JPH0630788B2 - A method for suppressing the polymerization of silica in geothermal hot water. - Google Patents
A method for suppressing the polymerization of silica in geothermal hot water.Info
- Publication number
- JPH0630788B2 JPH0630788B2 JP13605385A JP13605385A JPH0630788B2 JP H0630788 B2 JPH0630788 B2 JP H0630788B2 JP 13605385 A JP13605385 A JP 13605385A JP 13605385 A JP13605385 A JP 13605385A JP H0630788 B2 JPH0630788 B2 JP H0630788B2
- Authority
- JP
- Japan
- Prior art keywords
- silica
- hot water
- polymerization
- suppressing
- geothermal
- 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
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は地熱熱水中のシリカの重合抑制法に関する。TECHNICAL FIELD The present invention relates to a method for suppressing the polymerization of silica in geothermal hot water.
（従来の技術） エネルギー資源の活用、経済性、公害性の面から地熱発
電は益々注目され、世界的にも地熱発電所の建設が増大
している。(Prior Art) Geothermal power generation is receiving more and more attention from the viewpoints of utilization of energy resources, economy and pollution, and the construction of geothermal power plants is increasing worldwide.
地熱発電は、地下深部から噴出する高温の蒸気、熱水を
利用するものであるが、これには多量のシリカが溶解し
ており、経時的な温度降下にともなつて重合成長して不
溶性となり熱水径路にスケールとして析出し熱交換器の
熱効率の低下、流路の閉塞とくに還元井の容量減衰等、
地熱開発の上から大きな問題となつている。Geothermal power generation uses high-temperature steam and hot water ejected from deep underground, but a large amount of silica is dissolved in this, and as the temperature drops over time, it grows polymerized and becomes insoluble. Deposition as a scale in the hot water path reduces the heat efficiency of the heat exchanger, blocks the flow path, especially reduces the capacity of the reduction well, etc.
This is a big problem from the viewpoint of geothermal development.
このような障害を排除する方法として、熱水のpHを酸ま
たはアルカリ側におく方法、熱水を滞留槽へ導入させて
シリカが一定粒径まで重合する時間滞留さる方法、ある
いはアルミニウム、鉄等を添加してシリカを凝集沈でん
させる方法、また、各種界面活性剤、水溶性モノマー、
ポリマー、有機・無機のりん酸塩、キレート剤等々を添
加してスケール生成の防止を計るなど多くの提案がある
が、滞留槽法以外は試験段階で実用化に至つておらず、
経済性のある実用的な方法の開発が期待されている。As a method for eliminating such obstacles, a method of setting the pH of hot water to an acid or alkali side, a method of introducing hot water into a retention tank and retaining silica for a time to polymerize silica to a certain particle size, or aluminum, iron, etc. Method of adding silica to coagulate and precipitate silica, various surfactants, water-soluble monomers,
There are many proposals such as adding polymers, organic / inorganic phosphates, chelating agents, etc. to prevent scale formation, but other than the retention tank method, it has not been put to practical use at the test stage,
Development of economical and practical methods is expected.
（発明が解決しようとする問題点） 本発明は、安価に入手でき、かつ毒性、腐食性がなく公
害上も問題にならない少量の薬剤を、地熱熱水中に添加
して、シリカの重合成長を停止あるいは抑制することが
できる地熱熱水中のシリカの重合抑制法を提供しようと
するものである。(Problems to be Solved by the Invention) The present invention provides a polymerization growth of silica by adding a small amount of a chemical that is inexpensive, does not cause toxicity, corrosiveness, and poses no problem in terms of pollution to geothermal hot water. It is intended to provide a method for suppressing the polymerization of silica in geothermal water, which can stop or suppress the above.
（問題点を解決するための手段） すなわち、本発明は地熱熱水中にグリオキサール(C2H2O
2)を添加することを特徴とする地熱熱水中シリカの重合
抑制法である。(Means for Solving Problems) That is, the present invention relates to glyoxal (C 2 H 2 O) in geothermal hot water.
2 ) Addition of 2 ) is a method for inhibiting polymerization of silica in geothermal hot water.
グリオキサール(OHCCHO)がシリカにどのように作用する
かは必ずしも明らかではない。しかし、グリオキサール
が一定量存在することによつてシリカの重合成長を抑制
し、過飽和の状態でシリカが保持され、結果的にスケー
ルの生成が抑制されるものである。It is not always clear how glyoxal (OHCCHO) acts on silica. However, the presence of a certain amount of glyoxal suppresses the polymerization and growth of silica, holds silica in a supersaturated state, and consequently suppresses the formation of scale.
グリオキサールの熱水に対する添加量は、熱水中のシリ
カ濃度に関係して相違するが、通常１〜１０００ppmの
添加範囲で使用し、１０〜３００ppmの添加が効果的で
ある。The addition amount of glyoxal to hot water differs depending on the silica concentration in the hot water, but it is usually used in an addition range of 1 to 1000 ppm, and addition of 10 to 300 ppm is effective.
（実施例） 某地熱発電所の生産井から導かれた熱水は、温度９５
℃、シリカ濃度８００ppm（すべて溶解シリカ）を有す
る。(Example) Hot water introduced from a production well of a geothermal power plant has a temperature of 95%.
It has a silica concentration of 800 ppm (all dissolved silica).
この熱水を採取するポリエチレン１瓶に、予めグリオ
キサールを第１表の濃度になるよう添加しておく。熱水
を採取して直ちに６０℃の恒温水槽に瓶を入れ、１時
間、１時間後にシリカ濃度（溶解シリカ）を計測した。Glyoxal was added to one bottle of polyethylene from which hot water was collected so as to have the concentration shown in Table 1. Immediately after collecting hot water, the bottle was placed in a constant temperature water bath at 60 ° C., and the silica concentration (dissolved silica) was measured after 1 hour and 1 hour.
計測値を第１表に示した。The measured values are shown in Table 1.
温度降下ととも空試験は急速に溶解シリカ濃度が低下し
たが、グリオキサール添加のものは当初濃度を保持する
か、緩慢な低下にすぎず、シリカの重合が顕著に抑制さ
れていることを示している。The blank test rapidly decreased the dissolved silica concentration along with the temperature drop, but the glyoxal added one maintained the initial concentration or was only a slow decrease, showing that the polymerization of silica was significantly suppressed. There is.
シリカスケールの生成は、主として付着力の強い重合過
程のシリカによつて進行するとされており、このような
重合停止あるいは抑止作用をもつグリオキサールを例え
ば、熱交換器入口、熱水輸送管、還元井坑口などに添加
するだけで特別な設備、装置を要せずシリカ析出による
種々の障害を排除、低減することが可能となるので、施
設、装置を大いに必要とする従来法に比較すれば経済的
利点は大きい。The formation of silica scale is said to proceed mainly by silica in the polymerization process, which has a strong adhesive force. It is possible to eliminate and reduce various obstacles due to silica precipitation without adding special equipment and equipment just by adding it to the wellhead, etc., so it is more economical than conventional methods that require much equipment and equipment. The advantages are great.
Claims (1)
とを特徴とする地熱熱水中シリカの重合抑制法。1. A method for inhibiting polymerization of silica in geothermal hot water, which comprises adding glyoxal to the geothermal hot water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13605385A JPH0630788B2 (en) | 1985-06-24 | 1985-06-24 | A method for suppressing the polymerization of silica in geothermal hot water. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13605385A JPH0630788B2 (en) | 1985-06-24 | 1985-06-24 | A method for suppressing the polymerization of silica in geothermal hot water. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61293597A JPS61293597A (en) | 1986-12-24 |
| JPH0630788B2 true JPH0630788B2 (en) | 1994-04-27 |
Family
ID=15166079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13605385A Expired - Lifetime JPH0630788B2 (en) | 1985-06-24 | 1985-06-24 | A method for suppressing the polymerization of silica in geothermal hot water. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0630788B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3401179B2 (en) * | 1998-02-27 | 2003-04-28 | 三菱マテリアル株式会社 | Silica-containing geothermal hydrothermal treatment method |
-
1985
- 1985-06-24 JP JP13605385A patent/JPH0630788B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61293597A (en) | 1986-12-24 |
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