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All Journal Jurnal Teknologi Jurnal Mechanical Journal of Science and Applicative Technology INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Turbo : Jurnal Program Studi Teknik Mesin Jurnal Teknik Mesin Jurnal Teknik Mesin Indonesia MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Prosiding Seminar Nasional Hasil Penelitian Sains, Teknik dan Aplikasi Industri Fakultas Teknik Universitas Lampung Eduvest - Journal of Universal Studies
Amrul Amrul
UNIVERSITAS LAMPUNG
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Neuroscience Social Sciences Transportation

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Numerical Analysis Of Fluid Flow Characteristics In Coal–Woodchips Combustion Within A Circulating Fluidized Bed Furnace (Case Study: Up Sebalang) Moh. Rosifaul Azis; Harmen Harmen; Amrul Amrul
Eduvest - Journal of Universal Studies Vol. 5 No. 7 (2025): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v5i7.51799

Abstract

The increase in energy demand in the industrial era 4.0 has encouraged the transition to renewable energy, but Indonesia's dependence on coal is still high. One of the promising decarbonization strategies is high co-firing technology, which is the mixing of biomass (such as woodchips) with coal in coal-fired power plant boilers. Previous studies have generally focused on the emission and combustion efficiency aspects without delving deeply into the fluid flow characteristics in the furnace. Therefore, this study aims to numerically analyze the characteristics of fluid flow in the combustion process of coal and woodchips mixture in the Circulating Fluidized Bed (CFB) boiler of PLTU UP Sebalang. The methods used are Computational Fluid Dynamics (CFD) simulation with Eulerian multiphase model, k-ε turbulence model, and discrete phase for coal particle injection. Simulations were carried out for three fuel variations: 100% coal, 90% coal + 10% woodchips, and 80% coal + 20% woodchips. The results showed that an increase in the proportion of woodchips lowered the average temperature in the furnace from 945°C to 810°C and caused the heat distribution to be uneven. The pressure distribution also decreases as the woodchips fraction increases, with the negative pressure at the cyclone outlet increasing from -310 Pa to -401 Pa. Validation of the simulation results against the field data showed an average deviation of between 2–9%, still within the tolerance limit, although affected by the imperfections of the measuring tool and the limitations of the model on the effects of induced fan drafts.
Pengaruh Variasi Temperatur Torefaksi Terhadap Karakteristik Wood Pellet dari Limbah Furnitur Kayu Campuran Agus Apriyanto; Amrul Amrul; Hadi Prayitno; Hanifah Nurjanah Iskandar
TURBO [Tulisan Riset Berbasis Online] Vol 14 No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4290

Abstract

Penelitian ini bertujuan untuk mengevaluasi pengaruh proses torefaksi pada wood pellet berbahan limbah furniture campuran terhadap nilai kalor dan sifat kimia sampel. Sampel wood pellet terdiri dari 80% kayu keras (Meranti, Merbau, Ulin, Mahoni, Keruing) dan 20% kayu lunak (Sengon, Pinus), diproses melalui torefaksi pada temperatur 250°C, 275°C, dan 300°C selama 30 menit. Pengujian nilai kalor dilakukan untuk menentukan peningkatan energi, dan analisis proximate serta ultimate dilakukan untuk mengetahui perubahan sifat kimia. Hasil menunjukkan bahwa nilai kalor meningkat secara signifikan setelah proses torefaksi, dengan peningkatan tertinggi pada temperatur 300°C mencapai 5.161 kkal/kg atau naik sekitar 32,3% dibandingkan nilai kalor awal 3.902 kkal/kg. Uji proximate menunjukkan peningkatan kandungan karbon tetap dan abu, serta penurunan kadar air dan zat volatil. Uji ultimate menunjukkan peningkatan kadar karbon hingga 60,19% dan penurunan kadar oksigen hingga 26,61% pada temperatur 300°C. Selain itu, torefaksi meningkatkan sifat hidrofobik wood pellet, terbukti dari ketahanan terhadap perendaman air yang lebih tinggi. Berdasarkan hasil ini, dapat disimpulkan bahwa torefaksi pada temperatur tinggi (300°C) secara efektif meningkatkan kualitas energi dan kestabilan wood pellet, menjadikannya alternatif bahan bakar biomassa yang lebih efisien dan tahan terhadap kelembapan. 
Co-Authors A.Yudi Eka Risano Agung Ariwibowo Agus Apriyanto Amrizal Danur Sasongko Angelia Eka Salsabillah Choirul Anam Dedi Triyadi Dinata, Ragil Alvin Figo Naufal Pratama Hadi Prayitno Hanifah Nurjanah Iskandar Harmen Harmen Herry Wardono Imam Prasetyo Indra Mamad Gandidi Kurniawan, Dondi Mafruddin Mafruddin Moh. Rosifaul Azis Muhammad Aidil Muhammad Irsyad Muhammad Irsyad Mustafa Faris Fathin Nazarudin, Rizal Nikolaus Derry Chandra Retno Wahyudi Saputra, Eko Wahyu Zaenal Arifin