building new power plants under continuous exploitation of ......kapf surge chamber innertkirchen 1...
TRANSCRIPT
BUILDING ON RECENT DEVELOPMENT PROGRESS
Session 20: Hydro plant rehabilitation and refurbishment
Building new power plants under
continuous exploitation of neighboring
hydropower schemes
Michael Müller IUB, Manuel Zahno IUB, Yves Keller IUB, Peter Billeter IUB,
Jan Stamm KWO, Markus Kost KWO
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
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Content
Project background
Constraints
Specific challenges
Conclusion (Picture: wikimedia commons)
Planning and construction challenges
of the “Tandem” enhancement project
in Switzerland
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
3 / 18
Existing hydropower schemes – Handeck 2
Project background Constraints Specific challenges Conclusions
Project background
Handeckfluh
surge tank &
Gauli surge shaft
=
Pressure tunnel
Räterichsboden - Handeckfluh
Pressure
shaft
Lake
Räterichsboden,
25 Mio. m3
Compensation basin
& storage tunnels
Handeck 2
cavern power house,
4 Pelton Turbines,
136 MW
"Upper reservoir"
for next hydropower stage
ca.
460 m
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
4 / 18
Existing hydropower schemes – Innertkirchen 1
Project background Constraints Specific challenges Conclusions
Project background
Pressure tunnel
Handeck - Kapf
Pressure
shaft
Aare River
Kapf surge chamber
Innertkirchen 1
cavern power house,
5 Pelton Turbines,
255 MW
Tailrace
tunnel
ca. 6
70 m
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
5 / 18 Project background Constraints Specific challenges Conclusions
Project background
Enhancement project “Tandem”
Handeck 2A
enhancement
Innertkirchen 1E/S
enhancement
Additional parallel systems to the existing plants
Increase overall installed capacity
Increase operational flexibility
Reduce friction losses
30 m3/s + 23 m3/s
136 MW + 90 MW
Gain in energy production: 70 GWh/year!
40 m3/s + 25 m3/s
255 MW + 150 MW
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
6 / 18 Project background Constraints Specific challenges Conclusions
Project background
Enhancement project “Tandem” – part HA2A
New pressure tunnel, L = 3,365 m,
drilling and blasting (D&B)
New pressure shaft,
L1 = 387 m, 15% (D&B),
L2 = 357 m, 142.82%
(ALIMAK)
New Handeck 2
cavern power house,
1 Pelton Turbine,
90 MW
New valve chambers
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
7 / 18
Enhancement project “Tandem” – part INN1E/S
Project background Constraints Specific challenges Conclusions
Project background
New pressure shaft,
L1 = 984 m, 9.45%,
L2 = 1,015 m, 70.02%
(both TBM)
New compensation basin,
V = 19,800 m3
Enhanced Kapf
surge chamber
New Innertkirchen 1E
cavern power house
1 Pelton Turbine
150 MW
New tailrace tunnel,
L = 2,100 m (D&B)
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
8 / 18 Project background Constraints Specific challenges Conclusions
Constraints in time and space
High Alpine Environment – HA2A
View from Handeckfluh,
June 2011
Construction site Handeck,
November 2011
Area near Lake Räterichsboden,
September 2013
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
9 / 18 Specific challenges Conclusions
Constraints in time and space
Underground access
tunnels of > 6 km length
Underground garage
and factory
High Alpine Environment – HA2A
Project background Constraints
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
10 / 18 Specific challenges Conclusions
Constraints in time and space
Only access to Kapf
construction site:
Ropeway for material transport,
cable car for workmen
High Alpine Environment – INN1S
Project background Constraints
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
11 / 18 Specific challenges Conclusions
Constraints in time and space
Construction close to running hydro power plants
Construction works at some 20 to 70 m
from existing and running
hydro power systems
Real time monitoring of vibrations
due to excavation works
Increased discharge for the existing
intake structure with consequent
danger of air entrainment
Conception of flow straightener and
deaerating chambers
Project background Constraints
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
12 / 18 Specific challenges Conclusions
Constraints in time and space
Limiting exploitation interruptions to a very minimum
One single reservoir drawdown and emptying of the entire system
between Lake Räterichsboden and Innertkirchen
Project background Constraints
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
13 / 18 Specific challenges Conclusions
Specific planning and construction challenges
Coupling processes of hydraulic systems
One single reservoir drawdown and emptying of the entire system
All connections between systems within 16 weeks from November
2014 to February 2015
Project background Constraints
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
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0
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1740
1745
1750
1755
1760
1765
1770
1775
1780
800 1100 1400 1700 2000Time [s]
Handeckfluh surge tank
Gauli surge shaft
Turbine discharge
Water level [m a.s.l.]
Turbine discharge[m3/s]
0 300 600 900 1200
Specific challenges Conclusions
Specific planning and construction challenges
Pressure conduits and hydraulic transients
New headrace tunnels and pressure shafts for both HPPs
Integration of existing surge tank/chamber in the new system?
Extension of existing surge tank/chamber?
Project background Constraints
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
15 / 18 Specific challenges Conclusions
Specific planning and construction challenges
Pressure conduits and hydraulic transients
New headrace tunnels and pressure shafts for both HPPs
No extension necessary for Handeckfluh surge tank, but additional
volume required for the Kapf surge chamber
Project background Constraints
New upper surge chamber,
acces tunnels and
hydraulic connections
New safety valves cavern
New penstock
New headrace tunnel
New access tunnel
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
16 / 18
Reduction of downstream impact of hydropower operation
Sudden opening/closing operations of turbines leads to highly unsteady
flow in downstream river
Hydropeaking mitigation measure:
V1 = 60,000 m3 by regulated downstream tunnel +
V2 = 20,000 m3 by basin
Specific challenges Conclusions
Specific planning and construction challenges
Project background Constraints
Existing INN2
power house
INN1 & INN1E tailrace tunnel
regulation gates
Compensation basin
regulation gates
INN2 turbine
release
Session 20
Building new power plants under continuous exploitation of neighboring hydropower schemes
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Key questions to be solved for successful realization of plant
enhancement under continuous exploitation of neighboring HPPs
Optimized integration of existing systems minimization of new
structures extent
Detailed analysis of hydraulic aspects and coupling processes
head loss optimization, mitigation measures
Planning and monitoring of construction processes minimization of
production losses
Specific challenges Conclusions
Conclusions
Project background Constraints
New HA2A power house,
October 2014
New INN1E power house,
September 2014
INN1E Compensation basin,
September 2014
BUILDING ON RECENT DEVELOPMENT PROGRESS
Session 20: Hydro plant rehabilitation and refurbishment
Thank you.
Michael Müller
IUB Engineering Ltd, Belpstrasse 48, Postfach, 3000 Bern 14, Switzerland