Study Of Atkinson Cycle In Four-Stroke Diesel Engine To Reduce Nox Emission During Low Load Condition On Marine Diesel Generator By Simulation Method

Utomo, R. AlGhani Labib (2024) Study Of Atkinson Cycle In Four-Stroke Diesel Engine To Reduce Nox Emission During Low Load Condition On Marine Diesel Generator By Simulation Method. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

The Atkinson cycle is a thermodynamic cycle used in some internal combustion engines to improve fuel efficiency while reducing power output. It is named after James Atkinson, who first proposed this cycle in 1882. This cycle is a modification of the Otto cycle, which is the traditional cycle used in most gasoline engines. The Atkinson cycle engine achieves energy efficiency by varying the timing of the compression and expansion strokes compared to the traditional Otto cycle. An experimental study was conducted on the potential of the Atkinson cycle and the reduction of inlet oxygen concentration for contaminant control in heavy duty diesel engines. Low load operations are typical but not limited to offshore vessels equipped with dynamic positioning systems. The low load operation of a diesel engine results in lower cylinder pressures and therefore lower temperatures. Low temperatures can cause ignition problems and poor combustion, leading to increased soot formation and accumulation of unburned fuel in the cylinder. Low load mechanisms lead to degradation cycles, meaning that diesel engines operating at low load for long periods of time can be irreversibly damaged. Most modern diesel engines operate at lower cylinder pressures and therefore lower temperatures to comply with the IMO's strict NOx emissions requirements. recent developments such as common rail, variable injection timing and variable valve timing allow engines to operate at lower loads than before. NOx emission is found in an engine due to higher in-cylinder temperature. Though the diesel fuel or the ester-based biodiesel does not contain nitrogen, the NOx are formed by taking the nitrogen from the air because 78% of nitrogen is present in the air. This analysis focuses on the thermodynamic conditions of the cylinder gases, combustion, emissions, and engine performance. Regarding exhaust emissions, the Atkinson cycle significantly reduces nitrogen oxides but increases soot emissions.
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Siklus Atkinson adalah siklus termodinamika yang digunakan di beberapa mesin pembakaran internal untuk meningkatkan efisiensi bahan bakar sekaligus mengurangi keluaran daya. Namanya diambil dari nama James Atkinson yang pertama kali mengusulkan siklus ini pada tahun 1882. Siklus ini merupakan modifikasi dari siklus Otto, yang merupakan siklus tradisional yang digunakan pada sebagian besar mesin bensin. Mesin siklus Atkinson mencapai efisiensi energi dengan memvariasikan waktu langkah kompresi dan ekspansi dibandingkan dengan siklus Otto tradisional. Sebuah studi eksperimental dilakukan mengenai potensi siklus Atkinson dan pengurangan konsentrasi oksigen masuk untuk pengendalian kontaminan pada mesin diesel tugas berat. Operasi muatan rendah adalah tipikal namun tidak terbatas pada kapal lepas pantai yang dilengkapi dengan sistem penentuan posisi dinamis. Pengoperasian mesin diesel dengan beban rendah menghasilkan tekanan silinder yang lebih rendah dan karenanya suhu yang lebih rendah. Temperatur yang rendah dapat menyebabkan masalah pengapian dan pembakaran yang buruk, sehingga menyebabkan peningkatan pembentukan jelaga dan penumpukan bahan bakar yang tidak terbakar di dalam silinder. Mekanisme beban rendah menyebabkan siklus degradasi, artinya mesin diesel yang beroperasi pada beban rendah dalam jangka waktu lama dapat mengalami kerusakan permanen. Kebanyakan mesin diesel modern beroperasi pada tekanan silinder yang lebih rendah dan oleh karena itu suhunya juga lebih rendah untuk memenuhi persyaratan emisi NOx yang ketat dari IMO. Perkembangan terkini seperti common rail, timing injeksi variabel, dan timing katup variabel memungkinkan mesin beroperasi pada beban yang lebih rendah dari sebelumnya. Emisi NOx ditemukan di mesin karena suhu dalam silinder yang lebih tinggi. Meskipun bahan bakar diesel atau biodiesel berbahan dasar ester tidak mengandung nitrogen, namun NOx terbentuk dari pengambilan nitrogen dari udara karena 78% nitrogen terdapat di udara. Analisis ini berfokus pada kondisi termodinamika gas silinder, pembakaran, emisi, dan performa mesin. Mengenai emisi gas buang, siklus Atkinson secara signifikan mengurangi nitrogen oksida tetapi meningkatkan emisi gas buang.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Atkinson Cycle, Otto Cycle, NOx, IMO, Emission, Low Load, Siklus Atkinson, Siklus Otto, Emisi, Beban Rendah
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TJ Mechanical engineering and machinery > TJ254.7 Combustion chambers T Technology > TJ Mechanical engineering and machinery > TJ799 Diesel motor--Electronic control. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1001 Production of electric energy or power V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	R.AlGhani Labib Utomo
Date Deposited:	19 Feb 2024 04:38
Last Modified:	19 Feb 2024 04:38
URI:	http://repository.its.ac.id/id/eprint/107442

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