SU1002352A1 - Froth suppressing device - Google Patents

Description

(54) DEVICE FOR FOAMING

The invention relates to equipment for conducting technological processes in chemical, medical and other related fields of industry, accompanied by abundant foam formation and requiring its destruction, namely, mechanical devices for the continuous destruction of churning apparatus. .

A device for the destruction of foam in apparatuses, a cylindrical body with a package of inserts for the supply of foam and the removal of gas and liquid, is known. The nozzle for the supply is made in the form of a cylindrical channel, inside of which is placed a hollow cone with screw turns fixed on it

Foam, falling from the apparatus into the inlet pipe of the device, rises up, acquiring a rotational motion. Along the screw line of the screw. Inside the body, foam under the action of centrifugal forces and excess pressure falls on a package of inserts on which it is mechanically destroyed 1 3.

However, such a device is ineffective. For the destruction of fine fine foam, since

The turns of the foam supply pipe achieve significant radial velocities necessary for the effective destruction of the foam when it strikes the stack of inserts.

Also known is a mechanical antifoam consisting of a cidin-conical casing located around a rotating shaft, an impeller, a gesture 10 bonded to the shaft and the inner surface of the upper cylindrical part of the casing, and a stepped cone attached to the bottom of the shaft and installed inside the conical

15 parts of casing 2.

By rotating the shaft and hardened on it. the antifoam impeller creates air flow by sucking the foam into the internal cavity of the casing, where it

20 partially quenched. The main part of the foam passes through. Holes in the stepped cone and falls on the inner surface of the conical part of the casing. As a result, the foam is separated.

25 on liquid and gas. Gas escapes through the holes between the blades of the impeller and is removed from the apparatus through the nozzle in the apparatus lid, and the liquid from the inner surface of the plates is discharged into the apparatus. The disadvantage of the defoaming agent is its low efficiency at high gas consumption, therefore, significant foam flows, since the strong foam flow thrown from the cone to the inner surface of the casing does not have time to completely break down and dampens the subsequent portions of the foam. The force with which the foam strikes the reflector, the function of which is performed by the inner surface of the casing, is not sufficient to destroy the resistant foam. In addition, a strong foaming may result in the flow of foam around the antifoam agent and its penetration into the nozzle for removal of gas, which leads to the release of foam from the apparatus. The closest technical solution to the invention is a defoaming device containing a vertical; cylindrical body having on. the lower end of the foam inlet and installed under the gas outlet in the apparatus for growing microorganisms; and the defoaming element housed in the housing, consisting of blades mounted on the drive shaft. A disadvantage of the known defoaming device is that with increasing foam resistance or the velocity of air passing through the casing as a whole, the device does not work reliably. Defoaming depends on the magnitude of the force of mechanical shock of the current on the flow of the foam. With increasing foam resistance (which is typical for individual stages of microbiological processes), it is necessary to increase the impact force of the blades in order to maintain the efficiency of foam destruction at a given level, which is possible only with an increase in the angular velocity of the shaft. But since the rotational speed of the shaft remains unchanged during operation, it means that the force of the impact is unchanged. Consequently, with an increase in the resistance of the foam, its incomplete destruction occurs, which leads to the penetration of foam into the space of the foam absorber case over the blades and release of the product from the apparatus. The purpose of the invention is to ensure reliable operation and to prevent the release of foam from the microorganism growing apparatus. To do this, in the foam anchor device, which contains a vertical cylindrical body, has an foam inlet at the lower end and is installed under the gas outlet pipe in the microorganism growing apparatus, and the defoaming element placed in the case, the antifoaming element is designed as a screw, The turns of which are attached to the inner surface of the housing, wherein the housing with the screw is mounted for rotation in the direction coinciding with the direction of winding of the turns of the screw. The drawing schematically shows the proposed device, a longitudinal section. A defoaming device containing a vertical cylindrical body 1, having an inlet for foam at the bottom end and installed under the gas outlet pipe 2 in the microorganism growing apparatus 3, and an antifoaming element placed in the case, made in the form of a screw 4, the turns of which are attached to inner surface of the housing and. to the shaft 5. The housing with the screw is rotatably mounted in the direction coinciding with the winding direction of the auger turns. An annular seal 7 is installed on the upper flange 6 of the housing, which serves to prevent foam from entering the housing through the upper end. The shaft 5 is driven in rotation by an electric actuator 8. A device for defoaming works as follows. During aeration of the apparatus, the foam is entrained by the gas coming out of the apparatus and enters the screw channel of the housing 1, and due to the continuous supply of turns of the screw 4 to the foam flow, it is as if pushed out of the device. The coils exert dynamic pressure on the foam, which leads to its compaction in the channel and the destruction of the bubbles. Gas is pressed through the screw channel and exits the apparatus through the gas outlet pipe 2. Liquid droplets formed during the destruction of foam bubbles and captured by the gas are dropped to the casing wall by centrifugal forces and then the screw turns down to the inlet section of the device. The annular seal 7 prevents the foam from passing to the gas outlet pipe through the gap between the flange 6 of the housing 1 and the surface of the lid 9. The device for defoaming in the manner described above ensures its reliable operation, which will allow its use in processes accompanied by the formation of abundant resistant foam and high costs gas. The versatility and simplicity of the design offered by the device will significantly reduce the cost of its manufacture. Indeed, if in known defoaming agents to increase the effectiveness of defoaming or to provide the possibility of maintaining a different amount of those. technological processes, it is necessary to change the electric drive or foam-ruining elements, then the proposed device with a sufficient amount of vit

Claims (1)

The claims of $ A defoaming device comprising a vertical cylindrical body having a foam inlet at the lower end and mounted "0 under the gas outlet in the apparatus for growing microorganisms, and an antifoam element located in the housing, as follows the fact that, in order to ensure the reliability of operation 15 and to prevent the ejection of foam from the apparatus for growing microorganisms, the defoaming element is made in the form of a screw, the turns of which are attached to the inner surface of the housing, while the housing is equipped with a screw m installed with the possibility of rotation in the direction coinciding with the direction of winding the turns of the screw.