JP7365258B2 - Sloshing absorption mechanism of heat storage tank - Google Patents

Description

The present invention relates to a sloshing absorption mechanism for ensuring earthquake resistance of a heat storage tank installed underground.

Conventionally, when earthquakes cause shaking to oil tanks installed in oil refineries or storage tanks installed in chemical plants, the liquid level stored in the tank shakes, causing the liquid level to fluctuate. It is known that so-called sloshing, in which liquid leaks outside the tank, occurs.

Various structures are known as a countermeasure against such sloshing. For example, as described in Patent Document 1, a float structure is placed under a floating roof that covers the liquid stored in a tank. and a damping body supported by the float structure to attenuate the flow velocity of the liquid, wherein the float structure has a planar structure formed by combining a plurality of rod-shaped elements, and a damping body that damps the flow velocity of the liquid by contacting the floating roof with the floating roof. A sloshing damping device is known that includes a cushioning material for preventing damage to a planar frame, in which the cushioning material is formed into a ring shape or a C-shape and is fitted onto the rod-shaped element. .

According to the sloshing damping device described in Patent Document 1, the possibility that the cushioning material falls off the rod-shaped element is extremely small, so damage caused by contact with the floating roof can be prevented for a long period of time. It becomes possible. In particular, if the cushioning material is made into a complete ring shape, it will not fall off from the rod-shaped element unless it is torn off, and if the cushioning material is made into a ring or C-shape, it will not require the use of adhesives or bolts. Both can be securely fixed to the rod-shaped element, making it possible to reduce the number of parts and assembly man-hours, which in turn makes it possible to reduce the manufacturing cost of the sloshing damping device. In addition, since the planar frame can be disassembled into a plurality of rod-like elements, it can be easily transported even if the transport route is narrow.

Patent No. 4787690

However, according to the sloshing damping device described in Patent Document 1, the cushioning material is formed into a ring shape or a C-shape and is fitted onto the rod-shaped element, which makes the damping structure complicated and requires installation due to an increase in the number of parts. The problem was that it was difficult to keep costs down.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a sloshing absorption mechanism for a heat storage tank that can absorb sloshing in a heat storage tank with a simpler structure.

The sloshing absorption mechanism for a heat storage tank according to the present invention is a sloshing absorption mechanism for a heat storage tank formed by excavating the ground so that a heat medium can be stored therein, and comprising: a heat-resistant and water-shielding sheet in contact with the excavated portion of the ground; a heat insulating lid in contact with the surface of the stored heat medium, a predetermined clearance height from the surface of the ground to the surface, and an outer edge of the heat-resistant and water-shielding sheet and the heat insulating lid. , having a folded part that is overlapped and joined along the margin height, the folded part has a pressure relief that communicates the inside and outside of the heat storage tank, and the pressure relief is provided from the folded part. It is characterized by having an extending first tube portion and a second tube portion bent at a substantially right angle from the distal end of the first tube portion.

Moreover, in the sloshing absorption mechanism for a heat storage tank according to the present invention, it is preferable that the tip of the second pipe portion faces in a direction opposite to the folded portion.

Further, in the sloshing absorption mechanism for a heat storage tank according to the present invention, it is preferable that the pressure release includes a release mechanism that connects the inside and the outside when the pressure inside the heat storage tank exceeds a predetermined pressure. .

Further, in the sloshing absorption mechanism for a heat storage tank according to the present invention, it is preferable that the release mechanism is a lid attached to the tip of the pressure release.

Further, in the heat storage layer sloshing absorption mechanism according to the present invention, it is preferable that the pressure relief is formed in the outer edge of the heat insulating lid close to the folded portion.

The above summary of the invention does not list all the necessary features of the invention, and subcombinations of these features may also constitute the invention.

According to the sloshing absorption mechanism of the heat storage tank according to the present invention, there is a predetermined margin height from the ground surface to the surface of the heat medium, and the heat-resistant water-shielding sheet and the heat insulating lid are folded back along the margin height. Since they are joined by folded parts, even if sloshing occurs and the stored heat medium sways, the extra height can prevent the heat medium from leaking to the outside of the heat storage tank. Even in the case where shaking exceeding 100 mm occurs, the shaking of the heat medium due to sloshing can be absorbed by extending the folded portion.

FIG. 3 is a cross-sectional view of the sloshing absorption mechanism of the heat storage tank according to the present embodiment. An enlarged view of part A in FIG. 1. A diagram showing a state where the water level has risen due to sloshing. FIG. 4 is a diagram showing a state in which the water level has further risen from the state in FIG. 3; FIG. 3 is a cross-sectional view showing a modification of the sloshing absorption mechanism of the heat storage tank according to the present embodiment. An enlarged view of part B in FIG. 5.

Hereinafter, preferred embodiments for carrying out the present invention will be described using the drawings. Note that the following embodiments do not limit the inventions claimed in each claim, and not all combinations of features described in the embodiments are essential to the solution of the invention. .

FIG. 1 is a sectional view of the sloshing absorption mechanism of the heat storage tank according to the present embodiment, FIG. 2 is an enlarged view of section A in FIG. 1, and FIG. 3 is a diagram showing a state in which the water level has risen due to sloshing. 4 is a diagram showing a state in which the water level has further risen from the state in FIG. 3, FIG. 5 is a sectional view showing a modification of the sloshing absorption mechanism of the heat storage tank according to this embodiment, and FIG. is an enlarged view of part B in FIG. 5.

As shown in FIG. 1, the heat storage tank 1 according to the present embodiment is a heat storage tank with a rectangular top surface of about 90 m on a side, and is illustrated as a hot water production unit that supplies hot water to the heat storage tank 1. No heat plant attached. This heat plant may have any configuration as long as it can produce hot water as a heat medium, but is preferably configured as a solar thermal plant using solar thermal panels, for example.

In the heat storage tank 1 according to the present embodiment, hot water W serving as a heat medium is stored in the heat storage tank 1 by being supplied from a heat plant (not shown) to a hot water supply water supply device 3 via a hot water supply pipe 4. There is. Note that the hot water supply and water supply device 3 is preferably held within the heat storage tank 1 by support piles 5.

The heat storage tank 1 is preferably formed by excavating the ground G, and the side surface of the heat storage tank 1 is preferably formed into a slope 2. In addition, a heat-resistant and water-shielding sheet 11 is attached to cover the slope surface 2 and the bottom surface, which are the interface between the heat storage tank 1 and the ground G, to prevent groundwater from entering into the ground G and heat exchange. There is. In addition, if the groundwater level is high and interferes with the heat storage of hot water W stored in the heat storage tank 1, an impermeable wall is formed near the heat storage tank 1, and groundwater pumping equipment such as a deep well is used. You can also try to insulate it. In addition, by forming the side surface of the heat storage tank 1 into the slope 2 in this way, the excavation work of the heat storage tank 1 can be easily performed.

The heat-resistant and water-shielding sheet 11 coated on the slope 2 and bottom of the heat storage tank 1 is installed to insulate the hot water in the heat storage tank 1 and prevent the hot water from leaking to the ground G. Various materials such as a polyethylene sheet can be used as long as the sheet has waterproof and waterproof properties.

Further, the upper surface of the heat storage tank 1 has an opening on the ground surface GL by excavating the ground G, but the opening is closed by a heat insulating lid 20 having heat insulating properties. The heat insulating lid 20 may be made of any material as long as it can keep the hot water stored in the heat storage tank 1 warm, but for example, as shown in FIG. A heat insulating sheet laminated with a skin 22 made of polyethylene or the like can be used.

Next, the sloshing absorption mechanism of the heat storage tank 1 according to this embodiment will be explained. The surface of the hot water W stored in the heat storage tank 1 is stored with a margin height h such that the surface is a predetermined height lower than the surface GL of the ground G. The margin height h can be set appropriately as long as it can absorb the shaking of the hot water W when the surface of the hot water W shakes due to sloshing, but it is preferable to set it to about 1.5 m, for example. .

Further, the outer edge of the heat-resistant and water-shielding sheet 11 is formed with a heat-resistant and water-shielding sheet-side folded part 32 that extends along the slope 2 by an allowance height h, and the outer edge of the heat-insulating cover 20 is formed with an allowance along the slope 2. A heat insulating lid side folded portion 31 is formed which extends by a height h. The heat-resistant water-shielding sheet-side folded part 32 and the heat-insulating lid-side folded part 31 overlap each other along the margin height h of the slope 2, and are joined to each other at the position of the ground surface GL to form the folded part 30. .

A pressure relief 40 is attached to the heat insulating lid side folded portion 31 of the folded portion 30, and the pressure relief 40 enables communication between the inside and the outside of the heat storage tank 1. The pressure relief 40 is formed by a tubular first pipe part 41 extending from the heat insulating lid side folded part 31, and bent at a substantially right angle from the tip of the first pipe part 41 so as to face in a direction opposite to the folded part 30. A lid body 43 serving as a release mechanism is fitted into the tip of the second tube portion 42 to close it. Note that the lid 43 is attached so that it can be easily removed when the pressure inside the heat storage tank 1 rises above a predetermined pressure.

The pressure relief 40 is preferably formed in the folded portion 30 close to the joint portion between the heat-insulating lid-side folded portion 31 and the heat-resistant and water-shielding sheet-side folded portion 32 . Further, it is preferable that a plurality of pressure vents 40 are formed along the outer edge of the heat insulating lid 20, and for example, it is preferable that they are formed at intervals of 10 m.

Furthermore, the tip of the second pipe part 42 of the pressure release 40 is formed so as to face toward the center of the heat storage tank 1 when the heat insulation lid side folded part 31 becomes horizontal due to a rise in water level due to sloshing, which will be described later. and is suitable. By arranging the tip in this manner, the tip of the second tube section 42 is normally directed downward, which prevents foreign matter from entering, and the water level rises due to sloshing, causing the lid body 43 to Even if the heat storage tank 1 comes off, the hot water W inside the heat storage tank 1 is discharged onto the heat insulating lid 20 of the heat storage tank 1, thereby preventing damage to the neighborhood due to hot water W leaking outside the heat storage tank 1. be able to.

Next, the operation of the sloshing absorption mechanism of the heat storage tank 1 according to the present embodiment will be explained with reference to FIGS. 3 and 4. As shown in FIG. 3, when the water level of the hot water W in the heat storage tank 1 rises due to an earthquake or the like, the hot water W flows between the heat-insulating lid-side folded part 31 of the folded part 30 and the heat-resistant and water-shielding sheet-side folded part 32. , and absorbs the shaking by the amount of extra height h. At this time, the heat-insulating lid-side folded part 31 and the heat-resistant and water-shielding sheet-side folded part 32 are joined to each other, so the hot water W is retained within the heat-insulating lid 20, the heat-resistant and water-shielding sheet 11, and the folded part 30 to accumulate heat. Leakage to the outside of tank 1 is prevented.

Furthermore, when the hot water W shakes greatly, the water pressure applied to the pressure relief 40 increases as shown in FIG. It is discharged to the outside. At this time, since the tip of the second pipe portion 42 faces toward the center of the heat storage tank 1, the discharged hot water W is discharged onto the heat insulating lid 20.

The heat storage tank 1 according to the present embodiment has been described with respect to the case where the side surface is formed by the slope surface 2, but as shown in FIG. It may also be formed on a surface substantially perpendicular to the surface. Even when formed in this way, the water surface of the hot water W is located at a margin height h from the ground surface GL, and as shown in FIG. A folded portion 30 in which the portion 31 and a heat-resistant and water-shielding sheet-side folded portion 32 formed at the outer edge of the heat-resistant and water-shielding sheet 11 are overlapped is arranged along the clearance h.

Moreover, in this case, the pressure release 40 is attached to the heat insulating lid side folded part 31, and is arranged so that the tip thereof faces downward. At this time, a lid 43 may be attached to the tip of the pressure relief 40, or a one-way valve may be attached to the tip of the pressure relief 40 without fitting the cover 43.

As described above, according to the sloshing absorption mechanism of the heat storage tank according to the present embodiment, the water surface of the hot water W in the heat storage tank 1 has a margin height h that is a predetermined distance away from the ground surface GL, and the heat insulation The outer edges of the lid 20 and the heat-resistant and water-shielding sheet 11 are joined by folded parts 30 that are folded back and overlapped along the margin height h, so the structure is simpler, and the water level does not change when the hot water W shakes due to an earthquake or the like. Even if the oscillations fluctuate, the fluctuations can be absorbed.

In addition, the sloshing absorption mechanism of the heat storage tank according to the present embodiment described above has been described in the case where the opening of the heat storage tank 1 is formed in a substantially rectangular inverted pyramid shape or rectangular parallelepiped shape, but the shape of the heat storage tank 1 is The shape is not limited to this, and may be formed into an inverted conical shape, for example. It is clear from the claims that such modifications or improvements can be included within the technical scope of the present invention.

1 heat storage tank, 2 slope, 11 heat-resistant water-shielding sheet, 20 heat-insulating lid, 21 heat-insulating material, 22 skin, 30 folded part, 31 heat-insulating lid side folded part, 32 heat-resistant water-shielding sheet side folded part, 40 pressure release, 41 1st pipe part, 42 2nd pipe part, 43 lid body, h free height, G ground, GL ground surface.

Claims (5)

A sloshing absorption mechanism for a heat storage tank formed by excavating the ground so that a heat medium can be stored therein,
a heat-resistant and water-shielding sheet in contact with the excavated portion of the ground;
and a heat insulating lid in contact with the surface of the stored heat medium,
There is a predetermined clearance height from the ground surface to the surface,
The outer edge of the heat-resistant water-shielding sheet and the heat-insulating lid has a folded part that overlaps and joins along the margin height,
The folded part has a pressure relief that communicates the inside and outside of the heat storage tank,
The sloshing of the heat storage tank is characterized in that the pressure relief has a first pipe part extending from the folded part and a second pipe part bent at a substantially right angle from the tip of the first pipe part. Absorption mechanism. The sloshing absorption mechanism for a heat storage tank according to claim 1 ,
A sloshing absorption mechanism for a heat storage tank, wherein a tip of the second pipe portion faces in a direction opposite to the folded portion. The sloshing absorption mechanism for a heat storage tank according to claim 1 or 2 ,
A sloshing absorption mechanism for a heat storage tank, wherein the pressure release includes a release mechanism that connects the inside and the outside when the pressure inside the heat storage tank exceeds a predetermined pressure. The sloshing absorption mechanism for a heat storage tank according to claim 3 ,
The sloshing absorption mechanism for a heat storage tank, wherein the release mechanism is a lid attached to the tip of the pressure release. The sloshing absorption mechanism for a heat storage tank according to any one of claims 1 to 4 ,
A sloshing absorption mechanism for a heat storage tank, wherein the pressure relief is formed near the folded portion of the outer edge of the heat insulating lid.

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