JPS5932793A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To extend the life of the titled heat exchanger by a method wherein a separator permitting fluid to flow freely without changing the fluid channel is provided on the central part of the plate type heat exchanger while the heat transfer plates are fixed holding the separator with their heat transfer surfaces turning back to back with each other. CONSTITUTION:The heat transfer surfaces 15, 16 of the 1-n/2-th heat transfer plates A, B are turned toward the fixed frame side and the fluid channels 17a, 18a are located upward while the heat transfer surfaces of the n/2+1-n-th heat transfer plates A, B are turned toward the movable frame side and the fluid channels 17a, 18a are located downward to be laminated alternately for assembling. The corrosive fluid flows on the heat transfer surface 15 through the fluid channel 17a of the 1-n/2-th heat transfer plate A while said fluid flows on the heat transfer surface 15 through the fluid channel 19a of the separator 14 and the n/2+1-n-th fluid channel 17c as shown by the thin lines. Even if the heat transfer plates are partly corroded, the life of heat exchanger may be extended by means of replacing the heat transfer plates holding the separator 14 while making those plates turn over.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plate heat exchanger with a long service life.

As shown in Figures 1 and 2, the plate heat exchanger has fluid passages (2a), (2b), (2Q), and (2d) formed at the four corners, and various uneven patterns are applied to the surface. Heat transfer surface (3)
A gasket (
4) Two types of heat exchange channels (7) and (8) are alternately constructed by stacking them alternately in the same direction via 4γ.

Then, high-temperature fluid is caused to flow through one of the heat exchange channels (7) (7) from the fixed frame (5) side as shown by the thin line, and the low-temperature fluid is caused to flow through the movable frame (as shown by the chain line).
Heat exchange is carried out by flowing through the other heat exchange channels (8) (8) from the 6) side.

In such a heat exchanger, when a 1M, highly corrosive fluid is heat exchanged, a brake that comes into contact with the high temperature fluid} (1) (1
)' is corroded over time as shown in Figure 6, resulting in a shortened service life. )(1)' When some parts of... are sufficiently corroded, disassemble the heat exchanger and remove each heat transfer plate}(1)(]
)'... were inverted 1800 degrees and assembled without changing the assembly order, and heat exchange was performed again. In this way, the high-temperature fluid supplied from the fixed frame (5) side flows through the other heat exchange channels (8), (8), and the low-temperature fluid supplied from the movable frame (6) side flows through the other heat exchange channels (8) (8)... Heat exchange is carried out by flowing through one heat exchange channel (7) (7)..., and the high temperature fluid flows through the heat transfer plate}(].>(t7・
If'4 new contact surface! Since the heat exchanger will be eaten away, the life of the heat exchanger as a whole can be extended.

However, in the above method, the gas get (4) (4Y) which is installed in the play}(1)(].)'... is formed with the advantage of being highly corrosion resistant. If the type of fluid to be heat exchanged is different, for example, the high temperature fluid is corrosive and the low humidity Mt body does not have corrosion ↑'L, is it an effective method? There were some cases where the Rogeki method could not be applied.

That is, when the heat exchange fluid rises, the heat transfer plate (1) (1)' is equipped with a small gas get (1) and a gas get (4) (both together in a single eye) as shown in Figure 4. 3, but the corrosive fluid sealing part (4a) (4hf
Is it possible to improve the corrosion resistance of Jl? formed and corrosive
Fluid seal} fR'yj (4b) (4b5 to 1
In a heat exchanger using such a mixed type sword socket, which is formed in a series by ordinary scraping, when the heat transfer plate is reversed 180', the flow path of the main body is changes, and the gas get seals the corrosive fluid in the part formed of a material that does not have corrosion resistance, and the gasket corrodes while the heat transfer plate corrodes. There were drawbacks such as leakage.

In view of the above-mentioned drawbacks of the conventional plate heat exchanger, this invention improves and eliminates them, and allows the fluid to flow freely in the central part of the heat transfer plates that are screwed together without changing the flow path. By providing a partition plate that allows circulation, and by changing the direction of the heat transfer surface of the heat transfer plate in front of the partition plate,
If you sandwich the partition plates and rearrange the heat transfer plates, the property of the fluid T
To provide a device capable of extending its life by always matching I with the properties of a sealing part of a casket.

Examples of the present invention will be explained below with reference to the drawings.

As shown in Fig. 6, the plate type heat exchanger toilet of the present invention has a heat transfer plate (B) and a gasket between the fixed frame (5) and the DJiliQ frame (6).
12) (+3) A partition plate (14) may be constructed by connecting a large number of them alternately, or a partition plate (14 ), and the heat transfer plates (A) sandwich the partition plate 04) and have the heat transfer surfaces (+5) (]6) of each heat transfer plate (A+(B)) oriented in different directions before and after the partition plate 04). Fluid passages (1
7a) (]-7b) (17c) (17d), and various uneven patterns (not shown) are formed on the heat transfer surface (15). Similarly, the heat transfer plate (B) has fluid communication at the four corners h'i'+(18a)(18b)(18C)(].8d
), and heat transfer i{1i (1+jlk. is to form a gate convex frame (not shown).This heat transfer plate 1-(A) and (B) are ILL GV 180° inversion points} It has a good feeling.

Kasuketsu equipped with heat transfer plate｝FA) I-<)2
), for example, a pair of fluid passages (17a.) (1'7c)
and the heat transfer curve 05), and the other fluid paths (17b) and (17d) are sealed. Therefore, the seal portion (12a) of the heat transfer passage (12a) is formed of a material with excellent corrosion resistance, and the fluid passage (17b) (
Ko. The seal portion (12b) of 7d) is made of a material that does not have corrosion resistance.

Gasket α3) attached to the heat transfer plate (B)
is a pair of fluid passages (18b) (Y, 8d) and a heat transfer surface 0
6) and the other fluid passageway (18a).
(18c) is sealed. And the heat transfer surface (1
The seal portion (13a) of 6) is made of a material that does not have corrosion resistance, and the seal portion (13b) of the fluid passages (18a) (18c) is made of a material that has excellent corrosion resistance.

The partition plate 0 is formed of a flat plate, and there are fluid passages (1
9a) (19b) (19c) (19d) are formed. and the fluid passages (19a) (19b) (19c)
Seal parts 20(a) with corrosion resistance and seal parts 20(a) with no corrosion resistance at the front and back of the partition plate (4) (19d)
It is sealed at 0(b)--.

To assemble the heat exchanger with the above configuration, initially, the fixed frame (
5) 1st to 4th heat transfer plates interlocked between the partition plate α } (A) (B) heat transfer lIIJ (d) α6
) toward the fixed frame (5), and the fluid passage g? a
) (1lb), (18a) and (18b) are positioned on two sides of -1 and are alternately connected through the gasket }032J (+3), and the partition plate 0-curvature and the river motion frame (6) are connected. Plan placed between + 1st to nth heat transfer plates} (A) f
The heat transfer surface of B) is directed toward the movable frame (6), and the fluid passages (1'7'a) (].7b), (18a) (18b
) with the gasket } (12) (1.
3) Alternately overlap and assemble through the

In the assembled state, the partition plate 0 has the tortoise heat transfer plate (B) and the bottle + 1st heat transfer plate (A).
It is in close contact with the back side of the partition plate 0→, so that fluid does not flow in front of or behind the partition plate 0→.

The high temperature corrosive fluid supplied from the fixed frame (5) flows through the fixed frame (5) as shown by the thin line.
Between and the partition plate 0→, that is, 1~! 2 heat transfer plates} (A) and (B), each fluid passage (17
a) Pass through (18a) and connect to the partition plate (river fluid passage Q-9a).
) between the partition plate (4) and the movable frame (6), that is. %+Heat transfer play from 1st to nth} (A) ω)
Between 'l'II/ll+11-]L A0 Rere II
Heat transfer surface (+5) of odd-numbered heat transfer plate} (A) flows downward from the top through fluid passage (1'70) (18c) of panoramic view I, and is supplied from the movable frame (6) side. As shown by the chain lines, the non-corrosive fluid that is Fluid passage (17
b) Pass through (18b) and connect the fluid passageway (19d) with the partition plate 0 slope.
), and further between the partition plate 04) and the fixed frame (5), that is, between the 1st and 2nd heat transfer plates (A) and (B), the respective fluid passages (7+i) (1sa) are connected. The heat is transferred through the even-numbered heat transfer plates (B) [j (16) and heat exchange is performed.

When the above heat exchange is performed continuously for a certain period of time, the corresponding portions of each heat transfer plate (A) and (B) are corroded. This corrosion occurs between the identification frame (5) and the partition plate (
14), the fractional heat transfer plates from 1st to 312th (A) are corroded, and two parts of the heat transfer surface 05) near the fluid passage (17a) are corroded, plate(
In B), the upper part of the back surface near the fluid passage (18a) is corroded. On the other hand, between the partition plate 0→ and the town motion frame (6), the upper part of the heat transfer plate cA) near the fluid passageway (17c) is corroded in the odd-numbered heat transfer plates cA) from +1 to nth. The upper part of the back surface near the even-numbered heat transfer plate (the fluid path (18o)) is corroded. If corrosion occurs as described above, the heat exchanger will be disassembled and the Flip the heat transfer plates (A) and (B) up to the nth by 180° vertically so that the fluid passages (17a) and (18a) are positioned upward in the i direction, and the direction of the heat transfer inJ05) and (16) is reversed. In this state, overlap the fixed frame (5) and the partition plate (14), and heat transfer plates 1 to 1} (A) (E) 1800 up and down to position the fluid passages (]-7a) (18a) downward, and also face the heat transfer surface 06) toward the movable frame (6), and in this state, connect the partition plate 0 and the moving frame ( 6) and assemble them together. Then, when heat exchange is performed again, the corrosive fluid with a temperature of t% supplied from the fixed frame (5) side is heated by +1
It flows from the fluid passage (l7a) of the odd-numbered heat transfer plate (A) up to the n-th through the heat transfer surface α5), and flows between the partition plate θ4) and the movable frame (6) tonneau "'C 1~,/2" Fluid passages (17o) of odd-numbered heat transfer plates (A) up to
The non-corrosive fluid flows from the movable frame (6) side to the heat transfer surface (5) and is supplied from the movable frame (6) side.
) and the partition plate 0→, the even-numbered heat transfer plates from 1st to 4th} (B) are
16), and between the partition plate 04) and the fixed frame (5), the even numbered heat transfer plates (4+1 to nth)
B) flows from the fluid passage (18b) through the heat transfer surface (l6),
Heat exchange takes place.

During this heat exchange, all the high Af corrosive fluid flows through the fluid passages (18a) or (18c) of the odd-numbered heat transfer plates (A) and the even-numbered heat transfer plates (B). Since the non-corrosive fluid flows on the heat transfer surface (l6) of the even-numbered heat transfer plate (B), the corrosive fluid flows through the casket (12) (13) of the seal with excellent corrosion resistance and corrosion resistance. The gaskets (12a) and (13b) are sealed to prevent fluid leakage due to corrosion of the gaskets (11) and (13).
Between the partition plate 0 and the partition plate 0, the new surface of the upper part of the heat transfer rfrj (+5) near the fluid passage (17a) of the odd-numbered heat transfer plate (A) from +1 to nth is corroded, and the partition plate O
The new surface on the upper part of the heat transfer direction (15) near the fluid passage (17c) of the odd-numbered heat transfer plate (1 to 2) between the slope and the town moving frame (6) is corroded. This greatly extends the life of the heat exchanger as a whole.

As explained above, the present invention provides a plate heat exchanger in which a large number of heat transfer plates are stacked one on top of the other through gaskets to form alternately two-thread heat exchange passages. A partition plate is provided that allows fluid to freely flow without changing the flow path, and the heat transfer surfaces of the front and rear heat transfer plates are oriented oppositely to each other by sandwiching the partition plate. A casket made of several kinds of materials is attached to the heat transfer plate, and even if a part of the heat transfer plate is corroded by flowing a highly corrosive fluid, the transfer between the front and back around the partition plate is maintained. By reversing the direction of the heat transfer surface of the heat plate and replacing it, the fluid flows through the heat transfer surface of the same heat transfer plate, so it is possible to perform a seal appropriate to the fluid, and it is also possible to replace the heat transfer plate by reversing the direction of the heat transfer surface. Since the heat transfer surface of the heat plate becomes a new surface that has not been corroded, the corrosion of the corroded part of the previous stage does not progress, and the entire plate can be corroded evenly over a long period of time, resulting in a faster life of the heat exchanger. can be significantly improved.

[Brief explanation of drawings]

Figure 1 is a side view of the configuration of a conventional general heat exchanger;
The figure is an exploded perspective view of the main parts of the heat exchanger, Figure 6 is a side view schematically showing a corroded heat transfer plate, and Figure 4 is a heat transfer plate equipped with a gasket made of multiple materials. A perspective view, FIG. 5 is an exploded perspective view of the main parts of the heat exchanger according to the present invention, FIG. 6 is a side view schematically showing the corroded state of the heat transfer plate, and FIG. 7 is a rearrangement of the heat transfer grates. (A) ω) Heat transfer plate, (5) Fixed frame, (6) PJ moving frame, (12. 1 (13)...Gas get, 04
)...Partition plate, (1.5) (16)...Heat transfer jnT
o~4951

Claims (1)

[Claims] (1) In a grate type heat exchanger in which a large number of heat transfer plates are overlapped via gaskets to form alternately two-thread heat exchange flow paths, a fluid flow path is provided at the center f9li of the heat exchanger. A plate heat exchanger characterized in that a partition plate is provided that allows fluid to flow freely without change, and the heat transfer surfaces of the front and rear heat transfer plates are oriented oppositely to each other by sandwiching the partition plate. .