SESSION 3 GAS-TURBINE POWER PLANT€¦ · menyebabkan combustion liner ... Tipe Combustor • Can...
Transcript of SESSION 3 GAS-TURBINE POWER PLANT€¦ · menyebabkan combustion liner ... Tipe Combustor • Can...
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SESSION 3SESSION 3GASGAS--TURBINE TURBINE POWER PLANTPOWER PLANT
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OutlineOutline
1.1. DasarDasar TeoriTeori TurbinTurbin GasGas2.2. ProsesProses PLTG PLTG dandan PLTGUPLTGU3.3. KlasifikasiKlasifikasi TurbinTurbin GasGas4.4. KomponenKomponen PLTGPLTG5.5. KelebihanKelebihan dandan KekuranganKekurangan
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1. 1. DasarDasar TeoriTeori TurbinTurbin GasGas
TurbinTurbin gas gas bekerjabekerja atasatas dasardasar siklussiklusBraytonBrayton yang yang merupakanmerupakan suatusuatu standarstandarsiklussiklus udaraudara..
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Proses 1-2 Kompresi Isentropik (pada kompresor)
Proses 2-3 P = konstan, Penambahan Panas
Proses 4-1 P = konstan, Pembuangan Panas
Proses 3-4 Ekspansi Isentropik (pada Turbin)
pressure ratio, rp = P1/P2
V
P
1
win
v2
Pv k= c
v1
2
v4
Pv k= c
4
wout
qout
P1= P4
v3
3
qin
P2= P3
s
T
qout
P = const. = P1
3
P = const. = P 2
qin
2
s1=s2
1
s3=s4
4
SiklusSiklus BraytonBrayton
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• Q1-2 = Energi masuk(Conditions 1 – 2)
• Q4-1 = Energi keluar(Condition 4 – 1)
• V2/V1 = Rasio kompresi• k = Specific Heat Ratio = 1,3 – 1,4 (udara)
1 2 4 11
1 2 2 1
11( / )k
Q QQ V V
EfisiensiEfisiensi SiklusSiklus BraytonBrayton
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PenjelasanPenjelasan SiklusSiklus BraytonBrayton
PemampatanPemampatan (compression) (compression) udaraudara dihisapdihisap dandandimampatkandimampatkan
PembakaranPembakaran (combustion) (combustion) bahanbahan bakarbakardicampurkandicampurkan keke dalamdalam ruangruang bakarbakar dengandengan udaraudarakemudiankemudian dibakardibakar
PemuaianPemuaian (expansion) (expansion) gas gas hasilhasil pembakaranpembakaranmemuaimemuai dandan mengalirmengalir keke luarluar melaluimelalui nozzlenozzle
PembuanganPembuangan gas (exhaust) gas (exhaust) gas gas hasilhasil pembakaranpembakarandikeluarkandikeluarkan lewatlewat saluransaluran pembuanganpembuangan
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PrinsipPrinsip TurbinTurbin Gas Gas RegeneratifRegeneratif
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2. PROSES PLTG
TurbineCompressor
CombustionChamberFuel
Air Intake Exhaust Gases
Compressed Air Combustion Gases
Electric
Generator
Electric Power Output
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Pumping
houseFuel
pump
Gas
line
ElectricPower diesel
Air filter
compressorstack
Combustionsystem
Gas Turbine
Generator
Main
transformer
Switch
yard
Transmission
line
ProsesProses PLTGPLTG
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El
1. Gas pressure regulator
2. Gas accumulator
3. Deaerator
4. Economizer
GFC; gas fuel compressor
HRSG; Heat Recovery Steam and Gas
PGN
GFC 2
HRSG
3
GGT
1
air
1
water
Steamchimney chimney
by pass main
4
Proses PLTG
Filter
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ProsesProses PLTGUPLTGU
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Proses PLTGU
AIR INLETFILTERAIR INLETFILTER
GASTURBINEGASTURBINE
EXHAUSTBYPASSSILENCER
EXHAUSTBYPASSSILENCER
GENERATORGENERATOR
DIVERTERVALVEDIVERTERVALVE
SUPPLE-MENTARYBURNER
SUPPLE-MENTARYBURNER
HEATRECOVERYSTEAMGENERATOR(HRSG)
HEATRECOVERYSTEAMGENERATOR(HRSG)
EXHAUSTSILENCEREXHAUSTSILENCER
PROCESSSTEAMPROCESSSTEAM
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ProsesProses PLTGUPLTGU
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EfisiensiEfisiensi TermalTermal PLTGU & PLTGPLTGU & PLTG
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3. KLASIFIKASI TURBIN GAS3. KLASIFIKASI TURBIN GAS
BerdasarkanBerdasarkan SiklusnyaSiklusnya TurbinTurbin gas gas siklussiklus tertutuptertutup (Close Cycle)(Close Cycle) TurbinTurbin gas gas siklussiklus terbukaterbuka (Open Cycle)(Open Cycle)
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BerdasarkanBerdasarkan SiklusSiklus
High Pressure Air
Compressor
Heat ExchangerQin
High Temp.Air
Turbine
Heat Exchanger
Qout
Wnet
TurbineCompressor
CombustionChamberFuel
Air IntakeExhaust Gases
Compressed Air Combustion Gases
Open cycleOpen cycle Closed CycleClosed Cycle
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BerdasarkanBerdasarkan KonstruksiKonstruksi PorosPoros TurbinTurbin gas gas porosporos tunggaltunggal (Single Shaft)(Single Shaft) TurbinTurbin gas gas porosporos gandaganda (Double Shaft)(Double Shaft)
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BerdasarkanBerdasarkan KonstruksiKonstruksi PorosPoros
Single Shaft
Double Shaft
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Berdasarkan Aplikasi
• Industrial heavy-duty gas turbines
• Aircraft-derivative gas turbines
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Industrial Heavy-duty Gas Turbines
• Daya keluaran yang besar• Berumur panjang• Memiliki efisiensi paling tinggi
dibanding tipe gas turbin lain• Tidak berisik dibandingkan
dengan Aircraft-derivative gas turbine
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Aircraft-derivative gas turbines
• Paling banyak digunakan pada Power Plant• Biaya instalasi yang relatif murah• Peralatan start-up membutuhkan daya yang kecil• Proses start-up dan shut-down dapat dilakukan dengan cepat• Dapat meng-handle fluktuasi perubahan beban
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Berdasarkan Kapasitas
Medium-range gas turbines
Small gas turbines
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Medium-range gas turbines
• Kapasitas berkisar antara 5000 – 15000 hp (3,7 – 11,2 MW).
• Memiliki efisiensi yang cukup tinggi.• Pada kompresor terdapat 10-16 tingkat sudu, dengan
rasio tekanan sekitar 5-11.• Biasanya menggunakan regenerator untuk
meningkatkan efisiensi
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Small gas turbines
• Biasanya menggunakan kompresor sentrifugal• Kapasitas di bawah 500 hp (3,7 MW)• Memiliki efisiensi sekitar 20 %, karena:
– Efisiensi kompresor sentrifugal yang digunakan memiliki efisiensilebih rendah dibanding kompresor aksial
– Temperatur masuk pada turbin diusahakan tidak melebihi1700oF (927oC)
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4. KOMPONEN PLTG4. KOMPONEN PLTG
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KomponenKomponen UtamaUtama
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Air Inlet SectionAir Inlet Section
Air Inlet HousingAir Inlet Housing Inertia SeparatorInertia Separator PrePre--FilterFilter Main FilterMain Filter Inlet Inlet BellmouthBellmouth Inlet Guide VaneInlet Guide Vane
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Compressor SectionCompressor Section
Compressor Rotor AssemblyCompressor Rotor Assembly
Compressor StatorCompressor Stator Inlet CasingInlet Casing Forward Compressor CasingForward Compressor Casing Aft CasingAft Casing Discharge CasingDischarge Casing
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CompressorsCompressors
•• Centrifugal CompressorCentrifugal Compressor
•• Axial Flow CompressorAxial Flow Compressor
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Centrifugal CompressorCentrifugal Compressor
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Axial CompressorAxial Compressor
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Combustion SectionCombustion Section
Combustion ChamberCombustion Chamber Combustion LinersCombustion Liners Fuel NozzleFuel Nozzle IgnitorsIgnitors (Spark Plug)(Spark Plug)
Transition PiecesTransition Pieces Cross Fired TubesCross Fired Tubes Flame DetectorFlame Detector
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Zona pembakaran padacombustion chamber ada 3, yaitu:
• Primary zone• Secondary zone• Dilution zone
Gradien temperatur, deposit karbon, dan asap harusdiminimalisir, karena:
• Gradien temperatur dapatmenyebabkan combustion liner membengkok dan retak
• Deposit karbon meningkatkan pressure loss dan mengacaukan pola aliran
• Asap pencemaran lingkungan
Combustion ChamberCombustion Chamber
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TipeTipe CombustorCombustor
•• CanCan
•• AnnularAnnular
•• CanCan--annularannular
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Turbine SectionTurbine Section
Turbine Rotor CaseTurbine Rotor Case First Stage NozzleFirst Stage Nozzle First Stage Turbine WheelFirst Stage Turbine Wheel Second Stage Nozzle and Second Stage Nozzle and DiafragmaDiafragma Second Stage Turbine WheelSecond Stage Turbine Wheel
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Turbine Blade CoolingTurbine Blade Cooling1.1. Convection coolingConvection cooling2.2. Impingement coolingImpingement cooling3.3. Film coolingFilm cooling4.4. Transpiration coolingTranspiration cooling5.5. Water coolingWater cooling
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Axial Flow TurbineAxial Flow TurbineImpuls, umum untuk menghadapi tekanan sangat tinggi (stage awal steam)
Reaksi, umum untuk menghadapi tekanan sedang (gas turbine)
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Heat Recovery Steam GeneratorsHeat Recovery Steam Generators
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KomponenKomponen PenunjangPenunjang Starting Equipment Starting Equipment untukuntuk melakukanmelakukan start up start up
sebelumsebelum turbinturbin bekerjabekerja Coupling and Accessory Gear Coupling and Accessory Gear untukuntuk memindahkanmemindahkan
dayadaya & & putaranputaran daridari porosporos yang yang bergerakbergerak keke porosporos yang yang akanakan digerakkandigerakkan
Lube Oil System Lube Oil System untukuntuk melakukanmelakukan pelumasanpelumasan secarasecarakontinyukontinyu padapada setiapsetiap komponenkomponen sistemsistem turbinturbin gasgas
Cooling System Cooling System sistemsistem pendinginpendingin yang yang digunakandigunakanpadapada turbinturbin gas gas adalahadalah air air dandan udaraudara
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5. KEUNTUNGAN DAN KERUGIAN5. KEUNTUNGAN DAN KERUGIAN
Keuntungan dan Kerugian PLTG
Keuntungan dan Kerugian PLTGU
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KelebihanKelebihan dandan KekuranganKekurangan PLTGPLTG
KelebihanKelebihan::•• ProsesProses instalasiinstalasi yang yang mudahmudah dandan murahmurah•• StartStart--up time yang up time yang cepatcepat•• TenagaTenaga daruratdarurat (back(back--up)up)•• DapatDapat menggunakanmenggunakan berbagaiberbagai macammacam variasivariasi bahanbahan bakarbakar•• Ramah Ramah lingkunganlingkungan
KekuranganKekurangan::•• SingleSingle--cycle cycle memilikimemiliki efisiensiefisiensi yang yang rendahrendah
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Keuntungan:• Gas panas keluaran dari turbin gas dapat digunakan untuk
memanaskan air sehingga menjadi uap untuk menggerakkan turbinuap
• Meningkatkan efisiensi menjadi sebesar 40-50%• Efisiensi bahan bakar
Kerugian:• Peningkatan biaya• Peningkatan luas area yang dibutuhkan
Kelebihan dan Kekurangan PLTGU