Steam turbine in Geothermal Power Station
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Steam turbine in Geothermal Power
Station
Presented by:S. Ady Candra
Post Graduate Certificate in Geothermal Energy Technology
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Flow Diagram Conventional Thermal Power Plant
Main Equipments1. Boiler and auxiliary Equipment 2. Steam Turbine and Auxiliary
Equipment3. Condenser and Cooling
System 4. Feed Water Heating Plant 5. Chemical Feed System
Balance of plant1. Waste Water & De-mineralized water Plant2. 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
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Flow Diagram Geothermal Power Station (Pohipi )
Main System1. Bore /Steam field2. Separator/Flash Plant3. Steam treatment (scrubber)
If needed4. Steam Turbine and
Auxiliary Equipment5. Condenser and Cooling
System 6. Chemical Feed System If
needed7. NCG Removal and
treatment 8. Reinjection System
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Steam Turbine and Auxiliary Equipment1.Lubricating system2.Lubricating Oil cooling
system3.Crane & hoist system
Condenser and Cooling System 1.Condenser2.Condensate & Cooling
water pumps3.Cooling tower or one
through system
The same item between thermal & Geothermal Power plant
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Type of steam turbine : Exhaust conditions
◦ Non condensing (back pressure)
◦ Full condensing Flow designation
◦ Single or double flow Pressure-reheat
designation
Type of steam turbines
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Extraction types (pass out)Number of inlet steam (pass in)
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Shaft orientation(Tandem and cross compound)
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Exhaust condensing orientation(Downward, over upward & axial )
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Main consideration◦Steam properties◦Pressure & Temperature of steam
◦Material of steam turbine Casing Shaft Blade
Design and selecting of steam turbine for geothermal Power Plant
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Common design construction of steam turbine-generator set Downward
condensing Steam turbine
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Axial Exhaust Design Of Steam Turbine
New Design Arrangement of Steam Turbine-generator set
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PerformanceTurbine buildingPeriod for site erection work
Comparison of Axial & Downward Steam Turbine
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Axial exhaust turbines offer reduced exhaust loss and greater efficiency as compared to upward and downward exhaust turbines.
Performance
Downward exhaust Axial exhaust
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Turbine building
Axial Exhaust turbine•Above-ground foundation concrete reduced by 30%.
•Total building floor area reduced by 75% and total volume by 67%
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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.
Period for site erection work
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Hellisheidi Geothermal Power Station, Iceland
Geothermal power station with Axial exhaust Steam turbine
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 6Last blade height 762 mmType of condenser Shell & tube (surface cooling type) Type of cooling tower Mechanical draft, counter flow
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Turbine floor Hellisheidi geothermal Power Station
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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/fukusui_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.
References list
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Thanks