JPH0630787B2 - Method for inhibiting polymerization of silica in geothermal hot water - Google Patents
Method for inhibiting polymerization of silica in geothermal hot waterInfo
- Publication number
- JPH0630787B2 JPH0630787B2 JP13605485A JP13605485A JPH0630787B2 JP H0630787 B2 JPH0630787 B2 JP H0630787B2 JP 13605485 A JP13605485 A JP 13605485A JP 13605485 A JP13605485 A JP 13605485A JP H0630787 B2 JPH0630787 B2 JP H0630787B2
- Authority
- JP
- Japan
- Prior art keywords
- silica
- hot water
- geothermal
- polymerization
- inhibiting polymerization
- 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
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims description 46
- 239000000377 silicon dioxide Substances 0.000 title claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 12
- 238000006116 polymerization reaction Methods 0.000 title claims description 9
- 230000002401 inhibitory effect Effects 0.000 title description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 8
- 229920001223 polyethylene glycol Polymers 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910052816 inorganic phosphate Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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方法に関する。TECHNICAL FIELD The present invention relates to a method for suppressing 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 of 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 allowing silica to polymerize to a certain particle size, or a method of retaining 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方法を提供しよう
とするものである。(Problems to be Solved by the Invention) In the present invention, a small amount of a chemical that is inexpensive, has no toxicity and corrosivity, and does not pose a problem in terms of pollution is added to geothermal hot water to polymerize and grow silica. An object of the present invention is to provide a method for suppressing the polymerization of silica in geothermal hot water that 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ポリエチレングリコー
ルを添加することを特徴とする地熱熱水中シリカの重合
抑制方法である。(Means for Solving Problems) That is, the present invention is a method for suppressing polymerization of silica in geothermal water characterized by adding polyethylene glycol to geothermal water.
ポリエチレングリコール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、ポリエチレング
リコ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 polyethylene glycol acts on silica. However, the presence of a certain amount of polyethylene glycol suppresses the polymerization and growth of silica, holds silica in a supersaturated state, and consequently suppresses the generation of scale.
ポリエチレングリコ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１０〜１０
００ppmの添加範囲で使用し、５０〜５００ppmの添加が
効果的である。The amount of polyethylene glycol added to hot water differs depending on the silica concentration in the hot water, but is usually 10 to 10
It is used in an addition range of 00 ppm, and addition of 50 to 500 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、予めポリエ
チレングリコールを表１の濃度になるよう添加してお
く。熱水を採取して直ちに８０℃の恒温水槽に瓶を入
れ、１時間と３時間後にシリカ濃度（溶解シリカ）を計
測した。Polyethylene glycol was added in advance to the bottle of polyethylene for collecting the hot water so that the concentration would be as shown in Table 1. Immediately after collecting hot water, the bottle was placed in a constant temperature water bath at 80 ° C., and the silica concentration (dissolved silica) was measured after 1 hour and 3 hours.
計測値を表１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、ポリエチレングリコール添加のものは、当初濃度
から極めて緩慢に低下することを示した。これは、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。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ポリエチレングリコール
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 blank test together with the temperature drop showed that the concentration of dissolved silica decreased rapidly, but that of polyethylene glycol addition showed a very slow decrease from the initial concentration. This shows that the polymerization of silica is significantly suppressed. The formation of silica scale is said to proceed mainly due to the silica in the polymerization process, which has a strong adhesive force. For example, polyethylene glycol having such a polymerization terminating or inhibiting effect can be used, for example, in the heat exchanger inlet, hot water transport pipe, reduction It is possible to eliminate and reduce various obstacles caused by silica precipitation without adding special equipment and equipment, just by adding it to the wellhead, etc. The economic advantages are great.
Claims (1)
加することを特徴とする地熱熱水中シリカの重合抑制方
法1. A method for suppressing the polymerization of silica in geothermal water, which comprises adding polyethylene glycol to the geothermal water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13605485A JPH0630787B2 (en) | 1985-06-24 | 1985-06-24 | Method for inhibiting polymerization of silica in geothermal hot water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13605485A JPH0630787B2 (en) | 1985-06-24 | 1985-06-24 | Method for inhibiting polymerization of silica in geothermal hot water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61293598A JPS61293598A (en) | 1986-12-24 |
| JPH0630787B2 true JPH0630787B2 (en) | 1994-04-27 |
Family
ID=15166102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13605485A Expired - Lifetime JPH0630787B2 (en) | 1985-06-24 | 1985-06-24 | Method for inhibiting polymerization of silica in geothermal hot water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0630787B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9221700B2 (en) | 2010-12-22 | 2015-12-29 | Ecolab Usa Inc. | Method for inhibiting the formation and deposition of silica scale in aqueous systems |
| JP5946363B2 (en) * | 2012-08-10 | 2016-07-06 | 伯東株式会社 | Silica scale prevention method and scale inhibitor in water system, and water treatment method and water treatment agent that suppress silica scale and suppress metal corrosion |
-
1985
- 1985-06-24 JP JP13605485A patent/JPH0630787B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61293598A (en) | 1986-12-24 |
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