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Horizontal steam generator for a nuclear power station and method for assembling same

A technology for steam generators and nuclear power plants, which is applied to the steam generation method using heat carrier, the steam generation method, and the primary side of the steam generator, which can solve the problems of reducing the strength of the header and achieve the effect of effective heat transfer

Inactive Publication Date: 2017-11-28
EXPERIMENTAL & DESIGN ORG GIDROPRESS AWARDED THE ORDER OF THE RED BANNER OF LABOUR & CZSR ORDER OF LABOUR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of dense deep holes reduces the strength of the header and limits the number of heat exchange tubes that can be placed in the steam generator

Method used

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  • Horizontal steam generator for a nuclear power station and method for assembling same
  • Horizontal steam generator for a nuclear power station and method for assembling same
  • Horizontal steam generator for a nuclear power station and method for assembling same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] Manufacturing steam generators with the following parameters:

[0084] ●Heat power Q=750MW,

[0085] ●Coolant flow rate G=22000m 3 / h,

[0086] ·Heat exchange surface area H=6000m 2 ,

[0087] ·The outer diameter of the heat exchange tube dtb=21mm, the wall thickness δ=1.5mm,

[0088] ·Coolant pressure P=16MPa,

[0089] ·The tube arrangement is staggered (k=1),

[0090] · The vertical and horizontal spacing of the tubes in the tube bundle Sv=Sh=36mm.

[0091] According to the claimed technical solution, the acceptable lower limit of the number of heat exchange tubes that can be installed in the steam generator vessel is:

[0092]

[0093] The acceptable upper limit of the number of heat exchange tubes that can be installed in the steam generator vessel is:

[0094]

[0095] Compare the coolant flow rate W (m / s) of the steam generator design with the number of heat exchange tubes within the export range 1988≤Ntb≤11417 with the coolant flow rate of the steam generator with the number of...

example 2

[0110] Manufacturing steam generators with the following parameters:

[0111] ·Heat power Q=1000MW,

[0112] ●Coolant flow rate G=36000m 3 / h,

[0113] ·Heat exchange surface area H=9000m 2 ,

[0114] ·The outer diameter of the heat exchange tube dtb=12mm, the wall thickness δ=1.1mm,

[0115] ·Coolant pressure P=17MPa,

[0116] According to the claimed technical solution, the acceptable lower limit of the number of heat exchange tubes that can be installed in the steam generator vessel is:

[0117]

[0118] The acceptable upper limit of the number of heat exchange tubes that can be installed in the steam generator vessel is:

[0119]

[0120] Compare the coolant flow rate W (m / s) of the steam generator design with the number of heat exchange tubes within the export range 6000≤Ntb≤32000 with the coolant flow rate of the steam generator whose number of heat exchange tubes exceeds the export range.

[0121]

[0122] The coolant flow rate of the steam generator with the number of heat exchange ...

example 3

[0134] A steam generator with the same input parameters as those of Example 1 was manufactured, in which the outer diameter of the heat exchange tube dtb=21 mm, and the wall thickness δ=1.5 mm. According to the present invention, the number of heat exchange tubes Ntb is selected from the range between 1998 and 11417. The blank area Stb of the heat exchange tube will be:

[0135]

[0136] In an in-line arrangement (k=1) and an equal vertical spacing S of 36mm v And horizontal spacing S h ( figure 2 ), the heat exchange tube bundle installation area ftb in each pipe will be:

[0137]

[0138] Then the relationship between the blank area Stb and the tube bundle installation area ftb will be:

[0139]

[0140] Therefore, ftb = 1296mm formed by four adjacent tubes 2 80% of the area of ​​the heat exchange beam unit can be used for boiler water (secondary circuit coolant) circulation, which allows it to flow smoothly.

[0141] Compliance with this standard increases the technical and econo...

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Abstract

This invention relates to steam generators, and more particularly to horizontal steam generators for nuclear power plants with a water-water energetic reactor (VVER). We claim a horizontal nuclear power plant steam generator comprising a cylindrical vessel, two elliptical bottoms, at least one feed water supply and steam removal connection pipe, an inlet header and an outlet header, a heat-exchange tube bundle connected to the same, wherein number Ntb of heat-exchange tubes in the bundle is selected depending on outer diameter dtb of the heat exchange tubes according to formulae. The technical result of the invention is an increased heat transfer efficiency in the steam generator with a limited number and maximum length of heat exchange tubes, which allows to use tubes employed in the industry.

Description

Technical field [0001] The present invention relates to steam generators, and more particularly to horizontal steam generators used in nuclear power plants. Background technique [0002] Due to the development of reactor installations for nuclear power plants with water-cooled water-moderated power reactors (VVER), two steam generator design methods have been studied: vertical steam generators and horizontal steam generators. In the first case, the steam generator has a vertical pressure vessel and a vertical U-shaped heat exchange tube embedded in the horizontal tube sheet. In the second case, the steam generator has a horizontal pressure vessel and horizontal heat exchange tubes embedded in the vertical inlet header and outlet header of the main loop coolant. At present, these two design concepts have finally developed into perfect but different technological trends. [0003] The present invention relates to an overall horizontal steam generator (steam generator) used in nuclea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B1/02F28D7/00
CPCF22B1/02F22B1/023Y02E30/30Y02P80/15Y02E30/00F22B37/007F22B37/02F28D7/16F28F9/0132F28D2021/0064G21C1/322G21D1/006
Inventor D·A·拉霍夫A·V·萨福罗诺夫
Owner EXPERIMENTAL & DESIGN ORG GIDROPRESS AWARDED THE ORDER OF THE RED BANNER OF LABOUR & CZSR ORDER OF LABOUR