JP2009275594A - Replacement method of moisture separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate temporary removal or detachment work of a facility apparatus in the periphery of a moisture separator, to eliminate construction of an interfering object for securing a conveyance route, to shorten the replacement period of the moisture separator, and to prevent deterioration of the operation rate of a steam turbine facility. <P>SOLUTION: In a replacement method of the moisture separator 13 having an internal structure 26 equipped with a moisture separating element 21, a deflecting plate 22, and a guide vane 23 disposed in an oblong barrel part 17, and installed in a turbine building, the barrel part 17 is cut in a state of being installed in the turbine building, and the internal structure 26 is removed from inside the barrel part 17. Then, a new internal structure 26 is conveyed near the barrel part 17 component by component, the new internal structure 26 is assembled near the barrel part 17, and thereafter, the new internal structure 26 is inserted and attached in the barrel part 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a moisture separator replacement method for replacing a moisture separator of a steam turbine facility.

  In a boiling water nuclear power plant, steam generated in a nuclear reactor is sent to a steam turbine to rotate the steam turbine, and a generator directly connected to the steam turbine is driven to generate power. As shown in FIG. 6, this steam turbine has a high-pressure turbine 1 and a low-pressure turbine 2 connected to each other, and a moisture separator 3 is installed between the high-pressure turbine 1 and the low-pressure turbine 2.

  The moisture in the steam is removed by the moisture separator 3 to become dry steam, and the steam is supplied to the low-pressure turbine 2 to improve the thermal efficiency. The steam that has finished work in the low-pressure turbine 2 is condensed in the condenser 4 to become condensate.

  The moisture separator 3 is a large and heavy load of several tens of tons. The moisture separator 3 is arranged in the vicinity of a large-sized related device such as the high-pressure turbine 1 and attached with a large-diameter pipe. It is installed inside.

  Further, along with the long-term operation of the nuclear power plant, there are many replacement work of equipment due to deterioration over time, but it may be necessary to further increase the capacity of the equipment. The moisture separator 3 is also included in the large-sized heavy equipment that requires replacement of these aged equipment or equipment for capacity increase.

  In order to replace the moisture separator 3, it is necessary to secure a general access route because the moisture separator is large and heavy. For this purpose, as shown in FIG. 6, the equipment installed around the moisture separator 3 such as the high-pressure turbine 1, the large-diameter attached pipe, the surrounding large steam valve, etc. is temporarily removed, The operation of lifting the moisture separator 3 by the overhead crane 6 disposed on the upper part of the turbine building 5, transporting it to the large material entrance / exit 7 a formed on the floor 7, and moving it on the carry-in / out carriage 8 occurs. (See Patent Document 1).

Or, as shown in FIG. 7, temporary removal of adjacent equipment in the installation chamber of the moisture separator 3, or a part of the wall of the turbine building 5 is temporarily opened to form the opening 9, etc. Interference removal work for carrying in and out the moisture separator 3 is required (see also Patent Document 1).
JP 2000-284091 A

  As described above, the conventional moisture separator replacement method has a small carrying-in / out space, and thus temporarily removes equipment installed around the moisture separator 3 such as the high-pressure turbine 1. After that, it is lifted by the overhead crane 6 and transported to the large carry-in / out entrance 7a, or the open / close route 9 is provided in the wall of the turbine building 5 so that the peripheral equipment and interfering objects are removed and restored. Requires a lot of time and effort.

  Since the conventional replacement method for such a moisture separator 3 is a large-scale and labor-intensive long-term construction, an economic burden and a facility operating rate by stopping the turbine equipment of the nuclear power plant during the construction period Decrease is a big burden.

  The object of the present invention has been made in consideration of the above-mentioned circumstances, eliminates the temporary removal or removal work of the equipment around the moisture separator, and further reduces interference work for securing the carry-in route. Then, it is providing the replacement method of a moisture separator which can shorten a moisture separator replacement construction period and can prevent the fall of the operation rate of steam turbine equipment.

  The present invention relates to a method for replacing a moisture separator in which an internal structure including a moisture separation element, a solse plate, and a guide vane is arranged in a vertically long barrel, and is installed in a turbine building. Is cut off in a state where it is installed in the turbine building, and the internal structure is removed from the inside of the body, and then the new internal structure is carried in parts to the vicinity of the body, and in the vicinity of the body. The new internal structure is assembled, and then the new internal structure is inserted into the body and attached.

  According to the present invention, by replacing only the internal structure in a state where the trunk portion is installed in the turbine building, the equipment installed around the trunk portion of the moisture separator can be temporarily removed or removed. There is no. Furthermore, since the internal structure is carried in for each part and mounted in the assembly body part, interferences at the time of carrying in these parts can be reduced, and interference work for securing the delivery route can be reduced. As a result, the moisture separator replacement period can be shortened, and a reduction in the operating rate of the steam turbine equipment can be prevented.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to these embodiments. FIG. 1 is a side sectional view showing steam turbine equipment of a nuclear power plant to which an embodiment of a moisture separator replacement method according to the present invention is applied. 2 is a cross-sectional view taken along line II-II in FIG.

  As shown in FIGS. 1 and 2, in the steam turbine facility 10 of the nuclear power plant, steam generated in a nuclear reactor (not shown) is sequentially guided to a high-pressure turbine 11 and a low-pressure turbine 12 connected to each other, and these high-pressure turbines 11 and the low pressure turbine 12 rotate to drive a generator (not shown) to generate power. The steam discharged from the high pressure turbine 11 is guided to the low pressure turbine 12 through the moisture separator 13. The moisture separator 13 removes moisture in the steam to form dry steam, thereby improving the thermal efficiency. The steam discharged from the low-pressure turbine 12 is condensed by the condenser 14 to become condensate and supplied to the nuclear reactor.

  The high-pressure turbine 11, the low-pressure turbine 12, the moisture separator 13, the condenser 14, and the like described above are installed in the turbine building 15, and the high-pressure turbine 11 and the low-pressure turbine 12 are installed on the turbine base 16. Further, the moisture separator 13 is attached to a trunk body 18 (see FIG. 3) of a trunk portion 17 of the moisture separator 13 and is suspended from the turbine base 16 via a suspension support 20 connected to the suspension bracket 19. Suspended and supported. A plurality of moisture separators 13 (for example, four moisture separators 13A, 13B, 13C, and 13D) are installed in the vicinity of the high-pressure turbine 11.

  As shown in FIGS. 3 and 4, each moisture separator 13 has an internal structure including a plurality of moisture separation elements 21, a slab plate 22, a plurality of guide vanes 23, and a plurality of support members 24 and 25. An object 26 is arranged in the vertically long trunk portion 17. The body portion 17 is configured by closing an upper opening and a lower opening of a cylindrical body 28 by an upper end plate 27 and a lower end plate 28, respectively.

  Suspension fittings 19 are fixed to the trunk body 18 at a plurality of positions at equal intervals along the circumferential direction in the center in the axial direction. Further, a steam-in account 29 and a steam-out account 30 are provided opposite to each other at the axially central position of the trunk body 18. The steam inlet account 29 is connected to a large-diameter steam inlet pipe, and the steam outlet account 30 is connected to a large-diameter steam outlet pipe (both not shown). Further, a drain outlet account 31 is provided on the lower end panel 28, and a drain pipe (not shown) is connected to the drain outlet account 31.

  The steam flowing into the moisture separator 13 through the steam inlet account 29 from the steam inlet pipe is guided to the moisture separating element 21 by the guide vane 23, and moisture is introduced to the surface of the moisture separating element 21. It is removed by adhering as water droplets. The dry steam from which the moisture has been removed reaches the steam outlet pipe through the steam outlet account 30. Further, water droplets adhering to the moisture separation element 21 become drain and are led to the drain pipe through the drain outlet account 31.

  In addition, manholes 33 and 34 are provided in the trunk body 18 of the trunk portion 17, the manhole 33 is provided in the moisture separators 13A and 13C, and the manhole 34 is provided in the moisture separators 13B and 13D, respectively. The support member 24 of the internal structure 26 is attached to the moisture separation element 21 and holds the moisture separation element 21 in a fixed position on the trunk body 18. The support member 25 is attached to the guide vane 23 and holds the guide vane 23 in a fixed position on the trunk body 18.

  By the way, with the long-term operation of the nuclear power plant, the moisture separator 13 is also subject to replacement work caused by aged deterioration. However, in this moisture separator 13, the internal structure 26 such as the moisture separation element 21 deteriorates over time, but the trunk portion 17 does not deteriorate over time. Therefore, in the replacement method of the moisture separator 13 of the present embodiment, only the internal structure 26 is replaced without replacing the body portion 17 as shown in FIG.

  That is, first, the trunk portion 17 is installed in the turbine building 15, that is, the trunk portion 17 is suspended from the turbine base 16 using the hanging bracket 19 and the suspension support 20, and the steam inlet pipe is connected to the steam inlet account 29. In the state where the steam outlet pipe is connected to the steam outlet account 30 and the drain pipe is connected to the drain outlet account 31, the boundary portion between the trunk body 18 and the lower end panel 28 of the trunk section 17 is cut, and the lower end panel 28 is Separate from the trunk body 18. As a result, a cutting opening 35 is formed at the lower end of the trunk body 18 and a cutting opening 36 is formed at the upper end of the lower end panel 28.

  Next, all or part of the internal structure 26 (moisture separation element 21, sorase plate 22, guide vane 23, support members 24, 25, etc.) installed in the body portion 17 and deteriorated over time is transferred to the body body 18. It is removed from the body 17 through the cutting opening 35.

  Next, the new internal structure 26 is carried into the turbine building 15 for each part (for each of the moisture separation element 21, the slat plate 22, the guide vane 23, and the support members 24, 25), and the trunk portion 17 (the trunk body 18). And it conveys to the building lower area 37 (FIG. 1) near the upper end plate 27). Then, in the building lower area 37, the conveyed parts are assembled to be all or part of the new internal structure 26. At this time, the lower end plate 28 may be integrally assembled with the new internal structure 26.

  Thereafter, the whole or a part of the new internal structure 26 and the lower end plate 28 integrated with the internal structure 26 are placed on a frame (not shown), and the frame is lifted by a chain block or the like. The whole or a part of the new internal structure 26 is inserted into the trunk portion 17 (the trunk body 18 and the upper end plate 27). Then, all or a part of the new internal structure 26 is fixed and attached in the body portion 17, and the cutting port 36 of the lower end plate 28 is connected to the cutting port 35 of the body body 18 by welding or the like. Separator 13 is completed.

  When all or a part of the new internal structure 26 and the lower end panel 28 are not integrally assembled in the building lower area 37, first, all or a part of the new internal structure 26 is mounted on a stand (not shown). It is mounted on the body, lifted or jacked up, inserted into the body 17 (body body 18 and upper end plate 27), and all or part of the new internal structure 26 is fixed to the body 17 and attached. . Next, the lower end plate 28 is placed on a gantry (not shown) and lifted or jacked up, and the cut port 36 of the lower end plate 28 is connected to the cut port 35 of the trunk body 18 by welding or the like.

  Here, the specifications of the new internal structure 26 (particularly, the moisture separation element 21) correspond to the increase in the steam flow rate than the removed internal structure 26 (particularly the moisture separation element 21). It may be. In this case, the capacity of the moisture separator 13 to which the new internal structure 26 is attached is increased from before the removal.

  With the configuration as described above, the following effects (1) to (3) are achieved according to the present embodiment.

  (1) Since only the internal structure 26 is replaced with the new internal structure 26 in a state where the trunk portion 17 is installed in the turbine building 15, it is difficult to remove and restore the moisture separator 13 around it. A suspension support 20 for temporarily removing equipment (high pressure turbine 1, steam inlet piping, steam outlet piping, drain piping, large steam valve, etc.) or suspending the moisture separator 13 from the suspension bracket 19. There is no need to remove it temporarily.

  In addition, since the internal structure 26 is loaded for each part, that is, for each of the moisture separation element 21, the slat plate 22, the guide vane 23, and the support members 24, 25, the internal structure 26 is mounted in the assembly body portion 17. Interferences can be reduced, and for example, interference work for securing a carry-in route, such as temporarily opening a part of the wall of the turbine building 15, can be reduced.

  As a result, the amount of work in the moisture separator replacement work can be reduced, so that the work period can be shortened, and therefore, the reduction in the operating rate of the steam turbine equipment 10 and consequently the nuclear power plant can be prevented.

  (2) Since only the internal structure 26 is replaced in a state where the trunk portion 17 is installed in the turbine building 15, the trunk portion 17 can be diverted. As a result, it is not necessary to discard the steel material of the body portion 17, so that the amount of waste can be reduced.

  (3) In the replacement method of the moisture separator 13 of the present embodiment, when the new internal structure 26 has a specification corresponding to an increase in the steam flow rate compared to the internal structure 26 removed due to deterioration over time. The capacity of the moisture separator 13 can be increased by replacing the internal structure 26.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing steam turbine equipment of a nuclear power plant to which an embodiment of a moisture separator replacement method according to the present invention is applied. Sectional drawing which follows the II-II line | wire of FIG. The longitudinal cross-sectional view which shows the moisture separator of FIG. Sectional drawing which follows the IV-IV line of FIG. It is a figure explaining the replacement method of the moisture separator in FIG. 1, (A) is sectional drawing which shows the attachment state of the internal structure in a trunk | drum, (B) is insertion of an internal structure in a trunk | drum. Sectional drawing which shows a procedure. The conceptual diagram which shows an example in the replacement construction method of the conventional moisture separator. The conceptual diagram which shows the other example in the replacement construction method of the conventional moisture separator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Steam turbine equipment 11 High pressure turbine 12 Low pressure turbine 13 Moisture separator 17 Body 18 Body main body 20 Suspension support 21 Moisture separation element 22 Solase plate 23 Guide vane 26 Internal structure 28 Lower end plate 35, 36 Cut opening 37 Lower part of building Area (near the torso)

Claims (5)

In the replacement method of the moisture separator installed in the turbine building, the internal structure including the moisture separation element, the solse plate and the guide vane is arranged in the vertically long trunk.
The body portion is cut in a state where it is installed in the turbine building, the internal structure is removed from the inside of the body portion, and then the new internal structure is carried into the vicinity of the body portion for each part. A moisture separator replacement method characterized in that the new internal structure is assembled in the vicinity of the section, and then the new internal structure is inserted into the body and attached. The moisture separator replacement method according to claim 1, wherein the cutting of the body portion is cutting of a boundary portion between the body body and the lower end plate constituting the body portion. The moisture separator replacement method according to claim 2, wherein the internal structure is assembled integrally with the lower end plate, and is inserted into the body portion and attached. 3. The moisture separator replacement method according to claim 2, wherein the lower end plate is attached to the trunk body after the internal structure is inserted and attached to the trunk part. The moisture separation element of the new internal structure has a specification that is larger than that before removing the capacity in response to an increase in the steam flow rate than the moisture separation element of the removed internal structure. The moisture separator replacement method according to claim 1.

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