Studi Numerik Pengaruh Variasi Temperatur Air Heater Terhadap Karakteristik Pengeringan Batubara Pada Fluidized Bed Coal Dryer Dengan Tube Heater Tersusun Aligned

Kurniawan, Andi (2012) Studi Numerik Pengaruh Variasi Temperatur Air Heater Terhadap Karakteristik Pengeringan Batubara Pada Fluidized Bed Coal Dryer Dengan Tube Heater Tersusun Aligned. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kebutuhan batubara sebagai sumber energi primer diprediksi akan mengalami kenaikan di masa depan. Kebijakan pemerintah lewat rencana bauran energi nasional secara jelas memprioritaskan pemakaian batubara hingga 33% untuk pemenuhan kebutuhan energi nasional. Sebagian besar cadangan batubara Indonesia adalah batubara dengan kualitas rendah. Batubara kualitas rendah cenderung memiliki kandungan air yang besar sehingga kurang efektif dalam pemakaiannya sebagai bahan bakar. Berdasarkan kondisi tersebut diperlukan suatu teknologi yang dapat meningkatkan kualitas batubara dengan mengurangi kandungan air di dalamnya. Salah satu model pengeringan batubara adalah fluidized bed coal dryer. Penelitian terkait model pengeringan batubara khususnya fluidized bed coal dryer menjadi menarik untuk dilakukan sebagai upaya untuk membantu memecahkan masalah terkait energi batubara. Keterbatasan dalam pengambilan data secara eksperimental serta tuntutan visualisasi dan analisa yang detail dibutuhkan dalam penelitian ini,maka dibutuhkan bantuan metode komputasi dalam pengerjaannya.Penelitian ini dilakukan dengan metode numerik (CFD) dengan software Fluent 6.3.26. Pemilihan kondisi simulasi digunakan model turbulensi k-ε realizable dan skema interpolasi first-order upwind. Pemodelan ii perpindahan massa dilakukan dengan menggunakan model species transport dengan melakukan pengaturan moisture content water pada permukaan batubara. Pada penelitian ini divariasikan temperatur udara pengering, yaitu 316 K, 327 K, 339 K. Dari penelitian ini dapat diketahui karakteristik pengeringan pada ruang pengering batubara tipe fluidized bed dengan tube heater tersusun aligned. Hasil post processing kuantitatif menunjukkan peningkatan temperatur air heater diikuti dengan peningkatan koefisien perpindahan panas dan massa serta laju perpindahan massa. Pengurangan laju moisture content terbesar didapatkan pada temperatur air heater 339K diikuti temperatur 327K serta 316K. Konfigurasi tube heater secara aligned menimbulkan proses heating disertai proses humidifikasi. Kondisi udara di sekitar tube heater mengalami peningkatan temperatur dan humidity ratio serta penurunan relative humidity. Proses humidifikasi diakibatkan adanya konsentrasi perpindahan massa moisture batubara di sekitar tube heater karena nilai relative humidity udara di sekitar tube heater yang lebih rendah daripada batubara di sekitarnya. ======================================================================================================== Demand for coal as a primary energy source is predicted to rise in the future. Government policy through the plan of the national energy mixture is clearly prioritize the use of coal to 33% for the national energy needs. Most of Indonesia's coal reserves is low quality coal. Low quality coal is likely to have a large water content making it less effective in its use as a fuel. Under these conditions we need a technology that can improve the quality of coal by reducing the water content in it. One model coal dryer is a fluidized bed coal drying. Research about coal drying model in particular fluidized bed coal dryer to be interesting to do in an effort to help solve problems related to coal energy. Limitations in the experimental as well as data retrieval with detailed analysis and visualization is needed in this study, therefore we need the help of computational methods to do this research.This research is done by numerical methods (CFD) with software Fluent 6.3.26. The selection of used models simulating conditions is turbulence model with realizable k-ε scheme first-order upwind interpolation. Modeling of mass transfer is done using the model species transport by setting water on the surface moisture content of coal. In this study the drying air temperature was varied, ie 316 K, 327 K, 339 K. iv From this study it can be known drying characteristics at drying chamber on fluidized bed coal dryer with tube heater arranged aligned. Quantitative results in post processing showed that increasing temperature of the air heater is followed by increasing in heat and mass transfer coefficient with mass transfer rate. Greatest reduction in the rate of moisture content obtained at the temperatures air heater 339K followed 327K and 316K. Tube heater arranged aligned cause heating process with humidification. Condition of air around the tube heater have increase temperatures and humidity ratio with decrease in relative humidity. Humidification process caused the concentration of mass transfer moisture content of coal around the tube heater because the relative humidity of air around the heater tube is lower than the surrounding coal

Item Type: Thesis (Undergraduate)
Additional Information: RSM 662.623 Kur s
Uncontrolled Keywords: Fluidized Bed Coal Dryer, Aligned Tube Heater, CFD, Laju Pengeringan, Moisture content, Humidifikasi
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 24 Feb 2021 04:49
Last Modified: 24 Feb 2021 05:10
URI: https://repository.its.ac.id/id/eprint/82757

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