JPH0655056U - Helical coil heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a helical coil heat exchanger capable of ensuring the natural frequency of a tube bundle portion without increasing the diameter thereof. [Structure] A substantially cylindrical shroud 16 is provided in a container 11 into which a heating fluid is introduced, and the inner cylinder 1 is provided inside the shroud 16.
A helical coil heat exchanger provided with a tube bundle unit 17 formed by spirally winding a heat transfer tube 22 around 8
The heat transfer tube 22 is supported by a heat transfer tube support member 21 suspended from a support beam 19 extending from the inner cylinder 18, and the outermost end of the heat transfer tube support member 21 and the outer circumference of the shroud 16 are located at corresponding positions. Protrusions 31 and 32 are formed to contact the inner surface of the shroud and the inner surface of the container, respectively.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a helical coil type heat exchanger, and more particularly, to a helical coil type heat exchanger in which the natural frequency of the tube bundle portion can be secured as required.

[0002]

[Prior art]

 FIG. 4 shows a configuration example of a conventional helical coil heat exchanger. In this heat exchanger 1, the high temperature heating fluid F₁A substantially cylindrical shroud (heat shield) 3 is disposed inside the container 2 into which the gas is introduced, and a tube bundle unit 4 is further disposed inside the shroud 3. The tube bundle unit 4 is formed by spirally winding a heat transfer tube 6 around an inner cylinder 5, and has a low temperature heated fluid F flowing in the heat transfer tube 6.₂Is the heating fluid F ₁ It is designed to be heated by. The tube bundle unit 4 is also supported on the inner wall of the container 2 via support beams 8 and 9 that extend radially from the upper and lower ends of the inner cylinder 5, respectively, to prevent lateral rolling of the heat transfer tube 6 during an earthquake or the like. Through the inner cylinder 5 and the support beams 8 and 9, it is transmitted to the container 2 and absorbed.

[0003]

[Problems to be solved by the device]

 By the way, in recent years, it is necessary to increase the coil height H of the tube bundle unit 4 due to a request for increasing the output of the heat exchanger 1. In this case, simply increasing the length of the tube bundle unit 4 lowers its natural frequency. The natural frequency of the tube bundle unit 4 must be secured at about 20 Hz from the viewpoint of earthquake resistance, and in order to secure the natural frequency in the above-mentioned conventional structure, the rigidity of the inner cylinder 5 must be increased. It was However, in order to increase the rigidity of the inner cylinder 5, the outer diameter D thereof must be significantly increased, which leads to an increase in the radial dimension of the heat exchanger 1, and thus an increase in weight.

Therefore, an object of the present invention is to provide a helical coil heat exchanger capable of ensuring the natural frequency of the tube bundle portion without increasing the diameter of the tube bundle portion.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a tube bundle in which a substantially cylindrical shroud is provided in a container into which a heating fluid is introduced, and a heat transfer tube is spirally wound around the inner cylinder inside the shroud. In a helical coil heat exchanger having a unit, the heat transfer tube is supported by a heat transfer tube support member suspended from a support beam extending from the inner cylinder, and the outermost end of the heat transfer tube support member is also supported. And projections that contact the inner surface of the shroud and the inner surface of the container, respectively, are formed at positions corresponding to each other on the outer circumference of the shroud.

[0006]

[Action]

 According to the above configuration, since the outermost end of the heat transfer tube support member and the outer periphery of the shroud are formed with projections, the middle portion of the heat transfer tube support member is inserted through the shroud during rolling such as an earthquake. The heat transfer tube and the supporting member can be shaken against the inner wall of the container. That is, since the span of support of the tube bundle part to the container can be shortened, the natural frequency required for the tube bundle part is secured without increasing the rigidity of the inner cylinder even when the heat exchanger is enlarged. Can be made.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of a helical coil heat exchanger according to this embodiment. In the figure, reference numeral 11 denotes a container that constitutes the main body of the heat exchanger, and is formed of a substantially cylindrical body 11a and end plates 11b and 11c that close the upper and lower ends of the body 11a. The upper end plate 11b and the lower end plate 11c are respectively provided with an inlet nozzle 12 and an outlet nozzle 13 for a high-temperature heating medium F ₁ (for example, liquid sodium), and at the outer circumference of the body 11a, upper and lower ends thereof are respectively cooled. A water supply inlet 14 and a steam outlet 15 for introducing and discharging the heated fluid F ₂ (for example, water) are formed. A shroud 16 which is a heat shield is attached to the inside of the body 11a. The shroud 16 is formed in a substantially cylindrical shape, and is provided with a predetermined gap from the inner wall of the body 11a.

Inside the shroud 16, a tube bundle unit 17 is further arranged. The tube bundle unit 17 includes an inner cylinder 18 arranged along the center of the body 11a, support beams 19 and 20 radially extending from both upper and lower ends of the inner cylinder 18, and upper and lower support beams 19 and 20. The heat transfer tube support member 21 is installed between the heat transfer tube support member 21 and the heat transfer tube 22 spirally supported by the heat transfer tube support member 21. As shown in FIG. 2, the heat transfer tube support member 21 has a plurality of perforated plates 23, 23 ... Connected in layers. Each perforated plate 23 is suspended from the upper support beam 19 by suspension bolts 24, while the lower end of the perforated plate 23 is shielded from the lower support beam 20 in order to absorb the difference in thermal expansion from the inner cylinder 18. It is structured. The perforated plate 23 is previously formed with through holes 23a penetrating along the longitudinal direction thereof at a predetermined pitch, and the heat transfer tubes 22 are inserted into and supported by these through holes 23a so as to have a spiral shape.

In the present embodiment, of the heat transfer tube support members 21, 21 ... Radially arranged on the outer periphery of the inner cylinder 18 in this manner, the outermost end of a predetermined support member 21 is substantially formed. A trapezoidal protrusion 31 is formed. Here, three projections 31 are formed on four heat transfer tube support members 21 at every 90 ° in the circumferential direction of the inner cylinder 18, and four tube bundle units 17 as a whole are circumferentially four and vertically three. The projections 31, 31 ... Are provided. The height of each projection 31 is made to coincide with the gap size between the heat transfer tube support member 21 and the shroud 16, as shown in the enlarged view of the main part in FIG. 1, and the tips of these projections 31, 31, ... It can contact the inner wall. On the other hand, a protrusion 32 is formed on the outer peripheral wall of the shroud 16 as shown in FIG. The protrusion 32 is formed at a position corresponding to the protrusion 31, and is so shaped that the intermediate portion of the heat transfer tube supporting member 21 is brought into contact with the inner wall of the body 11a via the shroud 16.

Next, assembling of the helical coil type heat exchanger having the above-mentioned configuration will be described.

First, the tube bundle unit 17 is manufactured prior to the assembly of the heat exchanger. That is, the perforated plate 23 is suspended in layers on each upper support beam 19 radially extending from the inner cylinder 18, and the lower end of the perforated plate 23 is connected to the lower support beam 20 in a shear structure. When the heat transfer tube support member 21 is obtained in this manner, the heat transfer tube 22 is then inserted into the insertion holes 23a of the perforated plates 23, 23, and the heat transfer tube 22 is spirally formed around the inner cylinder 18. Get support.

When the assembly of the tube bundle unit 17 is completed, the shroud 16 and the tube bundle unit 17 are sequentially fitted inside the body 11a. At this time, a projection 32 is formed on the outer circumference of the shroud 16, and if the projection 32 collides with a projection on the inner wall of the body 11a, the shroud 16 is rotated to avoid the collision. When the shroud 16 is housed in the body 11a, the projection 32 is brought into contact with the inside of the thick seat 33 formed outside the body 11a in advance to fix the shroud 16. Further, when the tube bundle unit 17 is fitted into the shroud 16, with the projection 31 of the tube bundle unit 17 in contact with the inside of the projection 32 of the shroud 16, the extension ends of the upper and lower support beams 19, 20 are attached to the body 11a. Fix it.

When the shroud 16 and the tube bundle unit 17 are assembled inside the body 11 a in this way, next, the end plates 11 b and 11 c are attached to the upper and lower ends of the body 11 a, and the connecting pipes 25 and 25 are respectively attached to the upper and lower ends of the heat transfer tube 22. 24 connects the steam outlet 15 and the feed water inlet 14.

As described above, in the heat exchanger of this embodiment, the outermost end of the heat transfer tube supporting member 21 and the outer peripheral wall of the shroud 16 are formed with the projections 31 and 32, respectively, to support the heat transfer tube. Since the intermediate portion of the member 21 is brought into contact with the body 11a via the shroud 16, in the event of an earthquake or the like, the intermediate portion of the tube bundle unit 17 can be applied to the body 11a to perform steady rests, and thus the heat exchanger. When the size is increased, the natural frequency required for the tube bundle unit 17 can be secured without increasing the rigidity of the inner cylinder 18 at all. That is, in the conventional structure (Fig. 4), when the heat exchanger is upsized in order to support the tube bundle unit 4 at two positions above and below, the supporting span also becomes longer, and the tube bundle unit 4 has a longer span. The natural frequency cannot be maintained. On the other hand, in the present invention, the supporting span is shortened by hitting the middle part of the tube bundle unit 17 against the body 11a via the shroud 16, and the natural frequency of the tube bundle unit 17 can be easily secured at the required frequency (20 Hz). .

In the above-described embodiment, the protrusions 31 and 32 are formed at four locations on the same horizontal plane and three locations on the vertical plane, respectively. However, it can be set appropriately.

[0017]

[Effect of device]

 In short, according to the present invention, the supporting span of the tube bundle portion with respect to the container can be shortened, and the tube bundle portion can have a natural frequency necessary for earthquake resistance. Therefore, a large heat exchanger can be obtained without increasing the radial dimension and weight.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a helical coil heat exchanger of the present invention.

FIG. 2 is a partial perspective view showing a schematic configuration of a tube bundle unit.

FIG. 3 is a partial perspective view of a shroud.

FIG. 4 is a schematic view of a conventional helical coil heat exchanger.

[Explanation of symbols]

 11 Container 11a Body 16 Shroud 17 Tube Bundle Unit 18 Inner Cylinder 19, 20 Support Beam 21 Heat Transfer Tube Support Member 22 Heat Transfer Tube 23 Perforated Plate 31, 32 Protrusion

Claims (1)

[Scope of utility model registration request] 1. A helical coil type in which a substantially cylindrical shroud is provided in a container into which a heating fluid is introduced, and a tube bundle unit formed by spirally winding a heat transfer tube around an inner cylinder is provided inside the shroud. In the heat exchanger, the heat transfer tube is supported by a heat transfer tube support member suspended from a support beam extending from the inner cylinder, and the outermost end of the heat transfer tube support member and the outer periphery of the shroud correspond to each other. A helical coil heat exchanger characterized in that projections are formed on the inner surface of the shroud and on the inner surface of the container, respectively.