Can HAŞİMOĞLU, İBRAHİM ÖZSERT, Yakup İÇİNGÜR

Biyodizel yakıtlı düsük ısı kayıplı bir dizel motorunun tam yük egzoz emisyon karakteristikleri

Bu çalısmada Düsük Isı Kayıplı (DIK) bir dizel motorda biyodizel yakıtı kullanılmasının egzoz emisyonlarına olan etkisi deneysel olarak incelenmistir. Rafine ayçiçegi yagından transesterifikasyon yöntemi ile biyodizel üretilmistir. Biyodizel, yakıtı asırı doldurmalı direkt püskürtmeli bir dizel motorda, tam yük sartlarında kullanılmıstır. Daha sonra deney motorunun silindir kapagı ve supapları 0,15 mm NiCrAl baglayıcı tabaka üzerine, 0,35 mm kalınlıgında yitriya stabilize zirkonya ($Y _2O _3ZrO _2$) atmosferik plazma spreyi yöntemi ile kaplanarak deney motoru düsük ısı kayıplı hale getirilmistir. Deneyler sonucunda biyodizel yakıtının kullanılması ile egzoz gazı sıcaklıkları yaklasık %9, duman koyulugu %56 ve $CO _2$ emisyonları yaklasık %16 azalırken, $NO _x$ emisyonları %38 artmıstır. DIK motor uygulaması ile de egzoz gazı sıcaklıkları %13, $NO _x$ emisyonu %20 artarken, duman koyulugunda %10’luk azalma oldugu belirlenmistir.

Full load exhaust emission characteristics of a biodiesel fueled low heat rejection diesel engine

In this study, effect of biodiesel on exhaust emissions of a Low Heat Rejection (LHR) diesel engine has been investigated experimentally. Biodiesel was produced from refined sunflower oil by transesterification method. Biodiesel fuel was used in a turbocharged direct injected diesel engine at full load conditions. Then, cylinder head and valves of the test engine were coated with yttria stabilized zirconia ($Y _2O _3ZrO _2$) layer 0.35 mm thick over a NiCrAl bond coat 0.15 mm thick by atmospheric plasma spray coating method. As a result of the engine tests, while exhaust gas temperature, smoke opacity and $CO _2$ emissions were decreased 9 %, 56% and 16 %, respectively, $NO _x$ emission was increased by 38% with biodiesel usage. It was determined that exhaust gas temperature and $NO _x$ emissions were increased 13%, 20% respectively, smoke opacity was decreased 10% with LHR application.

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