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成果報告書詳細
管理番号20180000000129
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 還元熱水高度利用化技術開発(熱水中のスケール誘因物質の高機能材料化による還元井の延命・バイナリー発電の事業リスク低減)
公開日2018/6/2
報告書年度2016 - 2016
委託先名地熱技術開発株式会社 公立大学法人北九州市立大学 日揮株式会社
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 Technology/ Innovative Technology Development for Promotion of Introduction of Geothermal Power Plant/ Highly-developed Utilization Technology of Geothermal Brine (Upgrading the Life of Reinjection Wells and Risk Reduction of Binary Cycle by Extraction of High- Functional Materials from Scaling Attractant in Geothermal Brine)

Summary:
In this project, we remove harmful substances such as arsenic from silica contained in geothermal water and recover silica as 'economic silica' with high economic value, and efficiently recover lithium and other rare metals etc. from the filtrate after silica removal. At the same time, it aims to contribute to increase in the amount of electricity generation by binary cycle or double flush steam turbine and extend reinjection well life to delete silica from reinjection brine.
In this fiscal year, as a development of colloidal silica recovery technology, basic principles of colloidal silica recovery process corresponding to the reinjection well site (total reinjection brine 10,000t/d) at the steam field in Kakkonda geothermal area (Shizukuishi Town, Iwate) considering the binary cycle system was designed, and basic design was done to arrange the silica recovery process and binary power generation system(2.9MW) almost in the premises. In addition, a pilot plant was constructed and tested with reinjection brine (Silica 450ppm, 10,000t/d) at the steam field in Kakkonda. In the plant, reinjection brine(100t/d) was concentrated and colloidally grown in three steps using an ultrafiltration process using membrane filters. Based on the prediction results of the polymerization test, the conditions of pH 8.5 and temperature 40 deg.C. were adopted as the test conditions. In the test, a final product (30% colloidal silica) was obtained by carrying out 12 batches of the primary concentration step, of which 10 batches were subjected to secondary condensation and colloidal growth and tertiary concentration by the Ostwald ripening process.
It was confirmed that the residual arsenic content of the final product was equivalent to that of the intermediate market product. Through the demonstration tests, we were able to acquire useful basic materials for the design of actual plant. Almost no silica was deposited on the cooling heat exchanger plate, but antimony deposits were confirmed on the plates of heat exchanger. As a conceptual design of the actual machine, basic information on the geothermal fluid property condition to be processed, the site condition of the supposed target construction site, the utility supply condition etc. are organized and examined as necessary basic information, and based on these basic information, basic equipment configuration and process system configuration of the colloidal silica recovery facility were examined and prepared. Also, to reduce the amount of water (defiltration of process and makeup water of the cooling tower) used in the plant, we examined the possibility of introducing process technology to reuse part of process water by filtration through Reverse Osmosis Membrane.
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