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成果報告書詳細
管理番号20190000000707
タイトル*平成30年度中間年報 エネルギーシステムの柔軟性確保に貢献し低炭素化を実現する排熱活用高効率発電システムに関する検討
公開日2019/6/25
報告書年度2018 - 2018
委託先名関西電力株式会社
プロジェクト番号P12004
部署名省エネルギー部
和文要約
英文要約Development Subject: Studies on Waste-Heat-Using High-Efficiency Power Generation Systems That Will Contribute to the Flexibility of Energy Systems and Achieve Low-Carbon Power Generation

(1) Investigation of LAES systems and the like
To study the superiority of LAES in technologies for using cryogenic energy from LNG, an investigation was made into currently commercialized cryogenic energy utilization technologies by referring mainly to cases observed in Japan. The kinds of LNG carburetors and cases of their introduction were investigated to consider technologies for collecting cryogenic energy from LNG.
As an advance investigation of prior LAES examples, the firm Highview Power of the UK was visited to confirm the facility configurations necessary for LAES systems and issues associated with the operation of LAES.
(a) Overview of Highview Power
Highview Power was founded in 2005. Financially assisted by the Department of Energy and Climate Change (the current Department of Business, Energy and Industrial Strategy, BEIS) and the like, the firm operated a pilot plant (350 kW output, 2.5 MWh) from 2011 to 2014. From 2018 on, the firm has been conducting various experiments intended for the commercialization using a demonstration plant.
(b) LAES demonstration plant of Highview Power
The firm’s demonstration plant’s output is 5 MW and 15 MWh, it is situated in the suburbs of Manchester. It was constructed with a subsidy of over US$ 1.1 million from BEIS in 2014. On the 5,000 m2 premises, Viridor, a project partner and a waste service company, has installed a diesel generator using methane gas produced from waste, with the waste heat from the generator incorporated into the system to enhance the system’s efficiency.

(2) Facility configuration
a. Assumption of an LNG thermal power generation system
Regarding an LNG cryogenic energy utilization system composed of LAES and a GT inlet air cooling unit, some types of systems were designed and their total performances, including increased output of the GTCC due to the GT inlet air cooling, were calculated. As a result, the best system as the facility configuration to be studied in the future, was identified among the multiple options. This system, use low-temperature air produced as a result of the heat exchange with NG for GT inlet air cooling.
It is expected from the system that approximately 200% of the electric power supplied to LAES can be extracted as the output (the total of the LAES output and the enhanced output of the GTCC) depending on how the system is operated.

(3) Abstraction of technical challenges
Due to the small temperature difference between the LNG vaporization temperature and the air liquefaction temperature, effective heat exchange is likely to become difficult unless the capacity of the heat exchanger is increased. In anticipation of possible heat exchange between LNG and the air, it is necessary to develop a new-type of high-performance heat exchanger using an intermediary medium.
As a prior example of LAES, Highview Power’s plant is operating without particular troubles, but its air liquefaction process is yet to be demonstrated. For this reason, it is necessary to take all possible safety measures in the air liquefaction process in preparation for troubles in carrying out the demonstration test of this system in the future.
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