JPS61293597A - Method for suppressing polymerization of silica present in geothermal hot water - Google Patents
Method for suppressing polymerization of silica present in geothermal hot waterInfo
- Publication number
- JPS61293597A JPS61293597A JP13605385A JP13605385A JPS61293597A JP S61293597 A JPS61293597 A JP S61293597A JP 13605385 A JP13605385 A JP 13605385A JP 13605385 A JP13605385 A JP 13605385A JP S61293597 A JPS61293597 A JP S61293597A
- Authority
- JP
- Japan
- Prior art keywords
- silica
- hot water
- geothermal hot
- polymerization
- 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.)
- Granted
Links
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
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。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for inhibiting 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 attracting more and more attention in terms of utilization of energy resources, economic efficiency, and pollution prevention, 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って重合成長して不
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っている。Geothermal power generation uses high-temperature steam and hot water that erupts from deep underground, but a large amount of silica is dissolved in this, and as the temperature drops over time, it polymerizes and becomes insoluble and generates heat. It has become a major problem in terms of geothermal development, as it precipitates as scale in the water path, reducing the thermal efficiency of heat exchangers, and blocking the flow path, reducing the capacity of reinjection wells in particular.
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法で
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、滞留槽性以外は試験段階で実用化に至っておらず
、経済性のある実用的な方法の開発が期待されている。Methods to eliminate such obstacles include keeping the pH of hot water on the acidic or alkaline side, introducing hot water into a retention tank and retaining it for a period of time until silica polymerizes to a certain particle size, or using aluminum, iron, etc. There are many ways to prevent scale formation by adding various surfactants, water-soluble monomers, polymers, organic and inorganic phosphates, chelating agents, etc. There are some proposals, but none have been put into practical use at the testing stage except for the retention tank method, and it is hoped that an economical and practical method will be developed.
（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
するものでおる。(Problems to be Solved by the Invention) The present invention aims at the polymerization of silica by adding a small amount of a chemical that is inexpensively available, non-toxic, corrosive, and does not pose a problem in terms of pollution to geothermal hot water. The purpose of the present invention is to provide a method for inhibiting the polymerization of silica in geothermal hot water, which can stop or suppress the polymerization of silica in geothermal hot water.
（問題点を解決するだめの手段）
すなわち、本発明は地熱熱水中にグリオキサール（Ｃｚ
ＨｔＯｔ ）を添加することを特像とする地熱熱水中シ
リカの重合抑制法であ−る。(Another Means to Solve the Problems) That is, the present invention provides glyoxal (Cz
This is a method for inhibiting the polymerization of silica in geothermal hydrothermal water, which features the addition of HtOt).
グリオキサール（０ＨＣＣＨ○）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ってシリカの重合成
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 (0HCCH○) acts on silica. However, the presence of a certain amount of glyoxal suppresses the polymerization growth of silica, maintains the 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１〜１０００ ｐｐ
ｍの添加範囲で使用し、１０〜３００ ｐｐｍの添加が
効果的である０（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Ｂ ｏ ｏ ｐｐｍ （すべて溶解シリカ
）を有する０
この熱水を採取するポリエチレン１を瓶に、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。The amount of glyoxal added to hot water varies depending on the silica concentration in the hot water, but is usually 1 to 1000 pp.
It is effective to add 10 to 300 ppm when used within the range of 10 to 300 ppm (Example) Hot water led from a production well of a certain geothermal power plant has a temperature of 95°C.
, a silica concentration B o o ppm (all dissolved silica) is placed in a bottle containing polyethylene 1 from which the hot water is collected, and glyoxal is added in advance to the concentration shown in Table 1. Immediately after collecting the hot water, the bottle was placed in a thermostatic water bath at 60°C, and the silica concentration (dissolved silica) was measured for 1 hour and 1 hour later.
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。In the blank test, the concentration of dissolved silica decreased rapidly as the temperature decreased, but in the test with glyoxal added, the initial concentration was maintained or only decreased slowly, indicating that silica polymerization 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
程のシリカによって進行するとされておシ、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 be mainly caused by silica during the polymerization process, which has a strong adhesive force, and glyoxal, which has the effect of stopping or inhibiting polymerization, can be used, for example, at the inlet of a heat exchanger, hot water transport pipe, or entrance of a reinjection well. It is possible to eliminate and reduce various problems caused by silica precipitation without the need for special equipment or equipment by simply adding it to silica, etc., so it is economically advantageous compared to conventional methods that require a large amount of equipment and equipment. is big.
Claims (1)
る地熱熱水中シリカの重合抑制法。A method for inhibiting polymerization of silica in geothermal hot water, characterized by adding glyoxal to 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 true JPS61293597A (en) | 1986-12-24 |
| JPH0630788B2 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11244867A (en) * | 1998-02-27 | 1999-09-14 | Mitsubishi Materials Corp | Treatment of silica-containing geothermal hot water |
-
1985
- 1985-06-24 JP JP13605385A patent/JPH0630788B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11244867A (en) * | 1998-02-27 | 1999-09-14 | Mitsubishi Materials Corp | Treatment of silica-containing geothermal hot water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0630788B2 (en) | 1994-04-27 |
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