Multi-tube heat exchanger

Abstract

The multi-tube heat exchanger includes a bundle of tubes which form fluid passages of first heat exchanging fluid, an outer shell which covers the bundle of tubes and form a fluid passage of second heat exchanging fluid, and a baffle plate which is arranged inside the outer shell in a direction intersecting an axial direction of the bundle of tubes and provided with a plurality of through holes through which respective tubes of the bundle are passed. Each of the through holes has such a shape that a portion of an outer peripheral face of the tube comes into contact with a portion of an inner peripheral face of the through hole, and a gap for passing the second heat exchanging fluid is formed between the other portion of the inner peripheral face and the outer peripheral face of the tube. It is possible to support the tubes with high dimensional accuracy, and to enhance heat exchanging efficiency by decreasing fluid resistance. It is also possible to make pitch of the through holes smaller and to make the heat exchanger compact.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a multi-tube heat exchanger for saving energy in plants of various types, architectures and so on, or for conducting chemical reactions, and more particularly to a structure of a baffle plate which is employed in the multi-tube heat exchanger. [0003] 2. Related Art [0004] As a type of heat exchanger structure, there has been known a multi-tube heat exchanger. This type of heat exchanger includes a number of tubes bundled into a tube bundle which are arranged inside an outer shell, and heat exchanging fluids having respectively different temperatures are supplied into the multi-tubes and inside the outer shell, thereby to conduct heat exchange between the heat exchanging fluids through walls of the multi-tubes. There have been known some types of this heat exchanger in which a baffle plate is provided at the right angle with respect to an axial direction of the tubes for the purpose o...

AI Technical Summary

Benefits of technology

[0009] The invention has been made in view of the above described circumstances as the background, and it is an object of the invention to provide a multi-tube heat exchanger in which tubes can be stably fixed with sufficient stability in strength and dimension, and at the same time, a flow of heat exchanging fluid can be favorably made, whereby fluid resistance can be decreased without lowering heat exchanging efficiency.

Problems solved by technology

However, in the heat exchanger in which the small pass holes are formed in the baffle plate, there has been a problem that the fluid cannot favorably pass through the small pass holes due to their insufficient opening rate, and a request for lowering the fluid resistance cannot be fully satisfied.

Moreover, in the heat exchanger in which the metal plates are assembled like a latticework, although the fluid can relatively favorably flow, supporting strength for the tubes is insufficient, and therefore, it is necessary to employ the metal plates having a larger width (in the axial direction of the tube).

As the results, there has been a problem that a heat transfer area between the heat exchanging fluid and outer walls of the tubes has been decreased.

There has been another problem that because stability in strength and dimension is insufficient, it is difficult to fix positions of the holes, and consequently, arrangement of the tubes is liable to be confused.

Specifically, in the conventional structure, it has been impossible to satisfy all the requirements such as compact arrangement of the tubes, dimensional stability, and the opening rate.

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