Evolution of D Series CC Steam Turbine (R3)
16Pages

Evolution of the D Series Combined Cycle Steam Turbine June 2011

©2011 General Electric Company. Proprietary. All Rights Reserved. No part of this document may be reproduced, transmitted, stored in a retrieval system nor translated into any human or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior written permission of the General Electric Company.

A Brief History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introducing Structured Design. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 109D-12 – Single and Multi-shaft Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Evolution of the D Series Combined Cycle Steam Turbine GE’s D Series combined cycle (CC) steam turbine provides our customers a high power density, world-class thermal efficiency product. Available in both 50 or 60 Hz single shaft and multi-shaft configurations, the D Series CC steam turbine is designed for a wide range of inlet steam conditions and HRSG firing capabilities. With a fleet of over 5000 units installed worldwide, GE’s experience as a steam turbine designer and manufacturer continually evolves. Figure 1. GE CC Steam Turbines CODs I. A Brief History GE’s continuing development...

Introducing Structured Design With worldwide demand increasing in the late 1990s, GE introduced the structured 207D-11 offering to support the power generation needs of our customers. Building on our F class gas turbine and steam turbine products, the structured design provides enhanced solutions for combined cycle power generation, significantly decreasing delivery time. The structured 207D-11 concept evaluated the design space for a GE 207FA combined cycle power plant, creating customized pre-engineered combined cycle steam turbine solutions. From 2000 to 2002, GE shipped over 100 207D-11...

109D-14 – HEAT Technology in Double Flow Configurations for 50 Hz Building on A Series HEAT technology, and fleet experience of 27 units with over 250,000 operation hours, GE introduced the 109D-14 steam turbine for 50 Hz applications. This design supports an integrated 50 Hz SS plant design with high power density, increased efficiency and operational flexibility. The 109D-14 incorporates advances in drum rotor technology, and separate HP and IP sections (three separate casings design), and supports inlet steam capabilities of 2400 psig/1080°F/1080°F. This integrated plant design with GE’s...

Impulse and Reaction Technologies GE’s D Series combined cycle steam turbine designs incorporate both impulse and reaction technologies. The 109D-10, 207D-11, 207D-11A, 207D-11D and 109D-12 are impulse designs, with Dense Pack features such as higher reaction, compact stage spacing, advanced seals and integral cover buckets. The 109D-14, 207D-17, and A Series combined cycle products incorporate our HEAT reaction steam path technology, providing additional improvement in overall efficiency. Improvements in Diaphragm Designs Singlets* are a standard feature in GE’s current impulse designs....

Integral Cover Buckets In 2000, GE introduced its first generation (Gen 1) Peened Cover Design • 5-7 tip seals • Cover gaps • Full rhombic • No cover gaps • Adv seal compatible • Same functionality • Enables shorter span Integral Cover Bucket (ICB) in fossil Dense Pack applications, followed by the incorporation of advanced integral covered bucket designs in the D Series combined cycle products. Today’s Gen 2 and T-root ICB designs have a full rhombic cover design, integrating advanced sealing technologies and clean root geometry, resulting in a smooth steam path sidewalls design and...

Brush Seals Advanced seals were developed and tested at GE’s Global Research Center to understand seal behavior under simulated steam turbine operating conditions. To date, brush seals offer the tightest clearance amongst all seals along with a significant improvement in leakage control and overall improved steam turbine performance. With advancements achieved in bucket design, brush seals are now employed at tip locations, significantly reducing leakage as compared to traditional bucket tip seal designs. A brush seal bristle pack is able to withstand transient events while maintaining the...

Main steam and reheat inlets are located in the lower half along with the HP exhaust with the crossover located in the upper half close to the HP exhaust. This allows the inner shell to be bathed with IP exhaust steam, eliminating potential thermal distortion from top to bottom. Benefits of GE’s 207D-11D design configuration include: • Reducing temperature on the outer shell to improve shell life and mitigate outer shell thermal distortion • Dramatically simplified and standardized bolting design to reduce flow losses at inlet and exhaust annuli (same material and same sized studs are used...

The 109D-14 combined cycle steam turbine was developed for this single shaft arrangement supporting GE’s integrated plant design solution. Nominally rated at 180 MW, the 109D-14 uses a three-casing design architecture with HEAT steam path technology with steam inlet capabilities of 2400 psig/1112°F/1112°F delivering shaft efficiencies of greater than 40%. Its three-casing design and drum-type rotor architecture along with high reaction HEAT steam path technology and stationary blade “blinglet” system enables improved clearance controls across shorter bearing spans, providing improved...

The key features of the 207D-17 steam turbine are: • Separate HP, IP and LP configuration – improved sealing and clearance control for increased efficiency • Proven HEAT steam path technology • HP, IP and LP drum rotor construction with blinglet nozzles • 0–100% duct firing capability • Advanced 40” (1020 mm) and 34.5” (880 mm) LSB with improved aerodynamic and dovetail configurations • Downward two-flow exhaust hood Figure 14. 207D-17 Steam Turbine • Modular section design – capable of five month installation V. Why Buy GE? We know steam turbines. With an installed fleet of over 5000...