JP2003121087A - Steam generator with economizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lance removing sludge accumulated on a tube plate without reducing the heat exchange performance of a steam generator with an economizer and without causing a problem of thermal fatigue. SOLUTION: This steam generator with the economizer is provided with an inlet water chamber and an outlet water chamber for a primary cooling water in the lower side part of the tube plate of a cylindrical pressure vessel laid vertically, disposed of an inverse-U-shaped tubes communicating between the inlet water chamber and the outlet water chamber in the trunk in the upper part of the tube plate, vertically provided with a partitioning plate in a tube lane between hot-side tubes in the inlet water chamber side and cold-side tubes in the outlet water chamber side of a turn in the top parts of the U-shaped tubes so as to partition the tube plate in the trunk into the hot-side tubes side and the cold-side tubes side, and feeds a secondary cooling water to a region surrounding the cold-side tubes in the trunk. This partitioning plate is provided with an S-cross-section part forming a recessed groove part horizontally extending in the adjacently to the tube plate and facing to the hot-side tubes and the cold-side tubes, and a lancing device insertion part in side parts of the trunk on the extension of the respective recessed grooves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam generator with an economizer, which can easily remove sludge accumulated on a tube sheet by lansing.

[0002]

2. Description of the Related Art An outline of a steam generator with an economizer will be described with reference to FIG. 5, and a partition plate of a conventional steam generator with an economizer will be described with reference to FIG. FIG. 5 is a schematic configuration diagram showing a vertical cross section of the steam generator with an economizer, and FIG.
FIG. 6 is an enlarged configuration explanatory view of a main part of a conventional steam generator with an economizer corresponding to a middle B portion, and FIG.

The steam generator cools the primary cooling water with the secondary cooling water in a light water reactor type reactor, and generally includes a steam generator with an economizer 100 as shown in FIG. An inlet water chamber 11 and an outlet water chamber 12 are provided in the lower portion of the tube plate 1 of the pressure vessel, and the inlet water chamber 11 and the outlet water chamber 12 are connected by an inverted U-shaped U-shaped tube group 2 to form a primary Cooling water flows from the arrows a1 to a2. In addition, in FIG. 5, the U-shaped tube group is illustrated by two U-shaped tubes.
A large number of character tubes are densely arranged.

The secondary cooling water is supplied from the secondary cooling water inlet 7 to the body side above the tube plate 1 which separates the water chambers 11 and 12 side from the body 3 side as shown by an arrow b1, and the U-shaped tube group 2 is formed. Torso 3 to cover
It descends around the wrapper 4 provided inside, and the wrapper 4
Of the U-shaped tube group 2 that circulates around the lower end of the cylindrical tube, and vaporized vapor is taken out from the upper end of the cylindrical pressure vessel as indicated by arrow b2.

In the steam generator with economizer 100, the U-shaped tube group 2 of the primary cooling water is sandwiched between the top folds, and the inlet water chamber 11 side is the first half part of the heat exchange. Since the chamber 12 side is the latter half of the heat exchange, when the cold side pipe group 22 is provided, the secondary cooling water inlet 7 is provided in the cold side pipe group 22 of the trunk 3, and the secondary water supply is provided above the wrapper 4. A weir 8 surrounding the inlet 7 is provided, and the partition plate 6 is provided in the gap between the hot side tube group 21 and the cold side tube group 22 by folding the U-shaped tube group 2 in the wrapper 4, that is, in the tube lane 5. It is provided so as to be vertically fixed to the wrapper 4, and partitions the tube sheet 1 in the body 3 into a hot side tube group 21 side and a cold side tube group 22 side.

Then, the secondary cooling water is first supplied to the region surrounding the cold-side tube group 22 in the body 3 to exchange heat with the primary cooling water of the cold tube group 22 having a relatively low temperature, and thereafter.
The heat exchange efficiency is improved by exchanging heat with the primary cooling water on the hot side tube group 21 side having a relatively high temperature.

There is a steam generator with an economizer 100 in which the secondary cooling water inlet 7 is provided on the side of the body 3, but in any case, a partition plate is provided in the tube lane 5 of the U-tube group 2 of the primary cooling water. 6 is provided to divide the heat exchange area between the U-shaped tube group 2 and the secondary cooling water into the hot side and the cold side.

[0008]

Generally, in a steam generator, heat exchange between primary cooling water and secondary cooling water causes
As shown in FIG. 6A, it is unavoidable that impurities and the like in the secondary cooling water are generated as sludge 30 and accumulated on the tube sheet 1.

Therefore, in a normal steam generator, a lancing device insertion portion 32 is provided on the barrel 3 in accordance with the position of the tube lane 5, which is a space between the hot side tube group 21 and the cold side tube group 22, and the wrapper 4 is provided. The lower end of the above is passed or the wrapper 4 is also provided with an insertion portion, and a lancing device 31 as shown in FIG. 6B is inserted from there to perform lancing.

That is, the lancing device 31 is inserted, high-pressure water c is jetted from the nozzle 31a thereof, and the sludge 30 accumulated on the tube sheet 1 is removed. Note that the nozzle 31a
Shows the one attached at right angles, but the number,
The orientation is set appropriately.

The lancing device insertion portion 32 normally utilizes a maintenance handhole 9 provided on the body 3 as shown in FIG. 5, and the handhole 9 is closed by fastening or welding when the steam generator is in operation. , It can be opened when needed.

However, the steam generator with economizer 100
In the tube lane 5 in the wrapper 4,
As indicated by the two-dot chain line in (a), it is necessary to partition the hot side and the cold side to provide the partition plate 64, so that the tube lane 5 is closed and the lancing device insertion portion 32 is provided.
However, there is a problem in that the lancing device 31 cannot be inserted even if the above-mentioned structure is provided, and the lancing for removing the sludge 30 cannot be performed during normal maintenance except when the economizer-equipped steam generator 100 is disassembled.

However, even if the partitioning plate 64 is mounted with the lower part thereof cut out, lansing can be performed,
Secondary cooling water is mixed between the hot side tube group 21 side and the cold side tube group 22 side, heat exchange efficiency is reduced, and not only the desired performance as a steam generator with an economizer cannot be obtained. There was a risk of causing temperature fluctuations in the surroundings and causing thermal fatigue in the U-shaped tube.

The present invention solves the problems of the conventional steam generator with the economizer as described above, and causes the problem of thermal fatigue of the U-tube without deteriorating the heat exchange performance as the steam generator with the economizer. It is an object of the present invention to provide a steam generator with an economizer that can easily perform lancing to remove sludge accumulated on a tube sheet without causing the above problem.

[0015]

(1) The present invention has been made in order to solve the above-mentioned problems.
As a means of the above, an inlet water chamber and an outlet water chamber of the primary cooling water are provided in the lower part of the tube plate of the vertically placed cylindrical pressure vessel, and the inlet water chamber and the outlet water chamber are provided in the upper shell of the tube plate. An inverted U-shaped U-shaped pipe group that connects the chambers is provided, and a hot side pipe group on the inlet water chamber side and a cold side pipe group on the outlet water chamber side that are folded back at the top of the U-shaped pipe group. A partition plate is provided vertically in the tube lane between and the partition on the tube plate in the cylinder is divided into the hot side tube group side and the cold side tube group side, and the secondary side to the area surrounding the cold side tube group in the cylinder. In the steam generator with an economizer to which cooling water is supplied, the partition plate extends horizontally in the vicinity of the tube plate to form a concave groove portion facing the hot side tube group and a concave groove portion facing the cold side tube group. With an S-shaped cross section, and a lancing device insert is provided on the side of the barrel on each extension of the groove. Be Te providing an economizer with steam generator according to claim.

With the above arrangement, according to the first means,
By inserting a lancing device along each of the recessed grooves formed in the S-shaped cross section, sludge on the entire region of both the hot side tube group and the cold side tube group can be removed by lanceing, and the partition plate is S Since the gap is formed by the cross section, the secondary cooling water on the hot side does not mix with the secondary cooling water on the cold side.

(2) As a second means, an inlet water chamber and an outlet water chamber for the primary cooling water are provided in the lower portion of the tube plate of the vertically arranged cylindrical pressure vessel, and the upper cylinder of the tube plate is provided. An inverted U-shaped U-shaped tube group that connects the inlet water chamber and the outlet water chamber is provided therein, and the hot side tube group and the outlet on the inlet water chamber side of the folded back portion of the U-shaped tube group are provided. A partition plate is provided vertically in the tube lane between the water chamber side and the cold side tube group, and the tube plate in the body is partitioned into the hot side tube group side and the cold side tube group side, and the cold inside the body A steam generator with an economizer in which secondary cooling water is supplied to a region surrounding a side tube group, wherein the partition plate is provided on one side of the cold side tube group or the hot side tube group of the tube lane, A lancing device insertion portion is provided on a side portion of the trunk on an extension of the tube lane. Providing an economizer with steam generators for.

According to the second means, the partition plate can be provided at one side of the cold side tube group or the hot side tube group, and the lancing device is inserted along the tube lane without interfering with the partition plate. It is possible to remove sludge that is open to the tube lane by removing the sludge on the tube sheet on the tube group side where removal of sludge is prioritized.The partition plate may be flat and the lancing device insertion part Since only one place is required, the structure is simple and the structure is easy to manufacture and assemble, and the secondary cooling water on the hot side and the cold side do not mix.

(3) As a third means, an inlet water chamber and an outlet water chamber for the primary cooling water are provided in the lower portion of the tube plate of the vertically arranged cylindrical pressure vessel, and the upper part of the tube plate is provided. An inverted U-shaped U-shaped tube group that communicates between the inlet water chamber and the outlet water chamber is arranged in the body, and a hot side tube group on the inlet water chamber side that is folded back at the top of the U-shaped tube group. A partition plate is provided vertically in the tube lane between the outlet side water chamber side and the cold side tube group, and the tube plate in the body is partitioned into the hot side tube group side and the cold side tube group side,
A steam generator with an economizer in which secondary cooling water is supplied to a region surrounding a cold side tube group in the body, wherein the partition plate is a middle part of the tube lane and a step portion forms the cold side tube of the tube lane. A portion provided near the group and a portion provided near the hot side tube group are connected, and a lancing device insertion portion is provided on a side portion of the trunk on each extension of tube lanes on both sides of the step portion. The present invention provides a steam generator with an economizer.

According to the third means, the tube of the hot side tube group is inserted into the tube lane provided with the partition plate near the cold side tube group up to the step without interfering with the partition plate. Most of the sludge on the plate can be removed by lancing, and in the same way, the lancing device is inserted to the step without interfering with the partition plate in the tube lane where the partition plate near the hot side tube group is provided. As a result, sludge in a large part of the tube plate of the cold side tube group can be removed by lansing, and since the partition plate has a structure connected by steps, there is no gap and secondary cooling on the hot side and cold side. Water does not mix.

(4) As a fourth means, an inlet water chamber and an outlet water chamber for the primary cooling water are provided in the lower portion of the tube plate of the vertically arranged cylindrical pressure vessel, and the inside of the body above the tube plate. Is provided with an inverted U-shaped U-shaped tube group that communicates between the inlet water chamber and the outlet water chamber, and the hot side tube group and the outlet water on the inlet water chamber side at the top of the U-shaped tube group are folded back. A partition plate is provided vertically in the tube lane between the cold side tube group on the room side and the tube plate inside the barrel is partitioned into a hot side tube group side and a cold side tube group side, and a cold side inside the barrel. A steam generator with an economizer in which secondary cooling water is supplied to a region surrounding a tube group, wherein the partition plate has a height part of which is horizontally slidable and separable by the entire width in the vicinity of the tube plate. A slide part having a lancing device insertion part on the side of the body on the extension of the slide part. Provides economizer with steam generator characterized by comprising a position and opening can be inserted a section of the lancing device insert.

According to the fourth means, the slide portion of the partition plate is pulled out from the opening of the lancing device insertion portion, and the lancing device is freely inserted along the tube lane without interfering with the partition plate to thereby insert the hot side tube group. The sludge in the entire area on the tube sheet of No. 1 and the tube sheet of the cold side tube group can be removed by lansing, and the secondary side cooling water on the hot side and the cold side does not mix due to the slide structure of the sliding part of the partition plate.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A steam generator with an economizer according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an enlarged configuration explanatory view showing a main part of a steam generator with an economizer of the present embodiment, which corresponds to a part B in FIG.
Except for the parts shown in FIG. 1, the description is omitted because it is the same as that described in FIG.

In the steam generator with economizer of the present embodiment, the partition plate 61 provided in the tube lane 5 between the hot side tube group 21 and the cold side tube group 22 has its lower end in contact with the tube sheet 1. , S-shaped cross-section portion 6 that draws an S-shape with a width such that its cross section fits in the width of the tube lane 5 near the tube sheet 1
1 ', and the S-shaped cross section 61' forms two recessed groove portions 61a and 61b extending horizontally toward the hot side tube group 21 and toward the cold side tube group 22, respectively. There is.

On the extension of the concave groove portion 61a facing the hot side tube group 21, a hot side lancer insertion portion 33 is provided on the side portion of the body 3 in alignment with the concave groove portion 61a, and the concave side facing the cold side tube group 22 is formed. On the extension of the groove 61b, the cold side lancing device insertion portion 3 is provided on the side portion of the body 3 in alignment with the concave groove portion 61b.
4 are provided.

Incidentally, the lower end of the wrapper 4 is cut out so as to avoid the inserted lancing device if necessary, or the insertion part of the lancing device is opened in accordance with each lancing device insertion part. The same applies to other embodiments described later, and the re-description thereof will be omitted below.

In the economizer-equipped steam generator of the present embodiment configured as described above, when the lancing device 31 as shown in FIG. 6B is inserted from the hot side lancing device insertion portion 33, the lancing device is inserted. 31 can be inserted along the concave groove portion 61a without interfering with the partition plate 61, and sludge on the tube plate 1 of the hot side tube group 21 can be removed by lansing.

Similarly, when the lancing device 31 as shown in FIG. 6B is inserted from the cold side lancing device insertion portion 34, the lancing device 31 is separated by the partition plate 61.
Can be inserted along the recessed groove portion 61b without interfering with, and sludge on the tube sheet 1 of the cold side tube group 22 can be removed by lansing.

Therefore, in the present embodiment, the partition plate 61 is constituted by the S-shaped cross section 61 'without any gap,
There is no possibility of causing the above-mentioned problems due to the mixing of the secondary cooling water on both sides, and the sludge on the tube sheet 1 in both the hot side and the cold side can be removed without any obstacle.

A steam generator with an economizer according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is an enlarged configuration explanatory view showing a main part of the steam generator with an economizer of the present embodiment, which corresponds to a part B in FIG. 5, and is the same as that described in FIG. 5 except for the part shown in FIG. Therefore, the description is omitted.

In the steam generator with an economizer of the present embodiment, the partition plate 62 has its lower end in contact with the tube plate 1 in the tube lane 5, and also has one of the hot side tube group 21 and the cold side tube group 22. 2 is provided closer to the cold side tube group 22 in the case of the example of FIG.
Most of the tube lanes 5 form a space open toward the hot side tube group 21. A hot-side lancing device insertion portion 33 is provided on a side portion of the body 3 on one side of the extension of the tube lane 5.

In the economizer-equipped steam generator of the present embodiment configured as described above, when the lancing device 31 shown in FIG. 6B is inserted from the hot side lancing device insertion portion 33, the partition plate is inserted. Since 62 is provided close to the cold side tube group 22, the tube lane 5 can provide a sufficient space as the insertion path of the lancing device 31, and the lancing device 31 does not interfere with the partition plate 62 and the tube lane 5 Since the tube lane 5 is open to the hot side tube group 21, sludge on the tube sheet 1 of the hot side tube group 21 can be removed by lancing.

That is, in a steam generator with an economizer, the heat flux of heat exchange in the hot side tube group 21 is usually large, sludge is easily generated, and the corrosion potential is high. By removing sludge, a sufficient effect can be obtained as sludge removal in normal maintenance. The partition plate 62 may be a flat plate, and the lancing device insertion part can be installed at one position of the hot side lancing device insertion part 33. Since the structure is simple, the structure can be simplified and the structure can be easily manufactured and assembled, and the above-mentioned problems due to the mixing of the secondary cooling water on the hot side and the cold side do not occur.

When priority is given to the removal of sludge on the cold side depending on the conditions of use of the steam generator with an economizer, the partition plate 62 is provided close to the hot side tube group 21 and is placed on the tube plate 1 of the cold side tube group 22. The sludge may be removed.

A steam generator with an economizer according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is an enlarged configuration explanatory view showing the main part of the steam generator with an economizer of the present embodiment, which corresponds to the horizontal cross section taken along the line AA in FIG. 5, and FIG. The description is omitted because it is the same as that described in.

In the steam generator with economizer of this embodiment, the partition plate 63 provided in the tube lane 5 between the hot side tube group 21 and the cold side tube group 22 has its lower end in contact with the tube sheet 1. , A portion of the cold side partition plate 63a provided close to the cold side pipe group 22 and a portion of the hot side partition plate 63b provided close to the hot side pipe group 21 in the middle in horizontal section. Split,
It is assumed that the space between them is connected by a step 63c.

In the portion of the cold side partition plate 63a, the tube lane 5 forms a space open to the hot side tube group 21, and the side of the body 3 on the extension side of the tube lane 5 is abutted. The portion is provided with a hot side lancing device insertion portion 33.

Similarly, in the part of the partition plate 63b on the hot side, the tube lane 5 forms a space open to the cold side tube group 22, and the tube on the side of the extension of the tube lane 5 on the abutting side. A cold-side lancing device insertion portion 34 is provided on the side portion of 3.

In the economizer-equipped steam generator of the present embodiment configured as described above, when the lancing device 31 as shown in FIG. 6B is inserted from the hot side lancing device insertion portion 33, the cold side is inserted. Side partition plate 63
Since a is provided close to the cold side tube group 22, the tube lane 5 can provide a sufficient space as an insertion path for the lancing device 31, and the lancing device 31
Can be inserted along the tube lane 5 up to the position of the stepped portion 63c without interfering with the partition plate 63. Further, since the tube lane 5 is opened toward the hot side tube group 21, the direction of the lancing device 31 , Especially the nozzle 31a
Depending on the orientation, the sludge in the most area on the tube sheet 1 of the hot side tube group 21 can be removed by lansing.

Similarly, when the lancing device 31 is inserted from the cold side lancing device insertion portion 34, sludge in a large part on the tube sheet 1 of the cold side tube group 22 can be removed by lancing.

Accordingly, in the present embodiment, the partition plate 63 has a structure in which the cold side partition plate 63a and the hot side partition plate 63b are connected by the stepped portion 63c, so that there is no gap and the hot plate is formed. There is no possibility of causing the problems mentioned above due to the mixing of the secondary cooling water on the cold side and the cold side, and the sludge on the tube sheet 1 in the most areas of both the hot side and the cold side is removed without obstruction. You can

The position of the stepped portion 63c does not necessarily have to be the center as shown in the figure, and is selected according to the position in the range where priority is given to sludge removal on the hot side and the cold side.

A steam generator with an economizer according to a fourth embodiment of the present invention will be described with reference to FIG. Figure 4 (a)
4 is an enlarged configuration explanatory view showing a main part of the economizer-equipped steam generator of the present embodiment, which corresponds to section B in FIG. 5, and FIG. 4B is an enlarged explanatory view of section C in FIG. Except for the portions shown in the figure, the description is omitted because it is the same as that described in FIG.

In the steam generator with economizer of the present embodiment, the partition plate 64 provided in the tube lane 5 between the hot side tube group 21 and the cold side tube group 22 has its lower end in contact with the tube sheet 1. , Lancing device insertion portion 32
A part of the height at the position is a partition plate slide portion 64a which can be slidably separated in the horizontal direction, and is fitted in the groove with the ends of the upper and lower partition plates 64. In addition,
The section and position such as the vertical height and width of the partition plate slide portion 64a are within the range of the opening 32a of the lancing device insertion portion 32 so that the partition plate slide portion 64a can be inserted through the opening 32a.

In the steam generator with economizer of the present embodiment configured as described above, the lancing device insertion portion 32 is opened when the lancing is performed, and then the partition plate slide portion 64a is pulled out from the opening 32a. b)
The slinging device 31 as shown in (1) is inserted, and sludge is removed by lancing.

When the lancing device 31 is inserted from the lancing device insertion portion 32, the partition plates 64 are provided on the upper and lower sides of the partition plate 64, and the left and right sides are open toward the hot side tube group 21 and the cold side tube group 22, respectively. Device 31
Can be freely inserted along the tube lane 5 without interfering with the partition plate 64, and lances sludge in the entire area on the tube plate 1 of the hot side tube group 21 and the tube plate 1 of the cold side tube group 22. Can be removed by.

Therefore, in the present embodiment, the partition plate 64 has a structure in which the partition plate slide portion 64a corresponding to the insertion space of the lancing device 31 can be pulled out, so that the entire area on both the hot side and the cold side is removed. The sludge on the tube sheet 1 can be removed without any hindrance, and by properly performing the groove fitting structure between the partition plate slide portion 64a and the end of the partition plate 64, both sides of the hot side and the cold side can be removed. It is possible to prevent the secondary cooling water from mixing.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the above-mentioned embodiments, and various modifications may be made to the concrete structure within the scope of the present invention. .

[0049]

(1) According to the first aspect of the invention, the steam generator with the economizer is provided in the lower part of the tube plate of the cylindrical pressure vessel vertically installed, and the inlet water chamber and the outlet water of the primary cooling water are provided. A U-shaped tube group having an inverted U-shape, which is provided with a chamber and which communicates between the inlet water chamber and the outlet water chamber, is provided in the upper body of the tube sheet, and the top of the U-shaped tube group is folded back. A partition plate is provided vertically in the tube lane between the hot side tube group on the inlet water chamber side and the cold side tube group on the outlet water chamber side, and the hot side tube group side and the cold side tube are placed on the tube sheet in the body. A steam generator with an economizer, which is partitioned into a group side and in which secondary cooling water is supplied to an area surrounding the cold side tube group in the barrel, wherein the partition plate extends horizontally in the vicinity of the tube plate and is the hot side. A groove section facing the tube group and an S-shaped cross section forming a groove section facing the cold side tube group; Since the lancing device insertion portion is provided on the side portion of the body on each extension, the lancing device is inserted along each of the recessed grooves formed in the S-shaped cross section to form the hot side tube group. The sludge on the entire area of both tube plates of the cold side tube group can be removed by lansing, and the partition plate is composed of S-shaped cross sections without gaps, so there is a problem due to the mixing of secondary cooling water on the hot side and cold side. There is no danger of

(2) According to the invention of claim 2, the economizer-equipped steam generator is provided with an inlet water chamber and an outlet water chamber of the primary cooling water in the lower part of the tube plate of the cylindrical pressure vessel vertically installed. An inverted U-shaped U-shaped tube group that connects the inlet water chamber and the outlet water chamber is provided in the upper body of the tube sheet, and the inlet water is turned back at the top of the U-shaped tube group. A partition plate is vertically provided in the tube lane between the hot side tube group on the room side and the cold side tube group on the outlet water chamber side, and the hot side tube group side and the cold side tube group side are placed on the tube sheet in the body. A steam generator with an economizer, in which secondary cooling water is supplied to an area surrounding the cold side tube group in the body, wherein the partition plate is the cold side tube group or the hot side of the tube lane. Lancing provided on one side of the tube group on the side of the trunk on the extension of the tube lane Since the partition plate can be provided to one of the cold side tube group or the hot side tube group, the lancing device can be installed along the tube lane without interfering with the partition plate. It can be inserted and sludge that is open toward the tube lane is prioritized. Sludge on the tube plate on the tube group side can be removed by lansing, and the partition plate can be a flat plate. Since only one part is required, the structure is simple and the structure is easy to manufacture and assemble, and there is no risk of problems due to the mixing of the secondary cooling water on the hot side and the cold side.

(3) According to the invention of claim 3, the economizer-equipped steam generator is provided with an inlet water chamber and an outlet water chamber of the primary cooling water in the lower part of the tube plate of the vertically arranged cylindrical pressure vessel. An inverted U-shaped U-shaped tube group that connects the inlet water chamber and the outlet water chamber is provided in the upper body of the tube sheet, and the inlet water is turned back at the top of the U-shaped tube group. A partition plate is vertically provided in the tube lane between the hot side tube group on the room side and the cold side tube group on the outlet water chamber side, and the hot side tube group side and the cold side tube group side are placed on the tube sheet in the body. A steam generator with an economizer in which secondary cooling water is supplied to a region surrounding the cold side tube group in the barrel, wherein the partition plate is a step portion in the middle of the tube lane of the tube lane. A portion provided near the cold side tube group and a portion provided near the hot side tube group : It is connected, since it is configured such that it includes a lancing device insert portion on the side of the cylinder on each extension of the sides of the tube lane of the stepped portion,
In the tube lane where the partition plate near the cold side tube group is provided, the lancing device can be inserted up to the step without interfering with the partition plate, and most of the area on the tube plate of the hot side tube group can be Sludge can be removed by lansing,
Similarly, in the tube lane where the partition plate near the hot side tube group is provided, the lancing device can be inserted up to the step without interfering with the partition plate, and most of the cold side tube group on the tube plate can be inserted. The sludge within the range can be removed by lansing, and since the partition plate has a structure in which it is connected by step portions, it is configured without a gap, and there is no risk of problems due to mixing of the secondary cooling water on the hot side and the cold side.

(4) According to the invention of claim 4, the steam generator with the economizer is provided with an inlet water chamber and an outlet water chamber of the primary cooling water in the lower portion of the tube plate of the vertically arranged cylindrical pressure vessel. An inverted U-shaped U-shaped tube group that connects the inlet water chamber and the outlet water chamber is provided in the upper body of the tube sheet, and the inlet water is turned back at the top of the U-shaped tube group. A partition plate is vertically provided in the tube lane between the hot side tube group on the room side and the cold side tube group on the outlet water chamber side, and the hot side tube group side and the cold side tube group side are placed on the tube sheet in the body. In the steam generator with an economizer in which secondary cooling water is supplied to a region surrounding the cold side tube group in the barrel, the partition plate has a part of its height in the vicinity of the tube plate. A slide part that can be slid horizontally separated by the entire width is configured, and a lancein is provided on the side of the trunk on the extension of the slide part. Since the slide part is provided with a device insertion part and has a cross section and a position where the opening of the lancing device insertion part can be inserted, the slide part of the partition plate is pulled out from the opening of the lancing device insertion part. And, the lancing device can be freely inserted along the tube lane without interfering with the partition plate, and the sludge in the entire area on the hot side tube group tube sheet and the cold side tube group tube sheet is lanced. It can be removed, and mixing of the secondary cooling water on the hot side and the cold side can be prevented by the sliding structure of the sliding part of the partition plate.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a main part of a steam generator with an economizer according to a first exemplary embodiment of the present invention, which is an enlarged configuration explanatory diagram corresponding to a B part in FIG. 5;

FIG. 2 is an explanatory diagram of a main part of a steam generator with an economizer according to a second exemplary embodiment of the present invention, which is an enlarged configuration explanatory diagram corresponding to part B in FIG.

FIG. 3 is an explanatory diagram of a main part of a steam generator with an economizer according to a third exemplary embodiment of the present invention, which is an enlarged configuration explanatory diagram corresponding to a horizontal cross section taken along the line AA in FIG.

FIG. 4A is an explanatory diagram of a main part of a steam generator with an economizer according to a fourth exemplary embodiment of the present invention, and is an enlarged configuration explanatory diagram corresponding to a B part in FIG. 5; (B) is C in (a)
It is an enlarged explanatory view of a part.

FIG. 5 is a schematic configuration diagram showing a vertical section of a steam generator with an economizer.

6 (a) is an explanatory view of a main part of a conventional steam generator, and is an enlarged configuration explanatory view corresponding to a B part in FIG. 5. FIG.
(B) is an explanatory view of the lancing device.

[Explanation of symbols]

1 tube sheet 2 U-shaped tube group 3 torso 4 rapper 5 tube lane 6 partition boards 7 Secondary cooling water inlet 8 weirs 9 Hand holes 11 Inlet water chamber 12 Outlet water chamber 21 Hot side tube group 22 Cold side tube group 30 sludge 31 Lansing device 31a nozzle 32 Lansing device insertion part 32a opening 33 Hot side lancing device insertion part 34 Cold side lancing device insertion part 61 Partition board 61 'S-shaped section 61a, 61b Recessed groove portion 62 Partition plate 63 Partition plate 63a Cold side partition plate 63b Hot side divider 63c step 64 dividers 64a Partition plate slide 100 Steam generator with economizer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kengo Shimamura             3-1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi             Hishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Kenji Nishida             3-1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi             Hishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Hiro Hirano             3-1-1 Wadasaki-cho, Hyogo-ku, Kobe-shi             Hishi Heavy Industries, Ltd.Kobe Shipyard F-term (reference) 3L065 DA04                 3L103 AA20 BB26 CC02 CC32 DD08                       DD17 DD19 DD42 DD63

Claims (4)

[Claims] 1. An inlet water chamber and an outlet water chamber for primary cooling water are provided in a lower portion of a tube plate of a vertically arranged cylindrical pressure vessel, and the inlet water chamber and the outlet are provided in an upper body of the tube plate. An inverted U-shaped U-shaped tube group that connects between the water chambers is provided, and a hot side tube group on the inlet water chamber side and a cold side tube group on the outlet water chamber side that are folded back at the top of the U-shaped tube group. A partition plate is provided perpendicularly to the tube lane between the tube lane and the tube plate in the barrel to partition the hot side tube group side and the cold side tube group side into two areas to surround the cold side tube group in the barrel. A steam generator with an economizer to which secondary cooling water is supplied, wherein the partition plate extends horizontally in the vicinity of the tube sheet and has a concave groove portion facing the hot side tube group and a concave groove portion facing the cold side tube group. A S-shaped cross-section to be formed and a lancing device insert on each side of the barrel on each extension of the groove A steam generator with an economizer. 2. An inlet water chamber and an outlet water chamber for the primary cooling water are provided in a lower portion of the tube plate of the vertically arranged cylindrical pressure vessel, and the inlet water chamber and the outlet are provided in the upper shell of the tube plate. An inverted U-shaped U-shaped tube group that connects between the water chambers is provided, and a hot side tube group on the inlet water chamber side and a cold side tube group on the outlet water chamber side that are folded back at the top of the U-shaped tube group. A partition plate is provided perpendicularly to the tube lane between the tube lane and the tube plate in the barrel to partition the hot side tube group side and the cold side tube group side into two areas to surround the cold side tube group in the barrel. In the steam generator with an economizer to which the next cooling water is supplied, the partition plate is provided near the cold side tube group or the hot side tube group of the tube lane, and the partition of the trunk on the extension of the tube lane is provided. A steam generator with an economizer, which is provided with a lancing device insertion portion on the side. 3. An inlet water chamber and an outlet water chamber for primary cooling water are provided in a lower portion of a tube plate of a vertically arranged cylindrical pressure vessel, and the inlet water chamber and the outlet are provided in a body above the tube plate. An inverted U-shaped U-shaped tube group that connects between the water chambers is provided, and a hot side tube group on the inlet water chamber side and a cold side tube group on the outlet water chamber side that are folded back at the top of the U-shaped tube group. A partition plate is provided perpendicularly to the tube lane between the tube lane and the tube plate in the barrel to partition the hot side tube group side and the cold side tube group side into two areas to surround the cold side tube group in the barrel. A steam generator with an economizer to which the next cooling water is supplied, wherein the partition plate is provided in the middle of the tube lane by a step portion near the cold side tube group of the tube lane, and the hot side tube group. It is connected to the part provided nearer to each of the tube lanes on both sides of the step. A steam generator with an economizer, comprising a lancing device insertion portion on a side portion of the trunk on extension. 4. An inlet water chamber and an outlet water chamber of primary cooling water are provided in a lower portion of a tube plate of a vertically arranged cylindrical pressure vessel, and the inlet water chamber and the outlet are provided in an upper body of the tube plate. An inverted U-shaped U-shaped tube group that connects between the water chambers is provided, and a hot side tube group on the inlet water chamber side and a cold side tube group on the outlet water chamber side that are folded back at the top of the U-shaped tube group. A partition plate is provided perpendicularly to the tube lane between the tube lane and the tube plate in the barrel to partition the hot side tube group side and the cold side tube group side into two areas to surround the cold side tube group in the barrel. A steam generator with an economizer to which secondary cooling water is supplied, wherein the partition plate constitutes a slide part in which a part of the height part of the partition plate is slidable and separable horizontally for the entire width. The extension of the part is provided with a lancing device insertion part on the side of the body, and the slide part is inserted with the lancing device insertion part. A steam generator with an economizer, characterized in that it has a cross section and a position where it can be inserted through the opening of the section.