JPS5931671B2 - Shell and tube heat exchanger - Google Patents

Description

[Detailed Description of the Invention] Shell-and-tube heat exchangers that have been widely used in the past can be roughly divided into the cutout plate baffle type shown in Fig. 1 and the donut baffle type shown in Fig. 2. The flow of the fluid in the shell repeats cross flow, oblique flow, and parallel flow as shown by the arrows in the figure, so there is a risk that the heat exchanger tubes will vibrate and be damaged.

As a countermeasure for this, there is a method to avoid resonance by increasing the natural frequency by shortening the interval between baffles a.
When using this method, there is a problem in that the pressure loss of the fluid inside the shell increases.

In Figures 1 and 2, b is the shell, C is the fluid inlet in the shell, d is the fluid outlet in the shell, e is the heat transfer tube, f is the fluid inlet in the tube, g is the fluid outlet in the tube, and h is the tube plate. , i indicates a partition plate.

In order to solve the problems of conventional heat exchangers, the present invention prevents the vibration of the heat exchanger tubes by making the flow of the fluid in the shell parallel to the heat exchanger tubes, and also changes the flow of the fluid in the shell to be parallel to the heat exchanger tubes. To compensate for the decrease in heat transfer, an inner tube is installed inside the shell, thereby increasing the flow velocity of the fluid in the shell, and a support column installed to support this inner tube disturbs the fluid in the shell. It is designed to improve heat transfer.

The present invention will be described below with reference to an embodiment shown in FIGS. 3 to 5.

In the figure, 1 is a shell, 2 is a heat exchanger tube, 3 is a fluid inlet in the shell,
4 is a fluid outlet in the body, 5 is a fluid inlet in the tube, 6 is a fluid outlet in the tube, 7 is a tube plate, and 8 is a partition plate, which are the same as the conventional one.

Reference numeral 9 denotes a hollow inner cylinder extending in the axial direction at the center of the body 1, and a balance hole 10 is appropriately provided therein so as not to be deformed by the pressure of the fluid within the body.

The fluid inside the shell flows into the shell 1 from the fluid inside the shell 3 and flows parallel to the heat exchanger tubes 2, and the support columns 1 arranged perpendicularly to this flow flow into the shell 1.
1, the fluid flows out through the in-body fluid outlet 4 while being disturbed.

This inner cylinder 9 is fixed to a disk 12 by a support column 11, and the disks 12 are kept spaced apart from each other by a support rod 13.

The inner cylinder 9, the support column 11, the disk 12, the support rod 13, and the heat transfer tube 2 are integrated in advance and inserted into the shell 1.

The tube fluid flows in from the tube fluid port 5, passes through the heat transfer tube 2, and exits from the tube fluid outlet 6.

Therefore, in the present invention, since the fluid in the shell flows parallel to the heat exchanger tubes, vibration of the heat exchanger tubes can be prevented.

Since the inner cylinder is installed in the shell, the cross-sectional area of the flow path of the fluid in the shell can be reduced, thereby increasing the flow velocity of the fluid in the shell, and as a result, the heat transfer performance can be improved.

Further, the support pillars that support the inner cylinder serve as a kind of turbulence promoter and can improve heat transfer.

As described above, damage to the heat exchanger tubes due to vibration of the heat exchanger tubes can be prevented without deteriorating heat transfer performance or increasing pressure loss.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams showing a conventional shell-and-tube heat exchanger, FIGS. 3 to 5 show an embodiment of the present invention, FIG. 3 is a sectional view, and FIG. FIG. 3 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a partially enlarged view of FIG. 3. Shell 1, heat transfer tube 2, fluid population in the shell 3, fluid outlet in the shell 4, inner cylinder 9, support column 11°

Claims (1)

[Claims] 1 A large number of heat transfer tubes are housed in the shell in parallel with the heat transfer tubes, and the shell fluid that flows into the shell from the shell fluid inlet provided at one end for the core flows parallel to the heat transfer tubes and To reduce the flow path cross-sectional area of the in-shell fluid that flows through the shell in parallel with the shell in a shell-and-tube heat exchanger in which the in-shell fluid flows out from the in-shell fluid outlet provided at the other end. A shell-and-tube heat exchanger characterized in that an inner cylinder is provided, and the inner cylinder is supported by a number of support pillars that intersect with the flow of fluid inside the cylinder.