JP3107882B2 - Gas-liquid contact device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid contacting device for bringing a liquid and a gas into contact with each other to transfer components in the liquid to the gas, or for sterilizing the liquid with the gas.

[0002]

2. Description of the Related Art In the food industry, carbon dioxide gas is absorbed into water in the process of producing soft drinks such as carbonated water.
In the petrochemical industry, a liquid and a gas are brought into contact with each other by an oxidation reaction device, a hydrogenation reaction device, or a gas dilution water producing device. In the pulp and paper industry, a liquid and a sulfide gas are brought into contact with each other in order to carry out an absorption reaction of the sulfide gas. Environmental devices such as a deep aeration device, a water chlorine disinfection device, a waste gas treatment device, and an aerator also require a contact step between a liquid and a gas. Further, in fisheries, air is brought into contact with water to mix the air with the water in order to reinforce oxygen in the fish pond.

[0003] In particular, 1.1.1. Purification equipment for removing and purifying organic chlorinated compounds such as trichloroethane, trichloroethylene and tetrachlorethylene, and harmful substances for removing chlorine and trihalomethane, humic acid and other substances contained in tap water or well water, etc. This gas-liquid contact is performed with a removal device, a disinfection device for dissolving and enriching oxygen gas in raw water and sterilizing or sterilizing raw water with ozone, chlorine dioxide gas or chlorine gas, and a bioreactor using aerobic bacteria. The device is being used.

FIG. 10 is a schematic view showing a gas-liquid contact device using a conventional motionless mixer. As shown in this figure, in the conventional gas-liquid contact device, the raw water is supplied to a motionless mixer 1 through a liquid feed pump (not shown).
The compressed air is mixed with raw water to remove harmful substances such as organic solvents contained in the raw water by mass transfer to the air.

FIG. 11 is a schematic diagram showing a conventional underwater aeration device (static aerator). A motionless mixer 8 is immersed in a tank 6 in which water 7 is stored, and a pipe 9 is introduced below the mixer 8. Then, compressed air is supplied into the mixer 8 through the pipe 9. Then, as the air rises in the mixer 8, the water moves upward in the mixer 8 from the lower portion thereof, and a circulating flow of water is generated. This allows
Air and water are mixed in the mixer 8, and oxygen moves into the water.

[0006]

However, these conventional devices have the following disadvantages. First, FIG.
In the gas-liquid contact device shown in Fig. 0, the volume ratio of air to raw water is 3 to 6, and it is difficult to increase the ratio of air further. For this reason, the harmful substance removal efficiency is as small as 30 to 50% when the mixer is passed only once. Therefore, for example, in order to remove 90% or more of harmful substances in raw water, it is necessary to use 4 to 8 mixers. In this case, the same number of liquid feed pumps for feeding the raw water into the mixer 1 are required, which increases the cost of the apparatus.
Further, the pressure of the air to be pressure-fed into the mixer 1 needs to be substantially the same as the discharge pressure of the liquid-feeding pump, and power consumption is increased.

On the other hand, in the underwater aeration apparatus shown in FIG. 11, since the oxygen dissolution rate increases as the water depth increases, the mixer 8 is installed at a position 3 to 5 m from the water surface. For this reason, it is necessary to increase the discharge pressure of the blower that sends air into the mixer 8. Therefore, this blower requires a high-output motor and consumes a large amount of power.

Further, the water in the tank 8 is introduced into the mixer 8 by an air flow and is not forced to circulate in the mixer 8, so that the time required for aeration treatment is long.

The present invention has been made in view of such a problem, and has a low operating cost and a low apparatus cost.
It is an object of the present invention to provide a gas-liquid contact device having a low manufacturing cost and a high gas-liquid contact efficiency.

[0010]

Gas-liquid contact apparatus according to the present invention SUMMARY OF THE INVENTION may, liquid and gas in the tube axis direction a plurality of fluid passages flowing in spiral blade body in the passage pipe wall portion is arranged made form <br/> and arranged static fluid mixer the tube axis in the vertical, the lower connecting the lower end of the static fluid mixer
A case and an upper part connected to an upper end of the static fluid mixer
A case and a liquid higher than the liquid level in the upper case.
Before being supplied into the upper case by the hydrostatic pressure difference
A liquid <br/>-supplying means for flow through downwardly serial liquid in the static fluid mixer, the gas to flow through the gas upwards by supplying a gas into the lower case in the fluid mixer Supply means.

[0011]

In the present invention, since the liquid supply means forcibly introduces the liquid into the static mixer by the difference in hydrostatic pressure, a driving device such as a motor is not required, so that the operation cost and apparatus cost are low, and Since the fluid is forced to flow through the vessel, the contact efficiency is high.

[0012]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a gas-liquid contact device according to a first embodiment of the present invention. A cylindrical case 10 is provided in the lowermost gas supply unit.
The case 10 is provided with an outlet 12 for treated water. The end of a pipe 11 connected to an air supply source is inserted into the case 10, and the end of the pipe 11 has a plurality of air supply ports (not shown) directed toward the mixer 13. It is provided. The air is pumped into the mixer 13 via the pipe 11 by a pump or a compressor. At the upper part of the case 10, a motionless mixer (stationary fluid mixer) 13 of a gas-liquid mixing section is arranged with its fluid flowing direction vertical. The mixer 13 and the case 10 are in communication. FIG. 2 is a longitudinal sectional view showing one embodiment of the mixer 13 constituting the gas-liquid mixing section of the gas-liquid contact device of the present invention. 3 and 4 are cross-sectional views of the mixer 13 taken along lines AA and BB. As shown in FIG. 2, the mixer 13 has a plurality of spiral blades 19 and 20 joined to the inner wall surface of the passage tube 18. The blade body 19 is twisted 90 ° clockwise (clockwise). The wing body 20 is twisted 90 ° in a left-handed (counterclockwise) direction. Further, as shown in FIGS. 3 and 4, the mixer 13 has a plurality of fluid passages 25, 26, and a central portion in the mixer 13 has openings 22, 23 in a longitudinal direction with a fixed width, and Reference numerals 25 and 26 communicate with each other. Further, a space portion 21 is provided between the blade body 19 and the blade body 20 at a constant interval. Furthermore, the wing body 19 and the wing body 2
The 0 edge is arranged alternately at right angles with the space portion 21 interposed therebetween. The openings 22 and 23 may be straight or curved in the longitudinal direction. Further, the opening may have a tapered shape with a different cross-sectional area. The number of the blade bodies 19 and 20 in the same torsion direction is not limited to two, but may be one or two or more. Further, the mixer 13 may be configured such that the blades 19 and the blades 20 are continuously and alternately arranged adjacent to each other without providing the space portion 21 between the blades 19 and the blades 20. The twist angle of the blade bodies 19 and 20 can be set arbitrarily in addition to 90 °. Further, the number of the fluid passages 25 and 26 can be arbitrarily set. According to the present invention, when two or more types of fluids FA and FB flow into the mixer 13 in parallel, a part of the fluid rotates while rotating clockwise along the blade body 19 joined in the passage pipe 18. The fluid flows through the passage 25, merges at the space portion 21, and another part of the fluid undergoes a shearing action in the longitudinal direction of the opening 22 of the blade body 19.
Further, the merged fluids FA and FB are separated at the upstream edge of the blade body 20, and a part of the fluid flows through the fluid passage 26 while rotating counterclockwise along the blade body 20, and similarly. The opening 23 of the blade body 20 is subjected to a shearing action. As described above, the two or more kinds of fluids FA and FB are stirred and mixed with high efficiency in the mixer 13 while repeating division, confluence, rearrangement, and shearing action. The same effect can be obtained by mixing the fluids FA and FB in the mixer 13 in countercurrent. Further, in the manufacturing method of the present invention, first, the spiral blades 19 and 20 are joined to predetermined positions on the inner wall surfaces of the divided semi-cylindrical passage tubes 18a and 18b by means such as bonding and welding. Then, the semi-cylindrical passage pipes 18a and 18b are joined to each other at the dividing surface 24 by welding or the like. In this case, the divided surfaces 24 may be joined and fixed using means such as a fastener so as to be freely opened and closed without welding.
The blades 19 and 20 are easily manufactured by means such as forging, casting, and injection molding. In this way, a high-performance static fluid mixer 13 can be manufactured very easily. Further, the gas-liquid contact efficiency is improved by forming the blade body from a porous body or a porous body. The same effect can be obtained by providing a mesh-shaped porous auxiliary body on the inner wall portion of the passage tube 18 and the surfaces of the blade bodies 19 and 20.

The motionless mixer can be defined as a fluid passage structure that can mix fluids over a wide range of Reynolds numbers and has no mechanically movable parts, depending on the configuration of the fluid passage. Therefore, the static fluid mixer (motionless mixer) used in the present invention is:
As in the above embodiment, 90 ° right-rotating blade or 90 °
The left-rotating blade is not limited to those arranged in various modes. For example, a wing body rotating by 180 ° is arranged, or a metal plate is alternately rotated 90 ° or 180 ° to the right and left.
Various types of static fluid mixers, such as those having a structure in which twists and blades are continuous, can be used.

At the upper end of the mixer 13, a tank 14 of a gas-liquid separation section is arranged. The air flowing through the mixer 13 escapes above the tank 14, and the treated water after the gas-liquid contact treatment is discharged from the drain port 12 provided in the case 10.

A raw water tank 15 is disposed above a supply port (not shown) of the tank 14, and raw water to be treated is stored in the raw water tank 15. The raw water tank 15 and the tank 14 are connected by a pipe 16, and the raw water in the raw water tank 15 falls naturally and is supplied into the tank 14. Since the raw water tank 15 is located above the supply port of the tank 14, the water flows downward in the mixer 13 due to the hydrostatic pressure difference.

In the gas-liquid mixing apparatus thus configured, the raw water in the raw water tank 15 falls naturally into the tank 14 and is introduced into the mixer 13. Air is in the piping 11
Since the air supply port at the tip of the container faces upward, the air flows through the mixer 13 upward. Also, the raw water flows downward in the mixer 13 due to the difference in hydrostatic pressure. Then, the water and the air spirally rotate while flowing countercurrently downward and upward in the mixer 13 to repeatedly divide, merge and shear, and come into contact with high efficiency. Therefore, when the raw water contains a volatile substance, the raw water and the air come into intense contact with each other, so that the volatile substance in the raw water moves into the air and the raw water is purified.

In this embodiment, since the raw water flows through the mixer 13 due to the hydrostatic pressure difference, a driving source such as a pump is unnecessary. Therefore, the equipment cost is extremely low. Therefore, if necessary, it is easy to provide a large number of such mixers 13 in series to extend the processing time. Also, since the raw water is forced to flow through the mixer 13 due to the hydrostatic pressure difference, the raw water is reliably subjected to the purifying action by the air, and the processing efficiency is high.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and a detailed description thereof will be omitted. In the embodiment, two mixers 1 are provided between the case 10 and the tank 14.
3 are arranged in parallel, and the air supply port at the tip of the pipe 17 connected to the air source is arranged so as to match the lower end of each mixer 13.

In the gas-liquid contacting device configured as described above, the cross-sectional area through which the raw water flows increases twice as large as in FIG. 1, so that the processing time is shortened.

FIG. 6 is a diagram showing a first reference example of the present invention. In this reference example, raw water and air were mixed in a mixer 1
3 is introduced into the mixer 13 from the lower end. As described above, the same effect can be obtained even when the raw water and the air flow in the mixer 13 in parallel from the lower end part upward.

FIG. 7 is a diagram showing a second reference example of the present invention. As shown in this figure, a heating device 27 is provided so as to cover the mixer 13. As a result, the liquid and the gas are heated by the mixer 13, and when the mass transfer reaction is an endothermic reaction, this reaction is promoted. On the other hand, when the mass transfer reaction is an exothermic reaction, a cooling device may be provided instead of the heating device 27. Raw water and air heated or cooled outside may be supplied into the mixer 13.

By providing a far-infrared radiation device outside or inside the mixer 13 instead of the heating device, water can be activated. Further, by providing the magnetic field radiating device, the efficiency of water treatment by aerobic bacteria can be improved. Furthermore, by providing an ultraviolet radiation device, a sterilizing and sterilizing action can be obtained.
Free chlorine in water is decomposed and removed by ultraviolet rays.

FIG. 8 shows an embodiment in which three mixers 13 are vertically connected. A gas-liquid separator 28 is provided between the mixers 13. Raw water and water are mixed and contacted by the uppermost mixer 13 in the first stage, and substances (for example, volatile substances) in the raw water are mixed. The contaminated air moved into the air is separated and removed from the treated water by the gas-liquid separator 28a. The treated water is introduced into the lower second stage mixer 13, and at the same time, fresh air is introduced into the mixer 13 from the lower end of the second stage mixer 13. Similarly, the air contaminated by the gas-liquid separation device 28b is separated and removed. Further, the treated water and the fresh air are also supplied to the third lowermost mixer 13 of the third stage, and the treated water is purified by the air.

In this embodiment, the raw water undergoes the purifying action while fresh air is always supplied, so that the processing efficiency is high. Further, since the discharge pressure of the compressor or the like can be reduced, the operation cost is reduced.

FIG. 9 shows a configuration in which three mixers 13 are configured to introduce gas from the lower end and liquid from the upper end, and the liquid outlets at the lower end of the adjacent mixer 13 are moved up and down so that a hydrostatic pressure difference is generated. This is an embodiment in which the components are shifted. Also in this embodiment, in the mixer 13 of each stage,
Fresh air is always supplied and its purification efficiency is high.

Next, the results of actual gas-liquid contact treatment using the apparatus shown in FIG. 1 and the effect thereof will be described.

The mixer 13 has a plurality of blades each having an inner diameter of 100 mm and a length of 500 mm. The mixers 13 were arranged in five stages in series. Raw water containing 1000 ppm of 1.1.1 trichloroethane was supplied into the mixer 13 at a supply rate of 5 l / min, and compressed air was introduced into the mixer 13 at 100 liter / min. The ratio of raw water to air is 1 for raw water,
The air is between 10 and 30. As a result, about 40 to 60% of the trichloroethane in the raw water was transferred to the air in the single-stage mixer 13. Then, 90% or more of trichloroethane in the raw water was removed through the five-stage mixer 13.

The efficiency of removing organic chlorine compounds by 5 to 20% can be increased by adding ozone to air or raw water. Further, when ozone is injected and added to the volatile matter removing device in tap water, it is effective as a means for sterilizing and sterilizing the device.

Next, the result of applying the apparatus of the embodiment shown in FIG. 9 to the removal of volatile substances such as trihalomethane from tap water will be described. Inner diameter 100mm, length 600m
m with a motionless mixer of
Tap water containing ppm trihalomethane was supplied at a feed rate of 4 l / min, and compressed air was introduced into the mixer at a flow rate of 80 l / min. The ratio of this tap water to air is tap water 1
Air is 15 to 25. As a result, the trihalomethane in the tap water was removed by moving to about 50 to 80% air in the single-stage removal mixer. Then, 90% or more of the trihalomethane in the tap water was removed through the three-stage mixer.

Injecting and adding ozone into air mixed with raw water is effective as a means for sterilization and sterilization in the present apparatus.

The effect of removing the trihalomethane by the apparatus of this embodiment depends on the concentration of the trihalomethane contained in the raw tap water and the required removal rate (the concentration of the remaining trihalomethane after the treatment).
By increasing or decreasing the number of mixer stages, a desired one can be obtained. Further, the entire device can be downsized. Further, by disassembling, assembling, and connecting the mixers as a unit, it is preferable in terms of maintenance. It is to be noted that the throughput can be easily increased by increasing the diameter of the mixer or by disposing a plurality of mixers in parallel. When the gas-liquid contact device of the present invention is used as a bioreactor, the undiluted solution may be passed through a mixer 13 supporting microorganisms or immobilized enzymes. When aerobic cells are immobilized and used, air or oxygen may be passed through the mixer 13 together with the stock solution. Using this bioreactor,
When treating organic wastewater containing ammonia or the like, the ammonia or the like is efficiently decomposed by flowing the undiluted solution into a mixer 13 in which microorganisms such as nitrifying bacteria are carried on the wings 19 and 20. In this case, a gas such as air or oxygen is passed through the mixer 13 to activate the microorganisms. In the mixer 13, the microorganism and the stock solution and air or oxygen are sufficiently mixed and contacted, and the organic wastewater is efficiently and cleanly treated at low power cost. In the case where enzymes, microorganisms, animal and plant cells having biochemical catalysis are supported or fixed on the wings 19, 20, etc., the wings 19, 20 formed of a porous material or the like are manufactured in advance. It is also possible to adsorb the microorganism while immersing it in the existing microorganism, or to contact the microorganism with an auxiliary from the inoculation stage where the reaction starts, and to adsorb the microorganism as the culture proceeds. The passage tube 18 and the blades 19 and 20 are formed of a porous material or the like, and the passage tube 18 and the blades 19 and 20 are formed.
An enzyme, a microorganism, or the like may be supported or immobilized on 20.
In this case, the passage pipe is arranged in the pipe.

According to the present invention, there is no need for a power drive means for supplying and flowing the liquid into the static mixer, so that the operation cost is low. Further, since the mixer is easy to manufacture, the equipment cost is low. Further, since a driving source is not required, a large-scale device is not required, and the installation space may be narrow. Further, since the gas-liquid contact efficiency is high, the processing time can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of the mixer.

FIG. 3 is a sectional view of the mixer, taken along the line AA.

FIG. 4 is a sectional view of the mixer, taken along line BB.

FIG. 5 is a schematic diagram showing a second embodiment of the present invention.

FIG. 6 is a schematic diagram showing a first reference example of the present invention.

FIG. 7 is a schematic view showing a second reference example of the present invention.

FIG. 8 is a schematic diagram showing a third embodiment of the present invention.

FIG. 9 is a schematic diagram showing a fourth embodiment of the present invention.

FIG. 10 is a schematic diagram showing a conventional gas-liquid contact device.

FIG. 11 is a schematic view showing another conventional gas-liquid contact device.

Claims (3)

(57) [Claims] 1. A plurality of fluid passages liquids and gases in the tube axis direction spiral blade body in the passage pipe wall portion is disposed flowing is disposed vertically the tube axis direction is made form A static fluid mixer , coupled to a lower end of the static fluid mixer
Connected to the lower case and the upper end of the static fluid mixer
The upper case and the liquid level in the upper case.
From the higher position to the upper case due to the hydrostatic pressure difference.
Supply and flow the liquid downward in the static fluid mixer
A liquid supply means for causing a gas in the lower case supplied
Gas-liquid contact apparatus characterized by having a gas supply means for flow through the gas upwardly to within the fluid mixer. 2. The gas-liquid contact device according to claim 1, wherein the blade body is a porous body or a porous body. Wherein the static fluid mixer according to claim 1, characterized in that the enzyme or microorganism or animal cells, plant cells with a biochemical catalysis, and carries or immobilized
2. The gas-liquid contact device according to claim 1.