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Flow guided steam strainer for steam turbine valves

a steam turbine valve and flow guide technology, applied in the field of steam turbines, can solve the problems of pressure drop, attendant vibration and noise, and far less than ideal

Inactive Publication Date: 2011-07-07
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]FIG. 2 is a more detailed perspective view, partially transparent, of a portion of the steam valve of FIG. 1 with a strainer according to an embodiment of the invention.

Problems solved by technology

It is known that the steam striking the solid portion of the strainer causes an undesirable pressure drop of the flow of steam across the strainer along with attendant vibrations and noise.
In other words, the aerodynamic flow path of the steam with respect to the strainer is far less than ideal, thereby possibly causing the aforementioned problems.

Method used

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  • Flow guided steam strainer for steam turbine valves
  • Flow guided steam strainer for steam turbine valves

Examples

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Embodiment Construction

[0013]In FIG. 1 is a steam valve 10 that is part of a steam turbine. For example, the steam valve 10 may be a combined main stop and control valve, a reheat valve or other type of steam turbine valve with various components therein (most not shown) to control and / or direct the flow of steam entering the valve 10 at an inlet 12 as indicated by the arrowhead 14, then passing through the valve and out of an outlet 16 of the valve 10 as indicated by an arrowhead 18 and on to further components of the steam turbine.

[0014]Shown in FIG. 1 is a strainer 20 located within a valve casing 22. The strainer 20 may comprise one or more layers of material having a plurality of perforations or holes 24 in each layer, where the holes 24 may be the same size or of different size. Typically the number of layers of material in which the holes 24 are formed is selected in an attempt to reduce the amount of pressure drop of the steam across the strainer 20. The holes 24 are typically sized to prevent the...

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PUM

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Abstract

A steam turbine valve includes a casing and an inlet in the casing through which a flow of steam flows into the valve. The valve also includes a strainer located in the casing, and a flow guide connected with the strainer to protrude out from the strainer at a location in which the flow of steam strikes the flow guide, changes direction in its flow with respect to the strainer, and passes through a flow path of the strainer to an inside portion of the strainer.

Description

BACKGROUND OF THE INVENTION[0001]The subject matter disclosed herein relates to steam turbines and, in particular, to a flow guided steam strainer for a steam turbine valve.[0002]In the operation of a steam turbine, oftentimes foreign objects in the form of solid particles of different sizes (e.g., oxide scale, metal scraps, objects left behind in the steam turbine piping) may enter the main steam path flowing from, for example, a boiler. A strainer is typically used to filter or block out the unwanted and potentially harmful particle impurities from the main steam flow. The strainer, which is typically cylindrical in shape, is commonly located within the casing of a valve located in the steam turbine, for example a combined main stop and control valve or a reheat valve. The strainer is positioned within the valve casing such that the steam entering the valve at an inlet directly strikes a solid surface on a portion of the outer circumferential surface of the strainer. The solid sur...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01D25/00
CPCF01D17/10F01D17/145F01D25/002F05D2260/607F16K47/08F05D2220/31F05D2260/602F01D25/32Y10T137/8085Y10T137/794
Inventor CHOWDHURY, ABHISHEKDONE, VAMSHIDHARSHAH, VISHAL
Owner GENERAL ELECTRIC CO
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