Selecting steam turbine for geothermal

1. Presented by:
S. Ady Candra
Post Graduate Certificate in
Geothermal Energy Technology

2. Main Equipments
1. Boiler and auxiliary Equipment
2. Steam Turbine and Auxiliary
Equipment
3. Condenser and Cooling System
4. Feed Water Heating Plant
5. Chemical Feed System
Balance of plant
1. Waste Water & De-mineralized water Plant
2. Fire Protection System
3. Compressed Air System
4. Fuel & Material Handling System
5. Sampling Rack System
6. Laboratory Equipment
7. Hoist Auxiliary Utility Devices
8. Workshop and Machinery Equipment

3. Main System
1. Bore /Steam field
2. Separator/Flash Plant
3. Steam treatment (scrubber)
If needed
4. Steam Turbine and Auxiliary
Equipment
5. Condenser and Cooling
System
6. Chemical Feed System If
needed
7. NCG Removal and treatment
8. Reinjection System

4.  Steam Turbine and
Auxiliary Equipment
1.Lubricating system
2.Lubricating Oil cooling
system
3.Crane & hoist system
 Condenser and Cooling
System
1.Condenser
2.Condensate & Cooling
water pumps
3.Cooling tower or one
through system

5. Type of steam turbine :
 Exhaust conditions
◦ Non condensing (back
pressure)
◦ Full condensing
 Flow designation
◦ Single or double flow
 Pressure-reheat
designation

9.  Main consideration
◦Steam properties
◦Pressure & Temperature of steam
◦Material of steam turbine
 Casing
 Shaft
 Blade

10.  Downward
condensing
Steam turbine

11.  Axial Exhaust Design Of Steam Turbine

12.  Performance
 Turbine building
 Period for site erection work

13.  Axial exhaust turbines offer reduced exhaust
loss and greater efficiency as compared to
upward and downward exhaust turbines.
Downward exhaust Axial exhaust

14. Axial Exhaust turbine
•Above-ground
foundation concrete
reduced by 30%.
•Total building floor area
reduced by 75% and total
volume by 67%

15.  Axial exhaust turbines require less
foundation concrete and a smaller building,
thereby reducing both the cost and the lead
time of construction.
 Axial exhaust turbines reduce the cost of
maintenance and the space required in which
to perform it.

16.  Hellisheidi Geothermal Power Station, Iceland
Type of plant Single flash, condensing
Rated output 40 x 2 units (MW)
Steam conditions
• Pressure 0.75 (MPa)
•Temperature 167.8 (oC)
Exhaust pressure (MPa abs.) 0.01
Type of turbine SC1F-30 AX "
(Single-cylinder, single flow,
impulse-reaction axial exhaust
condensing turbine)
Exhaust type Axial exhaust
Rated speed 3 000 (rpm)
Number of stages 6
Last blade height 762 mm
Type of condenser Shell & tube (surface cooling type)
Type of cooling tower Mechanical draft, counter flow

18. Black & Veatch, 1996, Power plant engineering,
Springer Science+Business Media, Inc.
Condensing Multistage Axial Exhaust Steam
Turbine, 2012. Retrieved from
http://www.snm.co.jp/products/turbines/fukusu
i_02.html
Nagasaki Shipyard & Machinery Works, 2007, A New
Geothermal Steam Turbine with a "Single-
Cylinder Axial Exhaust Design" (Outline of the
Hellisheidi Geothermal Turbine in Iceland),
Technical Review Vol. 44 No. 4. Mitsubishi Heavy
Industries, Ltd.

19. Thanks