Turbine including exhaust hood

a turbine and exhaust hood technology, applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of affecting the overall performance of steam turbines, and complex and uneven construction of exhaust hoods

Inactive Publication Date: 2012-06-28
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In accordance with another embodiment of the present invention, the turbine includes one or more tip leakage flow injection channels which inject the exhaust gases at the inner surface of the flow guide. The injection channels are provided to energize flow of the exhaust gases in the annular passage and prevent the boundary layer separation at the inner surface of the flow guide.

Problems solved by technology

This leads to the formation of vortices, decreases pressure recovery in the annular passage, and affects the overall performance of the steam turbine.
However, geometry modifications lead to a complex and uneven construction of the exhaust hoods.

Method used

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  • Turbine including exhaust hood
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  • Turbine including exhaust hood

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Embodiment Construction

[0015]Illustrative embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings. The invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout.

[0016]Embodiments presented herein enable the guiding of exhaust gases in a downward exhaust hood configuration of a turbine.

[0017]Turning now to the drawings, and referring first to FIG. 1, an exemplary embodiment is shown in accordance with certain aspects of the present invention. FIG. 1 illustrates a longitudinal cross-sectional view through a portion of a turbine 100 with a downward flow exhaust hood 102. In an embodiment of the present invention, the turbine 100 may include a steam turbine and the exhaust gases thereof include steam.

[0018]Generally, the turbine 1...

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Abstract

A turbine includes an inner casing, a rotor extending in a longitudinal direction, and rows of buckets transversely disposed on the rotor. A bearing cone covering a portion of the rotor and a flow guide extending from the inner casing define an annular passage for flow of exhaust gases. Exhaust gas movement is facilitated by a guide cap having a streamlined surface and situated in a downstream direction of the flow guide, a tip leakage flow injection channel to inject exhaust gases at the inner surface of the flow guide, an incline of the casing of the turbine surrounding the last stage buckets relative to the longitudinal axis, or use of a first portion of the annular passage with a substantially constant surface area and a second portion of the annular passage with a progressively increasing surface area.

Description

BACKGROUND[0001]The present invention relates to steam turbines. More specifically, the present invention relates to embodiments to provide improved exhaust hood performance in a steam turbine.[0002]Steam turbines are widely used for power generation and primarily include a casing, a rotor extending in a longitudinal axis of a steam turbine, and a plurality of rows of buckets transversely disposed on the rotor. During operation, exhaust gases leave a last row of buckets and flow through an annular passage. Typically, the annular passage is defined by a steam guide which extends from the casing and a bearing cone that surrounds a portion of the rotor. Depending on various configurations of the steam turbine, the annular passage acts as an exhaust hood to diffuse the exhaust gases and direct the exhaust gases towards a condenser.[0003]Particularly in a downward exhaust hood configuration, the exhaust gases are required to turn 180 degrees after leaving the annular passage and prior to...

Claims

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Application Information

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IPC IPC(8): F04D29/54
CPCF01D25/30
InventorONGOLE, CHAITANYA VENKATA RAMA KRISHNADEY, SUBHRAJITLADOON, DALE WILLIAMSANTHANAKRISHNAN, MANISEKARANMISTRY, HITESHKUMAR RAMESHCHANDRA
OwnerGENERAL ELECTRIC CO