JP2003021487A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the occurrence of strains in a partition plate 6 even when clogging temporarily occurs in a heat transfer tube 2. SOLUTION: When a marine organism temporarily adheres to the inside of the heat transfer tube 2 and the tube 2 is clogged, the seawater supplied to one water chamber 5a of a heat exchanger is not sent to the tube 2 and the pressure of the seawater rises in excess of a prescribed value. A valve disc moves downward against the urging force of a coil spring, and a communicating hole 13 is opened. Consequently, the seawater is sent to the other water chamber 5b of the heat exchanger through the hole 13. Therefore, even when clogging occurs in the heat transfer tube 2, the seawater is sent to the water chamber 5b through the communicating hole 13 and no strain occurs in the partition plate 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger such as a shell-and-tube type heat exchanger for exchanging heat between fluid inside and outside a heat transfer tube.

[0002]

2. Description of the Related Art As a heat exchanger having a heat transfer tube, there is a shell-and-tube type heat exchanger. In this heat exchanger, a fluid (medium) flowing inside the heat transfer tube and a fluid flowing outside the heat transfer tube are used. Heat exchange takes place between them. That is, in a shell-and-tube heat exchanger, a tube plate provided with a large number of U-shaped heat transfer tubes is mounted in a tubular main body, and water in the main body on the side where the heat transfer tubes are opened with the tube plate sandwiched therebetween. The chamber is partitioned by a partition plate, the cooling medium (for example, seawater) is supplied from one water chamber, and the seawater flowing through the heat transfer tube is discharged from the other water chamber, while the water in which the heat transfer tube is arranged. A fluid inlet and a fluid outlet are provided in the chamber, and heat exchange is performed between the seawater flowing inside the heat transfer tube and the fluid flowing outside the heat transfer tube, that is, the fluid flowing outside the heat transfer tube is cooled.

[0003]

The conventional shell-and-tube type heat exchanger is designed to circulate seawater in the heat transfer tube to cool the fluid outside the heat transfer tube. There was a possibility that marine organisms could temporarily attach and the heat transfer tubes could be clogged. When the heat transfer tube is clogged, the pressure inside the water chamber on the side where seawater is supplied across the partition plate becomes higher than the pressure inside the water chamber where seawater is discharged,
A pressure difference will occur. If there is a pressure difference between the one water chamber and the other water chamber, the partition plate may be distorted and damaged.Therefore, a gap is created between the partition plate and the tube plate, and seawater flows through the heat transfer tubes. There was a risk of short circuit.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat exchanger in which the partition plate is not distorted even if the heat transfer tube is clogged.

[0005]

In order to achieve the above object, the structure of the present invention is such that a tube plate having a heat transfer tube is mounted in the main body, and the heat transfer tube is opened on the side where the heat transfer tube is opened with the tube plate interposed therebetween. Partition the water chamber with a partition plate, while supplying the medium from one water chamber and discharging the medium flowing through the heat transfer tube from the other water chamber,
In a heat exchanger in which a fluid inlet and a fluid outlet are provided in the heat transfer tube side water chamber and heat is exchanged between a medium flowing inside the heat transfer tube and a fluid flowing outside the heat transfer tube, the partition plate from one water chamber side to the other The non-return circulation means for permitting the circulation of the medium is provided only on the side of the water chamber.

The check circulation means allows the medium to flow only when the pressure in one water chamber becomes higher than the pressure in the other water chamber. Further, in the non-return circulation means, the partition plate is provided with a circulation hole, and the circulation hole is supported by the valve body from the other water chamber side so as to be openable and closable, and the valve body is biased by the spring from the other water chamber side. When the flow hole is closed and the pressure in one water chamber becomes higher than the pressure in the other water chamber by more than a predetermined pressure, the valve element operates to open the flow hole against the biasing force of the spring. It is characterized by being done.

[0007]

1 shows a schematic cross section of a heat exchanger according to an embodiment of the present invention, and FIG. 2 shows a detailed situation of an arrow I portion in FIG.

As shown in FIG. 1, the heat exchanger 1 of the present embodiment is a shell-and-tube type heat exchanger, and U
A tube plate 3 having a large number of V-shaped heat transfer tubes 2 is mounted in a tubular body 4. A water chamber 5 is formed inside the main body 4 on the side where the heat transfer pipe 2 is opened with the tube plate 3 interposed therebetween, that is, on the side where the U-shaped heat transfer pipe 2 does not exist. It is divided into The partition plate 6 is fixed to the tube plate 3 via a gasket (not shown) and is fixed to the inner wall of the main body 4.

One water chamber 5a (upper side in the figure) partitioned by the partition plate 6 is provided with a seawater inlet 7 to which seawater for cooling as a medium is supplied, and the other water chamber 5b (lower side in the figure). Is provided with a seawater outlet 8 through which seawater is discharged. The seawater supplied from the seawater inlet 7 to the one water chamber 5a is sent to the other water chamber 5b through the heat transfer tube 2 and discharged from the seawater outlet 8. Further, the water chamber 4a in the main body 4 on the side where the U-shaped heat transfer tube 2 exists
Is provided with a fluid inlet 9 to which the fluid to be cooled is supplied, and a fluid outlet 10 from which the fluid to be cooled is discharged.

The seawater is supplied from the seawater inlet 7 and the fluid to be cooled is supplied from the fluid inlet 9 to the water chamber 4a, and the seawater passes from the one water chamber 5a to the inside of the heat transfer tube 2 to the other water chamber 5b. The fluid sent and discharged from the seawater outlet 8 and supplied from the fluid inlet 9 to the water chamber 4a is cooled outside the heat transfer tube 2 and discharged from the fluid outlet 10. Thereby, the seawater flowing inside the heat transfer tube 2 and the fluid flowing outside the heat transfer tube 2 are heat-exchanged, that is, the fluid flowing outside the heat transfer tube 2 in the water chamber 4a is cooled.

The partition plate 6 is provided with a non-return flow means 11 for allowing the flow of seawater only from one water chamber 5a side to the other water chamber 5b side. The non-return circulation means 11 allows circulation of seawater when the pressure in one water chamber 5a becomes higher than the pressure in the other water chamber 5b by more than a predetermined pressure.

That is, as shown in FIG. 2, the valve box 12 is fixed to the partition plate 6, and the valve box 12 is arranged on the side of one of the water chambers 5a.
A through hole 13 is provided in the upper part of the. A valve body 14 is movably provided in the valve box 12 in the vertical direction.
The flow hole 13 is closed when the is moved upward. A coil spring 15 for urging the valve body 14 upward and holding the circulation hole 13 on the closed side is provided in the valve box 12, and the valve body 14 is circulated in close contact with the gasket 16 by the urging force of the coil spring 15. The hole 13 is kept closed. When the pressure in one water chamber 5a becomes higher than the pressure in the other water chamber 5b by more than a predetermined pressure, the valve element 14 is operated downward against the urging force of the coil spring 15 and flows. Hole 13
Is opened.

In the heat exchanger 1 having the above-mentioned structure, if seawater is temporarily attached to the heat transfer tube 2 and the heat transfer tube 2 is clogged, the seawater supplied to the one water chamber 5a is The pressure is increased without being sent to the heat transfer tube 2. When the pressure in one water chamber 5a becomes higher than the pressure in the other water chamber 5b by more than a predetermined pressure,
That is, when an excessive pressure exceeding the differential pressure design condition is likely to be applied to the partition plate 6, the valve body 14 causes the coil spring 15 to move.
It is operated downwards against the urging force of, and the circulation hole 13 is opened, and seawater is sent to the water chamber 5b through the circulation hole 13. Therefore, even if the heat transfer tube 2 is temporarily clogged, the flow hole 13
The seawater is sent from the water to the water chamber 5b, the partition plate 6 is not distorted, and the partition plate 6 is not damaged.

Another embodiment of the check valve mechanism is shown in FIGS. 3 and 4.
It will be described based on. FIG. 3 shows a plane (a plane parallel to the partition plate 6) of the non-return circulation means according to another embodiment, and FIG. 4 shows a view taken along the line IV-IV in FIG.

As shown in the figure, the partition plate 6 is provided with a circular flow hole 21, and the flow hole 21 is provided with a check member 22. In the check member 22, a disk-shaped elastic body is divided into a plurality of fan members 22a to form one disk-shaped check member 22. When the pressure difference between the one water chamber 5a and the other water chamber 5b does not exceed the predetermined pressure, the non-return member 22 maintains a disk shape by the elastic force to prevent the seawater from flowing, and the one water chamber When the pressure difference between the water chamber 5a and the other water chamber 5b exceeds a predetermined pressure, the fan members 22a are respectively deformed downward (on the other water chamber 5b side) to form the flow holes 21 (shown by dotted lines in FIG. 4). Distribution of seawater is allowed.

Therefore, even if the heat transfer tube 2 is temporarily clogged, the fan members 22a are respectively deformed downward and the flow holes 2 are formed.
1 is allowed to flow, and the seawater flows from the circulation hole 21 into the water chamber.
5b, the partition plate 6 is not distorted, and the partition plate 6 is not damaged.

As long as the structure of the non-return circulation means 11 is such that the circulation of seawater is allowed only when the pressure of the one water chamber 5a becomes higher than the pressure of the other water chamber 5b, it has been described above. It is not limited to the configuration.

[0018]

According to the heat exchanger of the present invention, a tube plate provided with a heat transfer tube is mounted in the main body, and the water chamber in the main body on the side where the heat transfer tube opens with the tube plate interposed therebetween is partitioned by a partition plate. While supplying the medium from the water chamber and discharging the medium flowing through the heat transfer tube from the other water chamber, a fluid inlet and a fluid outlet are provided in the heat transfer tube side water chamber so that the medium flowing inside the heat transfer tube and the heat transfer tube outside In the heat exchanger that exchanges heat with the flowing fluid, the partition plate is provided with the non-return circulation means that allows the medium to flow only from the one water chamber side to the other water chamber side. The circulation of the medium is allowed when the pressure of the above becomes higher than the pressure of the other water chamber. As a result, even if the heat transfer tube is temporarily clogged,
The partition plate is not distorted, and the partition plate is not damaged.

The non-return circulation means allows the medium to flow only when the pressure in one water chamber becomes higher than the pressure in the other water chamber. The plate is provided with a flow hole, and the flow hole is supported by the valve body from the other water chamber side so as to be openable and closable, and the valve body is biased by the spring from the other water chamber side to close the flow hole. When the pressure in the chamber becomes higher than the pressure in the other water chamber by more than the predetermined pressure, the valve element is operated to open the flow hole against the biasing force of the spring. When the pressure in one water chamber becomes higher than the pressure in the other water chamber by more than a predetermined pressure, the circulation of the medium is allowed. As a result, even if the heat transfer tube is temporarily clogged, the partition plate will not be distorted and the partition plate will not be damaged.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a detailed view of an arrow I portion in FIG.

FIG. 3 is a plan view of a non-return circulation means according to another embodiment,

FIG. 4 is a view taken along the line IV-IV in FIG.

[Explanation of symbols]

1 heat exchanger 2 heat transfer tubes 3 tube sheet 4 body 4a Heat transfer tube side water chamber 5 water chamber 5a One water chamber 5b The other water chamber 6 partition boards 7 Seawater entrance 8 seawater outlet 9 fluid inlet 10 Fluid outlet 11 Non-return distribution means 12 valve box 13 Distribution holes 14 valve body 15 coil spring 21 circulation holes 22 Non-return member 22a fan member

Claims (3)

[Claims] 1. A tube sheet provided with a heat transfer tube is mounted in a main body,
The water chamber in the main body on the side where the heat transfer tubes are opened across the tube plate is partitioned by a partition plate, and the medium is supplied from one water chamber and the medium flowing through the heat transfer tubes is discharged from the other water chamber, while In a heat exchanger in which a fluid inlet and a fluid outlet are provided in the heat pipe side water chamber and heat is exchanged between a medium flowing inside the heat transfer pipe and a fluid flowing outside the heat transfer pipe, the partition plate from one water chamber side to the other A heat exchanger characterized in that a non-return circulation means for permitting circulation of a medium is provided only on the water chamber side. 2. The heat exchange according to claim 1, wherein the check flow means allows the medium to flow only when the pressure in one water chamber becomes higher than the pressure in the other water chamber. vessel. 3. The check flow means according to claim 2, wherein the partition plate is provided with a flow hole, and the flow hole is openably and closably supported by the valve body from the other water chamber side and the valve from the other water chamber side. The body is biased by the spring to close the flow hole, and when the pressure in one water chamber becomes higher than the pressure in the other water chamber by more than a predetermined pressure, the flow hole resists the biasing force of the spring. A heat exchanger characterized in that a valve element is operated in an open state.