Studi Numerik Pengaruh Temperatur Dan PA/Coal Ratio Pada Mill Pulverizer MPS 160HP-II Untuk Mencegah Spontaneous Combustion

Firjatullah, Muhammad Fathan (2026) Studi Numerik Pengaruh Temperatur Dan PA/Coal Ratio Pada Mill Pulverizer MPS 160HP-II Untuk Mencegah Spontaneous Combustion. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Batubara peringkat rendah atau Low Rank Coal (LRC) memiliki kandungan air tinggi sehingga memerlukan proses pengeringan yang optimal sebelum dialirkan menuju ruang bakar. Namun, temperatur udara pengering dan rasio udara primer terhadap batubara yang terlalu tinggi dapat meningkatkan Mill Outlet Temperature (MOT) dan memicu spontaneous combustion. Penelitian ini bertujuan menganalisis pengaruh temperatur udara primer dan primary air to coal ratio (PA/Coal) terhadap distribusi temperatur dan karakteristik pengeringan batubara pada mill pulverizer MPS 160HP-II. Batubara yang digunakan memiliki Higher Heating Value (HHV) sebesar 3465 kcal/kg dan moisture content awal 38,9%. Penelitian dilakukan secara numerik menggunakan metode Computational Fluid Dynamics (CFD) pada ANSYS Fluent dengan model turbulensi realizable k-ε, Discrete Phase Model, perpindahan energi, evaporasi, dan species transport. Variasi temperatur udara primer sebesar 285°C, 300°C, dan 315°C dilakukan pada PA/Coal 2,2, sedangkan variasi PA/Coal sebesar 2,0; 2,2; dan 2,6 dilakukan pada temperatur inlet 315°C. Peningkatan temperatur inlet dari 285°C menjadi 315°C meningkatkan MOT dari 61,7°C menjadi 66,5°C serta menurunkan moisture content akhir dari 19,02% menjadi 16,83%. Sementara itu, peningkatan PA/Coal dari 2,0 menjadi 2,6 meningkatkan MOT dari 63,2°C menjadi 75,1°C dan menurunkan moisture content dari 17,69% menjadi 13,77%. Kondisi operasi yang direkomendasikan untuk variasi temperatur adalah 300°C dengan PA/Coal 2,2, yang menghasilkan MOT 63,7°C dan moisture content 17,93%. Untuk variasi PA/Coal, kondisi yang direkomendasikan adalah temperatur 315°C dengan PA/Coal 2,0, yang menghasilkan MOT 63,2°C dan moisture content 17,69%. Kedua kondisi tersebut memberikan pengeringan yang baik dengan MOT masih di bawah batas aman 65°C.
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Low-rank coal (LRC) has a high moisture content and therefore requires an effective drying process before being transported to the furnace. However, excessively high primary air temperatures and primary air-to-coal ratios may increase the Mill Outlet Temperature (MOT) and the risk of spontaneous combustion. This study aims to analyze the effects of primary air temperature and the primary air-to-coal ratio (PA/Coal) on temperature distribution and coal-drying characteristics in an MPS 160HP-II pulverizer mill. The coal used in this study had a Higher Heating Value (HHV) of 3,465 kcal/kg and an initial moisture content of 38.9%. A numerical analysis was conducted using the Computational Fluid Dynamics (CFD) method in ANSYS Fluent, incorporating the realizable kkk-ε\varepsilonε turbulence model, Discrete Phase Model, energy transfer, evaporation, and species transport. Primary air temperatures of 285°C, 300°C, and 315°C were investigated at a constant PA/Coal ratio of 2.2. Meanwhile, PA/Coal ratios of 2.0, 2.2, and 2.6 were investigated at a constant inlet temperature of 315°C. The numerical model produced an MOT validation error of 2.7% compared with the actual operating data. Increasing the inlet temperature from 285°C to 315°C increased the MOT from 61.7°C to 66.5°C and reduced the final moisture content from 19.02% to 16.83%. Increasing the PA/Coal ratio from 2.0 to 2.6 increased the MOT from 63.2°C to 75.1°C and reduced the final moisture content from 17.69% to 13.77%. The recommended operating condition for the inlet-temperature variation was 300°C at a PA/Coal ratio of 2.2, resulting in an MOT of 63.7°C and a final moisture content of 17.93%. For the PA/Coal ratio variation, the recommended condition was an inlet temperature of 315°C at a PA/Coal ratio of 2.0, resulting in an MOT of 63.2°C and a final moisture content of 17.69%. Both operating conditions provided effective coal drying while maintaining the MOT below the safe limit of 65°C.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Batubara, Coal Pulverizer Mill, CFD, Distribusi Temperatur, Pengeringan, Spontaneous Combustion, Coal, Pulverizer, CFD Simulation, Temperature Distribution, Drying
Subjects:	Q Science > QC Physics > QC320 Heat transfer
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Fathan Firjatullah
Date Deposited:	02 Aug 2026 11:05
Last Modified:	02 Aug 2026 11:05
URI:	http://repository.its.ac.id/id/eprint/142106

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