JPS6215657Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat exchanger that uses a heat pipe to transfer heat between high-temperature gas such as boiler combustion exhaust gas and low-temperature fluid such as air or water.

In this type of heat exchanger, multiple heat pipes are installed by penetrating a partition wall that separates a high-temperature gas flow path and a low-temperature fluid flow path, and heat transfer between the heat pipes and the high-temperature gas and low-temperature fluid is achieved. In order to increase the area, it is common to have a heat pipe with many fins, but when the high-temperature gas is combustion exhaust gas from a boiler or heat treatment furnace, the dust contained in the high-temperature gas is There was a problem that the heat transfer efficiency deteriorated as the heat pipe gradually adhered and accumulated on the fins of the heat pipe or the heat pipe itself.

In order to solve this problem, it is conceivable to use a disk as the partition wall and rotate the partition wall to apply a centrifugal force to the heat pipe, thereby causing the dust to separate from the fins or the heat pipe. However, in this method, the partition wall must be rotated at a fairly high speed, and the heat pipe moves through high-temperature gas and low-temperature fluid, so if the low-temperature fluid is a liquid such as water, The resistance force becomes extremely large, resulting in the inconvenience that the power device for rotating the partition wall must be large-sized. In addition, when the partition wall is rotated, its circumferential speed increases, making it difficult to seal between the partition wall and the casing. Furthermore, since some dust is lightweight and has a high viscosity, it is difficult to remove it from the fins or heat pipes using centrifugal force, and it is difficult to separate the dust from the fins or heat pipes by centrifugal force. If the rotation speed of the partition wall is slowed down in consideration of this, it becomes almost impossible to remove the dust.

In addition, conventional methods have been known in which liquid such as water is sprayed onto the heat pipe from a cleaning nozzle in order to remove dust attached to the heat pipe.
Even with this method, there are problems such as it is difficult to remove dust reliably, and it is difficult to treat waste liquid containing dust.Furthermore, if the liquid that adheres to or remains on the heat pipe dries during operation, the dust will be removed. The disadvantage was that it caused the heat pipe to adhere more firmly to the heat pipe.

This idea was made in view of the above circumstances, and is a heat exchanger that can reliably and easily remove dust attached to the fins of heat pipes, and thus maintain good heat exchange efficiency. The purpose is to provide a heat pipe, and its characteristics are that the heat pipe is rotatably attached to the partition wall, the fins of adjacent heat pipes are engaged so that they are in contact with each other, and the heat pipe is rotated. The fins are slid against each other to mechanically remove dust attached to the fins.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing one embodiment of this invention, in which a high-temperature gas circulation section 3 and a low-temperature fluid circulation section 4 are separated by a pair of partition walls 2 arranged parallel to each other in the casing 1. Each flow section 3, 4 has an inlet 5, 6 and an outlet 7, 8 formed therein. A large number of heat pipes 9 pass through the partition wall 2 so that one end protrudes into the high-temperature gas distribution section 3 and the other end projects into the low-temperature fluid distribution section 4. Each heat pipe 9 has its central axis line It is attached to the partition wall 2 via a sealing material 10 such as an O-ring so as to rotate around the center. The heat pipes 9 are arranged close to each other as a pair,
A large number of fins 11 are attached to each heat pipe 9 at regular intervals in the axial direction, and the fins 11 in the mutually adjacent heat pipes 9 forming a pair are as shown in FIGS. 2 and 3. They are interlocked in contact with each other.

Further, a gear 1 is provided in the intermediate portion of each heat pipe 9, that is, in a portion located in the space 12 between the partition walls 2.
3 are attached, and each gear 13 attached to a pair of heat pipes 9 is meshed with each other. Note that one gear 13 of the gears 13 attached to the heat pipes 9 that form a pair is meshed with a gear 14 disposed on the outer surface of the casing 1, so that each heat pipe 9 is connected to the outer surface of the casing 1. It can be rotated from the outside via gears 14 and 13.

Next, the operation of the above heat exchanger will be explained. Dust-containing high-temperature gas such as exhaust gas from a boiler is passed through the high-temperature gas distribution section 3, and the low-temperature fluid distribution section 4
When a low-temperature fluid such as water is caused to flow inside, the heat possessed by the high-temperature gas is carried to the low-temperature fluid side by the heat pipe 9, and as a result, heat exchange is performed between the high-temperature gas and the low-temperature fluid. If dust adheres to or accumulates on the fins 11 at the end of the heat pipe 9 on the high-temperature gas side as a result of continuous heat exchange in this way, if the gear 14 is rotated by a motor or manually, each As the heat pipe 9 rotates, the fins 11 that are in contact with each other rub against each other, so that adhering dust can be scraped off.

4A to 4D are partial detailed views showing other embodiments of this invention, and the configuration shown here is one in which the fins 11 of adjacent heat pipes 9 are brought into contact with each other via a dust scraper. It is.

That is, in the configuration shown in FIG. 4A, a sponge piece 15 is attached as a dust scraper to one of the fins 11 that engage with each other, and the heat pipe 9 is rotated to remove the other fin 1.
1 with a sponge piece 15 to remove dust, and in the configuration shown in FIG.
That is. Furthermore, the configuration shown in FIG. 4C is
A plate piece 17 having a substantially J-shaped cross section is attached as a dust scraper to the tip of one of the fins 11 arranged to mesh with each other, and the plate piece 17 is brought into contact with the surface of the other fin 11. It is designed to scrape off dust. Further, in the configuration shown in FIG. 4D, one of the fins 11 is formed into a corrugated plate shape, and its tip is brought into contact with the other fin 11, so that the corrugated fin 11
The tip of the dust scraper is used as a dust scraper.

Even with the configurations shown in FIGS. 4A to 4D, the first
Similar to the configuration shown in FIGS.
Dust attached to the can be reliably removed.

In addition, in the embodiment described above, the heat pipe 9
Connect the fins 11 on both ends of the heat pipe 9 to the other heat pipe 9.
However, since dust adhesion occurs on the dust-containing gas side, if the high-temperature gas or low-temperature fluid is a clean fluid that does not contain dust, the fins 11 on the clean fluid side should be There's no need to mesh. Moreover, the heat pipe 9 is
Although it may be rotated only when it is necessary to remove dust, if the heat pipe 9 is kept rotating at all times, the high temperature gas or low temperature fluid will be more actively stirred and flowing against the heat pipe 9. , the heat transfer coefficient between the two is improved, and therefore the dust can be removed continuously, and at the same time
Heat exchange efficiency can be improved.

As is clear from the above description, according to the heat exchanger of this invention, the fins of adjacent heat pipes are engaged with each other in contact with each other, and by rotating the heat pipes, the fins are moved relative to each other. Since the fins are configured to slide, the dust attached to the fins can be removed reliably and easily, and as a result, the heat exchange efficiency can be maintained at a good level at all times. Since this is carried out using pressure and relative sliding, the rotational speed of the heat pipe can be extremely low, and the drive mechanism can therefore be made simple. Unlike a heat exchanger, the dust removed from the fins does not contain liquid such as water, so it can be easily disposed of.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing one embodiment of this invention, Fig. 2 is an enlarged view of a part thereof, Fig. 3 is a view taken along the - line in Fig. 2, and Figs. 4 A to D are respectively this figure. FIG. 6 is a partial detail view showing another embodiment of the invention; 2... Partition wall, 3... High temperature gas distribution section, 4... Low temperature fluid circulation section, 9... Heat pipe, 11... Fin, 15... Sponge piece, 16... Brush, 1
7...Plate piece.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of heat pipes are arranged so that one end thereof protrudes toward the dust-containing high-temperature gas side and the other end protrudes toward the low-temperature fluid side. Each heat pipe is rotatably attached to a partition wall that partitions the fluid, and at least the end of each heat pipe on the dust-containing high temperature gas side is provided with a plurality of fins at regular intervals in the axial direction, and at least two fins adjacent to each other are provided.
A heat pipe type heat exchanger characterized in that a pair of heat pipes are interlocked so that the fins of each heat pipe are in contact with each other. (2) The heat pipe type heating device according to claim 1, wherein the fins that engage with each other are in contact with each other via a dust scraper attached to the surface of one of the fins. exchanger.