JP6207900B2 - Deaerator and its installation method - Google Patents

Description

  Embodiments described herein relate generally to a deaerator installed in a power plant and an installation method thereof.

  In general, in steam power plants, the deaerator is mainly intended to separate and remove non-condensable gases such as nitrogen, oxygen, and carbon dioxide in feed water, that is, deaerate to prevent corrosion and damage to equipment. Equipment.

  The deaerator is a heat exchanger that improves the thermal efficiency of the plant by heating the feed water. The deaerator is installed at a high place to secure the net required suction head (NPSH) of the boiler feed pump (BFP). The deaerator is a large cylindrical device. For example, in the case of a single cylinder type deaerator of a 600 MW to 800 MW class steam power plant, the total length is 50 to 60 m, the outer diameter is 4 to 5 m, and the weight is 150 to 250 ton.

  A type in which a deaeration tank having a function of degassing water supply and a water storage tank for storing the degassed water supply are integrated is referred to as a single body type. Moreover, the type which is divided into the deaeration tank which has the function to deaerate with a deaerator, and the water storage tank which stores water supply is called the twin body type. As such a deaerator, there exist some which were described in patent documents 1 and 2, for example.

JP 2004-116915 A JP 2000-88208 A

  By the way, when a 700 MW class steam power plant is constructed, the deaerator is usually installed outdoors. In this case, the deaerator is stored in a completed form without being divided, and is installed outdoors on a foundation with a large-capacity crane. Depending on the size of the deaerator, an outdoor crane rated at 1,000 tons may be required depending on the working radius and the weight of the deaerator body.

In such an outdoor crane, not only the outdoor crane placement area and the carrier carry-in area for transporting the deaerator, but also occupies a vast site of about 5,000 to 10,000 m ² for assembling the crane boom. There is a need to. However, there is a case where a vast site cannot be secured due to the layout of the equipment and facilities due to the construction status of the power plant.

  On the other hand, when installing a deaerator on an existing deaerator floor in a turbine building, the deaerator can be installed even if a vast site as described above can be secured and an outdoor crane can be installed. Cannot be brought into the floor.

  The problem to be solved by the embodiments of the present invention is that the deaeration can be installed by installing the deaerator from the turbine floor of the turbine building to the adjacent deaerator floor even in a situation where an outdoor crane cannot be used. The purpose is to provide a vessel and its installation method.

  In order to achieve the above object, a method for installing a deaerator according to an embodiment of the present invention includes a turbine floor and a deaerator floor disposed adjacent to each other in a turbine building, and the deaerator from the turbine floor. An overhead crane is installed so as to be movable in the turbine floor, and a plurality of pillars are erected between the turbine floor and the deaerator floor, and the deaerator floor extends from the turbine floor. The deaerator is installed on the deaerator floor by transporting the body of the deaerator to the deaerator floor, and is provided between a plurality of columns provided between the turbine floor and the deaerator floor. A split piece manufacturing process for manufacturing a plurality of split pieces from the deaerator main body to a size that allows passage, and the split pieces that are the same height as the deaerator floor and that are divided into a plurality of pieces are placed. A temporary mount A temporary frame installation step installed on the turbine floor facing the deaerator floor, a divided piece conveyance step of sequentially conveying the plurality of divided pieces to the temporary frame using the overhead crane, and the plurality of divided pieces A pull-in step of attaching the carry-in roller to the deaerator floor sequentially from the temporary mount, and an assembly step of assembling the divided pieces sequentially pulled into the deaerator floor.

Further, in the deaerator according to the embodiment of the present invention, the turbine floor and the deaerator floor are disposed adjacent to each other in the turbine building, and the deaerator floor is provided higher than the turbine floor. A deaerator installed on the deaerator floor, wherein an overhead crane is installed to be movable in the room, and a plurality of pillars are erected between the turbine floor and the deaerator floor. The main body of the vessel is composed of a plurality of divided pieces, and each of these divided pieces is suspended from the overhead crane and can be transported, and is erected between the turbine floor and the deaerator floor. The size is such that it can pass between a plurality of pillars.

  According to the embodiment of the present invention, even in a situation where an outdoor crane cannot be used, the deaerator can be carried in and installed from the turbine floor of the turbine building to the adjacent deaerator floor.

It is a schematic plan view which shows the turbine floor and deaerator floor of the turbine building to which one Embodiment of this invention is applied. It is a schematic side view which shows the turbine building of FIG. FIG. 2 is a schematic elevation view showing the turbine building of FIG. 1. It is process drawing which shows one Embodiment of the installation method of the deaerator based on this invention. It is a front view which shows the division | segmentation state of the main body trunk | drum of the deaerator of FIG. FIG. 6 is a view in the direction of arrow VI in FIG. 5. It is sectional drawing by the VII-VII line of FIG. It is an enlarged view of the VIII part of FIG. It is an elevation view which shows the carrying-in state of the division piece of the main body trunk | drum of a deaerator. It is an elevation view which shows the state which mounted the division piece of the main body trunk | drum of a deaerator on the temporary mount. It is a top view which shows the carrying-in procedure of the division piece of the main body trunk | drum of a deaerator. It is a top view which shows the next carrying-in procedure of the division piece of the main body cylinder of a deaerator. It is a top view which shows the next carrying-in procedure of the division piece of the main body cylinder of a deaerator. It is a top view which shows the next carrying-in procedure of the division piece of the main body cylinder of a deaerator. It is an enlarged elevation view which shows the state in the operation | work which attaches a permanent pedestal to a deaerator.

  Embodiments of a method for carrying in a deaerator according to the present invention will be described below with reference to the drawings.

  In the following embodiments, a single cylinder type will be described as an example. In the following embodiments, a deaerator installed in a 700 MW class steam power plant will be described as an example.

  FIG. 1 is a schematic plan view showing a turbine floor and a deaerator floor of a turbine building to which an embodiment of the present invention is applied. FIG. 2 is a schematic side view showing the turbine building of FIG. FIG. 3 is a schematic elevation view showing the turbine building of FIG. FIG. 4 is a process diagram showing an embodiment of a deaerator installation method according to the present invention.

  As shown in FIGS. 1 to 3, the turbine 1 is a prime mover that converts thermal energy generated by steam from a boiler (not shown) into rotational energy. The generator 2 is directly connected to the turbine 1 and converts rotational energy into electrical energy.

  As shown in FIGS. 2 and 3, the condenser 10 is disposed in the lower part of the turbine 1, cools the steam that has worked in the turbine 1, and condenses it into water. The water is transferred to the deaerator 4 through a pump and a heat exchanger (not shown). As described above, the deaerator 4 separates and removes non-condensable gases such as nitrogen, oxygen, and carbon dioxide in the feed water, and then transfers them again to the boiler via a heat exchanger (not shown).

  In the following description, an area where the turbine 1 and the generator 2 are disposed is referred to as a turbine area A, and an area where the deaerator 4 is disposed is referred to as a deaerator area B. Similarly, the floor on which the turbine 1 and the generator 2 are disposed is referred to as a turbine floor 1A, and the floor on which the deaerator 4 is disposed is referred to as a deaerator floor 1B.

  The turbine area A on the turbine floor 1A is the operating range of the overhead crane 3, but the deaerator area B on the deaerator floor 1B is outside the operating range of the overhead crane 3. A plurality of pillars 6 are erected in the turbine area A of the turbine building, and a plurality of pillars 9 are erected in the deaerator area B.

  By the way, the installation method of the deaerator of this embodiment is roughly the factory production process S10 including the process of dividing | segmenting the main body trunk | drum 4A (FIG. 5) of the deaerator 4 into multiple as shown in FIG. And the divided piece carrying-in process S20 which carries in into the deaerator floor 1B the divided piece divided | segmented into plurality by this factory manufacturing process S10, and the divided piece assembly | attachment process S30 which assembles the divided pieces carried into the deaerator floor 1B And have.

  First, the factory production process S10 will be described.

  FIG. 5 is a front view showing a divided state of the main body body of the deaerator of FIG. 6 is a view in the direction of the arrow VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is an enlarged view of a part VIII in FIG. In the following description, the main body portion excluding components such as the main pedestal 16 is referred to as a main body cylinder 4A of the deaerator 4.

  As shown in FIG. 4, the factory production process S10 includes a split piece production process S11 of the main body barrel 4A, a temporary internal reinforcing member attachment process S12, and an attachment process S13 such as a temporary leg base.

  1) First, the factory production process S10 will be described.

1-1) Division piece manufacturing process S11 of main body trunk 4A
In order to carry the deaerator 4 from the turbine area A to the deaerator floor 1B which is the installation position, among the plurality of columns 8 standing between the turbine floor 1A and the deaerator floor 1B, the columns 8a, It is necessary to pass between 8b. Therefore, in the divided piece manufacturing step S11 of the main body cylinder 4A, the main body cylinder 4A of the deaerator 4 having a size capable of passing between the columns 8a and 8b is manufactured. As will be described later, the divided piece of the main body cylinder 4A of the deaerator 4 passes between the columns 8a and 8b obliquely with respect to the horizontal direction.

  As shown in FIG. 5, as an example of division of the main body cylinder 4 </ b> A of the deaerator 4, in this embodiment, there are five divided pieces 4 a, 4 b, 4 c, 4 d, and 4 e (4 a to 4 e). Here, in the present embodiment, an example in which the main body cylinder 4A is divided into five in the axial direction is shown, but the division example is not limited to the five divisions depending on the size of the main body cylinder 4A and each dimension of the building. It may be a plurality other than.

  Specifically, the division position of the main body cylinder 4A is mainly sized to satisfy the transportation condition, and can be drawn into the deaerator floor 1B from the turbine floor 1A by passing obliquely between the pillars 8a and 8b of the turbine building. Set based on length. As other setting conditions, it is necessary not to set the parts of various structures such as the condensate inlet and the steam inlet as division positions.

1-2) Temporary internal reinforcing member mounting step S12
Metal temporary internal reinforcing members 19 are attached to both ends of the divided pieces 4a to 4e to which the temporary base 14 is attached in order to prevent deformation. In FIG. 7, the example which attached the temporary internal reinforcement member 19 to the division | segmentation piece 4c is shown. The temporary internal reinforcing member 19 is a reinforcing member used when the divided pieces 4a to 4e are transported. Since the temporary internal reinforcing member 19 is unnecessary when the deaerator 4 is operated, it is removed after the installation is completed. In the present embodiment, as will be described later, the temporary base 14 is also used when the divided pieces are installed.

  Incidentally, as shown in FIGS. 6 and 7, the temporary base 14 is supported by the jack-up support 15. The jack-up support 15 is used to adjust the level at the time of groove alignment between the divided pieces 4a to 4e, to adjust the center in the circumferential direction, and to jack up / down the divided pieces 4a to 4e when the main pedestal 16 is attached. Used.

  A jack 18 is set at each of the jack-up points 17 and 17 at the time of jack-up. As described above, the temporary pedestal 14 is made of wood, and if the temporary pedestal 14 is directly jacked up, the temporary pedestal 14 is damaged. Therefore, the jackup support 15 is used. Further, as an advantage of attaching the jack-up support 15 at this position, a temporary internal reinforcing member 19 as shown in FIG. 7 is required at the position where jack-up is performed in order to prevent the split pieces 4a to 4e from being deformed.

  However, the jack-up support 15 supports the temporary base 14 from the bottom, and the temporary internal reinforcing member 19 is already attached to the mounting position of the temporary base 14 via the divided pieces 4a to 4e. There is no need to add a new temporary internal reinforcing member for the jackup support 15.

  The temporary internal reinforcing member 19 is removed after the installation of the deaerator 4 is completed. Since the temporary internal reinforcing member 19 is carried out from the manhole 11, the temporary internal reinforcing member 19 is removed from the inner peripheral surface of the deaerator 4, and then is handled in the deaerator 4 to a size that allows handling to the manhole 11 and removal from the manhole 11. It must be cut and disassembled. A series of work from the removal of the temporary internal reinforcing member 19 to carrying out is work in the deaerator 4 and is dangerous because it is a work in a narrow place. The work needs to be reduced as much as possible.

  From such a viewpoint, the number of the temporary internal reinforcing members 19 can be reduced as much as possible by holding the outer peripheral surfaces of the divided pieces 4 a to 4 e by the concave portions of the temporary base 14. In addition, since the temporary footrest 14 and the jack-up support 15 are not fixed to each other, they can be easily attached to and detached from each other, and can be used when installing other deaerators.

1-3) Temporary pedestal mounting step S13
The permanent pedestal 16 shown in FIG. 5 is not attached at the time of factory shipment. The reason is as follows. That is, it is necessary to attach the installation surface of the main pedestal 16 horizontally to the deaerator floor 1B. Therefore, after the alignment and welding of all the divided pieces 4a to 4e are completed and the main body cylinder 4A is completed, the main pedestal 16 is attached. When the permanent pedestal 16 is attached to the divided pieces 4a to 4e in advance at the factory, when the alignment between the divided pieces 4a to 4e is performed, the heights of the respective permanent pedestals 16 with respect to the deaerator floor 1B. May be different. Therefore, as described above, the main pedestal 16 is not attached when shipped from the factory.

  As shown in FIG. 6, the temporary leg base 14 is attached to both sides in the axial direction of the respective divided pieces 4 a to 4 e that are divided into five in the axial direction of the main body trunk 4 </ b> A, and supports the respective divided pieces 4 a to 4 e. As described above, since the main pedestal 16 is not attached at the time of transportation, a lower waist board for transportation is required. The temporary footrest 14 is made of wood because it does not damage the divided pieces 4a to 4e of the main body trunk 4A during transportation and is made disposable for transportation.

2) Next, the divided piece carrying-in process S20 will be described.
As shown in FIG. 4, the divided piece carrying-in step S20 includes a temporary installation base installation step S21, a carry-in path receiving laying step S22, a divided piece carrying step S23, and a drawing-in step S24 to the deaerator floor. Yes.

2-1) Temporary stand installation step S21
In the temporary mount installation step S21, the temporary mount 5 for carrying in the deaerator is assembled and installed on the turbine floor 1A facing the deaerator floor 1B. The temporary mount 5 has the same height as the deaerator floor 1B and places any one of the divided pieces 4a to 4e divided into a plurality of pieces, and the divided pieces 4a to 4e are placed on the deaerator floor 1B. Used for temporary placement when retracted into the.

  The temporary mount 5 is supported by these four pillars, including two pillars 5a standing upright, pillars 8a and 8b standing between the turbine floor 1A and the deaerator floor 1B. The base plate 5b is provided. In the temporary mount 5, the two columns 5 a are arranged on the vertical extension lines of the columns 7 a and 7 b among the plurality of columns 7. Thereby, the intensity | strength of the temporary mounting base 5 can be raised by receiving the load of the temporary mounting base 5 with pillar 7a, 7b and pillar 8a, 8b.

  The temporary mount 5 is removed after the installation of the deaerator 4 is completed. The temporary mount 5 is used only during installation. Except when the deaerator 4 is installed, the temporary mount 5 is removed, and the removed place is used as a temporary storage place for equipment.

2-2) Carry-in cradle laying step S22
Next, the carrying-in route receiving base laying step S22 will be described with reference to FIG. FIG. 9 is an elevational view showing a state in which the divided pieces of the main body cylinder of the deaerator are carried in.

  As shown in FIG. 9, the base 21 is installed in the deaerator floor 1B. The base 21 becomes an obstacle when the divided pieces 4a to 4e are retracted, assembled and installed. Therefore, according to the height of the base 21, the carry-in path cradle 20 is laid on the transport path of the divided pieces 4 a to 4 e.

2-3) Division piece conveyance process S23
Further, the divided piece conveying step S23 will be described with reference to FIG. FIG. 10 is an elevational view showing a state where the divided pieces of the main body of the deaerator are placed on a temporary mount.

  In the divided piece conveying step S23, the divided pieces 4a to 4e are suspended and conveyed by the overhead crane 3, and are placed on the temporary mount 5 as shown in FIG.

  Specifically, since the deaerator area B where the deaerator 4 is installed is outside the operating range of the overhead crane 3, a tool for transporting the divided pieces 4a to 4e from the temporary mount 5 to the installation position. As described above, the carry-in roller 22 is used. On the carry-in roller 22, the jackup support 15 is placed in advance. At this time, the divided pieces 4a to 4e are aligned with the positions of the temporary leg bases 14 installed at two positions in the axial direction. The divided pieces 4 a to 4 e are conveyed one by one from the entrance of the turbine building to the temporary mount 5 using the overhead crane 3 and placed on the jack-up support 15.

2-4) Step S24 for drawing into the deaerator floor 1B
The drawing-in process S24 to the deaerator floor 1B will be described with reference to FIGS.

  FIG. 11 is a plan view showing a procedure for carrying in the divided pieces of the main body of the deaerator. FIG. 12 is a plan view showing the next carrying-in procedure of the divided pieces of the main body cylinder of the deaerator. FIG. 13 is a plan view showing the next carrying-in procedure of the divided pieces of the main body cylinder of the deaerator. FIG. 14 is a plan view showing the next carrying-in procedure of the divided pieces of the main body cylinder of the deaerator.

  In the drawing-in step S24 to the deaerator floor 1B, the divided pieces 4a to 4e are sequentially drawn from the turbine area A to the deaerator floor 1B and carried into the installation position.

  Specifically, first, as shown in FIG. 11, in order to pass the split piece 4a between the pillars 8a and 8b, the split piece 4a is inclined and pulled from the turbine area A to the deaerator floor 1B, such as a winch not shown. Pull in using equipment.

  Next, as shown in FIG. 12, the divided piece 4 a is turned in the direction in which it is installed. Here, when the divided piece 4a is turned, the length of the divided piece is determined so as not to interfere with surrounding walls and pillars.

  Further, as shown in FIG. 13, the split piece 4a is pulled to the installation position by using a tension device such as a winch (not shown). Subsequently, the divided pieces 4b to 4e are carried in by the same procedure as described above. FIG. 14 shows a state in which all of the divided pieces 4a to 4e are loaded.

3) Next, the divided piece assembling step S30 will be described.
As shown in FIG. 4, the split piece assembling step S <b> 30 includes a center alignment step S <b> 31 to the installation position, a step S <b> 32 for bringing the split pieces closer together, a groove alignment step S <b> 33 between the split pieces, and welding between the split pieces It has process S34 and permanent installation stand mounting process S35.

3-1) Centering step S31 to the installation position
In the centering step S31 to the installation position, the XYZ coordinate axes of the turbine building are defined as shown in FIG. The axial direction of the turbine 1 and the generator 2 is defined as the X axis, and the direction orthogonal to the X axis is defined as the Y axis. Although not shown, the Z axis is the height direction with respect to the XY plane.

  When installing the deaerator 4, it is necessary to match the center of the deaerator 4 attached in advance with the position of the installation position center 23 in the X and Y directions. The reason is that the parts that are generally attached to the equipment are dimensioned from the equipment center.

  For example, in the case of the deaerator 4, the positions of the steam inlet account 12 and the condensate inlet account 13 are in contact with the piping side. Therefore, in order to correctly align the piping, it is arranged at a dimension determined from the center. It is important that By properly installing the deaerator 4 in the installation position center 23, each component such as the steaming account 12 and the condensing account 13 is naturally arranged at the correct position.

  However, since the deaerator center and the installation position center 23 are matched, it is difficult to adjust the position of the completed and integrated deaerator 4 in terms of weight and size. Therefore, the centers in the XY directions are aligned at the time of the lightly divided pieces. The position adjustment of the center in the Z direction is performed after the main pedestal 16 is attached. In FIG. 14, the marking indicating the center provided in advance on the divided piece 4 c is aligned with the installation position center 23.

3-2) Step S32 for bringing the divided pieces closer together
In step S32 for bringing the divided pieces closer together, the divided piece 4b is moved closer to the divided piece 4c with the divided piece 4c fixed.

3-3) Groove alignment step S33 between divided pieces
In the groove aligning step S33 between the divided pieces, when performing the groove alignment between the divided piece 4c and the divided piece 4b, it is necessary to align the circumferential center between the divided piece 4c and the divided piece 4b. It is necessary to adjust the position in the height direction and the circumferential direction.

  In this case, the jacks 18 and 17 of the jack-up support 15 shown in FIG. 7 are adjusted by jacking up and down with the jack 18.

3-4) Welding step S34 between the divided pieces
In the welding step S34 between the divided pieces, the gap between the divided piece 4c and the divided piece 4b is temporarily fixed using a temporary fixing member (not shown), and then the circumferential welding between the divided piece 4c and the divided piece 4b is performed. Subsequently, the divided pieces 4a, 4d, and 4e are aligned and welded in the same procedure as described above.

3-5) Main pedestal mounting step S35
Next, the permanent pedestal mounting step S35 will be described with reference to FIG. FIG. 15 is an enlarged elevation view showing a state in which the main pedestal is attached to the deaerator.

  3-5-1) As shown in FIG. 15, first, the jack 18 is set at the jack-up points 17 and 17 of the jack-up support 15, and the main body is set to a height at which the main pedestal 16 can be set on the base 21. Jack up the barrel 4A horizontally.

  3-5-2) Next, after setting the permanent pedestal 16 on the base 21, the main body trunk 4 </ b> A is jacked down to align the positions of the main body trunk 4 </ b> A and the permanent pedestal 16. Then, in order to level the center in the circumferential direction of the main body barrel 4A, the jack 18 set at the jack-up points 17 and 17 of the jack-up support 15 is adjusted by jacking up and down.

  3-5-3) Further, the main pedestal 16 is welded to the main body trunk 4A.

  3-5-4) The main body trunk 4A is jacked up using the main pedestal 16, and the temporary pedestal 14 and the jack-up support 15 are removed.

  3-5-5) The shim adjustment of the main pedestal 16 is performed to adjust the position in the Z-axis direction and confirm the position in the XY-axis direction, and the installation of the deaerator 4 is completed.

  Thus, in this embodiment, in order to carry in the divided pieces 4a to 4e of the deaerator 4, the deaerator is introduced from the entrance of the turbine building using the overhead crane 3 and the carry-in roller 22 having a capacity of about 200 tons. 4 is installed in the deaerator floor 1B, which is the installation location, and is assembled at the installation position.

  Therefore, according to this embodiment, the deaerator 4 can be carried in and installed from the turbine floor 1A of the turbine building to the adjacent deaerator floor 1B even in a situation where an outdoor crane cannot be used.

(Other embodiments)
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, in the above-described embodiment, the single cylinder type has been described as an example.

  Moreover, although the said embodiment demonstrated the 700MW class steam power plant as object, the scale of a power plant is not limited.

  DESCRIPTION OF SYMBOLS 1 ... Turbine, 1A ... Turbine floor, 1B ... Deaerator floor, 2 ... Generator, 3 ... Overhead crane, 4 ... Deaerator (deaerator main body), 4A ... Main body trunk, 4a-4e ... Divided piece, 5 ... Temporary mount, 6 ... Pillar, 7, 7a, 7b ... Pillar, 8, 8a, 8b ... Pillar, 9 ... Pillar, 10 ... Condenser, 11 ... Manhole, 12 ... Steam input account, 13 ... Condensate Account, 14 ... Temporary pedestal, 15 ... Jack-up support, 16 ... Main pedestal, 17 ... Jack-up point, 18 ... Jack, 19 ... Temporary internal reinforcement member, 20 ... Carry-in stand, 21 ... Base stand, 22 ... Roll-in roller, 23 ... Installation position center, A ... Turbine area, B ... Deaerator area

Claims (7)

A turbine floor and a deaerator floor are arranged adjacent to each other in the turbine building, the deaerator floor is provided higher than the turbine floor, and an overhead crane is installed to be movable in the turbine floor. A plurality of pillars are erected between the turbine and the deaerator floor, and the deaerator main body is transported from the turbine floor to the deaerator floor and installed on the deaerator floor. Because
A split piece manufacturing step of manufacturing a plurality of split pieces from the deaerator body trunk to a size that allows passage between a plurality of pillars erected between the turbine floor and the deaerator floor;
A temporary mount installation step for installing a temporary mount on the turbine floor facing the deaerator floor, which is the same height as the deaerator floor and on which the plurality of divided pieces are placed;
A split piece transporting step of sequentially transporting the plurality of split pieces to the temporary mount using the overhead crane;
A drawing-in step of attaching drawing rollers to the plurality of divided pieces and sequentially drawing from the temporary mount to the deaerator floor;
An assembling step of assembling the divided pieces sequentially drawn into the deaerator floor;
A deaerator installation method characterized by comprising:   The deaerator installation method according to claim 1, wherein the divided piece manufacturing step includes a temporary reinforcing member attaching step of attaching a temporary reinforcing member in each divided piece.   The deaerator installation method according to claim 1 or 2, wherein the divided piece manufacturing step includes a temporary leg base attaching step for attaching a temporary leg base for supporting each divided piece.   The said temporary installation stand installation process arrange | positions the column erected on the said temporary installation stand on the extension line of the support pillar which supports the said turbine floor, The Claim 1 thru | or 3 characterized by the above-mentioned. How to install the deaerator.   The assembling step includes a groove aligning step in which the divided pieces are moved up and down by a jack via a jack-up support and the temporary base, and a groove is aligned between the divided pieces. The deaerator installation method according to any one of 1 to 4.   The said assembly | attachment process includes the permanent pedestal attachment process which attaches the permanent pedestal for installing the assembled said deaerator body trunk | drum on the said deaerator floor | floor. The deaerator installation method according to claim 5. A turbine floor and a deaerator floor are arranged adjacent to each other in the turbine building, the deaerator floor is provided higher than the turbine floor, and an overhead crane is installed to be movable in the turbine floor. And a deaerator installed on the deaerator floor in which a plurality of pillars are erected between the deaerator floor and the deaerator floor,
The deaerator body body is composed of a plurality of divided pieces, each of which is suspended from the overhead crane and can be transported, and is erected between the turbine floor and the deaerator floor. A deaerator having a size capable of passing between a plurality of pillars.

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