perhitungan effisiensi boiler (asme ptc 4.1)
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Perhitungan Effisiensi Boiler (ASME PTC 4.1)
•Indirect Method
Boiler efficiency (%) = 100 % – (L1+L2+L3+L4+L5+L6+L7+L8)
Perhitungan indirect methode tidakmenyertakan beberapa losses sebagaiberikut :•Standby Losses•Soot Blower Steam•Blowdown Loss•Penggunaan energi untuk peralatanpenunjang (auxiliary equipments)
Loss due to Dry Gas
Loss due to hydrogen in fuel
Loss due to moisture in fuel
L1
L2
L3
Perhitungan Effisiensi Boiler (ASME PTC 4.1)
Losses Pada Indirect Method
Perhitungan Effisiensi Boiler (ASME PTC 4.1)
L4
L5
L6
Loss moisture due to in Air
Partial Combustion Of C to CO
Surface Heat Losses
Losses Pada Indirect Method
Data OperasionalTipe boiler IHI-FM SR Single Drum Natural Circulation Reheat Type
Bahan Bakar
Ultimate Analisis Unit Residual Oil Gas Alam
Carbon % Wt 80,12 75,07Hidrogen % Wt 8,02 22,89Nitrogen % Wt 8,29 1,37Sulfur % Wt 2,59 0Moisture % Wt 0 0Oksigen % Wt 1,4 0,65HHV Kca/lkg 10245 12660Spesific gravity 0,973 0,66Laju bahan bakar l,/hr :
SCF/hr 33630 332,19
Flue gas analisis
Nitrogen % Wt 84,6
CO2 %Wt 12,25
CO % Wt 0
Oksigen % Wt 3,15Flue gas temperatur °C 161,45Ambient temperatur °C 31,1Humadity relative % 55,67Humadity ratio 0,0159H ifi b K l/k °C 0 238
Air Fuel Ratio•Udara teoritis yang dibutuhkan (Theoretical air required, TA)
Dirumuskan : TA 100
S)] x (4.35 + /8)}O - (H x [{34.8 + C) x [(11.6 22=
Residual Oil : TA = 12,13 kg/ kg bahan bakar oil
Gas Alam : TA = 16,46 kg/ kg bahan bakar gas alam
•Kelebihan udara yang tersedia (Excess Air supplied , EA)
EA = (O2 x 100) / (21 - O2)
EA = 17,64 %
udara berlebih yang ikut dipanaskan yaitu 17,64 % dari udara yang diumpankan ke boiler
Air Fuel Ratio•Massa aktual udara yang tersedia (Actual mass of air supplied, AAS)
Dirumuskan : AAS=
Residual Oil : AAS = 14,28 kg/ kg bahan bakar oil
Gas Alam : AAS = 19,58 kg/ kg bahan bakar oil
•Laju udara yang diumpankan ke boiler (
{1 + EA/100} x theoritical air dalam kg/kg bahan bakar
air )
air =
Residual Oil :
Gas Alam :
=
=
467093,89 kg/hr = 467,09 ton/hr
120808,37kg/hr = 120,8 ton/hr
Total udara bakar adalah 587902,26kg/hr
Air Fuel Ratio
•Massa flue gas
=
Residual Oil =
Gas alam =
14,79 kg/kg of residual oil
17,99 kg/kg gas alam
Total massa gas buang kering = Oil x +[ ] [ ]Oil x
= 587902,52 kg/hr
= 587,9 ton/hr
Perhitungan Effisiensi Boiler (ASME PTC 4.1)
•Direct MethodBoiler efficiency(%) =
=
=
=
=
87,52 %
]
361.680.003 kcal/hr
Boiler efficiency(%) =
422.639.366 kcal/hr
+
=