JPS58168895A - Heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to heat exchangers and relates to tube support plates that provide lateral support to heat exchanger tubes at 41 - in heat exchangers using multiple tubes. The heated fluid line passes through the central hole of the tube and is cooled by good heat transfer through the tube wall to another fluid flowing through the tube's outer surface (gIF).

This type of heat exchanger operates with a primary loop of heating fluid and a separate secondary loop of another fluid that is heated by the heat transfer described above. The primary loop and the fluid within the primary loop do not contact each other, but are in thermal communication with each other through the walls of the tubes described above. When considerable lengths of tubing are used in the lumber heat exchanger, side supports must be provided to prevent the tubing from loosening or buckling due to thermal stresses.

This lateral support is typically provided by nine tube supports or tube support plates spaced a predetermined distance apart along the length of the tubes within the heat exchanger. These tube supports generally consist of one or more generally flat plates arranged in a plane perpendicular to the tube. Each plate has a plurality of through holes shaped to receive pipes in sliding relationship.

The function of these support plates is to prevent significant lateral movement of the tube while allowing the tube to expand and contract linearly as the tube's a1 degree changes; therefore, the tube is aligned with its respective centerline l.
The tubes pass through these holes in the axial direction K while being prevented from moving laterally parallel to the plane of the support plate.
It is necessary that the tube support plate be configured in such a way that it can be controlled by MI.

In heat exchangers where tube support plates are used, tube damage can occur when relative movement occurs between the tubes and these support plates, or when corrosion causes penetration of the tube walls. When the tube is held in the support plate, the degree of freedom of linear movement is reduced, so the tube receives the buckling load caused by thermal expansion and contraction. ■ When steel pipes can be used,
In order to prevent this, it is recommended that the part of the tube support plate in contact with the steel tube be made of a nickel-based alloy such as Inconelk It. The desired abrasion resistance is provided when lI is excessive. Nickel-based alloys can also be treated with aluminum to further prevent rudder of the tubes within the support plate.

4! In heat exchangers in which the snow support plates are of large dimensions, the cost of using nickel-based alloys for their manufacture is very high.

The main object of the invention is therefore to provide a tube support device for use in heat exchangers, which prevents damage to the tubes while minimizing manufacturing costs. , with Il tubes supported by at least /l tube support plates having m holes, each hole passing through the tube support plate having a predetermined one of the blue numbers of the previous 66 bales.
a plurality of tubular sleeves are each disposed in a predetermined one of the plurality of holes, and each of the plurality of tubular sleeves is rigidly connected to the tube support plate. and a predetermined one of said plurality of tubes with 1vI.
It is characterized by being made in a shape that allows it to be inserted into an RJ connection. ! The length of each of these tubular sleeves is such that it passes completely through the thickness of the tube support plate and may extend beyond the surface of the tube support plate. The tubular sleeve is made from a material with the above-mentioned wear-resistant properties, such as a nickel-based alloy.

The tubular sleeves are diffusion bonded to the tube support plate to provide a rigid connection between each of the tubular sleeves and the tube support plate. After placing the arcuate sleeve into the hole in the tube support plate, the entire assembly is heated to rjjA degrees above toC for a predetermined period of time to cause diffusion bonding. Expansion i! The joining operation is facilitated by an interference fit between the tubular sleeve and the tube support plate and the associated holes in these tubular sleeves.

The relatively high pressure between these components reduces the gA degree and time required to accomplish the puja. This tight fit may be achieved by heat shrinking each of the tubular sleeves into a hole in the tube support plate to which it relates. Each of the tubular sleeves described above is configured to receive one of the heat exchanger tubes in sliding relationship.

The relative diametric dimensions of chain tubular sleeves and their associated heat exchanger tubes are designed to prevent tube movement in the plane of the tube support plate, as well as to prevent tube buckling under thermal loads. It is selected to provide sufficient lateral support to also allow linear sliding to allow axial expansion and contraction of the tube to prevent.

The present invention provides a differentiated tube support system for a heat exchanger that provides both lateral support and axial freedom of movement for the tubes while minimizing manufacturing costs. Additionally, by providing a nickel-based alloy contact surface, the tube support device of the present invention eliminates galling and wear of the tube within the tube support plate without compromising the entire tube support plate being manufactured from this much more expensive material. Minimize.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will become more apparent from the following description of the preferred embodiments, which are illustrated in the accompanying drawings by way of example only.

FIELD OF THE INVENTION The present invention relates generally to heat exchangers using multiple tubes, and to a tube support arrangement that provides If# with lateral support for the tubes, the tubes passing axially through the tube support arrangement. It can slide.

As shown in FIG. 1A and the first BEK, a tube support plate IO of the present invention has a tubular sleeve saw disposed in a hole passing through the plate IO. The cylindrical inner surface of the hole and the cylindrical outer surface 14 of the tubular sleeve saw are -INK diffusion bonded. After assembly of the tubular sleeve/J to the tube support plate 10, a diffusion bonding operation can be performed by heating the assembly to a temperature above detoC. Before the diffusion bonding operation, each tubular sleeve/J assembly in the support plate 10 is provided with a hole on the inner surface/4.
A tight fit is made between 1 and the outside of the tubular sleeve saw @/A. This interference fit provides positive contact between these associated components. This reliable contact facilitates the diffusion bonding process, and the
The position of the tubular sleeve saw within the tube support plate lo is maintained. ? : The pressure between these constituent members is related to the required bonding temperature in an inverse ratio. The relatively high pressure resulting from a strong clamping fit therefore reduces the required joining temperature and the time that this temperature must be maintained. The cylindrical inner surfaces i, t of the tubular sleeve saw are shaped to receive the tubes of the heat exchanger in a sliding relationship - in Figure 1A, the tubular sleeve saw is shown projecting beyond the l plane of the tube support plate IQ. On the other hand, in FIG. 1B, the axial end of the tubular sleeve saw is connected to the tube support plate i.
It is shown to be in the same plane as both planes of o. Both of these modifications, as well as the example with the tubular sleeve saws projecting beyond both planes of the tube support plate io, are within the scope of the invention. These modifications of the preferred embodiment of the invention are due to the design. It merely represents alternative structures, which may vary as a function of performance and manufacturing factors.

FIG. 2 is a more detailed view of the tube support plate io of the invention in which a plurality of tubular sleeve saws are disposed in holes passing through the tube support plate. Also, Figure 2 shows multiple flow holes through which fluid can pass. It is shown. These flow holes are#
i, depending on the specific construction factors of the heat exchanger constituting the invention.

The number, dimension, and position can be changed. These flow holes/
According to J, the fluid passes through the tube support plate /θ, and is divided into multiple parts by the tube support plate 10K of the present invention and flows into various regions of the heat exchanger. are shown, through which heat exchanger tubes 0 pass in a concentric and coaxial relationship. The cylindrical inner surface of each tubular sleeve saw is shaped to receive one of the tubes J0 in sliding relationship. The relationship of the tube O in the tubular sleeve saw is such that it is provided with a pinhole A that allows the tube O to slide within the tubular sleeve J in the axial direction indicated by the arrow. However, the minimum clearance λ must be limited so as not to allow substantial lateral movement in the direction indicated by the arrow.

Each tubular sleeve saw is constructed from a material that minimizes jostling and wear of the connecting round tube J. When the tube O is made of chromium-molybdenum steel, Inconel γ/
A tubular sleeve saw made from a Tsukel-based alloy such as No. 1 satisfies this criterion. Since the tubes 10 are not in direct contact with the tube support plate 10, the tube support plate 10 can be constructed from a much lower cost material, such as chromium-% 17 pudane steel.

Each tubular sleeve saw is diffusion bonded to the tube support plate 10fC1 by heating these components to a temperature exceeding 760C. To facilitate diffusion bonding, the cylindrical outer surface fkJl& of the tubular sleeve saw and the cylindrical inner surface/da of the hole are joined with a tight fit. This interference fit provides a positive contact between these two members and the contact not only aids in the diffusion bonding process, but also retains the tubular sleeve 12 within its associated bore prior to and during the diffusion bonding operation. Assembly of the tubular sleeve 12 into its associated hole can then be carried out by increasing the temperature of the tube support plate 10 or decreasing the temperature of the tubular sleeve/J. This temporary temperature difference eliminates diametrical interference during assembly until the temperatures WL of the tubular sleeve saw and the tube support plate 10 are equal. It is clear that the present invention provides a tube support device for use in a heat exchanger that provides lateral support for the tube support device and the heat exchanger tubes. It is also clear that it allows the use of relatively less expensive materials for the construction of the tube support plate while using better wear-resistant materials in the construction of the tube support plate.

Although the invention has thus been described in detail, it is not limited thereto, and in particular, the selection of materials mentioned above will be a function of the particular application of the tube support device and the material from which the heat exchanger tubes are made. In other applications where the heat exchanger tubes are made from alternative materials, the tube support device of the invention may also be made from alternative materials.The invention uses chromium-molybdenum steel for the support plate and for the tubular sleeve Although described using a nickel-based alloy in , other suitable material selections may be made within the scope of the present invention.

[Brief explanation of the drawing]

Figures 1A and 1B are explanatory cross-sectional views of nine people penetrating the tube support plate of the present invention in which tubular sleeves are disposed, and Figure 1 is an explanatory cross-sectional view of nine people passing through the tube support plate of the present invention, in which a KI [number of heat exchanger tubes are disposed]. 1 is a diagram illustrating a round tube support device constructed in accordance with the present invention; FIG. 10...Tube support plate, l...Tubular sleeve. is・Working hole, /da, /I・・Cylindrical inner surface. 14φ・Cylindrical outer surface, JO・・Heat exchanger tube, core a・
·gap. Patent Applicant: Westinghouse Electric Corporation

Claims (1)

[Claims] By at least one tube support plate with multiple holes! In a heat exchanger IN comprising a plurality of supported tubes, each hole passing through the tube support plate receiving a predetermined one of the plurality of tubes, a predetermined number of the plurality of tubes of the plurality of holes is provided. Each of the plurality of tubular sleeves is provided, and each of the plurality of tubular sleeves is rigidly connected to the tube support plate, and is shaped to receive a predetermined one of the plurality of tubes in a sliding relationship. A heat exchanger characterized by: