JPH0351996B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a plate stack consisting of a plurality of plates that are tightened together so that passages for a heat transfer medium and a heat transfer medium are formed alternately in a shell. This relates to a plate heat exchanger that is housed with a gap between the heat exchanger and the inside of the shell.

This type of so-called plate-and-shell type heat exchanger is generally used for heat exchange with small temperature differences. Therefore, a large number of plates are required to achieve efficient heat exchange. However, when the amount of water is reduced, especially in order to meet the demand for reducing the amount of water used in this type of heat exchanger, the amount of water per passage decreases, and therefore the flow rate decreases, and as a result, the heat transfer performance of the heat exchanger in question decreases. descend. Conventionally, to supplement this, a large number of heat exchangers were frozen in pipes, but this was extremely uneconomical. Further, from the viewpoint of heat transfer performance, it is desirable that the flow of the heat exchange medium be in counterflow, but the conventional heat exchanger of the type shown in FIG. 58
-47638), the liquid flowing into the shell 1 from the liquid inlet 2 of the shell 1 is transferred to the sealing member 10.
The liquid flows into the liquid passage A through the gap in the plate 4 that opens at a lower position, and flows into the shell 1 through the gap in the plate 4 that opens at a higher level than the sealing member 10.
The liquid is discharged to the outside from the liquid outlet 3 of the shell 1. In addition, in the drawing, 9 is a frame-shaped gasket for forming a closed heat exchange medium passage between the plates 4, 5 and 6 are the steam inlet and outlet provided in the plate 4, and 7 and 8 are the above-mentioned inlet 5. and a gasket surrounding the outlet 6 between the plates. While the liquid flows in the liquid passage A along the above-mentioned path, it exchanges heat with the vapor flowing in the adjacent passage B, which is closed to the outside. By the way, as mentioned above, in the conventional heat exchanger shown in Fig. 1, there is only one flow in which heat is transferred between both heat exchange media, and the distance, that is, the heat transfer length or path length, is approximately It is represented by l.

The present invention aims to provide a heat exchanger of the above type with excellent heat transfer performance, that is, the plate-like body has entrances and exits 5 and 6 near the upper and lower ends on the center line, respectively, and an entrance and exit 5 on one side. , 6, and a plate 4 equipped with a partition member 11 extending in the flow direction, and openings 5, 6 near the upper and lower ends on the center line of the plate-like body. A plurality of plates 4 equipped with frame-shaped gaskets 9 surrounding the entrances and exits 5 and 6 are stacked alternately and tightened together with the two frames, so that the partition member 11 is located between the plates to the outside. a liquid passage A that opens;
A plate stack 4A is constructed in which steam passages B closed to the outside are alternately formed between the plates in which frame-shaped gaskets 9 are present, and the plate stack 4 is
A is housed in the shell 1 with a gap C between the side wall of the shell 1 and the plate stack 4.
A plate laminate 4A is placed in the gap C formed between A and A.
A sealing member 10 is provided around the entire circumference of the intermediate portion of the liquid passage A that opens to the outside, and the liquid passage A that opens to the outside is separated into small passages a ₁ and a ₂ by a partition member 11 that extends along the flow direction.
one end of the partition member 11 is brought into contact with the inner wall of the shell, and the other cutout part 11a is used to open the small passage.
A ₁ and a ₂ are formed as a series of passages that extend from the liquid inlet 2 to the liquid outlet 3 and have counterflow or parallel flow to the adjacent passage B.

In some embodiments of the invention, a partition member is provided in the liquid, e.g. cooling water, passageway to divide it into a series of small passageways extending in the main flow direction of the steam. As a result, the cross-sectional area of the cooling water passage is reduced, and the flow rate of the cooling water is correspondingly increased, so that an improvement in heat transfer performance can be expected. In addition, the heat transfer length or path length through which heat is transferred between the cooling water and the steam is increased, thereby greatly improving heat transfer performance.

According to another embodiment of the invention, a liquid,
For example, the partition member provided in the cooling water passage can be made detachable. Thereby, the cross-sectional area of the cooling water passage can be changed depending on the amount of cooling water, and the adaptability or degree of freedom of the heat exchanger is greatly increased.

In addition, a stack of plates is built into the shell, in which a plurality of plates are tightened together via gaskets to alternately form liquid passages that open to the outside and vapor passages that are closed to the outside between the plates. Therefore, it is possible to take out the laminate from inside the shell and disassemble the plate laminate outside the shell, or to incorporate the plate laminate that has been tightened together outside the shell into the shell. Disassembling and assembling the exchanger becomes much easier.

Reference will now be made in detail to embodiments shown by way of example only in the accompanying drawings. In addition, the same elements are indicated by the same numbers or symbols in the drawings.

In FIGS. 2 and 3, the plate stack 4
The shell 1 containing A has an inlet 2 and an outlet 3 for cooling water. The plates 4 have an inlet 5 and an outlet 6 at the top and bottom of the center, and a plurality of plates 4 are tightly tightened together with two types of gaskets and partition members between them to form a plate stack 4A. Alternate fluid passages A, B for both heat exchange media, for example cooling water passage A and steam passage B, are formed by the plate gap. Then, the plate laminate 4A is installed in the shell 1 with a gap C between it and the shell 1 by appropriate means (not shown). The steam inlets and outlets 5 and 6 are aligned and extend perpendicularly to the plane of the drawing, and the fluid passage A is separated from the fluid passage A by round gaskets 7 and 8, and the fluid passage B is separated from the fluid passage A by a frame-shaped gasket. 9 and communicates at the end with a steam supply pipe 5a and a discharge pipe 6a (Fig. 5) provided in the shell 1, and the plate stack 4A
The upper and lower parts of the chamber constitute a steam supply path and a discharge furnace.

As shown in FIGS. 2 and 5, the cooling water passage A is open to the inner space of the shell, but from the entrances and exits 5 and 6 are round gaskets 7 and 8.
isolated by. Steam passage B is shown in Figure 3.
As shown in FIG. 5, it is closed to the inner space of the shell due to the presence of a frame-shaped gasket 9, and communicates with the steam inlets and outlets 5 and 6.
A sealing member 10 is provided between the inner wall of the shell 1 and the plate stack 4A, and prevents the cooling water from passing through the sealing member.

In FIG. 2, the partition member 11 extends in the cooling water passage A between the round gaskets 7 and 8 and between the gasket 8 and the inner wall of the shell 1, and extends between the upper round gasket 7 and the shell 1. The partition member 11 does not extend between the partition member 11 and the inner wall of the partition member 1, and forms a cutout portion 11a. This divides the cooling water passage A into a series of two small passages a ₁ and a ₂ . Both of the small passages a ₁ and a ₂ extend parallel to the main flow direction of steam between the entrances and exits 5 and 6, and therefore, in the heat exchanger, steam and cooling water flow in opposite directions or in parallel. Become.

In the above configuration, a fluid passage that opens to the outside, for example, a cooling water passage A, is formed, for example, between plates 4a and 4b, as shown in FIG. Between the plates 4a and 4b are round gaskets 7 and 8 surrounding a steam inlet 5 and a steam outlet 6;
A partition member 11 is interposed, and a predetermined gap is formed between the steam gaskets 7, 8 and the partition member 11, and this gap opens into the shell 1 over the entire circumference. Therefore, the cooling water is supplied from the inlet 2 of the lower part of the shell 1 to the lower part of the sealing member 10 attached in a honeycomb shape between the shell 1 and the plate stack 4A and in the middle of the plate stack 4A. The cooled water flows into the cooling water passage A from the opening opened at the bottom of the sealing member 10 of the cooling water passage A, ascends the small passage _a1 , and reaches the cutout part 11a.
The water then turns around and descends through the small passage _a2 , flows into the shell 1 through the lower opening of the cooling water passage A on the opposite side, and flows out from the cooling water outlet 3 of the shell 1. That is, the cooling water flowing into the lower part of the shell 1 from the cooling water inlet 2 ascends through the small passage a ₁ from the opening at the lower part of the cooling water passage A, and passes through the cutout 1 at the upper end of the partition member 11.
1a, flows down the adjacent small passage _a2 , flows into the shell from the opening at the bottom, and is discharged to the outside from the cooling water outlet 3 at the bottom on the opposite side of the shell 1. Further, a liquid passage closed to the outside, for example a vapor passage B, is formed, for example, between plates 4a and 4c, as shown in FIG. Between the plates 4a and 4c, there is a frame-shaped gasket 9 that includes ports 5 and 6 and surrounds the outer periphery of the plate, and within this frame-shaped gasket 9 is a steam passage with a predetermined gap through which steam flows. B is formed, and the steam supply pipe 5
The steam supplied from a flows through the steam passage B from the steam inlet 5 of the steam passage B, passes through the steam outlet 6, and is discharged to the outside from the exhaust pipe 6a. That is, steam flowing through steam passage B and small passages a ₁ and a ₂ of cooling water passage A
The cooling water flowing through the tubes flows in parallel or countercurrently with each other, and a heat exchange action takes place between them.

As is clear from the drawings and above,
By dividing the cooling water passage A into two small passages a ₁ and a ₂ , the cross-sectional area of this passage is halved, and the flow rate of the cooling water is doubled accordingly. Moreover, the passage length is also twice that of the conventional one shown in FIG. In this way the heat transfer performance is greatly improved. Furthermore, the second
In the embodiment shown in FIGS.
Although a ₁ and a ₂ are used, the present invention is not limited to this, and in order to achieve the object of the present invention, it is preferable to provide a partition member so as to form a plurality of small passages. FIG. 4 shows another embodiment in which the passage is divided into three small passages a ₃ , a ₄ , and a ₅ .

Of course, the partition member 11 may be of a fixed type, but it is more advantageous if it is detachable. In other words,
Untighten the plate stack with the gasket attached, and remove the partition member 11 according to the amount of cooling water.
The cross-sectional area of the cooling water passage can be changed by attaching or removing it. Therefore, if the partition member 11 is made detachable, the heat exchanger becomes extremely practical with a very high degree of adaptability and freedom.

As explained above, the plate heat exchanger of the present invention has the inlet/outlet ports 5, 6 near the upper and lower ends on the center line of the plate-like body, and the gasket 7, which surrounds each of the inlet/outlet ports 5, 6 on one side. 8 and a plate 4 equipped with a partition member 11 extending in the flow direction, and entrances and exits 5 and 6 near the upper and lower ends on the center line of the plate-shaped body, respectively.
and a frame-shaped gasket 9 attached to one side of the plate 4 that encloses the entrances and exits 5 and 6 all at once, a plurality of plates are stacked alternately and tightened together with the two frames,
A liquid passage A that is open to the outside between the plates where the partition member 11 is present, and a steam passage B that is closed to the outside between the plates where the frame-shaped gasket 9 is present.
The plate stack 4A is formed alternately with the shell side wall and the gap C.
is accommodated in the shell 1 with a gap C formed between the side wall of the shell 1 and the plate stack 4A.
A seal member 10 is provided around the entire circumference of the intermediate portion of the plate stack 4A, and the partition member 1 has the liquid passage A opened to the outside extending along the flow direction.
1 into small passages a ₁ and a ₂ , one end of the partition member 11 is brought into contact with the inner wall of the shell, and the other cutout part 11a separates the small passages a ₁ and a ₂ from the liquid inlet 2 to the liquid outlet. 3, a counterflow to the adjacent steam passage B,
Or, by creating a series of parallel flow passages,
The heat transfer performance is improved, and if the partition member is detachable, it is highly adaptable and extremely practical, and since the plate stack is constructed by tightening a plurality of plates together via gaskets, it is easy to disassemble. This has many benefits, such as ease of use.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional plate-and-shell type heat exchanger passing through a cooling water passage, and FIGS. 2 and 3 show an embodiment of the heat exchanger of the present invention. 2 is a cross-sectional view through the cooling water passage, FIG. 3 is a cross-sectional view through the steam passage, and FIG. 4 is a schematic cross-sectional view showing another embodiment of the present invention. Note that FIG. 5 is an exploded perspective view illustrating the structure of the heat exchanger of the present invention. DESCRIPTION OF SYMBOLS 1... Shell, 4... Plate, 4A... Plate laminate, 11... Partition member, A... Liquid passage, _a1 , _a2 ... Small passage, B... Steam passage.

Claims (1)

[Scope of Claims] 1. A plate having entrances and exits near the upper and lower ends on the center line of the plate, and having a gasket surrounding each of the entrances and exits on one side and a partition member extending in the flow direction attached to one side; Each plate has an entrance/exit near the upper and lower ends on the center line of the body, and a frame-shaped gasket attached to one side that surrounds the entrance/exit is alternately stacked and tightened with two frames. A plate stack is formed in which liquid passages open to the outside are alternately formed between the plates in which the partition member is present, and vapor passages closed to the outside are formed between the plates in which the frame-shaped gasket is present, The laminate is housed in the shell with a gap between the side wall of the shell and the plate laminate, a sealing member is provided around the entire intermediate portion of the plate laminate in the gap formed between the side wall of the shell and the plate laminate, and the outside The liquid passage to be opened is divided into small passages by a partition member extending along the flow direction, one end of the partition member is brought into contact with the inner wall of the shell, and the small passage is separated from the liquid inlet by another cutout. 1. A plate heat exchanger characterized by having a series of passages in which flow flows counter-currently or in parallel to an adjacent vapor passageway leading to a liquid outlet.