JPH0729111B2 - Silica scale removal method - Google Patents
Silica scale removal methodInfo
- Publication number
- JPH0729111B2 JPH0729111B2 JP2213644A JP21364490A JPH0729111B2 JP H0729111 B2 JPH0729111 B2 JP H0729111B2 JP 2213644 A JP2213644 A JP 2213644A JP 21364490 A JP21364490 A JP 21364490A JP H0729111 B2 JPH0729111 B2 JP H0729111B2
- Authority
- JP
- Japan
- Prior art keywords
- geothermal water
- silica
- silica scale
- water
- sedimentation
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、シリカスケールの除去方法に関する。TECHNICAL FIELD The present invention relates to a method for removing silica scale.
地熱発電所、温泉用設備等では、地熱水や温泉水が大量
に使用されている。しかしながら、地熱水等は、多くの
溶存シリカ成分を含有している。シリカスケールは、地
熱発電所等の地熱水利用設備内の配管、装置或いは還元
井等に付着する。このため、地熱水利用設備の運転に支
障を来す問題があった。Geothermal power plants and hot spring facilities use a large amount of geothermal water and hot spring water. However, geothermal water contains many dissolved silica components. Silica scale adheres to pipes, devices, reduction wells, etc. in geothermal water utilization facilities such as geothermal power plants. Therefore, there is a problem that the operation of the geothermal water utilization facility is hindered.
そこで、従来、地熱水中のシリカ成分を、第５図に示す
ような除去装置によって除去していた。すなわち、シリ
カ成分が溶存する高温の地熱水を、地熱水導入配管21か
ら大気中に解放された滞留槽22内に供給する。次いで、
薬剤供給装置24から地熱水中にpH調節剤を供給する。こ
の操作によって、地熱水をアルカリ性にして溶存するシ
リカ成分を過飽和状態にする。この後、滞留槽22内部に
複数の仕切板25により形成した流路26内に、地熱水を滞
留させる。この滞留操作によって、過飽和状態のシリカ
成分が重合して沈降する。このようにして過飽和状態の
シリカを沈降除去した地熱水を、流路26の終点部付近に
設けた処理水流出配管23から流出する。Therefore, conventionally, the silica component in the geothermal water has been removed by a removing device as shown in FIG. That is, high-temperature geothermal water in which the silica component is dissolved is supplied from the geothermal water introduction pipe 21 into the retention tank 22 that is released into the atmosphere. Then
A pH adjuster is supplied from the chemical supply device 24 into geothermal water. By this operation, the geothermal water is made alkaline to dissolve the dissolved silica component into a supersaturated state. Then, the geothermal water is retained in the flow path 26 formed by the plurality of partition plates 25 inside the retention tank 22. By this retention operation, the supersaturated silica component is polymerized and settles. The geothermal water from which the supersaturated silica has been settled and removed in this way flows out from the treated water outflow pipe 23 provided near the end point of the flow path 26.
しかしながら、従来のシリカ成分の除去方法は、大気圧
の雰囲気中で行うため、地熱水の温度は、100℃程度と
なる。更に滞留槽２内で地熱水を一定時間滞留させてシ
リカスケールを析出させ、これを沈降除去している。こ
のため、地熱水の温度が更に低下する。この結果、地熱
水の熱を有効に利用できない問題があった。However, since the conventional method of removing silica components is performed in an atmosphere of atmospheric pressure, the temperature of geothermal water is about 100 ° C. Further, geothermal water is retained in the retention tank 2 for a certain period of time to precipitate silica scale, which is removed by sedimentation. Therefore, the temperature of the geothermal water further decreases. As a result, there is a problem that the heat of the geothermal water cannot be effectively used.
また、従来の方法は、地熱水を一定時間滞留させるた
め、大きな設備を必要とする。しかも、かかる設備を連
続して運転するには、滞留槽22をもう一つ準備しなけれ
ばならない問題があった。Further, the conventional method requires a large facility because geothermal water is retained for a certain period of time. Moreover, there is a problem that another holding tank 22 must be prepared in order to continuously operate such equipment.
本発明は、かかる点に鑑みてなされたものであり、地熱
水の温度を高温に保ちながら、しかも、短時間に連続的
に地熱水の処理を行うことができるシリカスケールの除
去方法を提供するものである。The present invention has been made in view of such a point, while maintaining the temperature of the geothermal water at a high temperature, yet, a silica scale removal method capable of continuously performing geothermal water treatment in a short time. It is provided.
本発明は、シリカ成分を溶存した被処理液のpH値を高
温、飽和圧力雰囲気中で所定値に設定してシリカ成分を
析出させる工程と、前記被処理液から該シリカ成分を高
温、飽和圧力雰囲気中で沈降分離する工程とを具備する
ことを特徴とするシリカスケールの除去方法である。The present invention is a step of precipitating the silica component by setting the pH value of the liquid to be treated in which the silica component is dissolved at a high temperature and a predetermined pressure in a saturated pressure atmosphere, and the high temperature and the saturation pressure of the silica component from the liquid to be treated. And a step of performing sedimentation separation in an atmosphere, which is a method for removing silica scale.
本発明のシリカスケールの除去方法によれば、高温、飽
和圧力雰囲気中で被処理液中のシリカ成分を析出させ、
沈降分離する。これにより、被処理液中のシリカ成分が
過飽和状態になり易くなり、シリカ成分を極めて短時間
に沈降除去できると共に、処理後の被処理液も高温に維
持することができる。According to the method for removing silica scale of the present invention, a silica component in a liquid to be treated is deposited at a high temperature and a saturated pressure atmosphere,
Settle and separate. As a result, the silica component in the liquid to be treated is likely to become supersaturated, the silica component can be settled and removed in an extremely short time, and the liquid to be treated after the treatment can be maintained at a high temperature.
以下、本発明の実施例について、図面を参照して詳細に
説明する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は、この実施例で使用したシリカスケールの除去
装置の構成を示す説明図である。FIG. 1 is an explanatory view showing the structure of the silica scale removing device used in this example.
まず、シリカ成分が溶存した約168℃の地熱水を、導入
管１を介して密閉構造のpH調節槽２内に高圧状態で供給
する。この際の地熱水の高圧は、例えば約6.7kg/cm2ｇ
である。First, geothermal water of about 168 ° C. in which a silica component is dissolved is supplied under high pressure into the pH adjusting tank 2 having a closed structure via the introduction pipe 1. The high pressure of geothermal water at this time is, for example, about 6.7 kg / cm 2 g.
Is.
次に、pH調節槽２内のpH調節剤注入装置４から地熱水中
に所定量のpH調節剤を注入する。次いで、pH調節槽２の
内部に仕切板17を交互に配置して形成した流路18に沿っ
て地熱水を導く。この操作によって、地熱水のpHを、8.
5〜9.0の範囲内に設定する。Next, a predetermined amount of pH adjusting agent is injected into the geothermal water from the pH adjusting agent injection device 4 in the pH adjusting tank 2. Next, the geothermal water is guided along the flow path 18 formed by alternately arranging the partition plates 17 inside the pH adjusting tank 2. By this operation, the pH of the geothermal water is adjusted to 8.
Set within the range of 5 to 9.0.
次に、pHが調節された地熱水を、パイプ９を介して密閉
状態の沈降分離容器５に導く。Next, the pH-controlled geothermal water is introduced into the sedimentation / separation vessel 5 in a closed state via the pipe 9.
ここで、必要に応じて第２図に示す如くパイプ９に、添
加剤注入装置７、攪拌装置８を順次設けて、添加剤注入
装置７から例えば高分子凝集剤、低分子凝集剤等のシリ
カスケールの凝集・沈降を促す添加剤を地熱水に添加す
ると共に、攪拌装置８によってこれを混合するようにし
てもよい。なお、攪拌装置８としては、例えば、地熱水
を利用した自己攪拌方式のスタティックミキサー等を使
用できる。Here, as shown in FIG. 2, if necessary, a pipe 9 is provided with an additive injection device 7 and a stirrer 8 in sequence, and the additive injection device 7 is used to supply silica such as a high-molecular coagulant or a low-molecular coagulant. It is also possible to add an additive that promotes aggregation / sedimentation of the scale to the geothermal water, and mix this with the stirring device 8. As the stirring device 8, for example, a self-stirring type static mixer using geothermal water can be used.
沈降分離容器５内の上部には、逆略漏斗状の集水口11が
設けられている。沈降分離容器５に供給された地熱水
は、第３図に示す如く、集水口11により沈降分離容器５
の底部に向かって流れ、次いで集水口11の広径部からそ
の縮径部に向かって流れるように循環する。この地熱水
の循環操作によって、地熱水中のシリカスケールが析出
し、重合反応を起こし、沈降分離容器５の底部に沈降す
る。An inverted funnel-shaped water collection port 11 is provided in the upper part of the sedimentation / separation container 5. The geothermal water supplied to the sedimentation / separation container 5 is supplied to the sedimentation / separation container 5 through the water collecting port 11 as shown in FIG.
, And then circulates so as to flow from the wide diameter portion of the water collecting port 11 toward the reduced diameter portion thereof. By this circulation operation of the geothermal water, silica scale in the geothermal water precipitates, causes a polymerization reaction, and settles at the bottom of the sedimentation separation vessel 5.
次に、沈降したシリカスケール14を、沈降分離容器５の
底部に設けた排出口10から排出管６を介して排出する。
一方、シリカスケール14が除去された地熱水は、集水口
11の縮径部に接続された出水管３から地熱水利用設備
（図示せず）に導く。この実施例では、地熱水利用設備
に、約161℃の高温状態で地熱水を導けることが確認さ
れた。Next, the precipitated silica scale 14 is discharged from the discharge port 10 provided at the bottom of the sedimentation separation container 5 through the discharge pipe 6.
On the other hand, the geothermal water from which the silica scale 14 has been removed is
The water discharge pipe 3 connected to the reduced diameter portion 11 leads to a geothermal water utilization facility (not shown). In this example, it was confirmed that the geothermal water can be guided to the geothermal water utilization facility at a high temperature of about 161 ° C.
なお、沈降分離容器５に代えて、第４図に示す如く、パ
イプ９の排出側の端部を中央部に位置付けて、その外側
にこれを囲むようにして円筒形の沈降壁12、13を順次配
置した沈降分離容器20を使用しても良い。Instead of the settling / separating vessel 5, as shown in FIG. 4, the discharge side end of the pipe 9 is positioned at the center, and cylindrical settling walls 12 and 13 are sequentially arranged outside the end so as to surround the end. The sedimentation separation container 20 described above may be used.
以上のようにこの実施例では、高温の地熱水からシリカ
成分を連続的に容易に除去することができた。そして、
地熱水利用設備にシリカスケールが付着するのをほぼ完
全に防止することができた。このため、付着スケールの
除去作業等の保守・管理の手間を大幅に削減することが
できた。As described above, in this example, the silica component could be easily and continuously removed from the hot geothermal water. And
It was possible to almost completely prevent silica scale from adhering to the geothermal water utilization facility. For this reason, it has been possible to significantly reduce the time and effort required for maintenance and management such as work for removing adhered scale.
しかも、処理後の地熱水の温度を十分に高温に保つこと
ができた。この結果、地熱水の熱を効率よく利用できる
と共に、地熱水の利用範囲・用途を拡大することができ
た。Moreover, the temperature of the geothermal water after the treatment could be kept sufficiently high. As a result, the heat of the geothermal water can be efficiently used, and the range and uses of the geothermal water can be expanded.
なお、pH調節剤及び添加剤の添加によって、シリカスケ
ールの析出速度及び沈降速度を容易に制御することが可
能である。このため、pH調節槽２及び沈降分離容器５、
20の容量を小さくして、シリカスケール除去設備の占有
空間を小さくすることができる。It is possible to easily control the deposition rate and sedimentation rate of silica scale by adding a pH adjuster and an additive. For this reason, the pH control tank 2 and the sedimentation separation container 5,
The volume of 20 can be reduced to reduce the space occupied by the silica scale removal equipment.
以上説明した如くに、本発明のシリカスケールの除去方
法によれば、地熱水の温度を高温に保ちながら、しか
も、短時間に連続的に地熱水の処理を行うことができる
等顕著な効果を有するものである。As described above, according to the method for removing silica scale of the present invention, it is possible to perform continuous treatment of geothermal water in a short time while keeping the temperature of geothermal water at a high temperature. It has an effect.
第１図は、本発明を適用したシリカスケール除去装置の
一例を示す説明図、第２図は、同シリカスケール除去装
置の他の例を示す説明図、第３図は、本発明の実施例に
て使用する沈降分離容器の一例を示す説明図、第４図
は、同沈降分離容器の他の実施例を示す説明図、第５図
は、シリカスケールの除去装置の従来例を示す説明図で
ある。 １…導入管、２…pH調節槽、３…出水管、４…pH調節剤
供給装置、５、20…沈降分離容器、６…排出管、７…添
加剤注入装置、８…攪拌装置、９…パイプ、10…排出
口、14…シリカスケール。FIG. 1 is an explanatory view showing an example of a silica scale removing apparatus to which the present invention is applied, FIG. 2 is an explanatory view showing another example of the silica scale removing apparatus, and FIG. 3 is an embodiment of the present invention. Fig. 4 is an explanatory view showing an example of the sedimentation separation container used in Fig. 4, Fig. 4 is an explanatory view showing another embodiment of the sedimentation separation container, and Fig. 5 is an explanatory view showing a conventional example of a silica scale removing device. Is. DESCRIPTION OF SYMBOLS 1 ... Introducing pipe, 2 ... pH adjusting tank, 3 ... Water outlet pipe, 4 ... pH adjusting agent supply device, 5, 20 ... Sedimentation and separation container, 6 ... Discharge pipe, 7 ... Additive injection device, 8 ... Stirring device, 9 … Pipe, 10… outlet, 14… silica scale.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 松村 忠彦 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (56)参考文献 特開 平３−61673（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadahiko Matsumura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd. (56) Reference JP-A-3-61673 (JP, A)
Claims (1)
温、飽和圧力雰囲気中で所定値に設定してシリカ成分を
析出させる工程と、前記被処理液から該シリカ成分を高
温、飽和圧力雰囲気中で沈降分離する工程とを具備する
ことを特徴とするシリカスケールの除去方法。1. A step of precipitating a silica component by setting a pH value of a liquid to be treated having a silica component dissolved therein at a high temperature and a predetermined value in a saturated pressure atmosphere, and saturating the silica component from the liquid to be treated at a high temperature. And a step of performing sedimentation separation in a pressure atmosphere, the method for removing silica scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2213644A JPH0729111B2 (en) | 1990-08-14 | 1990-08-14 | Silica scale removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2213644A JPH0729111B2 (en) | 1990-08-14 | 1990-08-14 | Silica scale removal method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04100599A JPH04100599A (en) | 1992-04-02 |
| JPH0729111B2 true JPH0729111B2 (en) | 1995-04-05 |
Family
ID=16642570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2213644A Expired - Lifetime JPH0729111B2 (en) | 1990-08-14 | 1990-08-14 | Silica scale removal method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729111B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5082492A (en) * | 1989-05-01 | 1992-01-21 | Union Oil Company Of California | Recovery of precious metals from aqueous media |
-
1990
- 1990-08-14 JP JP2213644A patent/JPH0729111B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04100599A (en) | 1992-04-02 |
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