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成果報告書詳細
管理番号20170000000066
タイトル*平成27年度中間年報 地熱発電技術研究開発 低温域の地熱資源有効活用のための小型バイナリー発電システムの開発 スケール対策を施した高効率温泉熱バイナリー発電システムの研究開発
公開日2017/6/15
報告書年度2015 - 2015
委託先名京葉プラントエンジニアリング株式会社
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: Geothermal power generation technology development/ Small size binary power generation system for Low temperature geothermal resource effective utilization/ Technology development for high efficiency binary power generation system with measurement of scale
(FY2014-FY2016)FY2015 Annual Report

Contractor Name: Keiyo Plant Engineering Co. Ltd.

1. Contents of technology development and result.
Recent years, application of binary power generation system using low evaporating temperature refrigerant is increasing. Hot spring energy is widely spread in Japan as low temperature geothermal heat resource. Object of this project is technology development widening opportunity to apply the binary power generation by hot spring as decentralized local electric energy source.
We’ve developed the following power generation system examination facilities at Keiyo Plant Engineering Ichikawa Development center.

2. Flush tank development for scale removal
Water at 99 degrees C from tap water is supplied in a water tank as heat source water from a heat source boiler and supply heat source water to the flush tank from the water tank. Evaporated steam out of the heat source water generated in the flash tank is supplied to the heat exchanger, high efficiency steam-refrigerant heat exchanger, and the remaining heat source water returns to the warm tank with a drop.
We’ve evaluated the scale removal performance of the flush tank, whether scale ingredients accompany the evaporated steam as a mist when the steam generated by the flush tank from hot spring water enter in the heat exchanger, using an experiment hot spring water dissolved the concentration of sodium ion and chloride ion similar to the chloride quality of Atami hot spring.
We measured the electric conductivity of the steam condensation water out from the heat exchanger, the experiment hot spring water, and the returned water from the flush tank. The electric conductivity of the steam condensation water showed the smaller value than the 3 kinds of water mentioned above and also the original heat source water from the boiler.
As a result of the electric conductivity examination, the steam generated by the flush tank dose not accompany the scale ingredient as a mist, We’ve concluded that the removal performance of the flush tank is good as designed.

3. High efficient heat exchanger:
We selected a foreign company B’s heat exchanger that has larger heat transfer coefficient compared than that of a domestic company A’s exchanger, and included it in a heat exchanger unit.
We’ve confirmed the operating conditions of the heat exchanger unit and measured the steam temperature of the heat exchanger entrance, the exit temperature of the heat exchanger, the evaporation temperature of the generator medium, and the supply temperature of the generator medium.
The difference, ΔT, with the steam temperature of the heat exchanger entrance and the evaporation temperature of the generator medium was 4.4 degrees C.
ΔT is assumed 4.3 degrees C with our design specifications of the heat exchanger and We’ve concluded the heat exchanger showed the good performance that we designed.

4. Low pressure steam control system
We’ve confirmed the starting, driving and stopping operation test of the power generation system examination facilities. We’ve concluded the facilities show the good performance with no problem.
Low pressure steam control system showed the good performance as designed.
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5. Evaporation-type condenser
Based on operation of the binary power generating system, We evaluated the performance of the evaporation-type condenser. As a result of the operation, We had two problems and We’ve improved them.

6. Performance testing of the system
We examined the performance of the our system composed of above-mentioned facilities and We’ve got the following result of the power generating system efficiency 6.36%.
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