Environmental Engineering Reference
In-Depth Information
and 3. They are assumed to be constant and perfectly known. The data are assumed
to reasonably represent a steady-state operating regime of the plant. The thermal
losses are neglected.
Stream 1
Stream 2
Mixer-heat
exchanger
Heating
power
Electro
refinery
Cleaning
Stream 3
Figure 2.8
Mixer-exchanger for conditioning an electrolyte
Tabl e 2. 3
Data for the plant of Figure 2.8
O
C
m
3
Va r i a b l e T
(
)
F
(
/
min
)
ρ
(
kg
/
l
)
c
(
gCu
/
l
)
n
(
gNi
/
l
)
X
X
X
X
X
Stream
Y
σ
Y
σ
Y
σ
Y
σ
Y
σ
1
46
2
45.3
20
4
20.4
1.31
0.12
1.25
40
3
41.1
10
2.0
10.1
2
27
2
26.7
9.6
1.15
0.06
1.15
10
2
10.2
1
0.3
1.0
3
42
3
42.1
27.2
1.28
0.12
1.34
37
4
34.4
8
2.0
7.9
500;
X
Power data (kJ/s)
P
:
Y
=
6000;σ
=
=
5978
The mass balance constraints around the mixer-exchanger are written as
⎧
⎨
F
1
ρ
1
+
F
2
ρ
2
−
F
3
ρ
3
=
0
F
1
c
1
+
F
2
c
2
−
F
3
c
3
=
0
(2.92)
⎩
F
1
n
1
+
F
2
n
2
−
F
3
n
3
=
0
and the heat balance as
F
1
ρ
1
C
1
T
1
+
F
2
ρ
2
C
2
T
2
−
F
3
ρ
3
C
3
T
3
+
P
=
0
(2.93)
The least-squares criterion is
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