Geology Reference
In-Depth Information
The resolution of Eq. (D.15) is given in Table D.7.
If the ambient temperature is different to that of the standard, then b
i
is replaced
by b
i
in Eq. (D.3) (see Eq. (D.18)). And b
i
is calculated with Eq. (D.19).
b
fuel
= b
CH
h
O
o
N
n
S
s
+ wb
W
+ zb
Z
(D.18)
b
i
= H
f;i
T
0
s
i
X
f
j
j;00
(D.19)
The enthalpy and entropy of the clean fuel and the moisture for liquid and solid
fuels is obtained with Eqs. D.20 and D.21.
Z
T
H
f;i
= H
f;i
+
C
p
(T)dT
(D.20)
T
0
Z
T
C
p
(T)
T
s
i
= s
i
+
dT
(D.21)
T
0
The specific heat for liquid fuels at a density of 15
C (
15
) included in an interval
between 0.75 and 0.96 kg=dm
3
, can be obtained through Eq. (D.22) in cal/(kgK)
(Perry and Chilton, 1992).
1
p
15
(181 0:81T)
C
p;L
(T) =
(D.22)
The specific heats in cal/(kgK) for the clean solid fuel, the moisture W and
the ashes, Z, are ascertained with the correlations of Kirov
24
(Perry and Chilton,
1992):
C
p;F
(T) = 52 + 0:909T 0:420 10
3
T
2
(D.23)
C
p;W
(T) = 703 + 0:632T + 9:610 10
6
=T
2
(D.24)
C
p;Z
(T) = 142 + 0:140T
(D.25)
The exergy of ashes, Z, is obtained directly through Eq. (D.26):
Z
T
1
T
0
T
b
Z
=
C
Z
dT
(D.26)
T
0
24
Note that C
p;L
, C
p;F
and C
p;W
must be converted into cal/(molK) for the calculation of the
enthalpy and entropy.
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