JP3322798B2 - Membrane deaerator using circulation of sealing water - Google Patents
Membrane deaerator using circulation of sealing waterInfo
- Publication number
- JP3322798B2 JP3322798B2 JP20301296A JP20301296A JP3322798B2 JP 3322798 B2 JP3322798 B2 JP 3322798B2 JP 20301296 A JP20301296 A JP 20301296A JP 20301296 A JP20301296 A JP 20301296A JP 3322798 B2 JP3322798 B2 JP 3322798B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- tank
- sealed
- membrane
- seal
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は封水を循環使用する膜脱
気装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a membrane deaerator for circulating and using sealed water.
【０００２】[0002]
【従来の技術】気液分離膜により流路側と減圧側に区分
した膜モジュールと、膜モジュール減圧側に接続した水
封式の真空ポンプを使用し、液体中の溶存気体を真空吸
引する脱気処理方法が広く行われている。真空ポンプに
使用される封水は、実開平３−５９００４号公報に記載
されているように、循環させて再利用することで節水化
している。しかし、真空ポンプから封水タンクへ戻され
る循環水は、膜モジュールにて脱気した気体と混合され
た状態で戻されているため、塩素ガスや炭酸ガスといっ
た気体が循環水に再溶存することとなり、循環を繰り返
すことで溶存気体濃度が上昇し、封水循環ラインに腐食
環境を作り出すこととなっていた。2. Description of the Related Art Degassing is performed by using a membrane module divided into a flow path side and a decompression side by a gas-liquid separation membrane, and using a water-sealed vacuum pump connected to the decompression side of the membrane module to vacuum-dissolve dissolved gas in a liquid. Processing methods are widely used. As described in Japanese Utility Model Application Laid-Open No. 3-59004, the water sealed in the vacuum pump is circulated and reused to save water. However, since the circulating water returned from the vacuum pump to the water sealing tank is returned in a state of being mixed with the gas degassed by the membrane module, gases such as chlorine gas and carbon dioxide gas must be redissolved in the circulating water. Then, by repeating the circulation, the dissolved gas concentration was increased, and a corrosive environment was created in the sealing water circulation line.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、封水を循環使用する膜脱気装置において、
封水循環ラインでの腐食を防止することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a membrane deaerator that circulates and uses sealed water.
An object of the present invention is to prevent corrosion in a sealing water circulation line.
【０００４】[0004]
【課題を解決するための手段】真空ポンプが接続され、
内部を気液分離膜によって流路側と減圧側に区分した膜
モジュールへ原水を供給し、原水中の溶存気体を減圧側
へ吸引する膜脱気装置であって、上記真空ポンプに、膜
モジュールへ送られている原水との間で熱交換を行う熱
交換器とタンク内水位を調整する水位調整手段を設けた
封水タンクを有する封水循環ラインを接続し、封水を循
環使用している膜脱気装置において、真空ポンプから封
水タンクへ戻される循環水の一部を封水循環ラインから
分岐させて排水する。真空ポンプ稼働時には封水の微量
排水を行い、新鮮な水を補給することで封水中の溶存気
体濃度が上昇するのを防止する。A vacuum pump is connected,
A membrane deaerator that supplies raw water to a membrane module divided into a flow path side and a decompression side by a gas-liquid separation membrane, and sucks dissolved gas in the raw water to a decompression side. A membrane that connects a heat exchanger that performs heat exchange with the raw water being sent and a sealing water circulation line that has a sealing water tank provided with a water level adjustment unit that adjusts the water level in the tank, and uses the sealing water in circulation. In the deaerator, a part of the circulating water returned from the vacuum pump to the water sealing tank is branched off from the water sealing circulation line and drained. When the vacuum pump is operating, a small amount of sealed water is drained and fresh water is supplied to prevent the dissolved gas concentration in the sealed water from increasing.
【０００５】[0005]
【発明の実施の形態】本発明の一実施例を図面を用いて
説明する。図１は気液分離膜によって容器内部を流路側
と減圧側に区画し、減圧側に真空ポンプ９を接続してい
る膜モジュール７によって脱気を行う膜脱気装置の概要
のフローシートである。脱気装置へ通水する原水および
脱気処理の行われた脱気水を溜める脱気水タンク１には
水位検出装置２と原水供給制御弁３を設けておき、水位
検出装置２からの信号によって原水供給制御弁３を開閉
することで脱気水タンク内の水位を一定の高さに調整す
る。脱気水タンク１に溜められた原水を膜モジュール７
へ送り脱気処理を行う脱気ライン１１には、脱気水タン
ク１側から順に原水入口弁４、循環ポンプ５、プレフィ
ルター６、熱交換器８、膜モジュール７を設け、得られ
た脱気水は脱気水使用側および脱気水タンクのどちらに
も送れるように配管を接続しておく。真空ポンプ９は膜
モジュール７の減圧側と真空ライン１７によって接続し
ておき、真空ライン１７の途中に真空電磁弁１８を設け
る。脱気ライン１１のプレフィルター６と熱交換器８の
間に、脱気ライン１１から分岐させた封水補給ライン１
２を設け、封水補給ライン１２は封水タンク１０へ接続
し、封水補給ライン１２の途中に封水タンク１０内の水
位によって弁の開閉を行うボールタップ１３を設ける。
また、封水タンク１０内には水位がオーバーフロー開口
部１９よりも高くなった場合に排水を行うオーバーフロ
ー管１５を設けておくことで封水タンク１０内の水位を
一定に保つ。封水タンク１０に溜められた封水は封水循
環ライン１４によって熱交換器８へ送られ、熱交換器８
で膜モジュール７へ送られている脱気ライン１１の水と
熱交換後に真空ポンプ９へ送られて、封水として使用さ
れる。使用された封水は封水タンク１０内へ戻される
が、封水タンク１０内に設けた封水循環ライン１４先端
近くには、オーバーフロー開口部１９真上にあたる部分
に循環水排水口１６を設けておき、封水循環ライン１４
を戻ってきた封水の一部は循環水排水口１６からオーバ
ーフロー管１５へ排水されるようにする。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a flow sheet showing an outline of a membrane deaerator in which the inside of a container is partitioned into a flow path side and a decompression side by a gas-liquid separation membrane, and deaeration is performed by a membrane module 7 having a vacuum pump 9 connected to the decompression side. . A water level detecting device 2 and a raw water supply control valve 3 are provided in a deaerated water tank 1 for storing raw water passing through the deaerator and deaerated water subjected to a deaeration process, and a signal from the water level detecting device 2 is provided. By opening and closing the raw water supply control valve 3, the water level in the deaerated water tank is adjusted to a constant height. The raw water stored in the deaerated water tank 1 is transferred to the membrane module 7
A raw water inlet valve 4, a circulation pump 5, a pre-filter 6, a heat exchanger 8, and a membrane module 7 are provided in this order from the deaerated water tank 1 side. The piping is connected so that steam can be sent to both the degassed water usage side and the degassed water tank. The vacuum pump 9 is connected to the reduced pressure side of the membrane module 7 by a vacuum line 17, and a vacuum solenoid valve 18 is provided in the middle of the vacuum line 17. Between the pre-filter 6 and the heat exchanger 8 in the deaeration line 11, the water supply line 1 branched from the deaeration line 11
2, the water supply line 12 is connected to the water supply tank 10, and a ball tap 13 that opens and closes a valve according to the water level in the water supply tank 10 is provided in the water supply line 12.
Further, by providing an overflow pipe 15 for draining when the water level becomes higher than the overflow opening portion 19 in the water sealing tank 10, the water level in the water sealing tank 10 is kept constant. The sealed water stored in the sealed water tank 10 is sent to the heat exchanger 8 by the sealed water circulation line 14,
After the heat exchange with the water in the deaeration line 11 being sent to the membrane module 7, the water is sent to the vacuum pump 9 and used as water sealing. The used sealing water is returned into the sealing tank 10, and a circulating water discharge port 16 is provided near the tip of the sealing circulation line 14 provided in the sealing tank 10 at a portion directly above the overflow opening 19. Water sealing line 14
Is returned to the overflow pipe 15 from the circulating water discharge port 16.
【０００６】脱気処理を行う場合、まず原水が原水供給
制御弁３を通して脱気水タンク１に溜められる。脱気水
タンク１内へ溜められた原水は、原水入口弁４を開き、
循環ポンプ５を稼働させることで脱気ライン１１内を送
られ、プレフィルター６にてろ過を行い、熱交換器８を
通して膜モジュール７へ通水される。膜モジュール７内
では減圧側を真空ポンプ９にて真空化しており、流路側
に原水を通すと、原水中に含まれていた溶存気体が気液
分離膜を通して減圧側に吸引される。脱気処理された水
は脱気水使用側へ送られるが、脱気水の供給量が需要量
よりも多くなった場合には、脱気水は脱気水タンク１へ
戻される。When performing the deaeration process, first, raw water is stored in a deaerated water tank 1 through a raw water supply control valve 3. The raw water stored in the deaerated water tank 1 opens the raw water inlet valve 4,
By operating the circulation pump 5, the water is sent through the deaeration line 11, filtered by the prefilter 6, and passed through the heat exchanger 8 to the membrane module 7. In the membrane module 7, the decompression side is evacuated by the vacuum pump 9, and when raw water is passed through the flow path side, dissolved gas contained in the raw water is sucked to the decompression side through the gas-liquid separation membrane. The degassed water is sent to the degassed water use side. If the supply amount of the degassed water exceeds the demand, the degassed water is returned to the degassed water tank 1.
【０００７】膜モジュール減圧側を真空化している真空
ポンプ９に使用される封水は封水タンク１０内の水を循
環させて使用しており、循環使用による封水温度の上昇
を防止するために、熱交換器８にて冷却後に真空ポンプ
９へ送られる。真空ポンプ９では封水循環ライン１４を
送られた封水で膜モジュール７の気体を吸引しており、
膜モジュール７からの気体と封水は封水タンク１０へ送
られる。封水タンク１０へ戻される封水の一部は循環水
排水口１６よりオーバーフロー開口部１９へ送られてお
り、真空ポンプ９稼働時には常に封水の一部が排水され
ることとなる。また、封水タンク１０へ送られた気体も
オーバーフロー管１５を通して排気される。封水を排水
することによって封水タンク１０内の水位が低下する
と、ボールタップ１３が開かれて封水補給ライン１２を
通して新鮮な水が補給される。[0007] The water used in the vacuum pump 9 for evacuating the reduced pressure side of the membrane module is used by circulating the water in a water sealing tank 10 in order to prevent an increase in the water sealing temperature due to circulating use. Then, it is sent to the vacuum pump 9 after being cooled in the heat exchanger 8. In the vacuum pump 9, the gas in the membrane module 7 is sucked by the sealed water sent through the sealed water circulation line 14,
The gas and water from the membrane module 7 are sent to a water sealing tank 10. Part of the sealed water returned to the sealed tank 10 is sent from the circulating water drain port 16 to the overflow opening 19, and when the vacuum pump 9 is operated, part of the sealed water is always drained. Further, the gas sent to the water sealing tank 10 is also exhausted through the overflow pipe 15. When the water level in the water sealing tank 10 is lowered by draining the water, the ball tap 13 is opened and fresh water is supplied through the water supply line 12.
【０００８】[0008]
【発明の効果】本発明を実施することにより、真空ポン
プ稼働時には常に封水の微量排水を行え、排水と補給を
行うことで封水中の溶存気体濃度の上昇を防止し、封水
循環ラインが腐食環境となることを防止できる。また、
真空ポンプ停止時には封水の排水は起きないので、水が
無駄に排水されることはない。By implementing the present invention, a very small amount of sealed water can be drained at all times when the vacuum pump is operating, and by increasing the amount of dissolved gas in the sealed water by performing drainage and replenishment, the sealing water circulation line is corroded. Environment can be prevented. Also,
Since the drainage of the sealed water does not occur when the vacuum pump is stopped, the water is not wastefully drained.
【図１】 本発明の一実施例のフローチャートFIG. 1 is a flowchart of an embodiment of the present invention.
１ 脱気水タンク ２ 水位検出装置 ３ 原水供給制御弁 ４ 原水入口弁 ５ 循環ポンプ ６ プレフィルター ７ 膜モジュール ８ 熱交換器 ９ 真空ポンプ １０ 封水タンク １１ 脱気ライン １２ 封水補給ライン １３ ボールタップ １４ 封水循環ライン １５ オーバーフロー管 １６ 循環水排水口 １７ 真空ライン １８ 真空電磁弁 １９ オーバーフロー開口部 DESCRIPTION OF SYMBOLS 1 Deaerated water tank 2 Water level detection device 3 Raw water supply control valve 4 Raw water inlet valve 5 Circulation pump 6 Prefilter 7 Membrane module 8 Heat exchanger 9 Vacuum pump 10 Water sealing tank 11 Deaeration line 12 Sealing replenishment line 13 Ball tap 14 Sealing water circulation line 15 Overflow pipe 16 Circulating water drain 17 Vacuum line 18 Vacuum solenoid valve 19 Overflow opening
Claims (2)
側に区分するとともに当該流路側に供給した原水から減
圧側へ溶存気体を吸引する膜モジュールと、水位を調整
する水位調整手段を持った封水タンクと、封水と前記膜
モジュールへ供給する原水との間で熱交換を行う熱交換
器と、真空ポンプと、封水タンクの封水を熱交換器と真
空ポンプを通って封水タンクに戻すようにこれらをこの
順序で接続する封水循環ラインとを有する、封水を循環
使用する膜脱気装置において、真空ポンプと封水タンク
との間の封水循環ラインに、封水の一部を該ラインから
分岐させて排水する循環水排水口を設けたことを特徴と
する封水を循環使用する膜脱気装置。The present invention has a membrane module that divides the inside into a flow path side and a decompression side by a gas-liquid separation membrane and sucks dissolved gas from raw water supplied to the flow path side to a decompression side, and a water level adjustment means for adjusting a water level. A sealed water tank, a heat exchanger for exchanging heat between the sealed water and the raw water supplied to the membrane module, a vacuum pump, and a sealed water tank.
Return these to the sealed tank through an empty pump
And a seal water circulation line connected in the order, in membrane degassing apparatus for recycling the water seal, the seal water circulation line between the vacuum pump and the water seal tank and a portion of the seal water is branched from the line A membrane deaerator that circulates and uses sealed water, characterized by having a circulating water drainage port for draining water.
脱気装置において、封水タンクにはオーバーフロー管を
設けておき、循環水排水口からの排水は、前記オーバー
フロー管に送り込む構成としたことを特徴とする封水を
循環使用する膜脱気装置。2. The membrane deaerator according to claim 1, wherein an overflow pipe is provided in the water sealing tank, and drainage from a circulating water drain is sent to the overflow pipe. A membrane deaerator that circulates and uses sealed water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20301296A JP3322798B2 (en) | 1996-07-12 | 1996-07-12 | Membrane deaerator using circulation of sealing water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20301296A JP3322798B2 (en) | 1996-07-12 | 1996-07-12 | Membrane deaerator using circulation of sealing water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1028805A JPH1028805A (en) | 1998-02-03 |
| JP3322798B2 true JP3322798B2 (en) | 2002-09-09 |
Family
ID=16466883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20301296A Expired - Fee Related JP3322798B2 (en) | 1996-07-12 | 1996-07-12 | Membrane deaerator using circulation of sealing water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3322798B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT16829U1 (en) * | 2019-10-30 | 2020-10-15 | Bvs Wassertechnik Gmbh | Membrane degassing device for separating gases from a fluid flow |
| JP7155373B1 (en) * | 2021-10-05 | 2022-10-18 | 野村マイクロ・サイエンス株式会社 | Method for operating liquid ring pump, membrane degassing device, pure water production system, and pure water production method |
-
1996
- 1996-07-12 JP JP20301296A patent/JP3322798B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1028805A (en) | 1998-02-03 |
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