JP2009208837A - Sloshing damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sloshing damping device which can be stored as required, capable of not only damping the force of an upward liquid current in the vertical direction which causes the occurrence of a sloshing phenomenon, but also effectively suppressing the oscillation of a floating roof by preventing the liquid current from reaching the floating roof. <P>SOLUTION: The sloshing damping device hangs down that boards 3 from the floating roof 2 so as to immerse the boards in liquid stored in such a manner that the boards are inclined with respect to a level surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus for suppressing sloshing in a liquid storage tank.

  An example of a facility for storing a large amount of liquid such as oil or water is a floating roof type liquid storage tank. The use of a floating roof structure for large liquid storage tanks has the advantage that construction costs can be kept low, but the floating roof is greatly shaken by the occurrence of a sloshing phenomenon during an earthquake, and the stored liquid leaks outside the storage tank. May end up.

In order to cope with these problems, the sloshing phenomenon reduction technology that has been used in the past is to float a resistance plate anchored with a wire in the storage liquid, and to disturb the flow of the storage liquid to attenuate the kinetic energy. There is a sloshing suppression device (see Patent Document 1) that reduces the liquid flow in the vertical direction.
Japanese Patent Laying-Open No. 2005-280738

  However, the conventional sloshing reduction technology is intended to converge by reducing the kinetic energy of the liquid flow against the vertical movement of the stored liquid generated near the wall surface of the liquid storage tank when an earthquake occurs. In addition, there is nothing between the resistance plate and the floating roof, so the liquid flow upward in the vertical direction approaches the floating roof and pushes up the floating roof. There was a problem that could not be avoided. In addition, for liquid storage tanks with equipment such as piping inside, there is a possibility that the resistance plate may collide with those equipment when the floating roof is lowered or the stored liquid is shaken. There was a problem that it was difficult.

  The problem of the present invention is not only to attenuate the momentum of the upward liquid flow that causes the sloshing phenomenon, but also to prevent the liquid flow from reaching the floating roof to more effectively sway the floating roof. It is an object of the present invention to provide a liquid storage tank with a sloshing suppression device that can be suppressed and stored as necessary.

  In order to solve the above problems, the invention described in claim 1 is characterized by having a plate suspended from the floating roof so as to be immersed in the stored liquid in an inclined state with respect to a horizontal plane.

  The invention according to claim 2 is the sloshing suppression device according to claim 1, characterized in that the plate is suspended so as to be movable upward by a hanger such as a wire or a rope.

  A third aspect of the present invention is the sloshing suppressing device according to the first or second aspect, wherein the plate can be adjusted in installation height and inclination angle.

  A fourth aspect of the present invention is the sloshing suppressing device according to any one of the first to third aspects, wherein the plate is disposed in the vicinity of the wall surface of the liquid storage tank.

  A fifth aspect of the present invention is the sloshing suppression device according to any one of the first to fourth aspects, wherein a plurality of the plates are suspended in a vertical direction.

  A sixth aspect of the present invention is the sloshing suppression device according to any one of the first to fifth aspects, wherein a plurality of the plates are arranged side by side.

  ADVANTAGE OF THE INVENTION According to this invention, the energy which the flow of the upward direction of the storage liquid produced at the time of an earthquake has can be reduced, and at the same time, the flow of the storage liquid can be changed in a direction not affecting the occurrence of the sloshing phenomenon. As a result, the floating roof can be prevented from being pushed up by the vertical liquid flow, and the occurrence of the sloshing phenomenon can be more effectively suppressed.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a configuration of an embodiment of a sloshing suppression device to which the present invention is applied. 1 is a liquid storage tank, 2 is a floating roof, 3 is a plate, and 4 is a wire.

  As shown in FIG. 1, a plate 3 is suspended below the floating roof 2 so as to be immersed in the stock solution in a slanted state by a flexible material such as a wire 4. Yes. Incidentally, it is good also as a hanging tool using an elastic thing. The inclination direction of the plate 3 is preferably inclined so as to rise toward the center of the liquid storage tank 1. As will be described later, the plate 3 receives the liquid flow of the stock solution to attenuate the momentum and change the direction of the flow. Therefore, it is desirable to use a plate having a weight that does not easily shake in the liquid. Further, the vertically upward liquid flow a of the stored liquid generated at the time of the earthquake is prominent in the vicinity of the wall surface of the liquid storage tank 1, so a plurality of plates 3 are arranged side by side at a position close to the wall surface of the liquid storage tank 1. It is desirable to keep it.

  When an earthquake occurs in the vicinity of the liquid storage tank 1, the stored liquid in the liquid storage tank 1 is shaken and a liquid flow starts to be generated. At this time, in the vicinity of the wall surface of the liquid storage tank 1, the liquid flow a upward in the vertical direction is noticeable as described above. When the liquid flow a reaches the liquid level, the liquid level is raised and becomes a wave, and the floating roof 2 is pushed up, but the plate 3 can be bent like a wire 4 below the floating roof 2. When the liquid flow a flows from below and hits the plate 3, the plate 3 is pushed up as shown in FIG. 2 to absorb the kinetic energy of the liquid flow a. The momentum of the liquid flow a is attenuated.

  Further, since the plate 3 is suspended in an inclined state so as to rise toward the center of the liquid storage tank 1 as described above, the kinetic energy of the liquid flow a is absorbed when the liquid flow a hits the plate 3. At the same time, the flow direction is changed by the inclination of the plate 3, and as shown in FIG. 2, the liquid flow b that does not generate waves on the liquid surface flows toward the center of the liquid storage tank 1.

  In this way, by attenuating the momentum of the liquid flow a in the vertical direction by two means, the floating roof 2 can be prevented from being pushed up by the liquid flow a, and the occurrence of the sloshing phenomenon can be suppressed. Further, even when the floating roof 2 is slightly shaken, the damping effect of the liquid flow a by the plate 3 is large, so that it can be calmed down in a short time.

  By the way, there are cases where various facilities such as piping for adjusting the temperature of the liquid and a scaffold for maintenance are installed in the liquid storage tank 1, but the floating roof 2 is lowered with the liquid level, and the plate 3 If there is a risk of hitting such equipment, the plate 3 and equipment can be installed by providing a mechanism that allows the wire 4 to be pulled up from the top of the floating roof 2 by providing a hole in the floating roof 2 and passing the wire 4 therethrough. It is possible to avoid collisions and avoid damage to equipment. Further, even if the liquid storage tank 1 approaches an empty state and the floating roof 2 and the bottom plate come close to each other, the plate 3 is not caught and is not in the way.

  If it is desired to further increase the sloshing suppression effect, the weight of the plate 3 can be adjusted, or a plurality of the plates 3 can be suspended in the vertical direction or the horizontal direction as shown in FIG. . The inclination angle of the plate 3 may be adjusted by moving the wire 4 up and down.

  In addition, the size, shape, number, material, inclination direction, suspension member, suspension member lifting means, etc. of the plate are arbitrary, and other specific details such as structure can be changed as appropriate. Of course.

It is a front view which shows the structure of one Embodiment of the sloshing suppression apparatus to which this invention is applied. It is a front view which shows the mechanism which changes the liquid flow direction of a stored liquid when the liquid flow by an earthquake generate | occur | produces in the liquid storage tank shown in FIG. It is a front view which shows the example of application of this invention for raising the sloshing suppression effect more.

Explanation of symbols

1 Liquid storage tank 2 Floating roof 3 Board 4 Wire (hanging tool)

Claims (6)

  An anti-sloshing device comprising a plate suspended from a floating roof so as to be immersed in a stored liquid in an inclined state with respect to a horizontal plane.   The sloshing suppression device according to claim 1, wherein the plate is suspended so as to be movable upward by a hanging tool such as a wire or a rope.   The sloshing suppression device according to claim 1, wherein the plate can be adjusted in installation height and inclination angle.   The sloshing suppression device according to any one of claims 1 to 3, wherein the plate is disposed close to a wall surface of the liquid storage tank.   The sloshing suppression device according to any one of claims 1 to 4, wherein a plurality of the plates are suspended in a vertical direction.   The sloshing suppression device according to any one of claims 1 to 5, wherein a plurality of the plates are arranged side by side.

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