JPH0579281U - Plate fin type heat exchanger - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the header mounting part on the fluid inlet side of the plate fin type heat exchanger from being destroyed by thermal stress. [Structure] The headers 15 and 19 on the fluid inlet side attached to the plate fin type heat exchanger body 1 are attached to the outer header portion 15
a, 19a and the inner header portions 15b, 19b have a double structure. Outer header portions 15a and 19a and inner header portion 15
Spaces 15c and 19 in which fluid can stay between b and 19b
form c. The inner header portions 15b and 19b are not in contact with the heat exchanger body 1. The outer header portions 15a and 19a are attached to the heat exchanger body 1. Inner header 15b, 1
A part of the fluid supplied to 9b passes through the gaps 18 and 20 and enters the space portions 15c and 19c and stays there. As a result, the temperature difference between the outer header portions 15a and 19a of the heat exchanger body 1 is reduced, and the stress of the mounting portions 17 and 21 is relieved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plate-fin heat exchanger used in fuel cell power generation facilities and other petroleum, chemical, and energy fields.

[0002]

[Prior Art]

 In recent years, development of high performance and compact plate fin type heat exchanger has been promoted.

In this type of plate fin type heat exchanger, as shown in an example in FIGS. 3 to 5, a plurality of partition plates 2 and fins 3 made of corrugated plates bent in a square wave shape are alternately laminated. , The space formed between the partition plate 2 and the fins 3 for each layer is alternately set as the low temperature side flow path 4 and the high temperature side flow path 5 for each layer, and the low temperature side flow path 4 is at one end side. At the other end, the low temperature fluid 6 is bent at an angle of 90 degrees so that the low temperature fluid 6 flows in a Z shape, and at the same time, the high temperature side flow path 5 has a direction opposite to the low temperature side refraction direction on the one end side and the other end side. The heat exchanger main body 1 is constructed such that the high-temperature fluid 7 is made to flow in a Z-shape by being refracted as described above. Further, one end of each side of the heat exchanger main body 1 has a low-temperature fluid inlet side. A header 8 and a header 9 on the high temperature fluid inlet side are provided, and a low temperature fluid outlet side is provided on the opposite side of both ends. 1 has a header 10 and a header 11 on the high temperature fluid outlet side. Reference numerals 12 and 13 denote plates arranged vertically, and 13 denotes a side bar.

In the plate fin type heat exchanger configured as described above, the low temperature fluid 6 is discharged from the header 8 on the inlet side to the header 10 on the outlet side through the inside of the low temperature side flow path 4, while the high temperature fluid 7 is discharged at the inlet. Side header 9 passes through the high temperature side flow path 5 and is discharged to the header 11 on the outlet side, during which the low temperature fluid 6 and the high temperature fluid 7 that flow in a counter flow through the partition plate 2 exchange heat and the low temperature fluid 6 Is heated and discharged, and the hot fluid is cooled and discharged.

[0005]

[Problems to be solved by the device]

 However, when the above-mentioned conventional plate fin type heat exchanger is operated harshly, the attachment portions (welded portions) of the headers 8 and 9 to the heat exchanger body 1 may be destroyed by thermal stress. That is, to the heat exchanger, the low temperature fluid 6 is introduced from the header 8 on the low temperature fluid inlet side and the high temperature fluid 7 is introduced from the header 9 on the high temperature fluid inlet side. If the temperature difference between the heat exchanger bodies becomes large, the mounting portions 14 of the headers 8 and 9 may be destroyed by thermal stress.

Therefore, the present invention is intended to prevent the header mounting portion on the fluid inlet side from being destroyed even if the temperature difference between the incoming fluid and the plate fin type heat exchanger body is large. is there.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has a structure in which fins and partition plates are alternately laminated, and the space formed by the fins and partition plates is used as a low temperature side flow path and a high temperature side flow path for each layer. In a plate fin type heat exchanger with headers attached to the inlet and outlet sides of a low-temperature fluid and the inlet and outlet sides of a high-temperature fluid of a heat exchanger body, The headers on the inlet side of one or both of the fluids have a double structure, the outer header part is attached to the heat exchanger body, and the inner header part is positioned with a slight gap in the heat exchanger body. The fluid is designed to enter the inside of the inner header directly.

[0008]

[Action]

 Since the fluid that has entered the inner header portion enters and stays inside the outer header portion through the gap between the inner header portion and the heat exchanger body, The temperature difference from the main body of the heat exchanger is small, and the mounting part of the outer header will not be destroyed even when used under severe temperature conditions.

[0009]

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention, in which the partition plates 2 and the fins 3 are alternately arranged as in the conventional plate fin type heat exchanger shown in FIGS. 3 to 5. The low-temperature fluid 6 and the high-temperature fluid 6 are laminated on one side of the heat exchanger body 1 in which the space formed by the partition plates 2 and the fins 3 is alternately formed in each layer as the low-temperature side flow passage 4 and the high-temperature side flow passage 5. A header 8 on the low temperature fluid inlet side and a header 9 on the high temperature fluid inlet side are provided so that the fluid 7 flows in a counter flow, and a header 10 on the low temperature fluid outlet side and a header 11 on the high temperature fluid outlet side are provided on the opposite side. In the structure in which the above is provided, those corresponding to the header 8 on the low temperature fluid inlet side and the header 9 on the high temperature fluid inlet side have a double structure. That is, the header 15 on the cryogenic fluid inlet side is concentrically arranged with a cylindrical outer header portion 15a having a large diameter and a cylindrical inner header portion 15b having a small diameter and a short length. And has a double structure in which a space portion 15c in which fluid can be retained is formed between both header portions 15a and 15b, and the low temperature fluid inlet pipe 16 is penetrated through the outer header portion 15a, and then opened inside the inner header portion 15b. The outer header portion 15a and the inner header portion 15b are integrated by fixing the header portions 15b and 15a of the above to the cryogenic fluid inlet pipe 16 by welding, and the outer header portion 15a is attached to the heat exchanger body 1. Although the mounting portion 17 is fixed by welding, the inner header portion 15b is brought into a non-contact state so as to form a slight gap 18 with the heat exchanger body 1, and then comes into the inner header portion 15b. Cold flow Some of 6 to be able residence enters the inside of the space portion 15c of the street outer header portion 15a of the gap between the 18.

The header 19 on the high temperature fluid inlet side also has a double structure in which a space portion 19c is formed between the outer header portion 19a and the inner header portion 19b, like the header 15 on the low temperature fluid inlet side. The portion 19a is fixed to the heat exchanger main body 1, but the inner header portion 19b has a gap 20 formed in the heat exchanger main body 1 and is in a non-contact state.

In order to perform heat exchange between the low temperature fluid 6 and the high temperature fluid 7, when the low temperature fluid 6 is supplied to the header 15 on the low temperature fluid inlet side and the high temperature fluid 7 is supplied to the header 19 on the high temperature fluid inlet side, The fluid 6 flows from the header 15 into the low temperature side flow passage 4 of each layer, and then flows out to the discharge side header 10 and is discharged, while the high temperature fluid 7 flows from the header 19 into the high temperature side flow passage 5 of each layer. After entering and flowing, it exits the header 11 on the discharge side and is discharged. During this time, heat is transferred through the partition plate 2 to exchange heat between the low temperature fluid 6 and the high temperature fluid 7, the low temperature fluid 6 is heated and its temperature is raised, and the high temperature fluid 7 is cooled. Can be lowered.

In the above heat exchange operation, if the temperature of the low temperature fluid 6 is extremely low and the temperature of the high temperature fluid 7 is very high, the header 15 on the low temperature fluid inlet side will be used. The temperature difference between the low temperature fluid 6 supplied to the heat exchanger main body 1 and the heat exchanger main body 1 becomes very large, but the inner header portion 15b into which the low temperature fluid 6 is introduced is not in contact with the heat exchanger main body 1. There is no thermal stress acting between them, and the outer header portion 15a is attached to the heat exchanger body 1, but the inner header is provided in the space portion 15c inside the outer header portion 15a. Since part of the low temperature fluid 6 introduced into the portion 15b enters through the gap 18 and stays therein, the temperature of the staying low temperature fluid 6 becomes higher than the temperature of the low temperature fluid in the inner header portion 15b. The outer head The temperature difference between the duck portion 15a and the heat exchanger body 1 becomes small. As a result, the stress acting on the mounting portion 17 of the outer header portion 15a can be relieved, and the mounting portion 17 can be prevented from breaking.

On the other hand, even when the fluid 7 having an extremely high temperature is supplied to the header 19 on the high temperature fluid inlet side, the temperature difference between the supplied high temperature fluid and the heat exchanger body 1 becomes large, but The inner header portion 19b in contact with the fluid 7 is not in contact with the heat exchanger main body 1, and the temperature difference between the outer header portion 19a in which the high temperature fluid is retained and the heat exchanger main body 1 is small. It is possible to relieve the stress of the mounting portion 21 of the portion 19a.

As described above, in the header 15 to which the low temperature fluid 6 is supplied and the header 19 to which the high temperature fluid 7 is supplied, the inner header portions 15b and 19b are separated from the heat exchanger body 1, and the outer header portions 15a and 19a are separated. Since the fluid is retained inside the outer header portions 15a and 19a by being attached to the heat exchanger body 1, each attachment portion 17 of the outer header portions 15a and 19a can be used even when used under severe temperature conditions. It becomes possible to relieve the stress of 21 and, and it becomes possible to use it under severe temperature conditions.

In the above embodiment, the case where both the header 15 on the low temperature fluid inlet side and the header 19 on the high temperature fluid inlet side have a double structure is shown, but only one of them has a double structure. Alternatively, the headers 15, 19, 10, 11 on the inlet side and the outlet side of the low-temperature fluid 6 and the high-temperature fluid 7 may have their cylindrical axial directions parallel to the longitudinal direction of the heat exchanger body 1. However, the headers 15, 19, 10, 11 may be turned by 90 degrees so that the tubular axial direction is the stacking direction of the partition plates 2, and the like. Of course, various modifications can be made without departing from the scope of the present invention.

[0017]

[Effect of the device]

 As described above, according to the plate fin type heat exchanger of the present invention, the header on the low temperature fluid inlet side and / or the header on the high temperature fluid inlet side has a double structure, and the inner header portion and the outer header portion are formed. A space in which the fluid stays is provided between the heat exchanger body and the inner header section so that the inner header section is not in contact with the heat exchanger body, and the outer header section is attached to the heat exchanger body. Since the fluid in the inside header section is allowed to enter and stay in the outside header section, even if the temperature difference between the fluid supplied to the inside header section and the heat exchanger body is large, The inner header portion can move freely, and the temperature difference between the outer header portion where the fluid stays and the heat exchanger body can be reduced, so that the stress acting on the mounting portion of the outer header portion can be relieved, This makes it strict Use at temperatures allowing, Ru obtain an excellent effect that.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a plate fin type heat exchanger of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a partially cut plan view showing an example of a conventional plate fin type heat exchanger.

FIG. 4 is a side view of FIG.

5 is an enlarged view taken along the line AA of FIG.

[Explanation of symbols]

 1 Heat Exchanger Main Body 2 Partition Plate 3 Fin 4 Low Temperature Side Flow Path 5 High Temperature Side Flow Path 6 Low Temperature Fluid 7 High Temperature Fluid 10 Low Temperature Fluid Outlet Header 11 High Temperature Fluid Outlet Header 15 Low Temperature Fluid Inlet Header 15a Outer Header Part 15b Inner header part 15c Space part 17 Attachment part 19 High temperature fluid inlet side header 19a Outer header part 19b Inner header part 19c Space part 21 Attachment part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Tetsuya Hirata Inventor Tetsuya Hirata 3-15-15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center

Claims (1)

[Scope of utility model registration request] 1. A low temperature fluid of a heat exchanger main body, in which fins and partition plates are alternately laminated, and a space formed by the fins and the partition plates is provided as a low temperature side flow path and a high temperature side flow path for each layer. In a plate fin type heat exchanger having headers attached to the inlet side and the outlet side and the hot fluid inlet side and the outlet side, respectively, in the header of the low temperature fluid inlet side and the header of the high temperature fluid inlet side, Both or one of them has a double structure, and a space where fluid can be retained is formed between the inner header part to which the fluid is supplied and the outer header part outside thereof, and only the outer header part is the heat exchanger main body. A plate fin type heat exchanger having a structure attached to a plate fin type heat exchanger.