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Steam turbine and method for retrofitting multi-stage partial arc steam turbine

A technology for steam turbines and arc segments, which is applied to the support elements of blades, stators, engine elements, etc., and can solve the problems of complex and expensive refurbishment

Inactive Publication Date: 2016-08-03
GENERAL ELECTRIC TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although existing partial-arc intake steam turbines can benefit from supercharged arrangements, retrofitting of arrangements is complex and expensive

Method used

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  • Steam turbine and method for retrofitting multi-stage partial arc steam turbine
  • Steam turbine and method for retrofitting multi-stage partial arc steam turbine
  • Steam turbine and method for retrofitting multi-stage partial arc steam turbine

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Embodiment Construction

[0015] Exemplary embodiments of the present disclosure will now be described with reference to the drawings, in which 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 disclosure. However, the present disclosure may be practiced without these specific details and is not limited to the exemplary embodiments disclosed herein.

[0016] figure 1 A state-of-the-art multi-stage partial intake arc steam turbine 10 is shown. Steam turbine 10 has an inner casing 12 supporting a plurality of blade rows, including a first blade row 18 , and an outer casing 14 surrounding the inner casing. Steam enters the turbine via a plurality of supply lines 24, 26 each connected to an intake arc segment 20 which feeds the first blade row 18 and which collectively form the main intake air.

[0017] In the exemplary embodi...

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Abstract

Provided is a steam turbine and a method of retrofitting a multi-stage partial arc of admission steam turbine. In particular the invention provides a method of retrofitting the multi-stage partial arc of admission steam turbine and the stream turbine obtainable by the method. The method comprises forming at least one inlet belt in the inner housing downstream of at least one the first blade rows of the steam turbine and forming a duct, connecting the first inlet line and the or each inlet belt. The duct and the inlet belt are adapted to enable a steam to pass through the first inlet line and bypass the first blade row of the steam turbine and the connection of the duct to the first inlet line is such that all steam flowing through the first inlet line passes through the duct.

Description

technical field [0001] The present disclosure relates generally to methods for retrofitting steam turbines, and more particularly, to retrofitting partial arc intake steam turbines. Background technique [0002] Small and medium sized turbines are widely used to generate electricity. The small inlet volumetric flow rate of these machines means that they require only minimal inlet flow area. As a result, these machines are typically configured with short blade heights and small metering angles. This configuration can result in a significant reduction in efficiency. A well-known way of solving this problem is to allow the steam to pass through more than one arc in a so-called partial-arc intake configuration, where the flow through each arc is controlled by separate control valves. flow. Local air intake is widely used in the first (control) stage of such turbines, and sometimes even in subsequent stages. In general, the efficiency of the first partial and downstream stag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D9/02F01D25/24
CPCF01D9/02F01D25/24F05D2240/14F05D2240/12F01D17/105F05D2220/31F05D2230/80F05D2270/16F01D5/06F01D9/06F01D25/26F05D2240/24
Inventor A.C.洛德D.L.贝尔
Owner GENERAL ELECTRIC TECH GMBH
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