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.
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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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