JPS5828919B2 - direct heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direct heat exchanger, and more particularly to a direct heat exchanger suitable for preventing coalescence of vapor bubbles that often occur during heat exchange.

It is well known that there is a direct liquid-liquid heat exchanger that exchanges heat through direct contact between a heating medium and a medium to be heated to generate steam from the medium to be heated. That's right.

In this direct heat exchanger, there are countless steam bubbles in the heat medium on the heating side, so the steam bubbles coalesce into large bubbles, resulting in uneven density distribution inside the heat exchanger. This creates a vortex and the flow becomes non-uniform.

Therefore, if a low boiling point medium with the dissolution properties shown in Figure 1 is used as the medium to be heated that comes into contact with the flowing heat medium as described above, when the two exchange heat, localized A low-temperature region tends to occur, and in this low-temperature region, the melting of the slag progresses, the temperature decreases more, and the heat exchange performance deteriorates.

An object of the present invention is to provide a direct heat exchanger that can improve heat exchange performance by restricting the coalescence of vapor bubbles generated in the heating medium.

In order to achieve this object, the present invention provides a container having a heat medium inlet at the bottom, a heat medium outlet and a low boiling point medium vapor outlet at the top, and a low boiler installed on the side of the heat medium main port in the container. a boiling point medium ejecting means, the heat transfer medium supplied from the heat medium inlet and the low boiling point medium ejected from the ejection means perform heat exchange through direct contact to generate low boiling point medium vapor. The heat exchanger is characterized in that a partition wall forming a plurality of flow paths is provided between the low boiling point medium jetting means and the heat medium outlet.

Hereinafter, one embodiment of the direct heat exchanger of the present invention will be described based on FIG. 2.

In the figure, 1 is a heat exchanger container, and the container 1 is provided with a heat medium 2 on its bottom wall, an outlet 3 for the heat medium on the upper side wall, and a low boiling point medium vapor outlet 4 on the earthen wall.

Reference numeral 5 denotes a supply pipe for a low boiling point medium that passes through the lower side wall of the container 1 and faces into the container 1. A header 6 is connected to the tip of the supply pipe 5.

The header 6 is disposed approximately midway between the heat medium port 2 and the outlet 3, and has a plurality of ejection holes 7 on its upper surface.

A plurality of partition walls 8 are installed between the heat medium outlet 3 and the header 6 in the container 1, and a plurality of flow paths 9 are formed between each partition wall 8.

As the partition wall 8, for example, a cylindrical body 80 as shown in FIG. 3 is used.

A plurality of the cylindrical bodies 80 are arranged side by side in contact with each other as shown in the figure, and the inside 80a of each cylindrical body 80 and the cylindrical body 8 are
A space 80b formed between the 0 and 0 comrades is configured as a flow path 9.

Since the direct heat exchanger of the present invention has the above-described configuration, the heating side heat medium introduced into the container 1 from the heat medium population 2 passes through the header 6 and passes through each flow path formed by the partition wall 8. 9, where it exchanges heat with the low boiling point medium through direct contact and is discharged from the heat medium outlet 3.

On the other hand, the low boiling point medium on the side to be heated flows into the header 6 from the supply pipe 5, and is ejected from the ejection holes 7 of the header 6 toward each flow path 9.

The ejected low boiling point medium undergoes a phase change from liquid to gas by heat exchange with the heat medium, and becomes vapor bubbles 10.

This vapor bubble 10 rises while combining with other vapor bubbles in the flow path 9, and after leaving the liquid level, the low boiling point medium vapor outlet 4
more excreted.

Since the above-described coalescence of the vapor bubbles 10 takes place within the narrow channel 9, the range and size of the coalescence is limited.

As a result, the uneven distribution of bubbles in the heat medium is reduced and a uniform density distribution is achieved, thereby preventing the generation of local vortices and uneven flow, and improving heat exchange performance.

FIGS. 4 and 5 show other examples of the partition wall 8, and FIG.
0 is arranged as shown in FIG. 3, the cylindrical body is partially removed, and the space 80b is formed into a flow path 9.

Further, FIG. 5 shows a state in which a plurality of cylindrical bodies 80 are arranged in a staggered manner, with some of the cylindrical bodies removed, and the space 80b formed as a flow path 9.

By using the partition wall described above, the weight of the partition wall itself can be reduced.

Furthermore, the partition wall may be formed of a corrugated plate.

As explained above, according to the direct heat exchanger of the present invention, it is possible to improve heat exchange performance by preventing the non-uniform flow due to bubble coalescence and the adverse effects associated with the occurrence of a low temperature region.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between the dissolved amount of the low-boiling point medium used in the present invention and temperature, Fig. 2 is a sectional view showing an embodiment of the direct heat exchanger of the present invention, and Fig. 3 is a diagram showing the relationship between the dissolution amount of the low boiling point medium used in the present invention and the temperature. FIG. 4 and FIG. 5 are plan views showing other examples of the partition wall. 1... Container, 2... Heat medium inlet, 3... Heat medium outlet, 4... Low boiling point medium vapor outlet, 5... Low boiling point medium supply pipe, 6... Header, 7 ...Blowout hole, 8...
Partition wall, 9... Channel, 10... Steam bubble, 80゛...
- Cylindrical body, 80a... Inside of the cylinder, 80b... Space.

Claims (1)

[Scope of Claims] 1. A container provided with a heating medium inlet on the lower side and a heating medium outlet and a low-boiling point medium vapor outlet on the upper side, and low-boiling point medium jetting means installed on the heating medium inlet side of the container. The low boiling point medium has a property that its solubility in the heat medium increases as the heat medium temperature decreases, and the low boiling point medium has a property of increasing its solubility in the heat medium as the heat medium temperature decreases, and the low boiling point medium is supplied from the heat medium inlet and the low boiling point medium is ejected from the ejection means. In a direct heat exchanger that generates low boiling point medium vapor by performing heat exchange with a medium through direct contact, a partition forming a plurality of flow paths between the low boiling point medium jetting means and the heat medium outlet. A direct heat exchanger characterized by having a wall. 2. The direct heat exchanger according to claim 1, wherein the partition wall is formed of a plurality of cylindrical bodies.