JPS5937576Y2 - Shell-and-tube heat exchanger - Google Patents

Description

[Detailed description of the invention] This invention prevents the occurrence of a stagnation area of the fluid on the shell side, and also improves heat transfer by forming a nearly perfect cross flow for the group of heat transfer tubes installed in the axial direction. This invention relates to a multi-tube heat exchanger with an improved shell side structure.

As shown in FIG. 1, a conventional shell-and-tube heat exchanger has a large number of heat transfer tubes 6 built into a can body 1, each having a tube plate 2 at each end.
It is fixed by 3.

Further, in the middle part of the heat exchanger tubes 6, several friction plates 7 are cut perpendicularly to the can axis for the purpose of forming a cross flow of the body side fluid, and also serve as intermediate support for the large number of heat exchanger tubes 6.

Many shapes have been devised for the jama plate 7 in the past, but in reality, from the viewpoint of manufacturing and maintenance, a cut-out circular jama plate is adopted in most cases.

The present invention aims to improve this circular baffle plate.

In FIG. 1, 4 is an inlet side liquid chamber, and 5 is an outlet side liquid chamber.

As shown in FIG. 2, the circular baffle plate has an inlet part 7a which is a part of a circular plate having an outer diameter that can be inserted into the can body 1.
Holes 7b into which a large number of heat exchanger tubes 6 can be inserted are arranged.

When using the occluded circular baffle plate 7 having this shape, the body side fluid enters the can body 1 from the inlet nozzle 1a provided in the can body 1,
After contacting and flowing in a direction perpendicular to the outer circumferential surfaces of a large number of heat transfer tubes 6, it exits from the outlet nozzle 1b.

At this time, since the jamb board-cut interiors 7a are arranged alternately, the body side fluid flows in a meandering manner within the can body, as shown in FIG. 1, while reversing the flow direction.

However, when such a circular baffle plate 7 is used, there is a stagnation area of body-side fluid at the rear A of the circular baffle plate 7 and a part B of the corner formed by the can body 1 and the circular baffle plate 7. There is a drawback that heat transfer is deteriorated due to the occurrence of an incomplete cross flow as shown in FIG. 1.

In order to prevent these drawbacks, a method is generally adopted in which the interval between the hollow circular plates 7 is made small, but when considering the pressure loss on the shell side and the vibration of the heat transfer tube, it is necessary to The area, that is, the interval between the 7 missing circular jama plates is
It is impossible to make it unnecessarily small.

The purpose of this invention is to prevent the generation of stagnant liquid in the shell side fluid by improving this circular baffle plate, and to form a nearly perfect cross flow to the heat transfer tube group, resulting in high heat transfer. The object of the present invention is to provide a shell-and-tube heat exchanger.

The present invention provides a heat exchanger having a group of heat transfer tubes in a can body and a plurality of notched circular friction plates installed perpendicularly thereto. One or more guide plates having two upper and lower inlets are installed in parallel with the grinding plate. The inner circumferential surface of the can body, the inner circumferential surface of the guide plate, and the area surrounded by the inner circumference of the circular jamb plate (excluding the cross-sectional area of the heat transfer tube) are equal to each other. This relates to a multi-tubular heat exchanger which is inserted and fixed at equal intervals.

In addition, in the present invention, in the multi-tubular heat exchanger using the above-mentioned notched circular plates, the interval between each notched circular plate is not made too small to prevent the formation of a stagnation area of the fluid on the body side. In order to prevent this and form a nearly perfect cross flow, a guide plate for the purpose of guiding the fluid on the shell side is inserted between each of the half-circular friction plates.

As shown in Fig. 3, the shape of the guide plate has two entrances 9a,
9b, and holes 9c similar to those of the circular jamb plate 7 are arranged.

One or more guide plates are inserted depending on the size of the interval between adjacent jamb plates, and are installed at a position where each streamline of the body-side fluid forms an ideal cross flow.

Furthermore, it is preferable that the inside of the guide plate be roundly bent in a direction that allows smooth streamlines of the body-side fluid.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

FIG. 3 shows a plan view of a guide plate according to an embodiment of the present invention.

The guide plate 9 is a circular plate having an outer diameter that can be inserted into the can body 1, and has two inner surfaces 9a and 9b on the outer periphery and holes 9c into which a large number of heat exchanger tubes 6 can be inserted.

The size of the inner portions 9a, 9b is not necessarily constant, but varies depending on the number of guide plates inserted in one interval between adjacent circular cross-section plates 7 (hereinafter referred to as a cross-section plate section) and the position at which they are attached.

Now, in the case where two guide plates are inserted into the jama plate section, a method of attaching the guide plates and a method of determining the size of the inside of the guide plate will be described.

In Figure 4, two guide plates 9 and 10 are placed in each section of the board, perpendicularly to the heat transfer tube, in a position that divides the section of the board into thirds, as in the case of the circular board I. This is an example in the case of insertion.

The guide plates 9 and 10 are fixed together with the circular bar plate 7 by a plate support rod 8.

FIG. 5 is a sectional view taken along line XX in FIG. 4.

Here, the area surrounded by the inner circumferential surface of the can body 1 and the inner circumference 10a of the guide plate 10 is defined as the area surrounded by the inner circumferential surface of the can body 1 and the guide plate 10.
The area surrounded by the inside part 10a of Q1 and the inside part 9a of the guide plate 9 is defined as the inner peripheral surface of the can body 1 and the inside part 9 of the guide plate 9.
Let R be the area surrounded by a and the inner part 7a of the circular jamb plate 7.

However, P, Q, and R are values excluding the cross-sectional area of the heat exchanger tube 6 included in each range.

The above entry area 9 as 10 a has each area P, Q
.

Provided at a position where all R are equal.

The positions of the other entrances 9b and 10b of the guide plates 9 and 100 are also as follows:
Determine using the same method as above.

In addition, when the guide plates 9 and 10 in FIG. The ratio of the distance U between the guide plate 9 and the jamb plate T is the area P,
Q.

Each input part 9a, 10a; 9b is made equal to the ratio of R.
, 10b.

In this case, when the body side fluid flows in a meandering manner inside the can body 1, by inserting the guide plate 9°100, the stagnation areas A and B become much smaller than in the case of Fig. 1, and are almost completely filled. A cross flow is formed.

However, similar to the stagnation area A behind the circular jamb plate 7, a stagnation area C is slightly generated behind the guide plates 9, 100.
Another method, as shown in FIG. 6, is to curve the inlet part 11a on the upstream side of the guide plate 11 in a direction that smooths the streamlines of the fluid on the body side. The occurrence of areas can be prevented.

Furthermore, as in the guide plate 12 shown in FIG. 7, if both the upstream and downstream inlets 12a and 12b are bent round in the direction that the streamlines are smooth, it is effective to reduce the pressure loss on the shell side. There is.

As mentioned above, by inserting the guide plate in the present invention,
This has the effect of making the flow velocity distribution uniform in each cross-section of the body-side fluid flow path, and therefore the stagnation area that occurs behind each occluded circular baffle plate can be significantly reduced.

In addition, almost perfect cross-flow can be obtained without forcibly reducing the cross-plate section, and by solving these problems, the heat transfer performance of the heat exchanger can be significantly improved.

[Brief explanation of drawings]

Figure 1 is a vertical cross-sectional view of a conventional multi-tubular heat exchanger, Figure 2 is a front view of a circular cross-section plate, which is the most commonly used type of heat exchanger, and Figure 3
The figure is a front view showing a guide plate which is an embodiment of the present invention.
The figure is a longitudinal sectional view showing the body of a heat exchanger according to an embodiment of the present invention, FIG. 5 is a cross-sectional view taken along the line X-X of FIG. 4, and FIGS. FIG. 2 is a longitudinal cross-sectional view showing a body of a heat exchanger according to an embodiment. Explanation of symbols: 1... Can body, 2... Tube plate, 3... Tube plate, 4... Inlet side liquid chamber (tube side), 5... Outlet side liquid chamber (pipe side), 6...
・・Heat transfer tube, I・・・・Cross-circular jamb plate, 8・・・・
... Jama plate support rod, 9 ... Guide plate, 10 ...
...Information board, 11...Information board, 12...
··Guide plate.

Claims (1)

[Scope of utility model registration request] In a heat exchanger having a group of heat transfer tubes in a can body and a plurality of circular baffle plates installed perpendicularly thereto, one sheet is installed in the middle of each of the adjacent circular baffle plates in parallel with the circular baffle plates. Or, use multiple guide boards with two upper and lower entrances.
The area surrounded by the inner circumferential surface of the can body and the inside of the guide plate (excluding the cross-sectional area of the heat transfer tube) in the same flow path cross section of the body side fluid, the inner circumferential surface of the can body, the inside of the guide plate, and the missing circle Area surrounded by the inside of the baffle plate (excluding the cross-sectional area of the heat exchanger tube)
A shell-and-tube heat exchanger whose inner parts are inserted and fixed at equal intervals so that they are equal to each other.