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Power Generation 1

P11M Wieghardt

2005-10-27

Siemens Steam Turbine Design

for AD700 Power Plants(AD700 financed activities)

Kai Wieghardt

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AD700 Siemens Turbine Designs, AD700 Conference, Milan

Contents

1. Thermodynamics, Arrangement & Materials

2. HP Turbine Design

3. IP Turbine Design

4. Turbine Valves Design & COMTES700

5. Summary

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AD700 Siemens Turbine Designs, AD700 Conference, Milan

700C/720C Turboset (400 MW Single RH)Water Steam Cycle and Turbine Arrangement

350bar / 700C / 270kg/s

60bar / 720C / 220kg/s

5bar / 320C / 180kg/s

64bar / 410C

HP IP LP

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350/700C

60/720C

285/600C

64/355C

64/410C

60/620C

HP

IP

700C HP Turbine:

Inlet temperature

Inlet pressure Enthalpy drop

720C IP Turbine:

Inlet temperature

~ Inlet pressure~ Enthalpy drop

5/320C

LP4.5/230C

Steam Cycles 600C/620C vs. 700C/720CIP Turbine

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350/700C

64/410C

Solution: Barrel type HP Turbine design with Cooling

Pressure containment in vessel without horizontal flanges Symmetric inner casing without internal pressure

Best possible containment of hot main steam

700C HP Turbine:

Inlet temperature

Inlet pressure Enthalpy drop

Steam Cycles 600C/620C vs. 700C/720CConclusions for HP Turbine Design

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700C HP TurbineLongitudinal Section with External Cooling

Exhaust steam 64bar / 410C

Cooling steam from MS heater Main steam 350bar / 700C

HP IP

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60/720C

Solution: Proven design using

Superalloys and Cooling5/320C

Steam Cycles 600C/620C vs. 700C/720CConclusions for IP Turbine Design

IP

720C IP Turbine:

Inlet temperature

~ Inlet pressure

~ Enthalpy drop

4.5/230C

60/620C

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720C IP TurbineLongitudinal Section with External Cooling

Hot Reheat steam 60bar / 720C

Exhaust steam 5 bar / 320C

Cooling steam from CRH

HP IP

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720C IP TurbineWelded Rotor Design

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Test of a critical 700C Turbine Component:COMTES700 Turbine Valve

COMTES700 Turbine Valve Test

Test Phase 2005 2009

Full-scale component (4000kg)exposed to 210 bar / 705C

Main objectives:

Sliding & contact surfaces

Creep & LCF Volumetric contraction

100% privately financed

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COMTES700 Turbine ValveErected Valve with Actuator

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Siemens AD700 Turboset for 350bar/700C/720C has aclassical HP-IP-LP arrangement

HP turbine with proven barrel type design by using aninnovative external cooling concept

IP turbine with proven design and external CRH cooling

Main steam and reheat valves with proven design

Further 700C development steps are necessary including

lessons learned from COMTES700 (design optimisation,materials testing, design philosophy)

Siemens is engaged for this with large private investment.

Summary