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Rian Kadir
Program Studi Teknik Mesin, Universitas Nahdlatul Ulama Gorontalo

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ANALISIS TERMODINAMIKA SISTEM PLTU ANGGREK KAPASITAS 2X25 MW MENGGUNAKAN BAHAN BAKAR CO-FIRING BIOMASSA: ANALISIS TERMODINAMIKA SISTEM PLTU ANGGREK KAPASITAS 2X25 MW MENGGUNAKAN BAHAN BAKAR CO-FIRING BIOMASSA lilis karim; Romi Djafar; Rian Kadir; Yunita Djamalu; Moh. Riyandi Badu
Journal of Energy and Mechanical Engineering Vol. 3 No. 1 (2025): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.v3i1.18

Abstract

Coal-fired power plants (PLTUs) play a crucial role in the national electricity system due to their ability to generate electricity on a large scale. The 2x25 MW Anggrek Steam Power Plant in North Gorontalo Regency is one of the power plants that has implemented Lamtoro biomass cofiring technology. This study aims to analyze the thermodynamic performance of the 2x25 MW Anggrek Steam Power Plant (PLTUs) under two conditions: existing (100% coal) and cofiring (85% coal + 15% lamtoro biomass). The method employed in this study utilizes thermodynamic law analysis, supplemented by cycle tempo simulations, to evaluate boiler and power cycle efficiency. The results show boiler efficiency under cofiring conditions of 82.45% (direct method) and 87.04% (heat duty method). The power cycle efficiency decreased from 23.336% (existing) to 21.652% (cofiring) due to the lower heating value of the biomass. Therefore, despite the decrease in efficiency, cofiring lamtoro biomass remains a feasible alternative fuel in PLTUs because it can maintain operational stability and has the potential to reduce carbon emissions.
PEMODELAN SISTEM PLTU ANGGREK 2 X 25 MW MENGGUNAKAN SOFTWARE CYCLE TEMPO DENGAN BAHAN BAKAR CO-FIRING BATUBARA DAN LAMTORO: PEMODELAN SISTEM PLTU ANGGREK 2 X 25 MW MENGGUNAKAN SOFTWARE CYCLE TEMPO DENGAN BAHAN BAKAR CO-FIRING BATUBARA DAN LAMTORO Rizki Mohamad; Romi Djafar; Rian Kadir; Yunita Djamalu; Syaiful Umela
Journal of Energy and Mechanical Engineering Vol. 3 No. 1 (2025): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.v3i1.19

Abstract

As Indonesia's population grows, the need for electrical energy increases. To meet this demand, the government is required to build power plants, one of which is a Steam Power Plant (PLTUs). However, PLTUs still rely on coal as their primary fuel, which contributes significantly to carbon emissions. One effort to reduce these emissions is the implementation of biomass cofiring technology as a more environmentally friendly alternative energy source. This study aims to model the thermal system of the Anggrek 2×25 MW PLTUs using Cycle Tempo 5.0 software and evaluate the system performance at varying cofiring ratios of coal with lamtoro biomass, specifically 10%, 15%, 20%, 25%, and 30%. The research method employed a cycle tempo simulation, utilizing input parameters derived from the actual operational data of the Anggrek PLTUs. The system model built was used to compare the performance of the PLTUs under existing conditions with various fuel mixture variations. The simulation results showed that the addition of lamtoro biomass to the fuel mixture reduced the efficiency of the thermal system due to the lower heating value of biomass compared to coal. The results based on existing conditions of 100% coal provided the highest efficiency, namely gross power of 23.23% and net power of 22.23%. At the same time, the 10% cofiring variation achieved a gross power efficiency of 21.98% and a net power of 21.02%. Meanwhile, a 15% variation yielded a gross power of 21.32% and a net power of 20.37%. Furthermore, a 20% variation yielded a gross power of 21.00% and a net power of 20.03%. A 25% variation yielded a gross power of 20.56% and a net power of 19.61%. Finally, a 30% variation yielded a gross power of 20.31% and a net power of 19.36%. Thus, this study demonstrates that cofiring lamtoro biomass can be a strategy to reduce dependence on coal and reduce carbon emissions, although system efficiency tends to decrease.
PERANCANGAN ALAT PENCETAK BRIKET SISTEM PNEUMATIK DAN PENGUJIANNYA Haeril Ikram; Yunita Djamalu; Syaiful Umela; Romi Djafar; Rian Kadir
Journal of Energy and Mechanical Engineering Vol. 3 No. 1 (2025): Journal of Energy and Mechanical Engineering (Desember)
Publisher : Fakultas Sains dan Teknologi - Universitas Nahdlatul Ulama Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62299/jeme.v3i1.21

Abstract

The growing demand for energy has led to the exploration of renewable resources as alternatives to fossil fuels. Coconut shells, as a type of biomass, are highly potential to be processed into briquettes. This study focuses on designing and testing a pneumatic-based briquette press to produce briquettes that meet quality requirements. An experimental method was applied, consisting of tool design, fabrication, and performance testing. The results indicated that the single-acting pneumatic press was capable of producing 10 square briquettes per cycle with an average time of approximately one minute. The compressive strength ranged from 14.553 to 17.410 kN, which complies with Indonesian National Standard (SNI) and demonstrates good briquette density. Moisture content values were recorded between 2.4% and 7.7%, still below the maximum threshold of 8% based on SNI 01-6235-2000. Combustion tests showed that the briquettes could burn for up to 90 minutes with a peak temperature of around 120°C. The use of pneumatic technology provided faster production, more uniform shapes, and lower energy consumption compared to manual processes. Therefore, this machine has significant potential to promote environmentally friendly and sustainable alternative energy use.
Co-Authors Haeril Ikram lilis karim Moh. Riyandi Badu Rizki Mohamad Romi Djafar Syaiful Umela Yunita Djamalu