JPS62266394A - Longitudinal buffle sealing process for heat exchanger - Google Patents

Abstract

PURPOSE:To improve a performance in operation of a heat exchanger having longitudinal buffles and eliminate a replacement of damaged seal plate at a periodical service by a method wherein a seal plate made of shape memory alloy is applied to close a clearance between the longitudinal buffle of the heat exchanger and a shell. CONSTITUTION:To a longitudinal buffle 2 of a heat exchanger is fixed a seal plate made of shape memory alloy 1 with bolt etc. When a bundle of pipes 4 is to be inserted into a shell 3, either a predeformation or a contact with the shell 3 during the insertion etc. causes a seal plate 1' to be bent. After the bundle of pipes 4 is fixed to the shell 3, it is heated up to such a temperature that permits the memory to be restored with steam or the like, resulting in that the shell plate 1'' is returned to its original shape to abut against the shell 3. With this abutment, the upper and lower portions of the longitudinal buffle 2 are sealed. When the bundle of pipes is to be inserted, even if the seal plate is deformed, it is heated with steam or the like to cause it to be closely contacted with the shell and a superior sealing characteristic is provided. Even in the case of a heat exchanger of a low temperature operation, it is sufficient to heat the pipes before starting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of sealing a longitudinal baffle and a shell of a heat exchanger, and aims to improve the sealing performance of the part where a person works.

[Conventional technology]

Conventionally, stainless steel or the like has been used to seal the gap between the longitudinal baffle and the shell of a heat exchanger, and its spring resilience has been utilized.

[Problem that the invention seeks to solve]

With conventional sealing methods that utilize the spring resilience of stainless steel, etc., when the tube bundle is inserted, it often exceeds the range of elastic deformation, resulting in a bypass on the heat exchanger shell side and poor performance. It was easy.

The present invention aims to eliminate the drawbacks of the conventional sealing methods described above and to provide a sealing method that utilizes heat-restorable gold of a shape memory alloy.

[Means to resolve the problem]

The present invention relates to a longitudinal baffle sealing method for a heat exchanger, which comprises sealing a gap between a longitudinal baffle and a shell of the heat exchanger using a sealing plate made of a shape memory alloy.

[Effect]

As described above, in the present invention, the heating recovery property of the shape memory alloy is utilized to seal the heat exchanger longitudinal baffle and the shell. Its features are (II) Even if the seal plate is deformed when the tube bundle is inserted, it will form a dense layer on the seal by heating with steam or the like, and the sealing performance will be exhibited.

(2) Even if the heat exchanger operates at low temperatures, it is sufficient to heat it before starting operation.

The present invention will be explained below based on the drawings.

FIG. 1 is an overall view of the seal between the heat exchanger longitudinal baffle and the shell. Figures 2 to 4 show the details of part A in Figure 1. Figure 2 shows the tube bundle being produced, Figure 3 shows the tube bundle immediately after it is inserted into the shell, and Figure 4 shows the part after heating. The status is shown respectively.

In the figure, a seal plate 1 made of a shape memory alloy is fixed to a heat exchanger longitudinal baffle 2 with bolts or the like. (Figure 2) 1st
In the figure, when the tube bundle 4 is inserted into the shell 3, the seal plate 1' is bent as shown in FIG. 3 by deforming it in advance or by contacting the shell 3 during insertion. Tube bundle 4
After the seal plate 1' is attached to the shell 3, if it is heated with steam or the like to a temperature higher than that at which the memory is restored, the seal plate 1' tries to restore its original state and hits the shell 3 (FIG. 4). With this care, the top and bottom of the longitudinal baffle 2 are sealed.

〔Effect of the invention〕

By virtue of this invention, we can expect effects such as (I) improved performance of heat exchangers with longitudinal baffles, and (2) no need to replace damaged seal plates during periodic repairs.

[Brief explanation of the drawing]

Figure 1 is an overall view of the sealing part between the heat exchanger longitudinal baffle and the shell, Figures 2 to 4 are detailed views of the entrance in Figure 1, and Figure 2 is the 3 shows the state immediately after the tube bundle is inserted into the shell, and FIG. 4 shows the state after heating. Sub-Agents 1) Meifuku Agent Ryo Hagiwara − Sub-Agent Atsuo Anzai

Claims (1)

[Claims] A method for sealing a longitudinal baffle of a heat exchanger, characterized in that a sealing plate made of a shape memory alloy is used to close a gap between the longitudinal baffle of the heat exchanger and a shell.