著者

小林 秀昭 早川 晃弘

出版者

一般社団法人 日本燃焼学会

雑誌

日本燃焼学会誌 (ISSN:13471864)

巻号頁・発行日

vol.61, no.198, pp.277-282, 2019 (Released:2019-11-15)

参考文献数

33

被引用文献数

1

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The Cross-ministerial Strategic Innovation Promotion Program (SIP) “Energy Carriers”, which aims development of hydrogen value chain, was conducted for five years from 2014. Research and development of ammonia combustion played an important role in the project, and significant outcomes related to utilization of ammonia as a carbon-free fuel were produced for gas turbines, internal combustion engines, industrial furnaces, co-firing of pulverized coal combustion, as well as feasibility study of ammonia combustion in large scale power plants. The project introduced renewed interest of ammonia combustion into international combustion community in terms of reducing greenhouse-gas emission from combustion in energy and industrial sectors. Ammonia combustion also has an impact not only on Japanese domestic policy for energy and environment but also on international energy agencies, which influence governments and industries of various nations.

著者

小林 秀昭 早川 晃弘

出版者

一般社団法人 日本燃焼学会

雑誌

日本燃焼学会誌 (ISSN:13471864)

巻号頁・発行日

vol.58, no.183, pp.41-48, 2016 (Released:2018-01-26)

参考文献数

27

被引用文献数

6

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Recent advances in the research and development of ammonia combustion are introduced. They are mainly promoted by the Cross-ministerial Strategic Innovation Promotion Program (SIP), “Energy Carrier”. Ammonia is a potential chemical substance not only for a hydrogen energy carrier but also a carbon free fuel. Ammonia also has advantages in terms of storage and transportation because the thermal properties are almost the same as those of propane. The subjects of ammonia combustion research are on low combustion intensity, low radiation intensity, as well as high NOx emission. In this article, recently obtained fundamental ammonia flame characteristics, such as the features of NO formation, laminar burning velocity, Markstein length and reaction enhancement by hydrogen addition are summarized. Flame structures and burnt gas characteristics were experimentally and numerically evaluated. NO mole fraction decreased with an increase in equivalence ratio and it is caused by NHi (i = 2, 1, 0) generated from excess NH3 in the mixture. Laminar burning velocities and Markstein lengths were evaluated from spherically propagating flames up to 0.5 MPa. The maximum value of laminar burning velocity of ammonia/air is less than 7 cm/s and is about 1/5 of that of methane/air flame. 1D flame simulation with detailed reaction mechanisms were also performed and it was showed that the quantitatively predicted laminar burning velocities were inaccurate. The laminar burning velocity exponentially increases with the increase in the hydrogen ratio. On the other hand, the Markstein length varies non-monotonically with with an increase in the hydrogen ratio.