SU1745280A1 - Rotary climbing-film evaporator - Google Patents

Abstract

Use: in the microbiological, food, medical, chemical and other industries of the industry. SUMMARY OF THE INVENTION: The annapat rotary film evaporator comprises a vertical housing with a heat exchange jacket, a rotor, and a solution distributor. In the heat exchange jacket, the perforated shell is concentrically mounted with a gap to the walls of the body and jacket. The shell forms an annular chamber with the wall of the heat exchange jacket. Steam entering under the pressure in the annular chamber passes through the holes in the shell and flows in the form of jets onto the heat transfer surface of the body, increasing the heat transfer coefficient from the steam to the heat transfer surface. Intensification of heat transfer is observed at a ratio of the distance from the shell to the heat transfer surface to the diameter of the holes, equal to 3-9. 3 il. sl C

Description

The invention relates to the field of evaporation equipment, in particular to apparatus of the film type, and can be used in the microbiological, food, medical, chemical and other industries of the industry.

Heat exchangers for the treatment of liquid products with heat-exchange coats in the form of a coil are known.

However, low values of heat transfer coefficients are distinguished due to insignificant turbulization of the liquid flow moving in them.

The closest in technical essence to the present invention is a rotary film evaporator, containing

vertical housing with a heat exchange jacket, rotor, solution distributor and process connections.

The disadvantages of apparatus of this design should also include insufficiently high values of heat transfer coefficients from steam to the heat transfer surface due to the presence of a thin layer of inert gas near this surface, which creates thermal resistance and prevents heat transfer.

The aim of the invention is to increase the productivity of the apparatus by increasing the heat transfer coefficient.

The goal is achieved by the fact that in a known apparatus containing verti2

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The shaft housing with a heat exchange jacket, rotor, solution distributor and process connections, the heat exchange jacket is equipped with a concentrically mounted perforated shell, forming an annular chamber with the wall of the heat exchange jacket.

FIG. 1 schematically shows a rotary film evaporator; in fig. 2 — node I in FIG. one; in fig. 3 is a graph of heat transfer coefficient as a function of the ratio of the distance from the shell to the heat transfer surface of the housing to the diameter of the holes of the shell.

The rotary film evaporation apparatus contains a vertical body 1 with a heat exchange jacket 2, a separator 3, a rotor, a solution distributor 5. In the heat exchange jacket concentric with a gap to the walls of the body and shirt, a shell 6 is formed, which forms an annular ring with the wall of the heat exchange shirt 2 chamber 7. On the surface of the shell there are holes 8. In the evaporator apparatus there are nozzles: 9 for injecting the treated solution, 10 for evaporating the solvent, 11 for evacuating the secondary steam, and also nozzles 12 and 13 for introducing the steam into the heat exchange shirt and output therefrom condensate.

The device works as follows.

The evaporated solution is fed into the apparatus through the nozzle 9 and with the help of a rotating rotor 4 is distributed as a film flowing down along the inner surface of the housing 1. The surface of the housing is heated by steam supplied under pressure to the heat exchange jacket 2 through the pipe 12. As the solution flows down.

heats and vaporizes. One stripped off solution is withdrawn from the apparatus through the nozzle 10. The resulting secondary steam passes through the separator 3 and is withdrawn through the nozzle 11. The steam supplied under pressure into the annular chamber 7 passes through, the holes in the shell of the jets form the jets on the heat transfer surface, turbulizer and destruction This is a thin layer of inert gas at the heat transfer surface.

Claims (1)

The proposed technical solution allows to significantly increase the degree of turbulence in the flow of heat transfer fluid, eliminate the layer of inert rasai in the border area and thereby increase the coefficient of heat transfer from the steam to the heat transfer surface. The ratio of the geometric parameters b / d has a significant effect on the heat transfer coefficient, where b is the distance from the shell to the heat transfer surface, d is the diameter of the holes in the shell. A spasmodic increase in the heat transfer coefficient is observed with the ratio b / d 3-9. Claims of the invention A rotary film evaporator comprising a vertical housing with a heat exchange jacket, a rotor, a solution dispenser and process connections, characterized in that, in order to improve the performance of the apparatus by increasing the heat transfer coefficient, the heat exchange jacket is provided with a perforated shell that is installed concentrically with the clearance to the walls of the housing and shirts, and the ratio of the distance from the shell to the body to the diameter of the holes of the shell is 3-9. but 0829Ш I "  / L dc / np cC0 6 5 4 J 2 I 2 N4