Çift yakıtlı bir dizel motorda LPG yüzdesinin performans ve egzoz emisyonlarına etkisi

Bu çalışmada, tek silindirli, direkt püskürtmeli bir dizel motorda ikinci yakıt olarak %30 propan, %70 bütandan oluşan LPG’nin (Liquefied Petroleum Gas) dizel/LPG çift yakıtı içerisindeki oranının performans ve egzoz emisyonlarına etkisi araştırılmıştır. Testler, maksimum tork devrinde (2600 d/d), maksimum torkun %20, %40, %60, %80 ve %100’ünde olmak üzere değişen yüklerde saf dizel yakıtı ve kütlesel olarak %20, %40, %60, %80 ve %90 LPG içeren çift yakıt ile gerçekleştirilmiştir. Test sonuçları, her orandaki çift yakıt ile is ve azot oksit (NOx) emisyonlarının azaldığını, karbonmonoksit (CO) ve hidrokarbon (HC) emisyonlarının ise arttığını göstermiştir. Ayrıca, fren Özgül Yakıt Tüketiminin (ÖYT) %40 LPG ile yüke bağlı olarak dizel yakıtına göre %3,5-15 oranında azaldığı ve egzoz gaz sıcaklığının da genel olarak dizel yakıtından düşük çıktığı görülmüştür. LPG’nin yakıt olarak kullanılması sonucu tek olumsuz etki olarak ortaya çıkan bir miktar CO ve HC emisyon artışı herhangi bir yöntemle düşürülebildiği takdirde, dizel yakıtı ile birlikte %40-%60 oranında LPG’nin yakıt olarak kullanılabileceği tespit edilmiştir.

Effects of LPG percentage to performance and exhaust emissions in a dual fuel engine

In this study, an experimental investigation was presented to determine the effects of various ratios of Liquefied Petroleum Gas (LPG), containing 30% propane and 70% butane, on the performance and exhaust emission in a dual fuel engine with direct injection. The tests were performed at maximum torque speed of 2600 rpm with a various loads of maximum torque (20%, 40%, 60%, 80% and 100%) by using pure diesel fuel or dual fuel containing 20%, 40%, 60%, 80% and 90% of LPG. The test results showed that the smoke and Nitrogen oxide (NOx) emissions decrease, while carbon monoxide (CO) and hydrocarbon (HC) emissions increase at all mixtures of LPG and diesel fuel. Brake specific fuel consumption (bsfc) decreases by 3.5-15% with 40% LPG while the load increases. Exhaust gas temperatures at the mixture fuel were lower than that of diesel fuel in general. It was concluded that LPG can be used with diesel fuel as a mixture up to 40-60% of LPG, provided that CO and HC emissions can be lowered.

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