JPH05187792A - 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 multi-tube heat exchanger and a reactor (both are referred to as heat exchangers herein) capable of improving the heat transfer performance of a tube bundle.

[0002]

2. Description of the Related Art FIGS. 5 to 8 show a conventional multi-tube reactor having a dispersion sleeve, FIG. 5 is a sectional side view thereof, FIG. 6 is a detailed view of an example of section VI of FIG. Is VII-VI in FIG.
FIG. 8 is a sectional view taken in the direction of the arrow I, and FIG. 8 is a sectional view of another example of the VI portion in FIG.

In these figures, a tube group 6 attached to a plurality of tube plates 2a and arranged in the axial direction of the cylinder 2 is provided in a cylindrical vertical cylinder 2 of a multi-tube heat exchanger. The heat exchange is performed 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 plates 2a, 2a of the case 2 over the entire circumference orthogonal to the axial direction of the case 2 so as to absorb the difference in thermal expansion between the case side and the tube side. There is. No. 1 leaks from the gap at the end of the dispersion sleeve 5 when the body fluid 4 flowing into the expansion joint 3 passes through the dispersion sleeve 5 of the perforated plate and flows outside each tube of the tube group 6. It is a seal ring that prevents that. 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 barrel 2 by welding, and there is no leakage of fluid on the barrel side. The end of the dispersion sleeve 5 on the side of the seal ring 1 is not fixed to the case 2 and the seal ring 1 so as not to restrain the movement of the case 2, that is, the axial expansion and contraction due to the difference in thermal expansion between the case side and the tube side. The structure (FIG. 6), or the structure in which the seal ring 1 is supported by the bolt 8 inserted into the elongated hole so as to be slidable in the axial direction of the body 2 (FIG. 8), and is formed by the body 2 and the seal ring 1. It is housed in the gap. Therefore, in order to prevent the fluid from leaking, a special manufacturing method such as mounting the seal ring 1 in actual condition is adopted to minimize the gap.

However, it is unavoidable that a gap is created between the seal ring 1, the barrel 2 and the dispersion sleeve 5, and as shown by the arrow in FIG. 6, the fluid on the barrel side inside the expansion joint 3 leaks from this gap. To do. The liquid leaking from this gap flows sideways along the circumferential direction to the outlet side provided on the opposite side of the expansion joint 3.

Due to this leak, the flow rate of the body-side fluid 4 that uniformly passes through the tube group 6 from the porous portion of the dispersion sleeve 5 decreases, and the heat transfer performance of the tube group 6 deteriorates.

In the figure, 9 is an inlet nozzle provided on the expansion joint 3, 10 is an outlet nozzle provided on the expansion joint 3, and the dispersion sleeve 5 is provided inside these nozzles.
Is a partition plate for blocking the side flow of the fluid 4 arranged in the expansion joint 3.

[0008]

The sealing of the body-side fluid dispersion sleeve of the conventional multi-tube heat exchanger has the following problems to be solved.

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 restrained. Therefore, as shown in FIG. When keeping the above, there is a problem that it is against the leakage prevention of the fluid on the body side. 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 long holes and the bolts. However, there is a problem in that the movement of the expansion joint exceeding this range is restricted.

Further, any of the conventional structures described above is insufficient for the purpose of preventing fluid leakage, and there is a problem in that the flow rate of the fluid passing through the tube group is reduced due to the leakage and the heat transfer performance is degraded.

Further, in the case where a constant gap is maintained between the cylinder and the seal ring, there is a problem that uncertain and inefficient physical matching is required.

The present invention is intended to provide a multi-tube heat exchanger capable of solving the above problems.

[0013]

SUMMARY OF THE INVENTION The present invention comprises an expansion joint provided around a cylinder for absorbing a difference in thermal expansion between the cylinder side and the tube side and having a nozzle stub for inlet and / or outlet of the cylinder side fluid. In a multitubular heat exchanger, a porous sleeve-side fluid dispersion sleeve disposed inside the nozzle base of the expansion joint and having one end fixed to the cylinder, and a cylinder containing 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]

In the present invention, when the expansion joint is provided with the inlet nozzle, the cylinder-side fluid flowing into the expansion joint through the inlet nozzle is transferred to the cylinder, the dispersion sleeve, and the dispersion sleeve at the other end of the dispersion sleeve. Attempts to leak through the gap between the dispersion sleeve and the seal ring, but the gap is equipped with a flexible sealing device that blocks the flow of fluid and prevents leaks, and the fluid on the barrel side is blocked. Does not laterally flow to the outlet side along the circumferential direction, and the heat transfer performance of the tube group does not deteriorate. Further, the flexible sealing device can maintain the sealing property by adapting to the change in the gap due to the movement of the expansion joint due to thermal expansion or the like, and does not restrain the movement of the expansion joint.

On the other hand, in the present invention, when the expansion joint is provided with the outlet nozzle, the fluid flowing out from the expansion joint is dispersed by the flexible sealing device at the other end of the dispersion sleeve. Leakage is prevented from occurring between the sleeve and the dispersion sleeve and the seal ring, and the body fluid flowing in the body does not laterally flow in the circumferential direction, which may lead to deterioration of heat transfer performance by the tube group. Absent. Further, similarly to the above, the flexible sealing device can maintain the sealing property by adapting to the change of the gap due to thermal expansion of the expansion joint and can restrain the movement of the expansion joint. Absent.

When the expansion joint is provided with both the inlet and outlet nozzles, it has the same effect as when the inlet nozzle and outlet nozzles are 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 same embodiment, FIG. 2 is a detailed view of a II portion of FIG. 1, and FIG. 3 is a sectional view taken along the line III-III of 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 designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the flexibility is obtained by bending the upper end of the portion of the dispersion sleeve 5 provided in the expansion joint 3 between the shell 2 and the seal ring 1 inside the nozzle stub 9 into an omega shape. A baffle plate 7 made of a thin plate having a groove is attached by welding or screwing.

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

In this embodiment having the above-described structure, as shown by the arrow in FIGS. 1 and 2, the body fluid 4 coming from the inlet nozzle 9 passes through the dispersion sleeve 5. It reaches the outlet nozzle 10 through 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. As a result, it is possible to greatly reduce the flow of the tube group 6 to the side of the dispersion sleeve 5 on the outlet side, and it is possible to improve the heat transfer performance of the tube group 6.

The 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 portion of the dispersion sleeve 5 so that it is in close contact with the inside of the body 2 and the seal ring 1.
It is possible to obtain the same operation and effect as those of the embodiment.

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

Further, when the dispersion sleeves are provided inside both the inlet nozzle stub and the outlet nozzle stub of the expansion joint and the baffle plate as described above is provided, the leakage of the fluid on the shell side causes the leakage on the inlet side and the outlet side. This is prevented on both sides, and the heat transfer performance of the tube group can be further improved.

[0025]

According to the present invention, as described in the claims, a flexible sealing device is provided in the gap between the seal ring and the cylinder in which the end of the dispersion sleeve which is not fixed to the cylinder is accommodated. Since it is interposed, the movement of the expansion joint is not restricted, and even if there is a change in the size of the gap due to the movement of the expansion joint, it is possible to reliably seal the fluid on the body side. The heat transfer performance of can be improved.

Further, since the flexible seal device is used, the accuracy of the gap distance due to the actual matching at the time of the conventional seal ring attachment can be relaxed, so that the seal ring attachment efficiency is improved.

[Brief description of drawings]

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

FIG. 2 is a detailed view of a portion II of FIG.

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

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

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

FIG. 6 is a detailed view of a VI portion of FIG.

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

8 is a cross-sectional view of another example of the VI portion of FIG. 5 of the conventional multitubular heat exchanger.

[Explanation of symbols]

 1 Seal ring 2 Body 3 Expansion joint 5 Dispersion sleeve 6 Tube group 7, 7'Baffle plate 9 Entrance nozzle 10 Exit nozzle

Claims (1)

[Claims] 1. A multi-tube heat exchanger provided with a telescopic joint, which is provided around the cylinder and absorbs a difference in thermal expansion between the cylinder side and the tube side, and which has a nozzle for an inlet and / or an outlet of the cylinder side fluid, A porous sleeve-side fluid dispersion sleeve disposed inside the nozzle base of the expansion joint and having one end fixed to the body, and a body containing the other end of the dispersion sleeve and a seal ring provided on the body A multi-tube heat exchanger comprising a flexible sealing device interposed in a gap between and.