b. Menghitung Panas Masuk 1 Panas Alur 22
CH
4
: Qi
CH4
= N
22 CH4
.
303 298
4
dT Cpg
CH
= 20,0320 kmoljam x 255,2257 Jmol = 5.112,6799 kJjam
C
2
H
6
: Qi
C2H6
= N
22 C2H6
.
303 298
6 2
dT Cpg
H C
= 1,6693 kmoljam x 265,8178 Jmol = 443,7384 kJjam
C
3
H
8
: Qi
C3H8
= N
22 C3H8
.
303 298
8 3
dT Cpg
H C
= 0,2782 kmoljam x 370,2066 Jmol = 102,9997 kJjam
C
4
H
10
: Qi
C4H10
= N
22 C4H10
.
303 298
1 0 4
dT Cpg
H C
= 0,2782 kmoljam x 490,6778 Jmol = 136,5174 kJjam
2 Panas Alur 23
O
2
: Qi
O2
= N
23 O2
.
303 298
2
dT Cpg
O
= 33,1867 kmoljam x 147,2875 Jmol = 12.120,7192 kJjam
N
2
: Qi
N2
= N
23 N2
.
303 298
2
dT Cpg
N
= 309,5781 kmoljam x 167,6749 Jmol = 51.908,4869 kJjam
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c. Menghitung Panas Keluar 1 Panas Alur 24
O
2
: Qo
O2
= N
24 O2
.
O
T O
dT Cpg
298
2
= 33,1867 kmoljam .
O
T O
dT Cpg
298
2
N
2
: Qo
N2
= N
24 N2
.
O
T N
dT Cpg
298
2
= 309,5781 kmoljam .
O
T N
dT Cpg
298
2
CO
2
: Qo
CO2
= N
24 CO2
.
O
T CO
dT Cpg
298
2
= 25,3182 kmoljam .
O
T CO
dT Cpg
298
2
H
2
O : Tekanan di alur 24 sebesar 1 atm = 101,325 kPa Titik didih air = 373 K
∆H
VL373
= 2257,3 kJkg Reklaitis, 1983 = 2257,3 kJkg x 18,016 kgkmol
= 40667,5168 Qo
H2O
= N
24 H2O
.
O
T O
H
dT Cp
298
2
= 47,5760 x
dT Cpv
H dT
Cpl
O
T O
H VL
O H
373 373
298
2 2
Asumsi tidak ada panas yang hilang selama pembakaran, sehingga dQdt = 0 dQdt =
C Hr
r
i i
i 4
4
30
+ Qo
– Qi = -19.682.442,6006 kJjam + Qo
– 69.825,1415 kJjam Qo = 19.752.267,7422 kJjam
Qo = N
24 O2
.
O
T O
dT Cpg
298
2
+ N
24 N2
.
O
T N
dT Cpg
298
2
+ N
24 CO2
.
O
T CO
dT Cpg
298
2
UNIVERSITAS SUMATERA UTARA
+ N
24 SO2
.
o
T SO
dT Cpg
298
2
+ N
24 H2O
.
O
T O
H
dT Cp
298
2
= 33,1867.
O
T O
dT Cpg
298
2
+ 309,5781 .
O
T N
dT Cpg
298
2
+ 25,3182.
O
T CO
dT Cpg
298
2
+ 47,5760.
dT Cpv
H dT
Cpl
O
T O
H VL
O H
373 373
298
2 2
Dengan menggunakan Metode Newton-Rapshon pada program Matlab diperoleh suhu To = 1135,6570 = 1136 K = 863
C
UNIVERSITAS SUMATERA UTARA
Maka, O
2
: Qi
O2
= N
24 O2
.
1136 298
2
dT Cpg
O
= 33,1867 kmoljam x 27.494,7093 Jmol = 912.458,6299 kJjam
N
2
: Qi
N2
= N
24 N2
.
1136 298
2
dT Cpg
N
= 309,5781 kmoljam x 49.501,7634 Jmol = 15.324.661,3469 kJjam
CO
2
: Qi
CO2
= N
24 CO2
.
1136 298
2
dT Cpg
CO
= 25,3182 kmoljam x 40.858,0236 Jmol = 1.034.452,2923 kJjam
H
2
O : Qi
H2O
= N
24 H2O
.
1136 298
2
dT Cp
O H
= 47,5760 kmoljam x
dT Cpv
H dT
Cpl
O H
VL O
H 1136
373 373
298
2 2
= 47,5760 x 52.141,7527 Jmol = 2.480.695,4730 kJjam
Tabel B.7 Neraca Energi pada Burner B-101
Komponen Masuk kJjam
Keluar kJjam H
22
H
23
H
24
CH
4
5.112,6799 -
- C
2
H
6
443,7384 -
- C
3
H
8
102,9997 -
- C
4
H
10
136,5174 -
- O
2
- 12.120,7192
912.458,6299 N
2
- 51.908,4869
15.324.661,3469
UNIVERSITAS SUMATERA UTARA
Tabel B. 7 Neraca Energi...... Lanjutan CO
2
- -
1.034.452,2923 H
2
O -
- 2.480.695,4730
Jumlah 5.795.9355
64.029,2061 19.752.267,7422
Sub Total
69.825.1415 19.752.267,7422
∆Hr 19.682.442.6006
- Q
- -
Total 19.752.267.7422
19.752.267,7422
B.2.4 Rotary Kiln Pre-Heater B-102
Fungsi: Pemanas awal bahan baku sampai suhu 617 C, sebelum dikirim ke Electric
Furnace B-103
c. Menghitung Panas Masuk 1 Panas Alur 21
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