JPH0624689Y2 - Plate fin type heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a plate fin type heat exchanger used for heat exchange of high temperature fluid such as high temperature combustion exhaust gas and steam.

[Prior Art] As shown in FIG. 3, a plate fin type heat exchanger generally used has a tube having a fluid passage formed by closing both sides with spacer bars 2 and inserting heat transfer fins 3 therein. The plate 1 is laminated to have a required number of heights and brazed integrally. In the heat exchanger shown in the figure, the fluid passages are assembled alternately so that the high temperature fluid A and the low temperature fluid B are supplied into the fluid passages from the adjacent side surfaces 5 and 6, and are orthogonal to each other as indicated by arrows. To flow and heat is exchanged.

In addition to the above-mentioned cross-flow type, the plate fin type heat exchanger includes a counter-flow type in which a high temperature fluid and a low temperature fluid flow in the same direction.

[Problems to be solved by the device]

However, when the conventional plate fin type heat exchanger shown in FIG. 3 is used for heat exchange of a high temperature fluid such as high temperature combustion exhaust gas or steam, for example, the four corners of one side surface 5 which are the inlets of the high temperature fluid A are used. That is, there was a problem that the left and right ends (enclosed by circles) of the tube plate 1 forming the upper surface and the lower surface of the heat exchanger were deformed or damaged.

This is because the heat transfer fins 3 inserted into the central portion of the tube plate 1 are rapidly heated when the high temperature fluid A flows, whereas the spacer bars 2 contacting the left and right ends of the tube plate 1 have a large heat capacity and are difficult to be heated. This is because an extreme temperature difference occurs between the central portion and the left and right end portions of the tube plate 1, and a very large thermal stress is excessively generated at this boundary portion.

The present invention has been made in order to solve such a problem, and is a plate that is not deformed or damaged due to thermal stress even when used for heat exchange of high temperature fluid such as high temperature combustion exhaust gas and steam. It is intended to provide a fin type heat exchanger.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, the heat transfer fins 3 are inserted between the upper and lower tube plates 1 and 1, and the fluid passages formed by closing both end surfaces with the spacer bars 2 are laminated in a plurality of stages. In the plate fin type heat exchanger configured as above, the spacer bar 2 is formed as a laminated body of the plates 4, and the plate widths of the upper and lower layers thereof are made larger than the plate width of the intermediate layer so as to project toward the fluid passage side. .

[Action]

According to the above configuration, the heat capacity of the upper layer and lower layer portions 4'of the spacer bar 2 protruding toward the fluid passage side is smaller than that of the other portions, so that they are easily heated.

Therefore, the temperature distribution in the width direction of the tube plate 1 is
The spacer bar 2 from the central portion in contact with the heat transfer fins 3
The temperature gradually decreases to the left and right ends that come into contact with, and the sudden temperature difference is alleviated, so that the generation of thermal stress is eliminated. In addition, since the spacer bar 2 has a laminated structure of plates,
The rigidity of the entire heat exchanger is also increased. Therefore, it is possible to prevent the tube plate from being deformed or damaged due to thermal stress.

〔Example〕

FIG. 1 is an example of a plate fin type heat exchanger embodying the present invention, and FIG. 2 is a partial enlargement thereof.

A plate fin type heat exchanger made of all stainless steel in which fluid passages formed by inserting corrugated heat transfer fins 3 inside with both sides closed by spacer bars 2 are stacked through the tube plate 1 in the required number of steps. The heat transfer fins 3 forming the fluid passages are assembled in a so-called cross flow type in which the heat transfer fins 3 are oriented in the orthogonal direction in each stage. The heat transfer fins 3 enter into the heat transfer fins 3 and flow in an orthogonal direction as indicated by an arrow for heat exchange.

The space server 2 is formed by laminating a plurality of plates 4 as shown in FIG. Spacer bar 2 of the illustrated example, a three plates 4 _1, 4 _2, 4 ₃ example formed by laminating, on the upper and lower plates 4 _1, 4 _3, the intermediate layer plate 4 ₂ By using an approximately double width (W) and aligning the outer end faces of the plates 4 ₁ , 4 ₂ and 4 ₃ with each other and brazing them, the upper and lower plates 4 ₁ and 4 ₃ are connected to the fluid passage side. It is formed on a 4'-shaped spacer bar 2 projecting inward.

Note that the illustrated example is an example in which the spacer bar 2 having the above-described laminated structure is provided only in the fluid passage for the high temperature fluid A, but the present invention is not limited to this, and may be provided in the fluid passage for the low temperature fluid B. .

[Effect of device]

As described above, in the plate fin type heat exchanger of the present invention, the spacer bar 2 constituting the fluid passage has a laminated structure of plates, and the upper and lower plates thereof are configured to project toward the fluid passage side. Therefore, the tube plate does not cause an extreme temperature difference between the central portion and the left and right end portions. Further, since the spacer bar has a laminated structure of plates, the rigidity of the entire heat exchanger is increased. Therefore, an accident such as deformation or breakage of the tube plate due to thermal stress does not occur.

[Brief description of drawings]

1 is a perspective view of the plate fin type heat exchanger of the present invention, FIG. 2 is a partially enlarged view of the plate fin type heat exchanger of the present invention,
FIG. 3 is a perspective view illustrating a conventional plate fin type heat exchanger. 1: Tube plate, 2: Spacer bar, 3: Heat transfer fin, 4: Plate, 4 ': Projection part, 5: One side (high temperature fluid inlet), 6: One side (low temperature fluid inlet).

Claims (1)

[Scope of utility model registration request] 1. A tube plate (1) (1) having two upper and lower tubes.
In a plate fin type heat exchanger configured by stacking a plurality of fluid passages formed by inserting heat transfer fins (3) between them and closing both end surfaces thereof with spacer bars (2), the spacer bars (2) Is a laminated body of plates (4), and the plate width of the upper and lower layers thereof is made larger than the plate width of the intermediate layer to project toward the fluid passage side.