41
BAB IV HASIL DAN PEMBAHASAN
4.1 Perhitungan Mesin Pembangkit Listrik Tenaga Gas dan Uap PT. Indonesia
Power Unit Pembangkitan Semarang
Uraian satuan
GTG 1.2 GTG 1.3
GT Gen load MW
70 70
Air Inlet Temp
1
T
C
29 30
Comp. Disch Temp
2
T C
332 321
Exhaust Temp
4
T C
553 560
Tekanan udara luar
1
P
Bar 1.013
1.013 Comp. Disch Press
gage 2
P Bar
8.38 7.92
gage 2
1 2
P P
P +
= Bar
9,393 8,933
Fuel flow mf s
kg 5.12
3.63 HV
kg KJ
54610.44 54610.44
Data Output Data Output diperoleh melalui proses perhitungan, dimana data ini meliputi antara lain :
a Temperatur udara tekan ideal
T
s 2
K 40
, 570
T K
302 T
T T
s 2
013 ,
1 393
, 9
s 2
P P
1 s
2
004 ,
1 1
004 ,
1 k
1 -
k 1
2
= ×
= ×
=
b Temperatur Ruang Bakar
T
3
[ ]
kg KJ
3 Kg
KJ Kg
KJ Kg
KJ 3
2 2
3 3
3 Kg
KJ Kg
KJ Kg
KJ 2
3 s
kg s
kg s
kg f
a g
s KJ
bakar bahan
kg KJ
s kg
bakar bahan
f bakar
bahan 3
013 ,
1 393
, 9
3 P
P 4
3
591 ,
629 h
K 1,68715
302K -
K 04
, 570
K 1,044
- K
97 ,
1439 K
205 ,
1 h
s Δ
T -
T t
cp -
T t
cp h
K 68715
, 1
s Δ
K 1,70868
- K
39583 ,
3 s
Δ s
- s
s Δ
35 ,
215 g
m 12
, 5
23 ,
210 g
m m
m m
4272 ,
279605 Q
54610,44 12
, 5
Q HV
m Q
K 97
, 1439
T K
826 T
T T
1,004 1
- 004
, 1
k 1
- k
1 2
= •
× ×
• ×
• =
× ×
× =
• =
• •
= =
= +
= +
= =
× =
× =
= ×
= ×
=
c Temperatur gas buang ideal
T
s 4
K 40
, 762
T K
97 ,
1439 T
T T
s 4
393 ,
9 013
, 1
s 4
P P
3 s
4
004 ,
1 1
- 004
, 1
k 1
- k
2 1
= =
=
d Laju Aliran udara
m
a
s kg
a kg
KJ kg
KJ a
GT a
23 ,
210 m
302K] K
1,005 -
K 605
K 052
, 1
[ KW
70000 m
T1] cpt1
- 2
T 2
cpt [
W m
= ×
• ×
• =
× ×
=
e Efisiensi Kompresor
η
kompresor
6 ,
93 η
K 302
K 005
, 1
23 ,
210 KW
70000 K
04 ,
570 K
044 ,
1 23
, 210
η T
t cp
m W
T t
cp m
η
kom presor Kg
KJ s
kg Kg
KJ s
kg kom presor
1 1
a GT
2 2
a Kom presor
= ×
• ×
+ ×
• ×
= ×
× +
× ×
=
f Efisiensi Ruang Bakar
η
ruangbakar
5 ,
33 η
23 ,
210 K
04 ,
570 K
044 ,
1 KW
4272 ,
279605 35
, 215
591 ,
629 η
m T
t Cp
Q m
h η
cc s
kg kg
KJ s
kg kg
KJ cc
a 2
2 bakarl
bahan g
3 cc
= ×
× •
+ ×
= ×
× +
× =
• •
•
g Efisiensi Turbin Gas
η
TurbinGas
63 ,
66 η
K 97
, 1439
K 205
, 1
23 ,
215 K
826 K
10472 ,
1 23
, 215
KW 70000
η T
t cp
m T
t cp
m W
η
t kg
KJ s
kg kg
KJ s
kg t
3 3
g 4
4 g
GT t
= ×
• ×
× •
× +
= ×
× ×
× +
=
h Efisiensi Gas Turbin Generator
η
GTG
04 ,
25 η
KW 4272
, 279605
KW 70000
η Q
W η
GTG GTG
Bakar bahan
GT GTG
= =
=
•
Uraian satuan
HRSG 1.2 HRSG1.3
PressTemp LP Economizer BarC
17.128 16 152
Flow LP Economizer kgh
175000 165000
PressTemp LP Drum BarC
6.5 128 6.4 152
PressTemp LP Superheat BarC
6 302 6.1 305
Flow LP Superheat kgh
19000 31000
PressTemp HP Economizer BarC
121 168 122
Flow HP Economizer kgh
119500 119000
PressTemp HP Drum BarC
22 269 53 267
PressTemp HP superheat BarC
52 514 53 515
Flow HP Superheat kgh
127000 110000
Arus Motor HP Xfer Pump Amp
71 70
Data Output Data Output diperoleh melalui proses perhitungan, dimana data ini meliputi antara lain :
a Efisiensi HRSG
[ ]
78 ,
72 η
215,23 405K
K 1,0137
- 23
, 215
K 40
, 762
K 089975
, 1
56 ,
40 89
, 683
982,8W 28
, 35
33 ,
810 1341,9W
- 17
, 3464
28 ,
35 93
, 2862
28 ,
5 η
m T
t cp
- m
T t
cp ]
m h
W m
h [W
- h
m h
m η
HRSG s
kg kg
KJ s
kg kg
KJ s
kg kg
KJ s
kg kg
KJ kg
KJ s
kg kg
KJ s
kg HRSG
g HRSG
keluar keluarHRSG
g 4
4 Hp
Hp transfer
hp pom pa
Lp Lp
kondensat pom pa
SH HP
HP SH
LP LP
HRSG
= ×
× •
× ×
• ×
+ +
× +
× +
× =
× ×
× ×
× +
+ ×
+ ×
+ ×
=
• •
• •
•
b Efisiensi Pompa HP Transfer
31 ,
98 η
89 ,
683 56
, 40
W 9
, 1341
33 ,
810 28
, 35
η h
m W
h m
η
Pum p Transfer
HP kg
KJ s
kg kg
KJ s
kg Pum p
Transfer HP
LP LP
Pom pa HP
HP Pum p
Transfer HP
= ×
+ ×
= ×
+ ×
=
• •
Uraian Satuan
STG 1.0 ST Gen Load
MW 65
Press IPC AB BarBar
50 Temp IPC AB
CC 516
Press APC Bar
6 Temp APC
C 300
Vacum Press mm HG
42 Press Disch Cond. Pump
Bar 18.6
Temp Disch Cond. Pump C
38 Flow Disch Cond. Pump
kgh 402700
Arus Motor Cond. Pump Amp
52 Data Output Data Output diperoleh melalui proses perhitungan, dimana data ini meliputi
antara lain :
a Efisiensi turbin uap
KW 78
, 232855
Q 797
, 2564
76 ,
90 Q
h m
Q KW
38 ,
277962 W
63 ,
3061 79
, 90
W h
m W
KW 17
, 266923
W 03
, 3471
90 ,
76 W
h m
W 79
, 90
m 89
, 13
90 ,
76 m
m m
m
kondensor kg
KJ s
kg kondensor
kondensor total
Kondensor LP
kg KJ
s kg
LP LP
total LP
HP kg
KJ s
kg HP
HP HP
HP s
kg total
s kg
s kg
total LP
HP total
= ×
= ×
= =
× =
× =
= ×
= ×
= =
+ =
+ =
66 ,
54 η
KW 65000
KW 78
, 232855
KW 38
, 277962
KW 17
, 266923
η W
Q W
W η
ST ST
st Kondensor
LP HP
ST
= +
+ =
+ +
=
b Efisiensi kondensor
67 ,
5 η
797 ,
2564 79
, 90
51 ,
145 79
, 90
η h
m h
m η
kondensor kg
KJ s
kg kg
KJ s
kg kondensor
kondensor g
total kondensor
f total
kondensor
= ×
× =
× ×
=
c Efisiensi pompa kondensat