JPH0375146B2 - - Google Patents

Abstract

PURPOSE:To improve the reaction efficiency, etc., by dividing an aeration and agitation tank with perforated plates along axial direction, placing an inner cylinder to each of the partitioned chambers, and inserting a heat-transfer tube in the thermal medium tank formed between the inner cylinder and the outer wall of the tank, thereby connecting the heat-transfer tube to the partitioned chamber. CONSTITUTION:The liquid supplied to the tank 1 is agitated by the gas supplied to the tank from the bottom thereof to effect the contact of the liquid with the gas. In the above aeration and agitation tank, the tank is divided with perforated plates 3 along axial direction to form plural partitioned chambers 2. Each partitioned chamber 2 is furnished with an inner cylinder 8 to form a thermal medium tank 14 between the inner cylinder 8 and the outer wall of the tank. A heat-transfer pipe 9 is inserted in the thermal medium tank 14 to use the heat- transfer pipe 9 as a liquid-circulation path connecting the partitioned chamber 2 to the thermal mediun tank 14. A plug flow effective for the reaction or fermentation can be formed by this apparatus, and the gas can be mixed sufficiently with the liquid to improve the reaction or fermentation efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an aerated stirring tank in which liquid supplied into the tank is agitated by gas supplied into the tank from the lower part of the tank and brought into contact with each other.

To explain the conventional aeration stirring tank with reference to FIG. 2, 1 is a tank main body, 3 is a perforated plate that partitions the inside of the tank main body 1 into a plurality of parts in the axial direction, and partitions 2 are formed between each, and 4 is a gas tank. A supply nozzle, 5 is a gas discharge nozzle, 6 is a liquid supply nozzle, and 7 is a liquid discharge nozzle. Gas is blown from the nozzle 4, and air bubbles of relatively small diameter are formed by the perforated plate 3 at the bottom of the tank body 1. become and rise. In addition, the upward flow of the bubbles stirs the liquid supplied from the nozzle 6,
They come into contact with each other and a reaction or fermentation takes place. Also, as the bubbles rise, they gradually come into contact and coalesce, becoming larger. If the bubbles become larger, the gas-liquid contact efficiency will decrease, so the bubbles are passed through the next stage porous plate 3 in order to reduce the bubble diameter again. By repeating this operation a plurality of times, a predetermined reaction or fermentation is carried out, and the gas exits from the nozzle 5 and the liquid exits from the nozzle 7.

In the aeration-stirring tank shown in FIG. 2, () mixing of the liquids in each partition chamber 2 is insufficient, resulting in uneven reaction or fermentation. () Reactions or fermentation often involve exothermic or endothermic heat, and heat transfer tubes are usually used to transfer or transfer heat.
In addition to being difficult to insert, this heat transfer tube had the disadvantage of poor heat transfer efficiency.

Another conventional example of an aeration stirring tank is shown in FIG. In the aeration stirring tank, an inner cylinder (draft tube) 8 is provided inside the tank body 1.
There is a perforated plate 3 at the lower part of the porous plate 3, and gas is blown into the lower part of the perforated plate 3 from a nozzle 4, and the perforated plate 3 turns the gas into relatively small-diameter bubbles, which rise inside the inner cylinder 8. The liquid supplied from the nozzle 6 is agitated by the upward flow of the bubbles and comes into contact with each other, causing a reaction or fermentation. The gas-liquid mixture in the inner cylinder 8 is naturally circulated due to the density difference between the inner cylinder 8 and the liquid containing some bubbles between the inner cylinder 8 and the tank body 1, and the reaction or fermentation is carried out again.

In this type of aerated stirring tank, plug flow has better reaction or fermentation efficiency, but the aerated stirring tank shown in FIG. () If the inner cylinder 8 becomes longer, air bubbles will coalesce at the top and become larger, reducing the reaction or fermentation efficiency, so it is necessary to insert the perforated plate 3 into the inner cylinder 8 in multiple stages. In this case, there was a drawback that the resistance to the rise of gas increased, resulting in poor circulation of the liquid.

The present invention eliminates the above-mentioned drawbacks, and is an aerated stirring tank in which the liquid supplied into the tank is stirred by gas supplied into the tank from the bottom of the tank and comes into contact with each other. partitioned into a plurality of partitioned chambers, an inner cylinder is disposed within each partitioned chamber, and a heat medium tank is formed between the inner cylinder and the outer wall of the tank,
It relates to an aeration stirring tank characterized in that a heat transfer tube is inserted into the heat transfer medium tank and the inside of the heat transfer tube is used as a liquid circulation path in the heat transfer medium tank communicating with the partition chamber, the purpose of which is as follows: The object of the present invention is to provide an improved aerated stirring tank which can form a plug flow effective for reaction or fermentation, and can sufficiently mix gas and liquid, thereby improving reaction or fermentation efficiency.

Next, the aeration stirring tank of the present invention will be explained using an embodiment shown in FIG. 1. 1 is a tank body of the aeration stirring tank;
3 is a perforated plate that partitions the inside of the tank body 1 in the axial direction to form a plurality of partitioned chambers 2; 4 is a gas supply nozzle; 5
is a gas discharge nozzle, 6 is a liquid supply nozzle, 7 is a liquid discharge nozzle, 8 is an inner cylinder, 9 is a heat transfer tube, 10 is a guide ring, 11 is a tube plate, 12 is a heat medium supply nozzle, 13 is a heat medium discharge An inner tube (draft tube) 8 is disposed concentrically with the tank body 1 in each of the partitions 2, and a draft tube is provided between the outer wall surface of the inner tube 8 and the inner wall surface of the tank body 1. Tank body 1 via plate 11
A heat exchanger tube 9 fixed to is inserted. The perforation ratio of the perforated plate 3 is approximately 20%, and the diameter of the holes is approximately 10 to 30 mm. Also, the outer diameter of the entire perforated plate 3 is the diameter d of the inner cylinder 8.
A guide ring 10 is provided to make it slightly smaller than the perforated plate 3 and to make it easier for air bubbles to enter the inner cylinder 8 from the perforated plate 3. Also, the height of the partition chamber 2 is equal to the inner diameter of the tank body 1.
1.0 to 1.5 times is appropriate. Further, the inner diameter of the inner cylinder 8 is determined by the liquid circulation performance (liquid mixing performance) and the heat transfer area of the heat transfer tube 9. Gas is blown into the nozzle 4 at the bottom of the tank body 1, and then through the nozzle 5 at the top of the tank body 1.
The liquid is taken out from the nozzle 6 at the bottom of the tank body 1.
It is supplied from the tank body 1 and taken out from the nozzle 7 at the top of the tank body 1. On the other hand, the heat medium for cooling or heating enters through the nozzle 12, and the heat medium tank 1 outside the heat transfer tube 9
4 and is discharged from the nozzle 13.

Next, the function of the aeration stirring tank will be explained. The gas blown from the nozzle 4 at the bottom of the tank body 1 becomes relatively small bubbles by passing through the porous plate 3 at the lowest stage of the tank body 1, and is guided by the guide ring 10 into the inner cylinder 8. enters and rises inside the inner cylinder 8.
This upward flow of bubbles brings the liquid into contact with the bubbles,
A reaction or fermentation takes place. In the upper part of the inner cylinder 8, the bubbles come into contact with each other and coalesce, increasing the bubble diameter and deteriorating the gas-liquid contact efficiency, so the bubbles are guided again to the next stage porous plate 3 to reduce the bubble diameter. After repeating this operation several times, the gas is discharged from the nozzle 5 at the top of the tank body 1. On the other hand, among the liquids in the partition chamber 2, the gas-liquid mixed fluid in the inner cylinder 8 is drafted due to the density difference between the liquid in the inner cylinder 8 and the tank body 1, and heat is generated from inside the inner cylinder 8. Media tank 1
The mixture is naturally circulated from the inside of the heat transfer tube 9 of No. 4 to the inside of the inner cylinder 8, and is uniformly mixed. Further, as described above, small air bubbles are also involved in the liquid that enters the heat exchanger tube 9 from the inner cylinder 8 and descends inside the heat exchanger tube 9, so that reaction or fermentation is promoted at this time as well. Further, as described above, the liquid descending inside the heat transfer tube 9 transfers heat generated by reaction or fermentation to the heat transfer tube 9.
It is taken by the heat medium flowing outside the heat medium, and it is given by the heat medium. The liquid is supplied from a nozzle 6 and enters the partition chamber 2 at the bottom of the tank body 1.
Here, the first reaction or fermentation by gas-liquid contact is performed, and the liquid is continuously supplied from the nozzle 6 to enter the next partition chamber 2, and the second reaction or fermentation by gas-liquid contact is carried out. Fermentation takes place.
This operation is repeated thereafter, and the liquid is transferred to the tank body 1.
is discharged from the nozzle 7 at the top of the . In other words, the liquid supplied from the nozzle 6 flows in each partition chamber 2 in a piston flow manner, forming a plug flow effective for reaction or fermentation.

The present invention provides an aeration stirring tank in which the liquid supplied into the tank is agitated by gas supplied into the tank from the lower part of the tank and brought into contact with each other, and the inside of the tank is partitioned in the axial direction by a perforated plate to form a plurality of liquids. A partition chamber is formed, an inner cylinder is arranged in each partition chamber, a heat transfer medium tank is formed between the inner cylinder and the outer wall of the tank, and a heat transfer tube is inserted into the heat transfer medium tank. The inside of the heat tube is a liquid circulation path in the heat medium tank that communicates with the partitioned chamber, and it is possible to form a plug flow that is effective for reaction or fermentation, and also to sufficiently mix gas and liquid, increasing reaction or fermentation efficiency. It has an improved effect and is very useful for application in fermenters and other gas-liquid contact devices.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing an embodiment of the aeration stirring tank according to the present invention, FIG. 2 is a longitudinal side view showing a conventional aeration stirring tank, and FIG. 3 is a longitudinal side view showing another conventional example. be. 1... Tank body, 2... Partition chamber, 3... Perforated plate,
8... Inner cylinder, 9... Heat exchanger tube, 14... Heat medium tank.

Claims (1)

[Claims] 1. In an aeration stirring tank in which the liquid supplied into the tank is stirred by gas supplied into the tank from the lower part of the tank and brought into contact with each other, the inside of the tank is partitioned in the axial direction by a perforated plate to form a plurality of partitioned chambers, An inner cylinder is arranged in each of the partition chambers to form a heat medium tank between the inner cylinder and the outer wall of the tank, and a heat transfer tube is inserted into the heat medium tank so that the inside of the heat transfer tube is connected to the partition chamber. An aeration stirring tank characterized by having a liquid circulation path in the heat medium tank that communicates with the heat medium tank.