JPH01500019A - Method and apparatus for introducing gas into a liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Method and apparatus for introducing gas into a liquid The present invention comprises a rotary paddle assembly having a shaft that rotates primarily in a horizontal direction, and which is submerged in a liquid. Relating to a method and apparatus for introducing gas into a liquid using a container, the paddle is Gas is introduced into the liquid from the gas present above.

According to EP-B OOO5553, devices suitable for this purpose are known; In the device, a scoop connected to a rotating shaft with spokes opens upwards, and It moves along the inner wall of a partially cylindrical container that is intended to contain liquid; A part of its trajectory passes through the gas space above the liquid. At the top of this orbit, the liquid comes out of the scoop. The gas flows through the liquid, thereby absorbing the gas, which is then scooped into the liquid. It escapes in the form of gas bubbles in the lower part of its orbit. This foam is removed from the scoop. Since it reaches the rear part, gas is prevented from escaping directly to the liquid surface. Gas liquid side The movement in the direction is rather slow, as the collected bubbles easily coalesce and form large gas This is because the contact area with the liquid becomes smaller. With such a device There is relatively little gas leakage.

The present invention provides a method and apparatus capable of injecting gas into a liquid. The purpose is

To achieve this objective 11, the method according to the invention allows the container to be partially filled with liquid. The paddle is driven at such a speed that the liquid is forced upward in a rotational manner, and its This is the part where the condensate spills downward and forms a hydraulic jump. It scatters and falls during the camp, thereby injecting gas into the liquid.

Scot f, which is moved by this water pump, injects gas into the liquid. dense gas bubbles The higher the temperature, the more gas remains in the liquid. Gas bubbles remain in the liquid due to the hydraulic jump. , which causes great irritation to the liquid.

This provides a wide interface between liquid and gas.

According to an experiment by tapping water to introduce air, it was found that 5000 mg/l, 500 mg/l or more, However, conventional equipment allows for much more. According to this, about 2 ．． Efficiency of 5 Yu/kWh of energy injection can be obtained.

In addition to injecting gas into a liquid, this method is also used to remove volatile components from the liquid. However, in that case, you must be careful that the gas escaping from the liquid is removed. This means that the volatile components are discharged separately from the gas supply.

Preferably, gas incorporation into the liquid is improved by applying pressure.

The present invention provides a complete apparatus for carrying out this method, which involves supplying and discharging liquids. a container disposed along the horizontal axis of the container, above the liquid and containing the gas in the container; It has a day wheel that allows gas to be injected into the liquid, and its features are as follows: When the four paddles of the day wheel drive the day wheel at the operating speed, the liquid is transferred to the first four paddles as the paddle rises. It is enough to push the liquid up to the highest point in the day, 10,000 times. The outer layer of liquid falling turbulently in the quadrant of I won't go in.

In particular, the wall of the device substantially covers the day wheel in at least said first quadrant. It is coaxial with the shaft and located just a short distance from the outer end of the paddle.

In this way the liquid is driven by the paddle to the highest point for optimum effect. optimal In operation, the gas space remains inside the paddle ring after pushing up the water. This determines the width of the paddle.

On the other hand, the width of the paddle is as large as possible in terms of liquid uplift and foam introduction. It's better.

NL-A 6508434, the venting device is known as it is, the tab, longitudinal axis It consists of a cylindrical container with a rotation axis of a paddle assembly oriented in the The liquid completely fills the container and rotates through the shaft into a spiral shape. Bubbles introduced in a bubble path are compared to vertical bubble paths in still water. Increased compared to This known device is more complex than the device of the invention. That is, The reason is that additional equipment is required to supply gas under pressure to the hollow shaft. .

Particularly in the case of the device according to the invention, at least in the second quadrant of the paddle movement. , close to the paddle trajectory to increase foam introduction and keep the hydraulic jump as small as possible. It is equipped with baffles or walls arranged in such a way that the

A baffle plate or perforated plate is provided between at least a portion of the paddles, thereby preventing the dragging. This has the effect of making the size of the gas bubbles smaller.

Additionally, the upper side of the container is cylindrical and has one or more gas supply holes therein. is clear, and they can communicate in the second quadrant of the paddle.

If the device according to the invention also aims to remove volatile components from liquids, the container In addition to the gas supply port, a gas discharge port must also be provided.

The invention will be explained in more detail below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of the device of the present invention in a resting state; FIG. 2 is a sectional view corresponding to FIG. 1 in an active state, and FIG. 3 is a second diagram according to another embodiment. A cross-sectional view corresponding to FIG. 4 is a side view of one device according to the invention.

The device shown in the drawing has a paddle inside which is arranged on the rotary shaft 3. It is a cylindrical container with a wheel, the rotation axis 3 of which extends over the longitudinal axis of the container 1. Ru. In the embodiment, the paddle 2 has an L-shaped portion and is supported by an arm or disc (not shown). and is connected to the shaft 3. In the resting state shown in FIG. 1, the container 1 is partially filled with liquid 4. When filled, a gas space 5 above the liquid communicates with one or more gas supply holes. I'm passing through. If the liquid 4 is to be vented under normal pressure, the holes 6 are connected to the atmosphere. Communicate.

If the shaft 3 rotates in the direction of the arrow 7 as shown in FIG. The speed follows you in eight directions upwards and pushes you up. The weight of the liquid pushes the liquid upwards. After falling, the so-called hydraulic jump 9 reaches the side wall of the container 1. form.

The liquid is stirred there and mixed with the gas from space 5, and paddle 2 is moved again in region 9. Entering the liquid, gas bubbles are introduced into the liquid from region 9 as indicated by arrow 10.

The gas bubbles escape again towards area 9 as shown by arrow 11 along with the swirling flow of the liquid, but The escaping gas bubbles violently stimulate the liquid in region 9.

Due to the mixing of gases, the level in region 9 is approximately the same as the level of the liquid under static conditions as shown in Figure 1. They are almost the same. The volume of the gas space is the liquid 8 pushed upwards and the liquid in the form of bubbles. The amount of gas taken in decreases considerably.

The larger the gas space 5 when the day wheel is at rest, the larger the portion 8 of the liquid pushed up and the larger the liquid 4. The amount of gas bubbles introduced into the tank increases. However, the gas space increases. This means that the amount of liquid is also reduced, so an optimal contact surface between gas and liquid can be obtained. There is a liquid level. Introducing a large number of gas bubbles can be achieved by reducing the amount of liquid. It's not.

The paddle 2 is moved in the direction of the axis 3 so that the liquid is sufficiently pushed up and sufficient gas bubbles are introduced. It extends by a distance. This width requires that the gas space be within the paddle 2 ring for optimal operation. limited by the requirement that it be within the group. The speed is too fast or the paddle is too uneven. Setting it too high will reduce the introduction of gas bubbles when the gas space is only between the paddles. do.

In order to reduce the size of gas bubbles that follow the liquid, as shown schematically in Figure 3, Perforated plates 12 can be provided between the paddles.

By reducing the size of the gas bubble, the interface between gas and liquid can be increased. It can be done, but then the stirring in region 9 will also be weaker due to the escaping gas. if If the gas bubbles are too small, the residence time of the small bubbles is too long. This kind of phenomenon depends on how the device is used.

FIG. 3 shows another embodiment of a container having a rectangular cross section. Its side wall 13 or corresponding An attached baffle forms a region 9 near the track of the paddle 2, and a bent baffle 14 Push your body up to the highest position 8.

As can be seen in Figure 4, container 1 is provided separately for ventilation and for distributing the air supply. A plurality of supply holes may be provided.

Motor 15 drives shaft 3 using suitable speed reduction means.

Connecting means (not shown) supply and discharge the liquid to be treated, and the supply and discharge are linked. If you want it to be a sequel, it will be done continuously. Overflow to maintain fluid level. Low baffles or other level control means are used.

Such devices can be used to aerate the water, e.g. to reduce the chemical oxygen demand (COD) of the water. It can be used for equipment for recording. When oxygen is introduced into a gas space instead of air, the amount of oxygen increases. can be increased 4 to 5 times.

The other device can remove volatile components from the liquid, but in this case, of course, the gas supply hole Apart from 6, a separate release hole is also necessary to release volatile components. becomes.

If with the introduction of gas into the liquid, in order to increase the pressure in the gas space 5 be able to.

In an experiment using this device, oxygen was introduced into tap water using container 1 with a diameter of 1 m. The oxygen introduction efficiency was 2.5 kg/kWh at s　Orng/l, h . This is a considerable improvement over conventional devices.

Gas introduction is also directly proportional to the length of the container l, and depends on the structure, the space provided, etc. limited only by. A plurality of containers can also be arranged in a row or in parallel.

Such devices can be thought of as low pressure centrifugal pumps. pushed upwards The behavior of the liquid can be compared to the collapse of a wave crest, with the core rushing downwards and causing a hydraulic jump. The overlying part collapses into the jump, releasing the gas into the liquid. Sink into it.

This device is suitable for aerating large water basins, for example, and container 1 can be submerged in water. to the desired water level, place the water intake near the shaft 3 at one end of the container L, and the outlet at the other end of the container. By providing it near the periphery, a complete circulation flow can be generated.

When venting under normal pressure, the container l has one continuous hole 6 in free communication with the atmosphere. can be provided.

To define the hydraulic jump area 9, two day wheels 2 are arranged side by side in one container. It can also be obtained by driving the car oppositely to the adjacent jumper. forming dip regions and laterally limiting each other.

The baffle 13 is omitted, but a bent baffle 14 is used for each day wheel 2. Good.

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Claims (10)

[Claims] 1. a paddle assembly having an axis that rotates primarily in a horizontal direction, the paddle being above a liquid; using a container immersed in a liquid adapted to introduce gas into the liquid from a space A method of introducing gas into a liquid, the method comprising: said container (1) being partially filled with liquid; The paddle (2) is pushed upwards (8) as the liquid rotates, and then The covered part falls into the jump (9) and introduces gas into the liquid. A method for introducing a gas into a liquid, characterized in that the gas is driven at a certain speed. 2. Used to remove volatile components from a liquid, the gases escaping from the liquid become gas A method according to claim 1, characterized in that the liquid is discharged separately from the supply port. 3. Claim 1 or claim 1, wherein the gas is supplied under pressure. The method described in Section 2. 4. a container with a liquid supply inlet and an outlet; and a container provided along a horizontal axis of said container. and a paddle wheel for introducing gas into the liquid from a gas space located above the liquid surface. An apparatus for carrying out the method according to claims 1 to 3, which comprises: The width of the car's paddle (2) allows the liquid (4) to pass through the paddle (2) when driving the paddle car at the operating speed. is sufficient to push it into the first quadrant, which is moving upward towards its highest degree. On the other hand, the liquid layer descending in the next quadrant is caused by the flow of the paddle (2) moving downward in the latter quadrant. A device characterized in that it is formed so that it cannot enter the ring. 5. The wall (14) of the container (1) is substantially in contact with the paddle wheels (2, 3) in at least the first quadrant. 5. A device according to claim 4, characterized in that it is coaxial with the axis (3) of the device. 6. At least at the end of the next quadrant of the paddle following said first quadrant, the container (1) is placed on the paddle. characterized by having a puffle or wall (13) at a small distance from the orbit. 6. The apparatus according to claim 4 or 5. 7. A baffle plate or perforated plate (12) is provided between the paddle (2) and the shaft (3). An apparatus according to any one of claims 4 to 6, characterized in that: 8. At least the upper side of the container is cylindrical, in which said second part of the track of the paddle (2) Claim characterized by having one or more gas supply ports communicating with the quadrant Apparatus according to one of the ranges 4 to 7. 9. A separate gas supply port (6) is installed to remove volatile components from the liquid. According to any one of claims 4 to 8, the invention is characterized in that it is equipped with a gas discharge port. Equipment described. 10. Hydraulic jump with two paddle wheels rotating in opposite directions arranged in parallel inside container 1 Claims 4 to 4, characterized in that the regions (9) are adjacent to each other. 10. Apparatus according to any one of clauses 9.