JP2012161710A - Defoaming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defoaming device which can be made inexpensive, can be controlled easily and can be installed even in a position with a limited installation space.SOLUTION: A drainage ditch 3 formed from a drain outlet 1 toward the water discharge direction is provided. The drainage ditch 3 has a defoaming structure housing part 3a on the downstream side of the drain outlet 1. A defoaming structure 4 composed of a water-pervious material formed by intertwining a fibrous material is housed in the defoaming structure housing part 3a. Waste water is discharged through the defoaming structure 4 from the drain outlet 1.

Description

  The present invention relates to a defoaming apparatus that eliminates foam generated when wastewater from a thermal power / nuclear power plant or factory is discharged to the outside of the field.

  Conventionally, in facilities that require a large amount of cooling water, such as thermal power / nuclear power plants and steelworks, after the facility is constructed near the sea and the seawater pumped from the sea is used as cooling water, etc. The seawater is drained into the sea.

  In such a seawater circulation system, when the seawater is discharged from the drain outlet, it is mixed with air and a lot of bubbles are generated, and these bubbles are generated in the process until they float on the water. In some cases, it discolors by adsorbing, and even if it floats on the water, it does not disappear and flows to the offshore.

  Therefore, in order to prevent such bubbles from diffusing, the vicinity of the outlet of the drain outlet is surrounded by a defoaming fence or the like to limit the bubble diffusion range (for example, Patent Document 1), A method of spraying a foaming agent (for example, Patent Document 2) or a method of spraying water to eliminate bubbles (for example, Patent Document 3) has been developed.

JP 2008-194583 A JP 2000-342905 A JP 09-276745 A

  However, in the conventional technology using a defoaming fence as described above, a large space must be secured in order to install a pollution prevention film used as a defoaming fence, and its management is complicated. In particular, there has been a problem that, in the event of a disaster such as a typhoon, the pollution prevention film must be temporarily removed and then restored.

  On the other hand, in the technique using a conventional antifoaming agent or shower, there has been a problem that the spraying operation must be continuously performed while bubbles are generated, which is complicated and expensive.

  In view of such a conventional problem, the present invention has been made for the purpose of providing an antifoaming device that is inexpensive, easy to manage, and can be installed in a place where installation space is limited.

  The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving the intended purpose is that the drainage is performed in the defoaming apparatus for eliminating foam generated when drained from the drainage port. A water discharge path directed from the mouth toward the water discharge direction is provided, and the water discharge path is formed with a defoaming structure housing portion downstream of the drain port, and the fibrous material is entangled with the defoaming structure housing portion. The defoaming structure made of the water-permeable material formed in this way is accommodated and drained through the defoaming structure from the drainage port.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the defoaming structure includes a plurality of defoaming cylinders formed in a cylindrical shape having both ends opened by the water-permeable material. In addition, it is formed by arranging the defoaming structure housing portions adjacent to each other in the width direction with the length direction in the water discharge direction and combining them in a multi-stage arrangement in the vertical direction.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the defoaming structure housing portion is formed wider on the downstream side than the upstream side, and the defoaming structure is The cross-sectional area of the downstream end face is wider than the cross-sectional area of the upstream end face.

  According to a fourth aspect of the present invention, in addition to the structure of the first, second, or third aspect, the defoaming structure housing portion includes a holding hook-shaped tool that covers the outside of the defoaming structure. The holding hook is fixed to the water discharge channel.

  As described above, the defoaming apparatus according to the present invention is a defoaming apparatus that eliminates bubbles generated when drained from a drain outlet. The defoaming apparatus includes a water discharge channel directed from the drain port toward the water discharge direction. Has a defoaming structure housing portion downstream of the drainage port, and houses a defoaming structure made of a water-permeable material formed by entwining a fibrous material in the defoaming structure housing portion. In addition, by draining through the structure for defoaming from the drainage port, it can be installed even in a narrow place and can be installed at low cost. Further, the foam contained in the drainage is physically removed. It is possible to suppress the bubbles from spreading to the surface of the drainage destination.

  Further, in the present invention, the defoaming structure comprises a plurality of defoaming cylinders formed in a cylindrical shape having both ends opened by the water-permeable material, and the defoaming structure has its length direction directed to the water discharge direction. As a result of being formed adjacent to each other in the width direction of the structure housing portion and combined in a multi-stage arrangement in the vertical direction, a large number of voids can be taken inside, and high drainage performance can be ensured, It can be easily processed and managed.

  Further, in the present invention, the defoaming structure housing portion is formed wider on the downstream side than the upstream side, and the defoaming structure has a cross-sectional area on the downstream side end surface larger than a cross-sectional area on the upstream side end surface. By being formed, it is possible to reduce the momentum by suppressing the flow rate of water at the time of water discharge, and it is possible to suppress the bubbles from spreading far by increasing the rising speed of the bubbles.

  Furthermore, in the present invention, the defoaming structure housing portion includes a holding hook covering the outside of the defoaming structure, and the holding hook is fixed to the water discharge channel. It is possible to hold the defoaming structure on the water discharge channel in a stable state against water pressure, waves, and tides of water drained from the outlet, and it is necessary to remove it even in the event of a disaster such as a typhoon Can be easily managed.

It is a side view which shows an example of the use condition of the defoaming apparatus which concerns on this invention. It is a top view which shows the defoaming apparatus in FIG. It is a longitudinal cross-sectional view same as the above. It is the sectional view on the aa line in FIG. It is a top view which shows the state which removed the saddle-shaped tool for holding same as the above. It is sectional drawing which shows the outline of the cylinder material for defoaming.

  Next, embodiments of the present invention will be described based on the embodiments shown in FIGS. In the figure, symbol A is the sea, and symbol B is a drain pipe for discharging seawater used as cooling water in a thermal power / nuclear power plant or steelworks to the sea.

  In the drain pipe B, a drain port 1 opened in the horizontal direction is formed at the lower end thereof, and a defoaming device 2 is installed in the vicinity of the drain port 1.

  This defoaming device 2 is provided with a defoaming structure 4 on the downstream side of a groove-like water discharge channel 3 directed from the drain port 1 toward the water discharge direction, and the seawater discharged from the water discharge port 1 through the water discharge channel 3 downstream. While guiding to the sea on the side, the foam contained in the seawater is reduced through the defoaming structure 4.

  The water discharge channel 3 is formed by providing a water guide block 6 on a rubble mound 5 formed at the seaside, and a defoaming structure 4 is accommodated at a position spaced a predetermined distance downstream from the drain port 1. The defoaming structure housing portion 3a is formed. The predetermined distance can be appropriately determined based on the amount of drainage from the drainage pipe B or the like, but is preferably longer than the diameter of the drainage pipe B.

  This water guide block 6 is integrally formed with concrete, and is installed on the upper surface of the rubble mound 5 in a state where the upper surface of the bottom slab 6 a, that is, the bottom surface of the water discharge channel is exposed on the surface of the rubble mound 5.

  The bottom plate portion 6a of this water guide block has a trapezoidal shape as viewed from above, and side wall plates 6b and 6b are formed on both sides of the water block so that the both side wall plates 6b and 6b are connected to the bank. The seawater discharged from the drain port 1 is guided to the sea A.

  Further, the distance between the side wall plates 6b, 6b is narrow on the upstream side and wide on the downstream side, and the cross-sectional area of the defoaming structure housing portion 3a of the water discharge channel 3 becomes wider toward the sea side. ing.

  The defoaming structure housing portion 3 a is provided with a holding hook 7. The defoaming structure 4 is installed in the holding hook 7.

  The holding hook 7 has an upper lid member 7a arranged to cover the upper surface side of the defoaming structure 4, and a downstream lid member 7b arranged to cover the downstream side (sea side) of the defoaming structure 4. And an upstream cover member 7c arranged to cover the upstream side of the defoaming structure 4, and covers the outside of the defoaming structure 4.

  That is, the defoaming structure 4 surrounded by the lid members 7a to 7c and the both side wall plates 6b and 6b is stable against the water pressure and waves of seawater drained from the drain pipe B, tides and the like. It is held on the water guide block 6 in a state.

  Each of the lids 7a to 7c is formed with a lattice-like member, and restricts the movement of the defoaming structure 4 while not inhibiting the flow of seawater.

  Reference numeral 7d in the drawing is a fixing member for fixing the upper lid member 7a to the upper surface of the side wall plate 6b of the water guide block 6. The upper lid member 7a is disposed on the side wall via the fixing members 7d, 7d. While being fixed to the plate 6b, the sea side lid member 7a and the drain outlet side lid member 7c are supported by the upper lid member 7a.

  As shown in FIG. 4, the defoaming structure 4 includes a plurality of defoaming cylinders 8, 8... Formed in a thick cylindrical shape having both ends opened by a water-permeable material. They are arranged adjacent to each other in the width direction of the defoaming structure housing portion in the water discharge direction, and are formed by stacking rows of the defoaming cylinders 8, 8 ... in a vertical multi-stage arrangement. .

  Moreover, as shown in FIG. 5, the defoaming cylinder 8 arranged on both sides of each step is cut along the inner surface of the side wall plate 6b, and the defoaming structure 4 is formed on the upstream end surface. It is formed so that the area of the end face on the downstream side is wider than the area of.

  A mat-like defoaming member 9 made of the same water-permeable material as the defoaming cylinder 8 is laid on the upper surface of the defoaming structure.

  As shown in FIG. 6, the water-permeable material constituting the defoaming cylinder 8 and the defoaming member 9 is formed in a three-dimensional mesh shape by irregularly intertwining the resin fibrous materials 10, 10. And has a cross-sectional structure like dry loofah.

  Therefore, this water-permeable material has a high internal porosity and high water permeability. Moreover, such a water-permeable material has a structure that is lightweight and easy to process, and even when it is clogged, it can be easily cleaned by injecting a high-pressure jet or the like.

  In addition, as this water-permeable material, for example, Hettimalon (registered trademark) manufactured by Shinko Nylon Co., Ltd. can be used.

  In the defoaming apparatus constructed as described above, the defoaming cylinders 8, 8... Constituting the defoaming structure 4 have a three-dimensional mesh structure like a dry loofah as described above. Therefore, when the seawater containing foam passes between the fibrous materials 10, 10... Constituting the defoaming structure 4, the foam is physically ruptured and defoamed.

  On the other hand, the defoaming cylinders 8, 8... Constituting the defoaming structure 4 are cylindrical and drainage is performed through the hollow portion so that a high drainage amount can be secured. It has become.

  Moreover, since the cross-sectional area of the downstream end face of the defoaming structure 4 is wider than the cross-sectional area of the upstream end face, the flow rate of the seawater passing through the defoaming structure 4 is slower than the upstream side and drained. The momentum when you are reduced. On the other hand, since the rising speed of the bubbles is increased by reducing the flow velocity of the seawater, even if the bubbles remain without being defoamed in the defoaming structure 4, the bubbles are close to the surface of the defoaming device. It is possible to suppress the diffusion of bubbles on the sea.

  The foam diffusion range when this defoaming device is used is a range of about 2 to 5 m in radius from the drain port, and the foam diffusion range when the defoaming device 2 is not used (the radius 15 to 15 from the drain port). Compared to about 30 m).

  In addition, although the above-mentioned Example demonstrated the example which used the cylindrical thing for the defoaming cylinder, the defoaming cylinder may be a square tube shape or a polygonal tube shape. In addition, as the defoaming structure, a bowl-shaped one or the like may be used instead of the above-described defoaming cylinder, and a through-hole is formed in the discharge direction after the mat-shaped defoaming members are stacked. You may make it do.

  Furthermore, the structure for defoaming may be configured by combining a member made of the water-permeable material and a member made of another material.

  Further, the drainage in the present invention is not limited to seawater, and the drainage destination may be a fresh water surface such as a river or a lake.

A Sea B Drain pipe 1 Drain port 2 Defoaming device 3 Drainage channel 4 Defoaming structure 5 Rubble mound 6 Water guide block 7 Holding hook 8 Defoaming cylinder 9 Defoaming member 10 Fibrous material

Claims (4)

In the defoaming device that erases the foam generated when draining from the drain,
A drainage channel directed from the drainage port toward the drainage direction is provided, and a defoaming structure housing portion is formed on the downstream side of the drainage port in the drainage channel, and a fibrous material is provided in the defoaming structure housing unit. A defoaming apparatus characterized in that a defoaming structure made of a water-permeable material formed by entanglement is accommodated and drained through the defoaming structure from the drain port.   The defoaming structure has a plurality of defoaming cylinders formed in a cylindrical shape with both ends opened by the water-permeable material, with the length direction of the defoaming structure housing portion being in the water discharge direction. The defoaming device according to claim 1, wherein the defoaming device is formed by being arranged adjacent to each other in the width direction and combined in a multi-stage arrangement in the vertical direction.   The defoaming structure housing portion is formed such that the downstream side is wider than the upstream side, and the defoaming structure is formed such that the cross-sectional area of the downstream end face is wider than the cross-sectional area of the upstream end face. The antifoaming device according to 1 or 2.   The said defoaming structure accommodating part is provided with the holding hook covering the outer side of the said defoaming structure, and fixed the said holding hook to the said water discharge channel to Claim 1, 2, or 3 Defoaming device as described.

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