KR101654362B1 - DIVIDER PLATE, STEAM GENERATOR WITH THE SAME and LANCING METHOD THEREOF - Google Patents

Abstract

The present invention relates to a steam generator, a steam generator, and a method of cleaning the steam generator. More particularly, the present invention relates to a steam generator and a method of cleaning the same, The separating plate may be configured to be detachably installed on both sides of the housing so as to be spaced apart from each other in order to secure a space for the cleaning robot to be cleaned during the cleaning operation inside the housing, It is possible to maximize the working space by separating and separating a part of the separator plate which separates the economizer area during the cleaning operation of the separator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator, a steam generator,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a steam generator, a steam generator, and a steam generator using the same. More particularly, the present invention relates to a steam generator for generating a maintenance space for removing deposits deposited on a surface of a heat- A separation plate, a steam generator to which the steam generator is applied, and a cleaning method thereof.

Nuclear power plants consist of more than 100 individual functions including Nuclear Steam Supply System (NSSS), which is mainly composed of nuclear reactors, turbine / generator systems that supply steam to the generators, and other auxiliary facilities .

The pressurized water power plant, which is the main type of nuclear power plant in Korea, includes a primary system, a steam generator, a turbine, a secondary system including a generator and a condenser, an engineering safety system for accidents, , Measurement control system, and other auxiliary systems.

The steam generator generates dry steam through the heat exchange with the secondary system circulation water outside the heat transfer tube, while the coolant of the high temperature primary system supplied from the reactor flows through the internal heat transfer tube.

That is, the primary system coolant heated by the reactor is introduced into the steam generator to transfer heat to the secondary system circulation water, the secondary system circulation water is converted into steam, and the turbine is rotated by the converted high-temperature and high-pressure steam .

The secondary system circulation water of the steam generator contains metallic sludge due to corrosion of piping, and various problems may occur due to deposition of sludge on the surface of the heat transfer pipe, the upper part of the heat transfer pipe support, and the upper part of the heat transfer pipe support plate.

In order to solve such a problem, an example of a technique for a lancing equipment for cleaning the inside of a steam generator is disclosed in the following Patent Documents 1 to 2 and others.

Japanese Patent Laid-Open Publication No. 2002-325850 discloses a steam generator having a guide groove on a rail through which a high-pressure water is sprayed through a high-pressure water spray nozzle attached to a nozzle head inserted into a steam generator along a guide groove of a rail, The head is moved to the inside or outside of the steam generator by a cleaning robot driving unit installed outside the manual work, and the rail is divided into several parts so as to approach the side of the fixed cylinder, and the end of the rail can easily enter the side of the fixed cylinder The structure of a sludge cleaning equipment of a steam generator equipped with rollers is disclosed.

Patent Document 2 discloses that a rail guide is installed on both sides of a separator plate of a steam generator to both sides of a fixed cylinder and a rail is guided deeply on both sides of a fixed cylinder by a rail guide and fixed by a wire tensioner on a rail guide and a rail A steam generator washing device for performing a cleaning operation by alternately installing a high-pressure water jet cleaning robot in 45 ° direction and a high-pressure water jet cleaning robot in 30 ° and 90 ° directions after the rail guide and the entire rail are firmly fixed by applying a tension to the wire Is disclosed.

Korean Patent Registration No. 10-0563936 (issued on March 23, 2006) Korean Patent Registration No. 10-0621837 (issued September 19, 2006)

1 and 2 are a plan sectional view and a front sectional view of the steam generator according to the prior art, respectively.

As shown in FIGS. 1 and 2, a divider plate 11 for separating the primary system coolant and the secondary system circulation water is installed in the economizer zone of the steam generator 10.

By providing the separation plate 11 to divide the economizer zone, the primary system coolant and the secondary system circulation water introduced into the steam generator 10 are preheated before the full-scale heat exchange to reduce the temperature difference, The heat exchange efficiency between the system coolant and the secondary system circulating water can be improved.

However, the separator plate 11 is disposed at the center of the handheld 12 on the design of the steam generator 10.

Accordingly, the conventional apparatus for cleaning the steam generator according to Patent Document 1 and Patent Document 2 performs a cleaning operation through a very narrow space on both sides of the separation plate 11 disposed at the center of the manual operation tool 12 Respectively.

As described above, according to the washing apparatus of the conventional steam generator, since the separating plate 11 performs the washing operation in a narrow space, the structure of the washing apparatus and the robot becomes very complicated and difficult to install and manage.

Accordingly, there is a problem that the workability of the cleaning operation using the cleaning device of the conventional steam generator is remarkably lowered.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a separation plate for a steam generator capable of securing a maintenance space so as to remove deposits generated in the steam generator, .

It is another object of the present invention to provide a steam generator separator which can partly separate a part of the steam generator and secure a working space during a cleaning operation through a manual work, And a method of cleaning the same.

In order to achieve the above object, a separator plate of a steam generator according to the present invention is installed in a steam generator to partition an economizer zone for preheating a primary system coolant and a secondary system circulation water before heat exchange, The fixing plate includes a fixing plate fixed to the housing and an engaging plate detachably coupled to the fixing plate to separate the engaging plate from the fixing plate during a maintenance operation to secure a working space.

The fixing plate is formed with an engagement slot corresponding to the shape of the engagement plate, and the engagement plate is drawn out to the outside through a manual operation port formed symmetrically with the lower portion of the housing.

A coupling protrusion that functions as a rail is formed at an upper end and a lower end of one of the coupling slot and the coupling plate and a coupling groove is formed at an upper end and a lower end of the coupling protrusion to engage with the coupling protrusion, And is slidably moved and separated or combined.

The manual operation sphere is provided with a cover for opening or closing the manual operation sphere, and a pressing module for pressing and fixing the slave plate is provided inside the cover.

The pressing module is provided inside the cover and is operated in an expanding and contracting cylinder. The pressing module is provided inside the cylinder and uses the elasticity to stretch the cylinder to generate a pressing force so as to always press the engaging plate toward the housing center portion at a constant pressure. And a pressing member for pressing the pressing member.

In order to achieve the above-mentioned object, the steam generator according to the present invention includes a separation plate and a chamber in which a plurality of heat transfer tubes are installed, and the separation plate is vertically installed at the center, And a housing in which an economizer section for preheating before heat exchange of the circulating water is partitioned.

The steam generator includes a rail guide installed on a side surface of a fixing slot or a coupling slot formed in the fixing plate in a state where the coupling plate is removed during a cleaning operation, a rail provided on the rail guide, And a washing robot including a washing robot for spraying washing water to the inside of the housing, the washing machine being characterized in that the deposit immersed in the inside of the housing is crushed and removed to be cleaned.

According to another aspect of the present invention, there is provided a method of cleaning a steam generator, comprising: (a) separating a coupling plate detachably coupled to a fixing plate fixed to a housing of a steam generator, (b) injecting a washing robot through the space in which the coupling plate is removed in the step (a) and spraying the washing water at a high pressure to crush and remove the deposit immersed in the inside of the housing.

The engaging plate is detachably coupled to an engaging slot formed in the fixing plate and slidably moves along a coupling function portion of a rail function formed on the fixing plate to be drawn out to the outside through a manual opening formed at a position symmetrical to the lower side of the housing. .

And the coupling plate is pressed toward the center of the housing by the cover and the pressing module installed in the manual operation tool so as to be fixed to the fixing plate.

As described above, according to the separator plate of the steam generator according to the present invention, the steam generator applied thereto, and the cleaning method thereof, a part of the separator plate for separating the economizer area during the cleaning operation of the steam generator is separated, An effect that the space can be maximized can be obtained.

Therefore, according to the present invention, it is possible to maximize the cleaning work space through the manual workpiece, thereby improving the workability of the cleaning work, and simplifying the complicated structure of the cleaning apparatus for putting through the narrow space, The effect can be obtained.

1 and 2 are a plan sectional view and a front sectional view, respectively, of a steam generator according to the prior art,
3 is a partially enlarged view of a steam generator to which a separator according to a preferred embodiment of the present invention is applied,
4 is a cross-sectional view taken along the line A-A 'shown in Fig. 3,
5 is a cross-sectional view taken along the line B-B 'shown in FIG. 3,
FIG. 6 is a partially enlarged view of the separating plate and the manual operation tool shown in FIG. 3;
7 is a view illustrating the interior of a manual workpiece before and after the separation of the engagement plate,
FIG. 8 is a process diagram for explaining a stepwise cleaning method of a steam generator according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a separation plate of a steam generator according to a preferred embodiment of the present invention, a steam generator applied thereto, and a cleaning method thereof will be described in detail with reference to the accompanying drawings.

First, the structure of a steam generator to which a separator of a steam generator according to a preferred embodiment of the present invention is applied will be described in detail.

FIG. 3 is a partial enlarged view of a steam generator to which a separator according to a preferred embodiment of the present invention is applied, FIG. 4 is a sectional view taken along line A-A 'of FIG. 3, B 'in Fig.

3, the steam generator 20 to which the separator according to the preferred embodiment of the present invention is applied includes a housing 21 having a chamber in which an outer shape is formed and a heat exchange chamber is formed therein, A plurality of heat transfer tubes 22 through which the primary system coolant moves and a tube support plate 23 for supporting the heat transfer tubes 22 are provided in the lower portion of the housing 21. A pair of hand tools (24) are formed.

In the lower portion of the steam generator 20, the temperature difference is reduced by preheating the primary system coolant and the secondary system circulating water, thereby providing an economizer zone for improving the heat exchange efficiency and extending the heat exchange time. In order to partition the economizer zone And the separating plate 30 is installed in the vertical direction through the central portion of the housing 21.

The separator 30 of the steam generator according to the preferred embodiment of the present invention functions to divide the economizer area and is disposed in the center of the pair of hand tools 24 on the design of the steam generator 20. [

As a result, the separating plate 30 shields the central portion of the manual opening 24 during the cleaning operation in the steam generator 20 through the manual opening 24. Therefore, in the process of performing the cleaning operation in the narrow space, There is a problem that the property is significantly deteriorated.

In order to solve such a problem, in the present embodiment, the separation plate 30 may be provided with a portion corresponding to the pair of hand tools 24 in a detachable manner.

3 to 5, the separator 30 includes a fixing plate 31 fixed in a state of being coupled to the housing 21 and a fixing plate 31 detachably coupled to the fixing plate 31 during a cleaning operation, (32).

As described above, according to the present invention, a part of the separation plate is removably provided, thereby maximizing the working space through the manual work port during the cleaning operation.

For example, FIG. 6 is an enlarged view of a portion of the separating plate and the manual operation tool shown in FIG.

5 and 6, an engaging slot 33 corresponding to the shape of the engaging plate 32 is formed at a lower portion of the fixing plate 31. At the upper and lower ends of the engaging slot 33, 32 can be slidably moved so as to be separated from each other.

The coupling plate 32 is formed in the shape of a rectangular parallelepiped having a length larger than the width and the height and the coupling groove 35 in which the coupling protrusion 34 is engaged is formed at the upper and lower ends of the coupling plate 32 .

The fixing plate 31 and the coupling plate 32 are made of the same material as that applied to the separator plate 11 integrally manufactured in the prior art having heat resistance and corrosion resistance so as to prevent deformation, For example, a material such as iron or an iron alloy.

The coupling protrusions 34 and the coupling grooves 35 are formed so as to have predetermined thicknesses and widths according to the results of experiments so as to prevent deformation, damage, and leakage under high temperature and high pressure conditions when the steam generator 20 is operated. .

For example, the engaging projecting portion 34 and the engaging groove 35 can be manufactured with a thickness and a width corresponding to approximately half of the separating plate thickness.

In this embodiment, the coupling plate 34 is formed on the fixing plate 31 and the coupling groove 35 is formed on the coupling plate 32. However, the present invention is not limited thereto, and the fixing plate 31 The engaging groove 35 is formed in the engaging plate 32 and the engaging protrusion 34 is formed in the engaging plate 32.

Further, the present invention may be modified to form a plurality of coupling protrusions 34 and coupling grooves 35, respectively.

As described above, in the operation of the steam generator according to the present invention, the coupling plate is combined with the fixing plate to form a separation plate, thereby having the same thermal characteristics as the conventional separation plate in which the coupling plate is not used.

According to the present invention, at the time of cleaning operation inside the steam generator, the engaging groove formed at the fixing plate and the engaging plate and the engaging plate can be slid along the engaging protrusion to separate the engaging plate from the fixing plate and can be easily taken out through the manual opening.

For example, FIG. 7 is a view illustrating the interior of a manual workpiece before and after the separation of the binding plate.

7A shows a state in which the coupling plate 32 is coupled to the fixed plate 31 and FIG. 7B shows a state in which the coupling plate 32 is separated from the fixed plate 31 have.

Generally, the handpiece 24 may be formed with a diameter of about 200 mm.

7 (a), when the engaging plate 32 is coupled to the fixing plate 31, the distance between the engaging plate 32 and the heat transfer tube 22 closest to the engaging plate 31 (d) is only about 20 mm.

On the other hand, when the coupling plate 32 is separated from the fixing plate 31, a work space D of about 130 mm can be formed (d <D), as shown in FIG. 7 (b).

6, the manual operation tool 24 is provided with a cover 25 for opening or closing the manual operation tool 24, and the manual operation tool 24 is hermetically sealed inside the cover 25 and the engaging plate 32 A pressing module 26 for generating a pressing force so as to be firmly fixed can be provided.

The pressurizing module 26 is installed in the cylinder 25 and the cylinder 27 installed inside the cover 25 to extend and retract the cylinder 27 using elasticity so as to be coupled to the inside of the housing 21 And a pressing member 28 that generates a pressing force so as to press the plate 32.

The cover 25 can be fixed to the periphery of the handpiece 24 of the housing 21 using a fastening member such as a bolt to close the handpiece 24. [

The cylinder 27 can be manufactured with an outer diameter equal to the diameter of the handpiece 24 so as to be inserted into the handpiece 24 and seal the handpiece 24. [

The pressing member 28 may be provided with a spring member having elasticity.

A cleaning device (not shown) used in the cleaning operation of the steam generator 20 includes a cleaning robot movably installed along the rail. The rail guide for guiding the rail is provided with a coupling slot 33, Or may be installed on the side of the fixing plate 31 around the coupling slot 33. [

Next, a method of cleaning the steam generator according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

FIG. 8 is a process diagram for explaining the cleaning method of the steam generator according to the preferred embodiment of the present invention in stages.

The coupling plate 32 is coupled to the coupling slot 33 provided in the fixing plate 31 in operation of the steam generator 20 in step S10 of FIG.

That is, the coupling plate 32 is slidably moved to the inside of the housing 21 in the state where the coupling protrusions 34 formed at the upper and lower ends of the coupling slot 33 of the fixing plate 31 are coupled to the coupling recesses 35 formed at the upper and lower surfaces, Can be combined.

At this time, due to the operation of the steam generator 20, the chamber inside the housing 21 is maintained at a high temperature and a high pressure, so that the fixing plate 31 and the coupling plate 32 can be maintained in a state of being firmly coupled to each other have.

As a result, leakage through the gap between the fixing plate 31 and the engaging plate 32 can be completely blocked

The manual operation tool 24 is closed by the cover 25 and the pressing module 26 provided inside the cover 25 presses the engaging plate 32 toward the center of the housing 21 by using the elasticity , Separation and disengagement of the coupling plate 32 can be prevented.

As described above, the present invention can have the same thermal characteristics as those of the prior art separator by integrating the coupling plate with the fixing plate during operation of the steam generator.

The operator removes the cover 25 and the pressing module 26 to close the manual opening 24 to open the manual opening 24 and presses the engaging plate 32 And is separated from the fixing plate 31 and is drawn out through the manual opening 24 to perform a cleaning operation.

At this time, the coupling plate 32 can be easily slidably moved along the coupling protrusion 34 of the fixing plate 31 serving as a rail.

When the engaging plate 32 is separated and taken out of the housing 21 as described above, a work space as much as a distance between the heat transfer tubes 22 disposed closest to both sides of the separating plate 30 is formed inside the hand- .

A rail guide is provided on the upper and lower ends of the coupling slot 33 or the side surface of the fixing plate 31 in the vicinity of the coupling slot 33 and the cleaning robot is injected through the rails to spray cleaning water at a high pressure, ) Can be shredded and removed.

Through the above-described process, the present invention can maximize the working space by separating a part of the separating plate for separating the economizer area during the washing operation of the steam generator and drawing it out.

Although the invention made by the present inventors has been described concretely with reference to the above embodiments, the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

The present invention is applied to a technique of maximizing a work space by separating a part of a separator plate that separates the economizer area during a cleaning operation of the steam generator and drawing it out.

20: steam generator 21: housing
22: heat transfer pipe 23: pipe support plate
24: manual opening 25: cover
26: pressure application module 27: cylinder
28: pressing member 30: separating plate
31: fixing plate 32: engaging plate
33: engaging slot 34: engaging projection
35: Coupling groove

Claims (10)

A separation plate for a steam generator, which is installed in a steam generator and divides an economizer zone for preheating a primary system coolant and a secondary system circulation water before heat exchange,
The separator includes a fixed plate fixedly coupled to a housing of the steam generator,
And a coupling plate detachably coupled to the fixed plate
And separating the coupling plate from the fixing plate during a maintenance work to secure a working space. The method according to claim 1,
A coupling slot corresponding to the shape of the coupling plate is formed at a lower portion of the fixing plate,
Wherein the coupling plate is drawn out to the outside through a manual work port formed symmetrically with the lower portion of the housing. 3. The method of claim 2,
A coupling protrusion functioning as a rail is formed at an upper end and a lower end of one of the coupling slot and the coupling plate,
And an engaging groove is formed at an upper end and a lower end of the other one to engage with the engaging protrusion
Wherein the coupling plate is slidably moved along the coupling protrusion to be separated or coupled. 3. The method of claim 2,
Wherein the manual operation sphere is provided with a cover for opening or closing the manual sphere,
And a pressing module for pressing and fixing the coupling plate is provided on the inner side of the cover. 5. The apparatus of claim 4, wherein the pressure module
A cylinder provided inside the cover and operated to expand and contract
And a pressing member installed inside the cylinder and generating a pressing force to press the coupling plate against the central portion of the housing at a constant pressure at all times by stretching the cylinder using elasticity. A separator according to any one of claims 1 to 5,
And a housing in which a chamber in which a plurality of heat transfer tubes are installed is provided and a separator plate is vertically installed at a central portion to partition an economizer section to be preheated before heat exchange between the primary system coolant and the secondary system circulation water is characterized Steam generator. The steam generator as claimed in claim 6, wherein the steam generator
A rail guide provided on a side surface of a fixing slot formed on the fixing plate in a state where the fixing plate is removed during a cleaning operation,
A rail provided on the rail guide,
And a cleaning robot for injecting cleaning water into the housing along the rail and spraying the cleaning water at a high pressure, wherein the deposit immersed in the housing is crushed and removed to be cleaned. A cleaning method of a steam generator to which a separator according to any one of claims 1 to 5 is applied,
(a) separating and releasing the coupling plate detachably coupled from the fixed plate fixed to the housing of the steam generator, and
(b) injecting a washing robot through the space in which the coupling plate is removed in the step (a) and spraying the washing water at a high pressure to crush and remove the deposits deposited in the housing; Method of cleaning generator. 9. The method of claim 8,
Wherein the coupling plate is detachably coupled to a coupling slot formed in a lower portion of the fixing plate,
Wherein the steam generator is slidably moved along the coupling protrusions of the rail function formed at the upper and lower ends of the coupling slot or the coupling plate and is drawn out to the outside through a manual operation port formed at a position symmetrical to the lower both sides of the housing. Way. 10. The method of claim 9,
Wherein the coupling plate is pressed toward the center of the housing by the cover and the pressing module installed in the manual opening so as to be fixed to the fixing plate.

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