JPS62272092A - Waste heat recovery device - Google Patents

Abstract

PURPOSE:To prevent the accident of breakage by a method wherein the title device is constituted by combining a sealing member provided with a thin part, which moves by the internal pressure of a heat pipe, at the end of the heat pipe, and a rapture assisting member provided with a pointed edge, opposed to the outer surface of the thin part and fixed at the end of the heat pipe. CONSTITUTION:A sealing member 14, which seals the end of a heat pipe 5, is provided with a thin part 14a, movable and rapturable by the internal pressure of the heat pipe 5, while the end of the heat pipe 5 and the sealing member 14 are connected by welding 15. A rapture assisting member 16, provided at the back surface of the thin part 14a, is connected to the sealing member 14 by welding 17. Further, a knife 16a, fixed to the end of the heat pipe 5 and capable of rapturing the thin part 14a, and a communicating hole 16b, which releases the internal pressure of the heat pipe 5, are provided in the title device. When the internal pressure rises abnormally, the thin part 14a is raptured by the internal pressure through the knife 16a, whereby the internal pressure may be released to atmosphere through the communicating hole 16b. Accordingly, the accident of breakage of the heat pipe itself may be prevented.

Description

Detailed Description of the Invention Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a waste heat recovery device for recovering sensible heat from, for example, a high-temperature slab, and particularly relates to a heat pipe used in this waste heat recovery device. Breaking! 1. This relates to safety measures to prevent accidents.

[Conventional technology]

For example, in a steel mill, it takes 1.000 to melt a rectangular ingot (hereinafter referred to as a slab) to roll it.
Blast furnace slag (hereinafter referred to as "slab") generates waste heat of over °C or emitted from various smelting furnaces, and is huge in both quantity and heat. In order to effectively utilize this waste heat at each steelworks,
A total of 100 waste heat boilers and heat pipe type waste heat recovery equipment have been installed.

Conventionally, as shown in FIGS. 1 and 2, this type of waste heat recovery equipment 1 generates radiant heat 4 while being transported by a heat source 3 such as equipment slag, which is composed of rollers, walking beams, etc. As shown in FIG. 2, the heat absorbing section 5a of the heat pipe 5 was disposed close to the moving heat source 3, and the heat dissipating section 5b of the heat pipe 5 was disposed within the drum 7 containing the heated liquid 6.

Therefore, the sensible heat possessed by the heat g3 is converted into radiant heat 4 by the heat absorbing portion 5a of the heat pipe 5. Alternatively, the heat can be recovered by the heat absorption part 5a of the heat pipe 5 via the fins 8, and the heat pipe 5 can be
Heat transport from the heat absorbing section 5a to the heat dissipating section 5b is performed by repeating evaporation and condensation of the heat medium 9 within the heat pipe 5.

Then, in the drum 7, the heated liquid 6 that has received heat from the heat radiation part 5b of the heat pipe 5 is heated and transferred to the drum 7.
The generated steam becomes lO, and the heat is recovered as steam 12 from the steam pipe 11, and the waste heat is effectively used.

[Problem that the invention seeks to solve]

However, if the supply of the heated liquid 6 into the drum 7 in the waste heat recovery device 1 stops, or if the surface 13 of the heated liquid 6 suddenly decreases, the heat pipe 5
The heat dissipation section 5b is not cooled.

On the other hand, the heat medium 9 continues to evaporate in the heat absorption section 5a.

There is a problem in that the internal pressure increases abnormally, which may eventually lead to damage to the beat pipe 5.

Therefore, a bypass is installed in the conveyance system for slabs and slag, and in the case mentioned above, the bypass is used.
Although it is conceivable to stop the heat supply to the heat pipe 5, it is difficult to provide a bypass in the conveyance system for slabs and the like since this is a continuous casting facility in a steelworks. Further, it is not preferable to restrict the flow of these heat sources 3 because it affects the operation rate of the entire plant.

In order to prevent damage to the heat pipe, for example, as described in Japanese Utility Model Application Publication No. 52-113467, a pressure plug made of a thin gold plate is provided at the end of the pipe.
It has been proposed that the pressure plug is implanted so that if the internal pressure of the heat pipe becomes too high, the pressure will break the pressure plug.

However, in order to break a thin metal plate using only the constant internal pressure of the heat pipe, it is necessary to control the material and thickness of the thin metal plate, as well as the tensile strength when attaching the thin metal plate, etc., which requires very strict control, which increases the cost. This results in high productivity and decreased productivity. Also, if the metal plate becomes even slightly thicker, it will not break due to internal pressure alone.

Even if a pressure plug is provided, there is a risk that the heat pipe may explode.

The present invention aims to eliminate such conventional drawbacks,
The purpose is to prevent heat pipes from being damaged.

[Means for solving problems]

In summary, the present invention aims to achieve this objective.

The present invention is directed to a waste heat recovery device that recovers waste heat from the heat source by arranging the heat absorbing part of the heat pipe along the heat source and locating the heat radiating part of the heat pipe within the heated fluid.

and a sealing member provided at an end of the heat pipe with a thin walled portion that moves due to the internal pressure of the heat pipe, and a rupture aid having a pointed end facing an outer surface of the thin walled portion and fixed to the end of the heat pipe. It is characterized by being configured by a combination of members.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIG.
This figure is an enlarged cross-sectional view of the end of the heat pipe 5.

In the figure, reference numeral 14 denotes a sealing member that seals the end of the heat pipe 5. This sealing member 14 is provided with a thin wall portion 14a that moves and ruptures due to the internal pressure of the heat pipe 5. The sealing member 14 is joined by welding 15.

Reference numeral 16 denotes a rupture auxiliary member provided on the back surface of the thin wall portion 14a.
A knife 16a that is fixed to the end of the heat pipe 5 and that damages the thin wall portion 14a and a communication hole tsb that releases the internal pressure inside the heat pipe 5 are provided.

In such a structure, the internal pressure of the top pipe 5! When the temperature rises to As, the internal pressure causes the thin wall portion 14a to bulge from the position indicated by the solid line in FIG. can be made more popular than the communication hole IGb.

below. The bursting pressure P of the thin wall portion 14a performed by the inventor,
The calculated thickness Ia of the inner part 14a and the measured value will be explained with reference to FIG.

Bursting pressure P can be determined using the following formula.

12X (1-r”)Xa' (IL,, P: Bursting pressure (kg/ci G)k
: Coefficient E: Longitudinal elastic tension of thin wall portion 14a (kg/nwn”) h: Thickness of thin wall portion 14a (kaku) w: Deflection amount at the center of thin wall portion 14a (day) r: Poisson's ratio of N interior 14a a: Radius of the thin wall portion 14a (n, n) At this time, 5US304 is used as the material of the thin wall portion 14a, and E=2. OX i O'(kg/nm"), r
=0.3. w=2.5 (mm) +a=9 (m
m). The 0 mark in Fig. 4 shows the calculated value, and the Δ mark shows the confirmation test result.
Experiments were conducted with nvn, 0.3511WI+, and 0.4mm, and as shown in Fig. 4, it was confirmed that the material ruptured near the total W value, proving that it is also effective as an end plate for the heat pipe 5. Ta.

In this way, due to the rupture of the thin plate portion 14a, the heat pipe 5
The internal pressure inside is released to the atmosphere through the thin plate portion 14a and the communication hole 16b, thereby making it possible to prevent the heat pipe 5 itself from bursting.

In addition, in the embodiment of the present invention, even if the internal pressure of the heat pipe 5 rises to a different point; t, only the thin plate portion 14a will burst, and the heat pipe 5 itself can be prevented from bursting.
The heat pipe 5 can be reused simply by replacing it with a new sealing member 14.
It also saves you the trouble of replacing it, and allows for quick repairs.

As described above, in the embodiment of the present invention, the thin wall portion 14a that moves due to the internal pressure of the heat pipe 5,
Since the protection device is configured by the knife 16a fixed to the end of the heat pipe 5, the distance between the thin wall portion 14a and the knife 16a can be adjusted to an accurate 7A, and damage to the protection device can be arbitrarily prevented depending on the rising pressure of the heat pipe 5. Can be adjusted.

The one in FIG. 5 is shown in another embodiment, and the difference from the one in FIG. 3 is that in the one in FIG. 3, the sealing member 14 and the end of the heat pipe 5 are attached by welding 15. However, in the one shown in Fig. 5, the sealing member 111 is attached using the nut 18.
It is tightened to the end of the heat pipe 5 by the following.

Thereby, the thin plate part 14a can be easily replaced with a new thin plate part 14a by removing and tightening the nut 18.

〔Effect of the invention〕

The present invention provides a sealing member having a thin wall portion at the end of the heat pipe that moves due to the internal pressure of the heat pipe;
By providing a rupture auxiliary member having a pointed end, even if the internal pressure of the heat pipe rises abnormally, it can be released into the air, thereby preventing damage to the heat pipe itself.

Even existing ones can be easily modified by simple modification work.

Furthermore, a rupture auxiliary member having a pointed end facing the outer surface of the thin plate part is provided, and the thin wall part can be easily ruptured as the internal pressure increases. Compared to the above, there is no need to strictly control the material and thickness of the thin-walled parts, which reduces costs and improves productivity.

Furthermore, since a bursting assisting member is provided to easily tear the thin walled part, the operation as a safety device (71) is highly reliable,
There is no need to worry about the heat pipe exploding even though it is equipped with a safety device, unlike conventionally proposed heat pipes.

[Brief explanation of the drawing]

Figures 1 and 2 show the waste heat recovery equipment.
The figure is a plan view, Figure 2 is a sectional view taken along the line Fig. 5 is an enlarged view showing another embodiment of Fig. 3. 5...Heat pipe, 14...Sealing Member, +4a...Thin plate part, 16...Supporting member, 16a...Knife, 16b...Communication hole. Figure 'L' Figure 3; 65匡I

Claims (1)

[Claims] In a heat pipe in which the heat absorbing part of the heat pipe is arranged along the heat source and the heat dissipating part of the heat pipe is located in the heated liquid to recover waste heat from the heat source, the end of the heat pipe has a It is characterized by being constructed by a combination of a sealing member having a thin wall portion that moves due to internal pressure, and a rupture assisting member having a pointed end facing the outer surface of the thin wall portion and fixed to the end of the heat pipe. Waste heat recovery equipment.