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Steam terbine steam intake and modifying method thereof

A steam turbine, steam inlet technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unstable mass flow, energy loss, uneven velocity distribution, etc.

Inactive Publication Date: 2007-08-08
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steam inlet ring with a fixed cross-sectional area in the casing is connected to the steam inlet port. When the steam passes through the circumferential area of ​​the steam inlet ring in a direction away from the steam inlet port, a large amount of steam will be generated due to the reduction of the steam flow rate. energy loss
Since the inlet annulus has a substantially constant flow cross-sectional area, it causes mass flow instability and creates an uneven velocity distribution at the axial inlet into the first-stage nozzle

Method used

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  • Steam terbine steam intake and modifying method thereof
  • Steam terbine steam intake and modifying method thereof
  • Steam terbine steam intake and modifying method thereof

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Embodiment Construction

[0024] Referring to FIG. 1 , there is shown a turbine casing, generally designated 8 , comprising an upper shell 10 and a lower shell 12 interconnected along a horizontal centerline 14 and encircling a rotor shaft 16 . It can be seen that the upper shell 10 and the lower shell 12 extend axially integrally in axially opposite directions, and in the embodiment described, the upper and lower shells 10 and 12 form parts of an axial split steam turbine, wherein the shaft of the turbine Steam is received to opposite stages by means of annular axial passages or outlets 18 . The upper shell 10 and the lower shell 12 form inlet ports 20 on opposite sides of the turbine casing 8 . For a low pressure steam turbine, inlet ports 20 receive high pressure steam (not shown) from a high pressure section and cause the steam to flow in a substantially annular chamber 22 surrounding rotor 16 .

[0025] A portion 21 of a substantially annular chamber 22 of the upper shell 10 is defined by a perip...

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PUM

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Abstract

A pair of steam turbine inlet ports (20) are disposed at opposite sides of a steam turbine housing for flowing steam in opposite circumferential directions in a generally annular steam chamber to first stages of a turbine through axially opposite outlets. Portions of the chamber in the upper and lower housing (10, 12) have decreasing cross-sections in a generally circumferential direction away from the steam inlet portions to provide a substantially uniform flow of steam about the chamber in a generally radially inward direction and about and through the axial outlets (18).

Description

technical field [0001] The present invention relates to steam inlets for steam turbines for providing substantially uniform mass flow and velocity as the steam flow enters the first stage axially; in particular, the invention relates to steam inlets having a linearly varying cross-sectional area, which The linear change of the cross-sectional area is carried out in the circumferential direction from the steam inlet port close to the horizontal centerline to the upper and lower ends of the vertical centerline of the fixed casing, wherein the energy loss based on non-uniform steam flow is minimized or eliminated . The invention also relates to a method of retrofitting an existing steam turbine so that the first stage nozzles are supplied with steam having a uniform mass flow and velocity at the steam inlet. Background technique [0002] In a steam turbine, such as a low-pressure steam turbine, steam fed from the high-pressure section flows into a low-pressure steam inlet, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01D1/02F01D25/28F01D9/04F01D9/06
CPCF01D9/048F05D2220/31F05B2220/301F01D9/045Y10T29/49238F01D9/06F01D25/28
Inventor D·M·布朗G·H·柯比A·I·C·亨特R·L·马蒂西B·E·汤普森
Owner GENERAL ELECTRIC CO