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Wear of geothermal turbine. Sæmundur Guðlaugsson
ON
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Presentation subject
1. ON Power
2. Maintenances plan
3. Main machinery parts of Turbine
4. Main wear problem and planning and development.
5. Conclusion
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Reykjavík Energy
Group Reykjavík Energy is owned by three municipalities: The
city of
Reykjavik, Akranes and Borgarnes.
ON Power: Production and sales of electricity and hot water.
OR Utilities: Distribution of electricity, hot water, cold
water
and runs the sewage systems.
GR Fibernet: Operates a fiber optic network
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Power Plants
Hellisheiði Geothermal Power plants
Nesjavellir Geothermal Power Plants
Andakílsárvirkjun Hydro power plant
Capacity of 8 MWe
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Hellisheiði Power Plants 2006
Combined Heat and Power plant
303 MWe of electricity and133 MWth of thermal
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Nesjavellir Power Plant 1990
Combined Heat and Power plant
Commissioned : 2005 (newest
part)
120 MWe of electricity and 300 MWth of thermal
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ON Power
36 boreholes for Hellisheiði Power Plants 19 boreholes for
Nesjavellir Power Plants Nesjavellir 240 kg/s Hellisheiði 480
kg/s
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Maintenances plan
» After two years of running, turbines is stop in one week for
inspection,
electrical inspections along with views of auxiliary equipment
and cleaning
of the cooling tower
» After four years of running, turbines is stop in three weeks
for overhauling
» After twelve years overhauling of the generators
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Overhaul of geothermal turbine
» Replacement of defective parts
» Cleaning parts
»Repair worn parts
» NDT inspection of rotors
» Settings of diaphragm
» Measurement of seals
»Assemble
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Machinery parts of Turbine
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Main wear problem planning and development
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Dissolution of seats for the diaphragm
The stem and woter is flow under the diaphragm an is cut the set
and the diaphragm
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Repair the wear of seats for the diaphragm
Milling for the 304 strip
strips fixed by welding
The seat in the casing is grinding
down of 2mm and welded with 309
Mo wire
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Dissolution between blades on the diaphragm
The steam has
excavated down into material
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Dissolution between blades on the diaphragm
•The steam has engraved into
the material
•Welding wire ER309Mo or D-10 Ni base 182 Nickel Base
Alloys.
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Welding near the blade
Special holder for diaphragm designed for welding
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CMT welding for the diaphragm
» CMT stands for Cold Metal Transfer
» Reduced heat exposure to the material that is being
welding
» Reduced mixing of the base material in the welding string
» The risk of deformation will be lower
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Before repair Surface welded with stainless wire ER309Mo After
2mm metal processing Final metal working
After repair 2mm stainless coating on surface assembly.
Repair of dissolution in assembly surfaces
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Dissolution in the casing bottom
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Improvements of drain water from engine
Condensate water
drains directly from
steps and drains
increased.
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Dissolution of the rotor
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Dissolution of the balance hole and connection point for the
blade.
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Dissolution of the last blade
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Turbine axle worn.
Our method now:
Mille down 5mm
and welde with
Inconel wire..
heat treatment
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Repair of turbine blades
Wear gap in blade
Material in the blade
AISI 630
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Rotor workshop in Hellisheiði Power Plants
Invested in:
Balance unit
Lathe
Welding unit
PWHT equipment
NDT equipment
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Rotor repair example
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Repair and provides components in geothermal turbines ON
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Conclusion
» Lower spare parts prices
» Lower the cost of repair of turbine components
» High quality work on repairs based on what was known from
foreign
suppliers.
» Raises the level of technology in the country
» increases operational reliability
» Creates jobs in the country
» We estimate when wee have used this repair technology for all
of our units
it will be possibility extended between the overhauling from
four years to
five or six years.
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Conclusion
» Lower spare parts prices
» Lower the cost of repair of turbine components
» High quality work on repairs based on what was known from
foreign
suppliers.
» Increase the knowledge of repair techniques in the country
» Increases operational reliability
» Creates jobs in the country
» Saves currency
» Because of this repair development it will be possible to
extend between
owerholing of units from four years 5 to 6 years when we have
finished a
overhaul of our machines with this techniques.
Foresight-Efficiency-Integrity
Thank you
