JPS6041961B2 - plate type evaporator - Google Patents

Description

[Detailed description of the invention] This invention relates to a plate type evaporator, and more particularly to a plate type evaporator.

This invention relates to an impinging jet plate type evaporator. The impinging jet type plate heat exchanger was developed by the applicant of the present invention in a patent application filed in 1972.
As already proposed in 527 Gin, a heat transfer plate,
a first fluid that is injected from the small holes of the injection plate and collides with the heat transfer surface of the opposing heat transfer plate; This is to exchange heat between the first fluid and a second fluid that is also injected onto the back side heat transfer surface.

The plate type evaporator according to the present invention handles the evaporation of one fluid (liquid) by such heat exchange. In this type of plate heat exchanger, the flutes constituting it are respectively a first fluid inlet side passage, a first fluid outlet side passage, a second fluid inlet side passage, and a first fluid inlet side passage. It has four through holes that serve as exit side passages for the second fluid.

In such a configuration, however, if one example is used as a plate-type evaporator for evaporating the first fluid, since there is only one outlet side passage for the first fluid, Inevitably, the generated vapor and the remaining unevaporated liquid mix on the heat transfer surface, resulting in a so-called two-phase flow or slug flow.
As a result, dry spots covered with steam are formed everywhere on the heat transfer surface, and in these areas, contact between the liquid to be evaporated and the heat transfer surface is cut off, and heat transfer is significantly inhibited. In view of the above-mentioned circumstances regarding this type of plate type evaporator, the present invention provides an impinging jet type plate type evaporator with excellent heat transfer performance, which allows evaporated vapor to be actively separated from unevaporated liquid on a heat transfer surface. The purpose is to provide an evaporator.

The structure of the present invention for achieving this object will be described in detail below based on embodiments shown in the drawings. In FIGS. 1 and 2 showing one embodiment of the present invention, 1 and 2 are heat transfer plates, and 3 and 4 are injection plates.

Each plate has four holes at the four corners and one hole at the top of the heat transfer surface. Among them, 5 is a heating medium inlet side passage, 6
is the same exit side passage. 7 is an inlet passage for the liquid to be evaporated; 8
9 is an outlet passage for the evaporated vapor of the liquid to be evaporated, and 9 is an outlet passage for the remaining unevaporated liquid.

The spray plates 3, 4 have a large number of small holes 10 formed in order to spray the liquid to be evaporated. Incidentally, since the injection plate is not directly involved in heat transfer between the two fluids, it does not require any special material; for example, it is possible to use a material with low thermal conductivity such as plastic. By superimposing these plates as shown in the figure, plate gaps are formed which serve as a supply space A for the liquid to be evaporated, an ejection space B1 for the liquid to be evaporated, and a supply space C for the heating medium, respectively.

Each space is defined by a gasket shown in bold in the figure attached to the plate gap. In the plate gap between the heat transfer plates 1 and 2, a gasket 11 is arranged around the heat transfer surface so as to surround the heat transfer surface, the heating medium passages 5 and 6, and the evaporated steam outlet passage 8. has been done. The evaporated steam outlet passage 8 is separated from the heat transfer surface by a gasket 12. The inlet passage 7 for the liquid to be evaporated and the outlet passage 9 for the unevaporated liquid are separated from the outside by gaskets 13 and 14, respectively. Thus, a heating medium supply space C that communicates only with the heating medium passages 5 and 6 is defined. In the plate gap between the heat transfer plate 2 and the injection plate 3,
A gasket 15 surrounds the heat transfer surface to provide an inlet passage 7 for the liquid to be evaporated, an outlet passage 8 for the evaporated vapor, and an outlet passage 9 for the unevaporated liquid.
It is arranged so as to surround the The inlet passage 7 for the liquid to be evaporated is separated from the heat transfer surface by a gasket 16. The heating medium passages 5 and 6 are fitted with gaskets 17 and 1, respectively.
It is cut off from the outside world at 8. Thus, an ejection space B for the liquid to be evaporated is defined, which communicates with the evaporated vapor outlet passage 8 and the unevaporated liquid outlet passage 9. In the plate gap between the injection plates 3 and 4, a gasket 19 is arranged to surround the inlet passage for the liquid to be evaporated, the outlet passage 8 for the evaporated vapor, and the outlet passage 9 for the unevaporated liquid. The evaporated vapor outlet passage 8 and the unevaporated liquid outlet passage 9 are separated from the center of the plate by gaskets 20 and 21, respectively. The heating medium passages 5 and 6 are separated from the outside by gaskets 17 and 18, respectively. Thus, a supply space A for the liquid to be evaporated is formed which communicates with the inlet passage 7 for the liquid to be evaporated. This space A communicates with the above-mentioned ejection space B for the liquid to be evaporated through the small hole 10 of the ejection plate 3. In the plate gap between the injection plate 4 and the heat transfer plate 1, like the plate gap between the heat transfer plate 2 and the injection plate 3 described above, there is communication through the small hole 10 of the injection plate 4, and the evaporation A liquid ejection space B is formed which communicates with the vapor outlet passage 8 and the unevaporated liquid outlet passage 9.

In the above configuration, the operation of the plate type evaporator of the present invention will be explained in accordance with the flow systems of the heating medium, the liquid to be evaporated, and the evaporated vapor, which are indicated by thin lines, chain lines, and broken lines, respectively. First, the heating medium is distributed and supplied to each heating medium supply space C through the heating medium inlet passage 5 that is aligned across all the plates, flows down the space, and flows out to the outlet passage 6. .

First, the liquid to be evaporated is distributed into each supply space A through its inlet passage 7.

The liquid to be evaporated that has flowed into the supply space A is
through the small holes 10 of It is heated and evaporated by the above-mentioned heating medium flowing through the supply spaces C and C. This evaporated vapor flows out into the evaporated vapor outlet passage 8 above the heat transfer surface. Further, the unevaporated liquid that has not been evaporated flows down along the heat transfer surface and flows out into the outlet passage 9 at the lower part. Next, another embodiment of the present invention shown in FIGS. 3 to 5 will be described.

22 and 23 are heat transfer plates, 24 and 25 are injection plates, and these plates are housed in a container or shell 26 in a polymerized state, and have a space for supplying a heating medium, a space for supplying a liquid to be evaporated, In addition, a plate gap is formed which becomes a space from which the liquid to be evaporated is ejected.

That is, in the plate gap between the heat transfer plates 22 and 23, the gasket 30 is installed around the heat transfer surface so as to surround the heat transfer surface and the heating medium passages 27 and 28.
The inlet passage 29 for the liquid to be evaporated is separated from the outside by a gasket 31, thereby communicating with the heating medium passages 27 and 28, and creating a heating medium supply space C closed to the interior space of the shell 26. stipulated.

In the plate gap between the heat transfer plate 23 and the injection plate 24, the heating medium passages 27, 28 and the liquid to be evaporated inlet passage 29 are provided with gaskets 32, 33 and 31, respectively.
The shell 26 is disconnected from the outside.
A jetting space B for the liquid to be evaporated that is open to the inner space is defined.

In the plate gap between the injection plates 24 and 25, a gasket 34 is installed so as to surround the central part of the plate and the inlet passage 29 for the liquid to be evaporated.
7 and 28 are separated from the outside by gaskets 32 and 33, respectively, thereby defining a supply space A for the liquid to be evaporated that is closed to the interior space of the shell 26. In the plate gap between the injection plate 25 and the heat transfer plate 22, similarly to the plate gap between the heat transfer plate 23 and the injection plate 24 described above, the liquid to be evaporated is released to the inner space of the shell 26. An ejection space B is defined.

The injection plates 24 and 25 are arranged in parallel in the vertical direction of the plate surface and can be tilted down sideways from the central part of the plates between a large number of small holes 35 formed to eject the liquid to be evaporated. A protruding piece 36 is provided.

This projecting piece 36 protrudes from the surface of the injection plate toward the injection space B side, and is used for injection. The injection plates 24, 25 may be integrally press-molded, or a separate strip member may be attached to the injection plates 24, 2.
Obtained by fixing to 5. The protruding height of the protruding piece 36 is such that the protruding end 37 of the protruding piece 36 touches the mating heat transfer plate 23 when the plates are superposed.
, 22, and the slave. Accordingly, a liquid collection groove as indicated by the reference numeral 38 is formed in the corresponding contact portion. The operation of the above embodiment will be explained in accordance with the flow system of each fluid as follows.

As shown by the thin line in FIG. 3, the heating medium is distributed and supplied into each supply space C through the heating medium inlet side passage 27, flows down inside the space C, and flows to the outlet side at the lower part. It flows out into the passage 28.

The liquid to be evaporated is distributed and supplied into each supply space A through the inlet side passage 29 for the liquid to be evaporated, as shown by the chain line.

The liquid to be evaporated that has flowed into the supply space A is sent to the injection plate 24.
The heat transfer plates 23 and 2 are injected into the adjacent ejection spaces B and B through the small holes 35 of
It collides with the heat transfer surface of 2. At that time, it is heated and evaporated by the aforementioned heating medium flowing through the adjacent supply spaces C and C via the heat transfer plates 23 and 2-2. The remaining unevaporated liquid that has not been completely evaporated is as shown in Figure 5.
The liquid collecting groove 38 is formed at the contact portion between the tip 37 of the protruding piece 36 of the injection plate 24 and the heat transfer plate 23 along the diagonal descending direction of the protruding piece 36, and the liquid collecting groove 38 The liquid falls from the inclined end and is discharged from the drain port 39 provided at the lower part of the shell 26. On the other hand, the subsequently generated vapor fills the remaining space 40 in the ejection space B with the shell 2 without mixing with the liquid to be evaporated or the liquid that has not been evaporated.
6 and is discharged from the exhaust port 41 provided at the top of the shell 26 . As described above, according to the present invention, evaporated vapor and unevaporated liquid are each guided to separate outlets,
However, since the evaporated vapor is at a higher level at the outlet, the subsequent vapor and unevaporated liquid flow in opposite directions on the heat transfer surface, and the vapor separates from the liquid and flows toward the upper outlet. The unevaporated liquid flows downward toward the outlet under the action of gravity.

As a result, the liquid to be evaporated on the heat transfer surface comes into contact with the heat transfer surface without being hindered by steam as in the conventional case, and is evaporated by laminar heat transfer.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a plate group showing a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a main part of the plate group in a superposed state, and FIG. 3 is a second embodiment of the present invention. FIG. 4 is a longitudinal sectional view of a plate type condenser of the second embodiment, and FIG. 5 is a longitudinal sectional side view of a main part of the plate in the second embodiment.

Claims (1)

[Scope of Claims] 1. A heat transfer plate including a heat transfer plate and an injection plate having a large number of small holes, the liquid to be evaporated is ejected from the supply space of the heat transfer plate through the small holes of the injection plate into the ejection space, and the liquid is ejected to adjacent and opposite sides. An impinging jet type plate type evaporator in which the heat transfer surface of a heat plate collides with the heating medium in an adjacent heating medium supply space through the heat transfer plate to exchange heat and evaporate the heating medium. The evaporated vapor outlet is provided separately and at a higher level than the unevaporated liquid outlet, so that the evaporated vapor is actively separated from the liquid to be evaporated on the heat transfer surface. Plate type evaporator. 2. Claim 1, characterized in that an evaporated vapor outlet hole and an unevaporated liquid outlet hole are provided in the upper and lower parts of each plate in communication with the ejection space for the liquid to be evaporated. plate type evaporator. 3. The plates are accommodated in the shell in a polymerized state, and the ejection space for the liquid to be evaporated is open to the inner space of the shell, and the upper and lower parts of the shell are provided with:
A plate type evaporator according to claim 1, characterized in that an outlet hole for evaporated vapor and an outlet hole for unevaporated liquid are provided.