Electronic Theses and Dissertation

Pirolisis batubara berperan penting dalam mengubah batubara peringkat rendah
menjadi sumber energi yang efisien. Penelitian ini mengkaji pengaruh ukuran
partikel (5, 10, 15 mesh) dan laju pemanasan (20, 40, 60 K/menit) terhadap kinetika
dan termodinamika pirolisis batubara peringkat rendah Aceh pada suhu 20–600 °C.
Model kinetika Kissinger, Coast-Redfern, dan DAEM digunakan untuk
menganalisis data, dengan energi aktivasi berkisar 37–120 kJ/mol. Model DAEM
terbukti lebih akurat dalam menganalisis proses multi-tahap. Hasil termodinamika
menunjukkan bahwa proses pirolisis bersifat endotermik dan tidak spontan, dengan
nilai entalpi (ΔH) 2,6–7,3 kJ/mol, energi bebas Gibbs (ΔG) 89–431 kJ/mol, dan
entropi (ΔS) negatif –332 kJ/mol/s, yang mencerminkan pembentukan arang yang
teratur. Ukuran partikel dan laju pemanasan terbukti memengaruhi pelepasan
volatil dan efisiensi degradasi termal. Penelitian ini memberikan pemahaman
mendalam tentang kinetika dan termodinamika pirolisis batubara peringkat rendah
Aceh, yang dapat digunakan untuk mengoptimalkan proses konversi energi dalam
aplikasi industri.
Kata kunci: Batubara peringkat rendah, Pembakaran, Pirolisis, Thermogravimetri,
Laju konversi massa

Coal pyrolysis plays a crucial role in transforming low-rank coal into efficient energy sources. This research endeavor seeks to explore the impacts of particle dimensions and thermal heating rates on the pyrolysis kinetics and thermodynamic of Aceh low-rank coal by varying temperature at 20-600oC, micron particle size 5, 10, 15 Mesh, and heating rate at 20,40, and 60 K/min, by determining which these variables affect thermal degradation and the underlying reaction mechanisms. Mathematical modeling can be compared with the Kissinger, Coast-Redfern, Distributed Activation Energy Model (DAEM) model. The activation energies ranged from 37 to 120 kJ/mol, with DAEM providing a more accurate, multi-step analysis. Thermodynamic analysis revealed positive enthalpy (ΔH) and Gibbs free energy (ΔG) values, indicating an endothermic, non-spontaneous process, while negative entropy (ΔS) during decomposition suggests ordered char formation, are computed to be 2.6-7.3 kJ/mol, –332 kJ/mol/s, and 89-431 kJ/mol, respectively. Notably, this study highlights the impact of particle size and heating rate on the efficiency of volatile release, providing a nuanced understanding of the degradation pathways. The findings contribute to the broader field of coal pyrolysis by demonstrating the specific kinetics of Aceh’s low-rank coal, offering insights into its optimization for industrial applications. Keywords: Low Rank Coal (LRC), Combustion, Pyrolisis, TGA, Mass conversion rate.