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成果報告書詳細
管理番号20170000000829
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 事業採算性と環境保全を考慮したバイナリー発電システムに供するタービン発電機の開発設計
公開日2018/6/2
報告書年度2016 - 2016
委託先名丸和電機株式会社
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 :
Design development of turbine generator for binary geothermal power generation system with business profitability and environmental conservation (FY2015 - FY2017) FY2016 Annual Report

The summary of design development for turbine generator proceeding in accordance with implementation planning of joint development is shown in the following. The details of turbine generator for binary geothermal power generation with working fluid of Hydro Fluoro Olefin (hereinafter HFO) which is small Global Warming Potential are designed as condition of low temperature geothermal brine relatively, besides Active Magnet Bearing (hereinafter AMB) designed in the development is oil free which is beneficial to environmental issues and intended for maintenance free. The fixed design target of turbine generator which is capable of achieving to output power of 50-250kW are supposed to be applied for binary geothermal power generations.
The goals as follows for the development are accomplished in out year.
1.System thermal efficiency of 7% or more is achieved. The design target of turbine is fixed from the optimal conditions of evaporation and condensation temperatures in the system.
2.The adiabatic efficiency for turbine is determined to achieve the above efficiency.
3.The generator efficiency is determined as well as turbine efficiency.
4.The maximum power is 250kW. The design method for evaluating output power between 50kW and 250kW is considerable.
5.The target efficiency per each main component in the system is determined to achieve the system thermal efficiency.
Prospective working fluid: HFO (low-boiling working fluid)
The geothermal generation system and turbine specification have been studied in the previous fiscal year. The prediction of the target adiabatic efficiency and preliminary rotor design have been worked out in this fiscal year.
1)Prediction of the target adiabatic efficiency
Overall efficiency has been calculated from turbine adiabatic efficiency, motor efficiency and inverter efficiency. 0.88 of Turbine adiabatic efficiency has been predicted from Ns-Ds diagram (Ns: Non-dimensional specific speed Ds: Non-dimensional diameter).
2) Generator design
The generator consists of turbine rotor, shaft with generator rotor supported by AMB and stationary parts . Two structural cooling designs have been studied.
3)Rotor design with AMB
No critical speed has been found by rotordynamics for the above two structural designs supported by AMB. It has rotor stabilization.
4)Turbine design
Nozzle expansion and Mach number per each season (summer, middle and winter ) have been studied from reaction degree besides the optimized geometries of rotational blade, nozzle vane and volute have been determined by CFD.
The stage adiabatic efficiency has been finally predicted 90.6% at 7,000rpm , 91.9% at 8,000rpm and 89% at 8,500rpm per each season.
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