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Effect of hydrogen addition to intake gas on combustion and exhaust emission characteristics of a diesel engine

2011; Elsevier BV; Volume: 36; Issue: 20 Linguagem: Inglês

10.1016/j.ijhydene.2011.06.144

1879-3487

Toru Miyamoto, Hirokazu Hasegawa, Masato Mikami, Naoya Kojima, Hajime Kabashima, Yasuhiro Urata,

Biodiesel Production and Applications

The present study experimentally investigated the performance and emission characteristics of the diesel engine with hydrogen added to the intake air at late diesel-fuel injection timings. The diesel-fuel injection timing and the hydrogen fraction in the intake mixture were varied while the available heat produced by diesel-fuel and hydrogen per second of diesel fuel and hydrogen was kept constant at a certain value. NO showed minimum at specific hydrogen fraction. The maximum rate of incylinder pressure rise also showed minimum at 10 vol. % hydrogen fraction. However, it is desirable to set the maximum rate of incylinder pressure rise less than 0.5 MPa/deg. to realize low level of combustion noise and NO emission. We attempt to reduce further NO and smoke emissions by EGR. As the result, in the case of the diesel-fuel injection timing of −2 °. ATDC with 3.9 vol. % hydrogen addition, the smoke emission value was 0%, NO emission was low, the cyclic variation was low, and the maximum rate of incylinder pressure rise was acceptable under a nearly stoichiometric condition without sacrificing indicated thermal efficiency.