Pengaruh Pembersihan Biogas Menggunakan Larutan NaOH terhadap Performa Motor Bensin: Studi Komparatif RPM, Torsi, Konsumsi Bahan Bakar, dan Emisi Gas Buang

Yudhi  Chandra Dwiaji

doi:10.52158/6t3chv51

Authors

Yudhi Chandra Dwiaji Universitas Mercubuana https://orcid.org/0000-0003-4350-4498

DOI:

https://doi.org/10.52158/6t3chv51

Keywords:

biogas, NaOH purification, four-stroke gasoline engine, engine performance, exhaust gas emissions

Abstract

This study investigates the effect of biogas purification using sodium hydroxide (NaOH) solution on the performance of a four-stroke gasoline engine. Biogas is a promising renewable energy source, but the presence of contaminants such as CO₂, H₂S, and water vapour reduces its calorific value and can cause corrosion in engine components. In this research, biogas is purified using NaOH solution with four concentration levels (0%, 10%, 20%, and 30%), and then supplied to a gasoline engine as an alternative fuel. The measured parameters include engine speed (RPM), torque, brake specific fuel consumption (BSFC), exhaust gas temperature, and exhaust emissions (CO, CO₂, HC, O₂) under several load conditions. The results indicate that a NaOH concentration of 20% is optimal, reducing CO₂ content by about 70% and significantly increasing CH₄ purity, which leads to an improvement in torque by approximately 8–12% and a reduction in BSFC compared to untreated biogas. Furthermore, the purified biogas lowers CO and HC emissions and slightly reduces CO₂ emissions relative to raw biogas, demonstrating better combustion quality and environmental performance while maintaining engine operation that is comparable to gasoline fuel.

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