Studi Eksperimen Pengaruh Kecepatan Inlet Drying Chamber Terhadap Laju Pengeringan Batubara Low-Rank Pada Swirling Fluidized Bed Dryer

Notohardjo, Stevanus Franciscus Wahyudi (2015) Studi Eksperimen Pengaruh Kecepatan Inlet Drying Chamber Terhadap Laju Pengeringan Batubara Low-Rank Pada Swirling Fluidized Bed Dryer. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Salah satu sumber penghasil energi listrik adalah Pembangkit Listrik Tenaga Uap (PLTU). Di Indonesia hampir semua PLTU menggunakan batubara kalori menengah dan rendah sebagai bahan bakar utama yang memiliki kandungan moisture tinggi. Penggunaan batubara dengan nilai kalori rendah dan memiliki moisture tingi pada PLTU akan menurunkan efisiensi dari pembangkit dan dapat berpengaruh terhadap kinerja pulverizer yang akan semakin berat dikarenakan kapasitas batubara yang dibutuhkan untuk pembakaran di boiler semakin banyak. Hal tersebut terjadi karena kualitas batubara yang tersedia tidak sesuai dengan spesifikasi desain awal boiler dimana menggunakan batubara kalori tinggi. Berdasarkan kondisi tersebut, diperlukan suatu teknologi pengeringan yang dapat meningkatkan kualitas batubara, swirling fluidized bed coal dryer merupakan salah satu teknologi model pengeringan batubara dengan prinsip fluidasi dimana udara disirkulasikan sehingga membetuk cyclone untuk mengeringkan. Penelitian dilakukan dengan mengeringkan batubara menggunakan alat yang sudah dirancang oleh peneliti sebelumnya. Pengeringan dilakukan dengan metode Swirling Fluidized Bed Dryer dengan prinsip fluidisasi. Udara panas dihembuskan oleh blower ke dalam chamber dengan melewati blade yang membentuk sudut 100 sehingga menyebabkan swirling pada udara didalam chamber. Pengambilan data dilakukan dengan menimbang berat batubara setiap satu menit sebanyak 5 kali , dua menit sebanyak 3 kali, dan lima menit sebanyak 4 kali. Percobaan dilakukan denganmenggunakan variasi kecepatan fluidisasi minimum 100%, 125%, 150% dari umf, batubara tipe low rank, ukuran partikel batubara 6mm, dengan massa batubara sebanyak 600 gram, pengeringan dilanjutkan menggunakan oven electric dengan temperatur 104-110 ˚C selama 1 jam (menurut standard ASTM D 3173) Hasil yang didapatkan dari experimen ini adalah analisa laju perpindahan panas dan massa, dan laju pengeringan. Ketiga variasi kecepatan yang diplot dalam grafik relative humidity, temperature outlet, moisture content, selisih humidity ratio, selisih massa uap air, drying rate, perbandingan massa air yang dilepas batubara dan diterima udara, dan psychometric chart. ================================================================================================ One source of electrical energy is Steam Power (power plant). In Indonesia, almost all of the power plant using medium and low grade coal as the main fuel that has a high moisture content. The use of coal with low calorific value and has a higher moisture in the plant will reduce the efficiency of the plant and can affect the performance of pulverizer that will be more severe due to the capacity of coal required for combustion in the boiler increase. That case occure because the quality of coal that is available does not correspond to the initial design specification boiler which uses high calorie coal. Under these conditions, we need a drying technology which can improve the quality of coal, coal swirling fluidized bed dryer is one of the coal drying technology models with a fluidizing principle where air is circulated to form cyclone to dry. The study was conducted by drying the coal using a tool that has been designed by previous researchers. Drying is done by methods Swirling Fluidized Bed Dryer with fluidization principle. Hot air is blown by the blower into the chamber by passing the blade at an angle of 10 degree, causing swirling in the air inside the chamber. Data collection was performed by weighing coal every one minute as many as 5 times, two minutes 3 times, and five minutes for 4 times. Experiments conducted using minimum fluidization velocity variations of 100%, 125%,150% of the Umf, the type of low-rank coal, coal particle size 6mm, with a mass of 600 grams of coal, electric drying oven with continued use temperature 104-1100 C for 1 hour ( according to ASTM D 3173) Results obtained from this experiment is the analysis of the rate of heat and mass transfer, and the rate of drying. The third variation of speed is plotted in the graph relative humidity, the outlet temperature, moisture content, humidity ratio difference, the difference between the mass of moisture, drying rate, the ratio of the mass of water discharged and received air coal, and psychometric chart.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 662.623 Not s
Uncontrolled Keywords: Swirling Coal Dryer, Fluidisasi, Psychometric
Subjects: T Technology > TP Chemical technology > TP350 Natural gas--Drying.
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: Yeni Anita Gonti
Date Deposited: 02 Mar 2020 03:19
Last Modified: 02 Mar 2020 03:19
URI: http://repository.its.ac.id/id/eprint/75251

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