JP2865922B2 - Multi-tube heat exchanger - Google Patents

Abstract

PURPOSE:To prevent a decrease in heat transfer performance by bypassing body side fluid at a tube group in a multi-tube type heat exchanger having an expansion joint at a body. CONSTITUTION:A multi-tube heat exchanger has an expansion joint provided around a body 2 to absorb the thermal expansion difference of a body side and a tube side, and comprises a porous body side fluid dispersive sleeve 5 disposed inside a tube base of the joint and fixed at its one end to the body 2, and a flexible sealer (deflection plate 7) interposed in a gap between the body 2 for containing the other end of the sleeve 5 and a sealing ring 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multitubular heat exchanger and a reactor capable of improving the heat transfer performance of a tube bank (both are referred to as heat exchangers in this specification).

[0002]

2. Description of the Related Art FIGS. 5 to 8 show a conventional multitubular reactor having a dispersion sleeve, FIG. 5 is a side sectional view thereof, FIG. 6 is a detailed view of an example of a VI section in FIG. Is VII-VI in FIG.
FIG. 8 is a cross-sectional view of another example of the VI section in FIG. 5.

In these figures, a tube group 6 attached to a plurality of tube sheets 2a and arranged in the axial direction of the cylinder 2 is provided in a cylindrical vertical body 2 of a multi-tube heat exchanger. Heat is exchanged between the tube-side fluid flowing inside the tube group 6 and the body-side fluid flowing outside the tube group 6. An expansion joint 3 is provided between the tube sheets 2a, 2a of the body 2 over the entire periphery thereof which is orthogonal to the axial direction of the body 2, and absorbs a difference in thermal expansion between the body side and the tube side. I have. Reference numeral 1 denotes a case in which the body-side fluid 4 flowing into the expansion joint 3 passes through the perforated plate dispersion sleeve 5 and flows outside each tube of the tube group 6, and leaks from the gap at the end of the dispersion sleeve 5. It is a seal ring that suppresses this. The seal ring 1 is attached to the body 2 by welding, and one end (upper end) of the dispersion sleeve 5 is accommodated in a gap formed by the seal ring 1 and the body 2.

The end (lower end) of the dispersion sleeve 5 opposite to the seal ring 1 is attached to the cylinder 2 by welding, and there is no leakage of the cylinder-side fluid at this portion. The end of the dispersion sleeve 5 on the side of the seal ring 1 is not fixed to the body 2 and the seal ring 1 so as not to restrict the movement of the body 2, that is, the expansion and contraction in the axial direction due to the thermal expansion difference between the body side and the tube side. Structure (FIG. 6), or a structure supported by the seal ring 1 with bolts 8 inserted into the elongated holes so as to be slidable in the axial direction of the body 2 (FIG. 8), and formed by the body 2 and the seal ring 1. Is accommodated in the gap. Therefore, in order to minimize the gap from the viewpoint of preventing fluid leakage, a special manufacturing method such as mounting the seal ring 1 in actual condition is adopted.

However, it is unavoidable that a gap is formed between the seal ring 1, the body 2 and the dispersing sleeve 5, and as shown by an arrow in FIG. 6, the body side fluid inside the expansion joint 3 leaks from this gap. I do. The liquid leaked from this gap flows along the circumferential direction to the outlet provided on the opposite side of the expansion joint 3.

Due to this leak, the flow rate of the body side fluid 4 uniformly passing through the tube group 6 from the porous portion of the dispersion sleeve 5 is reduced, and the heat transfer performance of the tube group 6 is reduced.

In FIG. 1, reference numeral 9 denotes an inlet nozzle provided on the telescopic joint 3, reference numeral 10 denotes an outlet nozzle provided on the telescopic joint 3, and the dispersion sleeve 5 is provided inside these nozzles.
Reference numeral denotes a partition plate for preventing a side flow of the fluid 4 disposed in the expansion joint 3.

[0008]

There are the following problems to be solved in the sealing of the sleeve for dispersing the body side fluid of the conventional multi-tube heat exchanger.

That is, as described above, at one end of the dispersion sleeve, it is necessary to prevent the movement of the expansion joint from being restricted, and therefore, as shown in FIG. In this case, there is a problem that it is against the prevention of leakage of the body side fluid. On the other hand, as shown in FIG. 8, when the dispersion sleeve is attached to the seal ring with bolts, the leakage of the body side fluid can be prevented to some extent, but the expansion joint moves within a limited range due to the elongated holes and the bolts. However, there is a problem that the movement of the expansion joint beyond this range is restricted.

[0010] Further, any of the above-mentioned conventional structures is insufficient for the purpose of preventing fluid leakage, and there has been a problem that the leak reduces the flow rate passing through the tube group and causes a decrease in heat transfer performance.

Further, when a certain gap is maintained between the body and the seal ring, there is a problem that uncertain and inefficient actual alignment is required.

An object of the present invention is to provide a multi-tube heat exchanger that can solve the above problems.

[0013]

SUMMARY OF THE INVENTION The present invention comprises an expansion joint provided around a shell for absorbing a difference in thermal expansion between the shell side and the pipe side, and having a nozzle at the inlet and / or outlet for the body side fluid. In the multi-tubular heat exchanger, a porous sleeve for dispersing a body-side fluid which is disposed inside a nozzle of the expansion joint and one end of which is fixed to the body, and a body for housing the other end of the dispersion sleeve And a flexible sealing device interposed in a gap formed by a seal ring provided on the body.

[0014]

When the expansion joint is provided with an inlet nozzle in the present invention, the body-side fluid flowing into the expansion joint through the inlet nozzle serves as the body, the dispersion sleeve and the dispersion sleeve at the other end of the dispersion sleeve. Attempts to leak through the gap between the dispersing sleeve and the seal ring, but the gap is equipped with a flexible sealing device, which prevents the flow of fluid and prevents leaks. Does not flow to the outlet side along the circumferential direction, and the heat transfer performance of the tube group is not reduced. Further, the flexible sealing device can maintain the sealing property in accordance with the change of the gap due to the movement due to the thermal expansion or the like of the expansion joint, and does not restrict the movement of the expansion joint.

On the other hand, in the case where the expansion joint is provided with an outlet nozzle in the present invention, the fluid flowing out of the expansion joint is dispersed by the flexible sealing device at the other end of the dispersion sleeve. Leakage between the sleeve and the dispersion sleeve and the seal ring is prevented, and the body-side fluid flowing inside the body does not flow sideways along the circumferential direction, which may cause a decrease in heat transfer performance due to the tube group. Absent. Further, similarly to the above, the flexible sealing device can maintain the sealing property in accordance with a change in the gap due to thermal expansion or the like of the expansion joint, and can restrain the movement of the expansion joint. Absent.

Further, when both the inlet and outlet nozzles are provided in the expansion joint, the same effect as when the inlet and outlet nozzles are provided is provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1 is a side sectional view of the embodiment, FIG. 2 is a detailed view of a portion II in FIG. 1, and FIG. 3 is a sectional view taken along the line III-III in FIG.

This embodiment is an improvement of the conventional multi-tube heat exchanger shown in FIGS. 5 to 8 as described below.
1 to 3, the same components as those in FIGS. 5 to 8 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, the upper end of the portion between the body 2 and the seal ring 1 of the dispersion sleeve 5 provided in the expansion joint 3 inside the nozzle 9 at the inlet is bent in an omega shape to be flexible. A baffle plate 7 made of a thin plate having a shape is attached by welding or screwing.

The seal ring 1 is attached to the body 2 such that a bent portion of the baffle plate 7 is in close contact with the inside of the body 2 and the seal ring 1.

In this embodiment constructed as described above, as shown by arrows in FIGS. 1 and 2, the body-side fluid 4 entering from the nozzle 9 at the inlet passes through the dispersion sleeve 5. It reaches the outlet nozzle 10 via the tube group 6 and the dispersion sleeve 5 on the outlet side. At this time, the baffle plate 7 prevents the fluid from leaking from the gap between the body 2 and the upper end of the dispersion sleeve 5. Thereby, the flow that flows sideways through the tube group 6 and reaches the dispersion sleeve 5 on the outlet side can be significantly reduced, and the heat transfer performance of the tube group 6 can be improved.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, only one end of the baffle plate 7 'is attached to the upper end of the dispersing sleeve 5, and this is brought into close contact with the inside of the body 2 and the seal ring 1.
The same operation and effect as those of the embodiment can be obtained.

In the above embodiment, the dispersion sleeve 5 is provided inside the nozzle 9 at the entrance of the expansion joint. However, the dispersion sleeve is provided inside the nozzle 10 at the exit of the expansion joint, and is fixed to the body. It is also possible to provide a baffle similar to that described above at its end on the other side. In this case, the body side fluid is prevented from leaking from the gap at the end of the dispersion sleeve at the outlet side, and the body side fluid is largely prevented from flowing sideways through the tube group 6 as described above. The heat transfer performance of the group can be improved.

In the case where the dispersion sleeve is provided inside both the nozzle at the inlet and the nozzle at the outlet of the expansion joint and the baffle plate is provided as described above, leakage of the body-side fluid causes the leakage at the inlet and the outlet. Both sides are prevented, and the heat transfer performance of the tube bank can be further improved.

[0025]

According to the present invention, as described in the appended claims, a flexible sealing device is provided in the gap between the seal ring and the body in which the end of the dispersion sleeve not fixed to the body is housed. Because of the interposition, the movement of the expansion joint is not restricted, and even if the size of the gap changes due to the movement of the expansion joint, the body side fluid can be reliably sealed, and the tube group Can improve the heat transfer performance.

Further, since the flexible sealing device is used, the accuracy of the gap interval due to the actual alignment at the time of mounting the conventional seal ring can be relaxed, so that the efficiency of mounting the seal ring is improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a first embodiment of the present invention.

FIG. 2 is a detailed view of a part II in FIG. 1;

FIG. 3 is a sectional view taken along the line III-III in FIG. 1;

FIG. 4 is a detailed view of a second embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional multi-tube heat exchanger.

FIG. 6 is a detailed view of a VI section in FIG. 5;

7 is a sectional view taken along the line VII-VII in FIG.

FIG. 8 is a cross-sectional view of another example of the section VI in FIG. 5 of the conventional multi-tube heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seal ring 2 Body 3 Expansion joint 5 Dispersion sleeve 6 Tube group 7, 7 'Baffle plate 9 Inlet nozzle 10 Outlet nozzle

Claims (1)

(57) [Claims] 1. A multi-tubular heat exchanger provided with a telescopic joint provided around a trunk to absorb a thermal expansion difference between the trunk side and the tube side and having a nozzle at an inlet and / or an outlet of a trunk side fluid, A porous body-side fluid dispersion sleeve disposed inside the nozzle of the expansion joint and having one end fixed to the body, a body accommodating the other end of the dispersion sleeve, and a seal ring provided on the body And a flexible sealing device interposed in a gap between the heat exchanger and the heat exchanger.