US 10,180,252 B2Granted

Steam generator coolant header with U-shaped tubes of a horizontal heat-exchange bundle and methods of its manufacture

AssigneeJoint Stock Company “Experimental and Design Organization “Gidropress” Awarded the Order of the Red Banner of Labour and CZSR Order of Labour”

InventorsDmitriy Aleksandrovich Lakhov, Aleksey Vladimirovich Safronov, Aleksandr Grigorevich Konyushkov, Dimitriy Evgenevich Alekseev, Aleksandr Evegenevich Gerontiev

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Abstract

This invention relates to electric power industry, and can be used in horizontal steam generators for nuclear power plants (NPP) with a water-water energetic reactor (VVER). We claim a steam generator primary circuit coolant header with U-shaped tubes of a horizontal heat-exchange bundle designed as a thick-wall welded vessel with a perforated central cylindrical part designed so as to allow installation and fastening of a U-shaped heat-exchange tube bundle in the same, wherein the tubes are grouped into banks and separated by vertical inter-tubular tunnels, a lower cylindrical part designed so as to allow welded connection with the steam generator vessel connection pipe, and an upper cylindrical part with a conical adapter to the flange connection of the manhole with a lid, wherein primary circuit header outer diameter Dhead in the central part is selected based on formula. The technical result of the invention involves assurance of strength of the header wall bridges between holes for fastening of heat-exchange tubes and leaktightness of heat-exchange tube connections with the header assuming that the outer surface of the perforated header part is more efficiently (fully) used for tubing.

Claims15

Dependent claims

A steam generator primary circuit coolant header comprising:

a horizontal heat-exchange bundle of U-shaped tubes, wherein the U-shaped tubes are grouped into banks and separated by vertical inter-tubular tunnels;
a thick-wall welded vessel with a central cylindrical part perforated with holes configured for installation and fastening of the heat-exchange bundle therein, the central cylindrical part having a drilling area exceeding an area of holes by at least 20%,
wherein a lower cylindrical part of the welded vessel is configured for welded connection with a steam generator vessel of the steam generator primary circuit,
wherein an upper cylindrical part of the welded vessel comprises a conical adapter configured for flanged connection to a manhole with a lid, and
wherein the primary circuit header has an outer diameter Dhead in the central cylindrical part configured in accordance with the following ratio:
2
·
[
(
d
+
5.5
)
·
(
n
1
+
n
2
)
π
+
100
]
≤
D
head
≤
2
·
[
2
·
(
n
1
-
1
)
·
S
Γ
+
2
2
·
B
2
-
2
4
·
(
n
1
+
n
2
)
·
S
Γ
-
R
Γ
·
tg
⁡
(
π
8
)
+
100
]
where:
Sh is a spacing between U-shaped tubes in the horizontal heat-exchange bundle, mm,
B2 is a width of the heat-exchange bundle opposite to the coolant header, mm,
d is an outer heat-exchange tube diameter, mm,
n1 and n2 respectively indicate a quantity of tubes in the horizontal row of smaller
and bigger heat-exchange tube banks, mm,
Rb is a minimum bend radius of the U shaped tubes, mm, and
holes for fastening of heat-exchange tubes in the perforated central cylinder part of the header are staggered so that a distance between edges of a adjacent holes is not less than 5.5 mm.

81 more elements

A method of manufacture of a steam generator primary circuit coolant header with U-shaped tubes of a horizontal heat-exchange bundle, the method comprising:

fabricating two complex forgings and U-shaped heat-exchange tubes,
assembly and welding of the forgings,
drilling holes in a header central cylindrical part such that a drilling area exceeds an area of holes by at least 20%,
assembly of a heat-exchange bundle of U-shaped heat-exchange tubes by grouping the U-shaped tubes into banks separated by vertical inter-tubular tunnels,
fastening each U-shaped tube in holes of a primary circuit header by rolling and welding on a header internal surface,
wherein a primary circuit header outer diameter Dhead in the central part is selected based on the following ratio:
2
·
[
(
d
+
5.5
)
·
(
n
1
+
n
2
)
π
+
100
]
≤
D
head
≤
2
·
[
2
·
(
n
1
-
1
)
·
S
Γ
+
2
2
·
B
2
-
2
4
·
(
n
1
+
n
2
)
·
S
Γ
-
R
Γ
·
tg
⁡
(
π
8
)
+
100
]
,
where:
Sh is a spacing between heat-exchange tubes in the horizontal heat-exchange bundle, mm,
B2 is a width of the heat-exchange bundle opposite to a coolant header, mm,
d is a outer heat-exchange tube diameter, mm,
n1 and n2 respectively indicate a quantity of tubes in a horizontal row of a smaller
and a bigger heat-exchange tube banks, mm,
Rb is a minimum bend radius of the heat-exchange bundle tubes, mm, and
the drilled holes for fastening of heat-exchange tubes are staggered in the central cylindrical part of the header so that a distance between edges of the adjacent holes is not less than 5.5 mm.

83 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/535,371Filed 16 Nov 2015
Priority: RU 201415042812 Dec 2014
Published: US 2017/0321881 A19 Nov 2017
Granted: 15 Jan 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

F22B 1/023
By exploitation of the heat content of hot heat carriers: with heating tubes for nuclear reactors, as long as they are not classified according to…
B23P 15/26
Making specific metal objects by operations not covered by a single other subclass or a group in this subclass: heat exchangers or the like
F22B 1/02
Methods of steam generation characterised by form of heating method: by exploitation of the heat content of hot heat carriers
F22B 29/064
Construction of tube walls: involving horizontally- or helically-disposed water tubes