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

Year 2023, Volume: 29 Issue: 5, 418 - 425, 31.10.2023

Faraz Akbar , Sarah Zaki

Abstract

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.

Keywords

Bathtub curve, Exponential distribution, Fuel injection, Pre-Chamber valve, Reliability

Hazne öncesi kıvılcım ateşlemesi: ön yanma odalı valf fonksiyonlarının güvenilirlik analizi

Abstract

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.

Keywords

Küvet eğrisi, Üstel dağılım, Yakıt enjeksiyonu, Ön hazne valfi, Güvenilirlik

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