JP2011183328A - Aerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To atomize aerated bubbles and enlarge oxygen use efficiency per energy consumption in an aerator arranged with an air lift pump. <P>SOLUTION: The aerator is constructed by communicating and connecting a bubble atomizing means having a liquid conducting means, a flow rate increasing means, a turbulent flow means, and a static pressure increasing means to the liquid discharge side or liquid inflow side of the air lift pump. By constructing the aerator in such a way, a multiphase flow of a gas of air or oxygen supplied to the air lift pump and a sucked liquid rises to generate a pumping force. The multiphase flow flows into the following liquid conducting means, and bubbles are atomized by a shearing force and cavitation in the flow rate increasing means and turbulent flow means on the downstream side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

In the present invention, a blower or a compressor or the like is provided with a diffuser for supplying pressurized air or oxygen gas, a liquid inlet is opened toward the bottom of the liquid storage tank, and a liquid outlet is opened in the liquid level direction. Then, a bubble refining means having a water guiding means, a flow speed increasing means, a turbulent flow means, and a bubble refining means is connected to the liquid discharge port or liquid inlet of the cylinder (hereinafter referred to as air lift pump) immersed in the liquid The present invention relates to an aeration apparatus.

  Conventionally, various aeration devices that can generate large and small bubbles in a liquid by mixing gas in various liquids used according to, for example, fresh water, seawater, wastewater, etc. In general, a blower or compressor is used for supplying aeration air or oxygen gas to a diffuser tube, which is a large number of small holes immersed in the liquid, and aeration, or a blower or compressor For example, a pressurized air fork is provided with a diffuser for supplying oxygen gas and a liquid inlet is opened toward the bottom of the liquid storage tank for aeration. What is aerated by aeration of bubbles has been put to practical use.

  If it sees by the prior art literature currently disclosed, the stirring body will be arrange | positioned in the middle of the pumping pipe of an air lift pump, and it is set as the aeration apparatus (patent document 1).

  In addition, an aeration apparatus in which an ejection nozzle of an air lift pump is disposed in an air reservoir chamber to prevent the nozzle from being clogged with a solid material (Patent Document 2).

Further, an orifice-like flow path is formed in the middle of the liquid flow path by making the inner diameter of the upstream liquid flow path smaller than the inner diameter of the upstream liquid flow path, and a gap with an air supply chamber disposed on the outer periphery is formed. Air bubbles are self-priming and jetted by generating a negative pressure due to a decrease in the liquid flow velocity to provide a bubble generating device (Patent Document 3).

Moreover, a gas-liquid two-phase flow is collided with a plurality of collision bodies to form a fine bubble generator (Patent Document 4).

Further, fine bubbles are generated by giving a swirl flow to the gas-liquid two-phase flow and ejecting the gas-liquid mixed fluid from a number of gas-liquid ejection holes (Patent Document 5).

JP2005-211738 JP 2008-132464 A JP2008-6215 JP 2009-101263 A JP 2008-279351 A

However, the conventional air diffuser has a problem that the oxygen utilization rate per supply energy is small.

Also, the air generated by the ascending force due to the density difference between the density of the gas-liquid mixture in the pumping pipe and the density of the liquid outside the pumping pipe generated by supplying air or oxygen gas into the pumping pipe of the air lift pump. No means for generating fine bubbles by changing the flow velocity of the liquid two-phase flow has been disclosed.

Further, no means for directly supplying oxygen with the energy itself for driving the fine bubble generating means has been disclosed.

Moreover, the knowledge which adjusts the magnitude | size of the bubble of an air lift pump as needed was not disclosed.

Moreover, the knowledge of disposing the surface aeration means above the aeration apparatus in which the air lift pump and the fine bubble generating means are connected in communication has not been disclosed.

    Therefore, the first object of the present invention is to refine the jet rising bubbles of the air lift pump by the flow velocity changing means. Another object of the present invention is to make the atmosphere or oxygen self-absorbed and refined by the flow velocity changing means by the air rising pump's jet rising bubbles. A third problem is to increase oxygen utilization efficiency per unit consumed energy by supplying oxygen with energy for driving the fine bubble generating means. Another object of the present invention is to cause surface aeration further above the aeration apparatus in which the air lift pump and the fine bubble generating means are connected in communication.

In order to achieve the above object, the present invention has a technical configuration as described below. That is, a bubble refinement unit having a water guide unit, a flow rate increasing unit, a turbulent unit, and a flow rate decreasing unit is connected to the liquid discharge side of the air lift pump.

By configuring in this way, the multi-phase flow of the air fork supplied to the air lift pump or the oxygen gas and the sucked liquid rises, and a pumping force is generated. Next, the air flows into the water guiding means, and the bubbles are refined by the breaking force and cavitation in the downstream flow velocity increasing means and the turbulent flow means.

As the flow velocity increasing means and the turbulent flow means, there are an orifice type, a venturi type, a swirl type, and the like, but a method that can effectively reduce the pressure drop to make fine bubbles is preferable.

As the air diffuser for supplying air fork or oxygen to the air lift pump, it is preferable to blow strongly with an injection nozzle or to blow with an air diffuser having as small bubble generating means as possible.

In addition, a water introduction means, a flow speed increasing means, a turbulent flow means, an air fork or an air bubble refining means having a turbulent flow / flow speed reducing means are connected in communication with the liquid suction side of the air lift pump.

With such a configuration, the air fork supplied to the air lift pump or the mixed phase flow of oxygen gas and the sucked liquid rises, and a pumping force is generated. Therefore, the liquid flows into the water guiding means communicating with the upstream side of the air lift pump, and then the air fork or oxygen gas is supplied to the downstream flow velocity increasing means and the turbulent flow / flow velocity decreasing means. When supplied by the supply means, the supply air or oxygen gas is refined.

Then, a large number of perforated shielding plates are disposed below the liquid level above the aeration means.

By configuring in this way, part of the gas-liquid two-phase flow is released to the upper water surface, and the remaining part is swirled downward in the horizontal direction, thereby providing a surface aeration means and extending the bubble and liquid contact time. And oxygen transfer efficiency increasing means.

As the flow velocity increasing means and the turbulent flow means, there are a venturi type, an orifice type, a swirl type, etc., but a system that can effectively reduce the pressure drop to make fine bubbles is preferable.

  Since the present invention is configured as described above, the following effects can be obtained.

In addition, the pumping force increases the multiphase flow of the air fork or oxygen supplied to the air lift pump and the sucked liquid rather than aeration with pressure water and the air forcibly sucking oxygen into the air bubbles. If the aeration is performed with finer bubbles, the amount of oxygen supplied per energy used increases.

In addition, the smaller the bubble diameter, the longer the gas-liquid contact time until the bubbles are released from the water surface and the larger the specific surface area, thereby increasing the solubility and reactivity of oxygen gas.

Further, since the oxygen gas reactivity is increased, the equipment capacity of the aerobic biological treatment and chemical reaction treatment tank of the high-concentration wastewater can be reduced, so that the construction cost of the treatment facility can be reduced.

Moreover, the aerobic microorganism activity in wastewater treatment is improved by aeration with fine bubbles rather than aeration with large bubbles.

In addition, by arranging a large number of perforated shielding plates below the upper water surface of the aeration means, a part of the gas-liquid two-phase flow escapes to the upper water surface through the holes, and the gas-liquid collides violently on the water surface. Therefore, the dissolution efficiency of oxygen gas in the liquid increases. In addition, since the remaining part of the swirl flow is horizontally downward, the time during which the bubbles stay in the liquid is extended, so that the efficiency of dissolving oxygen gas in the liquid increases and the energy utilization efficiency increases. .

It is a schematic explanatory longitudinal cross-sectional view of the aeration apparatus which shows the 1st Example of 1st invention. It is a schematic explanatory longitudinal cross-sectional view of another type microbubble generator which shows the 1st Example of 1st invention. It is a schematic explanatory longitudinal cross-sectional view of the aeration apparatus which shows the 1st Example of 2nd invention. It is a schematic explanatory longitudinal cross-sectional view of the aeration apparatus which shows the 2nd Example of 2nd invention. It is a schematic explanatory longitudinal cross-sectional view of the aeration apparatus which shows the 1st Example of 3rd invention. It is a schematic explanatory longitudinal cross-sectional view of the aeration apparatus which shows the 1st Example of 4th invention.

  An embodiment of the present invention will be described with reference to FIGS.

  In the first embodiment of the first invention shown in FIG. 1, the air diffuser 3 for supplying the pressurized air from the blower 1A through the pressurized air tube 2A and diffusing the air is provided in the conical lower cylinder 5 of the air lift pump 4. The inflow end portion 10 of the bubble miniaturizing device 9 is connected to the outflow end portion 8 that is disposed in the outlet portion 8 and discharges the gas-liquid two-phase flow from the discharge port 7 of the upper cylindrical body 6. The bubble refining device 9 is provided with a conical flow guide portion 11 whose inner diameter gradually decreases toward the downstream side on the inflow side of the gas-liquid two-phase flow, and the inner diameter gradually increases toward the downstream side on the discharge side. The conical bubble miniaturization part 12 is connected in communication. Then, as an intermediate flow path between the flow guide portion 11 and the bubble refining portion 12, a speed increasing portion 14 having the same inner diameter with respect to the central axis X is connected to the constricted portion 13 of the flow guide portion 11. The aeration device 15 is arranged concentrically in series. Any type of air diffuser 3 can be used as the air diffuser 3 but it is preferable to generate bubbles as small as possible. As the bubble miniaturization apparatus 9, the Venturi type apparatus of this embodiment is preferable because it has a small energy loss and is difficult to block with a solid substance. Next, as the preferable type, an orifice type in which the orifice 16 shown in FIG. 2 is provided is also preferable for the same reason as the venturi type. In addition, a swirl flow type is not excluded, but the swirl type is not preferable because the energy loss is large and the solid matter is easily clogged. Further, any type is not excluded (the same applies to the embodiments of the invention below). In this embodiment, air is supplied by the blower 1, but oxygen gas can also be supplied (the same applies to the following embodiments of the invention).

In the first embodiment of the second invention shown in FIG. 3, a nozzle member having an inner diameter that is the same as the inner diameter of the constricted portion 13 continuously to the constricted portion 13 of the flow guiding portion 11 shown in FIG. 1. An air reservoir 19 is formed by disposing 17 in concentric series with respect to the central axis X and disposing an outer tube 18 outside the nozzle member 17. In addition, a pressurized air pipe 2B for supplying pressurized air from the blower 1B is connected to the outer pipe 18 and the flow path 20 of the nozzle member 17 and the air reservoir 19 are connected. Although only two places are shown, the gas-liquid two-phase flow is generated by the turbulent flow and the shearing force in the bubble refining section 12 by arranging the vent holes 21 arranged uniformly at four places over the entire circumference. In addition to the action of reducing the size of the bubbles, the compressed air of the blower 1B is supplied by the pressurized air pipe 2B and further turbulent flow is generated to provide the bubble refinement device 9 that contributes to the refinement of the bubbles. is doing.

In the second embodiment of the second invention shown in FIG. 4, the pressurized air pipe 2A for supplying the pressurized air from the blower 1A has a liquid near the connection pipe 22 to the air lift pump 4 when the blower is stopped. A check valve 23 is provided to prevent the air from flowing backward, and the air ejected from the air ejection nozzle 24 has an air reservoir chamber 25 composed of an outer cylinder 25a, an inner cylinder 25b, a top plate 25c and a liquid surface. After that, it is blown into the liquid level under the air ejection nozzle 24. The plurality of air ejection nozzles 24 include the air lift pump 4 to which air is supplied via a manifold pipe 26 arranged in an annular shape directly below the top plate 25c constituting the air reservoir chamber 25. An inflow end portion 10 of the bubble refiner 9 shown in FIG. 3 is connected to an outflow end portion 8 that flows out from the discharge port 7 of the inner cylinder 25b in the lift pump 4. Even when the air lift pump 4 is stopped, since air is accumulated in the sealed air reservoir 25, the rise in the level of the liquid to be processed is suppressed and the air ejection nozzle 24 is prevented from coming into contact with the liquid to be processed. I can do it. Various diffusers other than the present embodiment can be applied.

In the first embodiment of the third invention shown in FIG. 5, the diffuser 3 for supplying the pressurized air from the blower 1A through the pressurized air tube 2A and diffusing it is arranged in the lower cylinder 6 of the air lift pump 4. The gas-liquid two-phase flow is discharged from the discharge port 7 of the upper cylindrical body 6, and the outflow end portion 8 of the bubble refining device 9 shown in FIG.

In the first embodiment of the fourth invention shown in FIG. 6, a plurality of small aperture shielding plates are provided below the upper surface of the aeration apparatus 15 shown in FIG. 4 in the second embodiment of the first invention. 28, and when the gas-liquid two-phase upward flow of the aeration device 15 collides with the aperture shielding plate 28, a part of the gas-liquid two-phase upward flow is a plurality of the aperture shielding plates 28. Dissolved oxygen is supplied to the liquid by surface aeration on the surface of the water through a large number of holes 29, and the remainder of the gas-liquid two-phase upward flow becomes a swirl flow in an angle direction below the horizontal, and the gas-liquid two-phase upward flow The fine bubbles inside remain in the swirling flow, and the gas-liquid contact time is significantly increased, which contributes to the dissolution of oxygen in the liquid.

For the purpose of supplying oxygen to an anoxic water mass in an enclosed water area and supplying oxygen in aerobic wastewater treatment, an aeration apparatus having a large energy saving effect and high oxygen utilization efficiency can be provided.

1A, 1B Blower 2A, 2B Pressurized air pipe 3 Aeration pipe 4 Air lift pump 5 Lower cylinder body 6 Upper cylinder body 7 Discharge port 8, 27 Outflow end portion 9 Bubble refiner 10, 27 Inflow end portion 11 Conveyance portion 12 Bubble refinement section 13 Constriction section 14 Speed increase section 15 Aeration device 16 Orifice 17 Nozzle member 18 Outer pipe 19 Air reservoir 20 Flow path 21 Vent 22 Connection pipe 23 Check valve 24 Air ejection nozzle 25a Outer cylinder
25b Inner cylinder 25c Top plate 25 Air reservoir chamber 26 Manifold tube 28 Hole shield plate 29 Hole

Claims (5)

The pressurized air fork is provided with oxygen gas diffusing means, and the liquid inflow port is opened toward the bottom of the liquid storage tank, the liquid discharge port is opened in the liquid surface direction and immersed in the liquid. An aeration apparatus comprising: a bubble miniaturizing means having a water guiding means, a flow velocity increasing means, a turbulent flow means, and a bubble miniaturizing means. The pressurized air fork is provided with oxygen gas diffusing means, and the liquid inflow port is opened toward the bottom of the liquid storage tank, the liquid discharge port is opened in the liquid surface direction and immersed in the liquid. An aeration apparatus comprising: a water guiding means, a flow velocity increasing means, a turbulent flow means, a bubble refining means, and a pressurized air fork or oxygen bubble supplying means, and a bubble refining means in communication with each other. The pressurized air fork is provided with an oxygen gas diffuser, and the liquid inlet is opened toward the bottom of the liquid storage tank, the liquid outlet is opened in the liquid surface direction, and the liquid inlet of the cylinder is immersed in the liquid. An aeration apparatus comprising: a water guiding means, a flow velocity increasing means, a turbulent flow means, and a bubble refining means. The pressurized air fork is provided with an oxygen gas diffuser, and the liquid inlet is opened toward the bottom of the liquid storage tank, the liquid outlet is opened in the liquid surface direction, and the liquid inlet of the cylinder is immersed in the liquid. An aeration apparatus comprising: a water guiding means, a flow velocity increasing means, a turbulent flow means, a bubble refining means, and a pressurized air fork or oxygen bubble supplying means, and a bubble refining means in communication with each other. An aeration apparatus comprising: a bubble refining means having a plurality of small perforated shielding plates and an upward flow swirling at a lower angle than horizontal, below the upper liquid level of the bubble refining means.

Images