KR101169909B1 - Lancing equipment for top of tube sheet of nuclear power plant steam generator - Google Patents

Abstract

PURPOSE: A device for cleaning the upper side of a tube sheet of a steam generator in a nuclear power plant is provided to efficiently remove deposits from the upper side of a tube sheet by spraying water of high pressure using a nozzle. CONSTITUTION: A hand hole flange(110) is attached to a hand hole of a steam generator in a nuclear power plant. A guide rail(120) is installed between a heat pipe and a separation plate of the steam generator in the nuclear power plant. A shaft(130) reciprocates along the guide rail. A nozzle(140) is installed in the end of the shaft and sprays water of high pressure. A first driving unit(150) rotates the shaft.

Description

Steam generator tube sheet upper cleaning device for nuclear power plant {LANCING EQUIPMENT FOR TOP OF TUBE SHEET OF NUCLEAR POWER PLANT STEAM GENERATOR}

The present invention relates to a nuclear power plant steam generator tube sheet upper cleaning device, and more particularly, to cleaning the deposits deposited on the upper tube tube upper part in a nuclear power plant steam generator using high pressure cleaning water. Relates to a device.

In general, the steam generator of the nuclear power plant is a place where the first coolant and the second coolant exchange heat exchanged with the thermal energy generated from the reactor, and are a very important structure that serves as a pressure boundary that prevents leakage of radiation to the outside.

1 is a schematic diagram schematically showing the structure of a nuclear power plant steam generator.

Referring to FIG. 1, the heat exchanger tube 11 is densely arranged inside the steam generator 10. Inside the heat transfer pipe 11, a primary coolant receives heat energy generated from a reactor, and a second circulation water flows outside the heat transfer pipe 11. The primary coolant and the secondary circulating water are exchanged with the steam generator 10 to convert the secondary circulating water into steam of high temperature and high pressure, and the turbine rotates by the steam.

The steam generator 10 enters the high temperature and high pressure water through the inlet 15 and goes out to the outlet 16 through the heat transfer pipe 11, and the separator 13 to increase the heat transfer efficiency inside the steam generator 10. , A fixed cylinder 14 may be installed.

However, in the steam generator 10, sludge accumulates according to the number of years of operation, thereby lowering the thermal efficiency of the heat exchanger tube 11 inside the steam generator 10 and causing damage to the heat exchanger tube 11. A phenomenon that shortens the life occurs. The sludge aggregates iron oxide as a main component and deposits on the surface of the heat transfer tube 11, the upper part of the tube sheet 12, and the like, and causes various problems.

Therefore, a washing apparatus for removing sludge generated inside a nuclear power plant steam generator is used, for example, a chemical cleaning method, an ultrasonic cleaning method, a cleaning method using high pressure water injection, and the like.

Among these, the cleaning method using high pressure water injection is a method of installing a rail into the interior through the hand hole 17 of the steam generator, and inserting and inserting the cleaning head through the rail to supply and spray the high pressure cleaning water. However, in the conventional cleaning method using high pressure water injection, the internal space of the steam generator is very narrow, the movement of the nozzle for injecting the high pressure water is limited, there is a problem that the deposit removal effect is insufficient.

Embodiments of the present invention to provide a nuclear generator steam generator tubesheet upper cleaning device that can effectively remove the deposits on the upper portion of the tube sheet by generating the rotation and transition moment of the nozzle portion.

According to an aspect of the present invention, a hand hole flange is attached to the hand hole of the nuclear power plant steam generator; A guide rail which enters through the hand hole flange, and is installed between the separation plate and the heat pipe of the steam generator steam generator; A shaft installed to linearly reciprocate along the guide rail; A nozzle unit installed at all sides of the shaft to inject high pressure water; A first driving part installed at the rear side of the shaft to rotate the shaft; And a second driving unit for linearly reciprocating the shaft, a nuclear power plant steam generator tube sheet upper cleaning device may be provided.

In addition, it may further include a rail support fixed to the tube sheet of the steam generator of the nuclear power plant to support the lower portion of the guide rail.

The first driving unit may include a first cylindrical part surrounding the shaft rear side; And a first motor rotating the first cylindrical part to rotate the shaft which is a power shaft.

The second driving part may include: a second cylindrical part covering the rear side of the shaft in contact with one surface of the first driving part; A first gear disposed longitudinally along the shaft side; A second gear installed in the second cylindrical portion and engaged with the first gear; And it may include a second motor for rotating the second gear.

According to another aspect of the invention, the hand hole flange is attached to the hand hole of the nuclear power plant steam generator; A guide rail that enters through the handhole flange and is installed between the separator plate and the heat pipe of the steam generator of the nuclear power plant; A first shaft installed to linearly reciprocate along the guide rail; A nozzle unit which is fastened up and down so as to be movable up and down in the seating part installed on all sides of the first shaft and sprays high pressure water; A second shaft having one end fastened to a lower portion of the seating part and spaced apart from each other in parallel with the first shaft, and configured to vertically move the nozzle part by a rotational motion; A first driving part installed at a rear side of the second shaft to rotate the second shaft; And a second driving unit configured to linearly reciprocate the first shaft and the second shaft.

In addition, it may further include a rail support fixed to the tube sheet of the steam generator of the nuclear power plant to support the lower portion of the guide rail.

In addition, the nozzle unit may be arranged in a plurality of nozzles are twisted in a 30 degree direction with respect to the front end of the second shaft.

Embodiments of the present invention can effectively remove the deposits on the upper tube sheet by allowing the nozzle to reciprocate and rotate in a narrow space inside the nuclear power plant steam generator, spraying high pressure water.

In addition, in one hand hole of the steam generator of the nuclear power plant, the nozzle is rotated to inject high pressure water in the 90 degree direction, and in the other hand hole, the high pressure water is sprayed in the 30 degree direction to increase the efficiency of deposit removal. Can be.

1 is a schematic diagram schematically showing the structure of a nuclear power plant steam generator.
Figure 2 is a side view of the nuclear power plant steam generator tubesheet upper cleaning device according to an embodiment of the present invention.
FIG. 3 is an enlarged view illustrating the driving unit in the nuclear power plant steam generator tube sheet upper cleaning device of FIG. 2.
Figure 4 is a side view of the nuclear power plant steam generator tube sheet upper cleaning apparatus according to another embodiment of the present invention.
FIG. 5 is an enlarged view illustrating the seating unit and the nozzle unit in the nuclear power plant steam generator tube sheet upper cleaning device of FIG. 4.
Figure 6 is a utilization of the nuclear power plant steam generator tubesheet upper cleaning device according to embodiments of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Meanwhile, the internal members of the nuclear power plant steam generator 10 described with reference to FIG. 1 are denoted by the same reference numerals.

Figure 2 is a side view of the nuclear power plant steam generator tube sheet upper cleaning device (100, hereinafter tube sheet upper cleaning device) according to an embodiment of the present invention.

Referring to FIG. 2, the tubesheet upper cleaning device 100 includes a hand hole flange 110, a guide rail 120, a shaft 130, a nozzle unit 140, a first driving unit 150, and a second driving unit ( 160).

The tube sheet upper cleaning device 100 is installed inside the steam generator 10 through a hand hole 17 formed at a side of the steam generator 10.

More specifically, the guide rail 120, the shaft 130 and the nozzle unit 140 is disposed inside the steam generator 10, the first driving unit 150 and the second driving unit 160 is a steam generator 10 It is placed outside.

At this time, the handhole flange 110 is fastened to the handhole 17 and serves to fix the tubesheet upper cleaning device 100. For example, the handhole flange 110 and the handhole 17 may be bolted.

The guide rail 120 guides the shaft 130 and the nozzle unit 140 formed on the shaft 130 into the steam generator 10. The guide rail 120 is connected to the hand hole flange 110 and enters into the steam generator 10 through the hand hole flange 110. The guide rail 120 may be installed in a space between the separator plate 13 and the heat pipe 11 of the steam generator 10.

Guide rails 120 may be formed in the longitudinal direction of the rail groove (not shown) to correspond to the outer diameter of the shaft 130, so as to guide the shaft 130 in a stable manner. In addition, the guide rail 120 may be formed of steel, or may be firmly fixed to the entire guide rail 120 using a wire or the like.

On the other hand, the tube sheet upper cleaning device 100 may further include a rail support 121 for supporting the lower portion of the guide rail (120). The rail support 121 is fixedly fastened to the tube sheet 12 and disposed to support the lower portion of the guide rail 120.

For example, when the part corresponding to the steam generator 10 direction in the guide rail 120 is called the front part and the part corresponding to the opposite direction is called the rear part, the rail support 121 is called. The guide rail 120 can be disposed to support the front end.

The shaft 130 is fastened to the guide rail 120 to linearly reciprocate along the pre-installed guide rail 120 as a body in which the nozzle unit 140 is formed. At this time, the shaft 130 is fastened to the guide rail 120 to enable the rotational movement.

For example, the shaft 130 may be formed in a rod shape, and may linearly move along the rail groove formed in the guide rail 120. The shaft 130 may be coupled to the rail groove at a predetermined interval so that the shaft 130 is centered on the shaft. It is possible to rotate by.

In the following description, for convenience of description, the portion corresponding to the steam generator 10 direction in the shaft 130 is referred to as the front part, and the portion corresponding to the opposite direction is referred to as the rear part (of other members). The direction is the same).

The nozzle unit 140 is installed on the entire shaft 130 and serves to inject high pressure water onto the heat transfer tube 11 and the tube sheet 12. For example, the nozzle unit 140 may be configured by installing a plurality of nozzles in a line on all sides of the shaft 130. On the other hand, the nozzle unit 140 is capable of spraying high pressure water having a pressure of 150 to 200 kg / cm ² .

The first driving unit 150 generates a driving force for rotating the shaft 130, the second driving unit 160 generates a driving force for linear reciprocating motion of the shaft 130. The driving of the tube sheet upper cleaning device 100 will be described below.

3 is an enlarged view illustrating the driving unit in the nuclear power plant steam generator tube sheet upper cleaning device 100 of FIG. 2.

Referring to FIG. 3, the first driving part 150 includes a first cylindrical part 151 and a first motor 152. The first driving part 150 may be installed at the rear side of the shaft 130.

For example, the first driving part 150 surrounds the rear side of the shaft 130 with the first cylindrical part 151, and drives the first motor 152 connected to the first cylindrical part 151 to drive the first cylindrical part. By rotating 151, the shaft 130 wrapped around the first cylindrical portion 151 can be configured to rotate.

That is, when the first motor 152 is driven to rotate the first cylindrical portion 151 in the clockwise direction, the shaft 130 rotates in the clockwise direction with the central axis as the axis. At this time, the nozzle unit 140 formed at the entire side of the shaft 130 is rotated in the clockwise direction at the same time as the shaft 130 rotates, and the high pressure water is injected in the clockwise direction, thereby widening the injection region of the high pressure water. The same principle applies to the case in which the shaft 130 rotates in the opposite direction. The second driving unit 160 includes a second cylindrical portion 161, a first gear 162, a second gear 163, and a second motor 164. The second driving unit 160 may be installed at the rear side of the shaft 130 and may be installed in parallel with the first driving unit 150. The second driving unit 160 provides a driving force for the linear reciprocating motion of the shaft 130.

The second cylindrical portion 161 is disposed to surround the rear side of the shaft 130, but the shaft 130 is disposed to enter and exit the central hole of the second cylindrical portion 161. The driving force for the linear reciprocating motion of the shaft 130 is to arrange the first gear 162 in the longitudinal direction along the side surface of the shaft 130 and to fit the first gear 162 on one surface of the second cylindrical portion 161. Physics can be obtained by disposing the second gear 163 and rotating the second gear 163 through the second motor 164.

For example, when the second motor 164 rotates the second gear 163 in one direction, the shaft 130 may move forward as the first gear 162 engaged with the second gear 163 rotates. have. On the contrary, when the second motor 164 rotates the second gear 163 in the other direction, the shaft 130 is reversed as the first gear 162 engaged with the second gear 163 rotates in the opposite direction. can do. The first gear 162 and the second gear 163 may be, for example, a rack gear and a pinion gear, respectively. As described above, it is possible to widen the high-pressure water injection region by moving the shaft 130 forward and backward by the second driving unit 160.

Hereinafter, the nuclear power plant steam generator tube sheet upper cleaning device 200 according to another embodiment of the present invention will be described.

4 is a side view of the nuclear power plant steam generator tube sheet upper cleaning device 200 (hereinafter, the tube sheet upper cleaning device) according to another embodiment of the present invention.

Referring to FIG. 4, the upper tube sheet cleaning device 200 includes a hand hole flange 210, a guide rail 220, a first shaft 230, a nozzle unit 240, a second shaft 250, and a first. The driver 260 and the second driver 270 are included.

Since the handhole flange 210 and the guide rail 220 are the same as or similar to the above-described embodiment, description thereof will be omitted. On the other hand, the tube sheet upper cleaning device 100 may further include a rail support 221 for supporting the lower portion of the guide rail 220. Since the rail support 221 is also the same as or similar to the above-described embodiment, a description thereof will be omitted.

The first shaft 230 is fastened to the guide rail 220 to linearly reciprocate along the pre-installed guide rail 220. Unlike the shaft 130 of the above-described embodiment, the first shaft 230 of the present embodiment does not need to be fastened to allow the rotational movement to the guide rail 220, and the nozzle portion (1) on the first shaft 230. 240 is not formed, and the nozzle part 240 is mounted in the lateral direction through the mounting part 231 which will be described later.

The first shaft 230 further includes a seating portion 231 installed at all sides. The seating unit 231 serves to accommodate the nozzle unit 240 and the second shaft 250 to be described later. For example, the seating part 231 may fasten one side to the front end of the first shaft 230, and fasten the upper part to the guide rail 220 to enable a straight reciprocating motion. Accordingly, when the first shaft 230 moves forward or backward, the seating portion 231 may also move forward or backward together with the first shaft 230.

The nozzle unit 240 is fastened up and down to the front of the seat 231 to spray high pressure water, and the second shaft 250 is fastened to the bottom rear of the seat 231 by rotational motion. It serves to vertically move the nozzle unit 240. This will be described later.

On the other hand, the first driving unit 260 is installed on the rear side of the second shaft 250 provides a driving force for rotating the second shaft 250. Since the first driving unit 260 is the same as or similar to the first driving unit 260 of the above-described embodiment, description thereof will be omitted.

The second driving unit 270 provides a driving force for linearly reciprocating the first shaft 230 and the second shaft 250. While the second driver 160 of the above-described embodiment linearly reciprocates the shaft 130, the second driver 270 of the present embodiment linearly reciprocates both the first shaft 230 and the second shaft 250. The difference is that you exercise. On the other hand, the structure for linearly reciprocating the first shaft 230 and the second shaft 250 is the same as or similar to the second driving unit 160 of the above-described embodiment will be omitted.

Hereinafter will be described with respect to the driving of the tube sheet upper cleaning device 200 according to another embodiment of the present invention.

FIG. 5 is an enlarged view of the seating unit 231 and the nozzle unit 240 in the nuclear power plant steam generator tube sheet upper cleaning device 200 of FIG. 4.

Referring to FIG. 5, the seating portion 231 is fastened to the front end of the first shaft 230 and is formed such that the center portion a extends in the lateral direction. The front end of the second shaft 250 is fastened to the rear surface of the central portion (a), and the nozzle unit 240 is fastened to the front surface of the central portion (a).

On the other hand, the second shaft 250 is disposed spaced apart from the first shaft 230 by a predetermined interval. The second shaft 250 may be formed in a rod shape.

More specifically, the plate formed with a groove for accommodating the front end of the second shaft 250 is fastened to the rear of the center portion a, and the plate moves up and down when the front end of the second shaft 250 rotates.

For example, when the front end rotates clockwise, the plate moves downward, and when the front end rotates counterclockwise, the plate moves upward.

The nozzle unit 240 is fastened to the front of the central portion a, and the lower part of the nozzle unit 240 is connected to the plate. Thus, as the plate moves up and down, the nozzle unit 240 also moves up and down.

The nozzle unit 240 may be arranged in a row or a plurality of two or more nozzles for spraying the high pressure water in a horizontal direction. In addition, the plurality of nozzles may be arranged in a 30 degree direction based on the front end of the second shaft 250. In this case, high pressure water may be injected in the direction of 30 degrees from the nozzles.

Therefore, the high pressure water is injected while the nozzle unit 240 moves up and down by the first driving unit 260 in the tube sheet upper cleaning device 200, and the first shaft 230 and the second driving unit 270. It is possible to change the high-pressure water injection region while the second shaft 250 linearly reciprocates.

Figure 6 is a utilization of the nuclear power plant steam generator tubesheet upper cleaning device according to embodiments of the present invention.

Referring to Figure 6, the nuclear power plant steam generator tubesheet upper cleaning device (100,200) is disposed through the hand hole 17 of the steam generator (10). For example, a tubesheet upper cleaning device 100 may be disposed in one hand hole 17 to rotate the shaft and inject high pressure water in a 90 degree direction, and the second shaft may be rotated in the other hand hole 17. The tube sheet upper cleaning device 200 for spraying high-pressure water in the 30-degree direction may be disposed through the nozzle unit which is movable up and down and the nozzle is arranged in the 30-degree direction. Therefore, it is possible to spray high pressure water efficiently to the whole area | region inside a steam generator.

As described above, the embodiments of the present invention can effectively remove deposits on the upper portion of the tube sheet by causing the nozzle to reciprocate and rotate in a narrow space inside the nuclear power plant steam generator to spray high pressure water.

In addition, in one hand hole of the steam generator of the nuclear power plant, the nozzle is rotated to inject high pressure water in the 90 degree direction, and in the other hand hole, the high pressure water is sprayed in the 30 degree direction to increase the efficiency of deposit removal. Can be.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, many modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

10: steam generator 11: nuclear power plant
12: Tubesheet 13: Separator
14: fixed cylinder 15: inlet
16: outlet 17: handhole
100: tube sheet upper cleaning device
110: hand hole flange 120: guide rail
121: rail support 130: shaft
140: nozzle unit 150: first driving unit
151: first cylindrical portion 152: first motor
160: second drive portion 161: second cylindrical portion
162: first gear 163: second gear
164: second motor
200: tube sheet upper cleaning device
210: hand hole flange 220: guide rail
221: rail support 230: first shaft
231: mounting portion 240: nozzle portion
250: second shaft 260: first driving unit
270: second drive unit

Claims (7)

A hand hole flange 110 attached to the hand hole 17 of the nuclear power plant steam generator 10;
A guide rail 120 that enters through the handhole flange 110 and is installed between the separator plate 13 and the heat transfer pipe 11 of the steam generator 10 of the nuclear power plant;
A shaft 130 installed to linearly reciprocate along the guide rail 120;
A nozzle unit 140 installed at all sides of the shaft 130 to inject high pressure water;
A first driving part 150 installed at a rear side of the shaft 130 to rotate the shaft 130; And
The nuclear power plant steam generator tube sheet upper cleaning device including a second driving unit (160) for linearly reciprocating the shaft (130).
The method of claim 1,
The nuclear power plant steam generator tube sheet upper cleaning device further comprises a rail support (121) fixedly fastened to the tube sheet (12) of the nuclear power plant steam generator (10) to support the lower portion of the guide rail (120).
The method of claim 1,
The first driving unit 150,
A first cylindrical part 151 surrounding the rear side of the shaft 130; And
And a first motor (152) for rotating the shaft (130) which is a power shaft by rotating the first cylindrical portion (151).
The method of claim 1,
The second driving unit 160,
A second cylindrical part 161 which contacts a surface of the first driving part 150 and surrounds a rear side of the shaft 130;
A first gear 162 disposed longitudinally along the side surface of the shaft 130;
A second gear 163 installed on the second cylindrical portion 161 and engaged with the first gear 162; And
The nuclear power plant steam generator tube sheet upper cleaning device including a second motor (164) for rotating the second gear (163).
A hand hole flange 210 attached to the hand hole 17 of the nuclear power plant steam generator 10;
A guide rail 220 entering through the handhole flange 210 and installed between the separator plate 13 and the heat transfer pipe 11 of the steam generator of the nuclear power plant;
A first shaft 230 installed to linearly reciprocate along the guide rail 220;
A nozzle unit 240 that is fastened to the seating portion 231 installed on all sides of the first shaft 230 to spray the high pressure water;
A second shaft 250 having one end fastened to a lower portion of the seating portion 231 and spaced apart from the first shaft 230 by a predetermined interval and vertically moving the nozzle part by a rotational movement;
A first driving part 260 installed at a rear side of the second shaft 250 to rotate the second shaft 250; And
The first generator 230 and the second shaft 250, the nuclear power plant steam generator tube sheet upper cleaning device including a second driving unit (270) for linear reciprocating motion. 6. The method of claim 5,
The nuclear power plant steam generator tube sheet upper cleaning device further comprises a rail support (221) fixed to the tube sheet (12) of the nuclear power plant steam generator 10 to support the lower portion of the guide rail (220).
6. The method of claim 5,
The nozzle unit 240,
A plurality of nozzles are arranged in the direction of 30 degrees relative to the front end of the second shaft (250) nuclear power plant steam generator tube sheet upper cleaning device.

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