JPS60159594A - Heat transfer tube supporting structure - Google Patents

Abstract

PURPOSE:To obtain the heat transfer tube supporting structure, optimum for a gas cooling heat exchanger requesting compactness and vibration resistance by a method wherein the heat transfer tubes are fixed by a plurality sheets of battens provided with semi-circular notches for utilizing them for the supporting members of high-fin tubes. CONSTITUTION:The heat transfer tube 1, equipped with high-fins, is provided with bare tube sections 5 without fins at the supporting position of the tube and is supported by pinching it by the battens 11, provided with the semi-circular notches, made at the positions coinciding with the arrangement of the heat transfer tubes, and half-split cylindrical sleeves 6, attached to said positions, from the upper and lower directions thereof. The heat transfer tube is supported indirectly by the cylindrical sleeves at the bare tube sections of the supporting points, therefore, the bare tube section 5, which acts as a pressure resistance member normally, may be prevented from being scratched or the like by contacting with the battens 11, having small contact areas, by the earthquake or the like.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a heat exchanger tube support structure for a gas-cooled heat exchanger, and in particular to a heat exchanger tube suitable for a heat exchanger in which a heat exchanger tube with high fins is arranged in a cooling duct. Regarding support structures.

[Background of the invention]

A conventional example of a heat exchanger tube support structure in a gas-cooled heat exchanger in which heat exchanger tubes with high fins are arranged in a cooling duct will be described with reference to FIGS. 1 and 2.

Figure 1 shows an example of the structure of a heat exchanger tube l with high fins in which the heat exchanger tube is supported on the outer periphery of the fins.
The heat exchanger tube group is horizontally partitioned by rod-shaped members 2, and the center interval of the heat exchanger tubes in the vertical direction is kept constant, and the upper and lower ends of the heat exchanger tube group are fixed by support fittings 4 provided on the support beams 3. The structure is such that

On the other hand, FIG. 2 shows an example of a structure in which a region without fins (bare tube portion) 5 is provided at the support point of the heat exchanger tube 1 with high fins. A half-split cylindrical sleeve 6 is attached to the cylindrical sleeve 6, which is sandwiched from above and below between a support beam 7 and a presser plate 8, and is fixed with fixing bolts 9. The distance between the centers of the heat exchanger tubes is kept constant by a cylindrical spacer 10 placed between adjacent heat exchanger tubes, and the spacer 10 is attached to the support beam 7 together with the heat exchanger tube 1 by a holding plate 8 and fixing bolts 9. Fixed.

The features of the above-mentioned structural example will be described below. In the structure shown in Fig. 1, rod-shaped members 2 are used as spacing members for the heat exchanger tubes 1, which has the advantage of being able to form a dense group of tubes in the vertical direction, but at the same time, it is difficult to restrain earthquake motion in the horizontal direction. The downside is that it's not enough. In addition, in the structure shown in FIG. 2, the heat exchanger tube 1 is securely fixed with fixing bolts by the spacer 10, the presser plate 8, and the support beam 7 via the half-split cylindrical sleeve 6, so from the viewpoint of restraint against seismic motion. This is considered to be an improvement over the structure shown in Figure 1, but from the perspective of configuring a dense tube group in the upper direction, the size of the support beam 7 becomes larger due to the length of the fixing bolt 9. Therefore, it is difficult to construct a dense tube array.
There is a problem that the equipment becomes larger.

Generally, in gas-cooled heat exchangers, heat exchanger tubes with high fins are often used to make the equipment more compact, and heat exchanger tubes can be arranged in order to increase the flow velocity on the gas side and improve heat transfer performance. Efforts are being made to arrange the devices as closely as possible and further downsize the devices. On the other hand, gas-cooled heat exchangers have various uses, but some of them are particularly important in nuclear power plants, such as for cooling the auxiliary core of nuclear reactors and removing decay heat, and they are used in extremely severe seismic motions. A heat exchanger tube support structure that can withstand even the heat exchangers is required.

Therefore, it is desired that the heat exchanger tube support structure of a gas-cooled heat exchanger be able to reliably support a group of closely arranged heat exchanger tubes in terms of seismic resistance, but there is no conventional structure that satisfies these functions at the same time.

[Purpose of the invention]

The object of the present invention is to use a plurality of band plates with semicircular notches at intervals between the centers of the heat exchanger tubes as a support member for the high fin tube, and to fix the ends with fasteners.
It is an object of the present invention to provide a heat transfer tube support structure suitable for a gas-cooled heat exchanger that is compact and requires earthquake resistance.

[Summary of the invention]

The functional conditions of the heat exchanger tube support structure to be achieved in the present invention are that it can be applied to a dense array of heat exchanger tubes in order to make the heat exchanger more compact, and that the displacement of the heat exchanger tubes in the direction perpendicular to the tube axis is required from the viewpoint of earthquake resistance. It is possible to restrain and reliably support the

First, the first condition, applicability to a dense heat exchanger tube arrangement, can be met by using a strip plate having a width matching a predetermined heat exchanger tube arrangement as a heat exchanger tube support member. That is, the width of the strip generally needs to be made to match the center spacing of the heat exchanger tubes in the vertical direction. In addition, the size of the semicircular notch provided in the band plate is
If the heat exchanger tube is supported by the outer periphery of the fin, the diameter of the fin should be greater than or equal to the outer diameter of the fin, but in this case, if the rigidity of the strip itself becomes a problem due to the large notch, the support position of the heat exchanger tube with fins may be It can be made smaller by providing a bare tube part for support, and the size of the notch may be larger than the outer diameter of the bare tube. Furthermore, when a half-split cylindrical sleeve is provided on the band plate, it is necessary to determine the size of the notch in consideration of the outer diameter of the sleeve.

Next, regarding the second condition, displacement restraint for earthquake resistance, the heat exchanger tubes themselves are supported directly or indirectly through a sleeve in the semicircular notch provided in the strip plate, and the heat exchanger tube group is By fitting or welding the ends of these multiple strip plates to each other to support them,
Displacement of the heat exchanger tube in the direction perpendicular to the tube axis can be suppressed to a small value. In addition, the bending deformation of the strip due to earthquake motion can be suppressed by reducing the size of the semicircular notch as described above, as well as increasing the thickness of the strip to increase the bending rigidity. It is possible.

[Embodiments of the invention]

FIG. 3 shows an elevational view showing an embodiment of the heat exchanger tube support structure according to the present invention. In this figure, a bare tube part 5 without fins is provided at the supporting position of the heat exchanger tube 1 with high fins, and the heat exchanger tube is placed in a semicircle at a position matching the heat exchanger tube arrangement as shown in perspective view cc at the bottom of the figure. It is supported by sandwiching it from above and below with a member in which a half-split cylindrical sleeve 6 is attached to a band plate 11 having a notch. The plurality of strips supporting the heat exchanger tube group in the above manner have four fasteners 12 at the ends.
It is fixed by fitting. The tube bundle assembled in the above manner is fitted with a stopper 12 by means such as welding in a cooling duct (not shown).

In this embodiment, since the heat exchanger tubes are arranged in a staggered manner, semicircular notches are provided on the upper and lower surfaces of the strip plate 11 alternately at a pitch that matches the center spacing of the heat exchanger tubes in the horizontal direction. A half-split cylindrical sleeve 6 larger than the bare hot water is attached by welding. Note that the width of the strip plate 11 is the same as the center spacing of the heat exchanger tubes in the vertical direction.

According to this embodiment, since a plurality of strip plates provided with semicircular notches are used as the heat exchanger tube support member, it is not only applicable to a dense heat exchanger tube arrangement of high fin heat exchanger tubes, but also The heat tube is supported by a half-split cylindrical sleeve that is inserted into the semicircular notch of the band plate, and the end of the band plate is fitted and fixed to the stopper, so the support has earthquake resistance. There is an effect that can be done. Furthermore, since the bare tube part of the heat transfer tube is indirectly supported by the cylindrical sleeve at the support point,
It also has the effect of preventing the bare pipe section, which is normally a pressure-resistant member, from coming into contact with the strip plate with a small contact area due to earthquake motion and causing scratches, etc. 6 In this example, the end of the strip plate is fitted with a stopper. However, it is also possible to use molded copper or the like as the member of the stopper and fix it by welding. Further, regarding the shape of the band plate, the shape of this embodiment may be horizontally divided. Furthermore, although the bare tube support method is used as the heat exchanger tube support method, a fin outer diameter support method may be used as long as the rigidity of the band plate is sufficient.

FIG. 4 shows an elevational view showing a modified example of the heat exchanger tube support structure according to the present invention. In the heat exchanger tube support structure shown in this figure, a strip plate 11 with a half-split cylindrical spacer 6 attached only on one side is sandwiched between a high-finned heat exchanger tube 1 at a bare tube portion 5 from below and an adjacent strip plate. A tube bundle of heat exchanger tubes is constructed by inserting a strip plate 13 that can be fitted in between, and the ends of the strip plate are welded and fixed to the fasteners 12.

In the embodiment described in the previous section, the tube bundle assembly of the heat exchanger tubes had to be carried out approaching each other from the "" side, whereas in this structure example, the arrangement of the heat exchanger tube group was set using an assembly jig at both ends of the heat exchanger tubes. Since the band plates 11 can be inserted from the sides of the tube bundle and the band plates 13 can be fitted together to connect the band plates to each other, it is possible to approach the tube bundle from either side during assembly.

〔Effect of the invention〕

According to the present invention, the heat exchanger tubes are supported using a plurality of strips having semicircular notches, and the strips are fixed together with fasteners, so that even in a dense arrangement of heat exchanger tubes, It also has the effect of providing earthquake-resistant support.

[Brief explanation of the drawing]

FIG. 1 is an elevational view showing an example of a conventional fin outer periphery support heat transfer tube support structure, FIG. 2 is an elevation view showing an example of a conventional bare tube support heat transfer tube support structure, and FIG. FIG. 4 is an elevational view showing a heat exchanger tube support structure showing a modified example of the present invention. 1. Heat exchanger tube with high fins, 2.-- Rod-shaped member, 3.
・Support beam, 4... Support metal fittings, 5... Bare pipe section, 6...
-Half-split cylindrical sleeve, 7...Support beam, 8...Press plate, 9...Fixed pole 1-110...Cylindrical spacer. Agent Patent Attorney Akio Takahashi Zuri 1 (2) Figure 2 (b) Funeral Figure 3 ((1)

Claims (1)

[Claims] (2) In a heat exchanger tube support structure for a gas-cooled heat exchanger in which heat exchanger tubes with high fins are arranged in a cooling duct, a plurality of strips with semicircular notches are provided at intervals between the centers of the heat exchanger tubes. 1. A heat exchanger tube support structure that supports a group of heat exchanger tubes and also fixes the strips at ends of the strips with fasteners.