JPS593214B2 - Gas-liquid contact device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas-liquid contact device that disperses gas in a liquid to cause the gas to be absorbed into the liquid or to cause a reaction between the gas and the liquid. This invention relates to a vibrating gas-liquid contact device that increases the contact area between gas and liquid by dispersing them into fine bubbles.

Conventionally, in this type of gas-liquid contact device, a porous member is fixedly interposed in the gas path in the liquid to increase the contact between the gas and the liquid, and a large number of small bubbles are generated in the liquid. However, since this porous member has many small holes and is fixed to the liquid container, the thickness of the perforated plate is increased to withstand water pressure when gas pressure fluctuates, resulting in increased material and labor costs. It cannot be used in cases where crystals are formed due to contact between gas and liquid, and clogging occurs even in the case of slurry-like liquids.

The present invention aims to solve these problems,
By arranging a porous member that is connected to the container body through an elastic member and has a gas reservoir at the bottom in the gas path in the liquid, the influence of water pressure is removed, and the perforated plate itself is free from the gas accumulated at the bottom and from the holes. Buoyant forces are acting on both sides of the bubbles that are about to emerge, but these forces are constantly changing within a minute time due to the release of the bubbles and the supply of gas. Because of the bonding, the perforated plate itself vibrates and resonates, and the bubbles that try to leave the perforated plate are placed in an unstable state compared to a stationary perforated plate, so the generation of smaller bubbles is promoted. It is an object of the present invention to provide a gas-liquid contact device with good gas-liquid contact efficiency.

Next, the present invention will be explained based on a first embodiment shown in FIGS. 1 and 2.

The cylindrical liquid container 1 is a 500 mm diameter container made of transparent PVC, and has a gas supply port 2 at the bottom and a gas outlet 3 at the top.

Further, one end of an elastic support member 7 composed of a cylindrical bellows having a diameter of 50 mm is fixed to the bottom of the container 1, and the other end is connected to the perforated plate 4.

The perforated plate 4 is made of stainless steel with a thickness of 1 mm and a diameter of 400 mm, and the holes of 2 mm diameter have an opening ratio (total area of one hole/disk area).
It is evenly spaced so that the ratio is 0.1.

Further, a skirt 5 with a height of 50 mg is attached around the perforated plate 4 in order to form a gas reservoir 6.

Water 521 was charged into the container 1 of this apparatus, and air was supplied through the gas supply pipe 2 at a rate of 9 to 25 m''/H.

The perforated plate 4 vibrates at a frequency of 5 to 15 Hz when the bubble diameter was measured, and the average bubble diameter was 3 mr from the holes of the perforated plate 4.
Bubbles of nφ are generated and come into contact with the liquid.

Therefore, according to this device, since the perforated plate 4 is immersed in the liquid, there is no influence of water pressure, and since vibrations are generated naturally, the gas-liquid contact effect is good.

Next, a specific example of an experiment conducted using this apparatus will be explained.

(1) An oxidation performance test of sodium sulfite (Na2S03) was conducted under the following conditions.

Aqueous solution amount 527 Initial Na2SO3 concentration 0.25 mol/l Oxidation catalyst CO3O41XIO-3 mol/l Supply air amount 9
m3/Hr As a result, the capacity coefficient KGa expressed by the following formula is 0.87
(Kg-mal/rri'hr ata).

Here, (Kmol/m'・hr) Po2: Average oxygen partial pressure [ata] On the other hand, when the elastic support member 7 of this device was replaced with an iron bar material and a similar oxidation test was conducted, Kga −
= 0.71 (KmoA/m”・hr a ta)
Therefore, the oxidation performance decreased to 82%, and it was found that supporting the porous plate with an elastic member contributed to improving the oxidation performance of the solution.

(2) A continuous oxidation test of a water slurry of CaSO3+CaSO4 was conducted under the following conditions.

Amount of aqueous solution 521 CaSO3 concentration 0.1moc/A' Ca54 concentration 0.9 mol/l! Supply air velocity: 977+''/Hr After about 20 hours of testing, an inspection was conducted, and it was found that there was no clogging of the perforated plate at all, and it was found that it could adequately handle slurry systems.

When the perforated plate was supported with iron rods, approximately 5% of the total number of holes in the perforated plate were found to be clogged after approximately 20 hours of operation under the above conditions.

Next, a description will be given based on a second embodiment shown in FIGS. 3 and 4.

In Figures 3 and 4, the perforated plate 4 is mounted in multiple stages with elastic support members 7, and the rest is the same as the first embodiment.
The explanation will be omitted here.

Next, an example of an experiment conducted using this device will be explained.

Width 10 mm and thickness 1 arranged at 60° intervals around the circumference of the perforated plate 4
50mm from the bottom of cylindrical container 1 using a rubber band between
An oxidation test of sodium sulfite was carried out under the same conditions as in Experimental Example (1) above, with the test tube mounted 150 mm above.

As a result, the capacity coefficient KGa was 0.95 (kg-mol)/m'hr ata), and it was found that the present device was effective in improving the oxidation performance of the solution.

[Brief explanation of drawings]

1 is a front sectional view of the first embodiment based on the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, FIG. 3 is a front sectional view of the second embodiment, and The figure is a view taken along the line BB in FIG. 3. 1...Container, 2...Gas supply port, 3.
... Gas outlet, 4 ... Perforated plate, 5 ...
...Skirt, 6...Gas pool, 7...
...Elastic support member.

Claims (1)

[Claims] 1. In a gas-liquid contact device equipped with a gas supply port and a gas discharge port at the bottom and top of a liquid container, respectively, the gas is connected to the container main body by an elastic member and connected to the gas path in the liquid in the main container, and the gas is connected to the bottom of the main container by an elastic member. A gas-liquid contact device characterized in that a porous member having a reservoir is provided.