49
Leak air (approx. 5% of inlet air )
m
la
= m
ha
· 0.05
m
la
=
1995.239532
lb/h
50
51
B
C
D
E
F
G
H
I
J
52
Heat from ambient air
Q
a
= m
ha
· h
3
a
Q
a
=
344885.1341
Btu/h
53
54
Heat from fuel
Q
f
= m
f
· T
f
· cp
f
Q
f
=
39461.72314
Btu/h
55
56
Heat from combustion
Q
comb
. = m
f
· NCVF
Q
comb.
=
9505883.79
Btu/h
57
58
Total amount of heat in furnance
Q
Fin
= Q
a
+ Q
f
+ Q
comb.
Q
Fin
=
9890230.647
Btu/h
59
60
FUEL BURNING
61
The fuel used is mixture of light and medium light fuel oil composition 87%C i 11%H
62
The amount of oxigen and air can be calculated as follows:
63
64
m(O
2
) = 0.01 · (2.667·C+8·H) = 0.01·(2.667·87+8·11)
mO
2
=
6.614
lb
65
m
AIR
= 0.115·C + 0.345·H = 0.115·87+0.345·11
m
AIR
=
28.66
lb
66
1,3 coefficient of air surplus
67
m
AIR
= 1,3 · 13,79 = 17,927 kg
air
/ kg
fuel
68
m(N
2
) = 0.786 · mAIR = 0.786 · 17.927 = 13.76 kg N
2
/ kg fuel
69
Air for combustion of 1lb fuel
17.927
lb
70
71
Total amount air for combustion
m(air
comb.
) = m
f
· m
AIR
m(air
comb.)
=
9620.831614
lb
72
73
TOTAL AMOUNT HEAT FROM FURNANCE
74
Heat from hot air
Q
ha
= [m
ha
- m(air
comb
)] · h
1
a
Q
ha
=
6039796.449
Btu/h
75
76
Heat from water in combustion
Q(H
2
0) = m
f
· m(H
2
O) · h
1
(H
2
O)
Q(H
2
O) =
806691
Btu/h
77
burning of 1 kg of fuel 1,035 kg water is produced
78
79
Heat from nitrogen
Q(N
2
) = m
f
· m(N
2
)
· cp(N
2
)
· T
in
Q(N
2
) =
1278172
Btu/h
80
burning of 1 kg fuel 10,65 kg nitrogen is produced
81
82
Heat from CO
2
Q(CO
2
) = m
f
· m(CO
2
)
· cp(CO
2
)
+ Tin
Q(CO
2
) =
398424
Btu/h
83
burning of 1 kg fuel 3,11 kg CO2 is produced
84
85
Total heat from furance
QF
out
= Q
ha
+Q(H
2
O)+Q(N
2
)+Q(CO
2
)
Q
Fout
=
8523083.417
Btu/h
86
87
Furnace losses
Q
FL
= Q
Fin
- QF
out
Q
FL
=
1367147.23
Btu/h
88
89
HEAT ENTERNIG IN TOWER (Qt) [kJ/h]
90
Heat from furance
Q
F
=
8523083
Btu/h
91
Heat from slurrry
Q
sl
= m
wm
· cp
S
· T
S
Q
sl
=
978895
Btu/h
92
Heat from leak air
Q
LA
= Qa · h
3
a
Q
LA
=
17244
Btu/h
93
Total amount heat in tower
Qt
in
= QF
out
+ Q
sl
+ Q
la
Qt
in
=
9519223
Btu/h
94
95
HEAT LEAVING TOWER (Qout) [kJ/h]
96
Heat from exhaust air
Qa
out
= (m
ha
+m
la
) · h
2
a
Qa
out
=
1986815.631
Btu/h
97
Heat from evaporated water
Qew
out
= [m
ev
+(m(H
2
0) · m
f
)] · h
2
w
Qew
out
=
7179178.119
Btu/h
98
Heat from N
2
Q(N
2
)
out
= mf · m(N
2
)
· cp(N
2
)
· T
out
Q(N
2
)
out
=
349144.3442
Btu/h
99
Heat from CO
2
Q(CO
2
)
out
= m
f
· m(CO
2
)
·cp(CO
2
)
·T
out
Q(CO
2
)
out
=
108833.2816
Btu/h
100
Heat from dried material
Q
dm
= m
dm
· cp
dm
· T
dm
Q
dm
=
294461.5557
Btu/h
101
102
Total amount heat from tower
103
Q
out
= Qa
out
+ Qew
out
+ Q(N
2
)
out
+ Q(CO
2
)
out
+ Q
dm
Q
out
=
9918432.932
Btu/h
104
