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成果報告書詳細
管理番号20170000000828
タイトル*平成28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2018/6/26
報告書年度2016 - 2016
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 FY2016 Annual Report

1.Basic survey on chemical constituents and scales in hot springs
Some new hot springs were selected around Izu district. Then, their chemical constituents and scale composition were analyzed by ICP-AES. The hearing survey started with the initiation of this project was consistently conducted to collect the information about scale prevention measures and their frequencies at which such measures are taken to suppress the scale built-up.
2.Development of an electrolysis scale preventer with ion-exchange membranes
Using the pH data obtained from the experiments in the laboratory in Shizuoka University, long term on-site electrolysis operations for prevention of scale formation were carried out in two distinct hot spring sites, namely, Katase and Simokamo. Two different methods for CaCO3 scale prevention were proposed for utilization of the acid solution generated from the electrolysis system with inon-exchange membranes.
One is the injection method in which the acid solution is injected into the flowing hot spring water, while the other is the recirculation method in which the acid solution of low pH is recirculated to wash out the tube inner surfaces. Both methods are found feasible in views of their high cost performances without affecting the power generation system. Thus, these two methods were tested in parallel using the distinctive two pipe lines.
1)Long term on-site operations with the electrolysis system and its performance evaluation
Both injection and recirculation methods have been tested under the long term on-site operations of scale prevention with the electrolysis system. As for the first evaluation, the two methods were applied on SUS304, zinc-plated steel and titanium tube surfaces. In order to find the minimum amount of the acid solution required to prevent the scale built-up, operations were carried out for one week. In both cases, scale built-up was prevented completely on both SUS304 and titanium surfaces, while the scale of 1mm thickness was formed on the zinc-plated steel surface. The scale on the zinc-plated steel surface, however, never grew any further, keeping the same thickness thereafter.
The fact indicates that the acid solution is quite effective to suppress the scale built-up for all cases. Our ultimate goal, namely, the prevention of scale built-up within a heat exchanger will be verified experimentally soon. After collecting all data from these operations, the system optimization will finally be made along with its cost performance evaluation.
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