成果報告書詳細
管理番号20150000000359
タイトル*平成26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2015/6/16
報告書年度2014 - 2014
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)FY2014 Annual Report

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.

2. Result of the year 2015
Feasible heat source condition: Flow rate 160L/min, Temperature above 85℃.
Detail study is done at the 3 sites other than the site at Atami Kino Miya Hot spring well.

Flush tank development for scale removal:
Evaporate steam out of hot spring water at 100℃ and condense the steam at 85℃ at the heat exchanger. Design and manufacture the Vertical Cylindrical flush tank. Water droplet should be separated by the gravity force inside the flush tank. Large amount of water droplet diameter is distributed around 500μ diameter. This majority of large water droplet can be separated by gravity force when steam flow velocity is lower than 1m/sec. The remaining hot water can be drained through the bottom of the flush tank by the gravity when level of hot water is kept above 5.5m above the ground level. The drained hot water is used as hot spring as usual.

High efficient heat exchanger:
Low pressure steam is condensed at 85℃ by exchanging heat by evaporating refrigerant R134a. Compact brazing type plate heat exchanger which has sufficient surface area at overall heat exchange efficiency of 1,400kcal/h・m2・℃ is selected.

Low pressure steam control system development:
Low pressure steam is condensed at the heat exchanger and drained as condensed water at 85℃. The drained water is transferred by the pump to the evaporative condenser.
Inert gas is pumped out of the system by the vacuum pump during operation.

Evaporative condenser development:
Compact plate fin heat exchanger and water cooling element is applied to the evaporative condenser.
Refrigerant Condensing temperature is targeted at plus 3℃ above ambient wet bulb temperature. Refrigerant holding amount is 1/10 of conventional condenser.

3. Progress situation of development
Design and manufacturing of the 4 components started right after the contract. The completed components were delivered to the Keiyo Plant Engineering Ichikawa Development center test plant site located Ichikawa City. After completion of election work, equipment performance is planned to be done in May 2015. The system performance test is planned to commence from June 2015 aiming to achieve 7% system power generation efficiency.

4. Result.
No test result reported as equipment is under construction.
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