Exergy recuperation of mid and low quality heat by chemical reactions

Takao Nakagaki, Takayuki Ozeki, Yuuta Watanabe

研究成果: Conference contribution

抄録

Conventional thermal power generation, as typified by gas turbines, has steadily increased power generation efficiency by elevating temperature of heat, but there is a limit to the maximum availability of electric energy. Exergy rate is a unified index indicating the quality of energy in deferent forms. We have no way in thermal conversion to extract all of the availability, while almost hydrocarbon fuels have exergy rate around 95%. 25% of exergy is inevitably lost through the combustion process from chemical to heat at maximum temperature of 2000°C. Hydrogen's low exergy rate provides "exergy recuperation" in which degrading 12% from 95% to 83% can take low quality heat up to availability of 83% as a kind of chemical heat pump. Chemically Recuperated Gas Turbine (CRGT) is a specific example, and dimethyl ether (DME) is one of the most suitable fuels because steam reforming occurs around 300°C. Electrochemical partial oxidation (EPOx) is another way to convert mid-quality heat into electric energy as much as difference between change in Gibbs free energy and change in enthalpy. This paper reports concept and industrially-feasible applications of this unconventional and non-cascadic use of heat.

本文言語English
ホスト出版物のタイトルASME 2011 5th International Conference on Energy Sustainability, ES 2011
ページ2017-2023
ページ数7
PARTS A, B, AND C
DOI
出版ステータスPublished - 2011
イベントASME 2011 5th International Conference on Energy Sustainability, ES 2011 - Washington, DC, United States
継続期間: 2011 8 72011 8 10

出版物シリーズ

名前ASME 2011 5th International Conference on Energy Sustainability, ES 2011
番号PARTS A, B, AND C

Conference

ConferenceASME 2011 5th International Conference on Energy Sustainability, ES 2011
国/地域United States
CityWashington, DC
Period11/8/711/8/10

ASJC Scopus subject areas

  • エネルギー工学および電力技術
  • 再生可能エネルギー、持続可能性、環境

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