値をクリアしたことを確認した後
は、配管１２から復水器１に戻される（高圧クリーンア
ップ循環）。After the low-pressure cleanup step, the feedwater is sent to the high-pressure feedwater heater 5 for high-pressure cleanup. The water quality at the outlet of the high-pressure feed water heater 5 is the water flow standard value of the condensate desalination device 2 (
In general, until the iron content is 500 ppb or less (etc), the water exiting the high-pressure feed water heater 5 is discharged from the system via the pipe 12 and the pipe 13 (high-pressure clean-up blow). After confirming that the water quality has cleared the water flow standard value, the water is returned to the condenser 1 through the pipe 12 (high-pressure cleanup circulation).
高圧クリーンアップ工程では高圧給水加熱器５の浄化が
主体である。なお配管１４は高圧給水加熱器５のバイパ
スラインであり、また符号１５は高圧クリーンアップ工
程終了後に図示されていないボイラ側へ給水する配管で
ある。The high-pressure cleanup process mainly involves cleaning the high-pressure feed water heater 5. Note that the pipe 14 is a bypass line of the high-pressure feed water heater 5, and the reference numeral 15 is a pipe that supplies water to the boiler side (not shown) after the high-pressure cleanup process is completed.
上記高圧クリーンアップ工程において、高圧給水加熱器
５の内部からイオン状あるいは微粒状の鉄が溶出し、高
圧給水加熱器５出口の鉄分濃度が高濃度で推移して、流
量スイングや温度スイングによる鉄分濃度の低減効果が
殆んど認められないことがある。そのような場合、従来
は高圧クリーンアップブローの状態で脱気器４のみ真空
を破壊し、高圧給水加熱器５へ送られる給水の溶存酸素
濃度を３〜５ｐｐ−まで上昇させた後、高圧給水加熱器
５の出入口弁を閉じて５〜１０時間程度の保管を行なっ
ている。なおこの保管時には、高圧給水加熱器バイパス
ライン１４に通水して脱気器４の真空上昇と加熱を行な
い、保管終了後は再度高圧給水加熱器５へ通水するなど
の方法がとられている。In the high-pressure cleanup process, iron in ionic form or fine particles is eluted from the inside of the high-pressure feed water heater 5, and the iron concentration at the outlet of the high-pressure feed water heater 5 remains at a high concentration. In some cases, almost no concentration reduction effect is observed. In such cases, conventionally, only the deaerator 4 breaks the vacuum during high-pressure clean-up blowing, and after raising the dissolved oxygen concentration of the feed water sent to the high-pressure feed water heater 5 to 3 to 5 pp-, the high-pressure feed water is The inlet/outlet valve of the heater 5 is closed and storage is performed for about 5 to 10 hours. During this storage, water is passed through the high-pressure feed water heater bypass line 14 to raise the vacuum of the deaerator 4 and heat the water, and after the storage is completed, water is passed through the high-pressure feed water heater 5 again. There is.
いずれにしても、高圧給水加熱器５内部の溶存酸素濃度
を上昇させ、給水加熱器５内部に存在する鉄錆の形態を
変えるのである。In any case, the dissolved oxygen concentration inside the high-pressure feed water heater 5 is increased and the form of iron rust present inside the feed water heater 5 is changed.
前記従来クリーンアップ方法には次のような欠点があっ
た。The conventional cleanup methods have the following drawbacks.
１）鉄分濃度の低減効果が不充分であった。処理後、高
圧給水加熱器５出口の鉄分濃度は一時的に低下するが、
数時間後には処理前の鉄分濃度とほぼ同等の値まで戻る
ため、高圧クリーンアップ工程の終了判定基準値（例え
ば鉄分濃度５０１１ｐｂ以下等）をクリアするのに長時
間を要するとともに純水使用量が非常に多くなる。1) The effect of reducing iron concentration was insufficient. After treatment, the iron concentration at the outlet of the high-pressure feed water heater 5 decreases temporarily, but
After a few hours, the iron concentration returns to almost the same value as before treatment, so it takes a long time to clear the high-pressure cleanup process termination criteria (for example, iron concentration of 5011 pb or less), and the amount of pure water used decreases. It becomes very large.
２）脱気器４の真空を破壊するので、−時的とはいえ、
脱気器４以降の溶存酸素濃度が高い状態で運転される。2) Since the vacuum of the deaerator 4 is destroyed, - albeit temporarily,
The deaerator 4 and subsequent parts are operated in a state where the dissolved oxygen concentration is high.
したがって高圧給水加熱器５以外の健全部における腐食
が懸念される。Therefore, there is a concern that corrosion may occur in healthy parts other than the high-pressure feed water heater 5.
３） 運転操作が複雑である。3) Driving operations are complicated.
４）工程遅延による損失（人工等）が非常に大きい。4) Losses due to process delays (man-made, etc.) are extremely large.
（課題を解決するための手段］
本発明は、前記従来の課題を解決するために、火力発電
プラントの脱気器の出口から高圧給水加熱器の出口に至
る高圧給水系統を洗浄する方法において、下記（１）な
いしく６）の手順を含むことを特徴とするクリーンアッ
プ方法を捉案するものである。(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention provides a method for cleaning a high-pressure water supply system from the outlet of a deaerator to the outlet of a high-pressure feedwater heater in a thermal power plant. The present invention proposes a cleanup method characterized by including the following steps (1) to 6).
すなわち、
（１）上記脱気器において蒸気により加熱された水を上
記高圧給水加熱器に供給する。That is, (1) Water heated by steam in the deaerator is supplied to the high pressure feed water heater.
（２）同高圧給水加熱器への通水を遮断する。(2) Cut off water flow to the high-pressure water heater.
（３）同高圧給水加熱器内の水をすべて系外に排出する
とともに、エアベントを開放し、所定時間放置する。(3) All the water in the high-pressure feed water heater is drained out of the system, the air vent is opened, and the heater is left for a predetermined period of time.
（４）同高圧給水加熱器内に水盛りする。(4) Pour water into the high-pressure water heater.
（５）同高圧給水加熱器に水を供給しつつその水を系外
に排出する。(5) While supplying water to the high-pressure water heater, the water is discharged from the system.
（６〕 同高圧給水加熱器の出口における鉄分濃度が
所定値以下になった後、同高圧給水加熱器に水を供給し
つつその水を上記火力発電プラントの復水器に循環させ
る。(6) After the iron concentration at the outlet of the high-pressure feedwater heater falls below a predetermined value, water is supplied to the high-pressure feedwater heater and the water is circulated to the condenser of the thermal power plant.
本発明方法においては、脱気器に加熱蒸気を投入し、高
圧給水加熱器内部の温度を上昇させた状態で、給水側の
保有水をすべて系外に排出（ブロー）することによって
、高圧給水加熱器の内部は高温度でしかも酸素が飽和状
態となる。そうすると、高圧給水加熱器内部においてイ
オン状あるいは微粒状の鉄分を溶出させていた鉄錆は、
充分に酸化され形態が変化する。こうして形態が変化し
た鉄錆は、再通水後容易に系外へ排出される。In the method of the present invention, heated steam is input into the deaerator to raise the temperature inside the high-pressure feed water heater, and all the water held on the water supply side is discharged (blown) out of the system. The inside of the heater is at a high temperature and is saturated with oxygen. Then, the iron rust that was eluting ionic or particulate iron inside the high-pressure feed water heater,
It is sufficiently oxidized and its morphology changes. The iron rust that has changed its shape in this way is easily discharged from the system after water is passed through the system again.
本発明方法の一実施例を前記第１図により説明する。脱
気器４に加熱蒸気を投入し、高圧給水加熱器５内部の温
度を少なくとも７０°Ｃ以上に上昇させた後、同高圧給
水加熱器５への通水を遮断する。An embodiment of the method of the present invention will be explained with reference to FIG. 1 above. After heating steam is introduced into the deaerator 4 and the temperature inside the high-pressure feed water heater 5 is raised to at least 70° C. or higher, water flow to the high-pressure feed water heater 5 is cut off.
そして通水系統を高圧ヒータバイパスライン１４あるい
は低圧クリーンアップライン１０に切替える。Then, the water flow system is switched to the high pressure heater bypass line 14 or the low pressure cleanup line 10.
次に同高圧給水加熱器５の給水側の保有水をすべて配管
１２．１３を経て系外に排出（全ブロー）するとともに
、給水ラインのエアベント１６を開放する。Next, all the water held on the water supply side of the high-pressure feed water heater 5 is discharged (completely blown) out of the system via the piping 12.13, and the air vent 16 of the water supply line is opened.
全ブロー終了約約２〜３時間そのままの状態で放置した
後、高圧給水加熱器５の給水側に水堰りを行なう。水温
り終了後は、高圧給水加熱器５に水を供給しつつその水
を系外に排出、すなわち高圧クリーンアップの系外ブロ
ーを実施する。そして、高圧給水加熱器５出口における
鉄分濃度が通水基準値以下になったことを確認後は、そ
れまで系外に排出していた水を復水器１へ循環させる、
すなわち高圧クリーンアップ循環に戻す。After the entire blowing process is completed and left as it is for about 2 to 3 hours, a water weir is made on the water supply side of the high pressure water heater 5. After the water has been heated, water is supplied to the high-pressure feed water heater 5 and the water is discharged from the system, that is, high-pressure clean-up blowing outside the system is carried out. After confirming that the iron concentration at the outlet of the high-pressure feed water heater 5 has become below the water flow standard value, the water that had been discharged outside the system is circulated to the condenser 1.
That is, return to high pressure cleanup circulation.
本実施例においては、高圧給水加熱器５を全ブロー状態
で放置している間に、高圧給水加熱器５内部の鉄錆は、
充分に酸化され形態が変っているから、通水再開後に容
易に系外へ排出される。In this embodiment, while the high-pressure feed water heater 5 is left in a fully blown state, iron rust inside the high-pressure feed water heater 5 is removed.
Since it has been sufficiently oxidized and its form has changed, it is easily discharged from the system after water flow is resumed.
次に新設の火力発電所（５００ＭＷ）で本発明方法を現
実に実施した実例について述べる。この発電所では、イ
ンシャルクリーンアップ時に、高圧給水加熱器内部から
イオン状あるいは微粒状の鉄分が溶出し、流量スイング
等による鉄分の低減効果が殆んど認められず、高圧給水
加熱器出口の鉄分濃度が２７０ｐｐｂ程度で推移してい
た。そこで本発明による方法を実施したところ、高圧給
水加熱器出口の鉄分濃度は一時的にＬｏｐρｂ以下を示
したが、数時間後に７０ρρｂ程度で安定した。再度、
本発明方法を実施した結果、高圧給水加熱器出口の鉄分
濃度は１ｏｐｐｂ以下となり、その後も鉄分濃度の上昇
はなく、１０ｐｐｂ以下で安定推移した。Next, an example will be described in which the method of the present invention was actually implemented at a newly constructed thermal power plant (500 MW). At this power plant, during initial cleanup, ionic or particulate iron was eluted from inside the high-pressure feedwater heater, and there was almost no effect of reducing iron content due to flow rate swings, etc. The iron concentration remained at around 270 ppb. Therefore, when the method according to the present invention was carried out, the iron concentration at the outlet of the high-pressure feed water heater temporarily showed a value below Lopρb, but stabilized at about 70ρρb after several hours. again,
As a result of carrying out the method of the present invention, the iron concentration at the outlet of the high-pressure feed water heater became 1 opppb or less, and thereafter the iron concentration did not increase and remained stable at 10 ppb or less.
［発明の効果］ 本発明によれば次の効果が得られる。[Effect of the invention] According to the present invention, the following effects can be obtained.
（１）従来の方法に比べ鉄分の低減効果が大きい。(1) The effect of reducing iron content is greater than that of conventional methods.
（２）脱気器等の健全部に対する影響がない。(2) There is no effect on healthy parts such as deaerators.
（３）純水使用量が少ない。(3) Less amount of pure water used.
（４）運転操作が簡単である。(4) Operation is easy.
（５）工程遅延による損失がなく、工程短縮による経費
！ｆｆｆ減効果が大きい。(5) No losses due to process delays, and costs due to process reduction! The fff reduction effect is large.
第１図は本発明方法が実施されるブレボイラクリーンア
ップラインの系統図である。
１・・・復水器、 ２・・・復水脱塩装置３・
・・低圧給水加熱器
５・・・高圧給水加熱器。
１６・・・エアベント。
４・・・脱気器
６〜１５・・・配管FIG. 1 is a system diagram of a bre boiler clean-up line in which the method of the present invention is implemented. 1... Condenser, 2... Condensate desalination device 3.
...Low pressure feed water heater 5...High pressure feed water heater. 16...Air vent. 4... Deaerator 6-15... Piping
Claims (1)
出口に至る高圧給水系統を洗浄する方法において、下記
（１）ないし（６）の手順を含むことを特徴とするクリ
ーンアップ方法。 （１）上記脱気器において蒸気により加熱された水を上
記高圧給水加熱器に供給する。 （２）同高圧給水加熱器への通水を遮断する。 （３）同高圧給水加熱器内の水をすべて系外に排出する
とともに、エアベントを開放し、所定時間放置する。 （４）同高圧給水加熱器内に水漲りする。 （５）同高圧給水加熱器に水を供給しつつその水を系外
に排出する。 （６）同高圧給水加熱器の出口における鉄分濃度が所定
値以下になった後、同高圧給水加熱器に水を供給しつつ
その水を上記火力発電プラントの復水器に循環させる。[Claims] A method for cleaning a high-pressure water supply system from the outlet of a deaerator to the outlet of a high-pressure feedwater heater in a thermal power plant, characterized by including the following steps (1) to (6): How to clean up. (1) Water heated by steam in the deaerator is supplied to the high pressure feed water heater. (2) Cut off water flow to the high-pressure water heater. (3) All the water in the high-pressure feed water heater is drained out of the system, the air vent is opened, and the heater is left for a predetermined period of time. (4) Fill the high pressure water heater with water. (5) While supplying water to the high-pressure water heater, the water is discharged from the system. (6) After the iron concentration at the outlet of the high-pressure feedwater heater falls below a predetermined value, water is supplied to the high-pressure feedwater heater and the water is circulated to the condenser of the thermal power plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14612290A JPH0439501A (en) | 1990-06-06 | 1990-06-06 | Method of clean-up |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14612290A JPH0439501A (en) | 1990-06-06 | 1990-06-06 | Method of clean-up |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0439501A true JPH0439501A (en) | 1992-02-10 |
Family
ID=15400651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14612290A Pending JPH0439501A (en) | 1990-06-06 | 1990-06-06 | Method of clean-up |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0439501A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003014884A (en) * | 2001-07-02 | 2003-01-15 | Mitsubishi Heavy Ind Ltd | Supply water purification apparatus and nuclear power facility |
| JP2019143899A (en) * | 2018-02-21 | 2019-08-29 | 三菱日立パワーシステムズ株式会社 | Water supply system cleanup apparatus and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122401A (en) * | 1989-10-02 | 1991-05-24 | Hitachi Ltd | Water supplying system clean-up device and clean-up method |
-
1990
- 1990-06-06 JP JP14612290A patent/JPH0439501A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122401A (en) * | 1989-10-02 | 1991-05-24 | Hitachi Ltd | Water supplying system clean-up device and clean-up method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003014884A (en) * | 2001-07-02 | 2003-01-15 | Mitsubishi Heavy Ind Ltd | Supply water purification apparatus and nuclear power facility |
| JP2019143899A (en) * | 2018-02-21 | 2019-08-29 | 三菱日立パワーシステムズ株式会社 | Water supply system cleanup apparatus and method |
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