JP2522856Y2 - Heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for recovering heat generated by a chemical reaction in the fields of petroleum, chemistry and energy.

[0002]

2. Description of the Related Art As shown in FIG. 2, in this type of heat exchanger, high-temperature side and low-temperature side tube sheets 2 and 3 are opposed to both longitudinal ends of a main body 1 formed in a hollow cylindrical shape. And a large number of heat transfer tubes 4 are supported between the tube sheets 2 and 3,
The high-temperature fluid 9 introduced from the high-temperature fluid inlet 7 of the high-temperature side cover plate portion 5 serving as a channel portion is discharged from the high-temperature fluid outlet 8 of the low-temperature side cover plate portion 6 through the heat transfer tube 4.
Further, a low-temperature fluid inlet 10 is provided on a side wall portion of the main body 1 near the low-temperature side tube sheet 3, and a high-temperature side tube sheet 2 of the main body 1 is provided.
A low-temperature fluid outlet 11 is provided on a side wall portion near the low-temperature fluid 1, and the low-temperature fluid 1
2 is discharged from the low-temperature fluid outlet 11 through a low-temperature fluid flow path 14 formed by a baffle 13 in the main body 1, and the high-temperature fluid 9 flowing through the heat transfer tube 4 and the low-temperature fluid flow path in the main body 1 Heat is indirectly exchanged with the low temperature fluid 12 flowing through the heat transfer tube 4.

[0003]

However, in the case of a heat exchanger of the above-mentioned type, the thickness of the tube sheets 2 and 3 is the largest for mounting the heat transfer tube 4, and therefore, particularly, the temperature of the heat exchanger 9 in contact with the high-temperature fluid 9 is high. There is a problem that a high thermal stress is generated in a portion of the side tube sheet 2 adjacent to the tube group and a portion attached to the main body 1. That is,
The tube sheet 2 forms a boundary between the heat transfer tube 4 and the main body 1, and the fin effect of the heat transfer tube 4 causes the tube group of the tube sheet 2 to have a relatively low temperature, but the outer peripheral portion thereof has a high temperature and the temperature difference is high. Therefore, high thermal stress due to the temperature difference is generated at the boundary.

Accordingly, the present invention is to reduce the temperature difference between the tube sheets to reduce the thermal stress.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to provide a structure in which a high-temperature side tube sheet and a low-temperature side tube sheet provided at each end of a high temperature fluid inlet side and a high temperature fluid outlet side in a main body are provided. A heat transfer tube is supported, and heat exchange is performed between the low-temperature fluid flowing through the low-temperature fluid passage formed at the position between the two tube plates and the high-temperature fluid flowing through the heat transfer tube through the heat transfer tube. In the heat exchanger, an annular chamber having an outlet opening to the outside of the main body shell is formed on an outer peripheral portion facing the high temperature fluid inlet side of the high temperature side tube sheet forming a corner between the high temperature side tube sheet and the main body body. In addition, a through hole for communicating the chamber and the low-temperature fluid flow path is formed only in the outer peripheral portion of the high-temperature side tube sheet.

[0006]

When the high-temperature fluid and the low-temperature fluid undergo heat exchange, a part of the low-temperature fluid flowing through the low-temperature fluid flow path flows into the chamber through the through hole of the high-temperature side tube sheet, and is discharged from the discharge port. . Therefore, the flow of the low-temperature fluid in the chamber promotes heat transfer in the outer peripheral portion of the tube group of the high-temperature side tube sheet, and reduces thermal stress.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the configuration similar to that of the heat exchanger shown in FIG.
Only through-holes 15 penetrating the tube sheet 2 in the thickness direction are formed at appropriate intervals in the circumferential direction only at the outer peripheral portion of the tube group portion, and a part of the low-temperature fluid 12 flowing through the low-temperature fluid flow path 14 is formed. Through the through hole 15, it is allowed to flow into the high temperature side cover plate portion 5 side, and at the outer peripheral portion facing the high temperature side cover plate portion 5 side of the tube sheet 2 forming a corner between the tube sheet 2 and the main body 1, A chamber 16 for flowing the low-temperature fluid 12 flowing through the through-hole 15 is formed in an annular shape, and an outlet for discharging the low-temperature fluid 12 flowing in the chamber 16 to the outside of the main body 1. 17 is opened at a position corresponding to the chamber 16 of the main body 1.

The heat exchange between the high temperature fluid 9 and the low temperature fluid 12 is shown in FIG.
In the present invention, an annular chamber 16 is formed on the outer peripheral surface of the high-temperature side tube sheet 2 on the high-temperature side lid plate portion 5 side, and the chamber 16 is connected to the low-temperature fluid. The through holes 15 are formed in the tube sheet 2 so that the flow paths 14 communicate with each other.
Is provided, a part of the low-temperature fluid 12 to be discharged from the low-temperature fluid outlet 11 flows into the chamber 16 through the through-hole 15 and is discharged from the discharge port 17 of the chamber 16 to the outside of the main body 1. You. Therefore, since the outer peripheral portion of the tube sheet 2 is cooled by flowing the low-temperature fluid 12 through the chamber 16 and heat transfer is promoted, the pipe group of the tube sheet 2 and the outer peripheral portion thereof are connected. The temperature difference is reduced, and the thermal stress can be reduced.

[0010] The present invention is not limited to the above-described embodiment, and it is a matter of course that various changes can be made without departing from the scope of the present invention.

[0011]

As described above, according to the heat exchanger of the present invention, the main body shell is formed on the outer peripheral portion of the high temperature fluid inlet side surface of the high temperature side tube sheet which forms a corner between the high temperature side tube sheet and the main body body. An annular chamber having an outlet opening to the outside was formed, and a through-hole for communicating the chamber with the low-temperature fluid flow path was formed only in the outer peripheral portion of the high-temperature side tube sheet. A part of the low-temperature fluid can flow into the chamber and be circulated, thereby improving the heat transfer at the outer peripheral portion of the tube group of the high-temperature side tube sheet, and improving the heat transfer of the tube group of the high-temperature side tube sheet and its An excellent effect that the temperature difference in the outer peripheral portion can be reduced, the thermal stress can be reduced, and the reliability can be improved.

[Brief description of the drawings]

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

FIG. 2 is a schematic sectional view showing an example of a conventional heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 High temperature side tube sheet 3 Low temperature side sheet plate 4 Heat transfer tube 7 High temperature fluid inlet 8 High temperature fluid outlet 9 High temperature fluid 12 Low temperature fluid 14 Low temperature fluid flow path 15 Through hole 16 Chamber 17 Outlet

Claims (1)

(57) [Scope of request for utility model registration] 1. A heat transfer tube is supported between a high-temperature side tube sheet and a low-temperature side tube sheet provided at each end of a high-temperature fluid inlet side and a high-temperature fluid outlet side in a main body, and formed at a position between the two tube sheets. In the heat exchanger, heat is exchanged between the low-temperature fluid flowing through the low-temperature fluid flow path and the high-temperature fluid flowing through the heat transfer tube through the heat transfer tube. An annular chamber having an outlet opening to the outside of the main body is formed at an outer peripheral portion facing the high temperature fluid inlet side of the high temperature side tube sheet, and only the outer peripheral portion of the high temperature side tube sheet has the chamber and A heat exchanger comprising a through-hole for communicating with a low-temperature fluid flow path.