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Steam generator comprising a water supply and transport unit for capturing exogenous impurity

A technology of a steam generator and a conveying device, which is applied in the field of steam generators, can solve the problems such as the inability of the screen to filter the feed water effectively and the damage to the screen.

Inactive Publication Date: 2004-08-18
FRAMATOME ANP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] When larger debris hits the screen, the debris may be sent back towards the supply pipe of the header, or may damage the screen, so the screen will not be able to effectively filter the feed water

Method used

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  • Steam generator comprising a water supply and transport unit for capturing exogenous impurity
  • Steam generator comprising a water supply and transport unit for capturing exogenous impurity
  • Steam generator comprising a water supply and transport unit for capturing exogenous impurity

Examples

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Embodiment Construction

[0037] Figure 1 is a partial axial section through an upper portion of a steam generator, generally indicated by reference numeral 1, comprising a generally cylindrical housing 2 comprising a lower portion 2a having a first diameter an upper portion 2b having a second diameter larger than the first diameter; and a connecting portion having an overall frusto-conical shape between the lower portion 2a of the smaller diameter and the upper portion 2b of the larger diameter between.

[0038] The steam generator tube bundle 3 formed by the tubes 4 bent into a U shape is contained in a generally cylindrical tube bundle packaging shell 5, which is coaxially arranged inside the shell 2, the shell 2 and the tube bundle packing shell 5 have the same vertical axis of symmetry 6 .

[0039]For better clarity, only four tubes 4 of the steam generator tube bundle 3 are shown in Fig. 1, each tube has two straight branches and a semicircular bend, the bending radius of the tubes 4 decreases f...

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PUM

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Abstract

The steam generator includes a feedwater delivery device at an upper axial end of an annular space between an outer shell and a bundle wrapper of the steam generator. The feedwater, delivery device includes a header ( 11 ) having a shell of toroidal general shape, at least one feed pipe for the header and feedwater distribution means ( 14 ) in the upper part of the annular space of the steam generator. The feedwater distribution means ( 14 ) include a plurality of openings ( 17 ) that pass through the upper part of the shell of the toroidal header ( 11 ) and are distributed circumferentially on the wall of the header and a plurality of tubes ( 15 ) fixed via a lower end part at an opening ( 17 ) of the header ( 11 ). Each of the straight tubes ( 15 ) includes an upper end part through which openings ( 20 ), such as water passage slots, pass and a cap ( 16 ) fixed to the upper end of the tube ( 15 ) surrounding, with a radial clearance, the upper end part of the tube ( 15 ). In this way, the feedwater is properly distributed and foreign bodies possibly contained in the feedwater are trapped.

Description

technical field [0001] The present invention relates to a steam generator comprising feed water delivery means for trapping impurities. Background technique [0002] A steam generator, such as that of a nuclear reactor cooled by pressurized water, comprises a casing of generally cylindrical shape arranged vertically in the nuclear reactor building, that is to say the axis of the casing is arranged vertically. [0003] The steam generator of the pressurized water nuclear reactor heats and evaporates the feed water by exchanging heat with the pressurized cooling water of the nuclear reactor, and the pressurized cooling water circulates in the heat exchange tube bundle. The tube bundle is arranged within a generally cylindrical tube bundle packaging shell, which is coaxially arranged inside the housing. [0004] The tube bundles are secured at their ends in the tube sheet such that they open at a first end into a first part of the steam generator's tank and at a second end int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/02F22B37/22
CPCF22B37/228F22B1/025
Inventor 吉勒·达格
Owner FRAMATOME ANP