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Calculation of Bolier Feed Water & Blowdown rates.
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https://enggyd.blogspot.com/p/calculator.html
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Calculations:
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CBFW =0.25
Enter concentration of boiler feed water
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CBD =15
Enter concentration of blow down water
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FSTM =200000kg/h
Enter the required flow rate of steam from boiler
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FBD / FBFW = CBFW / CBD = X /100
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X = (FBD / FBFW) *100
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FBD / FBFW =
0.01666666667
FBFW*CBFW = FBD*CBD
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FBD =0.01666666667×FBFWEquation 1
CBFW / CBD = FBD / FBFW = X / 100
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CC = CBD / CBFW = 100 / X
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FBFW = FSTM + FBD
Equation 2
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FBFW = Feedwater flow, kg/h (lb/h)
CC = Cycles of concentration, dimensionless
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From Equation 1 & 2
FBD = Blowdown flow, kg/h (lb/h)
X = % blowdown, percent of boiler feedwater
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FSTM = Steam flow, kg/h (lb/h)
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0.9833333333
×FBFW = FSTM =
200000
CBFW = Solids concentration in boiler feedwater, ppm
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CBD = Solids concentration of blowdown (circulating boiler water), ppm
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FBFW =203389.8305kg/h
Boiler Feedwater quantity
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FBD =3389.8kg/h
Blow down quantity
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