Efficiency and raw emission benefits from hydrogen addition to methane in a Prechamber–Equipped engine

The following paper presents thermodynamic and optical investigations of the natural flame and OH radical chemiluminescence of a hydrogen enriched methane combustion compared to natural gas combustion. The engine under investigation is a port-fueled unscavenged prechamber 4.8 L single cylinder large bore engine. The blends under consideration are 2%V, 5%V,10%V, and 40%V of hydrogen expected to be blended within existing natural gas grids in a short and mid-term timeline in order to store green energy from solar and wind. These fuel blends could be used for stabilization of the energy supply by reconverting the renewable fuel CH4/H2 in combined heat and power plants. As expected, admixture of hydrogen extends the ignition limits of the fuel mixture toward lean ranges up to an air-fuel equivalence ratio of almost 2. No negative effect on combustion is observed up to an admixture of 40%V hydrogen. At 40%V hydrogen, abnormal combustion like backfire occurs at an air-fuel equivalence ratio of 1.5. The higher mixtures exhibit increased nitrogen oxide emissions due to higher combustion chamber temperatures, while methane slip and CO emissions are reduced due to more complete combustion. The optical investigation of the natural flame and OH radical chemiluminescence are in good agreement with the thermodynamic results verifying the more intense combustion of the fuel blends by means of the chemiluminescence intensity. Further, lube oil combustion and a continuing luminescence after the thermodynamic end of combustion are observed.

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“…Literature review of HCNG fueled engines, 4,13–41 bars indicate an estimation as no value was indicated in the source.…”

Section: Effects Of Hydrogen Blends On Combustion: a Brief Literature...mentioning

confidence: 99%

Optical and thermodynamic investigations of a methane and hydrogen blend fueled large bore engine

Karmann

Eicheldinger

Prager

et al. 2022

International Journal of Engine Research

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“…In a different research, engine design is improved. One modification made is installing the engine with a pre-chamber [43]. This controls the engine knocking.…”

Section: Fundamentals Of Pre-chamber Combustion Structurementioning

confidence: 99%

Pre-Chamber spark ignition: a reliability analysis of pre-chamber valve functions

Akbar,

Zaki

2023

Pamukkale J Eng Sci

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A pre-chamber ignition allows spark-ignition engines to operate in lean air-fuel settings. It improves fuel efficiency and reduces emissions. In this study, a reliability analysis of a single GE Jenbacher J620 natural gas engine was done. It was operational on continuous load in the power generation sector in Karachi, Pakistan. The bathtub curve of GE J620 pre-chamber gas valve (PCV) was generated. The three-year industrial data comprised PCV failures that occurred between two overhauls. During infant mortality, the curve revealed 7 failures during 1000 hours. This decreased to a failure for the next two cycles of thousand hours each. The mean-time-to-failure (MTTF) of the gas valve at 2500 hours and 4500 hours was calculated. There was a 50% decrease in reliability after 1500 hours. Exponential distribution revealed that the mean time-to-failure (MTTF) was 545.5 hours. This study was the first of its kind in the facility. Previously, much time was lost in breakdown maintenance. Thus, it helped to increase the system's reliability.Ön oda ateşlemesi, kıvılcım ateşlemeli motorların zayıf hava yakıtı ayarlarında çalışmasına izin verir. Yakıt verimliliğini artırır ve emisyonları azaltır. Bu çalışmada tek bir GE Jenbacher J620 doğal gaz motorunun güvenilirlik analizi yapılmıştır. Pakistan, Karaçi'de elektrik üretim sektöründe sürekli yükte çalışıyordu. GE J620 ön oda gaz vanasının (PCV) bir küvet eğrisi oluşturuldu. Üç yıllık endüstriyel veriler, iki revizyon arasında meydana gelen PCV arızalarını içeriyordu. Bebek ölümleri sırasında, eğri 1000 saat boyunca 7 başarısızlık ortaya çıkardı. Bu, her biri bin saatlik sonraki iki döngü için başarısızlığa düştü. Gaz vanasının 2500 saat ve 4500 saatte ortalama arıza süresi (MTTF) hesaplandı. 1500 saat sonra güvenilirlikte %50 azalma oldu. Üstel dağılım, ortalama başarısızlık süresinin (MTTF) 545,5 saat olduğunu ortaya koydu. Bu çalışma, tesiste türünün ilk örneğiydi. Daha önce, arıza bakımında çok zaman kaybedildi. Böylece sistemin güvenilirliğinin artmasına yardımcı oldu.

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“…To control this indicator, other works aim to improve this engine design with different modifications like engines with prechamber [22] or an EePilot approach and a largeesquish piston [23] showing an improvement of the Break Thermal Efficiency and CH 4 emissions. At the same time, other research works showed mathematical methods to optimise the performance of internal combustion engines with new fuel tests [24].…”

Section: Using Apg For Electricity and Heat Generation (Chp-combinedmentioning

confidence: 99%

Research on an internal combustion engine with an injected pre-chamber to operate with low methane number fuels for future gas flaring reduction

Zardoya¹,

Lucena

Bengoetxea

et al. 2022

Energy

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Efficiency and raw emission benefits from hydrogen addition to methane in a Prechamber–Equipped engine

Cited by 34 publications

References 46 publications

Optical and thermodynamic investigations of a methane and hydrogen blend fueled large bore engine

Optical and thermodynamic investigations of a methane and hydrogen blend fueled large bore engine

Pre-Chamber spark ignition: a reliability analysis of pre-chamber valve functions

Research on an internal combustion engine with an injected pre-chamber to operate with low methane number fuels for future gas flaring reduction

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