KR101191562B1 - System to decrease residual ozone gas and to increase dissolved ozone in the water - Google Patents

Abstract

According to the present invention, ozone injected into the induction pipe inside the dissolution tank is dissolved in raw water by stirring the centrifugal impeller, and the undissolved ozone is sucked into the induction pipe again and continuously circulated and agitated so as to dissolve efficiently. By reducing the amount of excess ozone and also to reduce the capacity of the ozone generator relates to a high-efficiency ozone dissolving device with less ozone.
According to the present invention,
While installing the centrifugal impeller rotated by the submersible pump in the inner center of the melting tank, the lower opening of the induction pipe is located above it,
A portion of the ozone injection pipe is installed in the upper opening of the induction pipe so that ozone from the ozone generator is introduced into the induction pipe through the ozone injection pipe,
The raw water from the outside through the raw water inlet pipe to the dissolution tank so that ozone is dissolved in the raw water and injected into the dissolution tank via the centrifugal impeller,
The ozone in which the ozone is dissolved is discharged to the outside through the lower ozone water discharge pipe of the dissolution tank, and the undissolved ozone rises above the water surface and is sucked back into the induction pipe (4) by the self-sufficiency caused by the rotation of the Ipeller. Characterized by being configured to dissolve.

Description

System to decrease residual ozone gas and to increase dissolved ozone in the water}

The present invention relates to a high-efficiency ozone dissolving device with less ozone, and more specifically, ozone and raw water injected into an induction pipe having a centrifugal impeller in a closed dissolution tank are suction-stirred together with the induction pipe by rotation of the centrifugal impeller. Undissolved ozone is floated to the surface around the induction pipe again, and re-suctioned into the induction pipe due to self-suction by the rotation of the centrifugal impeller so that the ozone and raw water can be efficiently circulated and stirred in the dissolution tank. The present invention relates to a high-efficiency ozone dissolving device with low ozone, which can reduce the amount of excess ozone and reduce the capacity of the ozone generator.

In general, ozone has the strongest oxidizing power after fluorine, so it is more powerful than chlorine in sterilization and can oxidize many organic / inorganic compounds and remove unpleasant tastes and odors.

The most important and frequently used process of ozone treatment is the contact of ozone gas with water. The ozone / air (or pure oxygen) compound produced by the ozone generator dissolves in contact with water under a certain temperature / pressure.

This process can have a significant impact on ozone treatment efficiency issues and equipment / operational costs, and its performance must be carefully determined and determined.

Ozone is a poorly soluble gas with low solubility in water. Solubility in water is based on Henry's law,

P = H * Cs ..................... (1)

Here, H is Henry's constant, P is ozone partial pressure, and Cs is saturation concentration in water, respectively.

It dissolves as follows, and the effect on temperature at normal pressure is generally expressed by the following equation.

Cw = 0.604 * (1 + T / 273) / (1 + 0.063 * T) .......... (2)

Here, Cw represents ozone concentration in water [mg / l], T represents water temperature (° C), and Y represents ozone concentration in gas [mg / l].

For example, if ozone gas of 20mg / l (ozone gas concentration is about 1% in gas) is introduced into water at 20 ℃, the concentration of ozone in water is about 5.7mg / l (5.7ppm). Actual ozone concentrations vary depending on the quality of the raw water.

Since the oxygen concentration in air is about 20%, Y becomes 20 times in Equation (2), but the solubility of ozone in water is about 9 mg / l (9ppm), which is only 1.5 times because of the equilibrium state of water. Is several times to tens of times higher than oxygen or air. (Venosa and Opatken said ozone has a solubility in water of 13 to 0 to 30 ° C of oxygen). This is an advantage that facilitates the use of ozone in water treatment.

However, the actual contact time between ozone and water is so short that reaching equilibrium is very difficult, so how quickly ozone dissolves in water is very important.

The water concentration Cw of ozone is a function of time T, and the dissolution rate can be expressed by the following equation.

dCw / dt = K * a * (C-Cw)

Where C is the ozone concentration at which the dissolution reaches equilibrium.

K is the total transfer (transfer) coefficient

a represents the total surface area of the interface where water and bubbles contact.

When the dissolution reaches equilibrium, the ozone concentration C becomes equal to the saturation concentration Cs, where Cs is the relationship between the gas concentration Cg and the following equation.

Cs = m * Cg (P / Po)

Where m is the distribution coefficient, Po is the gas pressure, and P is the ozone partial pressure, respectively.

Therefore, the maximum rate at which ozone dissolves in water is given by

dCw / dt = Ka * {m * (P / Po) * Cg-Cw} .......... (3)

The rate at which ozone dissolves in water (dCw / dt) increases the ozone concentration (Cg) in the bubble and increases the surface area of the interface where water and the bubble come in contact, that is, the diameter of the bubble as small as possible for the total The surface area (a) is increased, and the dissolution rate is increased when the ozone partial pressure (P) is increased or the injection speed is high, or when the injection point is deep. Therefore, by injecting the ozone gas deep into the water, the contact time between the bubbles and the water is long, and the partial pressure of the ozone gas is also increased, thereby increasing the dissolution rate.

In addition, the partition coefficient (m) is rapidly reduced to 0.37 at 10 ° C, 0.21 at 20 ° C, and 0.14 at 30 ° C as a function of temperature, and the dissolution rate is high at low temperatures.

Furthermore, in the gas-liquid flow process, mass transfer of low-solubility gas through the gas-liquid interface is characterized by diffusion of gas from viscous liquid to gas-liquid interface, material transfer from gas-liquid interface to liquid, etc. Receive continuous transfer resistance during material transfer.

Therefore, gas mass transfer is known to be influenced by several factors such as their resistance, the hydrodynamic properties of bubbles, temperature, composition and properties of solutions, and interfacial phenomena. Stagnant boundary membranes are difficult to maintain on the free surface of the agitated liquid, and there is no boundary layer of laminar flow due to turbulence in the gas-liquid flow process, so that eddy-cells are bubbled by turbulent energy. Pulverizes into large small bubbles and small bubble-eddies contribute significantly to mass transfer in the gas-liquid flow process.

Thus the way of the dissolution system. Various types of ozone dissolving devices have been developed to increase the solubility because contact time acts as an important variable, but the structure of the device is too complicated and the cost is too high. The method is used a lot. However, the solubility of ozone gas with ozone concentration of 1 ~ 2% is about 6 ~ 12mg / l (6 ~ 12ppm) at normal temperature and normal pressure, but the contact time between ozone and water is 20 ~ 30 Minutes are required, but even if the above-mentioned special circulation equipment is used in the dissolution tank, the ozone gas bubbles stay too short, such as 10-60 seconds, and most of them do not exceed 50% of the dissolution rate. Most of the undissolved ozone gas is emitted to the outside, causing a problem of excess ozone.

In other words, the general ozone dissolution method is 50% or less dissolution rate, especially the simplest diffuser (Diffuser) method is widely used, but the depth is only 10-30%. Therefore, a larger capacity ozone generator is needed, and many people recognize ozone water purification equipment as expensive equipment.

However, if ozone dissolving device with ozone dissolving rate of 60-80% or more can be made, one ozone generator is enough in one place where two or three ozone generators are needed. Therefore, ozone water purifier is not expensive equipment, so sterilization, deodorization, BOD, COD removal, green algae removal, More people can use ozone water purification equipment, which has many advantages, such as nontoxicity of toxic substances.

Accordingly, the present invention is to solve the conventional problems as described above, the ozone and raw water injected into the induction pipe with a centrifugal impeller in a sealed dissolution tank by suction and agitation together by the rotation of the centrifugal impeller to dissolve Undissolved ozone is again floated to the surface around the induction pipe, re-suctioned into the induction pipe by dissolution by the rotation of the centrifugal impeller so that the ozone and raw water are dissolved by continuous circulation and stirring in the dissolution tank. It is possible to reduce the amount of surplus ozone and to reduce the capacity of the ozone generator by continuously dissolving ozone and raw water through circulation and stirring in the dissolution tank to provide a high efficiency ozone dissolving device with low ozone. For that purpose.

High ozone dissolving device with less ozone of the present invention for achieving the above object,

Allow external raw water to flow into the raw water inlet pipe at the top of the sealed water tank,

Install a centrifugal impeller to rotate by an underwater pump in the inner center of the sealed melt water tank,

The lower opening of the induction pipe is located above the centrifugal impeller, and the upper opening is installed so that a part of the ozone injection pipe is locked into the induction pipe so that ozone from the ozone generator is injected into the induction pipe through the ozone injection pipe.

As ozone and raw water are sucked and stirred together with the induction pipe by the rotation of the centrifugal impeller, ozone is dissolved in raw water and injected into the dissolution tank through the centrifugal impeller to be discharged to the outside through the ozone water discharge pipe at the bottom of the dissolution tank. The ozone is not floated to the surface around the induction pipe again and re-suctioned into the induction pipe by self-suction by the rotation of the centrifugal impeller, characterized in that it is configured to be dissolved in raw water by continuous circulation and stirring.

In the high-efficiency ozone dissolving apparatus with less ozone according to the present invention, the raw water, the ozone gas and the gas on the upper surface of the dissolving tank are also sucked through the induction pipe by the rotation of the centrifugal impeller, and the centrifugal impeller is radial Since the raw water and ozone gas are mixed and sprayed in the (radial: perpendicular to the impeller rotation axis) direction, the raw water and the ozone gas are effectively mixed to maximize the dissolution efficiency.

In addition, the undissolved ozone gas is collected in the water around the induction pipe and sucked back into the induction pipe, so that circulation and agitation are continuously performed to maximize the dissolution rate and to reduce the ozone generator capacity by reducing the excess ozone.

Furthermore, the structure of the present invention is simple, the power consumption and occupied space is small, and the management is also simple and excellent in both performance and economics.

In addition, there has been a controversy over another pollution due to the residual problem of ozone, which is a disinfectant, but ozone has an effect of eliminating the debate of the harmful substance of the residual material since no harmful secondary by-products other than oxygen remain.

1 is a schematic diagram showing the concept of an ozone dissolving device according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing a state using an underwater motor according to an embodiment of the present invention.
Figure 3 is a schematic view of a state in which the dissolved water tank is installed in the interior of the water tank according to another embodiment of the present invention.
Figure 4 is a schematic diagram showing a state using a general motor according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2 illustrate the configuration of a high-efficiency ozone dissolving apparatus with low ozone according to an embodiment of the present invention.

In the center of the inside of the sealed dissolution tank 1, a centrifugal impeller 3 which is rotated by an underwater pump 2 is installed,

The lower opening of the induction pipe 4 is positioned above the centrifugal impeller 3 so that the raw water flowing through the induction pipe 4 is sealed into the sealed water tank 1 through the centrifugal impeller 3. To be sprayed,

A portion of the ozone injection pipe 6 is installed in the upper opening of the induction pipe 4 so that ozone generated from the ozone generator 5 is injected into the induction pipe 4 through the ozone injection pipe 6. ,

The raw water from the outside through the raw water inlet pipe (7) to the dissolved water tank (1),

Ozone water in which ozone is dissolved in raw water by the centrifugal impeller (3) is discharged to the outside through the lower ozone water discharge pipe (8) of the sealed dissolution tank (1) while the undissolved ozone floats on the surface of the centrifugal impeller It is configured to be sucked back into the induction pipe 4 together with the raw water and dissolved in the raw water by the magnetic attraction force by the rotation of (3).

The high-efficiency ozone dissolving device with less ozone of the present invention configured as described above,

While installing the centrifugal impeller (3) rotated by the submersible pump (2) in the inner center of the closed melt water tank (1), the lower opening of the induction pipe (4) is located above the centrifugal impeller (3) Raw water sucked through the induction pipe (4) is to be injected into the sealed dissolution tank (1) through the centrifugal impeller (3).

In addition, a portion of the ozone injection pipe 6 is installed in the upper opening of the induction pipe 4 so that ozone generated from the ozone generator 5 is injected into the induction pipe 4 through the ozone injection pipe 6. do.

In addition, the raw water inlet from the outside through the raw water inlet pipe (7) to the dissolved water tank (1).

Therefore, while the ozone generated by operating the ozone generator (5) is injected into the induction pipe (4) through the ozone injection pipe (6) while the raw water inflow from the outside through the raw water inlet pipe (7) Operation (2) causes the centrifugal impeller (3) to rotate.

As ozone and raw water flow into the induction pipe 4 at the same time by the rotation of the centrifugal impeller 3, ozone dissolved in ozone is discharged to the outside through the lower ozone water discharge pipe 8 of the sealed dissolution tank 1. To be discharged.

Ozone undissolved inside the sealed dissolution tank 1 floats on the surface of the water and is sucked back into the induction pipe 4 together with the raw water by the self-suction force caused by the rotation of the centrifugal inlet propeller 3 to be dissolved in the raw water. By maximizing the dissolution rate, the amount of excess ozone is reduced.

Therefore, the capacity of the ozone generator can be drastically reduced, the power consumption for the generation of the same ozone water is reduced, and the occupied space in which the ozone generator is installed can be significantly reduced.

3 is a view showing the configuration of a high-efficiency ozone dissolving device with less ozone in a state where a dissolution tank is installed in the tank according to another embodiment of the present invention.

The lower part of the lower part of the induction pipe 4 is located above the centrifugal impeller 3 while the centrifugal impeller 3 is installed at the inner center of the unsealed dissolution tank 1 by the submersible pump 2. The raw water flowing through the induction pipe (4) to be injected into the dissolution tank (1) through the centrifugal impeller (3).

In addition, the induction pipe 4 is connected to the water tank 10 at the upper end of the dissolution water tank 1 so that a part of the ozone injection pipe 6 is locked so that the ozone generated from the ozone generator 5 is the ozone injection pipe ( 6) to be injected into the guide tube (4).

Therefore, when the centrifugal impeller 3 is rotated by operating the submersible motor 2, the raw water of the water tank 10 and ozone injected through the ozone injection tube 6 are simultaneously introduced into the induction pipe 4 and the centrifugal impeller 3 is rotated. While stirring by the ozone is dissolved in the raw water to be sprayed into the dissolution tank (1), and the ozone dissolved water as much as the raw water sucked in the water tank (10) through the lower opening of the dissolution tank (10) ) And then sucked back into the induction pipe (4), so that circulation and stirring are continuously performed.

In addition, ozone that is not dissolved through the hole 9 formed in the induction pipe 4 located inside the upper end of the dissolution water tank 1 floats to the inner upper end of the dissolution water tank 1 so that the induction pipe ( 4) to be dissolved again while being sucked back into the hole of 4) to dissolve ozone in the raw water with high efficiency so that the dissolved ozone water is discharged through the ozone water outlet 11 of the water tank 10.

4 is a view showing the configuration of a high-efficiency ozone dissolving apparatus with less ozone according to another embodiment of the present invention,

The centrifugal impeller (3), which is connected to the shaft (22) and rotates, is located at the inner center of the sealed dissolution tank (1), which is installed outside.

The lower opening of the induction pipe 4 is positioned above the centrifugal impeller 3 so that the raw water flowing through the induction pipe 4 is sealed into the sealed water tank 1 through the centrifugal impeller 3. To be sprayed,

A portion of the ozone injection pipe 6 is installed in the upper opening of the induction pipe 4 so that ozone generated from the ozone generator 5 is introduced into the induction pipe 4 through the ozone injection pipe 6. ,

The raw water inlet from the outside through the raw water inlet pipe (7) to the dissolved water tank (1).

Ozone water in which ozone is dissolved in raw water by the centrifugal impeller (3) is discharged to the outside through the lower ozone water discharge pipe (8) of the sealed dissolution tank (1), while the undissolved ozone floats on the surface of the water and falls on the efeller ( The magnetic force by the rotation of 3) flows back into the induction pipe 4 together with the raw water to dissolve in the raw water.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the scope of the invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Melting tank 2: Submersible pump
3: centrifugal impeller 4: induction pipe
5: ozone generator 7: raw water inlet pipe
8: ozone water discharge pipe

Claims (3)

delete delete In the center of the inside of the sealed dissolution tank 1, a centrifugal impeller 3 which is rotated by an underwater pump 2 is installed,
The lower opening of the induction pipe 4 is positioned above the centrifugal impeller 3,
The upper opening of the induction pipe 4 is installed so that a part of the ozone injection pipe 6 coupled to the ozone generator 5 is locked,
Ozone water in which ozone is dissolved in raw water by the centrifugal impeller (3) is discharged to the outside through the lower ozone water discharge pipe (8) of the sealed dissolution tank (1), while the undissolved ozone floats on the surface of the water and falls on the efeller ( In the high-efficiency ozone dissolving device with less ozone which is sucked back into the induction pipe 4 together with the raw water flowing through the raw water inflow pipe 7 by the self-sorption force by the rotation of 3) and dissolved in raw water,
High efficiency with low ozone, characterized in that the centrifugal impeller (3) located in the inner center of the sealed dissolution tank (1) is connected to the general pump 21 installed on the outside by the shaft 22 to rotate together In ozone dissolving device,
High efficiency with low ozone, characterized in that the centrifugal impeller (3) located in the inner center of the sealed dissolution tank (1) is connected to the general pump 21 installed on the outside by the shaft 22 to rotate together Ozone dissolving device.

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