JPS6042873B2 - Cylindrical heat pipe heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical heat pipe heat exchanger with improved heat exchange efficiency.

Conventionally, a heat pipe type gas-to-gas heat exchanger that recovers heat from waste gas to heat low-temperature gas has a rectangular parallelepiped-shaped casing with a partition plate to isolate the inside, and a plurality of heat There is one in which a heat exchange part is formed by inserting a pipe, the upper part of which is a heat radiating part through which low-temperature gas flows, and the lower part is a heat absorbing part through which high-temperature gas flows.

However, in such a heat exchanger, there is a limit in the thickness direction due to the large gas flow resistance.Therefore, in order to obtain a large amount of heat exchange, it must be expanded in the width direction. There was a drawback that the fruiting device was shaped like a flat plate, making it impossible to supply gas uniformly.

For this reason, the inventors of the present invention constructed a casing in which an annular partition plate was provided horizontally inside the peripheral wall surface of a hollow cylindrical body with a spiral peripheral wall surface and an open end surface of the vortex to form ducts above and below. A cylindrical heat exchange section in which multiple heat pipes are inserted in an annular manner in the vertical direction of a polygonal or disk-shaped partition plate is installed, and a heat dissipation section through which the low-temperature gas to be heated flows through the upper part. We developed and previously proposed a cylindrical heat-vib heat exchanger with the lower part serving as a heat-absorbing section through which high-temperature gas flows.

However, while this heat exchanger can be made smaller,
Since this cylindrical heat exchanger is installed inside a spiral casing, the gas that flows outward after completing heat exchange from the center of the heat exchanger on the heat radiation side is almost the same as the gas rotating inside the duct. Because they collide at right angles, turbulence occurs within the duct, increasing pressure loss and reducing heat exchange efficiency.

The present invention has been made based on various studies in view of the above points, and as a result, the present inventors have previously proposed a cylindrical heat-vib heat exchanger in which a cylindrical heat exchange section is installed in a spiral casing.
A cylindrical heat-vib heat exchanger in which a plurality of wind direction guide plates are provided on the outer circumferential surface of the cylindrical heat exchanger on the side of the heat radiation part to suppress generation of turbulence by providing a plurality of wind direction guide plates inclined along the opening end direction of the vortex. The device was developed. The present invention will be described below with reference to embodiments shown in the drawings.

1 to 3 show one embodiment of the present invention.

In the figure, 1 is a heat exchange part formed in a polygonal cylinder shape, 2 is a casing that houses this heat exchange part 1, 3 is a heat radiation part through which low-temperature gas to be heated flows, and 4 is provided below this heat radiation part 3. The heat absorbing portions through which the high-temperature gas flows are shown. The heat exchange section 1 has 12 heat exchange section units 61,
62,...61.

It is formed into a polygonal tube shape divided into a plurality of blocks arranged in an annular manner. As shown in FIG. 3, this heat exchanger unit 6 includes rectangular side plates 7, 7, a top plate 8, and a bottom plate 9.
, and is assembled into a frame shape with openings at the front and back by a partition plate 10, and a plurality of heat vibrators 12 having fins 11 provided in the partition plate 10 are inserted at equal intervals to form a rectangular tube-shaped vibe group 13.
, and a plurality of wind direction guide plates 14 are provided between the upper plate 8 and the partition plate 10 on the side of the heat dissipation part 3 so as to be perpendicular thereto and inclined with respect to the side plate 7. It is. As shown in FIG. 1, the heat exchanger units 61, 62, . The side plate 7 is arranged as a partition wall 16 arranged radially, and each block divided by the partition wall 16 has a prismatic vibrator group 13... to form a polygonal cylindrical heat exchange section 1. was formed.

The casing 2 that houses the heat exchanger 1 is a hollow cylindrical body 2a with a spiral peripheral wall surface and an open end surface of the vortex.
An annular partition plate 2b is provided horizontally at the center of the inner path of the peripheral wall surface, and ducts 17, 17 are formed above and below.

Furthermore, the end surface of the spiral-shaped casing 2 where the vortex is open is separated by a partition plate 2b, and the upper part serves as an exhaust port 2c through which low-temperature gas such as air is heated and discharged, and the lower part serves as an exhaust port 2c for high-temperature gas such as waste gas. The intake port 2d takes in the air.
Further, on the upper surface of the casing 2, there is an intake port 2e for taking in low-temperature gas that communicates with the hollow part 1a of the heat exchange section 1, and on the lower surface, the high-temperature gas taken in from the intake port 2d provided at the end surface of the vortex is used for heat exchange. After performing this, an exhaust port 2f is formed for exhausting the gas to the outside through the hollow portion 1b. To explain the operation of the cylindrical heat-vib heat exchanger having the above configuration, low-temperature gas is taken into the heat radiating part 3 from the intake port 2e formed on the upper surface of the casing 2, and the casing 2
High-temperature gas is introduced into the heat absorbing section 4 through an intake port 2d formed at the lower end face of the heat absorbing section 4.

The high-temperature gas blown in at this time travels inside the duct 17 while rotating in a spiral along the peripheral wall surface, and from each part partitioned by the partition wall 16 a group of heat vibrators 13 arranged in a prismatic shape are formed.
After being cooled by heat exchange, it reaches the center of the heat exchange section 1, and is then discharged to the outside from the exhaust port 2f provided on the lower surface of the casing 2.On the other hand, the heat vibrator 12 The working fluid is sealed in a metal tube sealed under reduced pressure, and the heat absorbed through heat exchange with high-temperature gas is rapidly transferred to the heat radiating section 3.Here, it exchanges heat with the low-temperature gas taken in from the intake port 2e. and heat it up.

In this case, the low-temperature gas flowing into the center of the heat exchange section 1 from the intake port 2e provided on the upper surface of the casing 2 is distributed uniformly to each block partitioned by partition walls 16 provided radially, similar to the heat absorption section 4. flows in and performs heat exchange. The gas heated through this heat exchange is blown out into the duct 17 by the wind guide plate 14 toward the open end of the vortex. The gas blown out obliquely by the wind direction guide plate 14 in this way is
Since it is in the same direction as the gas rotating in the duct 17 toward the open end of the vortex, generation of turbulent flow is suppressed, pressure loss due to turbulent flow is reduced, and heat exchange efficiency can be improved. Furthermore, as shown in FIG. 3, a prefabricated heat exchanger 1 in which a heat exchange unit 6 is formed in advance and assembled into a polygonal cylinder shape is extremely easy to assemble, and is particularly useful when the amount of heat exchange is large. The device can be made smaller.

In this case, the heat exchange section 1 is not limited to the P-gon shape, and can be arbitrarily selected.

Further, although the heat exchanger unit 6 is shown as being arranged through the spacer 5, it may be connected through a connector without providing the spacer 5. Moreover, the wind direction guide plate 14 is not limited to a fixed type, but can be rotatably attached to the heat exchange unit 61, . . . via a shaft 18, as shown in FIG. They may be connected to each other by a connecting rod 19 so that the inclination angle can be adjusted. FIG. 5 shows another embodiment of the present invention in which the partition wall 16 is not provided, in which a plurality of heat vibrators 12 are inserted annularly through the disk-shaped partition plate 15 to generate cylindrical heat. A plurality of wind direction guide plates 14, which are inclined along the opening end direction of the vortex, are provided on the circumferential surface of the heat radiation part 3 that forms the exchange part 1 and through which the low-temperature gas of the heat exchange part 1 flows. This is a cylindrical heat-vibe heat exchanger.

Next, specific examples of the present invention will be described.

Outer diameter 2 using copper as the inner tube and carbon steel as the outer tube
5.4? A heat vibrator 12 in which fins 11 made of carbon steel and having an outer diameter of 52.4Tr0nφ are attached to the outside of a double tube with a diameter of 380mm and a total length of 380mm, with a fin pitch of 3.5, and diphenyl-based heat transfer oil is sealed inside as a working fluid. was manufactured.

As shown in FIG. 3, 288 heat vibrators 12 are inserted into the partition plate 10 in 24 stages x 12 rows, and the heat exchanger unit 6
Assemble this and attach a thickness of 2.5Tf$L to the upper part (heat radiation part side).
1Width 150Tf$L1Length 140'' Wind direction guide plate 14
... was installed at a 40 degree angle. Twelve heat exchange unit units 61, 6 were assembled in this manner.

...Rl. As shown in FIG.
A cylindrical heat vibrator heat exchanger was assembled by mounting this inside the spiral casing 2. When the heat exchanger assembled as above was used to exchange heat between high temperature gas and low temperature gas under the conditions shown in Table 1 below, the amount of heat exchanged was 9.6 x 1σKc.
It was al/h.

In addition, for comparison with the present invention, the wind direction guide plate 14...
The heat exchange amount of the cylindrical heat vib heat exchanger without the
al/h, which was improved by about 70% in the present invention, and the pressure loss was also reduced by about 30%. As explained above, according to the cylindrical heat-vib heat exchanger according to the present invention, the pressure loss is reduced by minimizing the turbulent flow generated in the duct on the heat radiation part side, and as a result, the heat exchange efficiency is reduced. In addition to being able to improve
This has remarkable effects such as making it possible to downsize air blowers and ducts.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view of the cylindrical heat-vib heat exchanger of the present invention, Fig. 2 is a cross-sectional view taken along line 1 and 2 of Fig. 1, and Fig. 3 is shown in Fig. 1. A perspective view of the heat exchange section unit that constitutes the heat exchange section, Fig. 4 is a plan view showing the main parts of the heat exchange section with a wind direction guide plate rotatably attached, and Fig. 5 is a heat exchange unit without partition walls. FIG. 2 is a partially cutaway plan view of a cylindrical heat vib heat exchanger with a heat exchanger attached thereto. 1... Heat exchange section, 2... Casing,
2a...Hollow cylindrical body, 2b...Partition plate, 2c...
...Exhaust port, 2d...Intake port, 2e...
...Intake port, 2f...Exhaust port, 3...
... Heat radiation part, 4 ... Heat absorption part, 5 ... Spacer, 6, 61, 62 ... 612 ... Heat exchange unit, 10 ... Partition plate, 12...
・・Heat vibe, 13・・・・Vibe group, 14・
... Wind direction guide plate, 15 ... Partition plate, 16
...Bulkhead, 17...Duct, 19...
...Connecting rod.

Claims (1)

[Scope of Claims] 1. Inside a casing of a hollow cylindrical body whose peripheral wall surface has a spiral shape and whose vortex end surface is open, and in which an annular partition plate is provided horizontally inside the peripheral wall surface to form a duct above and below. A cylindrical heat exchange section in which multiple heat pipes are inserted annularly in the vertical direction of a polygonal or circular partition plate is installed, and the upper part serves as a heat dissipation section through which the low-temperature gas to be heated flows. , in a cylindrical heat pipe heat exchanger having a heat absorption section in which high-temperature gas flows at the bottom thereof, a plurality of wind direction guides are provided on the outer circumferential surface of the cylindrical heat exchange section on the side of the heat dissipation section and are inclined along the opening end direction of the vortex. A cylindrical heat pipe heat exchanger that is equipped with a plate to suppress the occurrence of turbulence. 2. On both the upper and lower sides of the peripheral part of the partition plate that constitutes the heat exchange section,
2. The cylindrical heat pipe heat exchanger according to claim 1, wherein a plurality of partition walls are provided radially perpendicularly thereto to divide the heat exchange section into a plurality of blocks. 3. The cylindrical heat pipe heat exchanger according to claim 2, wherein each block of the heat exchange section divided into a plurality of blocks is unitized to form a prefabricated structure.