Sunday, April 5, 2015

Batu Bara


Kualitas batu bara dibedakan menjadi 3 yaitu :
  1. Medium Caloric Value (5800 kCal/kg)
  2. Low Caloric Value (5100 kCal/kg)
  3. Low Rank Coal (4200 - 4800 kCal/kg)
Urutan Pembentukan Batu Bara :
Wood - Peat - Lignite - Subbituminous - Bituminous - Anthracite



Ada kalanya batu bara yang disimpan di Coal Yard akan terbakar sendiri dan fenomena ini sering dipermasalahkan dalam penyimpanan dan penanganan batu bara. 
Proses Coal Self Combustion of Low Rank Coal (≥35% Moisture)
  1. Mula - mula batubara akan menyerap oksigen dari udara secara perlahan - lahan dan kemudian temperature batubara akan naik. 
  2. Sebagai akibat temperature naik, kecepatan batubara menyerap oksigen dari udara bertambah dan temperature kemudian akan mencapai 100 - 140 oC.
  3. Setelah mencapai temperature 140 oC, uap dan CO2 akan terbentuk.sampai temperature 230 oC, 
  4. Isolasi CO2 akan berlanjut bila temperature telah berada diatas 350 oC, ini berarti batubara telah mencapai titik sulutnya dan akan cepat terbakar.
Coal Yard PLTU BL

Belt Conveyor Coal Yard

"Sometimes coal that stored in the coal yard will self combustion and this phenomenon often be asked to handling coal
Process coal self combustion of low rank coal (≥35% moisture)
  1.  At first, coal will absorb oxygen from air little by little and then temperature coal will raise
  2. As effect of raise temperature, adding of velocity coal to absorb oxygen from air and temperature will reach 100 - 140 oC
  3. After reach temperature 40 oC, vapor and CO2 will produce temperature 30 oC
  4. Isolation of CO2 will continue if temperature above 350 oC, this means coal has been reach flash point and will easy self combustion"
Referensi :
[1] Understanding self ignition of coal
[2] Federal Institute For Material Research and Testing 
[3] Materi presentasi pembangkitanCatatan dan pengalaman pribadi 

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