JPS59191897A - Multitubular heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the titled heat exchanger from wear and vibration by making each heat transfer tube in each flow-turning part in a shell body absorb heat uniformly, by providing an approach passage consisting of a buffer plate and a shell body in the flow-turning zone at the inlet port of a shell body from which a fluid from the shell side is fed into the shell. CONSTITUTION:A fluid from the shell side, flowing into a shell body 1 from an inlet nozzle 1a, is branched off by a buffer plate 2, and flowing into the primary flow-turning zone 7a as shown by an arrow A along the shell body 1 via both left and right approach passages 13a and 13b, then flowing to the direction as shown by an arrow B which is opposed to the above-mentioned direction of an arrow A. With such an arrangement, the fluid fed into the shell can flow through the all zones among a cluster 4 of heat transfer tubes, then flowing into the secondary flow-turning zone 7b as shown by an arrow C via the cutout gap 6a of a primary baffle plate 5a, and after that it flows staggeringly toward an outlet and is discharged from an outlet nozzle 1b. Accordingly, the fluid on the shell side is prevented from producing a slack water zone of swirl flow on the back of a buffer plate 2, as a result, absorption of heat of each heat transfer tube can be balanced uniformly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a shell-and-tube heat exchanger, particularly to a shell-and-tube heat exchanger used in a steam generator for a high-temperature gas furnace.

[Background of the invention]

As shown in FIGS. 1 and 2, a conventional multi-tubular heat exchanger of this kind has a body-side fluid inlet nozzle 1a and a tube plate 3a at one end, and a body-side fluid outlet nozzle at the other end. 1b and tube plate 3
a header 11 attached to the tube plate 3a and having a tube inner fluid outlet nozzle 10;
The header 9 is attached to the tube plate 3b and has a tube inner fluid inlet nozzle 8.

Inside the body 1, there is a flat buffer plate 2' provided opposite the body-side fluid inlet nozzle 1a, a heat exchanger tube group 4 attached to both tube plates 3a and 3b, and a heat exchanger tube group 4 attached to the tube plates 3a and 3b. An arbitrary number of baffle plates 5'a~ arranged at appropriate intervals so as to be perpendicular to each other.
s/n is provided. These baffle plates 5
'a-5n has notches 6, and is attached to the inner wall of the fuselage l so that these notches 6 are arranged in a staggered manner, and an arbitrary number of folded flow sections 78 to 7n are formed within the fuselage 1. It is divided into Further, the notch 6 of the baffle plate 5/a provided near the buffer plate 2' is provided on the opposite side to the buffer plate 2', as shown in FIG.

In the conventional example configured as described above, the tube-inside fluid that has flowed into the header 9 through the tube-inside flow main nozzle 8 flows through the heat transfer tube group 4 and flows into the header 11 on the other side, and then becomes the tube-inside fluid. It flows out through the outlet nozzle 10. On the other hand, the body-side fluid first flows into the first folded flow section 7a through the body-side fluid inlet nozzle la and the buffer plate 2', flows to the right, and then flows into the notch 6 of the baffle plate 5/a. After passing through, the second diversion section 7
b and flows to the left, and further flows into the third folded flow section 7C through the notch 6 of the baffle plate 5'b and flows to the right. Thereafter, the body-side fluid flows in a meandering manner through the same thread path as described above and flows out from the outlet nozzle 1b.

In this case, the body-side fluid flowing into the body 1 from the inlet nozzle 1a is divided by the buffer plate 2' to the upper and lower sides, and to the left and right sides, and is distributed along the tube plate 3a, the buffer plate 5/a, and the body 1. As a result, a large vortex stagnation area is formed behind the buffer plate 2'. Therefore, each heat exchanger tube 0″ heat of the heat exchanger tube group 4 in the first folded flow section is 77 /< 57
Producing 7 and 6〒゛! However, there are drawbacks such as wear of each heat transfer tube and generation of vibration.

[Purpose of the invention]

In view of the above, an object of the present invention is to equalize the heat absorption of each heat exchanger tube in the first folded flow section, and to prevent wear and vibration of each heat exchanger tube.

[Summary of the invention]

In order to achieve the above object, the present invention provides a buffer plate in the body that faces the body-side fluid inlet nozzle, and also arranges an arbitrary number of baffle plates at appropriate intervals so as to be orthogonal to the heat transfer tube group attached to both tube plates. The inside of the body is divided into an arbitrary number of folded flow sections, and the notches provided in each of the baffle plates are arranged in a staggered manner, and the body side fluid flows through the folded flow sections in a meandering manner. In the multi-tubular heat exchanger, the buffer plate is formed into an appropriate shape, and a guide passage is formed between the buffer plate and the body, and is provided near the inlet nozzle. The first baffle plate is disposed on the back surface of the buffer plate, and the flow direction of the body-side fluid flowing into the notch is opposite to the flow direction of the guide channel.

[Embodiments of the invention]

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

Among the symbols shown in FIGS. 3 to 9, the same symbols as those in FIGS. 1 and 2 indicate the same or corresponding parts.

In FIG. 3, reference numeral 2 denotes a buffer plate that is closely attached to the tube plate 3a and the first baffle plate 5a so as to face the inlet nozzle 1a of the body 1. As shown in FIG. It is formed in an appropriate shape, for example, an arc shape, so as to cover the notch (hole) 6a of the baffle plate 5a and have a cross-sectional width larger than the diameter of the inlet nozzle 1a. Further, guide passages 13a and 13b are formed between the buffer plate 2 and the body l. 5a to 5n are first to nth baffle plates attached to the inner wall of the fuselage 1 at appropriate intervals, and these baffle plates 5
Inside the fuselage 1 are the first to nth fold sections 7a for a to 5n.
It is divided into ~7n.

Among the baffle plates 5a to 5n, the first baffle plate 5a (the uppermost baffle plate in the figure) has a heat transfer tube hole 12 and a crescent-shaped notch (hole) as shown in FIGS. 4 and 5. 5a is provided, and the notch 6a is arranged on the back surface of the buffer plate 2. On the other hand, the second baffle plate 5b to the nth baffle plate (lowest baffle plate) 5n have the same shape as the conventional one, that is, as shown in FIG. Notches 6b of the second to nth baffle plates 5b to 5n of
The notch holes 6a of the first baffle plate 6a are arranged in a staggered manner as shown in FIG. The rest of the structure is the same as that of the conventional example shown in FIG. 1, so a description thereof will be omitted.

Since the first embodiment has the above-described configuration, the body-side fluid flowing into the body 1 from the inlet nozzle 1a is divided into the buffer plates 2, and then flows through the left and right guide channels iaa, 13.
After flowing into the first folded flow section 7a along the body 1 as shown by arrow A through passage b, it flows in the opposite direction to the direction of arrow B as shown by arrow B. Therefore, the body fluid flows over the entire area between each heat exchanger tube of the heat exchanger tube group 4, and the first baffle plate 5
The flow flows into the second folded flow section 7b as shown by the arrow C through the notch 6a of a, and thereafter flows in a meandering shape (zigzag shape) as in the conventional example (Fig. g1) and reaches the outlet nozzle lb. It leaks out.

Therefore, according to the first embodiment, it is possible to prevent the body side fluid from forming a stagnation area behind the buffer plate 2 as in the conventional example, so that the balance of heat absorption of each heat exchanger tube is equalized. In addition, by preventing the shell-side fluid from directly colliding with the heat exchanger tube group 4, wear and vibration of the heat exchanger tube group 4 can be prevented.

FIG. 7 shows the main part of the second embodiment of the present invention, that is, the upper part of the heat exchanger excluding the heat exchanger tubes.

The arc-shaped buffer plate 2 shown in the figure differs from the first embodiment only in that its upper end is attached to the body l with an appropriate gap 14 between it and the tube plate 3a, and the other structures are the same. Since there is, I will omit the explanation. With this configuration, there is no need to consider the distance between the first baffle plate 5a and the tube sheet 3a and the dimensional accuracy of the buffer plate 2, which has the advantage of ease of manufacture.

FIGS. 8 and 9 show a third embodiment of the present invention, in which a portion IA of the body l provided with the inlet nozzle 1a in the same figure is formed to have a larger diameter than the other portion IB, and The first embodiment (Fig. 3) is that the plate 2 is provided flush with the fuselage IB.
Since the other structures are the same, their explanation will be omitted. With this configuration, the body-side fluid flows through the guide channels 13a and 13b formed between the body IA and the buffer plate 2, and flows through each heat exchanger tube of the heat exchanger tube group 4 in the first folded flow section 7a. Since the heat exchanger flows slowly between the heat exchanger tubes, there is an advantage that the heat absorption of each heat exchanger tube can be made even more uniform.

〔Effect of the invention〕

As explained above, according to the present invention, by providing a guide channel formed by an appropriately shaped buffer plate and the body in the folded flow section of the body inlet into which the body side fluid flows, It is possible to equalize the heat absorption of each heat exchanger tube of the heat exchanger tube group in the folded flow section, and to improve the abrasion resistance and vibration resistance of each heat exchanger tube.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal ffr view of a conventional shell-and-tube heat exchanger, Fig. 2 is a sectional view taken along the line X-X of Fig. 1, and Fig. 3 is a cross-sectional view of the multi-U type heat exchanger of the present invention. FIG. 4 is a Y-Y line Ffr plane view of FIG. 3, FIG. g5 and FIG. 6 are 1000-sided views of the baffle plate of the first embodiment, and FIG. FIG. 8 is a vertical cross-sectional view of a main part of a second embodiment according to the present invention, FIG. 8 is a longitudinal cross-sectional view of a third embodiment according to the present invention, and FIG. 9 is a cross-sectional view taken along the line Z--Z in FIG. 1, LA, IB... fuselage, 1a... artificial nozzle, 2
... Buffer plate, 3a ... Tube plate, 5a ... First baffle plate, 6a ... Notch, 13a, 13b ... Guide flow path, 14 ... Interval Y 1 ( 2) ￥ 2 Figure 3 Opening 4 (2) Back 5 Figure 6 Figure 7 Figure 5 Yongyi δ Figure

Claims (1)

[Claims] 1. A buffer plate is provided in the body facing the body-side fluid inlet nozzle, and an arbitrary number of baffle plates are kept at appropriate intervals so as to be orthogonal to the heat transfer tube group attached to both tube plates. The interior of the body is divided into an arbitrary number of folded flow sections, and the notches provided in each of the baffle plates are arranged in a staggered manner so that the body side fluid flows through the folded flow sections in a meandering manner. In the multi-tubular heat exchanger, the buffer plate is formed into an appropriate shape, a guide passage is formed between the buffer plate and the body, and a first baffle is provided near the inlet nozzle. A cutout portion of the plate is arranged on the back surface of the buffer plate, and the flow direction of the body-side fluid flowing into the cutout portion is opposite to the flow direction of the guide channel. Tubular heat exchanger. 2. The multi-tubular heat exchanger according to claim 1, wherein an appropriate gap is provided between the tube plate on the body side fluid inlet nozzle side and the buffer plate. The diameter of the part of the body where the body side fluid inlet nozzle is installed is
2. The multi-tubular heat exchanger according to claim 1, wherein the diameter of the other body portion is larger than that of the body, and the buffer plate is provided flush with the small diameter portion of the body.