成果報告書詳細
管理番号20140000000478
タイトル*平成25年度中間年報 地熱発電技術研究開発 環境配慮型高機能地熱発電システムの機器開発 地熱複合サイクル発電システムの開発
公開日2014/7/5
報告書年度2013 - 2013
委託先名株式会社東芝
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: Development of a geothermal combined cycle power generation system Interval Report for 2013 Fiscal Year (Out of 2013 FY - 2014 FY Program) By : Toshiba Corporation

Contents and Results
(1) Optimization of a combined cycle
The heat balance of a combined cycle, which consists of a steam/water separator, a steam turbine driven by flash steam and a binary cycle powered by hot water was calculated. The cycle efficiencies with existing and candidate working fluid were investigated considering the performance and operation characteristics of the constituent equipment.
(2)Selection of a low-boiling working fluid
The performance of a combined cycle system significantly depends on the proper selection of working fluid for the binary cycle. To improve the performance of the system, the selection of a working fluid suitable for the combined cycle system was studied.
(3) Development and design of a turbine for binary cycle
The flow path calculation of a turbine for binary cycle and the study of the performance were carried out corresponding to the heat balance and the working fluid described above. The turbine was assumed to be multi-stage, axial and single flow. The effect of the number of the stages, the rotation speed and the output power was studied.
(4)Development and design of heat exchangers corresponding to candidate working fluid
The performances of the evaporator and the condenser were calculated considering supposed heat balance and the type of the heat exchangers were studied.
It was assumed that the evaporator is a shell and tube type heat exchanger and the geothermal water flows inside of the tube and the working fluid outside. The velocity in the tube is kept above a certain level to prevent impurities such as silica in the geothermal water from forming scale.
It was assumed that the condenser is also a shell and tube type heat exchanger and the cooling water flows inside of the tube and the working fluid outside. The advantage of an enhancement tube was studied because the thermal resistance of the low-boiling working fluid is large.
(5)Development of technologies to control the formation and growth of scales from geothermal water
The geothermal water qualities of the candidate sites were investigated by literature. The water quality data which were supposed to generate the scales mostly composed of calcium carbonate or silica were extracted.
The reagent addition as one of the methods to control the growth of the scales was studied. In particular, the flocculant to reduce the concentration of the main components of the scale such as silica and calcium carbonate was investigated. The reagents which inactivate the minor components to cause the scale deposition were also investigated.
(6)Study of the site to contribute the verification test
The selection of the candidate site which well condition complies with the combined cycle and the preparation of the negotiation and the procedure were promoted.
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