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ReportDocID: DAAB525315 Title: Evaluation of ORC/steam turbine cycle
and ? with KTH Revision: -.3
Created by: Anders Ahnger / 16-Nov-2005 Status: Draft
Draft by: Anders Ahnger / 16-Nov-2005 Pages: 1 (1)
Power Plants Project: IN023 - WFI-P PPTECH
Description:
Projekt for KTH studenter 1) Organic Rankin Cycle (ORC) för gas motordrivna kraftvärmeanläggningar Bakgrund: Wärtsilä levererar idag ca. 50 gasmotordrivna kraftverk per år. Gas motorerna som
används är Wärtsilä 20V34SG på 8,7 MWe eleffekt eller Wärtsilä 18V50DF på 16,6 MWe eleffekt. Antalet motorer per kraftverk varierar i allmänhet mellan 1-6 st. och är beroende på kundens önskemål. För att öka kraftverksinvesteringens lönsamhet och i länder med högt el-pris evalueras ofta möjligheter till tilläggsgenerering av el med att utrusta motorkraftverket med en ångturbincykel, där motorernas avgas- och andra rest-energier utnyttjas. På senare tid har även Organic Rankin Cycle (ORC) tekniken kommit starkt in i bilden och leverantörer av denna teknik påstår att ORC:n är en bättre lösning än den konventionella ångturbincykeln speciellt för mindre kraftverk, typ Wärtsiläs gasmotorer med relativt låga temperaturer på motorns restvärmeflöden.
Frågeställning: Wärtsilä bör veta mera om ORC tekniken, veta i vilka fall den kan användas, när den är konkurrenskraftig gentemot en ångturbincykel och veta i vilka fall denna teknik kan rekommenderas för kunder (ett klart ställningstagande i frågan). Wärtsilä skall även kunna offerera dylik teknik som en del av en kraftverksleverans samt veta vilka relevanta leverantörer finns på marknaden.
Utgångsläge: Som bas för evalueringen tas två olika kraftverkalternativ, a) kraftverk med 2 stycken W20V34SG motorer b) kraftverk med 3 stycken W18V50DF. Tekniska data på motorerna finns på Wärtsiläs Internet sidor. Tekniska data på ångcykeln samt ORC:n måste sökas hos leverantörer för utrustningen. Evalueringen görs så att ORC tekniken jämförs tekniskt och ekonomiskt med den vanliga ångturbincykeln för de två alternativa kraftverken.
Målsättning: Målsättningen för Wärtsilä är att få ett grepp på vilka är de kriterier som bör uppfyllas för att ORC tekniken kan föredras gentemot ångturbincykeln.
Wärtsilä-kontakt: Thomas Stenhede, [email protected], Anders Ahnger,
© Wärtsilä
GasGas EngineEngine & CHP & CHP PlantsPlants
Anders AhngerAnders Ahnger
General General ManagerManagerCombinedCombined HeatHeat & & PowerPower
2© Wärtsilä
The Gas Engines
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3© Wärtsilä
Wärtsilä Gas Engine Portfolio 2004:
Type Output 50Hz Output 60 Hz
SG engines: 12V34SGA 3995 kWe 3821 kWe18V34SGA 5993 kWe 5732 kWe(9R34SGB 3925 kWe 3800 kWe)
16V34SGB 6984 kWe 6752 kWe20V34SGB 8730 kWe 8440 kWe
DF engines: 18V32DF 6080 kWe 5819 kWe18V50DF 16638 kWe 16638 kWe
GD engines 12V32GD 4339 kWe 4282 kWe16V32GD 5808 kWe 5731 kWe18V32GD 6534 kWe 6447 kWe
SG = Spark Ignited, lean-burn (otto principle) & low pressure natural gas engineDF = Pilot Fuel Ignited, lean burn (otto principle) & low pressure natural gas engineGD = Dual Fuel Diesel engine (diesel principle) & high pressure gas
Wärtsilä® 34SG
4© Wärtsilä
SG engine BMEP development
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W25SG
W34SGA
W34SGB450 kW/cyl
400 kW/cyl345 kW/cyl
315 kW/cyl
5© Wärtsilä
SG engine efficiency development
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W25SG
W34SGA
W34SGB
6© Wärtsilä
Wärtsilä 20V34SG Engine Design
Wärtsilä® 34SG
� Based on the new Wärtsilä 32 diesel engine
� Combustion technology same as the well proven 18V34SG
� Reliability and easy maintenance in focus
� Integrated channels for Lubricating Oil and Cooling Water
� On engine built Lubricating oil module ( pumps, heat exchanger, filters etc)
� Designed for modern manufacturing methods
7© Wärtsilä
Wärtsilä 18V34SG & 20V34SG
Main technical data W18V34SGA W20V34SGB
Cylinder bore
Piston stroke
Engine speed
Mean piston speed
Mean effective pressure
Engine output
340 mm
350 mm
720/750 rpm
8.4/8.75 m/s
17.4 bar
5940 / 6210 kW
340 mm
400 mm
720/750 rpm
9.6/10.0 m/s
19.8 bar
8700 / 9000 kW
8© Wärtsilä
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Wärtsilä 18V34SG & 20V34SG
9© Wärtsilä
� ��� ������� � ���� � �� �� � �
�� �� �� � � �� �� � � �� � � �
� Lean Burn Concept
� Ported gas admission
� Air/fuel mixture ignited by a spark plug in the pre-chamber
� Electrically controlled prechambergas duration – W18V34SG
� Mechanically controlled pre-chamber gas duration –W20V34SG
� Electronically controlled gas valves for main gas duration
� Individual and cylinder wise control of combustion
Wärtsilä 18V34SG & 20V34SG
10© Wärtsilä
Prechamber gas admission
���� ��� �� ��������������������������
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Maintenace interval 1000 h (cleaning) Maintenace interval > 4000 hours
11© Wärtsilä
Main gas valve location
W20V34SGBW18V34SGA
12© Wärtsilä
WECS - Engine control system
H:\PDFOL\W34SG\34-9625.PPT - UÅd 21.10.1996 (Updated 10.03.1998 UÅd)
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CAN-bus
Ethernet (&profibus) toext. systems
Main cabinet
IOM in/out module(s)
cylindercontrol modules
Sensorsconnectedto IOMmodule(s)
13© Wärtsilä
Wärtsilä 18V34SG
� ����� ���(��� ���� � �) ���� ��� �� �������
14© Wärtsilä
# $ � ! % & � � � � � % $ �� ' ��' � ( �� ���� � �� ) * � ' � $ � * � + , � - . / � �� ' � � * � ���� � �+ � � 0 � �
Engine compression ratio 12.0:1 High efficiency Low NOx
Heat rate at generator kJ/kWh 8265 8120 8455 8360Electrical efficiency % 43.6 44.3 42.6 43.1NOx ( as NO2) mg/m3
N at 5 % O2, dry 500 500 250 250CO mg/m3N at 5 % O2, dry 750 750 1200 1200THC ( as CH4) mg/m3N at 5 % O2, wet 1500 1500 2500 2500
Engine compression ratio 11.0:1
Heat rate at generator kJ/kWh 8510 8300 8710 8550Electrical efficiency % 42.3 43.4 41.3 42.1NOx ( as NO2) mg/m3N at 5 % O2, dry 500 500 250 250CO mg/m3N at 5 % O2, dry 750 750 1200 1200THC ( as CH4) mg/m3N at 5 % O2, wet 1200 1200 2200 2200
Wärtsilä® 20V34SG
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15© Wärtsilä
Combined Heat & Power, CHP
*�� "���� + ��� � ,�- �� .*+ ,/
� *�������0, ������ ���0� ����� 0���1
16© Wärtsilä
Wärtsiläs CHP plants
2 ���� ����(�����������*+ ,������
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17© Wärtsilä
Performance W18V34SG:
Power output: 6000 kWe
Electrical efficiency: 44%
Power plant for pure power production
Combined Heat & Power, CHP
18© Wärtsilä
Engine heat balance
� Exhaust gas at ~400 °C / 32 -33 %� Jacket water at ~90 °C / 6,6 %� HT charge air at ~100 °C / 4,7 %� Lubrication oil at ~60 °C / 5,1 %� LT charge air at ~40 °C / 3,6 %� Generator cooling at~35 °C / 1,5 %
The Customers requirements & needs - To be checked !
� Steam, hot water, chilled water, thermal oil or desalination?
� Heat load versus el-load ?� What kind of industrial process ? � Existing boilers & equipment ?� Intended running philosophy &
Control Philosophy ?� Pressures, pressure variations ?� Temperatures, temperature
variations ?� Can the engine low grade energy
be used ?� etc.
Energy sources available for heat recovery
The Heat Recovery The Heat Recovery SystemSystem
-- Optimised to the Optimised to the customers process customers process
requirementsrequirements
Combined Heat & Power, CHP
19© Wärtsilä
% $ ��� �
1 �� ���$ * ��
% $ ��� �
� * � + 2 � ��
. * $ � 3 �$ ���
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) # )
� 4
- 2 � �� * � �
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CHP plant for power, steam
Performance: W18V34SG
Power output: 6000 kWe
Electrical efficiency: 43.4%
Steam 9 bar sat: 3.6 ton/h
Hot water 90/50 C: 2350 kWth
Total efficiency: 77%
Combined Heat & Power, CHP
20© Wärtsilä
� � � � � � � �� � � �� ! " # $ ��
# % & ' ! � # $
Electricityoutput
Natural gas input
Charge air second stage
Cooling radiator
Charge airfirst stage
Lube oil
DH-consumers
Central heat
exchanger
CHP, Hot Water generation & District Heating
Combined Heat & Power, CHP
21© Wärtsilä
Optimal heat recovery of a hot water CHP plant
Combined Heat & Power, CHP
22© Wärtsilä
Combined Heat & Power, CHP
Engine Aux. Module with Heat recovery, EAM + CHP module
Wärtsilä 20V34SG
Engine Auxilliary Module(EAM)
CHP Module
23© Wärtsilä
Tri-Generation (CHP)� ���������� �� ������������������ !����� �"��#���������� �!����
�$��� ��� !%��& "��'�!�"���"��()$��* ����������� ��&"$�!!�&* ����+
� �"$��"�!���� ����� ,��-�"��#��(�����$���. "$�!!�&* ����&��#��
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� 0 ���%��& "����1(��&����($��* ������&�����"�$�������(����
� 2��$� � �3��� �&�42�3�5�1���%����"$�!!������"$�!!�&* ����%��& "����)����� ��$��* ����&��#��
� 6 1���%����"$�!!����7����""��&�����89�: ��%��;&�� ��&4��#���<"������ �5<,��;"$�!!���&�� ��&"�#���&1(��&����("�� %������"$�!!�����"$�!!�&* ������������<
� (%�"�!�%%!�"��������&" ���� ����� 6 ��%����)����=����!= 1�����%����
� >�& ���(��$�� �"�!. �����!����)?��&. 3��* ��(),$��� �"� ��"�!. @ �&�"���)��� % ���. �!�"�����"�
� A ���"�"�� %!�/��)�$�%%������������&@ �!!�
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Combined Heat & Power, CHP
24© Wärtsilä
Absorption chiller
Generating set
Boiler
CAC1/jacket water
Lubricating oil
120°C
7°C
12°C
70-80°C
80-100°C
District cooling
District heating
45-55°C
Circulation pump
Primary loop Secondary loop
Optimized for engine and 120°C
Cold water
storage
Typical Tri-generation system for Airports
Always in Wärtsilässcope
Usually in Wärtsilässcope
Often in Wärtsiläs scope
Three Products:
� Electricity and power
� Chilled water or district cooling
� Hot water or district heating
Combined Heat & Power, CHP
25© Wärtsilä
Gas & CHP plants
���1��� � ,���� �������
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26© Wärtsilä
Principle genset dimensions (mm) and weights (tonnes)
Enginetype
A B C D E Engineweight
Gensetweight
W20V34SG 12666 3300 4909 1845 3064 76.4 137.5
W16V34SG 11692 3300 4909 1845 3064 66,5 115,0
Wärtsilä 34SG Gensets
18V34SG 11780 2780 4770 1850 2920 58,0 100,0
Wärtsilä 18V34SG & 20V34SG
27© Wärtsilä
Auxiliary module
Inlet air/ exhaust gas module
Engine genset
20V34SG generator set with auxiliary modules
Wärtsilä® 34SG
28© Wärtsilä
Section
Exhaust gassilencer
Expansionvessel
RuptureDisc
Ventilation unit
Oil wettedcharge air filter
Exhaust gasboiler
Ventilationunit
Space for SCR reactor
Engine-Generator setEngineauxiliarymodule
CHP-module
Charge airsilencer
Radiator
Oxidation catalyst
+ 30000
+12500
±000
+5800
21250
+14700
Type lay out for 2x20V34SG CHP plant
Wärtsilä® 34SG
29© Wärtsilä
Ground floor
+2350
+1600
+000
Station transformer
Switchgear room
Stairhall
Space for heatrecoveryauxiliaries
Gas regulating unit
+000
Engine-Generator set
Ventilation unit
Maintenace watertank
Engine auxilary module
+1190
CHP module
Charge air silencer
Oil wettedcharge air filter
3-way valve
LO tank (clean)
LO tank (dirty)
Tank area
21250
1820
0
Tackle 2 ton
Wärtsilä® 34SG
Type lay out for 2x20V34SG CHP plant
30© Wärtsilä
Wärtsilä CHP plant
2 �� ������ ��- �(�)$%� ��� �*+ ,�����
31© Wärtsilä
Wärtsilä 18V34SG & 20V34SG
9 ������� �(��� �������
32© Wärtsilä
9 ���������(������������0���� �
Full engine output with
� Methane Number of natural gases 55 to 90 (dep. on engineoptim.)
� Ambient air temperature up to 40 oC (sea level)
� Altitude > 2500 m (25°C)
� Gas feeding pressure > 4,5 bar(g)
� Exhaust gas back pressure &air inlet pressure drop up to 7 kPa
Above values can vary according to the engine optimization, compression ratio and gas quality
Gas Engines
33© Wärtsilä
•”Hot & Dry conditions”•Wärtsilä reciprocating engines offer stable output and high performance in hot and dry conditions. No water consumed for plant cooling!
Gas Engines
No water consumption with radiator cooling!
0.8
0.85
0.9
0.95
1
1.05
15 20 25 30 35 40 45
Ambient temperature [C]
Der
atin
g f
acto
r
Industrial Gas turbine
20V34SG(radiator cooling)
Aeroderivate Gas turbine
Source: GE Ger-3567 Ger-3695; Wärtsilä perf
18V50DF(radiator cooling)
Derating due to cooling water temperature.
Derating due to inlet airtemperature starts at 40C
34© Wärtsilä
•High Altitude•Wärtsilä reciprocating engines offer stable output and high performance high altitudes as well.
Gas Engines
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
1.05
1.1
0 500 1000 1500 2000 2500 3000
Altitude [m]
Der
atin
g f
acto
r
Industrial Gas turbine
20V34SG(radiator cooling)
Aeroderivate Gas turbine
Source: Termoflow calculation program; Wärtsilä perf
18V50DF(radiator cooling)
18V32GD(radiator cooling)
35© Wärtsilä
Gas Engines
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
0 5 10 15 20 25 30 35 40
Plant Electrical Power (MW)
Ele
ctri
cal e
ffici
ency
(%)
Source: Alstom product broschure 01; Wärtsilä perf
5 x 20V34SG
Industrial GT
•Part Load Performance•The high part load efficiency of one unit if further improved in multi-unit installations.
36© Wärtsilä
Gas Turbine vs. Gas Engine
Gas turbine and gas engine ageing influence on performance
-6
-5
-4
-3
-2
-1
0
1
2
3
0 10000 20000 30000 40000 50000 60000 70000 80000 90000 Running hours [h]
%
Hea
t rat
e ch
ange
Out
put c
hang
e
Source: GE GER-3965/GER-4208; Wärtsilä
Industrial gas turbine
Wärtsilä gas engine
LM2500
Industrial gas turbine
LM2500
GT Hot sectionoverhaul
GT Hot sectionoverhaul
GT Major overhaul
Gas engineoverhaul
Output will remain
unchangedfor gas engines
37© Wärtsilä
Gas Engines
•Start-up times•Every unit in a reciprocating engine plant has the flexibility to operate in peaking, back-up and reserve power markets, making fast production changes possible.
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8 9 10
Time (min)
Lo
ad (
%)
0
100
200
300
400
500
600
700
800
900
1000
Sp
eed
(rp
m)
Load Speed
Typical start-up procedure with 20V34SG
38© Wärtsilä
Operations & Service
3 ���������0� �� ���2 ������ � ��(�������
�� ����� ��- 0� ������ �0���1
39© Wärtsilä
Service Products
Service Agreements Field Service Workshops Technical Support
Training O&M Systems OEM Parts Upgrades
40© Wärtsilä
Lifecycle cost
Example case:
� 100 MW Power Plant over 15 years
Levelised unit cost split
Fuel cost
O&M cost
Loan repayment
ROE
Interest
Insurance cost
41© Wärtsilä
Service schedules
Job & Service times – 1 x Wärtsilä 34SG / 8000 hours/year
Men Total No. Tot. serviceInterval Description req. time of jobs time
50 Various interval 50h jobs 1 1,50 2 400 3 600,050 Water cleaning of compressor 1 0,38 2 400 900,0500 Take oil Sample (engine) 1 0,75 240 180,0500 Check water quality 1 1,50 240 360,0
1 000 Regrease prelubricating oil pump 1 0,15 120 18,01 000 Cleaning of TC air filters 1 3,00 120 360,01 000 Clean and check the condition of the ignition coil 1 1,50 120 180,01 000 Replace spark plugs 1 1,50 120 180,02 000 Regrease the drive shaft of turning device 1 0,15 60 9,02 000 Change lubricating oil 1 9,00 60 540,02 000 Check valve clearances 1 7,50 60 450,0
: : : : : :
48 000 Check flexible coupling, replace spring packs 2 30,00 2 60,048 000 Check flexible elements of engine foundation 1 3,24 2 6,564 000 Replace piston 1 90,00 1 90,096 000 Replace cylinder head 1 45,00 1 45,096 000 Replace cylinder liners 1 15,00 1 15,0
42© Wärtsilä
Service schedules
Maintenance costs – 1 x Wärtsilä 20V34SG / 8000 hours/year
0100 000200 000300 000400 000500 000600 000700 000800 000900 000
1 000 000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Year
Cost /EuroLabourSpare parts
1
Costs are based upon standard technical specification and are for guidance only
43© Wärtsilä
Service schedules
Maintenance costs – 1 x Wärtsilä 20V34SG / 8000 hours/year
Costs are based upon standard technical specification and are for guidance only
Running Spare part Labour Total Costs Costs /hours costs costs costs per MWh Rh/eng
Year € € € € /MWh €Start up: 0
1 8 000 9 180 36 448 45 627 0,65 5,702 16 000 88 477 96 730 185 207 2,65 23,153 24 000 33 873 41 755 75 628 1,08 9,454 32 000 200 595 95 199 295 793 4,24 36,975 40 000 13 744 39 841 53 585 0,77 6,706 48 000 204 355 100 942 305 297 4,37 38,167 56 000 9 180 36 448 45 627 0,65 5,708 64 000 431 209 95 112 526 321 7,54 65,799 72 000 45 391 41 755 87 146 1,25 10,8910 80 000 83 913 93 337 177 250 2,54 22,1611 88 000 13 744 39 841 53 585 0,77 6,7012 96 000 838 187 82 794 920 981 13,19 115,1213 104 000 9 180 36 448 45 627 0,65 5,7014 112 000 88 477 96 730 185 207 2,65 23,1515 120 000 45 391 41 755 87 146 1,25 10,89
Summary 2 114 894 975 133 3 090 027 2,95 25,75
44© Wärtsilä
Cementos Diamante, Colombia
Main data:
MW capacity 25 MWPrime movers 5 x 18V34SGCOD October, 1998Term of O&M contract 15 years
Operational data in December 2004
Running hours 42000 h (mean value)Efficiency (gross) 40,3 %
(net) 39,5 %Availability 96,1 %Reliability 99,2 %Utilisation factor 97,8 %Capacity factor 82,9 % Load factor 88,2 %
(COD) Commercial Operation Date
O&M Reference Projects
45© Wärtsilä
Cementos Diamante, Colombia
Since the start of operation, the power plant has provided the cement plant with substantial savings in energy costs.
The power plant operates in parallel with the grid but has the ability to run independently should there be grid problems.
Up to May 2004, the power plant has operated 574 times in island mode due the disturbances in grid supply.This reliability in energy supply ensures an uninterrupted cement production
O&M Reference Projects
46© Wärtsilä
Wärtsilä 34SG references
Owner: PG&E National Energy GroupLocation: Plains End, Colorado, USAEngine: 20 x Wärtsilä 18V34SGOutput: 111 MWe
COD of the project *) May 2002Terms of O&M contract 5 years
*) (COD) Commercial Operation Date
47© Wärtsilä
Plains End
99,2
99,3
99,4
99,5
99,6
99,7
99,8
99,9
Jan Feb Mar Apr May Jun Jul Aug Sep Oct
���������������� ���
48© Wärtsilä
Reference list – W18V34SG
�#�����# ��� ��� �
� First plant delivered 1995 to city of Gram, Denmark. 1 x W18V34SG
� Totally 72 Plants delivered with 184 engines, totally 1044 MWe
� 10 plants above 30 MWe size
� 43 CHP plants with 77 engines, 442 MWe
� Biggest plant delivered: Plains Endin USA 20 x W18V34SG, 113,4 MWe (peaking)
49© Wärtsilä
Reference list – W20V34SG
���� ����� ���� �� ����� �� � ������������ ����� ��� ����������� ���������� � 8.73���� ����� ��� ����������� ����� �!� " 69.84���# $�� ��%� &���'�� !��(������)���(*���' �# 118.146���# ����� �������+!���'������ ,�� �(������-����� � 8.69���# ����� ��� ����������� ���������� � 17.46���# ���-. )���! )� ��(������� / 24.249���# �$���. )��( )0�& # 34.92���# �$���. ,!��� )����������� � 17.46���# �$���. $(� &!1���2���� � 8.73���# �$���. .�!% 3!��������4� � 8.69���# �$���. &��( ��5(�� � 9���# �$���. ����6� ��'�����4��$���� � 8.73���# �$���. ����� �!��������4� � 8.73���# �$���. �1�� ������1������� � 18���# 7$� ��. &�� �(� ,7+���89 / 19.995���/ �$���. �1�� ������1 / 25.5���/ �+��� ���4!� �'!��������%�� � 15.44���� $�� ,����!:���!�*��;); ��+��<�,����!:���!� � 7.3���� ���)��� �����=5��� �����=5���(�>4���%��%?�� � 8�@@@ �+��� &��)�0�<�A�1'� &+++��� � 7.8
TOTAL Engines 53 445.41 MWCylinders 1060
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� First plantdelivered 2001 to cityof Ringköping, Denmark. 1 x W20V34SG
� Totally 28 plants with 78 engines, totally 662 MWe
� 5 plants above 30 MWe size
� 19 CHP plants with 42 engines, 354 MWe
� Biggest plant delivered: Berrick Goldstrike Inc. in USA14 x W20V34SG, 118,1 MWe (Base Load)
50© Wärtsilä
Wärtsilä 34SG references
Owner: Ringkøbing FjernvarmeværkLocation: Ringkøbing, DenmarkEngine: 1 x Wärtsilä 20V34SGOutput: 8 MWeCHP Power plant
51© Wärtsilä
Wärtsilä 34SG references
Györhö gas power plant in Hungary,combined heat and power (CHP), 2 x Wärtsilä 18V34SG, Output: 12 MWe, 10.92 MWth, Efficiency 82.9 %
52© Wärtsilä