SU1239483A1 - Method of cooling and freezing liquid and paste-like media - Google Patents

Description

The invention relates to the food industry, in particular to methods for cooling and freezing liquid and pasty media by direct contact with a refrigerant, and can be used in other industries as long as the medium to be cooled does not chemically interact with the refrigerant.

The purpose of the invention is to reduce energy consumption, ensure uniform cooling and freezing of the medium, reducing refrigerant loss.

The drawing shows an installation diagram for implementing the method.

The method is carried out in the following manner.

The environment to be cooled is from. the tank 1 through line 2 supply of the cooled medium with the valve 3 open with the dosing pump 4 through the check valve 5 is fed into the mixing vessel 6, into which simultaneously

from tank 7 via supply line 8 to 25, 23 through pipeline 24 with open

a draining pump 9 through the non-return valve 10 serves liquid refrigerant.

After mixing the medium with the liquid refrigerant mixture through line 11

3 open valve 12 and the throttle nozzle 13 is served in the separation vessel 14, which is a gas pipeline

15: connected through a separator to a “plant for the production of cold.

The outflow of the mixture after the throttle nozzle 13 in the separation vessel 14 is accompanied by boiling of the refrigerant.

as a result of a sharp drop in pressure and the perception of heat from the medium, which during this process is instantaneously cooled.

When the upper level of the liquid in the separation vessel 14 is reached, the solenoid valve 16 opens and the cooled medium through lines 15 and 17 through the open valve 8 is supplied to the isothermal vessel 19, and when it falls to the lower level, the solenoid valve 16 is closed. The valves 20 and 21 are closed during the cooling process.

Similarly, the release of the pasty medium from the separating vessel 14 is effected even after partial freezing of a part of the liquid, since in this paste-like medium the food thickens to a greater extent and

239483.

separation of the smallest particles of ice from the environment is not possible. When freezing the liquid medium after throttling the mixture in the separation vessel 14 from the gas-liquid medium, 10–30% of ice particles are formed in the amount of ice, which create a layer of loose ice above the upper level of the liquid.

10 Crushed ice from separation vessel 14 is carried by a stream of gaseous refrigerant through a gas line, 22 to a separator, from which ice is removed from the plant, and gaseous

15 the refrigerant enters the plant for the production of cold when it is reduced again.

The unfrozen medium is fed through a solenoid valve 16 and a valve 20 by a rotary dosing pump 4 for mixing and freezing.

To continuously replenish the amount of liquid due to partial freezing by the dosing pump

valve 21 is pumping the medium from reservoir 1 in an amount corresponding to the amount of the frozen medium, for example 10-30%.

During the freezing period, branches 3 and 18 are closed.

Example 1. For processing 10 m / h of strong wine (Madera) from 2 to minus 9 C, it is fed from reservoir 1 with open valve 3 by metering pump 4 through line 2 through the check valve 5 to mixing vessel 6, into which At the same time, 1.8 m / h of liquid carbon dioxide is supplied from the tank 7 through the supply line 8 by the dosing pump 9 through the check valve 10.

The pressure of the mixture / (wine-liquid carbonic acid) in the mixing vessel 6 is determined by the pressure of the liquid carbonic acid, 33 ata, which corresponds to the saturation temperature at the wine temperature of 2 ° C, which is being mixed.

The mixture from the mixing vessel 5 through the pipeline 11 through the open valve 12 and the throttle nozzle 13 is fed to the separation vessel 14, the pressure in which is maintained at 23.3 atmospheres, which corresponds to the boiling point of carbon dioxide at minus 15 C.

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The gaseous carbon dioxide from separation vessel 14 is drawn off via a gas line 22, a separator into a cold production plant in which the refrigerant is re-liquefied.

Wine cooled to the cryoscopic temperature (), from separation vessel 14, is discharged through pipelines 15 and 17 through a solenoid valve 16 and valve 18 to an isothermal container 19 for clarification. from tartaric salts and coagulative pectin substances.

PRI me R. 2. For production in the stream of 7 t / h of ice cream (dairy) with cooling the mixture of the product. From 4 to minus. The frozen mixture from tank 1 and liquid carbon dioxide in the amount of 3574 kg / h from tank 7 are fed to the mixing vessel biv separation vessel 14 according to the scheme described in example 1. The pressure of the mixture (milk mixture and liquid carbon dioxide) in the mixing vessel 6 is 40 ATA, and the maintained pressure of carbon dioxide in the separation vessel 14 is 27 ATA, which corresponds to a boiling point of carbon dioxide equal to -10 C.

Ice cream preparation according to the proposed method should be carried out according to the technology described for cooling and freezing pasty media.

EXAMPLE 3: For the production of 5 tons / h of Technical Ice from the separation vessel 14, pipelines 15, 25 and 24 with the solenoid valve 16 open and valve 20 by the dosing pump 4, water in an amount of 20 is fed into a mixing vessel 6, into which simultaneously from. tank 7 through line 8 supply metering pump 9 serves freon-12 (freon-12) in

. Using the proposed method, in the course of moderate boiling temperatures of the refrigerant (), to ensure fast and regular cooling or freezing of food products with minimal energy costs, to ensure the continuity of cooling or partial freezing processes, by simple means to automate production, reduce

the amount of 1,230 t / h. The pressure of the mixture .45 the labor intensity and cost of cooling the mixing vessel 6 is

Compiled by E.Novikova Editor N.Tupitsa Tehred O.Gortvay

Order 3382/38 Circulation 482. Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, UzhhorrD, Proektna str., 4

20

five

5 30

35 40

3.81 ata, which corresponds to refrigerant-12 pressure at saturation temperature.

From the mixing vessel 6, the mixture (refrigerant-12 - water) is supplied through conduit 11 through valve 12 and throttle nozzle 13 to separation vessel 14, in which as a result of a sharp drop in pressure to 2.66 atm. , part of the water (25%) is frozen into a grit that floats on water .. As a result of the refrigerant boiling, an amount of 81 vapor forms, which is used to transport ice to the grit through a gas line 22 to a separator, from which, after separation from carbon dioxide, ice is removed from installations, and gaseous the refrigerant is discharged to the liquefaction plant for producing cold.

The water from the separating vessel 14 when re-dosing pump 4 is fed to the mixing and freezing.

In order to replenish the water in the installation, due to the partial freezing of the dosing pump 23, the pipeline 24, with the valve 21 open, pumped water in an amount of 5 m / h, the temperature of which was conditionally accepted at 20 ° C. .

. Using the proposed method, in the course of time, at moderate boiling temperatures of the refrigerant (), to ensure fast and uniform cooling or freezing of food products with minimal energy expenditure, to ensure the continuity of the cooling or partial freezing processes;

.45 labor input and cost of chilled or frozen products.

Proofreader V. Booth ha

Claims (1)

1. METHOD FOR COOLING AND FREEZING LIQUID AND PASTE. MEDIUM, including mixing the medium with a liquid refrigerant, characterized in that · in order to reduce energy consumption and ensure uniform cooling and freezing of the medium, the mixing is carried out while dosing a liquid or paste-like medium and liquid refrigerant, then the resulting mixture is throttled, and gaseous refrigerant is separated from the medium. ^ 2. The method according to claim 1, about t and h and u. and the fact that the throttling of the mixture is carried out to a pressure corresponding to the boiling point of the refrigerant 3-10 below the final temperature of the medium. ke C © 00.