Studi Numerik Variasi Laju Aliran Massa Bahan Bakar terhadap Daya Output Tanpa Berakibat Fenomena Slagging, Fouling, dan Overheating pada Boiler

Rahman, Mokhammad Haidar (2026) Studi Numerik Variasi Laju Aliran Massa Bahan Bakar terhadap Daya Output Tanpa Berakibat Fenomena Slagging, Fouling, dan Overheating pada Boiler. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini melakukan simulasi pembakaran co-firing pada boiler menggunakan variasi batu bara dengan nilai kalor 4300, 4000, dan 3800 kCal/kg. Setiap jenis batu bara disimulasikan pada variasi laju aliran massa sebesar 100%, 90%, 80%, dan 70% dari kapasitas maksimal boiler. Hasil simulasi menunjukkan bahwa perbedaan nilai kalor batu bara berpengaruh signifikan terhadap distribusi temperatur, kecepatan flue gas, emisi hasil pembakaran, serta potensi gangguan operasional boiler. Batu bara dengan nilai kalor 3800 kCal/kg menghasilkan temperatur rata-rata furnace tertinggi hingga 1402 °C, sementara batu bara dengan nilai kalor 4300 dan 4000 kCal/kg tidak mampu mencapai temperatur furnace di atas 1150 °C pada seluruh variasi laju aliran massa. Distribusi temperatur dan kecepatan flue gas menunjukkan pola yang serupa pada setiap variasi laju aliran massa untuk nilai kalor yang sama, dengan perbedaan magnitudo akibat perubahan kebutuhan massa bahan bakar. Penurunan nilai kalor menyebabkan peningkatan kecepatan flue gas sebagai konsekuensi dari meningkatnya laju aliran massa bahan bakar. Sebaran emisi CO, CO₂, SO₂, dan NOx menunjukkan karakteristik yang dipengaruhi oleh komposisi bahan bakar dan tingkat kesempurnaan pembakaran. Seluruh variasi tidak memenuhi kondisi terjadinya slagging, namun berpotensi mengalami low temperature fouling. Selain itu, potensi overheating teridentifikasi pada beberapa variasi, khususnya pada laju aliran massa tinggi. Secara umum, seluruh variasi bahan bakar masih dapat digunakan untuk menunjang operasi boiler dalam batas aman, kecuali kondisi-kondisi tertentu yang berpotensi menyebabkan overheating.
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This study investigates the simulation of co-firing combustion in a boiler using coal with calorific values of 4300, 4000, and 3800 kcal/kg. Each coal type was simulated at mass flow rate variations of 100%, 90%, 80%, and 70% of the boiler’s maximum capacity. The simulation results indicate that variations in coal calorific value significantly affect temperature distribution, flue gas velocity, combustion emissions, and the potential for boiler operational disturbances. Coal with a calorific value of 3800 kcal/kg produced the highest average furnace temperature, reaching up to 1402 °C, whereas coal with calorific values of 4300 and 4000 kcal/kg was unable to achieve furnace temperatures above 1150 °C across all mass flow rate variations.The temperature and flue gas velocity distributions exhibit similar patterns for each mass flow rate variation at the same calorific value, with differences in magnitude resulting from changes in fuel mass requirements. A decrease in calorific value leads to an increase in flue gas velocity as a consequence of the higher fuel mass flow rate. The distributions of CO, CO₂, SO₂, and NOx emissions show characteristics influenced by fuel composition and the degree of combustion completeness. None of the simulated variations meet the conditions for slagging; however, all exhibit potential for low-temperature fouling. In addition, overheating potential is identified in several variations, particularly at high mass flow rates. Overall, all fuel variations can still support boiler operation within safe limits, except under certain conditions that may lead to overheating.

Item Type: Thesis (Other)
Uncontrolled Keywords: Co-firing, Slagging, Fouling, Overheating, Boiler
Subjects: Q Science
Q Science > QC Physics
Q Science > QC Physics > QC320 Heat transfer
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Mokhammad Haidar Rahman
Date Deposited: 04 Feb 2026 03:51
Last Modified: 04 Feb 2026 03:51
URI: http://repository.its.ac.id/id/eprint/132044

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