JPS592839B2 - Rotary gas heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary gas heat exchanger using a heat pipe, and in particular, a rotatable inner cylinder is provided inside the outer cylinder, a heat receiving gas passage is provided inside the inner cylinder, and the outer cylinder and the inner cylinder are connected to each other. In a heat exchanger configured such that a heat supply gas passage is formed between the cylinders and the heat of the heat supply gas is transferred to the heat receiving gas by a heat pipe disposed through the inner cylinder, in the heat supply gas passage, Rotation that allows efficient heat exchange of gas by providing a plate or rod so as to intersect with the rotating surface of the heat pipe, or along the rotating surface and intersecting with the rotating direction of the heat pipe. The present invention provides a heat exchanger for type gas.

A heat pipe is a pipe with both ends closed and a layer of porous material (wick) provided on the inner surface, and the wick is impregnated with an appropriate amount of working fluid.One end is placed in high-temperature gas and the other end is placed in low-temperature gas. By placing the working fluid inside, the working fluid on the high-temperature gas side is heated and turns into steam, its vapor pressure increases, and it transfers to the low-temperature gas side and condenses.The heat of condensation heats the low-temperature gas and causes the condensation. The generated working fluid is returned to the high-temperature gas side by the capillary action of the wick, and has extremely high thermal conductivity compared to conventional methods based on mere heat conduction, so it is used for various purposes.

In addition, when these heat pipes are installed so that centrifugal force acts in the axial direction, or when they are installed at an angle, the working fluid moves by centrifugal force or gravity, and heat exchange is possible even without the wick. It can be used for any purpose.

The present applicants focused on this heat pipe, invented a rotary gas heat exchanger that effectively utilizes it, and filed a patent application.

(JP-A-54-28053, JP-A-53-119456
) Its outline is as illustrated in FIG.

That is, the outer cylinder 2 is formed in a sealed manner together with the top plate 3 and the bottom plate 4, and a rotary shaft 6 is rotatably supported at the center thereof.

The inner cylinder 5 is fixed to the rotating shaft 6 via support arms provided in a plurality of stages in the vertical direction, and a large number of heat pipes 9 are attached to the rotating shaft 6.

Further, the heat pipes 9 are attached to extend radially from the rotating shaft 6 side, and the radial heat pipes 9 are arranged in a plurality of rows in the vertical direction of the rotating shaft 6, and each pass through the inner cylinder 5 and pass through the outer cylinder. It protrudes from the inner side of 2.

On the other hand, the space formed between the outer cylinder 2 and the inner cylinder 5 is
A heat supply gas passage A is formed through which high-temperature gas passes, and inside the inner cylinder 5,
A heat-receiving gas passage B is formed through which low-temperature gas passes.

The rotating shaft 6 is actively rotated by the prime mover 7, and the inner cylinder 5 and the heat pipe 9 fixed to the rotating shaft 6 rotate together to evaporate the condensed working fluid sealed in the heat pipe 9. A centrifugal force is applied to the reflux.

Incidentally, particulate components in the gas adhering to the surface of the heat pipe 9 or the fins 11 are also scattered by the centrifugal force onto the inner circumferential surface of the outer cylinder 2, and descend along the circumferential surface, and are transferred to the through holes provided in the bottom plate 4. A receiver provided on the lower surface side of the bottom plate 4 (not shown) is guided into the vessel.

In the rotary gas heat exchanger configured in this way,
The high-temperature gas and the low-temperature gas passing through the heat-receiving gas passage B and the heat-supplying gas passage A, respectively, transfer heat extremely efficiently using the working fluid, which circulates smoothly in the heat pipe due to steam pressure and centrifugal force. Since the gas inside the heat-receiving gas passage B and the heat-supplying gas passage A is efficiently stirred by the heat pipe group, there is an advantage that the heat exchange efficiency is extremely high.

However, in this heat exchanger, if the heat pipe group is simply rotated, the circulating gas will rotate and flow together with the heat pipe group in the heat supply gas passage A, causing the heat pipes and the surrounding area to flow. Since the relative position with respect to the gas does not change, even if fins are provided, uniform contact with the entire gas becomes poor and heat transfer efficiency is reduced.

There are various means for improving the stirring effect of circulating gas.

If you stir too much, the heat-exchanged gas and unheat-exchanged gas will mix, which will actually reduce the heat exchange efficiency.
Considerable effort is required to improve heat transfer efficiency.

The present invention is a result of a struggle focused on this point.

That is, the present invention provides a rotating inner cylinder inside the outer cylinder of a heat exchanger, and attaches a large number of heat pipes radially from the rotating shaft so as to penetrate the rotating inner cylinder, and connects the outer cylinder and the rotating inner cylinder. In a gas heat exchanger in which a heat supply gas passage is formed between the rotating inner cylinder and a heat receiving gas passage is formed inside the rotating inner cylinder, a plate or rod is placed in the heat supply gas passage and intersects with the rotating surface of the heat pipe. The rotary gas heat exchanger is characterized in that the heat exchanger is disposed along the rotating surface, or is disposed along the rotating surface and intersecting the rotating direction of the heat pipe.

Note that in this application, a bar refers to an elongated body with approximately equal width and thickness, and a plate refers to an elongated body with a difference in width and thickness.

The invention will now be explained with reference to the examples of the drawings.

FIG. 2 is a longitudinal cross-sectional view showing an example of the heat exchanger of the present invention, and FIG. 3 is a cross-sectional view taken along the line X-X of the heat exchanger of FIG. This is an example of vertically provided near the inner circumferential wall of the outer cylinder.

A heat exchanger main body is formed in a sealed manner by the outer cylinder 2, top plate 3, and bottom plate 4, and a rotating shaft 6 is rotatably supported at the center thereof.

The inner cylinder 5 is fixed to the rotating shaft by support arms (not shown) provided in multiple stages in the vertical direction, and a large number of heat pipes 9 are arranged in multiple rows in the vertical direction of the rotating shaft 6. These heat pipes 9 are arranged radially, each passing through the inner cylinder 5, and a large number of fins 11 are provided on the surface thereof.

Further, a plurality of plates or rods 10a are attached to the inner peripheral surface of the outer cylinder 2 in the circumferential direction from the top plate 3 to the bottom plate 4 along the inner surface of the outer cylinder.

When the rotating shaft 6 is rotated by the prime mover, the inner cylinder 5 and the heat pipe 9 fixed to the rotating shaft 6 also rotate, and the heat supply gas passage (high-temperature gas Passage) The working fluid in the heat pipe 9 in contact with A is heated and evaporated, moves to the inner cylinder 5 side by the action of its vapor pressure, and flows through the heat receiving gas passage (low temperature gas passage) B in the inner cylinder 5. By transferring heat to the low temperature gas, the gas is cooled and condensed, and sent to the heat supply gas passage A again by the centrifugal force caused by the rotation of the heat pipe 9, and the same process as described above is repeated to perform heat exchange.

At this time, the plate or rod 10a prevents the surrounding gas from being carried along with the heat pipe 90 rotations, activates the flow of gas around the heat pipe 9, and causes the working fluid in the heat pipe 9 to interact with the gas. Make heat exchange more efficient.

In the case of this example, it is preferable to make the larger of the width and thickness of the plate more resistant to the flow of gas in order to prevent gas flow.

FIG. 4 is a longitudinal sectional view showing another example of the heat exchanger of the present invention, in which a plate or rod is placed along the rotating surface of the heat pipe.
This is an example in which the heat pipe is provided so as to intersect with the rotation direction of the heat pipe.

The structure and operation of the heat exchanger in FIG. 4 is exactly the same as in FIGS. 2 and 3, except for the rod or plate structure.

FIG. 5 is a perspective view showing an example of the plates or rods 10b mounted in rows on the inner peripheral surface of the outer cylinder 2 in the heat exchanger of FIG. 4.

In this example, a plurality of plates 13 are attached to the outer cylinder 2 of the heat exchanger in a vertical direction toward the rotating shaft 6, and slots 14 are bored to connect these plates 13. An annular plate 12 is integrally attached to the plate 13.

Also, instead of the annular plates 12 and 13 shown in FIG. 5, an annular plate 12' is provided with scale-like protrusions 15 as shown in the perspective view of FIG.
may be attached to the outer cylinder.

Of course, in this case, it is not necessary to provide the plate 13.

FIG. 7 is a perspective view showing still another example of plates or rods, in which a plurality of rods 10c are attached to an annular support 16, and this annular body 16 is attached to the inner circumference of the outer cylinder 2 of the heat exchanger. Heat exchange is performed while attached to a surface.

At this time, the rod 10c is attached so as to fit into the gap between the rows of heat pipes 9, and prevents the gas present near the heat pipes 9 from being carried away.

Generally, it is preferable to provide a notch or the like at the portion where the rod or plate contacts the outer cylinder so as not to impede the free fall of particulate components in the gas scattered on the inner surface of the outer cylinder.

Further, it is preferable that the plate or rod is provided with protrusions such as fins.

Since the heat exchanger of the present invention has the above-described structure, the circulating gas is less likely to be carried away by the rotation of the heat pipe.
Good contact between the circulating gas and the heat pipe enables efficient heat transfer.

Next, the present invention will be explained with reference to examples.

As shown in Figure 4, 54 heat pipes with a diameter of 25-1 and a length of 373 mm are divided into three stages, each with 18 heat pipes, and are arranged radially from around the rotating shaft to pass through the inner cylinder. Heat exchange experiments were conducted using a type heat exchanger.

The plate shown in FIG. 5 was used to prevent gas from being entrained (the annular plate 12 has a thickness of 3 m, a width of 100 mm, a height of the plate 13 of 5 m++, 8 pieces, and is made of aluminum).

150℃ high temperature gas 2ONy/min is passed through the heat supply gas passage, and at the same time 10℃ low temperature gas 2ONrr? / minute was passed through the heat receiving gas passage to perform heat exchange, and the result was 320
00K! The amount of heat exchanged per hour was obtained.

On the other hand, remove the annular plate 12 and plate 13 of this embodiment,
When the amount of heat exchanged was measured by circulating the same high temperature gas and low temperature gas as above, the amount of exchanged heat was only 20,000 K7/hour.

As can be seen from this experiment, the effects of the present invention are clear.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a rotary gas heat exchanger of a previously applied application, FIG. 2 is a vertical cross-sectional view showing an example of the rotary gas heat exchanger of the present invention, and FIG. FIG. 3 is a cross-sectional view taken along line X-X of the heat exchanger shown in the figure. FIG. 4 is a cross-sectional view showing another example of the rotary gas heat exchanger of the present invention. 5 and 7 are perspective views showing examples of plates or rods attached to the inner circumferential surface of the outer cylinder 2 of the heat exchanger shown in FIG. 4, and FIG. FIG. 6 is a perspective view of another embodiment of the plate; 1: Rotary gas heat exchanger, 2: Outer cylinder, 3: Top plate, 4:
Bottom plate, 5: Rotating inner cylinder, 6: Rotating shaft, 7: Prime mover, 9: Heat pipe, 10a, 10b. 10c: plate or rod, 11: fin, 12: annular plate, 13
: Board.

Claims (1)

[Claims] 1 In addition to providing a rotating inner cylinder inside the outer cylinder of the heat exchanger,
A large number of heat pipes are attached radially from the rotating shaft so as to pass through the rotating inner cylinder, a heat supply gas passage is formed between the outer cylinder and the rotating inner cylinder, and a heat receiving gas passage is formed inside the rotating inner cylinder. In the heat exchanger for gas, a plate or rod is provided in the heat supply gas passage so as to intersect with the rotating surface of the heat pipe, or along the rotating surface and intersecting with the rotating direction of the heat pipe. A rotary gas heat exchanger characterized by being provided as follows.