JPS5937597Y2 - Shell-and-tube heat exchanger - Google Patents

Description

[Detailed description of the invention] In a conventional multi-tubular heat exchanger with a notched baffle plate, as shown in FIG. It flows in a zigzag manner in the direction of an arrow through a flow path consisting of similar fluids, and during that time it reaches the outlet nozzle 5 while exchanging heat with the fluid inside the tube 4.
It flows out from here.

In such a multi-tubular heat exchanger, the flow velocity distribution of the shell-side fluid in the flow path (hereinafter referred to as the cross-flow part) constructed between the tube plate 2 and the baffle plate 3 or between the two baffle plates 30 has a large effect on performance. Affect.

Since all the baffle plates 3 are installed parallel to the tube plate 2, as shown in FIG. do.

Then, the flow that has entered a part of the cross flow collides with the outlet side buckle plate 3b, changes the direction of the flow, and flows out along this direction, so that a large stagnation area 7 is generated on the downstream side of the inlet side baffle plate 3a.

For this reason, the pressure loss of the shell-side fluid increases due to contracted flow and rapid direction changes, and the heat transfer coefficient has the disadvantage of being extremely lower than the theoretical value.

This invention was devised to eliminate the above drawbacks.
One embodiment shown in FIGS. 3 and 4 will be described below.

In Figures 3 and 4, 10 is 1iik11
12 is a tube, 12 is a notched baffle plate, and 13 is a tube hole provided in the baffle plate 12, through which the tube 11 extends.

18 is a tie rod, and 19 is a hole for a tie rod installed in the baffle plate 12, through which the tie rod 18 extends.

Each baffle plate 12 is provided with a plurality of through holes 14 near its notch side.

Therefore, as shown in FIG. 5, the entrance side baffle plate 12a
The flow of Shell Sen 1 fluid flowing into the cross flow part from the notch 15 collides with the outlet side baffle plate 12b, changes direction, and flows out from the notch 16, but the inlet side baffle plate 12
Since a plurality of through holes 14 are provided near the notch side of a,
A portion of the shell side fluid passes through the through hole 1 without passing through the notch 15.
4 and flows into a portion of the cross flow, the proportion of the stagnation area 17 that occurs downstream of the inlet baffle plate 12a in the cross flow becomes small.

The flow rate flowing through the notch 15 also decreases.

As a result of the above, the effective heat transfer area can be increased and the pressure loss at the notch 15 can also be reduced, so it is possible to expect the same amount of heat exchange as the conventional one with a smaller heat transfer area than the conventional one, and the shell side Pump power for fluid transfer can also be saved.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of a conventional multi-tubular heat exchanger; Fig. 2 is a diagram showing a part of the flow of the cross flow in the above-mentioned conventional heat exchanger; Fig. 3 is a schematic diagram showing an embodiment of the present invention. 4 is a cross-sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a diagram showing the flow of a part of the cross flow in one embodiment of the present invention. 11...Tube, 12...Curved baffle plate,
1o... Can body, 15, 16... Notch,
18...Tie rod, 14...Through hole.

Claims (1)

[Scope of utility model registration request] A plurality of baffle plates each having a notch on one side are arranged in a can body in which a large number of tubes are housed, with a gap between them so that the notches are alternately located at opposite positions, and the shell-side fluid is In a multi-tubular heat exchanger in which the flow passes through a notch in a zigzag manner within the can body, a plurality of through holes other than the holes through which the tubes or tie rods pass are provided near the notch side of the baffle plate. A multi-tube heat exchanger characterized by: