Biomedical Engineering Reference
In-Depth Information
Energy required for evaporation of the 30% moisture (Example 4.4) in bio-
mass in dryer section is calculated using
Eq. (4.19)
:
Q
dry
8kW
Energy required for heating 0.396 kg dried biomass (Example 4.4) to 280
C
is calculated using
Eq. (4.19)
:
Q
pd
5
ð
0
:
566
0
:
3
Þ
3
2260
383
:
3
5
0
:
396
0
:
269
3
ð
280
100
Þ
5
19
:
2kW
5
3
Total load
66.1
414.6
19.2
469.0 kW
5
1
1
5
So, Q
total
469 kW
5
Burner Design
Given:
300
C, T
t
5
280
C, T
g0
5
105
C, T
0
5
20
C
T
gi
5
Theoretical (A/F) ratio
14.6
5
Burner efficiency,
η
5
0.95; LHV
oil
5
45,500 kJ/kg
The amount of flue gas, W
g
, fed into the torrefier is calculated using
Eq. (A.5)
of Appendix:
A
C
g
ð
T
gi
2
T
g0
Þ
W
g
5
A
5
ð
W
v
C
v
1
W
vl
C
g
Þ
T
g0
1
W
t
C
d
T
t
2
W
f
C
b
T
0
1
W
v
L
We use the data given below for calculation:
300
C
280
C
105
C
T
gi
5
;
T
t
5
;
T
g0
5
;
L
5
2260 kJ
=
kg
Values calculated in Example 4.4 are as follows:
W
t
5
0.277 kg/s
W
v
5
0.170 kg/s
W
vl
5
0.119 kg/s
W
f
5
0.566 kg/s
A
(0.17
1.89
0.119
1.13)
105
0.277
0.269
280
0.567
5
3
1
3
3
1
3
3
1.46
20
0.17
2260
436.4 kg/s
3
3
1
3
5
A
436
:
4
W
g
5
1
:
98 kg
=
s
T
g0
Þ
5
Þ
5
C
g
ð
T
gi
2
1
:
13
ð
300
105
2
W
0
g
5
W
f
1
W
g
W
t
5
0
:
566
1
1
:
98
0
:
277
5
2
:
27 kg
=
s
To find oil consumption, we use
Eq. (A.7)
of Appendix:
1
K
2
P
3
W
g
W
0
g
C
g
T
gi
C
g
T
g0
1
W
oil
5
VL
0
fr
LHV
vl
η
2
1
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