JPS5922155B2 - rotary heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary heat exchanger in which a heat exchange section that exchanges heat between a primary fluid and a secondary fluid rotates.

Conventionally, high-temperature waste gases such as combustion gas, air, and waste steam discharged from factory equipment and furnaces are often simply discarded, which poses problems in terms of energy economy and thermal pollution.In order to prevent this, Heat exchangers are used to recover this waste heat and use it for other purposes, but since the heat transfer part inside the heat exchanger is fixed, there is a limit to the effective area for heat exchange, and the heat exchanger is It had the disadvantage of being large.

Further, in order to improve the contact between the heat exchanger tubes and the fluid, it is sufficient to move the heat exchanger tubes relatively actively, but the mechanism for moving the heat exchanger tubes must be complicated and large, which is impractical.

The present invention eliminates the above-mentioned drawbacks of the conventional heat pipe by rotating the other end of a heat pipe that exposes one end to the flow path of the secondary fluid in the flow path of the primary fluid. The object of the present invention is to provide a heat exchanger with a simple structure that has low efficiency, particularly a device that can effectively extract thermal energy in the form of latent heat from waste heat.

The present invention has a primary flow path for flowing a primary fluid and a second flow path for flowing a secondary fluid.
A heat pipe is provided, the heat pipe having a secondary flow path partitioned by a partition wall having no seal portion, and having opposite ends exposed to the primary flow path and the secondary flow path, respectively. is rotatably supported by a driving force, and supplies liquid to the outer surface of the heat pipe in the secondary flow path so that the secondary fluid contacts the heat pipe, evaporates, and takes heat from the primary fluid in the form of latent heat. This is a rotary heat exchanger characterized by being equipped with piping.

To explain the present invention with reference to the drawings, FIG. 1 shows a cross-sectional line of a steam generator that generates steam by heating a secondary fluid B using the heat of a primary fluid A such as high-temperature waste gas. 2, the primary fluid A is discharged through the primary flow path 17 in the casing 1 into a flow A'.

The liquid secondary fluid B is injected into the secondary flow path 17' in the casing 2 by the nozzle pipe 7, obtains heat from the primary fluid, evaporates, becomes a gas, and is discharged to B'.

A disk serving as a partition wall 23 is provided on the shaft 9 supported by bearings 10 and 10', and a plurality of heat pipes 5 are attached thereto.

One end 5' of this heat pipe 5 is exposed in the primary flow path 17, and the other end 5N is exposed in the secondary flow path 17'.

The primary flow path 17 and the secondary flow path 17' are separated by a partition wall 23 having no seal structure between them, and the outer periphery of the disk is sealed by a seal 6.

The shaft 9 is rotated by being driven by another drive device or by the primary fluid A as described below.

If high-temperature gas discharged from factory equipment or furnaces is passed through the primary flow path 17 as the primary fluid A, the end of the heat pipe 5 rotating around the shaft 9 within the primary flow path 17 5' and imparts heat to the heat pipe 5 and transfers it to the opposite end 5''.

A liquid secondary fluid B such as water is sprayed into the secondary flow path from the nozzle pipe 7, contacts the high temperature end 5'', generates steam, and is discharged to B'.

In this case, a heat pipe serving as a heat exchanger rotates with respect to the primary fluid A and the secondary fluid B, resulting in a fast contact speed, high heat transfer efficiency, and a large-capacity steam generation device with small equipment.

In this case, as shown in FIGS. 2 to 4, the casing 1 forms a fixed vortex chamber, and is provided with an inlet 15 into which heated exhaust air, etc., as the primary fluid A enters, and an outlet 14 for discharge.

A steam exhaust pipe 12 is fixed concentrically with this outlet 14 and has a steam outlet 16, and the shaft 9 is rotated by bearings 10, 10' supported therein by supports N1.11'. Possibly supported.

A casing 2 is integrally attached to the shaft 9.

Since the casing 2 is rotatable, a seal 6 such as a labyrinth or gland packing is provided between it and the casing 1, and a similar seal 13 is provided between it and the discharge pipe 12.

The quaternary flow path 17' inside the casing 2 is separated from the primary flow path 17 inside the casing 1 by a large partition wall 23 in the seal portion.

Heat pipes 5 are provided penetrating through the partition wall 23, and each heat pipe 5 forms a heat exchange section together with a large number of inner plate-like fins 4.The heat pipes 5 are divided into a plurality of groups. As shown in the figure and FIG. 4, for example, one group is formed of three heat pipes 5 and arranged in the shape of a turbine blade.

A ring-shaped nozzle pipe 7 is provided around the heat pipe 5 in the secondary flow path 17', and a liquid supply pipe 8 is connected thereto.

During operation, primary fluid A such as high-temperature gas is inlet 1.
The heat is discharged from the outlet 14 through the primary flow path 17, but during that time it passes between the heat pipes 50.

At this time, since the heat pipes 5 are arranged like turbine blades, they act as rotational driving blades, and the heat exchanger composed of the heat pipes 5 and fins 4 receives rotational force and is supported by the bearings 10 and 10'. The shaft 9 rotates together with the casing 2.

Therefore, the primary fluid A comes into sufficient contact with the heat exchanger and efficiently imparts heat to the end portion 5' of the heat pipe, and further heat is transferred to the end portion 5''.

On the other hand, the secondary fluid such as water injected from the nozzle pipe 7 via the liquid supply pipe 8 comes into contact with the end portion 5'' and the fins 4, is heated, evaporates, the pressure inside the casing 2 increases, and the steam is released into the exhaust pipe 12. The liquid is discharged from the outlet 16 and effectively utilized for various purposes.

In this embodiment, as the heat pipe 5 rotates in the primary flow path 17, the contact becomes sufficient and the heat transfer coefficient improves, and the heat pipe 5 rotates in the primary flow path 17 and the secondary flow path. 17
' are separated by a partition wall 23 that does not have a seal structure, and even if there is an accident where the fluid leaks through the seals 6 and 13 in both channels, the primary fluid A and the secondary fluid B will be Since they do not come into direct contact, there is no risk of them mixing with each other.

Furthermore, since the casing 2 can also rotate, unevaporated droplets are separated from the fins 4 and the heat pipe 5 by centrifugal force, and then collected at the maximum radius of the casing 2, where they can be easily collected.

Since this liquid has a high temperature, it may be used as a heating liquid for other purposes, or it may be pumped into the liquid supply pipe 8 again to be circulated and evaporated.

In this case, if a pump is directly connected to the shaft 9, the liquid can be sent to the liquid supply pipe 8 again without requiring any other power.

As described above, since the secondary fluid can be extracted from the liquid state as vapor, compared to the case where the secondary fluid enters and exits in the gaseous state, there is no need for a large-diameter inlet pipe, and the device can be made smaller. It is possible to rotate the secondary fluid casing as in the embodiment.

FIG. 5 shows another embodiment in which the seal 6 of the casing 1 is provided outside the seal 13 of the casing 2, and the seal area and relative speed are reduced so that the sealing effect is ensured.
Furthermore, even if leakage occurs from the seal, primary fluid A and secondary fluid B will not mix with each other.

The present invention has a primary flow path for flowing a primary fluid and a second flow path for flowing a secondary fluid.
The primary flow path and the secondary flow path are each provided with a heat pipe whose opposite ends are exposed, and the heat pipe is driven. Piping that supplies liquid to the outer surface of the heat pipe in the secondary flow path, the secondary fluid being rotatably supported by a force and so that the secondary fluid contacts the heat pipe and evaporates, taking heat from the primary fluid in the form of latent heat. This makes it possible to provide a small, large-capacity heat exchanger with a high heat transfer efficiency in the heat exchange part, a simple structure, and the ability to easily recover heat from high-temperature waste air in the form of latent heat. Moreover, since the secondary fluid is liquid (water) at the inlet and gaseous (steam) at the outlet, the seals for each fluid are very small and easy to make, and there is no mixing between them. Furthermore, steam can be used as a secondary fluid, so when recovering and using various kinds of waste heat that are common in factories, it has high utility value if it is in the form of steam, and it can also be used in the form of heat. It also has the advantage of being able to rotate a turbine, making piping smaller than a gas body, and piping parts being popular and easily available.

In other words, since the liquid is sprayed in a nozzle shape around the heat pipe's rotation and steam is generated, the steam can be taken out from the shaft via piping, and therefore, it enters and exits the secondary fluid side in the form of a gas. There is no need for a large spiral casing, and therefore the casing can be rotated in a way that cannot be done with a spiral casing.Furthermore, since the casing can be rotated, it can be rotated as a unit with the heat pipe. Moreover, since both flow paths are separated by a partition wall with a sealing part, it is possible to prevent mixing between the primary fluid and the secondary fluid, and sealing can be performed at low circumferential speeds, which reduces energy consumption in practical terms. This is extremely effective in terms of recovery.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view showing a schematic structure, FIG. 2 is a side view seen from the primary fluid outlet side, and FIG.
The figure is a side view seen from the outlet side partially showing the arrangement of the heat pipes inside the casing, Figure 4 is a side view seen from the outlet 16 side partially showing the arrangement of the heat pipes inside the casing, and Figure 5 is separate. FIG. 1.2...Casing, 4...Fin, 5...Heat pipe, 5', 5"...
・End part, 6, 13... Seal, 7...
Nozzle pipe, 8...liquid supply pipe, 9...shaft,
10,10I-...Bearing, 11,11'...
・Support, 12...Exhaust pipe, 14, 16...
...Exit, 15...Entrance, 17...
・Primary flow path, 17'...Secondary flow path, 23...
...Bulkhead.

Claims (1)

[Scope of Claims] 11 A primary flow path through which an 11th-order fluid flows and a secondary flow path through which a secondary fluid flows are separated by a partition wall having no sealing portion, the primary flow path and the secondary flow path. The heat pipes are rotatably supported by a driving force, and the secondary fluid contacts the heat pipes, evaporates, and transfers heat to the primary fluid in the form of latent heat. A rotary heat exchanger comprising piping that supplies a liquid to the outer surface of a heat pipe in a secondary flow path so as to take heat from the fluid. 2. The rotary heat exchanger according to claim 1, wherein the driving force for the heat pipe group is generated by the flow of fluid in the primary flow path. 3. According to claim 1, a large number of the heat pipes are provided, a plurality of groups are formed for each small number of heat pipes, and the heat pipes of each group are arranged in the shape of driving wings that rotate the heat pipe group. rotary heat exchanger. 4. Claim 1 or 2, wherein the liquid supplying pipe is a ring-shaped nozzle pipe provided around the heat pipe, and sprays a secondary fluid onto the heat pipe. Rotary type as described