SU889698A1 - Foam-damping device - Google Patents

Description

one

The invention relates to equipment for the microbiological industry and can be applied in enzymes 1X for the cultivation of aerobic microorganisms under non-sterile conditions.

A device for quenching a foam is known, which is set up in open containers for fermentation or the cultivation of microorganisms. This device consists of a receiving socket located above the surface of the foaming liquid and a connected injector that serves to suck up and destroy foam. However, when using such a device, the liquid droplets are carried away with the working medium with air that has a high velocity at the injector exit.

The closest to the proposed technical essence and the achieved result is a device for extinguishing foam, mainly to unpressurized apparatuses for. the cultivation of microorganisms, which contains a socket with a socket placed in the housing of the apparatus for foam collection, a gas-jet injector connected with a cyclone, which provides additional damping of the foam in the field of centrifugal forces and separation of liquid droplets from the air 12,

The drawback of the device is that the limited capacity of the destroyed foam due to its incomplete hygoenia and the occurrence of transverse hydrodynamic irregularity in the gas-jet large-diameter injector does not allow using this device in large-unit large-capacity enzymes, where a significant amount

15 foam. In addition, this device is characterized by a high specific consumption of the ejecting gas per unit volume of foam to be divided into initial phases.

20

The purpose of the invention is to increase the productivity and reduce the specific consumption of the ejecting gas.

This goal is achieved by the fact that a device containing a branch pipe with a socket for foaming, a gas-jet injector connected to a cyclone; it is equipped with a gas distribution chamber located inside the foaming pipe and

additional injectors with cyclones; in this case, the gas-emitting nozzles of the injectors are connected to the indicated chamber, and the cyclones are placed inside the body of the apparatus with an assumed level of the culture fluid.

FIG. 1 shows the proposed device, general view, longitudinal section; in fig. 2 shows section A-A in FIG. 1 (top view).

The device is placed in the upper part of the housing of the apparatus 1, equipped with an aerator 2 for supplying process air to the layer of the fermentation medium.

The device includes a socket 3 for collecting foam with a nozzle 4, inside of which a gas distribution chamber 5 is located centrally with gas injection nozzles and injectors connected to it. The conical receiving chambers 7 of the injectors are installed coaxially with the nozzles on the nozzle 4, passing into the injection mixing chambers 8 tangentially connected to the cyclones 9 located inside the housing of the apparatus 1 above the culture fluid.

The device works as follows.

When the foam reaches the socket level 3, compressed air is supplied to the gas distribution chamber 5. When compressed air leaves the gas supplying b in the receiving chambers 7, a vacuum is created, under the action of which the foam is sucked into the pipe 4 through the socket 3. From the pipe 4, the foam enters the receiving chambers 7, where under the influence of the dynamic pressure of the air flowing out of the nozzles b, disintegrates. In the mixing chambers 8, the gas-liquid stream is exfoliated, while the liquid is pushed aside to the walls, and the gas, together with the drop of liquid, takes up the core of the stream. The separation of liquid from gas occurs in cyclones 9 due to the action of centrifugal forces. Gas from the cyclones escapes into the atmosphere, and the watered liquid from the conical part of the cyclones is supplied in the form of jets and droplets into the foam layer between the socket 3 and the body of the apparatus. The liquid flowing from cyclones, due to its kinetic energy, cuts off and quenches the foam that has not penetrated into the socket.

The presence of a gas distribution chamber and a number of additional injectors of optimal design significantly improves the performance of the device while maintaining a high degree of foam separation, which makes it possible to use it in large-unit power enzymes. For example, using an injector with a .30 mm mixing chamber for extinguishing foam with the specific flow rate of the ejecting gas is 1 and the flow rate in the mixing chamber in the order of 100 m / s. The capacity of the device is 125 m of foam per hour. In order to separate more foam, it is necessary to increase the diameter of the mixing chamber, which leads to pressure pulsations due to transverse hydrodynamic unevenness, incomplete foam separation and a decrease in the efficiency of the device. The use of the device of the proposed design eliminates these disadvantages.

For example, to extinguish foam in an amount of 2000 m per hour, it is sufficient to connect 16 injectors with mixing chambers with a diameter of 30 mm to the gas distribution chamber, which will ensure the operation of a 11 m diameter fermenter. in the area between the socket and the wall of the apparatus, thereby reducing the load on the injectors, which leads to a decrease in the flow rate of the ejecting gas, a decrease in the number of injectors at a constant diameter and whether to reduce the diameter of the injectors with a constant number of them. For example, placing cyclones with a diameter of 0.5 m in a fermenter case with a diameter of 11 m reduces the zone of action of the injectors by 30%, respectively, the flow rate of the ejecting gas decreases from 2000 to 1400 m per hour and its specific consumption per unit of foam to be destroyed decreases from 1.6 0.7.

Claims (2)

1. USSR author's certificate number 42012, cl. From 12 to 1/18, 1935. . 2. USSR author's certificate 391164, cl. C 12, B 1/18, 1973. (Prototype).