JPS5847638B2 - Plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to plate heat exchangers that primarily handle air-to-liquid condensation or evaporation.

Regarding this type of heat exchanger, the present applicant has proposed a horizontally placed cylindrical container having a gas supply port and a gas discharge port arranged on the top and bottom, and a pair of liquid introduction holes and a liquid discharge hole on the short side. In addition, a plate heat exchanger was previously proposed in which a group of plates were vertically arranged to form gas passages that opened as appropriate and closed liquid passages.

Its structure is as shown in FIGS. 1 and 2.

1 has a steam supply port 6 at the top and a steam discharge port I at the bottom,
A cylindrical casing placed horizontally, with steam passage forming plates 2a, 2a' and cooling passage forming plates 2b, 2.
A plate group 2 consisting of b' is vertically suspended via guide plates 3 and 4.

The plates 2a, 2a' and 2b, 2b' are alternately stacked.

The steam passage forming plates 2a, 2a' are provided with a gasket 5 as shown by the black line to connect the heat transfer surface and the cooling liquid introduction holes 8, 8.
' and the outlet holes 9, 9' are disconnected, and the steam introduction opening 1
0. 10' and lead-out openings 11, 11' are formed.

The cooling axillary passage structure plates 2b, 2b' are configured such that the heat transfer surface and the coolant introduction holes 8, 8' and 9, 9' communicate with each other.
A gasket 5 is arranged so as to surround both.

Since the plates 2a, 2a' and 2b, 2b' are arranged alternately as described above, the plate group 2 has steam passages A, A' which are appropriately opened to the inner space of the casing 1, and a sealed cooling liquid. Passages B and B' are constructed.

Steam is supplied from the supply port 6 of the casing 1 to the plates 2a, 2a.
'Introduction opening 10. The steam is distributed symmetrically and evenly to the casing 10', passes through the steam passages A and A' on the heat transfer surface, exits from the outlet opening 11. is discharged to.

On the other hand, the coolant rises through the coolant passages B and B' on the heat transfer surface from the coolant introduction holes 8 and 8', flows into the outlet holes 9 and 9', and is discharged to the outside of the casing.

Heat exchange between the steam and the cooling liquid takes place in the passages A, A', B, and B', the steam is cooled and condensed, and the condensate drain is discharged from the casing together with the treated steam.

This plate heat exchanger, which was previously proposed by the present applicant, is used in a range where the gas to liquid flow rate ratio per unit heat transfer area is several times to several tens of times higher than that of the liquid. It was developed to meet the needs of various cases.

However, even when dealing with the same condensation of air versus liquid, there are cases that are completely opposite to the previous application.

In other words, when the flow rate on the liquid side is excessive compared to the gas side, for example when dealing with steam condensation, the volume ratio of the cooling water volume to the steam volume must be several to several tens of times larger than the steam volume. There are often excessive cases.

Therefore, in the conventional concept of circulating cooling water through the sealed liquid passage side of the heat transfer plate, the yield of the heat transfer area in the heat transfer plate deteriorates and the heat transfer area cannot be secured. There is a fatal problem with the exchanger.

SUMMARY OF THE INVENTION The present invention seeks to provide an improved plate heat exchanger for exchanging heat between a large amount of liquid and a small amount of gas, which can overcome the above-mentioned problems.

For this purpose, the plate heat exchanger of the present invention includes a horizontally placed cylindrical container having a liquid supply port and a gas discharge port, a gas supply port and a gas discharge port, and a liquid passage formed between the two by polymerizing each other through a gasket. a plurality of plates disposed within the container that alternately form gas passages; each liquid passage has a liquid introduction opening and a liquid outlet opening having a large opening area located at an upper portion and a lower portion of the passage, respectively; The gas passage communicates with the interior space of the container through the container, and the gas passage is disconnected from the interior space of the container, and the gas introduction holes are formed in the upper and lower parts of the replate and communicate with the gas supply port and the gas discharge port of the container, respectively. and a gas outlet hole, and the gas outlet hole has a smaller opening area than the gas introduction hole.

According to one embodiment of the invention, the liquid introduction openings are located along both sides of the plate in the liquid passage, and the liquid outlet openings are located along the bottom side of the plate.

The limb introduction opening as well as the liquid outlet opening can be formed by the partial absence of the gasket.

Further, the opening area of the liquid introduction opening and the liquid outlet opening can be adjusted by adjusting the length of the gasket, which facilitates setting of the flow rate ratio of the heat exchange fluid and control of the pressure drop of the liquid.

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

As shown in FIGS. 3 to 5, in the present invention, the plate group 12 is arranged in a single row, and is suspended via guide plates 3, 3 to a casing 1, which is made up of a cylindrical container placed horizontally. has been done.

This plate group 12 is obtained by alternately stacking and tightening a plurality of steam passage construction plates N2a and coolant passage construction plates 12b.

The steam passage forming plate N2a has a steam introduction hole 13 having a large opening area at the upper part, and a steam drain discharge hole 14 at the lower part, and a gasket 15 is arranged around them so as to communicate them with the heat transfer surface, so that the plate N2a is sealed. A steam passage C is constructed.

In the coolant passage structure plate 12b, the steam introduction hole 13 at the upper part and the steam drain outlet 14 at the lower part are surrounded by a gasket 15 to cut off communication with the heat transfer surface, and the steam introduction hole 13 A cooling liquid introduction opening 16 is provided on the side of the casing 1 so that the upper space A of the casing 1 communicates with the heat transfer surface, and a cooling liquid introduction opening 16 is provided on the short side of the steam drain discharge hole 14 side so as to communicate the heat transfer surface with the lower space opening. A lead-out opening 17 is provided to constitute a coolant passage D.

18 is a coolant supply port of the casing 1, and 19 is a coolant discharge port.

The coolant flows from the supply hole 18 of the casing 1 to the upper space A, passes through the coolant introduction opening 16, flows down the coolant passage D on the plate heat transfer surface, and flows from the outlet opening 17 to the lower space opening and then through the discharge port 19. It is discharged outside the casing.

Then, the steam flows from the steam supply port 20 through the steam introduction hole 13 and down the steam passage C on the plate heat transfer surface, and as it flows there, it is cooled by the cooling liquid and condensed, and the condensed drain is filled with the treated steam. At the same time, it passes through the steam drain outlet hole 14 and is discharged from the steam exhaust hole 21 to the outside of the casing.

The plate heat exchanger of the present invention has the following features.

That is, compared to the conventional method in which coolant introduction holes 8, 8' and outlet holes 9, 9' with large opening areas are provided in the plate of a heat exchanger, the only hole with a large opening area is the steam introduction hole 13. Therefore, it is easy to secure the effective heat transfer area of the plate.

Furthermore, by changing the opening areas of the coolant inlet opening 16 and the outlet opening 17, the flow rate ratio of the coolant to steam can be easily set.

Moreover, the opening area of the coolant passage constituting plate t-12b can be easily increased or decreased by changing the length of the gasket 15 at any time, making it possible to set the desired flow rate, and especially for large-volume processing, the pressure of the coolant can be adjusted. Loss can be effectively reduced.

Further, the flow direction of the cooling liquid is from the upper part of the plate to the lower part, and since the cooling liquid does not flow against the gravity of the plate, it is possible to further reduce pressure loss.

Furthermore, the steam passage structure plate 1-1 2b extends over almost the entire width of the steam introduction hole 13 and the heat transfer surface when viewed from above, and there are no changes in expansion or contraction in the steam path until the steam is condensed. Therefore, the pressure loss within the plate is suppressed to the minimum limit, and the condensation efficiency can be improved.

Incidentally, the plate heat exchanger of the present invention can be applied not only to the above-mentioned condenser but also to an evaporator and a heat exchanger.

As explained below, the plate heat exchanger of the present invention has the following features:
A large amount of liquid is supplied to a large-volume container space, and a small amount of gas is passed through a small-volume gas passage between plates, but in consideration of changes in the state of the gas, the gas outlet hole is set closer to the gas inlet hole. Due to its small size, the effective heat transfer area of the plate has been expanded accordingly, while the liquid inlet and liquid outlet openings have large opening areas, improving heat exchange efficiency and reducing pressure loss of the heat exchange fluid. It has many effects such as reducing the

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing a plate heat exchanger previously filed by the present applicant, with Figure 1 being a longitudinal sectional view through its gas passage, and Figure 2 being a longitudinal sectional view through its liquid passage. , 3 and 4 are views showing a plate heat exchanger according to the present invention, in which FIG. 3 is a longitudinal sectional view passing through the gas passage, FIG. 4 is a longitudinal sectional view passing through the liquid passage, and FIG. 5 is a longitudinal sectional view passing through the liquid passage. The figure is a partial sectional view taken along the line I--I in FIG. 4. 18...Liquid supply port, 19...Liquid discharge port, 1...Casing, 13...
・Gas introduction hole, 14... Gas outlet hole, D...
...Liquid passage, C...Gas passage, 12...
... Plate group, 20 ... Gas inlet, 21
・・・・・・Gas exhaust hole.

Claims (1)

[Scope of Claims] 1. A plate heat exchanger for exchanging heat between a large amount of liquid and a small amount of gas, comprising a liquid supply port and a discharge port, and a gas supply port and discharge port. a horizontally placed cylindrical container with The gas passage communicates with the interior space of the container through a liquid inlet opening and a liquid outlet opening having a large opening area located at the upper and lower parts of the passage, and the gas passage is disconnected from the interior space of the container and is connected to the upper and lower parts of the plate. A plate-type plate type having a gas introduction hole and a gas outlet hole, each of which communicates with a gas supply port and a gas outlet of the container, and wherein the gas outlet hole has a smaller opening area than the gas introduction hole. Heat exchanger. 2. The plate-type heat exchanger according to claim 1, wherein the liquid introduction opening is located along both sides of the plate at the upper part of the liquid passage, and the liquid outlet opening is located along the bottom side of the plate. exchanger. 3. The liquid introduction opening and the liquid outlet opening are formed by the partial absence of the gasket, and the opening area can be adjusted by adjusting the length of the gasket. 1 plate heat exchanger.