JPH0792355B2 - Multi-tube heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cooler for a nuclear power plant, a chemical device or the like, and more particularly to a multi-tube heat exchanger in which a body fluid faces a tube fluid. .

[Conventional technology]

A conventional heat exchanger, as described in JP-A-59-170697, is a cutout baffle type heat exchanger, in which a ring-shaped baffle plate is provided in the barrel-side inlet nozzle portion,
The flow of the body-side fluid in the body is made uniform. Further, since heat transfer tubes cannot be arranged on the outer peripheral side of the annular baffle, a space is formed between the body and the heat transfer tube group. However, in the case of a notch baffle, the baffle can be enlarged so as to be inscribed in the body, but in a multi-tube heat exchanger in which the body side fluid flows in parallel with the heat transfer tubes, there is a space around the heat transfer tube group. As a result, a fluid that does not come into contact with the heat transfer tube is generated, and the flow velocity on the cylinder side becomes slow, so that the heat exchange performance deteriorates.

[Problems to be solved by the invention]

The above-mentioned conventional techniques reduce the pressure loss of the body-side fluid in the body with respect to the increase in the body-side fluid flow rate, reduce the vibration damage of the heat transfer tube at the body-side fluid inlet, and the body-side fluid flow at the body-side fluid inlet. There was a problem that sufficient consideration was not given to the points such as homogenization of water and reduction of dead water area. In particular, when the body fluid is a liquid such as water, the density is high, and the above-mentioned problem is likely to occur.

An object of the present invention is to provide a shell-and-tube heat exchanger capable of improving the heat exchange performance and reducing the pressure loss of a cooler such as a nuclear power plant, a thermal power plant, and a chemical device with a simple structure. Especially.

[Means for solving problems]

The present invention relates to a plurality of heat transfer tubes arranged in a cylindrical body, a tube plate for fixing both ends of the plurality of heat transfer tubes, and a body diameter of at least one of an inflow part and an outflow part of a body side fluid of the body. In a multi-tube heat exchanger that has a different diameter part that is larger than the diameter of the other part, and the body side fluid and the heat transfer tube fluid exchange heat in a counter flow. It consists of a conical cylinder between the inner circumference of the part and one side of the axial direction away from the tube sheet, and the other side is in close contact with the step part of the different diameter part. The flow dividing member is provided such that the distance from the inner circumference is narrower than the distance from the inner circumference of the different diameter portion on the opposite side in the circumferential direction.

[Action]

If a conical baffle diversion plate is installed between the body-side fluid inlet and the heat transfer tube, the flow passage area between the conical baffles of the body will differ depending on the position, so the fluid will be uniform and the pressure loss on the body side will be reduced. Furthermore, the dead water area of the body side fluid can be reduced.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

Body-side inlet nozzle 4 through which body-side fluid 3 flows into the tubular body 1.
The outlet nozzles 5 on the side of the body which flow out are installed, and the tube sheet 8 is arranged at both ends of the body 1 and both ends of a large number of heat transfer tubes 6 are arranged on both tube sheets 8.
The heat transfer tubes 6 are arranged at a predetermined pitch of the body 1, and are densely arranged so that the gap between the heat transfer tubes 6 and the inner surface of the body 1 is equal to or less than the pitch. On the other hand, the tube-side head 9 provided on the opposite side of the body 2 of both tube plates 8 is provided with the tube-side inlet nozzle 10 through which the tube-side fluid 12 flows in and the tube-side outlet nozzle 11 through which it flows out. The heat transfer tube 6 group is provided with heat transfer tube support members 7 at appropriate intervals, thereby supporting the main body portion.

The cylinder diameter of the body 1 of the portion to which the body side inlet nozzle 4 is attached, that is, the inflow portion 2 of the body side fluid 3 is formed to be larger than that of the other portion of the body 1 or the body portion. The outflow portion 19 of the body-side fluid 3 of the body 1 is also formed to have a large diameter.

Inside the inflow portion 2 of the body 1, a flow dividing member 13 made of a flat baffle plate for distributing the flow direction of the body-side fluid flowing into the body 1 is provided. FIG. 2 is a diagram of FIG.
There is a space 20 between the outermost heat transfer tube 6 and the inflow portion 2 of the body 1, which is a sectional view taken along line II-II. In FIG. 2, the heat transfer tubes 6 are arranged at the intersections in the body 1.

Next, the operation of this embodiment will be described. Pipe side fluid 12
Flows in the tube-side head 9 from the tube-side inlet nozzle 10 and flows in the plurality of heat transfer tubes 6 so that the tube-side outlet nozzle 11 of the tube-side head 9
More out of the system. On the other hand, the body-side fluid 3 enters the body 1 from the body-side inlet nozzle 4 and flows into the large-diameter inflow portion 2 into the flow dividing member 13
Partly flows between the body 1 and the heat transfer tube 6 group, and partly flows in the space 20 at right angles to the heat transfer tube 6 as shown in FIG. 2, and then along the heat transfer tube 6. It flows through the body of the body 1. The inflow part 2 of the body 1 has a larger diameter than the other part of the body 1 in which the heat transfer tubes 6 are densely arranged, and has a space 20
Therefore, the body side fluid 3 has a remarkably smaller flow velocity than the body side inlet nozzle 4, and since the fluid resistance is small, the body side fluid 3 passes through the space 20 and is on the opposite side of the body side inlet nozzle 4 (downward in the drawing).
It becomes easy to flow.

Another embodiment will be described with reference to FIG. The difference from the configuration of FIG. 1 is that a conical baffle plate 14 is provided as the flow dividing member 13. This conical baffle plate 14 is asymmetrical, and the gear gap between the portion close to the tube sheet 8 and the inflow portion 2 of the body 1 is small up to the vicinity of the body-side inlet nozzle 4 and, conversely, the portion farther from the body-side inlet nozzle 4. Larger (lower part of the drawing) is formed.

The body-side fluid 3 flows from the body-side inlet nozzle 4 into the inflow portion 2 of the body 1.
Enter the inside and hit the conical baffle plate 14, part of which is the tube plate 8
And then flows along the heat transfer tube group 6. The remainder is shown in FIG. 4 along the baffle plate 14 due to the effect that the conical baffle plate 14 on the opposite side of the tube plate 8 and the inflow portion 2 go around the side having a large flow passage area. It flows in the circumferential direction, and part of it flows toward the heat transfer tube group 6.

According to the present embodiment, the gear baffle between the conical baffle plate 14 and the inflow portion 2 of the body 1 is different depending on the position in the circumferential direction. The flow velocity of the fluid 3 can be made uniform throughout the body 1 and the entire body. At this time, by properly selecting the distance 1 between the baffle plate 14 and the tube plate 8, the flow side of the shell side fluid 3 entering the heat transfer tube group 6 can be made appropriate.

Since the conical baffle plate 14 is provided up to the vicinity of the tube plate 8, it is difficult to form a dead water region of the body side fluid 3 in the vicinity of the tube plate 8, and heat exchange performance is improved. Moreover, since the flow of the body-side fluid 3 is uniform, the pressure loss in the body 1 is also small.
The same effect can be obtained by making the body side nozzle 5 have a similar structure.

Another embodiment will be described with reference to FIG. The difference from the configuration of FIG. 3 is the inclination of the conical baffle plate 15 provided as the flow dividing member 13. The inclination is opposite to that of the baffle plate 14 shown in FIG. That is, the distance between the baffle plate 15 and the inflow portion 2 of the body 1 is formed so as to be closer to the tube sheet 8. However, the distance is the trunk side inlet nozzle 4
3 is similar to that of FIG. 3 in that it is small at a position close to the point b, and is largest at a position farthest from the body side inlet nozzle 4 (downward in the drawing). An inner cylinder 16 having the same diameter as the body 1 is provided inside the baffle plate 15.

As shown in FIG. 6, the baffle plate 15 causes the body side fluid 3 to flow mainly on the side of the tube plate 8 side where the gear gap between the baffle plate 15 and the inflow portion 2 is large and the flow passage area is large so that the heat transfer tube is uniform. It flows to 6 groups. Further, since the inner cylinder 16 enlarges a portion that flows in parallel with the heat transfer tube 6, the heat exchange performance is improved. With the trunk side outlet nozzle 5 having the same structure,
The same effect can be obtained.

Another embodiment will be described with reference to FIG. Fig. 1 ~
6 shows an example where the heat transfer tube 6 is a straight tube, while FIG. 7 shows an example where the heat transfer tube 6 is U-shaped. The inflow portion 2 of the body 1 is provided with a body side inlet nozzle 4 and the opposite side outflow portion 19 is provided with a body side outlet nozzle 5. In the U-shaped structure of this embodiment, the inflow portion 2 and the outflow portion 19 are integrated in the circumferential direction. The integral inflow part 2 and outflow part 19 are connected to the tube sheet 8 on one side and the U-shaped body of the body 1 on the other side. Heat transfer tube 6 is also U
Both ends of the opening are attached to the tube sheet 8 and are supported by appropriate spacing heat transfer tube support members 7. At the center of the body 1,
A partition plate 18 is provided to form a U-shaped structure. The integral inflow part 2 and outflow part 19 are formed to have a tube diameter larger than that of the body of the body 1, and a conical baffle plate 17 similar to that of the embodiment of FIG. There is. The distance between the baffle plate 17 near the tube plate 8 and the inflow portion 2 of the body 1 is small near the body side inlet nozzle 4,
It is formed large near the partition plate 18. The same applies to the case side outlet nozzle 5 side. On the other hand, the pipe side head 9 is provided with a pipe side inlet nozzle 10 and a pipe side outlet nozzle 11.
21 indicates a partition plate.

Next, the operation will be described. The tube-side fluid 12 flows into the tube-side head 9 from the tube-side inlet nozzle 10, flows through the plurality of heat transfer tubes 6, passes through the U-shaped portion, and exits the system from the tube-side outlet nozzle 11 of the tube-side head 9. Get out.

On the other hand, the body-side fluid 3 flows in from the body-side inlet nozzle 4 from the inflow portion 2 in the body 1, is split by the baffle plate 17, and then flows between the heat transfer tube groups 6. Flow along the heat transfer tube 6,
After changing the flow direction at the U-shaped portion of the heat transfer tube 6 and flowing again through the group of heat transfer tubes 6, it exits the system from the trunk side outlet nozzle 5.

According to the present embodiment, even when the heat transfer tube 6 is U-shaped, the effects described in the case of the straight heat transfer tube described above can be obtained. 8 shows a sectional view taken along the line VIII-VIII in FIG.

〔The invention's effect〕

According to the present invention, by providing a flow dividing member made of a conical baffle between the body side fluid inlet and outlet and the heat transfer tube group,
It is possible to improve the heat exchange performance by reducing the pressure loss on the cylinder side by uniformizing the flow of the fluid and by reducing the dead water area of the cylinder side fluid.

[Brief description of drawings]

FIG. 1 is a sectional view of a shell-and-tube heat exchanger according to an embodiment of the present invention,
2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view of a shell-and-tube heat exchanger of another embodiment, and FIG. 4 is a sectional view taken along the line IV-IV of FIG. FIG. 5 is a cross-sectional view of a shell-and-tube heat exchanger of another embodiment, FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5, and FIG. 7 is a cross-section of a shell-and-tube heat exchanger of another embodiment. Figures and 8 are VIII of Figure 7.
It is a VIII line sectional view. 1 ... Body, 2 ... Inflow part, 3 ... Cylinder side fluid, 4 ... Cylinder side inlet nozzle, 5 ... Cylinder side outlet nozzle, 6 ... Heat transfer tube,
7 ... Heat transfer tube support, 8 ... Tube plate, 9 ... Tube side head,
10 …… Pipe side inlet nozzle, 11 …… Pipe side outlet nozzle, 12 ……
Pipe side fluid, 13 …… Flow dividing member, 14, 15 …… Conical baffle plate, 16 …… Inner cylinder, 18 …… Partition plate, 19 …… Outflow part, 20 ……
space.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shozo Nakamura 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. Inside the Mechanical Research Laboratory (56) References Actually open 56-33481 (JP, U) Actually open 59-13857 (JP, U)

Claims (1)

[Claims] 1. A plurality of heat transfer tubes arranged in a cylindrical body, a tube plate fixing both ends of the plurality of heat transfer tubes, and at least one of an inflow section and an outflow section of a body side fluid of the body. In a multi-tube heat exchanger having a different diameter part in which the diameter of the body is larger than the diameter of the other part, and the body-side fluid and the fluid in the heat transfer tube exchange heat in a counterflow, Between the outer circumference of the group and the inner circumference of the different diameter portion,
It is composed of a conical tube, and one side in the axial direction is separated from the tube sheet and the other side is brought into close contact with the step part of the different diameter part, and the inflow part or the outflow part side in the circumferential direction and the inner circumference of the different diameter part. A multi-tube heat exchanger, characterized in that a flow diverting member is provided with a space between the inner circumference of the different diameter portion on the opposite side in the circumferential direction being narrower.