成果報告書詳細
管理番号20150000000650
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 地熱発電適用地域拡大のためのハイブリッド熱源高効率発電技術の開発
公開日2015/9/1
報告書年度2014 - 2014
委託先名一般財団法人電力中央研究所 国立大学法人富山大学
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 Technology, Innovative Technology Development for Promotion of Introduction of Geothermal Power Plant, Development of Hybrid Geothermal Power Plant Combined with other thermal energy sources (FY2013-FY2015) FY2014 Annual Report

-Feasibility estimate of hybrid geothermal power plant (hybrid GPP)
We have developed highly efficient hybrid GPP combined with other thermal energy sources, which are biomass, solar thermal energy, or exhaust heat from fuel cells, and so on. It is expected that the thermal efficiencies of these systems are improved by superheating the main steam through the use of the other energy sources. We have looked into the system feasibility of these hybrid GPPs in the light of the engineering, economic performance, environmental laws and regulations. As a result, we found that hybrid GPP combined with biomass has greater feasibility than others.
The schematic system of the external biomass heat source facility for 3,000kW geothermal power plant and the geothermal steam super-heater specification were checked, optimized and last year’s value of power generation cost was revised. It is predicted that power generation cost of wood chips will be 20.5 yen/kWh, and be lowest among some biomass feedstock (forest residues, wood chips, wood pellets).
The total cost of biomass as superheating source for a case plant was estimated based on neighboring forests designated by new thinning scheme. We have found that the annual amount was enough although high cost woods by non-commercial thinning must be used.
The prior-art search that pertains to hybrid GPP combined with biomass was conducted. From an interview with Enel Green Power in Larderello, Italy about the Cornia 2 power plant under construction, we got some useful information and reflected the information to the design of our system.

-Development of fiber optic sensor
The effect of precipitated silica scale on the transmittance response of fiber optic sensor was investigated. In the field study, the simplified version of stream separator and heating unit which was prepared/developed/fabricated last year was used. The change of the fiber transmittance was successfully observed due to precipitation of silica scale on the fiber surface.
--Laboratory test
The effect of different parameters on the fiber sensors transmittance responses were investigated using saturated silica solution. The fiber sensor with 200 μm of core diameter showed higher sensitivity compared to the one of 400 μm core diameter.
--Field test
The field test was performed as an accelerated test using geothermal water and vapor generated from SC-4 hole in Sumikawa geothermal power plant. The fiber optic sensor was used to monitor the transmittance response of the silica scale precipitation caused by the geothermal vapor on the surface core. The fiber was fixed in the heating unit which was equipped with simplified stream separator. A decreased in transmittance at the visible and near infrared region is clearly contributed from the scale formation on the surface of the sensor. This results shows that the scale sensor can be applied in geothermal environmental condition for monitoring silica scale formation.
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