Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 136, Issue -, Pages 36-43Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2016.12.065
Keywords
Hydrogen; Si engines; n-Butanol; Emissions; Lean combustion
Categories
Funding
- National Key Basic Research Development Project (973) [2013CB228403]
- National Natural Science Foundation [51476002]
- Sci & Tech Project of Beijing Municipal Commission of Education [KM201510005011]
- Key Program of Sci & Tech Project of Beijing Municipal Commission of Education [KZ201610005005]
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n-Butanol is a feasible fuel candidate for spark-ignition engines. The current paper carried out an experiment to explore effects of hydrogen addition on further improving the performance of a n-butanol engine under the part load and lean conditions. Within the test, the engine intake pressure and speed were respectively kept at 61.5 kPa and 1400 rpm. The volumetric fractions of hydrogen in the total intake gas (hydrogen + air) were constrained at 0 and 3%, respectively. Under a certain hydrogen blending level, the global excess air ratio of in-cylinder charge which was changed from the stoichiometric to near the lean burn limit was adjusted by varying the n-butanol injection duration. The experimental results confirmed that the brake thermal efficiency was heightened and the lean burn limit was extended after the hydrogen addition. Besides, compared with the pure n-butanol combustion, the hydrogen enrichment enables the engine to gain dropped ignition delay and rapid combustion duration. Moreover, CO and HC from the pure n-butanol engine were reduced by the hydrogen addition. NOx were generally reduced when the excess air ratio was raised. This suggested that NOx from the hydrogen-enriched butanol engine could also be controlled by lean combustion. (C) 2016 Elsevier Ltd. All rights reserved.
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