JPH0522092U - Floating bubble removal device for discharge channel - Google Patents

Abstract

(57) [Summary] [Purpose] Effectively collect and defoam bubbles floating on the surface of the discharge channel without increasing equipment and operating costs. It also eliminates the need to adjust the height of the raft due to changes in tide level. [Structure] A raft (floating bubble removing device 1) having a width approximately the same as that of the underdrain is inserted into the underdrain side of the boundary between the underdrain and the open underwater, and centrifugal defoamers 5 to 7 are brought out to the open underwater side. The vertical electric motors 6 and the impellers of the centrifugal defoamers 5 to 7 are driven. At this time, the bubbles that have flowed along with the hot drainage along the ceiling surface of the underdrain at a certain speed and the hot drainage of the water surface portion are guided into the three-dimensional net 2 incorporated in the raft and flowed to the downstream side, While decelerating to a state where the flow velocity is almost zero, the bubbles are gradually floated on the three-dimensional net 2 before reaching the centrifugal defoamer body 5, and the impeller inside the centrifugal defoamer body 5 The centrifugal defoamer body 5 is sucked into the centrifugal defoamer body 5 and mechanically crushed by the centrifugal force of the impeller to separate into air and seawater, and the separated air is passed through the exhaust pipe 7 and the centrifugal defoamer. Exhaust to the outside of the main body 5 and return the separated seawater to the flow of warm wastewater. At this time, since the three-dimensional net 2 is floated and held by the rod-shaped float 3, it is not necessary to adjust the height position of the raft due to the fluctuation of the tide level.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for removing floating bubbles in a discharge channel that collects and defoams bubbles floating on the water surface of the discharge channel.

[0002]

[Prior Art]

 A large amount of seawater is used as cooling water in the condensers of thermal power plants and nuclear power plants, and after use, it is discharged to the discharge channel as warm wastewater.

[0003]

[Problems to be solved by the device]

 When seawater is used as the cooling water, bubbles are unavoidable, and a number of bubbles are generated, such as pollution of the fish net due to bubbles adhering, salt damage due to bubbles scattering, and effects on the landscape. In order to defoam the above bubbles, it is necessary to take measures such as installing a straightening vane in the foaming part, laying an antifoaming pipe, or installing them in combination, but these are fundamental. The current situation is that it is merely a measure to reduce the amount of foaming, not a countermeasure.

The causes of bubbles include a culvert, a water level difference when flowing through an open culvert, spillage, and entrainment of turbulent water surface air caused by jumping. When seawater for circulation passes through a condenser, One of the major causes is that the dissolved air in seawater is separated due to a vacuum due to the siphon effect. Although sprinkling with fresh water (or seawater (although the effect is low)) is effective for defoaming the generated foam, a large amount of fresh water is required, which increases equipment costs and operation costs.

Further, a method of installing a weir such as an oil fence on the sea surface in order to collect bubbles floating on the sea surface of the discharge channel has been conventionally known, but in this weir structure, the flow velocity on the sea surface is lowered. It is not possible to overflow the bubbles collected from the weir such as oil fence, or return the collected bubbles from the bottom of the weir to the original sea surface and float it again on the sea surface, which makes the foam effective. There was a problem that it could not collect bubbles.

The present invention is proposed in view of the above problems, and an object thereof is to effectively collect bubbles floating on the water surface of a discharge channel without increasing facility costs and operating costs. And can defoam. Another point is to provide a device for eliminating floating bubbles in the discharge channel that eliminates the need to adjust the height of the raft due to fluctuations in tide level.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the device for removing floating bubbles in a water discharge channel according to the present invention comprises a three-dimensional net made by combining a semi-rigid string made of plastic or metal into a gourd fiber and a thick wall or band. , And the rod-like floats that float and hold this three-dimensional net on the water surface are alternately arranged in parallel, the floats are positioned on both sides in the width direction, and the overall width is almost the same as the underdrain width. The whole is assembled in a raft shape, an edge plate is attached to one end of the raft in the longitudinal direction, and a centrifugal defoamer is attached to the edge plate.

[0008]

[Action]

 The floating bubble removing device of the discharge channel of the present invention is configured as described above, and a raft (floating bubble removing device) having substantially the same width as the underdrain is inserted into the underdrain side of the boundary between the underdrain and the open drain, Put the centrifugal defoamer on the open side and drive this centrifugal defoamer. At this time, the bubbles flowing along with the hot drainage at a certain speed along the ceiling surface of the underdrain and the hot drainage of the water surface are guided into the three-dimensional net incorporated in the raft, and flow to the downstream side, and the flow velocity is reduced. While decelerating to a state of almost zero, the bubbles are gradually floated on the three-dimensional mesh until they reach the centrifugal defoaming machine, and the impeller inside the centrifugal defoaming machine enters the defoaming machine. It is sucked and mechanically crushed by the centrifugal force of the impeller to separate it into air and seawater.The separated air is exhausted to the outside of the centrifugal defoamer main body through an exhaust pipe, and the separated seawater is warmed to drain. Return to the flow of.

[0009]

【Example】

 Next, the floating bubble removing device of the present invention will be described with reference to an embodiment shown in FIGS. 1, 2 and 3. 1 is a floating bubble removing device, 2 is a three-dimensional net, and this three-dimensional net 2 is A semi-rigid string made of plastic or metal is made into a hemp fiber shape and is formed into a thick-walled band shape.

Reference numeral 3 denotes a rod-shaped float that floats and holds the three-dimensional net 2 on the water surface. The float 3 and the three-dimensional net 2 are alternately arranged in parallel, and the floats 3 are positioned on both sides in the width direction. At the same time, the overall width is made approximately the same as the underdrain width, and the whole is assembled in a raft shape. 4 is an edge plate attached to one end of the raft in the longitudinal direction, 5 is a centrifugal defoamer body, and this centrifugal defoamer body 5 is attached to the upstream side surface of the edge plate 4 in the flow direction of warm waste water. It Further, 6 is a vertical electric motor mounted on the upper part of the centrifugal defoamer main body 5, and 7 is an exhaust pipe extending from the centrifugal defoamer main body 5 to the downstream side in the hot drainage flow direction. An impeller (not shown) is installed inside 5, and this impeller is driven by a vertical electric motor 6.

Next, the operation of the floating bubble removing device for the water discharge channel shown in FIGS. 1, 2, and 3 will be specifically described. As shown in Fig. 2, insert a raft (floating bubble removal device 1) of approximately the same width as the underdrain into the underdrain side at the boundary between the underdrain and the open drain, and put out centrifugal defoamers 5-7 to the open drain side. Then, the vertical electric motor 6 and the impeller of the centrifugal defoamers 5 to 7 are driven. At this time, the bubbles flowing along with the hot drainage at a certain speed along the ceiling surface of the underdrain and the hot drainage of the water surface are guided into the three-dimensional net 2 incorporated in the raft and allowed to flow downstream. Then, while decelerating to a state where the flow velocity is almost zero, the bubbles are gradually floated on the three-dimensional net 2 until they reach the centrifugal defoamer body 5, and the centrifugal defoamer body 5 The centrifugal impeller inside the centrifugal defoamer main body 5 sucks it by the internal impeller, and mechanically crushes it by the centrifugal force of the centrifugal impeller to separate it into air and seawater, and separate the separated air through the exhaust pipe 7. After that, the air is discharged to the outside of the centrifugal defoamer body 5, and the separated seawater is returned to the flow of warm wastewater.

At this time, since the three-dimensional net 2 is floated and held by the rod-shaped float 3, it is not necessary to adjust the height position of the raft due to the fluctuation of the tide level.

[0013]

[Effect of the device]

 As described above, the floating foam removing apparatus of the present invention has a centrifugal type defoaming machine in which a raft (floating foam removing apparatus) having a width approximately the same as that of the underdrain is inserted into the underdrain side of the boundary between the underdrain and the open drain. Take it out to the open side and drive this centrifugal defoamer. At this time, the bubbles that flowed along with the hot drainage along the ceiling surface of the underdrain at a certain speed and the hot drainage of the water surface were guided into the tertiary mesh incorporated in the raft and allowed to flow downstream. While decelerating to a state where the flow velocity is almost zero, the bubbles are gradually levitated on the three-dimensional mesh until they reach the centrifugal defoaming machine, and the impeller inside the centrifugal defoaming machine allows The air is sucked in and mechanically crushed by the centrifugal force of the impeller to separate it into air and seawater. Since it returns to the flow of the above, it is possible to effectively collect and defoam bubbles floating on the water surface of the discharge channel without increasing the facility cost and operating cost.

Further, since the three-dimensional net is floated and held by the rod-shaped float, it is not necessary to adjust the height position of the raft due to the fluctuation of the tide level.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a device for removing floating bubbles in a discharge channel according to the present invention.

FIG. 2 is a vertical sectional side view showing a usage state of the floating bubble removing apparatus.

FIG. 3 is a vertical sectional front view showing a usage state of the floating bubble removing apparatus.

[Explanation of symbols]

 1 Floating bubble removing device 2 3 dimensional net 3 Float 4 Edge plate 5 Centrifugal defoamer body 6 Vertical electric motor of centrifugal defoamer 7 Exhaust pipe of centrifugal defoamer

Claims (1)

[Scope of utility model registration request] 1. A semi-rigid string made of plastic or metal, which is made by arranging it in a fibrous fiber shape and in a thick and band shape.
The three-dimensional net and the rod-shaped float that floats and holds this three-dimensional net on the water surface are alternately arranged in parallel, the floats are positioned on both sides in the width direction, and the entire width is almost the same as the underdrain width. Then, the whole is assembled in a raft shape, an edge plate is attached to one end in the longitudinal direction of the raft, and a centrifugal defoaming machine is attached to the edge plate.