JPH031593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heat exchange method and a heat exchanger thereof, which enable rapid cooling or heating of a fluid to be heat exchanged.

[Prior art]

BACKGROUND ART Conventionally, heat exchange has been an important operation in various industries, and various heat exchange methods have been adopted everywhere in industrial equipment, and many heat exchangers for performing heat exchange have been employed.

In these heat exchange methods and heat exchangers,
Increasing the heat transfer rate or heat transfer flow rate per unit area is also useful in order to reduce the impact of equipment costs on industrial equipment and heat exchangers on production costs, and in cases such as rapid exothermic reactions. This is also an important issue in terms of safety, in order to smoothly remove the reaction heat and prevent the reaction from running out of control.

In addition, when applying these conventional heat exchange methods to heating, the fluid contained in the laminar lower layer on the heat transfer surface exists closer to the heat transfer surface, and the heat transfer Because the residence time on the surface is long, the temperature is slightly higher than the average temperature of the main fluid stream, and the heating time is also longer, so the thermal decline and deterioration of the fluid quality in this area is greater than that of the main fluid stream, and on average, the overall temperature However, there is a problem in that the quality of the product slightly deteriorates and deteriorates, making it difficult to control accurately.

Conventionally, the purpose of increasing the heat transfer rate and heat transfer flux in heat exchange in these industrial devices and heat exchangers has been to increase the flow rate of the fluid to reduce the thickness of the laminar bottom layer, or to increase the thickness of the laminar bottom layer. It is common practice to increase the effective heat transfer area by providing fins or protrusions on the heat transfer surface, and methods have also been adopted in which the area near the heat transfer surface is stirred or the fluid on the heat transfer surface is scraped off. .

However, among these methods, when increasing the flow rate by increasing the pump capacity, a large proportion of the energy consumed for pump power is consumed in the pipes in the middle of the piping, increasing the heat transfer velocity and heat transfer flux. Therefore, the disadvantage was that the rate at which the energy was used was not necessarily large, and the objective could not always be achieved.

In addition, the method of providing fins or protrusions on the heat transfer surface tends to create shadows or flow stagnation areas between the fins or protrusions, and cannot effectively achieve its purpose, especially for fluids with relatively high viscosity. .

Furthermore, the method of stirring the vicinity of the heat transfer surface has the disadvantage that it is difficult to uniformly stir the vicinity of the heat transfer surface, so it is difficult to exert the effect on the entire heat transfer surface. In general, the effect of reducing the thickness of the laminar bottom layer was small.

In addition, although the method of scraping the fluid near the heat transfer surface has a great effect on reducing the thickness of the laminar bottom layer, it consumes relatively large amount of power and also causes relatively large wear on the scraping blade and the heat transfer surface. There was a problem that it was easy to break down.

[Purpose of the invention]

The present invention was made in order to eliminate the drawbacks of the conventional heat exchange technology, and uses a special rotating body to alternately generate a discharge swirl flow and a suction swirl flow on the heat transfer surface. The aim is to increase the heat transfer rate and heat transfer flux by making the thickness of the upper laminar bottom layer as thin as possible and by quickly transporting the heat transferred from the heat transfer surface to the fluid into the main fluid flow. This is the purpose.

[Summary of the invention]

In order to achieve the above object, the heat exchange method of the present invention has a function of alternately generating a discharge swirling flow and a suction swirling flow on the inner surface, the outer surface, or the inner and outer surfaces of a cylindrical heat transfer surface. The rotation of the rotating body with the central axis of the cylindrical heat transfer surface as the rotation axis causes the heat transfer to occur through the inner surface, outer surface, or inner and outer surfaces of the heat transfer surface. A heat exchanger to which this method is applied rapidly cools or heats the fluid to be heat exchanged. It is equipped with a plurality of rotating disks and guide vanes that have the function of alternately producing a discharge swirling flow and a suction swirling flow, and also has a built-in rotating body whose rotational axis is the central axis of the cylindrical heat transfer surface. , by providing means for rotating the rotating body.

[Embodiments of the invention]

Examples of the heat exchange method of the present invention and its heat exchanger will be described below based on the drawings, but FIG. 1 shows only the inside of the cylindrical heat transfer surface of the heat exchanger to which the heat exchange method of the present invention is applied. FIG. 2 is a longitudinal cross-sectional view of Example 1 having a rotating body, and FIG. 2 is a plan cross-sectional view taken along the line AA in FIG. 1.

This heat exchanger consists of a cylindrical body, and a cylindrical heat transfer surface 2 is formed in this cylindrical body, and a medium passage for passing the medium Y on the outer surface side of this heat transfer surface 2. 9 and 7 are provided, and fluid passages 8 and 6 are provided on the inner surface side of the heat transfer surface 2 for passing the fluid X to be heat exchanged.

Next, a rotating shaft 1 is provided at the central axis O-O of this cylindrical heat transfer surface 2, and this rotating shaft 1 has eight rotating disks 5 shown in FIG. A rotating body constituted by the rotating shaft 1, the rotating disk 5, and the guide vanes 3 is built into the inner surface of the heat transfer surface 2, and the rotating shaft 1 is adapted to be rotated in the direction of arrow R by a driving means such as a motor (not shown).

In the above-mentioned rotating body, portions with guide vanes 3 and portions without guide vanes are provided alternately between each rotating disk 5, so that by rotating the rotating body, the inner surface of the heat transfer surface 2 It has a function of alternately generating a discharge swirling flow and a suction swirling flow, so that the fluid X to be heat exchanged can be rapidly cooled or heated by the medium Y via the heat transfer surface 2. It's summery.

By rotating the rotating body of the heat exchanger of Example 1 having the above-described configuration in the direction of arrow R about the rotating shaft 1, a discharge swirl flow is generated in the inner surface of the heat transfer surface 2 at the portion where the guide vanes 3 are provided. On the contrary, a suction swirl flow is generated in the part without the guide vane 3, and the laminar flow bottom layer on the heat transfer surface 2 becomes extremely thin due to the discharge swirl flow, and the heat transfer surface 2 and the fluid Heat exchange is performed between
As it moves away from the vicinity of the fluid X, it mixes with the main flow of the fluid X.

The fluid X as a whole flows from the fluid pipe 8 to the fluid pipe 6, and experiences several discharge swirling flows and suction swirling flows due to the rotating body having the guide vanes 3 between inflow and outflow. , the medium Y flowing in from the medium line 9 via the heat transfer surface 2 and flowing out from the medium line 7
and performs heat exchange.

Of course, the number, diameter, spacing, rotation speed, etc. of these rotating disks 5 and guide vanes 3 can be appropriately selected according to the purpose of use and the physical properties of the fluid X.
Further, the heat transfer surface 2 may be a wall of a reactor in which a reaction is performed or a wall of another device.

Note that 12 in FIG. 1 is a seal on the rotating shaft 1.

In addition to the functions of Embodiment 1 in FIG. 1, FIG. 3 shows that the outer surface of the cylindrical heat transfer surface 2 is also
Embodiment 2 with a rotating body that rotates around O
The same parts as in Example 1 are indicated by the same part numbers, and Fig. 4 shows B in Fig. 3.
- It is a plane cross-sectional view of the B direction.

In Figures 3 and 4, the driving part that rotates the rotating body provided on the outer surface of the heat transfer surface 2 in the direction of the arrow R' is omitted in the drawings for simplicity, but It can be easily driven by the drive method.

The structure and function of the rotating body on the outer surface side of the heat transfer surface 2 shown in FIGS. By rotating this rotating body, a discharge swirl flow and a suction swirl flow can be generated on the outer surface of the heat transfer surface 2.

Of course, in these figures, the number, diameter, spacing, rotation speed, etc. of the rotating disk 5 and the guide vanes 3 can be appropriately selected according to the purpose of use and the physical properties of the fluid X and the medium Y.

Further, the position of the discharge swirling flow relative to the inner surface side of the heat transfer surface 2 and the position of the discharge swirl flow relative to the outer surface side may be shifted. The embodiment having the third
This can be obtained by removing the rotating body on the inner surface side of the heat transfer surface 2 in Example 2 shown in FIGS.

In addition, it is preferable that the rotating disk 5 shown in FIG. 5 has an arbitrary shape in the shape of the portion through which the fluid X flows vertically, and adopts one having small flow resistance upstream and downstream.

[Effects of the Invention] According to the heat exchanger of the present invention described above, the production cost of the rotating body is added to the production cost of the heat exchanger, but on the other hand, although it varies depending on the operating conditions, The heat transfer coefficient on the thermal surface is determined by the conventional method 2.
Since a value of ~3 times or more can be obtained, the required heat transfer area is reduced and the heat exchanger can be formed compactly.
Overall production costs will decrease.

In addition, compared to the conventional case where the pump capacity is increased to increase the flow velocity near the heat transfer surface to promote heat transfer, most of the energy is consumed in generating and circulating the suction flow, and the pressure in the middle of the piping increases. Since the proportion consumed by losses is small, there is an advantage that the effective utilization rate of the energy required for promoting heat transfer is high.

Furthermore, if the present invention is applied as a heat exchange method and heat exchanger in industrial equipment that requires rapid heating or cooling on the heat transfer surface, the temperature difference to be applied and the required heat exchange time can be minimized. In addition, more accurate control is possible, thermal deterioration of products can be minimized, and industrial equipment can be more accurately controlled thermally, leading to improved product quality.

Furthermore, the present invention has great economic and industrial benefits, as it can be directly applied to heat exchange in chemical equipment that requires heat exchange in addition to reaction and absorption.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a heat exchanger according to Embodiment 1 of the present invention having a rotating body for promoting heat transfer only on the inside, FIG. 2 is a plan sectional view taken along the line A-A in FIG. 1,
FIG. 3 is a longitudinal cross-sectional view of a heat exchanger according to a second embodiment of the present invention having rotating bodies for promoting heat transfer on the inside and outside, FIG. FIG. 5 is an example of a plan view of the rotating disk applied to the first and second embodiments. 1... Rotating shaft, 2... Heat transfer surface, 3... Guide vane, 5... Rotating disk, O-O... Central axis, R,
R'...rotation direction, X...fluid, Y...medium.

Claims (1)

[Claims] 1. A plurality of rotating disks and guide vanes capable of alternately generating a discharge swirling flow and a suction swirling flow on the inner surface, outer surface, or inner and outer surfaces of a cylindrical heat transfer surface. Rapid cooling or heating of a fluid that is heat exchanged via the inner or outer surface of the heat transfer surface, or between the inner and outer surfaces, by the rotation of a rotating body with the central axis of the cylindrical heat transfer surface as the rotation axis. A heat exchange method that performs 2 A cylindrical heat transfer surface comprising a plurality of rotating disks and guide vanes capable of alternately generating a discharge swirling flow and a suction swirling flow on the inner surface, outer surface, or inner and outer surfaces of a cylindrical heat transfer surface. A heat exchanger that includes a built-in rotating body whose rotational axis is the central axis of a heat transfer surface, and has means for rotating the rotating body.