JPS63156526A - Method and apparatus for mixing gas into liquid - Google Patents

Abstract

PURPOSE:To uniformly mix all volume of liquid with gas, by simultaneously injecting pressurized gas and liquid from the one side of a closed mass in which many water-resistant fine spheres having smooth surfaces and constant dimensions are closely assembled and ejecting them from the other side. CONSTITUTION:In this case, the injection of compressed gas and raw liquid into a main body 1 is performed by connecting the duct of a feed part 6 of raw liquid to a compressed air pipe 16 and discharging them to a diffusing and mixing chamber 2 through a common injection port 5 at a gas-liquid mixing state. Since air having about 5kg/cm<2> pressure may be ordinarily fed to the compressed air pipe 16, it can be fed from a compressor equipment kept in reserve. Raw liquid is sent under pressure to the T-pipe 14 of a compressed air path through the feed part 6 of raw liquid at about 6kg/cm<2> pressure by means of a pump variable in flow rate. The injection port 5 may be individually provided for gas and liquid but is designed so that they are easily mixed in the mixing chamber 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method and apparatus for mixing gas into a liquid.

<Prior art> Methods for mixing external gas into a liquid include foaming by stirring and blowing air into a fish tank. Alternatively, there is a foaming method in which sand is fed from one end of a cylinder and released from the other end.

<Problems to be Solved by the Invention> The above-mentioned foaming method is currently the most advanced method for mixing gas into a liquid. However, due to this foaming method, the gas (foams) mixed into the liquid (the diameter of the bubbles is at least 60 μm or more, and the sizes of the bubbles are mixed in size).

This indicates that the liquid and air are not mixed sufficiently or evenly. If the air were truly evenly mixed in, the bubbles would have smaller diameters and be evenly spaced.

The object of the present invention is to develop a mixing method and an apparatus for mixing the entire volume of liquid with gas evenly.

Means for Developing Problems] The method of mixing gas into liquid according to the present invention is to mix gas and liquid into a densely packed mass of water-resistant microspheres with smooth surfaces and constant dimensions from one side of the mass. It is characterized by being press-fitted at the same time and ejected from the other side.

Further, the mixing device of the present invention includes a cylindrical body whose inlet side end is closed and whose outlet side end is open, a pressurized gas and liquid injection port provided on the inlet side of the body, and an inlet side inside the body. A gas-liquid diffusion mixing chamber provided, a water-permeable mass consisting of a large number of water-resistant microspheres with a smooth surface and constant dimensions, which filled the outlet side space inside the main body, and the main body so as to maintain the cohesion of the microsphere lumps. It is characterized by comprising a partition screen attached to the.

Effect> Conventional foaming methods are based on the empirical rule that if liquid and air are sent through numerous holes or slits, they will form many bubbles.

Since this is sufficient as a foaming method, no further research seems to have been conducted.

The present inventors investigated conventional techniques for the purpose of precise mixing of gas and liquid, and as a result, the conventional foaming device using sand became a promising hint.

Research has shown that bubbles are not created by blowing out from small holes like soap bubbles, but are created during the mixing process of gas and liquid.
If the gas and liquid are mixed uniformly, it will become a group of minute and uniform bubbles,
The present invention was realized based on the important fact that if irregularly shaped sand is transformed into uniform spheres and aggregated, the gaps between the spheres become channels with ideal gas-liquid mixing properties.

In other words, when air or liquid is injected from one side of a densely packed cluster of water-resistant microspheres with a smooth surface and uniform dimensions, such as glass beads or resin beads, and is ejected from the other side, the liquid and gas are finely separated. While running through each spherical gap, narrow and wide gaps continue alternately, and because they communicate in multiple directions, liquids and gases that run together are compressed, diffused, refracted, divided,
Repeat the merge. The mixing action by diffusion and refraction, the gas subdivision action by compression and splitting, and the overall equalization action by splitting and merging progress, so that when a particle aggregate of an appropriate length comes out, the liquid is evenly mixed with gas. It becomes.

Because glass beads and other objects that are close to perfect spheres are brought together, the common path for liquid and gas regularly expands, contracts, and refracts, creating a calculable gas-liquid mixing effect. Moreover, the mixing action can be controlled by selecting the spherical size and nodule size.

Further, the device of the present invention has a cylindrical body covered with a partition net,
The outlet side of the body is filled with micro spherical aggregates, and the inlet side of the main body is provided with a gas and liquid simultaneous injection port and a gas-liquid diffusion mixing chamber.
When gas or liquid exits from a narrow injection port into a wide mixing chamber and diffuses, for example, the lower side is liquid and the upper side is only gas.
Such a biased situation can be avoided.

In addition, by changing the position of the partition screen provided on the main body and the amount of microspheres, the longitudinal dimension of the nodule can be easily changed, and the gas-liquid mixing process in the nodule can be adjusted to accommodate different conditions.

Microspheres can be mass-produced in various sizes, have smooth surfaces, and are water resistant, but glass and resin spheres easily satisfy these conditions and are therefore easy to implement.

The presence of the partition screen on the outlet side of the sphere conglomerate has little effect on the gas-containing liquid that passes through it and comes out.

<Embodiment> Fig. 1.2 shows the main parts of an embodiment of a foaming device to which the present invention is applied, and Fig. 3 shows the device installed on a concrete mixer for producing aerated concrete.

In Figure 1.2, the / is a cylindrical body, a microsphere,
A common injection port for the stock solution and gas, 6 is the stock solution supply part, 7 is the end plate on the inlet side, za is the porous end plate on the outlet side, tα is the blowing tube, ri is the porous partition plate, IO is the front and back of the sphere lump 3 Surrounding partition net, //
is an adjustment bolt, which has a porous partition plate 9 and a partition net 10 inside it.
The outlet side porous end plate t1 and the partition net IO inside thereof are tightened and fixed, thereby making it possible to adjust the length of the spherical mass 3. In addition, / is a leg, /3 is a valve, llI is a T pipe, / is a pressure gauge, 16 is a compressed air pipe, and / is a guide screw blade.

If the main body is cylindrical, its cross-sectional shape does not matter much, but if the main body is laid on its side and the foaming liquid is spouted horizontally, a guide screw blade 17 must be inserted as shown in Fig. 1, or It is desirable to have a flat cylindrical shape that is wide laterally to reduce the vertical difference due to gravity.

In Figure 1, since the main body lies on its side, a porous partition plate and R adjustment bolts are used to keep the spherical mass 3 together and to separate it from the gas-liquid diffusion mixing chamber. However, if the main body / is used vertically as shown in Fig. 3, the spherical lump 3 will be kept concentrated at the bottom of the main body l by gravity alone, so these are unnecessary.
Only the porous end plate j1 and the partition net 10 on the outlet side are required. Alternatively, the porous end plate t may be omitted, and the nodules 3 may be received by the partition net 10 and the crosspieces supporting the partition net 10.

In this case, the compressed gas and stock solution are injected into the main body 1 by connecting the pipe line of the stock solution supply section 6 to the compressed air pipe 6 and releasing the gas-liquid mixture from the common injection port 3 to the diffusion mixing chamber 1. are doing. Normally, it is sufficient to send air at a pressure of about 5 kl/all to the compressed air pipe/6, so it can be obtained from the air compressor equipment on hand. In this embodiment, the stock solution supply section 6 is supplied with a pressure of 6 to 9/cyll by a variable flow rate pump, and is supplied to the compressed air line Tr?
The stock solution was pumped to zq. Although the injection port air and liquid may be separated, the design is such that they can be easily mixed in the mixing chamber λ.

The pressure inside the diffusion mixing chamber is measured by a pressure gauge! It appears at r, but if its value is P, and if it becomes atmospheric IEE at the blowout pipe size α, then K4. 2: Constant A: Spherical nodule cross-section tank Cf: Friction coefficient of gas-liquid mixture L: Nodule length ρ: Same as above Density U: Same upstream speed Q: Same as above flow rate Diameter of micro sphere, nodule length L1 Required foaming ratio (foaming If the volume increase rate of the liquid due to .

The microspheres used in the example were glass beads (GB503M) with a diameter of 1.4 to 2.0 II m, a nodule length L of 400 m, a foaming ratio of 16 to 22, a pressure inside the mixing chamber of about 5 ky/di, and a main body. / is length 500mm
4B pipe (10011φ), bolt // is 16t11φ
, Partition net 10 is a double layer of 50 mesh.

The two stock solutions used in the experiment are shown below.

(A) (B) Subtotal 1
00kjl Subtotal 100kg (viscosity 500-
P) (Viscosity 200-Pn) The experimental results using the apparatus of the above embodiment are shown below.

The case using a conventional foaming device is also shown for reference, but the values are only the best results, and the bubble diameter and foaming ratio of the conventional device are not uniform compared to that of this invention.
It was unstable.

Next, when the thickness of the main body and the length L of the spherical lump of the above-mentioned embodiment device are changed, the case of blowing sideways as shown in Fig. 1 and the case of blowing out sideways as shown in Fig.
When blowing out downward as shown in the figure, when using the guide screw blade in a horizontal position, and when not using it.
FIG. 4 shows the relationship between the square of the flow velocity U and the foaming ratio, and FIG. 5 shows the relationship between the stock solution flow rate and the foaming ratio. Only in Fig. 4 are the angles of the gauges,
I have added a circle to explain it, but ``No screw'' means ``No screw'' in the normal case where there is no screw blade/7 gold in the above-mentioned baby boom 3.
``With screw'' indicates when the screw is inserted, and ``Horizontal'' and ``Vertical'' indicate whether the main body is facing sideways or downward. The main body diameter is 4B.

6B is applicable when a 4-inch tube or 6-inch tube is used as the main body, and the number is 100. 150. The writing 200 means the length of the baby boom L = 40, which is the example dimension in Fig. 1.
Only if the length is other than 0 mm, the length il
Indicates m.

Considering the influence of each condition on the bubbles through experiments, (α) The diameter d of the microsphere is related to the state (size, strength) of the bubbles.

(A) The length L of the spherical mass has a necessary minimum length depending on d and the filling method, and the maximum length is determined by the pressure P.

(C) The optimum value of the flow rate U seems to be determined by various conditions including the pressure P, but it is unlikely to be within a certain range.

The precautions to be taken when using the above device are as follows.

(1) The liquid pressure and gas pressure shall be the same.

(2) Keep the discharge amount of the liquid pressure pump constant.

(3) Gas is delivered 15 times more than liquid, and that much piping is required.

(4) It is best to spray the main body downward, but if you want to spray sideways, insert a guide screw blade into the spherical mass so that the liquid or gas flows in a spiral direction toward the exit, and the upper and lower bubbles Prevents diameter differences.

(5) Since the amount of stock solution processed is fixed by the values of d, D, and L mentioned above, let's use d, D, and L as standards to find the range of pressure P that produces good foam by testing. Although an embodiment in which the invention is applied to a foaming device has been described, the application of the invention is not limited to this, and is effective in various applications that require precision mixing in which gas is fed evenly into contact with the entire amount of liquid. It is. Depending on the implementation conditions, and within the scope of the gist of this invention, various changes and applications can be made using techniques known to those skilled in the art. Naturally, the size adjustment means, the shape of the cylindrical body, the supply of liquid and gas, the adjustment means, etc. will vary depending on the purpose of implementation.

<Effects of the Invention> This invention has demonstrated that precise mixing of liquid and gas is possible using an extremely simple method and device in which liquid and gas are pressurized from one side of a microsphere aggregate and ejected from the other side.

A densely packed mass of homogeneous microspheres most easily distributes the interstitial passages with the most precise dimensions. It disperses the injected liquid and gas into countless spherical gaps and runs them.
During this time, it becomes an ideal gas-liquid mixing passage that has a mixing effect by diffusion and refraction, a gas subdivision effect by compression and splitting, and an equalizing effect by splitting and merging. Moreover, this intricate yet well-organized gas-liquid mixing path becomes a function of the microsphere diameter, which is convenient for future research and calculations.

Furthermore, since the device of the present invention provides a dense cluster of two microspheres with a partition net on the internal outlet side of the cylindrical body, it is possible to replace the spheres, adjust the lid, or clean it depending on the purpose of implementation. It is easy to The device is operated simply by adjusting the supply pressure of liquid and gas, so it is the simplest mixing and stirring device and is easy to maintain.

Since the main body inlet side has a liquid and gas injection port and a mixing chamber where gas and liquid diffusion mixing is performed, the gas and liquid are premixed before entering the spherical nodule, and the mixing degree is even within the nodule. Reduce the burden of oxidation.

This invention makes it possible to mix gas into liquid with extreme precision and to do so with a simple device, making a considerable contribution to the improvement of related technology in this field.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an apparatus according to one embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is an explanatory diagram of the usage situation of another embodiment, and Fig. 4
The figure is a diagram showing the relationship between flow rate and foaming ratio obtained under different experimental conditions, and FIG. 5 is a diagram showing the relationship between stock solution flow rate and foaming ratio. /...Cylindrical body, C...Gas-liquid diffusion mixing chamber, 3...
Microscopic spherical masses! ...Injection port, 10...Partition net. El (t. Celebrating the illusion, Hajime Futoshi - Page 1

Claims (2)

[Claims] (1) Gas to liquid characterized by simultaneously injecting pressurized gas or liquid from one side of a lump made of a large number of water-resistant microspheres with a smooth surface and constant dimensions, and ejecting it from the other side. Method of mixing. (2) A cylindrical body with the inlet end closed and the outlet end open; a pressurized gas and liquid injection port provided on the inlet side of the main body; and a gas-liquid diffusion provided on the inlet side inside the main body. a mixing chamber, a water-permeable mass consisting of a large number of water-resistant microspheres with a smooth surface and constant dimensions, which fills the outlet side space inside the main body, and a partition net attached to the main body to keep the microsphere clusters together. A device for mixing gas into a liquid, comprising: