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Economizer Heating Surface and Outlet Flue Gas Temperature Calculation
Inputs = Yellow colour cells
S.NO
Description
Sign
Values
UOM
1
Steam production
Qs
Kg/hr
2
Flue gas inlet temperature
To
^{o}
C
3
Water
Quantity
Qw
home:
It is equal to steam production
Kg/hr
4
Water inlet temperature
to
^{o}
C
5
Water outlet temperature
t
^{o}
C
6
Steam & fuel ratio
R
7
Heat transfer coefficient In economizer
K
home:
As per Hugot 20 to 30 Kcal/m2/hr/oC
kcal/m
^{2}
/hr/
^{o}
C
8
Solid unburned coefficient
α
9
Moisture of bagasse
W
%
10
Excess air
m
%
Result
1
Weight of air
required per kg of bagasse
P
_{a}
home:
5.76 (1-W) m
Kg/hr
2
Weight of the gaseous products of combustion per kg of bagasse
A
home:
5.76(1-W)m + 1
Kg/kg of Fuel
3
Fuel consumption
F
home:
Qs / R
Kg/hr
4
Total air requirement
P
home:
F x Pa
kg/hr
5
Flue gas Quantity
Pg
home:
F X A
Kg/hr
6
Specific heat of water
C
_{W}
Kcal/kg
7
Specific heat of flue gas
C
_{F}
home:
0.27+0.00006T
Kcal/kg
8
Ratio
r
home:
Ratio ( r ) = (α x Pg x Cf )/ (Qw x CW )
9
Flue gas outlet temp
T
home:
Flue gas outlet temp ( T ) = To -( (t - to )/ r )
^{o}
C
10
Heating Surface
S
home:
Heating Surface ( S ) = α PC / K(1-r) ln (To-t)/(T-to)
M
^{2}
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