JPH0632813B2 - Cleaning method of multi-stage flash evaporation type water production system - Google Patents
Cleaning method of multi-stage flash evaporation type water production systemInfo
- Publication number
- JPH0632813B2 JPH0632813B2 JP59226912A JP22691284A JPH0632813B2 JP H0632813 B2 JPH0632813 B2 JP H0632813B2 JP 59226912 A JP59226912 A JP 59226912A JP 22691284 A JP22691284 A JP 22691284A JP H0632813 B2 JPH0632813 B2 JP H0632813B2
- Authority
- JP
- Japan
- Prior art keywords
- washing
- brine
- flash evaporation
- evaporation chamber
- evaporation
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
- B01D3/065—Multiple-effect flash distillation (more than two traps)
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Description
【発明の詳細な説明】 〔本発明の産業分野〕 本発明は、多段フラツシユ蒸発型造水装置（以下MSFE型
造水装置と略記する。）の運転停止，保管中の腐食防止
や該装置内部に付着する汚物，スケール等を除去するMS
FE型造水装置の洗浄方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of the present invention] The present invention relates to the stoppage of operation of a multi-stage flash evaporation desalination apparatus (hereinafter abbreviated as MSFE type desalination apparatus), the prevention of corrosion during storage, and the inside of the apparatus. MS that removes dirt, scale, etc. adhering to the surface
The present invention relates to a cleaning method for an FE type water freshener.
一般に、MSFE型海水淡水化装置は、第３図に示すよう
に、上部に個々に凝縮器１を備えた多段の蒸発室２から
なるエバポレータ本体と、蒸発室２と凝縮器１の間にブ
ラインを循環させる循環ポンプ３、循環ブラインを外部
ボイラなどからの蒸気で加熱するブラインヒータ４、補
給する海水を脱気する脱気器５、蒸発室２を真空に引く
エジエクター６などからなる。なお、７はオリフイス部
である。Generally, as shown in FIG. 3, the MSFE type seawater desalination apparatus has an evaporator body composed of a multi-stage evaporation chamber 2 provided with a condenser 1 at the top, and a brine between the evaporation chamber 2 and the condenser 1. It comprises a circulation pump 3 for circulating water, a brine heater 4 for heating circulation brine with steam from an external boiler, a deaerator 5 for deaerating the seawater to be replenished, an ejector 6 for evacuating the evaporation chamber 2 and the like. In addition, 7 is an orifice part.
エバポレータ本体は一般にステンレス／炭素鋼のクラツ
ド鋼や炭素鋼，凝縮器チユーブは、キユープロニツケル
やチタン材等が使用されており、運転中は、海水は脱気
器５で脱気して供給され、蒸発室２では、循環ブライン
は、pH8.5〜9.0で、真空でフラツシユ蒸発が行われるた
め、溶存酸素１０PPb以下になり、装置の腐食は殆んど
問題ない。The evaporator body is generally made of stainless steel / carbon steel such as clad steel or carbon steel, and the condenser tube is made of Kyupro nickel or titanium material. During operation, seawater is degassed and supplied by the deaerator 5. In the evaporation chamber 2, the circulating brine has a pH of 8.5 to 9.0 and flash evaporation is performed in a vacuum, so that the dissolved oxygen is 10 PPb or less, and there is almost no problem of corrosion of the apparatus.
しかし、運転を停止し、装置内部が一旦大気にさらされ
ると、海水及び海水を濃縮した循環ブラインは、腐食性
が大きくなり、たとえこのブラインを液抜きしても、装
置内壁に付着した海塩粒子が腐食の原因となり、停止期
間中に装置が腐食し、問題となつている。However, once the operation is stopped and the inside of the equipment is exposed to the atmosphere, the seawater and the circulating brine concentrated seawater become highly corrosive, and even if the brine is drained, sea salt adhered to the inner wall of the equipment The particles cause corrosion, which is a problem because the equipment corrodes during the outage.
したがつて従来、MSFE型海水淡水化装置は液抜きした
後、(1)清水で内部をホース洗滌し、モツプ掛けした
り、(2)或いは清水を張り込んで循環する操作を２〜３
回繰り返すなどの対策を行つている。しかし、上記(1)
の方法は現在中近東で稼動中の大型実装置では、１基の
大きさが長さ６０ｍ，巾１８ｍ，高さ３ｍで内部が２０
数室に分かれており、洗滌，モツプ掛けに大変な労力と
費用がかかつている。Therefore, conventionally, after draining the MSFE type seawater desalination equipment, (1) Rinse the inside of the hose with fresh water, mop it, and (2) or put fresh water and circulate it for 2-3 operations.
We are taking measures such as repeating it once. However, above (1)
In the large-scale equipment currently operating in the Middle East, the size of one unit is 60 m in length, 18 m in width, 3 m in height and 20 inside.
It is divided into several rooms, and it takes a lot of labor and cost to clean and mop.
また、(2)の方法は清水を張り込んだ深さの範囲までし
か洗浄できず、常温で、各蒸発室の段間は液レベル差の
みで流れるため、オリフイスの流動抵抗分だけ前段の液
位が順次高くなり、後方段の上部壁は殆んど洗滌できな
い問題があつた。また、液の流れはおだやかで、温度も
低いため洗滌に時間がかかり、３〜４回張り込みを繰り
返すため、多量の清水が必要などの問題があつた。In addition, the method (2) can clean only up to the depth range where fresh water is poured, and at room temperature, only the liquid level difference between the stages of each evaporation chamber causes the flow resistance of the orifice to be the same as the liquid in the previous stage. The rank gradually increased, and there was a problem that the upper wall of the rear stage could hardly be washed. Further, since the flow of the liquid is gentle and the temperature is low, it takes a long time to wash the product, and since the filling is repeated 3 to 4 times, a large amount of fresh water is required.
本発明は、MSFE型造水装置の流動特性と装置が備える機
器を利用して、上記問題点を解決する効果的なMSFE型造
水装置の洗滌方法を提供することを目的とする。An object of the present invention is to provide an effective MSFE-type desalination apparatus cleaning method that solves the above-mentioned problems by utilizing the flow characteristics of the MSFE-type desalination apparatus and the equipment included in the apparatus.
そして、本発明は、上記目的を達成する手段として、ブ
ラインヒータに加熱蒸気を供給し、蒸発室は真空状態に
抽気してフラツシユ蒸発させ装置内部を洗滌する点にあ
る。すなわち、本発明は多段フラツシユ蒸発型造水装置
で、運転を停止し、ブライン液抜き後、洗滌水（清水）
を蒸発室に供給し、循環ポンプで凝縮器，ブライン・ヒ
ータ，蒸発室間を循環さして各装置内を洗滌する方法に
おいて、ブライン・ヒータに加熱蒸気を供給し、蒸発室
は真空状態に抽気して、フラツシユ蒸発させ装置内部を
洗滌することを特徴とする多段フラツシユ蒸発型造水装
置の洗浄方法である。And, as a means for achieving the above object, the present invention is to supply heated steam to a brine heater, extract the evaporation chamber into a vacuum state and flash-evaporate it to wash the inside of the apparatus. That is, the present invention is a multi-stage flash evaporation type water producing apparatus, in which the operation is stopped, the brine is drained, and then the washing water (fresh water) is used.
Is supplied to the evaporation chamber, and a circulation pump circulates between the condenser, the brine heater, and the evaporation chamber to wash the inside of each device. In this method, heating steam is supplied to the brine heater and the evaporation chamber is evacuated to a vacuum state. Then, the method is a method for cleaning a multi-stage flash evaporation type water producing apparatus, characterized in that the inside of the apparatus is washed by flash evaporation.
以下１〜２図に基づいて本発明を従来の洗滌手段と対比
して詳細に説明する。第１〜２図は凝縮器−蒸発室の一
部拡大横断面図であり、この内第１図は本発明の洗滌方
法を説明するための図であり、第２図は従来の洗滌方法
を説明するための図である。Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 2 are partially enlarged transverse sectional views of a condenser-evaporation chamber, in which FIG. 1 is a diagram for explaining a cleaning method of the present invention, and FIG. 2 is a conventional cleaning method. It is a figure for explaining.
従来の洗滌方法では、第２図に示すように、オリフイス
部７を介しての単なる液循環方式で蒸発室１を洗滌する
ものである。In the conventional washing method, as shown in FIG. 2, the evaporation chamber 1 is washed by a simple liquid circulation method through the orifice portion 7.
これに対して、本発明はブラインヒータに加熱蒸気を供
給し、次いで蒸発室２を真空状態で抽気してフラツシユ
蒸発させる方法であり、この方法によつて、第１図に示
すように、オリフイス部７で液は烈しく、沸騰蒸発を起
し、スプラツシユ（飛沫）が飛散し、上部内壁に吹きつ
け、洗滌する。又、構造上スプラツシユが直接吹きつけ
難い部分も、蒸発蒸気が壁面で冷され、その凝縮水で壁
面は常に洗われた状態になり、付着した海塩粒子など充
分洗い落すことができる。温度が高いことも又洗滌には
効果的である。On the other hand, the present invention is a method of supplying heated steam to a brine heater and then extracting the evaporation chamber 2 in a vacuum state to flash-evaporate, and by this method, as shown in FIG. The liquid is violent in part 7 and evaporates by boiling, splashing splashes (splashes), spraying on the inner wall of the upper part, and washing. Further, even in the portion where the splash is difficult to directly blow due to the structure, the vaporized vapor is cooled on the wall surface, and the wall surface is always washed by the condensed water, and the adhering sea salt particles can be sufficiently washed off. The high temperature is also effective for washing.
この参考例で使用した装置は次のものである。 The apparatus used in this reference example is as follows.
短管式MSFE型海水淡水化装置 蒸発能力：２３，０００ton/day 装置寸法：６５mL×２０mW×４mH 段数：２２段 上記装置を使用しての洗滌方法（従来法）は次のとおり
である。ブライン液抜き後、清水を張り込み循環洗滌
（第１回目洗滌）し、この洗滌液を液抜きし、再度清水
を張り込みし循環洗滌（第２回目洗滌）した。この２回
の循環洗滌時の蒸発室初段入口の循環液の電導度を追跡
した。Short tube type MSFE type seawater desalination equipment Evaporation capacity: 23,000ton / day Equipment size: 65m L × 20m W × 4m H Number of stages: 22 stages The washing method (conventional method) using the above equipment is as follows. is there. After draining the brine solution, fresh water was poured to perform a circulation wash (first wash), the wash solution was drained, and fresh water was added again to perform a circulation wash (second wash). The electrical conductivity of the circulating liquid at the inlet of the first stage of the evaporation chamber during the two circulation washings was traced.
上記第１回目洗滌及び第２回目洗滌の電導度追跡結果を
第４図及び第５図に示す。この第４〜５図から明らかな
ように、ブライン液抜き後、装置内の液抜き困難なデツ
ドスペースに残つたブラインが洗滌水の循環と共に周期
的に高い電導度を示し、２〜３時間（３〜５回）の循環
で簡単に一様にはならない（即ち洗滌出来ない）ことを
示している。また、装置内壁に付着していたＣ濃度は
１００cm2当り洗滌前５０mgに対し、上記２回目洗滌後
は1.2mgであつた。洗滌液に浸されていない上部壁は４
５mgで洗滌前と略同時であつた。The results of the electric conductivity tracings of the above-mentioned first and second washings are shown in FIGS. 4 and 5. As is clear from FIGS. 4 to 5, after draining the brine, the brine left in the dead space inside the device where drainage is difficult to drain periodically exhibits a high electrical conductivity as well as circulation of the washing water, and it is possible to remove the brine for 2 to 3 hours (3 It is shown that it cannot be easily made uniform (that is, it cannot be washed) in circulation of 5 times. Further, the C concentration adhering to the inner wall of the apparatus was 50 mg per 100 cm 2 before washing, and 1.2 mg after the second washing. 4 for the upper wall which is not soaked in the washing liquid
It was 5 mg at about the same time as before washing.
この実施例で使用する装置は、上記参考例で使用した装
置と同一であるが、洗滌方法としてはブライン液抜き
後、清水を張り込み、常温で２時間循環洗滌し、この洗
滌液を液抜きし、再度清水を張り込み、初段温度が９０
℃での真空フラツシユ蒸発状態まで昇温した後、４時間
のフラツシユ蒸発状態での循環洗滌を行なつた。The apparatus used in this example is the same as the apparatus used in the above reference example, but as a washing method, after draining the brine solution, it is filled with fresh water, circulated and washed at room temperature for 2 hours, and the washing solution is drained. , Once again filled with fresh water, the first stage temperature was 90
After the temperature was raised to the vacuum flash evaporation state at 0 ° C., circulation washing in the flash evaporation state was performed for 4 hours.
このフラツシユ蒸発洗滌時の電導度変化を第６図に示
す。第６図から明らかなように、電導度の経時変化は従
来方法と大差はない。しかし、装置内壁に付着していた
洗滌後のＣ濃度は液レベルより下部は1.00cm2当り１m
g以下、上部壁で0.3〜２mgであり、よく洗滌されてい
た。FIG. 6 shows the change in electric conductivity during the flash cleaning by evaporation. As is clear from FIG. 6, the change in conductivity with time is not so different from the conventional method. However, the C concentration after washing on the inner wall of the device was 1 m per 1.00 cm 2 below the liquid level.
Less than g, 0.3-2 mg on top wall, well washed.
本発明は、以上詳記したように、ブラインヒータに加熱
蒸気を供給し、次いで蒸発室において真空状態に抽気し
てフラツシユ蒸発させて装置内部を洗滌する方法である
から、装置内部にスプラツシユ（飛沫）が飛散し、上部
内壁に吹きつけることにより装置内部を十分に洗滌する
ことができる効果を奏するものである。また、構造上ス
プラツシユ（飛沫）が直接吹きつけ難い部分も蒸発蒸気
が壁面で冷却され、その濃縮水で壁面は常に洗われた状
態になり、付着している海塩粒子など充分に洗い落すこ
とができる効果が生ずるものである。以上のように本発
明では、MSFE型造水装置の運転停止中及び保管中の腐食
が完全に防止でき、装置内部に付着する汚物，スケール
などを完全に除去できる顕著な効果が生ずるものであ
る。As described in detail above, the present invention is a method in which heating steam is supplied to a brine heater, and then the vapor is extracted into a vacuum state in an evaporation chamber to flash-evaporate to wash the inside of the apparatus. ) Is scattered and sprayed on the inner wall of the upper part, so that the inside of the apparatus can be sufficiently washed. Also, the vaporized vapor is cooled by the wall surface even where it is difficult to directly spray the splash due to the structure, and the wall surface is always washed with the concentrated water, and the adhering sea salt particles should be thoroughly washed off. The effect of being able to do is produced. As described above, in the present invention, it is possible to completely prevent corrosion during the operation stop and storage of the MSFE type desalination apparatus, and to obtain a remarkable effect of completely removing dirt, scale, etc. adhering to the inside of the apparatus. .
第１図及び第２図は凝縮器−蒸発室の一部拡大横断面図
であつて、この内第１図は本発明の洗滌方法を説明する
ための図であり、第２図は従来の洗滌方法を説明するた
めの図である。第３図はMSFE型造水装置の代表的な系統
図である。第４図及び第５図は従来法による第１回目洗
滌及び第２回目洗滌の電導度追跡結果を示し、第６図は
本発明によるフラツシユ蒸発洗滌時の電導度変化を示
す。 １……凝縮器 ２……蒸発室 ３……循環ポンプ ４……ブラインヒータ ５……脱気器 ６……エジエクター ７……オリフイス部1 and 2 are partially enlarged transverse sectional views of a condenser-evaporating chamber, in which FIG. 1 is a view for explaining a cleaning method of the present invention, and FIG. 2 is a conventional one. It is a figure for demonstrating a washing method. Fig. 3 is a typical system diagram of the MSFE type desalination equipment. FIGS. 4 and 5 show the results of tracing the electric conductivity of the first washing and the second washing by the conventional method, and FIG. 6 shows the electric conductivity change at the flush evaporation washing according to the present invention. 1 …… Condenser 2 …… Evaporation chamber 3 …… Circulation pump 4 …… Brine heater 5 …… Deaerator 6 …… Ejector 7 …… Olifis portion
───────────────────────────────────────────────────── フロントページの続き (72)発明者 服部 一男 東京都千代田区丸の内２丁目５番１号 三 菱重工業株式会社内 (56)参考文献 特開 昭51−121602（ＪＰ，Ａ) 特公 昭59−11321（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuo Hattori 2-5-1, Marunouchi, Chiyoda-ku, Tokyo Sanryo Heavy Industries Co., Ltd. (56) References JP-A-51-121602 (JP, A) JP 59-11321 (JP, B2)
Claims (1)
停止し、ブライン液抜き後、洗浄水（清水）を蒸発室に
供給し、循環ポンプで凝縮器，ブライン・ヒータ，蒸発
室間を循環さして各装置内を洗滌する方法において、ブ
ライン・ヒータに加熱蒸気を供給し、蒸発室は真空状態
に抽気して、フラツシユ蒸発させ装置内部を洗滌するこ
とを特徴とする多段フラツシユ蒸発型造水装置の洗浄方
法。1. A multi-stage flash evaporation type water production system, in which operation is stopped, brine liquid is drained, washing water (clean water) is supplied to the evaporation chamber, and a circulation pump is used to connect between the condenser, the brine heater and the evaporation chamber. In a method of circulating and washing the inside of each device, heating steam is supplied to a brine heater, the evaporation chamber is bleed to a vacuum state, and flash evaporation is performed to wash the inside of the device, thereby creating a multi-stage flash evaporation type desalination. How to clean the equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59226912A JPH0632813B2 (en) | 1984-10-30 | 1984-10-30 | Cleaning method of multi-stage flash evaporation type water production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59226912A JPH0632813B2 (en) | 1984-10-30 | 1984-10-30 | Cleaning method of multi-stage flash evaporation type water production system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61107986A JPS61107986A (en) | 1986-05-26 |
| JPH0632813B2 true JPH0632813B2 (en) | 1994-05-02 |
Family
ID=16852545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59226912A Expired - Lifetime JPH0632813B2 (en) | 1984-10-30 | 1984-10-30 | Cleaning method of multi-stage flash evaporation type water production system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0632813B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102029886B1 (en) * | 2018-07-20 | 2019-10-08 | 주식회사 동화엔텍 | Fresh Water generator in vessels capable of flushing the evaperator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51121602A (en) * | 1975-04-18 | 1976-10-25 | Mitsubishi Heavy Ind Ltd | A chemical cleaning method in combination with vaccum suction |
| DE3220012A1 (en) * | 1982-05-27 | 1983-12-01 | Akzo Gmbh, 5600 Wuppertal | POLYAETHER DERIVATIVES AND THE USE THEREOF AS DISPERGATORS IN MEANS FOR SOFT RINSING OF TEXTILES BASED ON QUATERNAUS AMMONIUM SALTS |
-
1984
- 1984-10-30 JP JP59226912A patent/JPH0632813B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61107986A (en) | 1986-05-26 |
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