成果報告書詳細
管理番号20150000000695
タイトル*平成26年度中間年報 地熱発電技術研究開発 低温域の地熱資源有効活用のための小型バイナリー発電システムの開発 炭酸カルシウムスケール付着を抑制する鋼の表面改質技術の開発
公開日2015/9/1
報告書年度2014 - 2014
委託先名国立大学法人東京海洋大学 株式会社エディット 国立大学法人横浜国立大学 国立大学法人長崎大学
プロジェクト番号P13009
部署名新エネルギー部
和文要約
英文要約Title: Research and development on geothermal power / Development of compact binary-cycle power generation system using hydrothermal water as a geothermal resource / Surface modification of steels to suppress calcium carbonate scale adhesion on the surface (FY2013-2015) FY2014 Annual Report

We have investigated the surface modification of steels to suppress calcium carbonate scale adhesion on the surface under the hydrothermal water flow condition, and the influence of the scale adhesion on the heat transfer in the steels has been evaluated. In FY 2014, we have successfully developed the modified steel and evaluated its superior performance in the laboratory, and have proceeded field-tests at Obama hot spring area.

1. Field-test for scale adhesion on the inner wall of steel pipe
We have set the test pipes near the tank for a hot spring source at Obama, Unzen-shi, Nagasaki. Conventional Carbon steel pipes were firstly installed into the field-test site. The scale adhesion on the surface was confirmed. Secondary, stainless steel pipes were installed. The scale adhesion behavior was changed so that we keep the testing and have been monitoring the condition of the tank to identify the difference.

2. Analysis of the scale adhesion and growth mechanism
We analyzed the scale on both the pipes and the heat transfer plate which were scrapped at the binary cycle power plant. The primary component was calcium carbonate on the pipe and silicate scale on the heat transfer plate, respectively. Such behavior was similarly detected at other three hot spring sources in Obama hot spring.

3. Mechanism of scale adhesion on the developed material
 The model of scale adhesion was proposed for the suppression in the developed material.

4. Better performance for the developed material
 The scale adhesion for the developed material has been evaluated in laboratory. The developed material showed much superior resistance against scale adhesion.

5. Influence of physical factor of hydrothermal water on the amount of scale 
 We analyzed the physical factor of hydrothermal water on scale adhesion, and its effect on the heat transfer was evaluated.

6. Committee for project
Our plan of field-test was advised through the discussion with professional members.
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