JPH10314829A - Heat transfer tube for high temperature heat pipe and method for manufacturing the tube - Google Patents

Abstract

[PROBLEMS] To provide a heat transfer tube for a high-temperature heat pipe and a method for manufacturing the heat transfer tube, which can ensure a sufficient thickness not to burst under a high temperature and a high pressure and have high performance. The inner grooved tube and an outer grooved tube provided on the outer periphery of the inner grooved tube are provided. The sum of the wall thicknesses of the inner grooved tube and the outer grooved tube is high temperature and high pressure. The wall thickness to withstand was secured, and the inner and outer grooves provided for high performance. The manufacturing method is to cover the outer circumference of the inner grooved pipe with an inner and outer smooth smooth pipe, evacuate the smooth pipe with a die, laminate the smooth pipe on the inner grooved pipe, and then integrate the outer circumference of the smooth pipe. The surface is grooved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technology of heat transfer tubes for heat pipes, and more specifically, to one end of the tube in the axial direction which is exposed to high-temperature heat and the other end to high-temperature and high-pressure steam. The present invention relates to a heat transfer tube for a high-temperature heat pipe inserted into a generation chamber.

[0002]

2. Description of the Related Art A heat pipe is used in an exhaust heat recovery type heat exchanger as shown in FIG. 3 because it is a heat transfer element for effectively transferring a large amount of heat. That is, in the heat pipe 1, one end of the tube shaft is located at a portion through which high-temperature exhaust heat 2 generated from an industrial furnace, a gas turbine engine, or the like passes, and the other end of the tube shaft is inserted into the high-temperature and high-pressure steam generation chamber 3. Used as

[0003] The heat pipe 1 used as described above absorbs heat from the high-temperature exhaust heat 2, moves the absorbed heat into the steam generation chamber 3 and radiates heat, thereby converting the high-temperature and high-pressure steam 4. Will be generated.

[0004] As a heat pipe for a heat pipe used in the high temperature heat pipe type heat exchanger as described above, a conventional heat pipe has been used.
In addition to a so-called smooth tube having a smooth inner and outer surface, an inner grooved tube provided with an inner groove process has been used.

[0005]

There is a demand for high performance and small size of the above-mentioned high temperature heat pipe type heat exchanger, and for that purpose, the performance of the heat pipe which is a main element of the heat exchanger is improved. Is essential.

In order to improve the performance of the heat pipe, an effective heat transfer surface, that is, a groove must be formed on the inner and outer surfaces of the heat pipe for a heat pipe. In a heat pipe, it is necessary to increase the wall thickness of the pipe so as not to burst under high temperature and pressure.

However, the above-mentioned inner grooved pipe and the like
It is difficult to increase the wall thickness of the tube from the processing, and when performing cutting to form an effective heat transfer surface on the outer surface of the tube,
There is a problem that it is very difficult to secure a wall thickness enough to withstand high temperature and high pressure in the tube itself.

Therefore, the problems to be solved by the present invention (objects)
An object of the present invention is to provide a heat transfer tube for a high-temperature heat pipe, which can secure a wall thickness that does not burst under high temperature and high pressure and has high performance. Another object of the present invention is to provide a manufacturing method capable of easily manufacturing the high-temperature heat pipe heat transfer tube.

[0009]

A heat transfer tube for a high-temperature heat pipe provided by the present invention comprises an inner grooved tube and an outer grooved tube provided on the outer periphery of the inner grooved tube.
The sum of the thicknesses of the inner grooved tube and the outer grooved tube ensures a wall thickness that can withstand high temperature and pressure, and the inner and outer grooves provide high performance.

The method for manufacturing a heat transfer tube for a high-temperature heat pipe provided by the present invention is characterized in that a smooth tube having a smooth inner and outer surface is put on the outer periphery of the inner grooved tube, and the smooth tube is drawn from above the smooth tube with a die. The pipe is laminated and integrated on the inner grooved pipe, and then the outer circumferential surface of the smooth pipe is grooved, thereby easily producing a high-performance heat transfer pipe having a wall thickness capable of withstanding high temperature and high pressure. Consist of methods.

[0011]

FIG. 1 shows an embodiment of a heat transfer tube for a high-temperature heat pipe according to the present invention, wherein (a) 5 shows an inner grooved tube, and (b) 6 shows an outer grooved tube. 2 shows a smoothing tube for forming. That is, the smooth tube 6 is formed by covering the outer periphery of the inner grooved tube 5, laminating and integrating the inner surface with the inner grooved tube 5 by a manufacturing method described later, and then performing groove processing on the outer surface.

FIG. 2 shows an embodiment of a method of manufacturing a heat transfer tube for a high-temperature heat pipe according to the present invention. First, as shown in the uppermost figure, a smooth tube 6 is put on an inner grooved tube 5, By vacuuming the smooth tube with a die, as shown in the center figure, a smooth tube 6 'having a reduced diameter is laminated and integrated on the inner grooved tube 5 to form a thick wall tube.

Next, as shown in the lowermost part of FIG. 2, the outer peripheral surface of the smooth tube 6 'is subjected to a grooved process by cutting.
An inner and outer grooved tube 7 having a sufficient thickness to withstand high temperature and high pressure is formed.

The inner and outer grooved pipe 7 manufactured as described above
Is used as a heat transfer tube of the high temperature heat pipe 1 in the high temperature heat pipe type heat exchanger as shown in FIG. That is, one end of the high-temperature heat pipe heat transfer tube 7 is placed in a region through which exhaust heat passes, and the other end of the tube is inserted into the generation chamber. The heat transfer tube that has absorbed the heat from the exhaust heat evaporates the working fluid filled therein, and moves the working fluid toward the generation chamber on the opposite side. In the generation chamber, the water receives heat energy supplied from the outer surface of the heat pipe to generate high-temperature and high-pressure steam. At this time, the working fluid in the pipe is condensed in accordance with the transfer of the heat, returns to the original high-temperature exhaust heat passage side, and is heated again to evaporate.

In the process of generating high-temperature and high-pressure steam, high-temperature and high-pressure are applied to the heat transfer tube 7 itself. However, as described above, the wall thickness due to the integrated lamination of the inner surface grooved tube 5 and the smooth tube 6 is reduced. By being sufficiently secured, it is possible to prevent rupture even when exposed to the high temperature and high pressure.

Further, since the finished product is provided with grooves on both the inside and outside, it can function as a high-performance heat pipe.

The smooth pipe to be put on the inner grooved pipe may be made of the same material as the inner grooved pipe, but by changing the material of the smooth pipe to a corrosion resistant one, a heat pipe having good corrosion resistance can be manufactured. Is also possible.

[0018]

According to the present invention as described above, it is possible to provide a heat transfer tube for a high-temperature heat pipe, which can secure a sufficient thickness to prevent rupture under high temperature and high pressure and has high performance. The intended problem (object) of providing a manufacturing method capable of easily manufacturing a high-temperature heat pipe heat transfer tube can be achieved.

Further, in a high-temperature heat pipe type heat exchanger having a high temperature and a high pressure, conventionally, only a specific heat transfer tube can be used, but according to the present invention, various types of heat transfer tubes can be used. It is possible to manufacture a heat transfer tube having a heat transfer surface suitable for the application, thereby improving the performance of the heat pipe type heat exchanger and reducing the size of the heat exchanger. I do.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a heat transfer tube for a high-temperature heat pipe according to the present invention, in which (a) is a cross-sectional view of an inner grooved tube, and (b) is a crossing of a smooth tube for forming an outer grooved tube. Area view.

FIG. 2 is a cross-sectional explanatory view showing an embodiment of a method for manufacturing a heat transfer tube for a high-temperature heat pipe according to the present invention.

FIG. 3 is an explanatory diagram of a high-temperature heat pipe type heat exchanger.

[Explanation of symbols]

 Reference Signs List 5 Inner grooved tube 6 Smooth tube 6 'Smooth tube with reduced diameter 7 Heat transfer tube for high temperature heat pipe

Claims (2)

[Claims] 1. An end in the axial direction of a tube is exposed to high-temperature heat,
In the heat transfer tube for a high-temperature heat pipe, the other end of which is inserted into a high-temperature and high-pressure steam generation chamber, the heat transfer tube includes an inner grooved tube and an outer grooved tube provided on the outer periphery of the inner grooved tube. Heat transfer tube for high temperature heat pipe. 2. An inner and outer grooved tube is covered with a smooth inner and outer surface on the outer periphery of the inner surface grooved tube, and the smoothed tube is evacuated with a die to laminate and integrate the smoothed tube on the inner surface grooved tube. A method for manufacturing a heat transfer tube for a high-temperature heat pipe, in which an outer peripheral surface of a smooth tube is grooved.