成果報告書詳細
管理番号20150000000545
タイトル*平成26年度中間年報 地熱発電技術研究開発 地熱発電の導入拡大に資する革新的技術開発 電気分解を応用した地熱発電用スケール除去装置の研究開発
公開日2015/7/17
報告書年度2014 - 2014
委託先名イノベーティブ・デザイン&テクノロジー株式会社 国立大学法人静岡大学
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 of geothermal power generation Innovative research and development for further utilization of geothermal power generation Research and development of electrolysis scale remover for geothermal power plant FY2014 Annual Report

A survey on chemical composition of hot spring water was conducted in several hot spring resort districts, namely, Tohoku District, Okuhida Dstrict and Izu District. Practical measures taken in these districts to remove scales were surveyed in details. It was found that silica scales are most extensive in Tohoku District, whereas calcium carbonate scales are dominant in Izu District.
An electrolysis scale remover without an ion-exchange membrane was developed by Innovative Design Technology Inc. for a preliminary test running. As for a verification test, hot spring water was kept running through a binary power plant system, adding some ionized water generated by a prototype electrolysis system designed by IDT Inc. specifically for removing scales in industrial equipment.
As for a first step to verify this system, a short pipe segment with calcium carbonate scales covering its inner wall was mounted to form a part of the pipeline, leading to the heat exchanger for the adjacent binary power plant system. Ionized hot spring water produced by the electrolysis scale remover was supplied into this pipeline to see how the scales are being removed. As for comparison between with and without supplying ionized water, another pipe segment with calcium carbonate scales was inserted in the pipeline in parallel to the former, without supplying ionized water. After one month of operation at Atagawa hot spring district, the thickness of the adherent scale was reduced by 1 to 2 mm. Scale separation was also observed over the inner wall of the tube. This clearly indicates that the electrolysis scale remover works quite effectively to remove the calcium carbonate scales.
Experiments under various electrical and hydro-dynamical conditions will be conducted in the laboratory in Shizuoka University to investigate the mechanism associated with removal of the scales by the transport of ionized water. Possible ways to suppress precipitation of calcium carbonate and silica scales will be investigated both theoretically and experimentally. Furthermore, chemical composition analysis has been made to identify corrosive oxides in the ionized hot spring water. An electrolysis scale remover with an ion-exchange membrane was developed for laboratory experiments. It will be operated under various conditions to investigate pH and corrosion characteristics and its potential for removing scales.
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