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Multifrequency control stage for improved dampening of excitation factors

A control stage, entry arc technology, applied in the field of steam turbines, which can solve problems such as lack of uniformity of circumferential steam distribution

Inactive Publication Date: 2010-10-20
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides an alternative solution to the problems caused by the lack of circumferential steam distribution uniformity in the control stage of the partial arc entry system

Method used

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  • Multifrequency control stage for improved dampening of excitation factors
  • Multifrequency control stage for improved dampening of excitation factors
  • Multifrequency control stage for improved dampening of excitation factors

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Embodiment Construction

[0018] Preferred embodiments of the invention will now be described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It may be obvious, however, that the invention may be practiced without these specific details. Throughout this specification, a circumferential reference refers to an arc of constant vertical distance to the longitudinal axis of the turbine.

[0019] figure 1 A side view of a steam turbine is shown with a control stage 10 configured with a partial arc entry system. The control stage 10 includes stage valves 12 such as figure 2 As shown, it is used to control the load of the steam turbine. Downstream of the connection stage valve 12 is a nozzle chamber 14 . The downstream portion of the nozzle chamber 14 includes an inlet arc 16...

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Abstract

Provided is a multifrequency control stage for improved dampening of excitation factors. The control stage (10) comprises: a plurality of staging valves (12) circumferentially distributed around the turbine for regulating steam admission flow so as to control the loading of the turbine; nozzle chambers (14) connected to a downstream end of each staging valve (12); an arc of admission (16) forming the downstream portion of each nozzle chamber (14); and control stage nozzles (18) in the arcs of admission (16) defining the downstream end of the nozzle chamber (14). Each nozzle chamber has at least two arcs of admission. The arrangement improves steam flow distribution to downstream blades (30).

Description

【Technical field】 [0001] The invention relates to steam turbines. More specifically, the invention relates to the arrangement of steam turbine control stages. 【Background technique】 [0002] An effective way to curb the power output of a multi-stage steam turbine system is to rely on a separate steam supply system in which steam enters the turbine inlet through a number of segregated and individually controllable inlet arcs. In a method referred to herein as partial arc admission, the number of active primary nozzles is varied in response to changes in load. However, partial arc entry systems have in the past been recognized as having certain disadvantages which limit the efficiency of the work output through the entire control stage. Some of these limitations are due to unavoidable mechanical limitations, such as the unavoidable amount of windage and turbulence that can arise when the rotating blades pass through a nozzle bank that does not exhaust steam. This leads to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/12
CPCF01D9/06F01D9/047F01D17/145F05B2260/96F05D2220/31F01D17/18F05D2260/96
Inventor T·莫库利斯V·博里卡G·扎纳兹P·-A·马塞里M·塞尔
Owner GENERAL ELECTRIC TECH GMBH
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