Pengaruh Modifikasi Exhaust Cam Pada Mesin Dual Fuel Diesel - Methanol Terhadap Peningkatan Proporsi Bahan Bakar Metanol Ditinjau Dari Aspek Unjuk Kerja Dan Gas Buang

Nugroho, Pandu Satria (2025) Pengaruh Modifikasi Exhaust Cam Pada Mesin Dual Fuel Diesel - Methanol Terhadap Peningkatan Proporsi Bahan Bakar Metanol Ditinjau Dari Aspek Unjuk Kerja Dan Gas Buang. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Peningkatan kekhawatiran global terhadap pencemaran lingkungan dan keterbatasan cadangan bahan bakar fosil mendorong pengembangan sumber energi alternatif yang lebih bersih untuk mesin pembakaran dalam. Penelitian ini mengkaji pengaruh peningkatan rasio substitusi metanol serta modifikasi exhaust camshaft terhadap performa dan emisi gas buang pada mesin diesel sistem dual fuel. Injeksi metanol dilakukan pada sudut 50° BBDC dengan variasi durasi 5 °CA, 10 °CA, 12 °CA, 14 °CA, 17 °CA. Hasil penelitian menunjukkan bahwa durasi injeksi 12° CA merupakan kondisi optimal yang memberikan keseimbangan antara performa, efisiensi energi, dan emisi. Pada konfigurasi camshaft standar, penggunaan metanol 12° CA meningkatkan daya dari 4,762 kW menjadi 5,030 kW dan torsi dari 22,194 Nm menjadi 22,829 Nm, disertai peningkatan SFOC menjadi 0,330 kg/kWh, namun dengan konsumsi energi yang menurun seiring peningkatan substitusi metanol. Pada camshaft modifikasi, daya dan torsi mencapai 5,020 kW dan 21,793 Nm dengan konsumsi energi serupa, namun nilai SFOC sedikit lebih tinggi, yakni 0,338 kg/kWh. Dari sisi emisi, camshaft modifikasi dengan metanol 12° CA memberikan penurunan NOx paling signifikan sebesar 66% dari 1,704 g/kWh menjadi 0,582 g/kWh, disertai penurunan smoke menjadi 41% dari 6,61% menjadi 3,90% dan CO₂ menurun 27% dari 3,451% menjadi 2,506%. Penelitian ini membuktikan bahwa strategi dual fuel berbasis metanol, terutama saat dikombinasikan dengan modifikasi exhaust camshaft, mampu meningkatkan performa sekaligus menekan emisi, sehingga berpotensi menjadi solusi yang efektif dan ramah lingkungan untuk mesin diesel di masa depan.
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The growing global concern over environmental pollution and the depletion of fossil fuel reserves has driven the development of cleaner alternative energy sources for internal combustion engines. This study investigates the effects of increasing methanol substitution ratios and exhaust camshaft modification on the performance and exhaust emissions of a dual-fuel diesel engine. Methanol injection was carried out at 50° BBDC with varying injection durations of 5°, 10°, 12°, 14°, and 17° crank angle (CA). The results indicate that a 12° CA injection duration is optimal, offering a balanced improvement in performance, energy efficiency, and emissions. Under the standard camshaft configuration, methanol injection at 12° CA increased power from 4.762 kW to 5.030 kW and torque from 22.194 Nm to 22.829 Nm, accompanied by a rise in specific fuel oil consumption (SFOC) to 0.330 kg/kWh, despite a decrease in energy consumption due to higher methanol substitution. With the modified camshaft, power and torque reached 5.020 kW and 21.793 Nm, respectively, with similar energy consumption but a slightly higher SFOC of 0.338 kg/kWh. In terms of emissions, the modified camshaft with 12° CA methanol injection achieved the most significant NOx reduction, decreasing by 66% from 1.704 g/kWh to 0.582 g/kWh, along with a 41% reduction in smoke opacity (from 6.61% to 3.90%) and a 27% decrease in CO₂ emissions (from 3.451% to 2.506%). This study demonstrates that methanol-based dual-fuel strategies, particularly when combined with exhaust camshaft modification, can enhance engine performance while significantly reducing emissions, making them a promising and environmentally friendly solution for future diesel engines.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Dual Fuel, Exhaust Gas Recirculation, Metanol, Port Injection, Unjuk Kerja, Dual Fuel, Exhaust Gas Recirculation, Methanol, Port Injection, Performance
Subjects:	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:	Pandu Satria Nugroho
Date Deposited:	06 Aug 2025 01:45
Last Modified:	06 Aug 2025 01:45
URI:	http://repository.its.ac.id/id/eprint/127669

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