JPH0740852Y2 - Plate fin type heat exchanger - Google Patents

Description

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

[Conventional technology]

As shown in FIG. 5, a commonly used plate fin type heat exchanger has spacer bars 2 and 2 at both ends of the space formed between the upper and lower tube plates (plate-shaped partition walls) 1 and 1. The corrugated fins (corrugated partition walls) 3 are arranged between the spacer bars 2 and 2, and the fluid passages are stacked in a plurality of stages and integrally brazed. In the heat exchanger shown in the figure, the fluid passages are assembled so that they are orthogonal to each other, and the high temperature fluid A and the low temperature fluid B are taken into the fluid passages from the adjacent side surfaces 4 and 5, and they are staggered from each other as shown by arrows. Heat is exchanged by flowing in a direction orthogonal to the.

The plate fin type heat exchanger includes, in addition to the above-mentioned cross flow type, a counter flow type as shown in FIG.

[Problems to be Solved by the Invention] However, when the conventional plate fin type heat exchanger shown in FIGS. 5 and 6 is used for heat exchange of high temperature fluid such as high temperature combustion exhaust gas or steam, Tube plate 1 at each stage on one side 4 which is the inlet of high temperature fluid A
There was a problem that the left and right ends (enclosed with circles) of the were deformed or damaged.

This is because, as shown in FIG. 7, when the high temperature fluid A flows, the corrugated fins 3 in contact with the central portion of the tube plate 1 are rapidly heated, while the spacer bars 2 in contact with the left and right ends of the tube plate 1 have a heat capacity. This is because it is hard to be heated so much that an extreme temperature difference occurs between the central portion and the left and right end portions of the tube plate 1 as shown in FIG. 8, and a very large thermal stress is excessively generated at this boundary portion. .

The present invention has been made to solve such a problem, and is a plate that does not deform or break 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, spacer bars 2,2 are arranged at both ends of a space formed between the tube plates 1,1, and corrugated fins 3 are arranged between the spacer bars 2,2. In the plate fin type heat exchanger in which the fluid passages formed by stacking are stacked in a plurality of stages, and the high temperature fluid A and the low temperature fluid B are passed through the respective fluid passages in different stages to perform heat exchange, the high temperature fluid A serves as an inlet. On one side, separated on both sides,
A pair of frame plates 6, 6 was attached to cover only the spacer bars 2, 2 on both sides and the both ends of the fluid passage in the vicinity thereof.

[Action]

According to the above configuration, as shown in FIG.
Is blocked by the pair of frame plates 6 and 6 and flows into only the portion of the fluid passage except both end portions thereof, and does not flow into both end portions thereof. As a result, in the temperature distribution in the width direction of the tube plate 1, as shown in FIG. 3, the temperature difference between the central portion in contact with the corrugated fins 3 and the left and right end portions in contact with the spacer bar 2 is remarkably alleviated. The generation of thermal stress is prevented.

〔Example〕

FIG. 1 is an example of a plate fin type heat exchanger embodying the present invention.

Spacer bars 2 and 2 are arranged at both ends of a space formed between the upper and lower tube plates 1 and 1, and corrugated fins 3 are arranged between the spacer bars 2 and 2 to form a plurality of stages through a fluid passage formed. The plate fin type heat exchanger made of all stainless steel stacked in height is assembled in a so-called cross flow type in which the fluid passages are oriented in the orthogonal direction at each stage, and the high temperature fluid A and the low temperature fluid B are adjacent side surfaces. From 4 and 5, it enters the fluid passage in different steps, flows in the orthogonal direction as shown by the arrow, and heat is exchanged.

Then, a pair of frame plates 6, 6 separately arranged on both sides are attached to one side surface 4 which is an inlet of the high temperature fluid A, and the spacer bars 2, 2 on both sides are attached by the frame plates 6, 6. The high temperature fluid A is prevented from flowing into both ends of the fluid passage in the vicinity.

The frame plates 6 and 6 in the illustrated example are made of a stainless steel plate and are attached to the one side surface 4 by brazing or the like, and have rectangular openings 6a for taking in the high temperature fluid A between the frame plates 6 and 6. To form.

[Effect of device]

As described above, in the plate fin type heat exchanger of the present invention, the frame plate is attached to the inlet of the high temperature fluid so that the high temperature fluid does not flow into both ends of the fluid passage near the spacer bar. The tube plate does not have an extreme temperature difference between the central part and the left and right ends. Therefore, thermal stress does not occur, and it is possible to prevent accidents such as deformation and damage of the tube plate due to thermal stress.

[Brief description of drawings]

FIG. 1 is a perspective view of a plate fin type heat exchanger of the present invention, FIG. 2 is a plan view of essential parts for explaining the flow of high temperature fluid in the plate fin type heat exchanger of the present invention, and FIG. 3 is a plate fin type of the present invention. The graph which shows the width direction temperature distribution of the tube plate in a heat exchanger, FIG. 4 is a front view of a frame plate, FIG. 5 is a perspective view explaining the conventional plate fin type heat exchanger,
FIG. 6 is a perspective view for explaining another conventional plate fin type heat exchanger, FIG. 7 is a plan view for explaining a flow of high temperature fluid in the conventional plate fin type heat exchanger, and FIG. 3 is a graph showing a widthwise temperature distribution of a tube plate in the plate fin type heat exchanger of FIG. 1: Tube plate, 2: Spacer bar, 3: Corrugated fin, 4: One side (high temperature fluid inlet), 6: Frame plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hidemoto Kashima, Inventor, Sumitomo Precision Industries, Ltd., 2-6, Nishi-Nagasu Hondori, Amagasaki City, Hyogo Prefecture (56) References

Claims (1)

[Scope of utility model registration request] 1. Spacer bars (2), (2) at both ends of a space formed between tube plates (1), (1).
And the corrugated fins (3) are arranged between the spacer bars (2) and (2) to form a plurality of stacked fluid passages, and the high temperature fluid A and the low temperature fluid B are arranged in different stages in each fluid passage. In a plate fin type heat exchanger that performs heat exchange by passing the spacer bars (2), (2) on both sides and a fluid passage in the vicinity thereof on one side serving as an inlet of the high temperature fluid A A plate fin type heat exchanger characterized by being fitted with a pair of frame plates (6), (6) covering only both end portions.