JPH02192593A - plate heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is an improvement of a plate heat exchanger in which heat exchange is performed indirectly between two heat exchange media via a heat transfer plate. Regarding structure.

[Conventional technology]

Conventionally, so-called shell and
When a plate type heat exchanger has a large number of heat transfer plates, the handling and tightening of the heat transfer plates when performing a pressure-tightness inspection are shown in Figure 3 for convenience in handling the heat transfer plates. As shown, a partition (2) is provided in the middle inside the shell (1), and the heat transfer plates are divided into two groups (3
L) (3R) may be inserted into the shell (1) through openings on both sides.

By the way, heat exchangers can be classified into liquid-ring liquid heat exchangers, evaporators and condensers that involve phase change, etc., depending on the state of the heat exchange medium. A flooded evaporator that uses natural convection requires a mist separator to separate the mist, and a condenser requires an aftercooler to separate non-condensable gases. be. Normally, these were installed independently from the evaporator and condenser, and connected via piping.

[Problem to be solved by the invention]

Conventionally, in order to separately install a mist separator and an aftercooler, extra space is required in addition to a heat exchanger (evaporator or condenser), and piping is also required to connect them.

Therefore, the purpose of this invention is to separate the mist when the heat transfer plate is divided into two parts in one heat exchanger and inserted and tightened into the shell in a plate heat exchanger (evaporator or condenser). Or to obtain a structure in which the separation of non-condensable gases can be carried out within the shell.

[Means to solve the problem]

This invention relates to a plate heat exchanger in which a large number of heat transfer plates are housed in a stratified state in a shell, in which a partition chamber is provided in the center of the shell to form two heat exchange chambers in the shell, and The heat plates were divided into two groups and inserted into each heat exchange chamber, respectively, and one heat exchange medium undergoing a phase change was supplied to each heat exchange chamber through the partition chamber and discharged.

Further, the upper and lower parts of the two heat exchange chambers are communicated with each other through communication passages extending across the partition chambers.

[Effect]

The compartment serves for mist separation or non-condensable gas separation,
In other words, if the heat exchange medium that undergoes a phase change is a liquid that evaporates through heat exchange with hot water, the other heat exchange medium, a mist separator can be installed near the steam outlet in the partition to prevent steam from leaving the vessel. It is possible to separate mist mixed in the steam when it is discharged. In addition, if the heat exchange medium that undergoes a phase change is steam that condenses through heat exchange with cooling water, which is the other heat exchange medium, the partition chamber is further divided into an upper chamber and a lower chamber, and the lower part is the condensate outlet side. By installing a cooling coil indoors, it can act as an aftercooler.

The other heat exchange medium is supplied through an inlet provided in the shell and is also discharged through an outlet. That is, 1
It enters one of the heat exchange chambers through two inlets, and a portion of it is distributed to the other heat exchange chamber via communication channels.

〔Example〕

Embodiments of the invention shown in the drawings will be described below.

First, FIG. 1 shows the case of an evaporator.

The shell (10) that accommodates the heat transfer plate has a partition chamber (20) defined in the longitudinal center by a pair of partition plates (21L) (21R), and heat exchange chambers (11) on both sides of the partition chamber (20).
L ) (11R) is formed. Each heat exchange room (
A series of plate groups (31L) (31R) are accommodated in each of the plate groups (31L) (11R).

In each plate group (31L) (31R), the heat transfer plate (30) is inserted through the openings on both sides of the shell (10), and the frame (12L) (12R) is inserted into the shell (10).
10), it is tightened in a stratified state.

Two heat exchange rooms (IIL) separated by a partition (20)
(IIR), upper portions and lower portions thereof communicate with each other through a communicating path (60) extending across the partition (20). The shell (10) is provided with nozzles (13) and (14) for supplying and discharging hot water. One or more upper communication passages (60) are provided so that the total cross-sectional area is approximately A of the cross-sectional area of the nozzle (13). Similarly, one or more communication passages (60) at the bottom are provided so that the total cross-sectional area is approximately the same as the cross-sectional area of the nozzle (14). If there is no phase change in the exchange chamber, nozzle (13) (14)
The cross-sectional area of can be the same.

Each heat exchange chamber (IIL) (IIR) is supplied with hot water from the nozzle (13) of the shell (10). That is, hot water supplied from the nozzle (13) first enters the heat exchange chamber (11R), but some of it enters the (60
) into the heat exchange chamber (11L”).

In the heat exchange chambers (IIL) (IIR), this hot water flows through the passage (A) between the heat transfer plates (30), merges through the communication passage (60), and flows out from the nozzle (14). Spills out of the container.

The partition chamber (20) is equipped with a nozzle (15) for supplying liquid and a nozzle (16) for extracting vapor. Furthermore, a mist separator (40) made of wire mesh or the like is installed in the upper part of the partition chamber (20). ) is installed.

The liquid supplied from the nozzle (step 5) fills the partition chamber (20) to a predetermined level, and the partition plate (21L) (21R
') through the through holes (22L) (22R) of the heat exchange chamber (
11L) (11R). Heat exchange room (11
L) (11R), this liquid passes through the passage (B) formed between the heat transfer plates (3G), while passing through the passage (B) formed between the heat transfer plates (3G), as in a normal plate heat exchanger.
A) receives and takes heat from the hot water flowing through it and evaporates.
The generated steam passes through the through holes (231,) (23R) at the top of the partition plates (21L) and (21R) into the partition chamber (20), and then passes through the mist separator (40) and exits from the nozzle (16). It is taken out of the vessel. At this time, the mist mixed in the steam is separated from the steam by changing the course of the steam almost at right angles and by the existence of the mist separator (40), and the liquid phase filling the lower part of the partition chamber (20) is separated from the mist mixed in the steam. It will be returned.

Next, FIG. 2 shows the case of a condenser.

In this case, the partition chamber does not have a mist separator, but instead is provided with a partition wall (24), which partitions the partition chamber into an upper chamber (20T) and a lower chamber (20B). There is no structural difference from that shown in FIG. 1 except for this point. Substantially the same parts are therefore designated by the same reference numerals.

However, in the case of a condenser, there is a nozzle (1
6) Steam is supplied from the partition plate (21L).
(21R) through the through holes (23L) (23R) to the heat exchange chamber (11L) (11R).
In this case, cooling water is supplied to IL) (IIR) from a nozzle (14). And the steam is transferred to the heat transfer plate (30)
While flowing through the passage (B) between them, the cooling water flowing in the adjacent passage (A) is heated and condensed, and the condensed liquid flows from the lower through holes (22L) (22R) to the lower chamber ( 20B) and taken out from the nozzle (15).

At that time, uncondensed steam and non-condensable gas that could not be completely condensed accumulate in the lower chamber (20B). A cooling coil (50) is provided in the lower chamber (20B), and uncondensed steam is further cooled and condensed. In addition,
Although not shown in the drawings, a means such as a gas vent pipe or the like is provided for appropriately removing the non-condensable gas accumulated in the lower chamber (20B).

〔Effect of the invention〕

As explained above, according to the present invention, when a large number of heat transfer plates are divided into two and inserted into one heat exchanger, a partition is provided in the middle to separate mist or non-condensable gas. Since it is used for various purposes, there is no need to install separate equipment for each purpose as in the past, and space and piping can be saved. Furthermore, the heat exchanger itself can be designed to be compact as a whole, which is advantageous in terms of maintenance.

Furthermore, since the heat exchange chambers are connected to each other by a communicating path, it is sufficient to provide one supply nozzle and one discharge nozzle for the heat exchange fluid to be supplied to these heat exchange chambers. therefore,
Compared to the conventional example shown in Figure 3, which has a total of four nozzles, one for each heat exchange chamber, piping is significantly simplified, reducing pressure loss and saving piping space. , the effect of reducing equipment costs can be obtained. This effect is particularly noticeable in high-output plants with a large number of heat exchangers and large pipe diameters.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional views of a plate heat exchanger according to an embodiment of the present invention, showing the case of an evaporator and a condenser, respectively. FIG. 3 is a longitudinal sectional view of a plate heat exchanger (evaporator) showing a conventional technique. 20: Partition chambers 21L, 21R: Partition plate 24: Partition wall 40: Mist separator 50: Cooling coil 60: Communication path

Claims (3)

[Claims] (1) In a plate heat exchanger in which a large number of heat transfer plates are housed in a stratified state within a shell, a partition chamber is provided in the center of the shell to form two heat exchange chambers within the shell,
The heat transfer plates are divided into two groups and inserted into each heat exchange chamber, and one heat exchange medium that undergoes a phase change is supplied to and discharged from each heat exchange chamber through the partition chamber,
A plate-type heat exchanger characterized in that a communication passage is provided across the partition chamber to communicate the upper and lower parts of the two heat exchange chambers, respectively. (2) The one heat exchange medium is a liquid that evaporates by heat exchange with hot water, which is the other heat exchange medium, and a mist separator is installed near the steam outlet in the partition chamber. 1 plate heat exchanger. (3) The one heat exchange medium is steam condensed by heat exchange with the other heat exchange medium, cooling water, and the partition chamber is further divided into an upper chamber and a lower chamber, and the condensate outlet side and 2. The plate heat exchanger according to claim 1, wherein a cooling coil is installed in the lower chamber.