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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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It is a On-line calculator allowing for evaluating only. If you will give input values in yellow colour cells than you will get remaining values automatically. It also provided print option as well as reset options
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