JPS59127687A

JPS59127687A - Returning apparatus for processed water of low quality in desalination plant

Info

Publication number: JPS59127687A
Application number: JP58001590A
Authority: JP
Inventors: Toshiro Uchiyama; 内山　敏郎; Takashi Hirano; 隆平野
Original assignee: Hitachi Zosen Corp
Current assignee: Hitachi Zosen Corp
Priority date: 1983-01-07
Filing date: 1983-01-07
Publication date: 1984-07-23
Also published as: JPS632202B2

Abstract

PURPOSE:To withdraw water of low quality without suspending driving, by defining a conduit part for introducing water flowing from a water accepting part over a weir through a circulation opening provided at the partition wall of each stage to a withdrawal opening for processed water, and providing a returning pipe for water of low quality in an evaporation zone for brine. CONSTITUTION:Hot brine is supplied through a supply opening 9 to an evaporation zone 5 and flash evaporated at every time when it sequentially flows through the orifice 3 of each stage under a decompressed condition. Formed steam is sent through a mist removing member 7 into a condensation zone 6 and condensed therein. Condensed water is dropped onto a tray 4, let flow toward an opening 15 for falling water, collected therein, let flow downwards from the opening 15 for falling water to a water accepting part 18 at each stage and then accumulated. Processed water with which the water accepting part 18 of each stage is filled flows over a weir 17 to a conduit part 19 and then through a circulation opening 20 to a withdrawal opening 21 for processed water. Thus, the processed fresh water is withdrawn through the withdrawal opening 21.

Description

【発明の詳細な説明】この発明は、多段フラッシュ蒸発式の海水淡水化造水装
置における低水質生産水の戻し装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a return device for low quality produced water in a multi-stage flash evaporation seawater desalination system.

従来、この種の造水装置においては、多数の段のうちあ
る段で生産水の水質が低下すると、この低水質水を除く
ために、造水装置全体の運転を停止する必要があった。Conventionally, in this type of fresh water generating apparatus, when the quality of produced water deteriorates in one of the many stages, it has been necessary to stop the operation of the entire fresh water generating apparatus in order to remove the low quality water.

したがって造水装置の停止および再稼動による運転費の
ロスが著しく、その対策が望まれていた。Therefore, there is a significant loss in operating costs due to stopping and restarting the freshwater generator, and countermeasures have been desired.

この発明は上記の要望にこたえるべくなされたもので、
造水装置の運転を停止することなく、低水質水を抜取っ
て、循環ブラインに戻し、淡水の生産を続行することの
できる低水質生産水の戻し装置を提供することを目的ど
する。This invention was made in response to the above demands.
To provide a device for returning low-quality produced water, which can draw out low-quality water and return it to circulating brine to continue production of fresh water without stopping the operation of the water-producing device.

この発明による低水質生産水の戻し装置は、降水口を有
する凝縮水受はトレーの下面に各段にわたって降水口に
通じる収集水路が設けられ、収集水路内に路長方向に堰
が設けられて、堰によって収集水路が、降水口からの流
下水を受（プて各段ごとに瀬める受水部と、受水部から
の堰越え水を各段の仕切壁にあけられた通水口を経て生
産水取出し口へ導く導水部とに区分せられ、各段におい
て受水部からブラインの蒸発ゾーンにバルブ付き低水質
水戻し管が配されているものである。In the low water quality produced water return device according to the present invention, a condensed water receiver having a rain outlet is provided with a collection channel leading to the rain outlet over each stage on the bottom surface of the tray, and a weir is provided in the collection waterway in the direction of the path length. A collection channel is created by a weir, which receives the sewage from the rain outlet (a water receiving part that is lowered at each stage), and a water outlet that is opened in the partition wall of each stage to allow water from the water receiving part to flow over the weir. The system is divided into a water guide section that leads the water to the produced water outlet through the water receiving section, and a low-quality water return pipe with a valve is arranged at each stage from the water receiving section to the brine evaporation zone.

以下、このＲ明の実施例について具体的に説明する。Hereinafter, an example of this R-light will be explained in detail.

第１図から第３図において、ブライン循環式の造水装置
（１）は多数の垂直仕切壁（２）によって長さ方向に多
段に区分されている。各仕切壁（２）の下端部にはフラ
ッシコ用のオリフィス（３）があけられている。各段は
凝縮水を受けるためのトレー（４）によってそれぞれ下
側の蒸発ゾーン（５）と上側の凝縮ゾーン（６）に区分
され、両ゾーン（５）（６）はミスト除去部材（７）を
有する蒸気上昇路（８）によって連通されている。造水
装置（１）の一端部すなわち第１図にあける同装置（１
）の左端部には、一段目の蒸発ゾーン（５ａ）に通じる
ブラインの供給口（９）が設けられ、同他端部には最終
段の蒸発ゾーン（５ｔ）　）に通じる蒸発外ブラインの
排出口（１０）が設けられている。そして蒸発外ブライ
ンは排出口（１０）から装置外部を経て供給口（９）に
戻され、再び蒸発ゾーン（５）に循環される。濃縮ブラ
インは循環路から所要量抜取られる。排出口（１０）に
は海水補給口（１１）が設けられている。各段の凝縮ゾ
ーン（６）には、第３図に示すように、複数の支持板〈
１２）で束ねられた凝縮用の伝熱管束（１３）が設りら
れている。各支持板（１２）はトレー（４）との間にそ
れぞれ通水用の小間隙（１４）を有する。In FIGS. 1 to 3, a brine circulation type freshwater generator (1) is divided into multiple stages in the length direction by a large number of vertical partition walls (2). A flashcoorifice orifice (3) is provided at the lower end of each partition wall (2). Each stage is divided into a lower evaporation zone (5) and an upper condensation zone (6) by a tray (4) for receiving condensed water, and both zones (5) and (6) are separated by a mist removal member (7). They are communicated by a steam ascending path (8) having a. One end of the water generating device (1), that is, the device (1) that is opened in Figure 1.
) is provided with a brine supply port (9) leading to the first stage evaporation zone (5a), and the other end is provided with a brine discharge port (9) leading to the final stage evaporation zone (5t). An outlet (10) is provided. The evaporated brine is then returned to the supply port (9) from the discharge port (10) through the outside of the apparatus, and is again circulated to the evaporation zone (5). The required amount of concentrated brine is withdrawn from the circuit. A seawater replenishment port (11) is provided at the discharge port (10). The condensation zone (6) of each stage has a plurality of support plates <
A heat exchanger tube bundle (13) for condensing is provided, which is bundled with 12). Each support plate (12) has a small gap (14) for water passage between it and the tray (4).

造水装＠（１）の−側部すなわち第３図における同装置
（１）の左端部において、トレー（４）に降水口（１５
）があけられており、トレー（４）の下面にはその長さ
方向に各段の降水口（１５）に通じる収集水路（１Ｇ）
が設（プられている。収集水路（１６）内には路長方向
に堰（１７）が設けられ、堰（１７）によって収集水路
（１６）は受水部（１８）と導水部（１９）に区分され
ている。各段において受水部（１８）には降水口（１５
）が上から臨み、受水部（１８）は降水口（１５）から
の流下水を受けて各段ごとに溜めている。各仕切壁（２
）における導水部（１９）の部分にはそれぞれ通水口（
２０）がありられている。また造水装置（１）の他端−
側部には導水部（１９）に通じる生産水取出し口（２１
）が設けられている。そして導水部（１９）は受水部（
１８）からの堰越え水を生産水取出し口（２１〉へ導い
ている。At the negative side of the water generation system (1), that is, at the left end of the system (1) in Fig. 3, a rain outlet (15
) is opened, and on the bottom surface of the tray (4) there is a collection channel (1G) that leads to the rain outlet (15) at each level in the length direction.
A weir (17) is provided in the collection canal (16) in the length direction, and the weir (17) divides the collection canal (16) into a water receiving part (18) and a water guiding part (19). ).In each stage, the water receiving part (18) has a rain outlet (15
) is seen from above, and the water receiving section (18) receives the flowing water from the rain outlet (15) and stores it in each stage. Each partition wall (2
) is provided with a water inlet (
20) is true. Also, the other end of the water generator (1)
On the side, there is a produced water outlet (21) leading to the water guide section (19).
) is provided. And the water guiding part (19) is the water receiving part (
The water over the weir from 18) is guided to the produced water outlet (21>).

造水装置（１）の−側部には、受水部（１８）から同装
置の外部を経て蒸発ゾーン（５）に至る低水質水戻し管
（２２）が配されている。そして同情（２２）の装置外
部分にバルブ（２３）が設けられている。A low-quality water return pipe (22) is arranged on the negative side of the fresh water generator (1), which extends from the water receiving section (18) to the evaporation zone (5) via the outside of the device. A valve (23) is provided on the outside of the device (22).

上記構成の活水装置（１）において、各段の圧力はブラ
イン供給端から排出端に徐々に低下せられており、また
各段のバルブ（２３）はすべて閉じられている。スチー
ム・ヒータによって加熱せられた熱ブラインは、供給口
（９）から蒸発ゾーン（５）に供給され、各段のオリフ
ィス（３）を減圧下に順次通過するたびにフラッシュ蒸
発けられる。生じた水蒸気は蒸気上昇路（８）のミスト
除去部材（７）を経て凝縮ゾーン（６）に入り、凝縮さ
れる。凝縮水はトレー（４）に滴下し、トレー（１０）
上を降水口（１５）の方向に流れて収集せられ、収集水
は各段において降水口（１５）から収集水路（１６）の
受水部（１８）に流下して溜まる。各段において、受水
部（１８）を満した生産水は、ｌ１ｉ（１７）を越えて
導水部（１９）に溢流し、通水口（２０）を通って生産
水取出し口（２１）へ流れる。こうして取出し口（２１
）から淡水生産水が取出される。In the water activation device (1) configured as described above, the pressure at each stage is gradually lowered from the brine supply end to the discharge end, and all the valves (23) at each stage are closed. Thermal brine heated by the steam heater is supplied to the evaporation zone (5) through the supply port (9) and is flash evaporated as it passes successively under reduced pressure through the orifices (3) of each stage. The generated water vapor enters the condensation zone (6) through the mist removal member (7) of the steam riser path (8) and is condensed. The condensed water drips onto the tray (4) and then onto the tray (10).
Collected water flows from the top in the direction of the rain outlet (15) and is collected, and the collected water flows down from the rain outlet (15) at each stage to the water receiving part (18) of the collection channel (16) and collects therein. In each stage, the produced water that fills the water receiving section (18) overflows into the water guiding section (19) over the l1i (17) and flows to the produced water outlet (21) through the water inlet (20). . In this way, the outlet (21
) fresh water produced is extracted.

多数の段のうちある段において生産水の水質が低下した
場合には、その段のバルブ（２３）を開いて、低水質水
を戻し管（２２）によって蒸発ゾーン（５）へ流下させ
て、循環ブラインに合流させる。その他の段ではバルブ
（２３）は閉じたままである。If the quality of the produced water deteriorates in one of the multiple stages, the valve (23) of that stage is opened to allow the low quality water to flow down to the evaporation zone (5) via the return pipe (22); Combine with circulating brine. In the other stages the valve (23) remains closed.

以上のとおりで、この発明によれば、トレー（４）の下
面に各段の降水口（１５）に通じる収集水路（１Ｇ）が
設けられ、収集水路（１６）内にこれを受水部（１８）
と導水部（１９）に区分する堰（１７）が設けられ、受
木部（１８）から蒸発ゾーン（５）にバルブ（２３）付
き低水質水戻し管（２２）′が配されているので、ある
段において生産水の水質が低下した場合には、その段の
バルブ（２３）だけを開いて低水質水を戻し管（２２）
によって蒸発ゾーン（５）へ流下させ、循環ブラインに
合流させることができる。したがって生産水の水質が低
下していないその他の段では、バルブ（２３）を閉じな
いで、淡水の生産を続行することができ、そのため造水
装置（１）全体を停止する必要がなくて、装置の停止お
よび再稼動にＪ：る運転費のロスをなくすることができ
る。As described above, according to the present invention, the collection channel (1G) leading to the rain outlet (15) of each stage is provided on the lower surface of the tray (4), and the collection channel (1G) is connected to the water receiving section (1G) in the collection channel (16). 18)
A weir (17) is provided that separates the water into the water conveyance section (19), and a low quality water return pipe (22)' with a valve (23) is arranged from the tree receiving section (18) to the evaporation zone (5). If the quality of the produced water deteriorates at a certain stage, only the valve (23) of that stage is opened and the low quality water is returned to the pipe (22).
can flow down to the evaporation zone (5) and join the circulating brine. Therefore, in other stages where the quality of the produced water has not deteriorated, the production of fresh water can be continued without closing the valve (23), and therefore there is no need to stop the entire water production device (1). Loss of operating costs due to stopping and restarting equipment can be eliminated.

[Brief explanation of drawings]

図面はこの発明の実施例を示すもので、第１図は造水装
置の平面図、第２図は第１図中の■−■線に沿う中間省
略拡大断面図、第３図は第２図中の■−■線に沿う断面
図、第４図は第２図の要部拡大図、第５図は第４図中の
Ｖ−Ｖ線に沿う断面図、第６図は第４図中のＶｌ　−Ｖ
ｌ線に沿う断面図である。（１）・・・造水装置、（２〉・・・仕切壁、（３）。・・・オリフィス、（４）・・・トレー、（５）・・・
蒸発ゾーン、（６）・・・凝縮ゾーン、（７）・・・ミ
スト除去部材、（８）・・・蒸気上昇路、（９）・・・
供給口、（１０）・・・排水口、（１１）・・・海水補
給口、（１２）・・・支持板、（１３）・・・伝熱管束
、（１４）・・・小間隙、（１５）・・・降水口、（１
６）・・・収集水路、（１７）・・・堰、（１８）・・
・受水部、（１９）・・・導水部、（２０）・・・通水
口、（２１）・・・生産水取出口、（２２）・・・低水
質水戻し管、（２３）・・・バルブ。以　　上特許出願人　　日立造船　株式会社代　　理　　人　　　岸　　本　　瑛　　之　　助第４
図一一■ 第６図Ｉ　　Ｘ　　（１５１８１５The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of the fresh water generator, FIG. 2 is an enlarged cross-sectional view along the line ■-■ in FIG. 1, and FIG. Figure 4 is an enlarged view of the main part of Figure 2, Figure 5 is a cross-sectional view taken along line V-V in Figure 4, Figure 6 is Figure 4. Vl -V inside
FIG. (1)... Fresh water generator, (2>... Partition wall, (3)... Orifice, (4)... Tray, (5)...
Evaporation zone, (6)...Condensation zone, (7)...Mist removal member, (8)...Steam ascending path, (9)...
Supply port, (10)...Drain port, (11)...Seawater supply port, (12)...Support plate, (13)...Heat transfer tube bundle, (14)...Small gap, (15) ... Rainfall outlet, (1
6)...Collection channel, (17)...Weir, (18)...
・Water receiving part, (19)...Water conduction part, (20)...Water inlet, (21)...Produced water outlet, (22)...Low water quality water return pipe, (23)... ··valve. Patent applicant: Hitachi Zosen Co., Ltd. Agent: Einosuke Kishimoto No. 4
Figure 11■ Figure 6 IX (151815

Claims

[Scope of Claims] A condensate water receiver (1) having a condensate water receptacle (1) on the lower surface of the butray (4), which is connected to a condensate water outlet (15) at each level.
6) is provided, and a weir (
17) is provided and the collection channel (1
6) is a water receiving part (18) that receives the flowing water from the rain outlet (15) and stores it in each stage. The partition type (2
) and a water guide section (19) that leads to the produced water outlet (21) via the water inlet (20), and a brine evaporation zone (5) from the water receiving section (18) at each stage. )
A low water quality produced water return device in a fresh water production device, in which a low water quality water return pipe (22) with a valve (23) is arranged.