SU1764686A2 - Device for stirring and aeration of liquid - Google Patents

Abstract

SUMMARY OF THE INVENTION: The device comprises an annular nozzle formed by conical plates, inside of which a gas chamber is placed. Radial vanes and liquid flow dividers, tubular manifolds with slotted openings are placed around the outlet of the gas chamber. The annular nozzle is provided with radial blades having the shape of a triangular pyramid with two equal side edges forming an acute angle between them. The blades are attached to the periphery of the inner surfaces of the conical plates. The presence of the mentioned blades leads to additional turbulence in the flow and an increase in the mass transfer characteristics of the device. 5 il.

Description

The invention relates to devices for mixing and aerating a liquid and can be used in the chemical, food, microbiological and other sectors of the industry.

A device for mixing and aerating a liquid is known, which contains plates installed to form an annular nozzle and a gas turbine with a gap between them.

However, the known device is distinguished by insufficient gas dispersion and a weak renewal of the contact surface of the phases, which reduces the performance of mass transfer devices.

The closest to the described device to the technical essence and the achieved positive effect is a device for mixing and aeration of the liquid, consisting of conical plates installed to form an annular nozzle, between which is placed

a gas chamber with an annular outlet orifice, radial vanes and liquid flow dividers and provided with tubular manifolds having slotted holes arranged around the annular outlet aperture of the gas chamber and connected by nozzles with the internal cavity of the gas chamber.

However, due to the liquid slipping along the inner surface of the conical plates and the weak effect of this liquid on the dispersion of air, this device has an insufficiently high mass transfer characteristic.

The purpose of the invention is to increase the mass transfer characteristics of the device by additional turbulence in the fluid flow and improved air dispersion.

For this purpose, in a device for mixing and aeration of a liquid in an annular nozzle on the inner surface of conical TACO

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The blade is radially in the direction of the fluid flow, the blades are fixed in the shape of an irregular triangular pyramid with two equal lateral edges forming an acute angle between them, with the tips of the blades facing each other.

FIG. 1 shows the proposed device, a vertical section; in fig. 2 - the same, top view; in fig. 3 shows the node I in FIG. 2; FIG. 4 is a view along arrow A in FIG. 3; in fig. 5 is a view along arrow B in FIG. 3

The device for mixing and aerating the fluid consists of conical plates 1 and 2 installed to form an annular nozzle 3, between which a gas chamber 4 with an outlet annular opening 5, radial vanes 6, flow dividers 7 and tubular collectors 8 having slotted holes 9 are placed. Tubular collectors 8 are placed around the outlet annular opening 5 of the gas chamber 4 and connected by nozzles 10 with the internal cavity of the gas chamber 4. In the annular nozzle 3 on the periphery of the internal surfaces of the conical plates 1 and 2 radially in the direction of fluid flow, the blades 11 are fixed in the shape of a triangular pyramid with two equal lateral faces forming an acute angle between them, with the tops of the blades facing each other.

A device for mixing and aerating the liquid works as follows.

The device is rotated. The fluid entering the cavity between the conical plates 1 and 2 is ejected by the radial blades b in the direction of the annular nozzle 3. Passing through the channels formed by the dividers 7, the fluid flow ejects air from the gas chamber 4 through the gaps in the annular outlet 5 between the walls of the chamber 4 and tubular manifolds 8. The resulting liquid flow, flowing around tubular manifolds 8, further ejects gas from the gas chamber 4 through nozzles 10 and slotted openings 9 in the manifolds. Next, the gas-liquid flow enters the annular nozzle, passes between the blades, narrows and is ejected from the device evenly around the circumference. Due to the fact that in the annular nozzle there is a distribution of velocities along the vertical with large velocity gradients at the inner surfaces of the conical plates, the flows converging from the blades in the radial

the direction is vigorously mixed. In this case, the contact surface of the phases increases due to the creation of additional shear deformations of the fluid layers and, as a result, the efficiency of aeration of the fluid increases.

The presence of blades in the form of an irregular triangular pyramid will allow additional turbulization of the flow and provide higher liquid velocities at the inner surfaces of conical bridges. This will improve the dispersion of air due to the hydrodynamic effect of the liquid sliding at the inner surfaces of the conical plates on the main flow.

and, therefore, increase the mass transfer characteristics of the device.

Claims (1)

The invention The device for mixing and aeration of the fluid according to ed. No. 1430085, distinguished by the fact that, in order to improve the mass transfer characteristics, it is equipped with blades in the shape of an irregular triangular pyramid with two equal side edges forming an acute angle between them radially in the annular nozzle on the periphery of the inner surfaces of the conical plates, with the tops of the blades facing one another. 8 Yu Figz /Dus.5 Figs Compiled by A. David Nts Editor M.Samerkhanova Tehred M. MorgenCorrector N.Korol Order 3329 Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. 1764686 /Dus.5