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HAMADA BOILER WEB CATALOGUE
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COMPARISON BETWEEN FLUIDIZED BED AND CHAIN STOKER
 
Hamada Fluidized Bed
Combustion
Travelling Chaingrate
Coal Specification
Coal Size
0~10 mm
15 ~ 50 mm
Coal Price
Cheaper ( ± 23 % )
More expensive
Ash Content
No Requirement, can use
adaro enviro coal with 1 %
ash content
5 ~ 15 %
Chain Grate need at least 5%
ash content to protect chain
from over heating
Volatile
No Requirement
20 ~ 30 %
Combustion System
Furnace
Temperature
Below 1000 °C
1300 - 1400 °C
SOx Problem ?
With Inject CaCO3 can use
coal with high sulfur
content
Must avoid using Coal
with high sulfur content
NOx Problem ?
No, because low
temperature at the furnace
Yes, Because high temperature at the furnace
Ash Melting
Problem ?
No, Because the combustion
temperature below ash
melting point.
Yes, Because the combustion temperature
is above coal ash melting point ( Indonesian coal is young coal with 1100° ~ 1200° C melting ash temperature ). Melting ash will stick to the chain and Boiler tube, difficult to clean and oiler efficiency become low.
Can Mixed
with other
Solid
Yes, Because fuel that still
can be burn will remain
inside silica sand
No, because chain grate
need fuel with same
size and condition
Combustion
Efficiency
Higher, because fuel can stay long inside the silica sand bed until totally finish combustion
Lower, because bigger coal can not finish burning up to the rear of chain grate and will fall down to ash disposal and fine coal will fly and carried away by the induced draft without burning

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