CN107176641A - A kind of spiral-flow type defoaming device - Google Patents

Abstract

A swirling flow defoaming device, characterized in that the swirling flow defoaming device includes a swirling flow defoaming body, and the swirling flow defoaming defoaming body is provided with a tangential direction guide to enter the swirling flow defoaming defoaming body The inflow port in the body, the swirl defoaming body is provided with a foam collecting body, and the foam collecting body is equipped with a brush defoamer driven by power. The swirling flow defoaming device has a reasonable structural design and obvious defoaming effect. It drives the foam to gather in the foam collection body through the swirling centrifugal force of the guided foam water body in the swirling flow defoaming body, and the mechanically driven brush defoaming agent Enables efficient defoaming at low cost. The swirling flow defoaming device has simple structure and low operating cost, and can be widely used in defoaming operations of power plants using surface water bodies for refrigeration cycles.

Description

A swirl type defoaming device

technical field

The invention belongs to the defoaming technology of water bodies, and in particular relates to a swirl type defoaming device for mechanical cooling of water bodies in power plants.

Background technique

Thermal power or nuclear power plants generally adopt a once-through water supply system that uses surface water such as seawater as a cooling water source, which will inevitably lead to a large amount of circulating cooling water being redischarged into the environmental water body. In order to reduce operating costs and ensure the safe operation of the water intake and drainage system, under normal circumstances, power plant drainage adopts a siphon well outflow method, that is, a siphon well is provided at the front edge of the drainage outlet, and a certain elevation weir is installed inside the siphon well to reduce the tide level in the open sea. The impact of the change on the upstream section of the siphon well. In view of the constant change of the tidal level in the open sea, there must be a certain water level difference between the upstream water surface of the siphon well weir and the open sea surface, resulting in the discharge of the siphon well often falling out of the flow. There are a lot of air bubbles in the water body behind the well weir. At the same time, in order to eliminate the attachment of aquatic organisms to the intake and drainage structures of the circulating water and the blockage of the flow channel, chlorine or other chemical substances are generally used in the circulating water system to kill marine organisms. Influenced by substances and chemicals added to the water, the physical properties of the receiving water are changed, and the foam in the drainage is not suitable for collapse. After these large amounts of light yellow foam are discharged into the environmental sea area with the cooling water, they are scattered around under the action of ocean currents, etc., which not only seriously affects the water quality and appearance of the receiving water area, but also the splashed salty mist will seriously corrode the metal near the drain. Structures and vegetation on the ground. In some special cases, the foam may also overflow into the plant area, seriously affecting the environment around the power plant.

The existing coastal power plants have adopted certain energy dissipation and defoaming measures, but it is difficult to adapt to the needs of tide level changes. Under the condition of low tide level, the drainage water is easy to be aerated and carried to the open sea, forming a foam pollution zone; the second is that the existing projects The measures cannot completely prevent the generation of foam. Basically, measures such as foam blocking walls are used to contain the foam in the area behind the siphon well weir. The area behind the weir gradually accumulates foam, which is prone to foam overflowing the siphon well and polluting the factory area. Further engineering measures are needed to suppress it Foam builds up. In short, the existing engineering measures cannot fully meet the needs of drainage and anti-foaming in sea area projects. To explore more suitable drainage anti-foaming and anti-foaming methods for coastal power plants will help eliminate or reduce the impact of foam on the environment and improve the surrounding waters of power plants. Environment matters.

Contents of the invention

The invention provides a swirling flow defoaming device with reasonable structural design and obvious defoaming effect, which drives the foam to gather in the foam collection body through the swirling centrifugal force of guiding the water body with foam in the swirling flow diversion defoaming body, mechanically drives The brush defoamer can carry out the efficient defoaming operation at low cost. The swirl type defoaming device has simple structure and low operating cost, and can be widely used in defoaming operations of power plants using surface water bodies for refrigeration cycles.

The technical scheme adopted in the present invention is as follows:

A swirling flow defoaming device, characterized in that the swirling flow defoaming device includes a swirling flow defoaming body, and the swirling flow defoaming defoaming body is provided with a tangential direction to guide the flow into the swirling flow defoaming defoaming body The inflow port in the body, the swirl diversion defoaming body is provided with a foam collector, and the foam collector is equipped with a brush defoamer driven by power.

Specifically, the swirl diversion defoaming body is a drum structure, and the outer wall of the swirl diversion defoamer is also provided with a water outlet, and the water outlet is along the outer wall of the swirl diversion defoamer. The tangential direction is set, and the horizontal position of the water outlet is lower than the inflow.

In one embodiment, the water outlet is provided with a restrictor valve for restricting the flow of the water.

In one embodiment, the foam collector is a circular cylinder, and the circular cylinder is erected on the swirl flow diversion defoaming body, and the foam collector and the swirl flow diversion defoamer are arranged concentrically .

In another embodiment, the lower part of the foam collector is located above the lowest water level, and foam inlet gaps are distributed on the lower edge of the foam collector.

In yet another embodiment, an oblique baffle at a certain angle to the flow direction of the foamed water body is added on the outside of the foam entry gap.

In yet another embodiment, the center frame of the foam collecting body is provided with a brush bar which is rotatably arranged around the center, and the brush bar is rotated by a motor and simultaneously driven by itself.

The swirling flow defoaming device adopts a concentric sleeve structure design, and the swirling flow diversion defoaming body adopts a drum structure, which makes the incoming water flow through the inflow port of the tangential flow diversion and the barrel wall of the swirling flow diversion defoaming body. The water body with foam generates swirl flow power, and the centrifugal force generated by the swirl flow makes the foam gather toward the center of the swirl flow diversion defoaming body. The water body outlet set on the swirling flow diversion defoaming body in the leading position removes the water body after centrifugal separation of the foam, and the water flow outlet is provided with a flow limiting valve to limit the flow of the water body to control the change of the liquid level and keep the foam from gathering. Effect. The foam collecting body arranged concentrically with the swirl defoaming body is also a circular cylinder, and its lower edge is distributed with foam entry gaps above the liquid level, which can effectively promote the accumulation of foam. An oblique baffle at a certain angle to the flow direction of the foamed water body is added on the outside of the foam entry gap, which can block the foam outside the gap and guide it to gather in the foam collector. The brush bar rotated around the center is densely covered with needle-shaped brushes, and through mechanical driving, the brushes on the brush bar can contact the foam on the upper part of the foam collector and pierce the foam wall, thereby achieving an effective defoaming effect .

The beneficial effect of the present invention is that the structural design of the swirl type defoaming device is reasonable, and the defoaming effect is obvious. Driven brush defoamers provide efficient defoaming at low cost. The swirl type defoaming device has simple structure and low operating cost, and can be widely used in defoaming operations of power plants using surface water bodies for refrigeration cycles.

The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the swirling flow defoaming device of the present invention.

detailed description

As shown in Figure 1, the swirl defoaming device mainly consists of a swirl defoamer 10, a foam collector 20 and a brush defoamer, the swirl defoamer 10 is a drum structure, the The swirl diversion defoaming body is equipped with an inflow port 10 for tangential direction diversion into the swirl diversion defoaming body, and the inflow port 10 for tangential direction diversion and the barrel wall of the swirl diversion defoamer make the incoming foam The water body generates swirl flow power, and the centrifugal force generated by the swirl flow makes the foam gather toward the center of the swirl flow diversion defoaming body. The outer wall of the swirl diversion defoaming body is also provided with a water outlet 12, the water outlet 12 is arranged along the tangential direction of the swirl diversion defoamer outer wall, and the horizontal position of the water outlet 12 is lower than that of the flow. The inlet 11 and the water outlet 12 allow the water after centrifugation to separate the foam to flow out. The water flow outlet 12 may be provided with a water flow limiting valve for adjusting the liquid level in the swirl diversion defoaming body 10 . The foam collecting body 20 is concentrically arranged in the swirling flow defoaming body. The foam collecting body 20 is a circular cylinder, which is arranged on the swirl defoaming body through the fixed rod frame 21, and the bottom of the foam collecting body 20 is positioned above the minimum water level, and the foam collecting body The lower edge distribution of the collective opens the foam into the notch 22 . An oblique baffle plate 23 that forms a certain angle with the flow direction of the water body with foam is added on the outside of the foam entry gap. The foam collector is equipped with a power-driven brush defoamer. The brush defoamer includes a brush rod 31 horizontally rotatable around the center on the fixed rod 21 located on the central frame of the foam collection body. The brush rod is rotated by a motor 32 and simultaneously driven by itself.

Claims (7)

1. A swirl type defoamer, characterized in that said swirl type defoamer comprises a swirl defoaming body, and the swirl defoamer is provided with a tangential direction guide outside the swirl defoamer to enter the swirl defoamer The inflow port in the defoaming body is provided with a foam collecting body in the swirling flow guiding defoaming body, and a power-driven brush defoaming device is equipped on the foam collecting body. 2. The swirl type defoaming device according to claim 1, characterized in that the swirl diversion defoamer is a drum structure, and the outer wall of the swirl diversion defoamer is also provided with a water outlet , the water outlet is arranged along the direction of the tangent to the outer wall of the swirl diversion defoamer, and the horizontal position of the water outlet is lower than the inflow. 3. The swirling flow defoaming device according to claim 2, characterized in that the water outlet is provided with a restrictor valve for restricting the flow of the water. 4. The swirling flow defoaming device according to claim 1, wherein the foam collecting body is a circular cylinder, and the circular cylinder is erected on the swirling flow defoaming body, so that The foam collecting body and the swirl diversion defoaming body are arranged concentrically. 5. The swirling flow defoaming device according to claim 4, characterized in that the lower part of the foam collector is located above the lowest water level, and the lower edge of the foam collector is distributed with foam entry gaps. 6. The swirl-type defoaming device according to claim 5, characterized in that an oblique baffle at a certain angle to the flow direction of the foamed water body is additionally provided on the outside of the foam entry gap. 7. The swirling flow defoaming device according to claim 1, characterized in that the center of the foam collecting body is provided with a brush bar which is rotated around the center, and the brush bar is rotated by a motor and rotates at the same time drive.