Environmental Engineering Reference
In-Depth Information
The numerical values of the economic and investment parameters in Table 7.6 are
just estimates having a right order of magnitude. The investment cost correlations
in confidential use in industry are more refined than ours. The parameter values in
real design cases will vary, depending on market conditions and location.
The economic and ecological performances are presented for two different CO
conversion levels (base case,
= 54.0% per pass). Also
the technological constraint on water content is considered. All model parameters
other than the degree of CO conversion and the fuel production capacity are kept
constant. The results obtained by solving the process and economic models are given
in Table 7.7.
η
= 50.0%; enhanced case,
η
TABLE 7.6 Data for economic parameters
Parameter
Value
Parameter
Value
ccf
(year
−1
)
year
−1
)
0.20
t
prod
(h
8000
1.00
kmol
−1
184
MW
C
4+
kg
p
C
4+
,
mass
$kg
−1
C
4+
184
1.00
p
C
4+
=
p
C
4+
,
mass
MW
C
4+
$ kmol
−1
C
4+
c
syngas
$ kmol
−1
syngas
5.00
0.500
p
offgas
$ kmol
−1
C
1−3
c
CO
2
$ kmol
−1
CO
2
0.0200
η
nom
(
−
)
0.500
p
H
2
O
$ kmol
−1
H
2
O
300
λ
nom
(
−
)
1.00
conð Þ
nom
MðÞ
I
ðÞ
nom
MðÞ
sep
200
φ
ðÞ
8.00
nom
kmols
−1
ð
Þ
I
I
mið Þ
50
q
(−)
0.600
nom
MðÞ
Note that a cost penalty for CO
2
emissions is included.
∗
conv., sep., mixer.
TABLE 7.7 Performance results for a FT conversion process
Economy
Investments
(10
6
US $)
Contributions to
EP
3
($ h
−1
)
η
= 50.0%
η
= 54.0%
η
= 50.0%
η
= 54.0%
I
(conv)
P
products
35,539
35,405
251
231
I
(sep)
C
feed
9,199
9,075
142
135
I
(mix)
C
CO
2
61.7
61.7
41.9
40.5
C
cap,h
10,884
10,195
I
cap
435
407
EP
3
15,393
16,072
Ann. Cap. Cost
87.1
81.6
Ecology
Technological constraint:
Carbon atom
efficiency
0.759
0.770
Water fraction in
stream 3
0.201
0.217
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