JP3181185B2 - Defoaming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defoaming device provided at a discharge port of seawater for cooling of a power plant or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 3 and 4, foams 11 on the surface are collected by a foam stopper 12 or a gate installed in a water discharge channel 10 to form a bubble pool 15, which is sprayed with a water spray 13. An antifoaming device that erases the foam 11 by hitting or passing through water is often used. 11 '
Is floating garbage. In addition, as bubble accumulation mechanism,
As disclosed in Japanese Patent Publication No. 0-183007, there is an example in which a water discharge channel wall is gradually narrowed to reduce a sprinkling portion.

[0003]

The above-described conventional defoaming device has the following problems. (1) In the case of using a water spray, fine bubbles are generated because water hits the water surface. (2) Floating dust collects and the bubble prevention mechanism is apt to break down. (3) In the case where the spray is fixed, the sprinkling and defoaming effect may be reduced due to the fluctuation of the water level.

An object of the present invention is to provide a defoaming device which can solve the above problems.

[0005]

The defoaming device according to the present invention has an upstream end attached to a side surface of a water channel, has a portion that is drooped from the water surface into the water, and has a downstream side approaching the opposite shore so that water flows in the upstream side. The floating fence is arranged such that the opening is wide and the downstream water outflow opening is narrow, and the high-temperature gas is supplied to the water surface near the downstream water outflow opening provided on the mother pipe attached to the float. It consists of a jet nozzle.

[0006]

According to the present invention, water entering from the upstream wide water inflow opening formed by the floating fence flows out from the downstream narrow water outflow opening, and bubbles floating on the water surface are collected in the narrow water outflow opening. To form a foam layer.

Since the high-temperature gas is injected from the nozzle toward the vicinity of the outlet of the narrow water, the amount of the high-temperature gas released per unit length can be increased. As the surface tension of the foam becomes weaker, the foam receives the wind force of the gas, and the foam can be effectively crushed and disappeared. In addition, since the nozzle is provided in the mother pipe attached to the float , even if the water level changes, the nozzle moves up and down to follow this, and always keeps the set distance to ensure that the hot gas flows downstream. Can be injected near the outflow opening of narrow water.

Further, in the present invention, since water flows from the upstream wide water inflow opening formed by the floating fence through the downstream narrow water outflow opening, floating foreign matters are accumulated and injected from the injection nozzle. The defoaming action of the hot gas is not impaired.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. Reference numeral 10 denotes a water discharge channel composed of a side surface 7 and a bottom surface 8 through which seawater flows in the direction of a white arrow, and two floating fences 3 forming a pair on both side surfaces 7 via the fixing brackets 2 respectively.
Are mounted at the same position in the seawater flow direction. The floating fence 3 is configured by bonding or fixing a floating body portion 14 such as a plastic sphere or a cylindrical object and a sheet portion 14a such as seawater-resistant resin, and is suspended from the water surface of the flow channel into seawater. The seawater flow path is formed between them, and means such as connecting the downstream upper ends of the floating fences 3 and 3 with wires (not shown),
As shown in FIG. 1, the floating fences 3, 3 are arranged so as to approach each other toward the downstream side, and the inflow opening A of the upstream seawater is wide and the outflow opening B of the downstream seawater is narrow. .

Downstream of the floating fence 3 and in the vicinity of the seawater outflow opening B, a mother tube 5 having floats 4 and 4 mounted below the water discharge passage 10 by support rods 4a across the water discharge channel 10.
Are arranged, and the mother pipe 5 is connected via a universal joint 9 to a high-temperature gas supply pipe 5 a arranged outside the water discharge channel 10. Further, the mother pipe 5 is provided with a plurality of nozzles 6 for injecting the high-temperature gas 16 obliquely downward toward the upstream side toward the bubble pool 15 on the water surface near the seawater outflow opening B. As the high-temperature gas 16, combustion exhaust gas, air heated by a heater, steam, or the like can be used.

In this embodiment, even if the level of seawater in the water discharge channel 10 fluctuates due to ebb and flow of the tide, the floating fences 3 and 3 having the floating body portion 14 move up and down in response to this, and the water discharge channel 1
The seawater flowing inside flows into a seawater outflow opening B narrower than the wide seawater inflow opening A formed by the floating fences 3,3. Therefore, the bubbles 11 in the seawater gather at the outflow opening B of the narrow seawater to form a bubble pool 15.

Since the mother pipe 5 having the floats 4 and 4 is connected to the high-temperature gas supply pipe 5a by the universal joint 9, even if the water level of the seawater in the water discharge channel 10 fluctuates, the main pipe 5 has the same structure. Up and down, the mother pipe 5 is always held at a position higher than the seawater level by a certain height, and always keeps a predetermined distance from the nozzle 6 toward the bubble pool 15 on the water surface near the seawater outflow opening B. High-temperature gas 16 is injected.

As described above, the hot gas 16 is injected into the bubble pool 15 collected near the narrow outflow opening B of seawater, so that the amount of the hot gas 16 released per unit length increases. Due to the thermal action of the gas 16, the surface tension of the foam is weakened and the wind acts on the foam, so that the foam can be effectively crushed and eliminated.

The seawater in the water discharge channel 1 flows in through the seawater inflow opening formed by the floating fences 3 and 3 and flows out through the seawater outflow opening B. The defoaming action of the high-temperature gas 16 injected from the nozzle 6 while standing is not hindered.

It is preferable that the interval between the plurality of nozzles 6 is set so that bubbles on the surface of seawater can be sufficiently eliminated, and the height of the nozzles 6 on the surface of water is set to 1 m or less. .

In the above embodiment, two floating fences form a wide inflow opening for seawater on the upstream side and a narrow outflow opening for seawater on the downstream side, but the upstream end of one floating fence is connected to the drainage channel. The floating fence and the other side of the spillway may be mounted on one side to form a wide upstream seawater inlet opening and a downstream narrow seawater outlet opening.

[0017]

Since the present invention has the structure described in the claims, the following effects can be obtained. (1) The defoaming efficiency is good due to the synergistic effect of the hot gas injection and the hot gas injection. (2) Since the bubbles are collected by the floating fence, the installation range of the nozzle for jetting the high-temperature gas can be reduced. (3) The height of the nozzle for injecting the high-temperature gas can be set at a constant height above the water surface, and the defoaming efficiency does not decrease even if the water level varies.

[Brief description of the drawings]

FIG. 1 is a plan view of a defoaming device according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the embodiment.

FIG. 3 is a plan view of a conventional defoaming device.

FIG. 4 is a longitudinal sectional view of the conventional defoaming device.

[Explanation of symbols]

 2 Fixture 3 Floating fence 4 Floater 4a Support rod 5 Mother pipe 5a Hot gas supply pipe 6 Nozzle 7 Side surface of water discharge channel 8 Bottom of water discharge channel 9 Free joint 10 Water discharge channel 11 Bubble 14 Floating body part 14a Sheet part 15 Bubbles 16 High-temperature gas A Seawater inflow opening B Seawater outflow opening

Claims (1)

(57) [Claims] 1. An upstream end is attached to a side surface of a water channel and has a portion that is suspended from the water surface into the water, and the downstream side is on the opposite bank.
Approximated allowed upstream of floating fence outflow opening of the inflow opening is wider downstream of water in the water is arranged to be narrower, and floating
A defoaming device comprising a nozzle provided in a mother pipe attached to a child and for injecting a high-temperature gas toward a water surface near an outflow opening of the downstream water.