JP2005321125A - Condenser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to easily perform on site assembly in a short time without deforming small tube plates 12 when assembling small tube bundles divided and manufactured in a factory. <P>SOLUTION: When the small tube bundles 20 (20a, 20b) are manufactured, flanges 21 (21a, 21b) are provided on the small tube plates 12 so that the strength of the small tube plates 12 is reinforced, a plurality of bolt holes are formed therein and the small tube plates 12 are bolted to each other to join the small tube bundles to each other. The small tube plates 12 are joined to each other with bolts 22 at a site. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a large condenser used in a power plant or the like, and more particularly to a condenser that is divided and transported and assembled and constructed on site.

  Generally, a condenser is used to cool and condense the steam. FIG. 7 is a diagram illustrating a schematic configuration of a condenser used for condensing steam from a steam turbine in a power plant.

  The condenser 100 includes a plurality of heat transfer tubes 101 through which cooling water flows, tube plates 102 provided at both ends of the heat transfer tubes 101 and supporting the plurality of heat transfer tubes 101, and a plurality of heat transfer tubes 101 inserted therein. A support plate 103 that supports these heat transfer tubes 101, a main body cylinder 104 that is provided so as to contain a plurality of heat transfer tubes 101, and a tube plate 102 that are attached to form a room for cooling water to flow into the heat transfer tubes 101. An inlet water chamber 105 and an outlet water chamber 106 forming a room when flowing out from the heat transfer pipe 101 are mainly configured. Hereinafter, a group of the plurality of heat transfer tubes 101 is referred to as a tube bundle.

  A connecting body 107 is connected to the main body body 104 so as to be connected to a steam turbine (not shown) via a turbine connecting section 108.

  In the condenser 100 shown in FIG. 7, a folded water chamber 109 is provided on the left side, and cooling water from the inlet water chamber 105 flows into the folded water chamber 109 through, for example, the upper heat transfer pipe 101, Thereafter, for example, the configuration in the case of flowing through the lower heat transfer tube 101 and flowing out from the outlet water chamber 106 is shown.

  However, there is a configuration in which the inlet water chamber 105 and the outlet water chamber 106 are attached to the left and right tube plates 102 without providing such a folded water chamber 109.

  With such a configuration, the steam from the steam turbine flows into the main body cylinder 104 via the connection body part 107 and exchanges heat with the cooling water flowing in the heat transfer pipe 101. As a result, the steam is cooled and condensed.

  By the way, since the condenser 100 in such a power plant is very large compared with the condenser used for a general purpose, it is difficult to complete the condenser 100 in a factory and to lay it in a plant. There are many cases.

  In such a case, the condenser 100 is manufactured by dividing it at a factory, transported to the site, assembled and completed at the site, and then installed in the plant.

  For example, in Patent Document 1, a short tube bundle formed by fixing a predetermined number of heat transfer tubes having a short length at a factory with a tube plate and a connection plate is formed, and by joining the short tube bundles on site, a predetermined length is obtained. The structure which forms the condenser which consists of a predetermined number is proposed. At this time, the short tube bundles are joined by bolting the connection plates or by welding.

  Further, in Patent Document 2, a small number of heat transfer tubes having a predetermined length are fixed with a tube plate at a factory to form a small number of tube bundles, and these small number of tube bundles are joined together at a local site, thereby forming a condensate having a predetermined length and a predetermined number. A configuration for forming a vessel has been proposed. At this time, a small number of tube bundles are joined by welding the tube plates.

  In addition, when connecting and connecting tube sheets as in Patent Document 2, the tube sheets may be deformed by the heat of welding.

Therefore, in Patent Document 3, the basic arrangement of the heat transfer tubes is arranged in a triangular shape, but the heat transfer tube row closest to the weld line (first heat transfer tube) and the adjacent heat transfer tube row ( A configuration has been proposed in which only the heat transfer tubes in the second row of heat transfer tubes) are arranged in a square arrangement to suppress thermal stress deformation due to welding.
JP 2001-201272 A JP 2002-257492 A JP 2001-272183 A

  However, even the configuration according to Japanese Patent Laid-Open No. 2001-272183 cannot sufficiently suppress thermal deformation due to problems of rigidity of the tube sheet itself and heat input during welding, and a satisfactory result is not always obtained. Not.

  In addition, it is possible to connect the branch plates of the small tube bundles to be connected to connect the small tube bundles. However, in such a case, since the number of the support plates is large, it takes a lot of time to adjust the gap. There is a problem that the assembly work takes time.

  Accordingly, an object of the present invention is to provide a condenser that can be assembled easily and in a short time without deforming the small tube plate.

  In order to solve the above-mentioned problems, the present invention provides a tube sheet which is provided at both ends of a plurality of heat transfer tube groups and which is supported according to a predetermined number and a predetermined arrangement as described in claim 1. In the condenser with the heat transfer tube group supported by each of the small tube plates as a small tube bundle, a flange is provided in advance at the edge of the small tube plate in contact with the other small tube plate, The divided small tube plates are connected to each other by bolts through the flange, and the flange reinforces the strength of the small tube plate.

  Further, in order to solve the above problems, the present invention is provided at both ends of a plurality of heat transfer tube groups and supports according to a predetermined number and a predetermined arrangement as described in claim 2. Dividing the tube plate into a small tube plate, and in a condenser having a bundle of small heat transfer tubes each supported by the small tube plate, the remaining portions except for the edge of the small tube plate in contact with other small tube plates A flange is provided in advance at the edge, the strength of the small tube plate is reinforced by the flange, and deformation when the divided small tube plates are connected by welding is characterized.

    As described above, according to the present invention, the small tube plate is reinforced with strength of the small tube plate and a plurality of bolt holes are formed so that the small tube plates can be bolted together to connect the small tube bundles. Since the flange to be provided is provided, it is possible to connect the small tube plate with a bolt while reinforcing the strength of the small tube plate, thereby suppressing deformation of the small tube plate.

  Moreover, since the flange for reinforcing the strength of the small tube plate is provided around the small tube plate, deformation of the small tube plate when the small tube bundles are connected can be suppressed.

  Embodiments of the present invention will be described with reference to the drawings. 1-3 is a figure which shows the principal part of the condenser which concerns on this invention, FIG. 1 is a front view, FIG. 2 is a side view, FIG. 3 is the fragmentary figure which expanded the A area | region in FIG.

  The heat transfer tube 11 of the condenser 10 is divided into a small tube bundle 20a and a small tube bundle 20b having the same configuration. Hereinafter, the small tube bundle 20a and the small tube bundle 20b are collectively referred to as the small tube bundle 20.

  The small tube bundle 20 is provided with a plurality of heat transfer tubes 11 through which cooling water flows, small tube plates 12 provided at both ends of the heat transfer tubes 11 and supporting the plurality of heat transfer tubes 11, and the plurality of heat transfer tubes 11. A small support plate 13 that supports these heat transfer tubes 11 and flanges 21 (21a, 21b) that are fixed to the small tube plate 12 are provided.

  The flange 21 is provided along one end (end portion on the connecting side) of the small tube plate 12, and a bolt hole is formed in the flange 21.

  With such a configuration, in the factory, the small tube bundles 20a and 20b are manufactured, and a main body cylinder, an inlet water chamber, an outlet water chamber, a connection body portion, and a turbine connection portion that are the same as the conventional structure (not shown) are manufactured.

  These are then transported to the site in parts and assembled on site. Assembling is performed by placing the small tube plates 12 of the small tube bundle 20a and the small tube bundle 20b so as to face each other vertically and inserting the bolts 22 into the bolt holes of the flanges 21a and 21b and tightening them.

  In this way, since the small tube bundles 20a and 20b are connected by the bolts 22, thermal deformation due to welding does not occur as in the prior art.

  Further, since the flange 21 is fixed to the small tube plate 12, the flange 21 also acts as a reinforcing member of the small tube plate 12 to improve the rigidity of the small tube plate 12, and the small tube plate 12 is deformed by a connecting force by the bolt 22 or the like. It is possible to suppress this.

  1 and the like show a case where the flange 21 is provided upright on the water chamber side, but the present invention is not limited to this and may be provided on the main body trunk side.

  Further, a gasket may be interposed on the surface where the flange 21a and the flange 21b abut so that the steam flowing in the main body cylinder does not leak.

  Next, a second embodiment of the present invention will be described. Fig.4 (a) is a front view of the condenser 10 which concerns on this Embodiment, FIG.4 (b) is the side view.

  The condenser 10 according to the present embodiment is substantially the same as the first embodiment, but has a feature in the mounting position of the flange 21.

  That is, the flange 21 in the present embodiment is formed in a substantially “U” shape with a size along the outer periphery of the small tube plate 12 and is fixed to the small tube plate 12. Thereby, the rigidity of the small tube plate 12 is increased.

  The method of fixing the flange 21 to the small tube plate 12 can be fixed by bolting or welding.

  When welding is used, there is a risk of deformation of the small tube plate 12 due to the heat. However, since the small tube plate 12 is already reinforced by the flange 21 when the deformation occurs, the deformation is Be regulated.

  With such a configuration, in the factory, the small tube bundles 20a and 20b are manufactured, and a main body cylinder, an inlet water chamber, an outlet water chamber, a connection body portion, and a turbine connection portion that are the same as the conventional structure (not shown) are manufactured.

  And when assembling the small tube bundle 20a and the small tube bundle 20b on the spot, each small tube plate 12 is welded.

  At this time, even if the small tube plate 12 is about to be deformed by thermal stress due to welding, the flange 21 regulates this, so that deformation of the small tube plate 12 can be suppressed.

  Next, a third embodiment of the present invention will be described. Fig.5 (a) is a front view of the condenser 10 which concerns on this Embodiment, FIG.5 (b) is the side view.

  The condenser 10 according to the present embodiment is substantially the same as the first or second embodiment described so far, but when assembling the small tube bundle 20a and the small tube bundle 20b, each small tube bundle 20a, The gap adjustment of the small support plate 13 at 20b can be easily performed.

  That is, both ends of the heat transfer tube 11 are supported by the small tube plate 12 and supported by the small support plate 13 therebetween.

  The dimensions of each small support plate 13 itself are the same, but when the small tube bundle 20 is placed horizontally, the small tube plate 12 of the small tube bundle 20a and the small tube bundle 20b is brought into contact with each other by bending due to its weight. At the same time, the distance between the opposed small support plates 13 changes, sometimes causing interference, and sometimes opening too much.

  For this reason, in assembling the small tube bundle 20, it is necessary to adjust the gap of the small support plate 13, but such a gap adjustment requires time and effort.

  Therefore, in the present embodiment, a reinforcing member 23 extending in the longitudinal direction of the heat transfer tube 11 is installed between the small tube bundle 20a and the small tube bundle 20b.

  The reinforcing member 23 has, for example, an “H” cross-sectional shape so that the end portion of the small support plate 13 abuts on the plane portion.

  As a result, since the small support plate 13 is supported in contact with the reinforcing member 23, it is not necessary to adjust the gap, and the assembly work can be performed easily and in a short time.

  The present invention does not exclude application of the configurations according to the first and second embodiments described so far, and can be used simultaneously.

  FIG. 6 shows a view in place of FIG. 3 when the reinforcing member 23 according to the present embodiment is provided in the configuration having the flange 21 in the first embodiment.

  In this way, the reinforcing member 23 also supports the small tube plate 12 and the flange 21 so that the deformation of the small tube plate 12 can be more sufficiently suppressed, and the small tube plate due to vibration during operation of the condenser 10 or the like. 12 or the like can be prevented from being deformed.

It is a front view which shows the principal part of the condenser which concerns on description of 1st Embodiment. It is a side view of the condenser in FIG. It is an enlarged view of A area | region in FIG. It is a front view which shows the principal part of the condenser which concerns on description of 2nd Embodiment. It is a front view which shows the principal part of the condenser which concerns on description of 3rd Embodiment. FIG. 4 is an enlarged view showing a main part of another condenser instead of FIG. 3. It is a block diagram of the condenser applied to description of the prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Condenser 11 Heat exchanger tube 12 Small tube plate 13 Small branch plate 20 (20a, 20b Small tube bundle 21 (21a, 21b) Flange 22 Bolt 23 Reinforcement member

Claims (3)

The tube plates provided at both ends of the plurality of heat transfer tube groups and supported according to a predetermined number and a predetermined arrangement are divided into small tube plates, and the heat transfer tubes respectively supported by the small tube plates In a condenser with a group of small tubes,
A flange is provided in advance at the edge of the small tube plate in contact with another small tube plate, and the divided small tube plates are bolted to each other through the flange, and the flange reinforces the strength of the small tube plate. Characteristic condenser. The tube plates provided at both ends of the plurality of heat transfer tube groups and supported according to a predetermined number and a predetermined arrangement are divided into small tube plates, and the heat transfer tubes respectively supported by the small tube plates In a condenser with a group of small tubes,
A flange is provided in advance on the remaining edge portion excluding the edge portion of the small tube plate in contact with the other small tube plate, the strength of the small tube plate is reinforced by this flange, and deformation when the divided small tube plates are connected by welding is performed. A condenser characterized by prevention.   3. The condenser according to claim 1, wherein when the small pipe bundle is joined, the small pipe bundle is joined via a plurality of reinforcing members between the small pipe bundles and in an axial direction thereof.

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